NET2PHONE INC
S-1/A, 1999-06-28
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>


   As filed with the Securities and Exchange Commission on June 28, 1999

                                                 Registration No. 333-78713

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                --------------

                              AMENDMENT NO.1

                                    TO
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                                --------------

                                Net2Phone, Inc.
             (Exact name of registrant as specified in its charter)

<TABLE>
<CAPTION>
            Delaware                              4813                            22-3559037
<S>                                <C>                                <C>
 (State or other jurisdiction of      (Primary Standard Industrial             (I.R.S. Employer
  incorporation or organization)      Classification Code Number)            Identification No.)
</TABLE>

                                171 Main Street
                          Hackensack, New Jersey 07601

                              (201) 907-5304
              (Address, including zip code, and telephone number,
       including area code, of registrant's principal executive offices)

                                Howard S. Balter
                            Chief Executive Officer
                                Net2Phone, Inc.
                                171 Main Street
                          Hackensack, New Jersey 07601

                              (201) 907-5304
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                                --------------

                                   Copies to:
<TABLE>
<S>                                            <C>
           Ira A. Greenstein, Esq.                        Alexander D. Lynch, Esq.
            Morrison & Foerster LLP                        Kenneth R. McVay, Esq.
          1290 Avenue of the Americas                 Brobeck, Phleger & Harrison LLP
           New York, New York 10104                      1633 Broadway, 47th Floor
                (212) 468-8000                            New York, New York 10019
                                                               (212) 581-1600
</TABLE>

                                --------------

      Approximate date of commencement of the proposed sale to the public:
  As soon as practicable after this registration statement becomes effective.

  If any of the securities being registered on this form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [_]
  If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]
  If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
  If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box. [_]

                                --------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
- --------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------
<CAPTION>
 Title of Each Class of Securities   Proposed Maximum Aggregate       Amount of
         to be Registered                Offering Price(1)      Registration Fee(1)(2)
- --------------------------------------------------------------------------------------
 <S>                                 <C>                        <C>
 Common Stock, $.01 par value....           $66,240,000                $18,415
- --------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------
</TABLE>

(1) Estimated solely for the purpose of calculating the registration fee
    pursuant to Rule 457(o) under the Securities Act of 1933.

(2) $13,900 of this amount has been previously paid.

   We hereby amend the registration statement on such date or dates as may be
necessary to delay its effective date until we shall file a further amendment
which specifically states that the registration statement shall thereafter
become effective in accordance with Section 8(a) of the Securities Act of 1933
or until the registration statement shall become effective on such date as the
Securities and Exchange Commission, acting pursuant to said Section 8(a), may
determine.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+The information in this prospectus is not complete and may be changed. We may +
+not sell these securities until the registration statement filed with the     +
+Securities and Exchange Commission is effective. This prospectus is not an    +
+offer to sell these securities and it is not soliciting an offer to buy these +
+securities in any state where the offer or sale is not permitted.             +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                SUBJECT TO COMPLETION, DATED JUNE 28, 1999

PROSPECTUS

                             4,800,000 Shares

                                  Common Stock

  This is an initial public offering of common stock by Net2Phone, Inc.
Net2Phone is selling 4,800,000 shares of common stock. The estimated initial
public offering price is between $10.00 and $12.00 per share.

                                   --------

  At the request of Net2Phone, the underwriters intend to reserve at the
initial offering price up to 300,000 shares of common stock to be sold in this
offering to National Broadcasting Company, Inc.

  We have applied for listing of Net2Phone's common stock on the Nasdaq
National Market under the symbol NTOP.

                                   --------

<TABLE>
<CAPTION>
                                                                 Per Share Total
                                                                 --------- -----
<S>                                                              <C>       <C>
Initial public offering price...................................    $       $
Underwriting discounts and commissions..........................    $       $
Proceeds to Net2Phone, before expenses..........................    $       $
</TABLE>

  Net2Phone has granted the underwriters an option for a period of 30 days to
purchase up to 720,000 additional shares of our common stock.

                                   --------

         Investing in the common stock involves a high degree of risk.

                  See "Risk Factors" beginning on page 4.

                                   --------

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is
a criminal offense.



Hambrecht & Quist                                                 BT Alex. Brown

                                   --------

                            Bear, Stearns & Co. Inc.

        , 1999
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
     <S>                                                                   <C>
     Prospectus Summary...................................................   1
     Risk Factors.........................................................   4
     Forward-Looking Statements...........................................  12
     Use of Proceeds......................................................  13
     Dividend Policy......................................................  13
     Capitalization.......................................................  14
     Dilution.............................................................  15
     Selected Financial Data..............................................  16
     Management's Discussion and Analysis of
      Financial Condition and Results of Operations.......................  17
     Business.............................................................  26
     Management...........................................................  43
     Principal Stockholders...............................................  51
     Certain Transactions.................................................  53
     Description of Capital Stock.........................................  60
     Shares Eligible for Future Sale......................................  63
     Underwriting.........................................................  65
     Legal Matters........................................................  68
     Experts..............................................................  68
     Where You Can Find More Information..................................  68
     Index to Financial Statements ....................................... F-1
</TABLE>

   We maintain Web sites at www.Net2Phone.com and www.EZSurf.com. Information
contained on our Web sites does not constitute part of this prospectus.

   "Net2Phone" and "Net2Fax" are our registered marks. Applications to register
the service marks "Phone2Phone," "Click2Talk," "N2P," "Net2Phone Pro" and
"Fax2Fax" have been filed with the United States Patent and Trademark Office.
This prospectus also includes references to registered service marks and
trademarks of other entities.
<PAGE>


                               PROSPECTUS SUMMARY

   This summary highlights selected information contained elsewhere in this
prospectus. This summary may not contain all of the information that you should
consider before investing in our common stock. You should read the entire
prospectus carefully, including "Risk Factors" and the financial statements,
before making an investment decision.

                                   Net2Phone

   Net2Phone is a leading provider of services enabling users to make high
quality, low-cost telephone calls over the Internet. These services are
commonly referred to as Internet telephony. Our Internet telephony services
enable our customers to call individuals and businesses worldwide using their
personal computers or traditional telephones. According to Frost & Sullivan, a
leading market research firm, we were the largest provider of Internet calls in
the world in 1997 with a 30% market share.

   In August 1996, we introduced our first service, "PC2Phone." We believe that
PC2Phone was the first commercial telephone service to connect calls between
personal computers and telephones over the Internet. In September 1997, we
introduced "Phone2Phone," a service that enables international and domestic
calls to be made over the Internet using traditional telephones. Our customers
often pay substantially less for long-distance calls they make using our
services than they would for calls made over traditional long distance
networks, such as those owned by AT&T, Sprint and MCI.

   We are leveraging our expertise in Internet telephony to integrate live
voice capabilities into the Web. We have developed simple, easy to use PC2Phone
software that operates on a personal computer and allows individuals and
businesses to:

  .  speak with sales or customer service representatives of online retailers
     and other Web-based businesses while visiting their Web sites;

  .  speak with individuals or businesses listed on various online
     directories, such as Yahoo! People Search; and

  .  call almost any telephone number in the world.

  We promote our services through relationships with international resellers
and leading Internet companies. For example, our PC2Phone software will be
embedded on an exclusive basis into future versions of Netscape's Internet
browser, including Netscape Navigator and Netscape Communicator, for the term
of our agreement. Netscape will also include a Net2Phone icon on the Netscape
Navigator Personal Toolbar and integrate our services into Netscape Netcenter,
allowing Netscape users to access our services from anywhere on the Web.

   Our strategy for building on our leadership position in our market and
making live voice communication a common feature on the Internet includes the
following key elements:

  .  marketing our services widely;

  .  pursuing multiple sources of revenue;

  .  enhancing brand recognition;

  .  making our software readily available worldwide; and

  .  expanding and enhancing our products and services.

   Upon completion of this offering, IDT will own approximately 58.2% of our
outstanding capital stock. IDT owns Class A stock that has twice the voting
power of our common stock. As a result, IDT will control 65.2% of our vote.

   Our principal executive offices are located at 171 Main Street, Hackensack,
New Jersey 07601, and our telephone number at that address is (201) 907-5304.

                                       1
<PAGE>


                                  The Offering

<TABLE>
 <C>                                            <S>
 Common stock offered by Net2Phone............   4,800,000 shares
 Capital stock to be outstanding after this
  offering....................................  46,797,619 shares
  Common stock................................  10,161,429 shares
  Class A stock...............................  36,636,190 shares
 Use of proceeds..............................  $7.0 million of the net
                                                proceeds from this offering
                                                will be used to repay a portion
                                                of a note outstanding to IDT
                                                Corporation. $1.5 million will
                                                be paid to NBC for the purchase
                                                of television advertising. We
                                                have not made any other
                                                specific allocations with
                                                respect to the proceeds. We
                                                expect to use the balance of
                                                the proceeds: for developing
                                                and maintaining strategic
                                                Internet relationships; for
                                                advertising and promotion; for
                                                research and development; for
                                                upgrading and expanding our
                                                network; and for general
                                                corporate purposes, including
                                                working capital.
 Nasdaq National Market symbol................  NTOP
</TABLE>

                             --------------------

   This information excludes:

  .  3,666,366 shares subject to options outstanding as of June 25, 1999 at a
     weighted average exercise price of $3.33 per share; and

  .  6,030,378 shares reserved for issuance under our 1999 Stock Incentive
     Plan, as of June 25, 1999, approximately 2,011,000 of which we expect to
     grant prior to the closing of this offering.

Unless otherwise noted, the information in this prospectus:

  .  reflects a 10,320-for-one stock split, which took place in April 1999;

  .  reflects a three-for-one stock split on our common stock and Class A
     stock, which took place in June 1999;

  .  assumes 4,683,129 shares of common stock outstanding in June 1999;

  .  assumes 27,622,089 shares of Class A stock outstanding in June 1999;

  .  assumes the exercise of warrants to purchase 272,400 shares of our
     common stock at a price of $3.33 per share prior to the closing of this
     offering;

  .  gives effect to the conversion of 405,792 shares of Class A stock to
     common stock upon the transfer of these shares from IDT to Clifford M.
     Sobel, our Chairman and President, at the closing of this offering; and


  .  gives effect to the conversion of all 3,140,000 outstanding shares of
     our Series A convertible preferred stock into 9,420,000 shares of Class
     A stock at the closing of this offering.

   Each share of Class A stock entitles the holder to two votes, while holders
of our common stock are entitled to only one vote. Each share of Class A stock
is convertible into one share of common stock, and automatically converts into
common stock upon transfer.

                             --------------------

   Our fiscal year ends on July 31 of each calendar year. All references to
fiscal years in this prospectus refer to the fiscal years ending in the
indicated calendar years. For example, "fiscal 1998" refers to the fiscal year
ended July 31, 1998.


                                       2
<PAGE>


   The table below sets forth summary financial information for the periods
indicated. This information is not necessarily indicative of the results of
operations or financial position which would have resulted had we operated as
an independent entity during the periods indicated. It is important that you
read this information together with the section entitled "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
our financial statements and the notes thereto included elsewhere in this
prospectus.

                         Summary Financial Information

<TABLE>
<CAPTION>
                            Period from         Year Ended            Nine Months Ended
                          January 2, 1996        July 31,                 April 30,
                          (inception) to  ------------------------  -----------------------
                           July 31, 1996     1997         1998         1998        1999
                          --------------- -----------  -----------  ----------  -----------
<S>                       <C>             <C>          <C>          <C>         <C>
Statement of Operations:
  Revenue...............     $      --    $ 2,652,303  $12,005,972  $7,954,374  $22,203,257
  Loss from operations..      (507,758)    (1,697,647)  (3,544,689)   (673,922)  (2,905,966)
  Net loss..............     $(507,758)   $(1,697,647) $(3,544,689) $ (673,922) $(2,905,966)
  Net loss per share--
   basic and diluted....     $   (0.02)   $     (0.06) $     (0.12) $    (0.02) $     (0.09)
  Shares used in
   calculation of basic
   and diluted loss per
   share................    27,864,000     27,864,000   30,186,000  29,928,000   30,960,000
</TABLE>

   The pro forma balance sheet data summarized below gives effect to:

  .  the sale of 3,140,000 shares of Series A convertible preferred stock,
     which are convertible into 9,420,000 shares of our Class A common stock,
     and warrants to purchase 180,000 shares of our common stock in May 1999
     for net proceeds of $29.9 million;

  .  the conversion of all outstanding shares of our Series A convertible
     preferred stock into shares of our Class A stock at the closing of this
     offering;

  .  the issuance of warrants to purchase 92,400 shares of our common stock
     granted to the placement agent in May 1999 in connection with the sale
     of our Series A convertible preferred stock;

  .  the repayment of $8.0 million of the amounts owed to IDT in May 1999;
     and

  .  the exercise of options to purchase 1,345,219 shares of common stock in
     May 1999 in exchange for $3.1 million in promissory notes and $1.3
     million in cash.

   The pro forma as adjusted balance sheet summarized below reflects:

  .  the sale of 4,800,000 shares of common stock in this offering;

  .  the application of $7.0 million of the estimated net proceeds from this
     offering to pay a portion of the amounts due to IDT;

  .  the application of $1.5 million of the estimated net proceeds from this
     offering to pay NBC for television advertising time; and

  .  the exercise of warrants to purchase 272,400 shares of common stock
     prior to the closing of this offering.
<TABLE>
<CAPTION>
                                                     April 30, 1999
                                          --------------------------------------
                                                                     Pro Forma
                                             Actual      Pro Forma   As Adjusted
                                          ------------  ----------- ------------
<S>                                       <C>           <C>         <C>
Balance Sheet Data:
  Cash and cash equivalents.............. $  1,782,194  $25,016,264 $65,237,356
  Working capital........................  (17,255,452)  13,978,618  62,699,710
  Total assets...........................   19,818,328   43,052,398  84,773,490
  Due to IDT.............................   22,000,000   14,000,000   7,000,000
  Total stockholders' (deficit) equity...   (3,926,122)  27,307,948  76,029,040
</TABLE>


                                       3
<PAGE>

                                  RISK FACTORS

   You should carefully consider the risks described below before making an
investment decision. If any of the following risks actually occur, our
business, financial condition or results of operations could be materially
adversely affected. In that event, the trading price of our shares could
decline, and you may lose part or all of your investment.

        RISKS RELATED TO OUR FINANCIAL CONDITION AND BUSINESS MODEL

OUR LIMITED OPERATING HISTORY MAKES EVALUATING OUR BUSINESS DIFFICULT.

   We were formed as a subsidiary of IDT in October 1997. Prior to our
inception in January 1996, our business was conducted as a division of IDT.
Therefore, we have only a limited operating history with which you may evaluate
our business. You must consider the numerous risks and uncertainties an early
stage company like ours faces in the new and rapidly evolving market for
Internet-related services. These risks include our ability to:

  .  increase awareness of our brand and continue to build user loyalty;

  .  maintain our current, and develop new, strategic relationships;

  .  respond effectively to competitive pressures; and

  .  continue to develop and upgrade our network and technology.

   If we are unsuccessful in addressing these risks, our business, financial
condition and results of operations will be materially and adversely affected.


WE HAVE NEVER BEEN PROFITABLE AND EXPECT OUR LOSSES TO CONTINUE FOR THE
   FORESEEABLE FUTURE.

   We have never been profitable on an annual basis. We had an accumulated
deficit of approximately $8.7 million as of April 30, 1999. We expect to
continue to incur operating losses for the forseeable future. Our operating and
marketing expenses have continuously increased since inception and we expect
them to continue to increase significantly during the next several years.
Accordingly, we will need to generate significant revenue to achieve
profitability. We may not be able to do so. Even if we do achieve
profitability, we cannot assure you that we will be able to sustain or increase
profitability on a quarterly or annual basis in the future.

   Further, it is probable that we will have to recognize significant
additional charges relating to non-cash compensation in connection with options
that we granted in May 1999 and that we expect to grant prior to the closing of
this offering. See "Management's Discussion and Analysis of Financial Condition
and Results of Operations."

WE INTEND TO PURSUE MULTIPLE STREAMS OF REVENUE, MANY OF WHICH ARE UNPROVEN.

   In the future, we intend to pursue revenue from new Web-based opportunities,
such as banner and audio advertising, as well as from sponsorship opportunities
on our user interface and our EZSurf.com Internet shopping directory. We also
intend to explore the availability of revenue-sharing opportunities. We have
not attempted to generate this type of revenue before. We intend to devote
significant capital and resources to create these new revenue streams and we
cannot ensure that these investments will be profitable.

WE MAY HAVE DIFFICULTIES MANAGING OUR EXPANDING OPERATIONS, WHICH MAY REDUCE
   OUR CHANCES OF ACHIEVING PROFITABILITY.

   Our future performance will depend, in part, on our ability to manage our
growth effectively. To that end, we will have to undertake the following tasks,
among others:

  .  develop our operating, administrative, and financial and accounting
     systems and controls;

                                       4
<PAGE>

  .  improve coordination among our engineering, accounting, finance,
     marketing and operations personnel;

  .  enhance our management information systems capabilities; and

  .  hire and train additional qualified personnel.

We cannot assure you that we will be able to accomplish these tasks.


IF WE FAIL TO ESTABLISH AND MAINTAIN STRATEGIC RELATIONSHIPS OUR ABILITY TO
   INCREASE OUR SALES WOULD SUFFER.

   We currently have strategic relationships with Netscape, Compaq, Yahoo!,
Excite and others. We depend on these relationships to:

  .  distribute our products to potential customers;

  .  increase usage of our services;

  .  build brand awareness; and

  .  cooperatively market our products and services.

   We believe that our success depends, in part, on our ability to develop and
maintain strategic relationships with leading Internet companies and computer
hardware and software companies, as well as key marketing distribution
partners. If any of our strategic relationships are discontinued, sales of our
products and services and our ability to maintain or increase our customer base
may be substantially diminished.


WE DEPEND ON RESELLERS, WHOM WE DO NOT CONTROL, TO MARKET AND DISTRIBUTE OUR
   PRODUCTS AND SERVICES INTERNATIONALLY AND TO PROVIDE LOCAL CUSTOMER SUPPORT.

   If we hire a reseller who fails to market our products and services
effectively, we could lose market share. Additionally, if a reseller provides
poor customer service, we could lose brand equity. Therefore, we must maintain
and hire additional resellers throughout the world that are capable of
providing high-quality sales and service efforts. If we lose a reseller in a
key market, or if a current or future reseller fails to adequately provide
customer support, our reputation and business could be materially adversely
affected.

COMPETITION COULD REDUCE OUR MARKET SHARE AND DECREASE OUR REVENUE.

   The market for our services has been extremely competitive. Many companies
offer products and services like ours, and many of these companies have a
substantial presence in this market. Current product offerings include VocalTec
Communications' Internet Phone, QuarterDeck's WebPhone and Microsoft's
NetMeeting.

   In addition, a number of large telecommunications providers and equipment
manufacturers, such as Alcatel, Cisco, Lucent, Northern Telecom and Dialogic
(which has entered into an agreement to be acquired by Intel), have announced
that they intend to offer similar products. We expect these products to allow
live voice communications over the Internet between parties using a personal
computer and a telephone and between two parties using telephones. Cisco
Systems has also taken further steps by recently acquiring companies that
produce devices that help Internet service providers carry voice over the
Internet while maintaining traditional phone usage and infrastructure. Other
competitors of ours, such as ICG Communications, IPVoice.com, ITXC, RSL
Communications (through its Delta Three subsidiary) and VIP Calling, route
voice traffic worldwide over the Internet. In addition, major long distance
providers, such as AT&T, Deutsche Telekom, MCI WorldCom and Qwest
Communications, as well as other major companies such as Motorola and Intel,
have all entered or plan to enter the market for carrying voice over the
Internet. These companies are larger than we are and have substantially greater
financial, distribution and marketing resources than we do. We may not be able
to compete successfully in this market.

                                       5
<PAGE>


PRICING PRESSURES MAY LESSEN OUR COMPETITIVE PRICING ADVANTAGE.

   Our success is based on our ability to provide discounted domestic and
international long distance services by taking advantage of cost savings
achieved by carrying voice traffic over the Internet, as compared to carrying
calls over long distance networks, such as those owned by AT&T, Sprint and MCI.
In recent years, the price of long distance calls has fallen. In response, we
have lowered the price of our service offerings. The price of long distance
calls may decline to a point where we no longer have a price advantage over
these traditional long distance services. We would then have to rely on factors
other than price to differentiate our product and service offerings, which we
may not be able to do.

WE MAY NOT BE ABLE TO HIRE AND RETAIN THE PERSONNEL WE NEED TO SUSTAIN OUR
   BUSINESS.

   We depend on the continued services of our executive officers and other key
personnel. We have an employment agreement with only one of our executive
officers, Clifford M. Sobel, our Chairman and President. We need to attract and
retain other highly-skilled technical and managerial personnel for whom there
is intense competition. If we are unable to attract and retain qualified
technical and managerial personnel, our business, results of operations and
financial condition would be materially adversely affected.

IF OUR CUSTOMERS DO NOT PERCEIVE OUR SERVICE TO BE EFECTIVE OR OF HIGH
   QUALITY, OUR BRAND AND NAME RECOGNITION WOULD SUFFER.

   We believe that establishing and maintaining a brand and name recognition is
critical for attracting and expanding our targeted client base. We also believe
that the importance of reputation and name recognition will increase as
competition in our market increases. Promotion and enhancement of our name will
depend on the effectiveness of our marketing and advertising efforts and on our
success in continuing to provide high-quality products and services, neither of
which can be assured.

WE DEPEND ON OUR INTERNATIONAL OPERATIONS, WHICH SUBJECT US TO UNPREDICTABLE
   REGULATORY AND POLITICAL SITUATIONS.

   As of April 30, 1999, approximately 65% of our customers were based outside
of the United States, generating approximately 58% of our revenues during the
nine months ended on that date. A significant component of our strategy is to
continue to expand internationally. We cannot assure you that we will be
successful in expanding into additional international markets. In addition to
the uncertainty regarding our ability to generate revenue from foreign
operations and expand our international presence, there are certain risks
inherent in doing business on an international basis, including:

  .  changing regulatory requirements;

  .  increased bad debt and subscription fraud;

  .  legal uncertainty regarding liability, tariffs and other trade barriers;

  .  political instability; and

  .  potentially adverse tax consequences.

We cannot assure you that one or more of these factors will not materially
adversely affect our business, results of operations and financial condition.

ALL OF THE TELEPHONE CALLS MADE BY OUR CUSTOMERS ARE CONNECTED THROUGH LOCAL
   TELEPHONE COMPANIES AND, AT LEAST IN PART, THROUGH LEASED NETWORKS THAT
   MAY BECOME UNAVAILABLE.

   We are not a local telephone company or a registered local exchange carrier.
Our network covers only portions of the United States. Accordingly, some
domestic and all international calls made by our customers must be carried at
least in part over leased transmission facilities. Further, because our network
does not

                                       6
<PAGE>


extend to homes or businesses, all calls made by our customers must be routed
through a local telephone company to reach our network and, ultimately, to
reach their final destinations. In many of the foreign jurisdictions in which
we conduct or plan to conduct business, the primary provider of significant
intra-national transmission facilities is the national telephone company.
Accordingly, we may be required to lease transmission capacity at artificially
high rates from a monopolistic provider. These rates may prevent us from
generating a profit on those calls. In addition, national telephone companies
may not be required by law to lease necessary transmission lines to us or, if
applicable law requires national telephone companies to lease transmission
facilities to us, we may encounter delays in negotiating leases and
interconnection agreements and commencing operations. Additionally, disputes
may result with respect to pricing terms and billing.

   In the United States, the providers of local telephone service are generally
the incumbent local telephone companies, including the regional Bell operating
companies. The permitted pricing of local transmission facilities that we lease
in the United States is subject to uncertainties. The Federal Communications
Commission has issued an order requiring incumbent local telephone companies to
price those facilities at total element long-run incremental cost, and the
United States Supreme Court recently upheld the FCC's jurisdiction to set a
pricing standard for local transmission facilities provided to competitors.
However, the incumbent local telephone companies can be expected to bring
further legal challenges to the FCC's total element long-run incremental cost
standard and, if they succeed, the result may be to increase the cost of
incumbent local transmission facilities obtained by us.

   Many of the international telephone calls made by our customers are
transported via transmission facilities that we lease from our current and
potential competitors, including AT&T Global Networks, Frontier and MCI
WorldCom. Additionally, we lease facilities from local exchange carriers that
are our competitors, such as the regional Bell operating companies. We
generally lease lines on a fixed-cost basis. These include leases of
transmission capacity for point-to-point circuits on a monthly or longer-term
fixed-cost basis.


OUR SUCCESS DEPENDS ON OUR ABILITY TO HANDLE A LARGE NUMBER OF SIMULTANEOUS
   CALLS, WHICH OUR SYSTEMS MAY NOT BE ABLE TO ACCOMMODATE.

   We expect the volume of simultaneous calls to increase significantly as we
expand our operations. If this occurs, additional stress will be placed on our
network hardware and software. If we are not able to maintain an appropriate
level of operating performance, or if our service is disrupted, our reputation
could be hurt and our business could suffer.


BECAUSE WE ARE UNABLE TO PREDICT THE VOLUME OF USAGE AND OUR CAPACITY NEEDS, WE
   MAY BE FORCED TO ENTER INTO DISADVANTAGEOUS CONTRACTS THAT WOULD REDUCE OUR
   OPERATING MARGINS.

   In order to ensure that we are able to handle additional usage, we have
agreed to pay IDT a one-time fee of approximately $6.0 million for a 20-year
right to use part of a new high capacity network that is under construction.
This network has been pledged by IDT to its lenders under a credit facility. We
may have to enter into additional long-term agreements for leased capacity. To
the extent that we overestimate our call volume, we may be obligated to pay for
more transmission capacity than we actually use, resulting in costs without
corresponding revenue. Conversely, if we underestimate our capacity needs, we
may be required to obtain additional transmission capacity through more
expensive means that may not be available.


WE MAY NOT BE ABLE TO OBTAIN SUFFICIENT FUNDS TO GROW OUR BUSINESS.

   We intend to continue to grow our business. Due to our limited operating
history and the nature of our industry, our future capital needs are difficult
to predict. Therefore, we may require additional capital after this offering to
fund any of the following:

  .  unanticipated opportunities;

  .  strategic alliances;


                                       7
<PAGE>


  .  potential acquisitions;

  .  changing business conditions; and

  .  unanticipated competitive pressures.

Obtaining additional financing will be subject to a number of factors,
including market conditions, our operating performance and investor sentiment.
These factors may make the timing, amount, terms and conditions of additional
financings unattractive to us. If we are unable to raise additional capital,
our growth could be impeded.


ANY DAMAGE TO OR FAILURE OF OUR SYSTEMS OR OPERATIONS COULD RESULT IN
   REDUCTIONS IN, OR TERMINATIONS OF, OUR SERVICES.

   Our success depends on our ability to provide efficient and uninterrupted,
high-quality services. Our systems and operations are vulnerable to damage or
interruption from natural disasters, power loss, telecommunication failures,
physical or electronic break-ins, sabotage, intentional acts of vandalism and
similar events that may be or may not be beyond our control. The occurrence of
any or all of these events could materially adversely affect our business,
results of operations and financial condition.


UNAUTHORIZED USE OF OUR INTELLECTUAL PROPERTY BY THIRD PARTIES MAY DAMAGE OUR
   BRAND.

   We regard our copyrights, service marks, trademarks, trade secrets and other
intellectual property as critical to our success. We rely on trademark and
copyright law, trade secret protection and confidentiality agreements with our
employees, customers, partners and others to protect our intellectual property
rights. Despite our precautions, it may be possible for third parties to obtain
and use our intellectual property without authorization. Furthermore, the
validity, enforceability and scope of protection of intellectual property in
Internet-related industries is uncertain and still evolving. The laws of some
foreign countries are uncertain or do not protect intellectual property rights
to the same extent as do the laws of the United States.


DEFENDING AGAINST INTELLECTUAL PROPERTY INFRINGEMENT CLAIMS COULD BE EXPENSIVE
   AND COULD DISRUPT OUR BUSINESS.

   We cannot be certain that our products do not or will not infringe upon
valid patents, trademarks, copyrights or other intellectual property rights
held by third parties. We may be subject to legal proceedings and claims from
time to time relating to the intellectual property of others in the ordinary
course of our business. We may incur substantial expenses in defending against
these third-party infringement claims, regardless of their merit. Successful
infringement claims against us may result in substantial monetary liability or
may materially disrupt the conduct of our business. See "Business--Intellectual
Property."

YEAR 2000 PROBLEMS MAY DISRUPT OUR OPERATIONS.

   Many computer systems and software products are coded to understand only
dates that have two digits for the relevant year. These systems and products
need upgrading to accept four digit entries in order to distinguish 21st
century dates from 20th century dates. Without upgrading, many computer
applications could fail or create erroneous results beginning in the year 2000.
The "Year 2000" problems of companies on the Internet generally could affect
our systems or operations. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Year 2000 Systems Costs" for a
more complete description of the Year 2000 risks that we face and the steps we
have taken to reduce those risks.


                                       8
<PAGE>


                RISKS RELATED TO OUR RELATIONSHIP WITH IDT

WE HAVE HISTORICALLY BEEN DEPENDENT ON IDT FOR VARIOUS SERVICES AND WORKING
   CAPITAL, AND FOR ITS TELECOMMUNICATIONS NETWORK.

   In May 1999, we entered into agreements with IDT under which IDT will
continue to provide administrative and telecommunication services to us. When
these agreements expire, we will need to extend them, engage other entities to
perform these services or perform these services ourselves. In addition, after
the initial term, these agreements are terminable by either party upon prior
written notice. We cannot assure you that IDT will not terminate these
agreements or continue to provide these services after the initial term of the
agreements, or that the cost of these services will not be significantly higher
if we purchase services from other parties or devote resources to handle these
functions internally. In addition, IDT has provided us in the past with working
capital to fund our operations, and IDT is not under any obligation, under
these agreements or otherwise, to do so in the future.

WE MAY EXPERIENCE CONFLICTS OF INTEREST WITH IDT, WHICH MAY NOT BE RESOLVED IN
   OUR FAVOR.

   Two members of our board of directors are officers and directors of IDT. One
of these directors, Howard S. Jonas, is the Chairman and Chief Executive
Officer of IDT and IDT's controlling shareholder. Additionally, one of our
directors, James R. Mellor, was a director of IDT until June 1999. Clifford M.
Sobel, our Chairman and President, has an option to transfer his interest in us
to IDT in exchange for an option to purchase 875,000 shares of IDT common stock
at a purchase price of $6.50 per share. See "Certain Transactions." In
addition, certain of our executive officers, directors and employees hold
shares of IDT common stock and options to acquire shares of IDT common stock.
These individuals may have conflicts of interest with respect to certain
decisions involving business opportunities and similar matters that may arise
in the ordinary course of our business or the business of IDT. If conflicts
arise with IDT, we expect to resolve those conflicts on a case-by-case basis,
and in the manner required by applicable law and customary business practices,
subject to our agreement with IDT to resolve disputes involving $5.0 million or
less through mandatory, binding arbitration. Conflicts, if any, could be
resolved in a manner adverse to us and our stockholders, which could harm our
business.

THROUGH ITS OWNERSHIP OF OUR STOCK, IDT EFFECTIVELY CONTROLS OUR COMPANY AND
   MAY EXERT INFLUENCE CONTRARY TO THE INTERESTS OF OTHER STOCKHOLDERS.

   Immediately following this offering, IDT will own approximately 58.2% of our
outstanding capital stock. Because IDT owns Class A stock, which entitles the
holder to two votes per share, IDT will control 65.2% of our voting power.
Therefore, IDT will have the power to determine the election of our directors,
the appointment of new management and the approval of any other action
requiring the approval of our stockholders, including any amendments to our
certificate of incorporation and mergers or sales of our company or of all of
our assets. In addition, without the consent of IDT, we could be prevented from
entering into certain transactions that could be beneficial to us. Third
parties could be discouraged from making a tender offer or bid to acquire us
because of IDT's stockholdings and voting rights. IDT's ownership will increase
further if Clifford M. Sobel exercises his option to transfer his shares of our
stock to IDT in exchange for an option to purchase shares of IDT. See
"Principal Stockholders."

IDT HAS PLEDGED ITS SHARES OF OUR STOCK TO SECURE A CREDIT FACILITY, WHICH
   SHARES MAY BE TRANSFERRED TO A THIRD PARTY THAT WOULD EFFECTIVELY CONTROL US
   IF IDT DEFAULTS ON ITS OBLIGATIONS.

   The shares owned by IDT are pledged as collateral to secure an IDT credit
facility. The lenders under the credit facility have agreed to permit IDT to
transfer our shares free and clear of any liens as and when IDT seeks to
transfer shares of our stock. Such transferability will cease if IDT's
ownership of our capital stock drops below 50% of the number of shares which it
owns 72 hours after the consummation of this offering. If IDT defaults in its
obligations under the credit facility, then a third party could acquire the
voting

                                       9
<PAGE>

rights with respect to the pledged stock and become party to our intercompany
agreements. We cannot assume that a third party would maintain good relations
with us or maintain or renew our agreements with IDT.

                         Risks Related to Our Industry

IF THE INTERNET DOES NOT CONTINUE TO GROW AS A MEDIUM FOR VOICE COMMUNICATIONS,
   OUR BUSINESS WILL SUFFER.

   The technology that allows voice communications over the Internet is still
in its early stages of development. Historically, the sound quality of Internet
calls was poor. As the industry has grown, sound quality has improved, but the
technology requires further refinement. Additionally, the Internet's capacity
constraints may impede the acceptance of Internet telephony. Callers could
experience delays, errors in transmissions or other interruptions in service.
Making telephone calls over the Internet must also be accepted as an
alternative to traditional telephone service. Because the Internet telephony
market is new and evolving, predicting the size of this market and its growth
rate is difficult. If our market fails to develop, then our business and our
opportunity for profitability will be harmed.


OUR BUSINESS WILL NOT GROW WITHOUT INCREASED USE OF THE INTERNET.

   The use of the Internet as a commercial marketplace is at an early stage of
development. Demand and market acceptance for recently introduced products and
services over the Internet are still uncertain. We cannot predict whether
customers will be willing to shift their traditional activities online. The
Internet may not prove to be a viable commercial marketplace for a number of
reasons, including:

  .  concerns about security;

  .  Internet congestion;

  .  inconsistent service; and

  .  lack of cost-effective, high-speed access.

If the use of the Internet as a commercial marketplace does not continue to
grow, then our business will suffer.


GOVERNMENTAL REGULATIONS REGARDING THE INTERNET MAY BE PASSED, WHICH COULD
   IMPEDE OUR BUSINESS.


   To date, governmental regulations have not materially restricted use of the
Internet in our market. However, the legal and regulatory environment that
pertains to the Internet is uncertain and may change. New regulations could
increase our costs of doing business and prevent us from delivering our
products and services over the Internet. The growth of the Internet may also be
significantly slowed. This could delay growth in demand for our products and
services and limit the growth of our revenue.

   In addition to new regulations being adopted, existing laws may be applied
to the Internet. See "Business--Regulation." New and existing laws may cover
issues that include:

  .  sales and other taxes;

  .  access charges;

  .  user privacy;

  .  pricing controls;

  .  characteristics and quality of products and services;

  .  consumer protection;

  .  universal service contributions;

  .  cross-border commerce;

  .  copyright, trademark and patent infringement; and

  .  other claims based on the nature and content of Internet materials.

                                       10
<PAGE>


   In September 1998, two regional Bell operating companies advised Internet
telephony providers that these companies would impose access charges on
Internet telephony traffic. One of these operating companies also petitioned
the FCC for a declaratory ruling that providers of interstate Internet
telephony must pay federal access charges, and has petitioned the public
utilities commissions of Nebraska and Colorado for similar rulings concerning
payment of access charges for intrastate Internet telephone calls. The outcome
of these proceedings is uncertain. A finding that access charges may be levied
against these service providers could affect other Internet telephony service
providers in those states and suggests that other state utility commissions
would make similar rulings.

OUR RISK MANAGEMENT PRACTICES MAY NOT BE SUFFICIENT TO PROTECT US FROM
   UNAUTHORIZED TRANSACTIONS OR THEFTS OF SERVICES.

   We may be the victim of fraud or theft of service. From time to time,
callers have obtained our services without rendering payment by unlawfully
using our access numbers and personal identification numbers. We attempt to
manage these theft and fraud risks through our internal controls and our
monitoring and blocking systems. To date, we have not experienced material
losses from theft or fraud, though we may experience losses in the future.

                         RISKS RELATED TO THIS OFFERING

OUR STOCK PRICE IS LIKELY TO BE HIGHLY VOLATILE AND COULD DROP UNEXPECTEDLY.

   Following this offering, the price for our common stock could be highly
volatile and subject to wide fluctuations in response to the following factors:

  .  quarterly variations in our operating results;

  .  announcements of technical innovations, new products or services by us
     or our competitors;

  .  investor perception of us, the Internet telephony market or the Internet
     in general;

  .  changes in financial estimates by securities analysts; and

  .  general economic and market conditions.

   The stocks of many Internet-related companies have experienced significant
fluctuations in trading price and volume. Often these fluctuations have been
unrelated to operating performance. Declines in the market price of our common
stock could also materially adversely affect employee morale and retention, our
access to capital and other aspects of our business.

IF OUR STOCK PRICE IS VOLATILE, WE MAY BECOME SUBJECT TO SECURITIES LITIGATION,
   WHICH IS EXPENSIVE AND COULD DIVERT OUR RESOURCES.

   In the past, following periods of market volatility in the price of a
company's securities, security holders have instituted class action litigation.
Many companies in our industry have been subject to this type of litigation. If
the market value of our stock experiences adverse fluctuations, and we become
involved in this type of litigation, regardless of the outcome, we could incur
substantial legal costs and our management's attention could be diverted,
causing our business to suffer.

THE SALE OF A SUBSTANTIAL NUMBER OF SHARES OF OUR COMMON STOCK AFTER THIS
   OFFERING MAY AFFECT OUR STOCK PRICE.

   The market price of our common stock could decline as a result of sales of
substantial amounts of common stock in the public market after the closing of
this offering or the perception that substantial sales could occur. These sales
also might make it difficult for us to sell equity securities in the future at
a time and at a price that we deem appropriate.

                                       11
<PAGE>


WE MAY USE THE PROCEEDS FROM THIS OFFERING IN WAYS WITH WHICH YOU MAY NOT
    AGREE.

   We have significant flexibility in applying the proceeds we receive in this
offering. Other than the repayment of $7.0 million on an outstanding note to
IDT and the payment of $1.5 million to NBC for television advertising, the
proceeds are not required to be allocated to any specific investment or
transaction. Therefore, you cannot determine the value or propriety of our use
of proceeds. If we do not apply the funds we receive effectively, our
accumulated deficit will increase and we may lose significant business
opportunities. See "Use of Proceeds" for a more detailed description of how we
intend to apply the proceeds from this offering.

OUR CERTIFICATE OF INCORPORATION, OUR BYLAWS AND DELAWARE LAW MAKE IT DIFFICULT
   FOR A THIRD PARTY TO ACQUIRE US, DESPITE THE POSSIBLE BENEFIT TO OUR
   STOCKHOLDERS.

   Provisions of our certificate of incorporation, our bylaws and Delaware law
could make it more difficult for a third party to acquire us, even if doing so
would be beneficial to our stockholders. For example, our certificate of
incorporation provides for a classified board of directors, meaning that only
approximately one-third of our directors will be subject to re-election at each
annual stockholder meeting. Moreover, our certificate of incorporation creates
a class of stock with super-voting rights. The holders of Class A stock are
entitled to two votes per share while the holders of common stock are entitled
to one vote per share. Except as otherwise required by law or as described
below, the holders of Class A stock and common stock will vote together as a
single class on all matters presented to the stockholders for their vote or
approval, including the election of directors. The holders of Class A stock may
have the ability to elect all of our directors and to effect or prevent certain
corporate transactions. These provisions could discourage takeover attempts and
could materially adversely affect the price of our stock.

                           FORWARD-LOOKING STATEMENTS

   This prospectus contains "forward-looking statements." These forward-looking
statements include, without limitation, statements about our market
opportunity, strategies, competition, expected activities and expenditures as
we pursue our business plan, and the adequacy of our available cash resources.
Our actual results could differ materially from those expressed or implied by
these forward-looking statements as a result of various factors, including the
risk factors described above and elsewhere in this prospectus.

                                       12
<PAGE>

                                USE OF PROCEEDS

   Net2Phone will receive net proceeds of approximately $47.8 million from the
sale of 4,800,000 shares of common stock (and an additional approximately $7.4
million from the sale of 720,000 shares if the underwriters over-allotment
option is exercised in full) at an assumed initial public offering price of
$11.00 per share after deducting underwriting commissions and discounts of $3.5
million (and an additional $554,000 if the underwriters' over-allotment option
is exercised in full) and estimated expenses of $1.5 million.

   We intend to use $7.0 million of the net proceeds from this offering to
repay a portion of the $14.0 million note outstanding to IDT. Additionally,
$1.5 million will be paid to NBC for television advertising. As of the date of
this prospectus, we have not made any other specific allocations with respect
to the proceeds. Therefore, we cannot specify with certainty the particular
uses for the net proceeds to be received upon consummation of this offering.
Accordingly, our management will have significant flexibility in applying the
net proceeds from this offering.



   We expect to use the balance of the net proceeds of this offering for:

  .  developing and maintaining strategic Internet relationships;

  .  advertising and promotion;

  .  research and development;

  .  upgrading and expanding our network; and

  .  general corporate purposes, including working capital.

   Pending any use, the net proceeds of this offering will be invested in
short-term, interest-bearing securities.

                                DIVIDEND POLICY

   We have not paid any dividends in the past and do not intend to pay cash
dividends on our capital stock for the foreseeable future. Instead, we intend
to retain all earnings for use in the operation and expansion of our business.

                                       13
<PAGE>

                                 CAPITALIZATION

   The following table sets forth:

  .  our actual capitalization as of April 30, 1999;

  .  our pro forma capitalization to give effect to:

      .  the conversion of IDT's 27,864,000 shares of our common stock
         into 27,864,000 shares of Class A stock in May 1999,

      .  the sale of 3,140,000 shares of Series A convertible preferred
         stock, which are convertible into 9,420,000 shares of our Class A
         common stock, and warrants to purchase 180,000 shares of our
         common stock in May 1999 for net proceeds of $29.9 million,

      .  the conversion of all outstanding shares of our Series A
         convertible preferred stock into shares of our Class A stock at
         the closing of this offering,

      .  the issuance of warrants to purchase 92,400 shares of our common
         stock granted to the placement agent in May 1999 in connection
         with the sale of our Series A convertible preferred stock,

      .  the repayment of $8.0 million of the amounts owed to IDT in May
         1999,

      .  the conversion of 242,018 shares of Class A stock to common stock
         upon the transfer of these shares from IDT to Clifford M. Sobel
         in May 1999,

      .  the exercise of stock options to purchase 1,375,219 shares of
         common stock in May 1999 in exchange for $3.1 million in
         promissory notes and $1.3 million in cash; and

  .  the pro forma as adjusted balance sheet summarized below reflects:

      .  the sale of 4,800,000 shares of common stock in this offering,

      .  the application of $7.0 million of the estimated net proceeds
         from this offering to pay a portion of the amounts due to IDT,

      .  the conversion of 405,792 shares of Class A stock to common stock
         upon the transfer of those shares from IDT to Clifford M. Sobel
         at the closing of this offering, and

      .  exercise of warrants prior to the closing of this offering to
         purchase 272,400 shares of common stock.

   The information set forth in the table below excludes 3,666,366 shares of
common stock issuable upon exercise of options to purchase our common stock at
a weighted average exercise price of $3.33 per share. This information also
excludes the effect of non-cash compensation in connection with options to
purchase 5,040,000 shares of our common stock that were granted in May 1999 and
options to purchase 2,011,000 shares of our common stock that are expected to
be granted prior to the closing of this offering. See "Management--1999 Stock
Incentive Plan" and "Certain Transactions--Relationship with Other Investors."

<TABLE>
<CAPTION>
                                                   April 30, 1999
                                         -------------------------------------
                                                                    Pro Forma
                                           Actual      Pro Forma   As Adjusted
                                         -----------  -----------  -----------
<S>                                      <C>          <C>          <C>
Due to IDT.............................. $22,000,000  $14,000,000  $ 7,000,000
Redeemable convertible preferred stock,
 Series A, $.01 par value; 3,150,000
 shares authorized, no shares issued and
 outstanding............................          --           --           --
Stockholders' (deficit) equity:
Preferred stock, $.01 par value;
 6,850,000 shares authorized, no shares
 issued and outstanding.................          --           --           --
Common stock, $.01 par value;
 200,000,000 shares authorized;
 30,960,000 (actual) 4,683,237 (pro
 forma) and 10,161,429 (pro forma as
 adjusted) shares issued and
 outstanding............................     309,600       46,832      101,614
Class A stock, $.01 par value;
 37,042,089 shares authorized; none
 (actual) 37,041,982 (pro forma) and
 36,636,190 (pro forma as adjusted)
 shares issued and outstanding..........          --      370,420      366,362
Additional paid-in capital..............   4,420,338   38,696,746   87,367,114
Loans to stockholders...................          --   (3,149,990)  (3,149,990)
Accumulated deficit.....................  (8,656,060)  (8,656,060)  (8,656,060)
                                         -----------  -----------  -----------
Total stockholders' (deficit) equity....  (3,926,122)  27,307,948   76,029,040
                                         -----------  -----------  -----------
Total capitalization.................... $18,073,878  $41,307,948  $83,029,040
                                         ===========  ===========  ===========
</TABLE>

                                       14
<PAGE>

                                    DILUTION

   The net tangible book value of Net2Phone common stock and Class A stock as
of April 30, 1999, as adjusted to give effect to a private placement of
3,140,000 shares of Series A convertible preferred stock in May 1999 and the
exercise of stock options to purchase 1,345,219 shares of common stock, was
$22.3 million, or $0.53 per share of common stock and Class A stock. Net
tangible book value per share represents the amount of our total tangible
assets less our total liabilities, divided by the total number of shares of
common stock and Class A stock outstanding.

   After giving effect to this offering and the receipt of an assumed $47.8
million of net proceeds from this offering (based on an assumed initial public
offering price of $11.00 per share), the issuance of 3,140,000 shares of Series
A convertible preferred stock in May 1999, the conversion of the Series A
convertible preferred stock into 9,420,000 shares of Class A stock and the
exercise of warrants to purchase 272,400 shares of common stock, the pro forma
net tangible book value of the common stock and Class A stock as of April 30,
1999 would have been $71.0 million, or $1.49 per share. This amount represents
an immediate increase in net tangible book value of $0.96 per share to the
existing stockholders and an immediate dilution in net tangible book value of
$9.51 per share to purchasers of common stock in this offering. Dilution is
determined by subtracting pro forma net tangible book value per share after
this offering from the amount of cash paid by a new investor for a share of
common stock. The following table illustrates such dilution:

<TABLE>
<S>                                                                <C>   <C>
  Assumed initial public offering price per share.................       $11.00
    Net tangible book value per share at April 30, 1999 .......... $0.53
    Increase per share attributable to new investors..............  0.96
                                                                   -----
  Pro forma net tangible book value per share after this
  offering........................................................         1.49
                                                                         ------
  Dilution per share to new investors.............................       $ 9.51
                                                                         ======
</TABLE>

   The following table sets forth, as of April 30, 1999, on the pro forma basis
described above, the number of shares of capital stock purchased from us, the
total consideration paid to us and the average price per share paid by existing
stockholders and by new investors who purchase shares of common stock in this
offering, before deducting the estimated underwriting discounts and commissions
and offering expenses.

<TABLE>
<CAPTION>
                           Shares Purchased  Total Consideration
                          ------------------ -------------------  Average Price
                            Number   Percent    Amount    Percent   Per Share
                          ---------- ------- ------------ ------- -------------
<S>                       <C>        <C>     <C>          <C>     <C>
  Existing stockholders.. 41,725,219   89.7% $ 88,742,182  62.7%     $ 2.11
  New investors..........  4,800,000   10.3%   52,800,000  37.3%      11.00
                          ----------  -----  ------------  ----
      Total.............. 46,797,619  100.0% $141,542,182   100%
                          ==========  =====  ============  ====
</TABLE>

                                       15
<PAGE>

                            SELECTED FINANCIAL DATA

   The following selected financial data should be read in conjunction with our
financial statements and related notes thereto and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included elsewhere
in this prospectus. The statement of operations data for the period from
January 2, 1996 (inception) to July 31, 1996, fiscal 1997 and fiscal 1998 and
the balance sheet data as of July 31, 1997 and 1998 are derived from our
financial statements that have been audited by Ernst & Young LLP, independent
auditors, which are included elsewhere in this prospectus. The statement of
operations data for the nine months ended April 30, 1998 and 1999 and the
balance sheet data as of April 30, 1999 have been derived from our unaudited
financial statements that have been prepared on the same basis as the audited
financial statements and, in the opinion of management, include all
adjustments, consisting only of normal recurring accruals, necessary for a fair
presentation of the financial data for the periods presented. The financial
data for the interim periods is not necessarily indicative of results that may
be expected for any other interim period or for the year as a whole.

<TABLE>
<CAPTION>
                           Period from          Year Ended             Nine Months Ended
                         January 2, 1996         July 31,                  April 30,
                           (inception)    ------------------------  -------------------------
                         to July 31, 1996    1997         1998          1998         1999
                         ---------------- -----------  -----------  ------------  -----------
<S>                      <C>              <C>          <C>          <C>           <C>
Statement of Operations
 Data:
 Revenue:
  PC2Phone..............     $      --    $ 2,170,442  $ 7,962,821  $  5,085,176  $13,774,837
  Phone2Phone...........            --            272    2,030,516     1,018,835    6,503,697
  Other.................            --        481,589    2,012,635     1,850,363    1,924,723
                            ----------    -----------  -----------  ------------  -----------
    Total revenue.......            --      2,652,303   12,005,972     7,954,374   22,203,257
                            ----------    -----------  -----------  ------------  -----------
 Cost and expenses:
  Direct cost of
   revenue, excluding
   depreciation.........            --      1,553,443    6,848,759     3,589,301   11,848,089
  Sales and marketing...        34,468         76,724    2,887,766     1,363,060    4,746,316
  General and
   administrative.......       465,015      2,599,283    5,087,628     3,254,287    7,298,106
  Depreciation..........         8,275        120,500      726,508       421,648    1,216,712
                            ----------    -----------  -----------  ------------  -----------
    Total costs and
     expenses...........       507,758      4,349,950   15,550,661     8,628,296   25,109,223
                            ----------    -----------  -----------  ------------  -----------
 Loss from operations
  and net loss..........     $(507,758)   $(1,697,647) $(3,544,689) $   (673,922) $(2,905,966)
                            ==========    ===========  ===========  ============  ===========
 Net loss per share--
  basic and diluted.....     $   (0.02)   $     (0.06) $     (0.12) $      (0.02) $     (0.09)
                            ==========    ===========  ===========  ============  ===========
 Shares used in
  calculation of basic
  and diluted net loss
  per share.............    27,864,000     27,864,000   30,186,000    29,928,000   30,960,000


<CAPTION>
                                                        July 31,                   April 30,
                                          --------------------------------------  -----------
                                             1996         1997          1998         1999
                                          -----------  -----------  ------------  -----------
<S>                      <C>              <C>          <C>          <C>           <C>
Balance Sheet Data:
 Cash and cash equivalents...............  $       --  $        --  $     10,074  $ 1,782,194
 Working capital.........................    (681,532)  (3,104,830)  (11,149,553) (17,255,452)
 Total assets............................     174,674      916,025     6,975,108   19,818,328
 Due to IDT..............................     681,532    2,960,329    11,814,988   22,000,000
 Total stockholders' (deficit)...........    (507,758)  (2,205,305)   (5,649,994)  (3,926,122)
</TABLE>

                                       16
<PAGE>

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

   The following discussion should be read in conjunction with our financial
statements and notes thereto. The historical financial information included in
this prospectus does not necessarily reflect what our financial condition and
results of operations would have been had we been operated as an independent
entity during the periods presented.

Overview

   We began our operations in January 1996, launched our first Net2Phone
product in August 1996, and were established as a separate subsidiary of IDT in
October 1997. During the period ended July 31, 1996, we incurred approximately
$500,000 in start-up costs, primarily for research and development. We have
incurred net operating losses since inception and expect to incur additional
losses for the foreseeable future, primarily as a result of increased sales and
marketing efforts. As of April 30, 1999, we had accumulated net losses of
approximately $8.7 million.

   We will have to recognize a significant charge relating to non-cash
executive compensation expense in the current fiscal quarter ending July 31,
1999, and on an ongoing basis due to accounting policies related to 5,040,000
options granted with an exercise price of $3.33 per share on May 17, 1999,
including options granted to IDT employees for services rendered. These non-
cash charges will be recognized over the vesting period of these options. These
charges could total as high as approximately $41 million. If these charges are
imposed, we would recognize a charge of $13 million in the current quarter, $10
million during fiscal 2000, $10 million during fiscal 2001 and $8 million
during fiscal 2002.

 Sources of Revenue

   For the first nine months of fiscal 1999, approximately 62% of our revenue
has been derived from per-minute charges we billed to our customers on a
prepaid basis to use our PC2Phone service, and approximately 29% of our revenue
has been derived from per-minute charges we billed to our customers and our
international resellers on a prepaid basis to use our Phone2Phone service. The
remainder of our revenue has been derived from the sale of Internet telephony
equipment for Net2Phone Pro, a product that integrates our software into
hardware for the personal computer, and for services we provide to IDT and
other carriers. In the future, in order to diversify and further enhance our
revenue sources, we plan to introduce a variety of value-added services and
Internet commerce solutions. In addition, we plan to sell Web-based advertising
to further leverage our customer reach. To date, these additional products and
services have provided no revenue and we do not anticipate material revenue
from these additional products and services through at least December 1999.

   Approximately 91% of our revenue is generated from per-minute charges we
charge our customers on a prepaid basis to use our PC2Phone and Phone2Phone
services. As of April 30, 1999, we served over 250,000 active customers who
spent an average of approximately 60 minutes per month placing calls over the
Internet. We recognize revenue as our customers utilize the balances in their
prepaid accounts by placing calls. As such, we have deferred revenue for all
unutilized balances in our customers' accounts. The remaining 9% of our
revenue, which is derived from equipment sales and from services provided to
IDT and other carriers, is recognized upon installation of the equipment and
performance of the services.

 Cost Structure

   Our costs and expenses include:

  .  direct cost of revenue;

  .  sales and marketing;

  .  general and administrative; and

  .  depreciation.

                                       17
<PAGE>


 Direct Cost of Revenue

   Direct cost of revenue consists primarily of network costs associated with
carrying and terminating our customers' traffic. These costs exclude
depreciation and include:

  .  amounts paid to other carriers to terminate traffic on a per-minute
     basis;

  .  the cost of leased routers and access servers;

  .  telecommunications costs, including the cost of local telephone lines to
     carry subscriber calls to our network;

  .  the costs associated with leased lines connecting our network directly
     to the Internet or to our operations centers and connecting our
     operations centers to the Internet; and

  .  Internet backbone costs, which are the amounts we pay to Internet
     service providers for capacity.

   We expect our direct cost of revenue to increase in absolute terms over time
to support our growing customer base. While some of these costs are fixed,
other costs vary on a per minute basis. Therefore, there may be some volatility
in our direct cost of revenue as a percentage of revenue, particularly as we
expand our network. We try to terminate calls on our own network whenever
possible. When we cannot terminate calls on our network, we terminate calls on
the network of other suppliers, primarily IDT. We expect to continue to utilize
this process. We also expect the percentage of our traffic that we terminate
with IDT will decline in the future as we expand our own network.

   Sales and Marketing. Sales and marketing includes the expenses associated
with acquiring customers, including commissions paid to our sales personnel,
advertising costs, referral fees and amounts paid to our strategic partners in
connection with revenue-sharing arrangements. We expect sales and marketing
expenses to increase over time as we aggressively market our products and
services. Historically, sales and marketing expenses have been a relatively
variable cost and are expected to increase both in terms of absolute dollars
and as a percentage of revenue as our revenue grows. We expect to spend
significant capital to build brand recognition. Most of our sales and marketing
expenses will go toward securing significant and strategic relationships with a
variety of Internet companies. We have strategic alliances with Netscape,
Snap.com, Yahoo!, ZDNet, and InfoSpace.com, and intend to continue to pursue
relationships with other companies.

   General and Administrative. General and administrative expenses consist of
the salaries of our employees and associated benefits, and the cost of
insurance, travel, entertainment, rent and utilities. A large portion of our
general and administrative expenses include operations and customer support.
These include the expenses associated with customer service and technical
support, and consist primarily of the salaries and employment costs of the
employees responsible for those efforts. We expect operations and customer
support expenses to increase over time to support new and existing customers.
We expect general and administrative costs to increase to support our growth,
particularly as we establish a larger organization to implement our business
plan. We include our research and development costs, comprised primarily of
payroll expenses for our technical team of engineers and developers, in general
and administrative expenses. We plan to incur additional costs for research and
development, though they are not expected to increase as a percentage of
revenue. Over time, we expect these relatively fixed general and administrative
expenses to decrease as a percentage of revenue.

   Depreciation. Depreciation primarily relates to our hardware infrastructure.
We depreciate our network equipment over its estimated five-year useful life
using the straight-line method. We plan to acquire a domestic high capacity
network to provide additional capacity to handle the expected increase in
customer traffic as our business grows. In addition, we will be adding more
network hardware as traffic volumes justify. We expect depreciation to increase
in absolute terms as we expand our network to support new and acquired
customers, but to decrease as a percentage of total revenue. We have also
entered into a strategic agreement with Netscape, part of which includes the
purchase of software and trademark licenses. We

                                       18
<PAGE>

expect to amortize the costs relating to the software and trademark licenses
acquired from Netscape over the two-year term of the agreement.

   Dependence on IDT. Historically, we have been dependent on IDT for working
capital, its telecommunications network and for various services. In connection
with establishing ourselves as an independent operating entity, we recently
contracted with IDT for telecommunications services and administrative support
on an arms-length basis. We believe that the terms of our agreements with IDT
are no less favorable than those we would have obtained from unaffiliated third
parties.

Results of Operations

  The following table sets forth certain items in our statement of operations
as a percentage of total revenue for the periods indicated:

<TABLE>
<CAPTION>
                                        Percentage of Revenue
                              -----------------------------------------------
                              Period from
                              January 2,
                                 1996     Year Ended      Nine Months Ended
                              (inception)  July 31,           April 30,
                              to July 31, -------------   -------------------
                                 1996     1997    1998      1998       1999
                              ----------- -----   -----   --------   --------
<S>                           <C>         <C>     <C>     <C>        <C>
Revenue:
    PC2Phone.................       --     81.8%   66.3%      63.9%      62.0%
    Phone2Phone..............       --       --    16.9       12.8       29.3
    Other....................       --     18.2    16.8       23.3        8.7
                                 -----    -----   -----   --------   --------
        Total revenue........       --    100.0   100.0      100.0      100.0
                                 -----    -----   -----   --------   --------
Cost and expenses:
    Direct cost of revenue,
     excluding depreciation..       --     58.6    57.0       45.1       53.4
    Sales and marketing......       --      2.9    24.1       17.1       21.4
    General and
    administrative...........       --     98.0    42.4       40.9       32.8
    Depreciation.............       --      4.5     6.1        5.3        5.5
                                 -----    -----   -----   --------   --------
        Total costs and
         expenses............       --    164.0   129.6      108.4      113.1
                                 -----    -----   -----   --------   --------
Loss from operations and net
   loss......................       --    (64.0)% (29.6)%     (8.4)%    (13.1)%
                                 =====    =====   =====   ========   ========
</TABLE>

Comparison of Nine Months Ended April 30, 1998 and 1999

   Revenue. Revenue increased approximately 178% from approximately $8.0
million for the nine months ended April 30, 1998 to approximately $22.2 million
for the nine months ended April 30, 1999. Of total revenue for the nine months
ended April 30, 1999, PC2Phone generated approximately $13.8 million and
Phone2Phone generated approximately $6.5 million. The increase in revenue was
primarily due to an increase in minutes of use resulting from additional
marketing of our products and services. Specifically, revenue from PC2Phone
services increased approximately 171% from approximately $5.1 million for the
nine months ended April 30, 1998 to approximately $13.8 million in revenue for
the corresponding nine-month period in fiscal 1999. Revenue from Phone2Phone
increased approximately 550% from approximately $1.0 million for the nine
months ended April 30, 1998 to approximately $6.5 million for the nine months
ended April 30, 1999. We anticipate that revenue from PC2Phone and Phone2Phone
will increase in absolute terms as our products become more widely distributed.
However, as a percentage of revenue, we expect revenue from these products to
decline over the next several years as we begin to market additional products
and services and pursue additional sources of revenue.

                                       19
<PAGE>


   In addition, we recognized revenue from certain amounts charged to IDT and
other carriers and from equipment sales, as shown above in the category
"Other." From these transactions, including monitoring IDT's network operations
center for Internet customers, we recognized revenue of approximately $329,000
and $680,000 for the nine months ended April 30, 1998 and 1999, respectively.
We also realized revenue from the sale of equipment, totaling approximately
$1.5 million for the nine months ended April 30, 1998 as compared to equipment
sales of approximately $446,000 for the nine months ended April 30, 1999.
Equipment sales for the nine months ended April 30, 1999 were derived from our
Net2Phone Pro product, while equipment sales for the nine months ended April
30, 1998 represented Internet telephony servers sold, on a one-time
non-recurring basis, to an international Phone2Phone reseller for deployment
abroad. Revenue from equipment sales, particularly revenue from sales of
Internet telephony servers, reflect sales that we believe to be non-recurring
and do not represent any trend.

   Direct Cost of Revenue, Excluding Depreciation. Total cost of revenue,
excluding depreciation increased by 228% from $3.6 million for the nine months
ended April 30, 1998 to approximately $11.8 million for the nine months ended
April 30, 1999. As a percentage of total revenue, these costs increased from
approximately 45.1% for the nine months ended April 30, 1998 to approximately
53.4% for the nine months ended April 30, 1999. This increase is primarily
attributable to the fact that we sold approximately $1.5 million of equipment
in the nine months ended April 30, 1998 as compared to approximately $446,000
in the nine months ended April 30, 1999. Such equipment sales have a low cost
of sales associated with them. Over time, we expect direct cost of revenue to
decline on a per-minute basis as international competition among carriers
intensifies, resulting in lower prices from our suppliers, and as we leverage
our position as a large provider of services and expand our own network. As a
percentage of revenue, we expect direct cost of revenue to increase as a result
of a decline in per-minute charges to customers. We expect to continue to
utilize IDT's international and domestic networks at the current fair market
value rates for termination. We also expect to incur additional costs in
connection with the growth of our business, especially in connection with
increasing our own network capacity to handle increased traffic volumes.

   Sales and Marketing. Sales and marketing expenses increased approximately
236% from approximately $1.4 million for the nine months ended April 30, 1998
to approximately $4.7 million for the nine months ended April 30, 1999. As a
percentage of total revenue, these costs increased from approximately 17.1% for
the nine months ended April 30, 1998 to approximately 21.4% for the nine months
ended April 30, 1999. This increase primarily reflects the increased marketing
and advertising expenses associated with the agreements established with
Yahoo!, Excite and other strategic partners. We expect to continue to increase
our advertising and marketing expenditures to further build brand recognition,
and to enhance the distribution of our products and services.

   General and Administrative. General and administrative expenses increased
approximately 121% from approximately $3.3 million for the nine months ended
April 30, 1998 to approximately $7.3 million for the nine months ended April
30, 1999. As a percentage of total revenue, these costs decreased from
approximately 40.9% for the nine months ended April 30, 1998 to approximately
32.8% for the nine months ended April 30, 1999. This decrease primarily
reflects the efficiencies we have begun to realize from leveraging our sales
and support infrastructure. We believe that general and administrative expenses
will continue to decline as a percentage of total revenue as a result of
greater economies of scale and further efficiencies. In absolute terms, we
expect these expenses to continue to increase as we incur additional costs in
product development and costs associated with hiring additional personnel and
adding new office space. Moreover, in absolute terms, our research and
development expenses will increase as we hire the additional engineers
necessary to continue the development of new products and services. However,
these research and development expenses are not expected to significantly
increase as a percentage of our total revenue.

   Depreciation. Depreciation increased from approximately $422,000 for the
nine months ended April 30, 1998 to approximately $1.2 million for the nine
months ended April 30, 1999. This increase is primarily attributable to the
increase in capital expenditures for the deployment of network equipment both

                                       20
<PAGE>


domestically and internationally to manage increased call volumes. Depreciation
will continue to increase as we build out our network and amortize intangibles
such as our licenses and trademark rights acquired under agreements with
strategic partners, including Netscape.

   Loss from Operations. Loss from operations was approximately $674,000 for
the nine months ended April 30, 1998 as compared to loss from operations of
approximately $2.9 million for the nine months ended April 30, 1999. This
change is due to the substantial increase in both sales and marketing expenses
as well as general and administrative expenses we incurred as we expanded our
corporate infrastructure and human resources. We anticipate continued and
increasing losses as we pursue our growth strategy.

Comparison of Fiscal Years Ended July 31, 1997 and 1998

   Revenue. Revenue increased approximately 344% from approximately $2.7
million for fiscal 1997 to approximately $12.0 million for fiscal 1998. The
increase in revenue was primarily due to an increase in minutes of use
resulting from increased marketing of our Internet telephony products and
services.

   Of total revenue for the year ended July 31, 1998, PC2Phone generated
approximately $8.0 million in revenue and Phone2Phone generated approximately
$2.0 million. The increase in revenue was primarily due to an increase in
minutes of use due to the marketing of our Internet telephony products and
services. Specifically, revenue from PC2Phone services increased approximately
264% from approximately $2.2 million in revenue for fiscal 1997 to
approximately $8.0 million in revenue for fiscal 1998. We realized significant
revenue for the first time from our Phone2Phone services for fiscal 1998, as
well as recorded revenue of approximately $1.5 million from the sale of
equipment. In addition, we recognized revenue from amounts charged to IDT
including monitoring the network operations center for IDT's Internet
customers, of approximately $297,000 and $453,000, respectively, for fiscal
1997 and 1998. We do not expect to realize significant revenue from the sale of
equipment in the future.

   Direct Cost of Revenue, Excluding Depreciation. Total cost of revenue,
excluding depreciation increased by approximately 325% from approximately $1.6
million for fiscal 1997 to approximately $6.8 million for fiscal 1998. As a
percentage of total revenue, these costs decreased from approximately 58.6% for
fiscal 1997 to approximately 57.0% for fiscal 1998. This decrease is primarily
attributable to the impact of the higher margin equipment sold in the first
half of fiscal 1998. Since we do not expect to realize significant revenue from
the sale of equipment in the future, our direct costs will reflect our ability
to terminate our traffic worldwide cost-effectively through our own network
relationships or via those of IDT, our primary supplier. As a percentage of
revenue we anticipate direct costs to remain approximately the same as our
network expansion efforts mitigate potential pricing pressures.

   Sales and Marketing. Sales and marketing expenses increased by a factor of
37 from approximately $77,000 for fiscal 1997 to approximately $2.9 million for
fiscal 1998. As a percentage of total revenue, these costs increased from
approximately 2.9% for fiscal 1997 to approximately 24.1% for fiscal 1998. This
increase primarily reflects the increased marketing and advertising expenses
associated with the agreements established with Yahoo!, Excite and other
strategic partners. We expect to continue to increase significantly our
advertising and marketing expenditures to further build brand recognition, and
to enhance the distribution of our products and services.

   General and Administrative. General and administrative expenses increased
approximately 96% from approximately $2.6 million for fiscal 1997 to
approximately $5.1 million for fiscal 1998. As a percentage of total revenue,
these costs decreased from approximately 98.0% for fiscal 1997 to approximately
42.4% for fiscal 1998. This decrease primarily reflects the efficiencies we
have begun to realize from leveraging our sales and support infrastructure. We
expect to continue to see further efficiencies and greater economies of scale,
so that general and administrative expenses will continue to decline as a
percentage of total revenue. In absolute terms, we expect these expenses to
continue to increase as we incur additional costs associated with developing
new products, hiring of additional personnel and adding new office space.

                                       21
<PAGE>


   Depreciation. Depreciation increased from approximately $121,000 for fiscal
1997 to approximately $727,000 for fiscal 1998. This increase is primarily
attributable to the increase in capital expenditures for the
deployment of communications equipment both domestically and internationally to
manage increased customer volume.

   Loss from Operations. Loss from operations was approximately $1.7 million
for fiscal 1997 as compared to approximately $3.5 million for fiscal 1998. The
increased losses reflect the substantial increase in marketing and general and
administrative costs we incurred as we expanded our corporate infrastructure
and resources to gain additional market share for our products and services.

Period from January 2, 1996 (inception) to July 31, 1996

   During the period from January 2, 1996 (inception) to July 31, 1996, we did
not generate any revenue. During this period, we incurred approximately
$500,000 in start-up costs, primarily for research and development, as we
prepared to introduce our products and services.

Quarterly Results of Operations

   The following table sets forth certain quarterly financial data for the
seven quarters ended April 30, 1999. This quarterly information is unaudited,
has been prepared on the same basis as the annual financial statements, and, in
our opinion, reflects all adjustments (consisting only of normal recurring
accruals) necessary for a fair presentation of the information for periods
presented. Operating results for any quarter are not necessarily indicative of
results for any future period.

<TABLE>
<CAPTION>
                                                          Quarter Ended
                         -----------------------------------------------------------------------------------------
                          Oct. 31,    Jan. 31,    April 30,     July 31,      Oct. 31,      Jan. 31,    April 30,
                            1997        1998        1998          1998          1998          1999         1999
                         ----------  ----------  -----------   -----------   -----------   ----------   ----------
<S>                      <C>         <C>         <C>           <C>           <C>           <C>          <C>
Revenue:
 PC2Phone............... $1,371,598  $1,693,812  $ 2,019,766   $ 2,877,645   $ 3,776,777   $4,809,644   $5,188,416
 Phone2Phone............     70,939     148,572      799,324     1,011,681     1,287,415    2,280,366    2,935,916
 Other..................    825,000     905,000      120,363       162,272       599,227      412,456      913,040
                         ----------  ----------  -----------   -----------   -----------   ----------   ----------
   Total revenue........  2,267,537   2,747,384    2,939,453     4,051,598     5,663,419    7,502,466    9,037,372
Cost and expenses:
 Direct cost of
  revenue, excluding
  depreciation..........    602,389   1,070,051    1,916,861     3,259,458     3,353,247    3,970,504    4,524,338
 Sales and marketing....    133,963     316,141      912,956     1,524,706     1,299,903    1,691,810    1,754,603
 General and
  administrative........    730,893   1,073,165    1,450,229     1,833,341     1,900,234    2,286,770    3,111,102
 Depreciation...........     68,169     123,844      229,635       304,860       338,469      400,584      477,659
                         ----------  ----------  -----------   -----------   -----------   ----------   ----------
   Total costs and
    expenses............  1,535,414   2,583,201    4,509,681     6,922,365     6,891,853    8,349,668    9,867,702
                         ----------  ----------  -----------   -----------   -----------   ----------   ----------
Income (loss) from
 operations and net
 income (loss).......... $  732,123  $  164,183  $(1,570,228)  $(2,870,767)  $(1,228,434)  $ (847,202)  $ (830,330)
                         ==========  ==========  ===========   ===========   ===========   ==========   ==========
<CAPTION>
                                                   As a Percentage of Revenue
                         -----------------------------------------------------------------------------------------
<S>                      <C>         <C>         <C>           <C>           <C>           <C>          <C>
Revenue:
 PC2Phone...............       60.5%       61.7%        68.7%         71.0%         66.7%        64.1%        57.4%
 Phone2Phone............        3.1         5.4         27.2          25.0          22.7         30.4         32.5
 Other..................       36.4        32.9          4.1           4.0          10.6          5.5         10.1
                         ----------  ----------  -----------   -----------   -----------   ----------   ----------
   Total revenue........      100.0       100.0        100.0         100.0         100.0        100.0        100.0
Cost and expenses:
 Direct cost of
  revenue, excluding
  depreciation..........       26.6        38.9         65.2          80.4          59.2         52.9         50.1
 Sales and marketing....        5.9        11.5         31.1          37.6          23.0         22.6         19.4
 General and
  administrative........       32.2        39.1         49.3          45.2          33.6         30.5         34.4
 Depreciation...........        3.0         4.5          7.8           7.5           6.0          5.3          5.3
                         ----------  ----------  -----------   -----------   -----------   ----------   ----------
   Total costs and
    expenses............       67.7        94.0        153.4         170.7         121.8        111.3        109.2
                         ----------  ----------  -----------   -----------   -----------   ----------   ----------
Income (loss) from
 operations and net
 income (loss)..........       32.3%        6.0%       (53.4)%       (70.7)%       (21.8)%      (11.3)%       (9.2)%
                         ==========  ==========  ===========   ===========   ===========   ==========   ==========
</TABLE>

                                       22
<PAGE>


   We have experienced growth in revenue in each quarter since inception,
reflecting greater acceptance and usage of our products and services by our
expanded customer base. We expect our revenue to grow over time as minutes of
use increase. However, we may experience declines in average revenue per minute
due to competitive pressures, promotions and marketing initiatives, increased
commissions paid to our international resellers and increased amounts paid to
our strategic partners under existing and future revenue-sharing arrangements.

   Since we derive revenue from more than one source, we have experienced
volatility in our direct costs of revenue. Specifically, our direct cost of
revenue in the first two quarters of fiscal 1998 were low as a percentage of
total revenue due to sales of equipment in these quarters. Since these sales
were on a non-recurring basis, we realized a significant, albeit temporary,
reduced direct cost of revenue for these two quarters.

   In the second half of fiscal 1998, we increased our advertising expenditures
as we began marketing our Phone2Phone service. Revenue from our Phone2Phone
service grew from approximately 5% of total revenue in the first half of the
year to approximately 26% of total revenue in the latter half. We experienced
start-up costs for Phone2Phone that increased our direct cost of revenue for
those two quarters. However, we have been able to reduce direct cost of revenue
for our Phone2Phone product as we expanded our network in the first three
quarters of fiscal 1999, which resulted in lower direct cost of revenue. In the
most recent quarter, direct cost of revenue as a percentage of revenue
accounted for approximately 50% as compared to approximately 80% in the quarter
ended July 31, 1998. Our increased sales and marketing expenses reflect the
relationships we have with various online strategic partners with whom we
advertise our PC2Phone and Phone2Phone services. We anticipate increased
investment in sales and marketing to further build brand recognition of our
products and services.

   As a result of our limited operating history and the emerging nature of the
markets in which we compete, we are unable to accurately forecast our revenue
and direct cost of revenue as they may be impacted by a variety of factors.
These factors include the level of use of the Internet as a communications
medium, seasonal trends, capacity constraints, the amount and timing of our
capital expenditures, introduction of new services by us or our competitors,
price competition, technical difficulties or system downtime, and the
development of regulatory restrictions.

Liquidity and Capital Resources

   Since inception in January 1996, we have financed our operations through
advances from IDT. During the nine months ended April 30, 1999 we also received
capital contributions from IDT of approximately $4.6 million. As of April 30,
1999, we had approximately $1.8 million in cash and cash equivalents. In May
1999 we raised net proceeds of approximately $29.9 million from the sale of
Series A convertible preferred stock and warrants. Our operating activities
generated negative cash flow of approximately $409,000 in the nine months ended
April 30, 1998 compared to negative cash flow of approximately $4.0 million in
the nine months ended April 30, 1999.

   Cash used in investing activities was approximately $4.2 million and
approximately $9.0 million for the nine months ended April 30, 1998 and 1999,
respectively. Our use of cash in investing activities was principally for the
purchase of telecommunications and Internet equipment and for the purchase of a
trademark in the 1999 period.

   In May 1999, we received $29.9 million in net proceeds from the sale of our
Series A convertible preferred stock and warrants. We applied a portion of the
net proceeds from this sale to repay $8.0 million of the $22.0 million of
advances from IDT that were outstanding as of April 30, 1999. The remaining
$14.0 million due to IDT was converted into a promissory note in May 1999.


   Our principal commitments following the closing of this offering are
   expected to consist of:

  .  the repayment of $7.0 million with respect to the $14.0 million note due
     to IDT;

   .  the payment of $1.5 million to NBC for television advertising time;

                                       23
<PAGE>


  .  the $7.0 million note described above, which is payable to IDT in 60
     monthly installments of principal and interest at a rate of 9% per
     annum, commencing in June 1999;

  .  the acquisition of a new network with expanded capacity from IDT in
     exchange for a $6.0 million note, payable in 60 monthly installments of
     principal and interest at a rate of 9% per annum;

  .  other costs relating to network equipment and expansion; and

  .  payments to Internet companies in connection with marketing our products
     and services, which as of April 30, 1999, were approximately $15
     million.


   Our future capital requirements will depend on numerous factors, including
market acceptance of our services, brand promotions, the amount of resources we
devote to the development of our current and future products, and the expansion
of our sales force and marketing our services. We may experience a substantial
increase in our capital expenditures and lease arrangements consistent with the
growth in our operations and staffing. Additionally, we will evaluate possible
investments in businesses, products and technologies. We believe that our
current cash balances, expected cash flow from our operations and the proceeds
of this offering will be sufficient to meet our working capital and capital
expenditure needs for at least the next 12 months. However, there can be no
assurance that we will have sufficient capital to finance potential
acquisitions or other growth oriented activities, and may issue additional
equity securities, incur debt or obtain other financing.

Year 2000 Systems Costs

   Computer systems, software packages, and microprocessor-dependent equipment
may cease to function or generate erroneous data on or after January 1, 2000.
The problem affects those systems or products that are programmed to accept a
two-digit code in date code fields. For example, computer programs that have
time-sensitive software may recognize a date using "00" as the year 1900 rather
than the year 2000. This could result in system failure or miscalculations
causing disruptions of operations, including, among other things, a temporary
inability to process transactions, send invoices or engage in similar normal
business activities. To correctly identify the Year 2000, and therefore be
"Year 2000 compliant," a four-digit date code field is required.

   In connection with IDT's review of its own operations and the operations of
its subsidiaries, we have conducted a comprehensive review of the computer
hardware and software that we use in order to ensure that our computer-related
applications are Year 2000 compliant. Our cost of addressing the Year 2000
issue is not expected to be material to our operations or financial position.
However, the consequences of an incomplete or untimely resolution of the Year
2000 issue could be expected to have a material adverse effect upon our
financial results. In the absence of such a resolution, our ability to route
traffic in a cost effective manner, to deliver our services, to properly obtain
payment for these services, and/or to maintain accurate records of our business
and operations, could be substantially impaired until this issue is remedied.
We may become liable for substantial damages in the event that, as a result of
the Year 2000 issue, we fail to deliver any services that we have contracted to
provide. Also, our name and reputation may be harmed if our services are
disrupted due to Year 2000 problems.

   Our plan to ensure Year 2000 compliance consisted of the following phases:

  .  conducting a comprehensive inventory of internal systems;

   .  assessing and prioritizing any required remediation;

   .  repairing or, if appropriate, replacing any non-compliant systems;

   .  testing all remediated systems for Year 2000 compliance; and

  .  developing contingency plans that may be employed in the event that any
     systems used by us is unexpectedly affected by a previously
     unanticipated Year 2000 problem.

We have substantially completed each of these phases, and believe that our
internal systems are Year 2000 compliant.

                                       24
<PAGE>


   We are conducting an external review of our customers and suppliers, and any
other third parties with whom we do business, to determine their vulnerability
to Year 2000 problems and any potential impact on us. These parties include our
equipment and systems providers. In particular, we may experience problems to
the extent that telecommunications carriers whose networks connect with ours
are not Year 2000 compliant. Our ability to determine the ability of these
third parties to address issues relating to the Year 2000 problem is limited.
To the extent that a limited number of carriers experience disruptions in
service due to the Year 2000 issue, we believe that we will be able to obtain
service from alternate carriers. However, our ability to provide certain
services to customers in selected geographic locations may be limited. There
can be no assurance that such problems will not have a material adverse effect
on our business, reputation or operating results.

   We are also in the process of developing contingency plans with regard to
potential or unforeseen Year 2000 problems. We believe that, in the event that
one or more of our systems, or the systems of third parties with which we do
business, is impaired due to unanticipated Year 2000 issues, our contingency
plans will enable us to temporarily conduct operations on a temporarily
modified basis until such impaired system or systems is remediated.

   There can be no assurances that our suppliers and customers will achieve
full year 2000 compliance before the end of 1999 or that we will develop or
implement effective contingency plans on a timely basis. A failure of our
computer systems or the failure of our suppliers or customers to effectively
upgrade their software and systems for transition to the Year 2000 could have a
material adverse effect on our business, financial conditions and results of
operations.

   Most of our internal systems were developed after developers became aware of
Year 2000 problems. To date, we have not incurred material expenses in
connection with the remediation of Year 2000 related issues. We do not expect
to incur significant costs in connection with Year 2000 related issues.
However, our actual costs may be significant if we discover that any major
portion of our internal systems requires unforeseen remediation. We expense
costs associated with Year 2000 remediation when they are incurred.

Effects of Inflation

   Due to relatively low levels of inflation over the last several years,
inflation has not had a material effect on our results of operations.

Impact of Recently Issued Accounting Standards

   SFAS No. 131, Disclosure about Segments of an Enterprise and Related
Information, was issued in June 1997. We will be required to adopt this new
statement for fiscal 1999. This statement requires use of the "management
approach" model for segment reporting. The management approach model is based
on the way a company's management organizes segments within the company for
making operating decisions and assessing performance. Reportable segments are
based on products and services, geography, legal structure, management
structure or any other manner in which management disaggregates a company. We
do not anticipate that the adoption of this statement will have significant
impact on our financial statements.

                                       25
<PAGE>

                                    BUSINESS

Overview

   Net2Phone is a leading provider of services enabling users to make high-
quality, low-cost telephone calls over the Internet. This service is commonly
referred to as Internet telephony. Our Internet telephony services enable our
customers to call individuals and businesses worldwide using their personal
computers or traditional telephones. We are leveraging our Internet telephony
expertise to integrate real-time voice communication capabilities into the Web.
We currently offer Web-based Internet telephony services, which enable
customers to make calls and send faxes over the Internet using their personal
computers, and basic Internet telephony services, which enable customers to
make calls using traditional telephones and fax machines.

   We have developed a sophisticated PC2Phone software application that enables
the use of our Web-based Internet telephony services. We distribute this
software free of charge through the Internet and through agreements to include
our software with products sold by our strategic partners. In January 1999,
Netscape agreed to embed our PC2Phone software on an exclusive basis into all
versions of Netscape's Internet browser released during the term of our
agreement, including Netscape Navigator and Netscape Communicator. Netscape
also agreed to include a Net2Phone icon on the Netscape Navigator Personal
Toolbar.

   We also have entered into strategic marketing and distribution relationships
with leading Internet companies, including, Excite, InfoSpace.com, Snap.com,
Yahoo! and ZDNet. We have also entered into arrangements with leading computer
equipment and software companies, such as IBM, Compaq, Packard Bell-NEC Europe
and Creative Labs to include our software with their products. We promote our
services through direct sales and marketing and through international resellers
who buy minutes of use from us in bulk, and resell them to customers in their
respective countries. Our software is currently available in eight languages
(English, Spanish, Japanese, French, Dutch, Portuguese, Italian and German). We
intend to make our software available in additional languages as we expand our
international customer base and distribution channels.

   As of April 30, 1999, we served over 250,000 active customers who made an
average of approximately 60 minutes of calls per month and handled over 20
million minutes of use per month. Our net loss increased from approximately
$500,000 in fiscal 1996 and $1.7 million in fiscal 1997 to $3.5 million in
fiscal 1998. Our total assets increased from $916,000 at July 31, 1997 to $7.0
million at July 31, 1998. Our revenue has grown substantially, increasing from
approximately $2.7 million in fiscal 1997 to approximately $12.0 million in
fiscal 1998. Our revenue for the nine months ended April 30, 1999 was
approximately $22.2 million.

Industry Background

   The Internet is experiencing unprecedented growth as a global medium for
communications and commerce. International Data Corporation estimates that the
number of Internet users worldwide will grow from approximately 142 million at
the end of 1998 to 399 million by the end of 2002. These users are increasingly
using the Internet as a communications medium. A recent study by E-Marketer, a
market research firm, estimated that 9.4 billion e-mail messages are delivered
daily. Instant text communication through online "chat" rooms is also gaining
widespread acceptance.

   Online commerce is also becoming widely accepted as a means of doing
business. According to International Data Corporation, Internet users worldwide
purchased more than $50 billion of goods and services in 1998. International
Data Corporation projects that commerce over the Internet will to grow to
approximately $1.3 trillion in 2003.

                                       26
<PAGE>

   Emergence of Internet Telephony

   TeleGeography, a market research firm, estimates that the international long
distance market will grow to $79 billion in 2001, with consumers and businesses
making an estimated 143 billion minutes of international long distance calls.
Despite the large size of this market and the number of minutes of calls made,
traditional international long distance calls are still relatively expensive
for the consumer. The primary reason for this expense is tariffs set by foreign
governments and carriers that are passed on to consumers in the form of higher
long distance rates.

   Internet telephony has emerged as a low cost alternative to traditional long
distance calls. International Data Corporation projects that the Internet
telephony market will grow rapidly to over $23.4 billion in 2003, from
approximately $1.1 billion in 1998.

   Internet telephone calls are less expensive than traditional international
long distance calls primarily because these calls are carried over the Internet
or our network and therefore bypass a significant portion of international long
distance tariffs. The technology by which Internet phone calls are made is also
more cost-effective than the technology by which traditional long distance
calls are made.

   We use a technology called "packet-switching" to break voice and fax calls
into discrete data packets, route them over the Internet or our network and
reassemble them into their original form for delivery to the recipient.
Traditional international long distance calls, in contrast, are made using a
technology called "circuit switching" which carries these calls over
international voice telephone networks. These networks are typically owned by
governments or carriers who charge a tariff for their use. Circuit switching
requires a dedicated connection between the caller and the recipient that must
remain open for the duration of the call. As a result, circuit-switching
technology is inherently less efficient than packet-switching technology which
allows data packets representing multiple conversations to be carried over the
same line. This greater efficiency creates network cost savings that can be
passed on to the consumer in the form of lower long distance rates.

  Integration of Voice into the Web

   We believe that Internet telephony offers significant benefits to consumers
and businesses over and above international long distance cost savings. The
technologies that enable Internet telephony can be applied to integrate live
voice capabilities into the Web. We believe that this integration can further
enhance the potential for the Internet to become the preferred medium for both
communications and commerce. For example, the integration of voice into the Web
would supplement existing text-based modes of Internet communication such as e-
mail and online chat by adding a live, secure, low-cost or free voice
alternative. We believe that this will be attractive both to consumers and
businesses.

   In addition, voice-enabling the Web would give Internet shoppers the ability
to speak directly with customer service representatives of online retailers in
order to ask questions and alleviate concerns about online security. This may
increase the probability that a sale is made and may give online retailers a
key competitive advantage by providing them with opportunities to sell higher
margin and additional products to these customers. Voice-enabling a commercial
Web site may also give online retailers the ability to provide more responsive
customer support and service.

   Integrating live voice capabilities into the Web would also enable Internet
companies to offer enhanced communications services, such as providing Internet
users with a central source for retrieving voicemail, e-mail, faxes and pages.
We believe this would allow these companies to attract more users to their
sites and to increase the amount of time these users spend on their sites. This
increased usage will allow these Internet companies to attract advertisers and
secure higher advertising rates, thereby increasing revenue.

                                       27
<PAGE>

  Limitations of Existing Internet Telephony Solutions

   The growth of Internet telephony has been limited to date due to poor sound
quality attributable to technological issues such as delays in packet
transmission and network capacity limitations. However, recent improvements in
packet-switching technology, new software algorithms and improved hardware have
substantially reduced delays in packet transmissions. In addition, the use of
private networks to transmit calls as an alternative to the public Internet is
helping to alleviate network capacity constraints. Finally, the emergence of
new, lower cost Internet access technologies, such as high-speed modems, are
addressing local Internet access issues.

   Several large long distance carriers, including AT&T and Sprint, have
announced Internet telephony service offerings. However, many of these service
offerings have not been deployed on a large scale. Many also require users to
purchase other telecommunications services or allow only domestic calling.
Smaller Internet telephony service providers also offer low-cost Internet
telephony services from personal computers to telephones and from telephones to
telephones. These services, however, are available only in limited geographic
areas and require payment by credit card which may preclude many international
customers from signing up for these services. We also believe that existing
Internet telephony service providers rely upon technologies and systems that
lack large-scale billing, network management and monitoring systems, and
customer service capabilities required for the integration of voice
communication into the Web.

   In addition, many companies currently provide Internet telephony software
and services that allow Internet telephone calls to be made between personal
computers. However, most of these companies require both the initiator and the
recipient of the call to have the same software installed on their personal
computers and to be online at the same time.

The Net2Phone Solution

   We deliver high-quality Internet telephony services and voice-enabling Web
applications to consumers and businesses. Our solution provides the following
benefits to our customers:

  .  Low Cost. Our PC2Phone software is distributed free of charge, and our
     services allow our customers to make telephone calls often at a fraction
     of the cost of traditional long distance service. Because international
     long distance calls routed over the Internet bypass the international
     settlement process, we are able to charge lower rates than traditional
     long distance carriers.

  .  High Voice Quality. We offer high voice quality through our proprietary
     packet-switching technologies, which reduce packet loss and delay, route
     packets efficiently and perform quality enhancing functions, such as
     echo cancellation. We intend to continue to enhance the voice quality of
     our services as our customer base and business grow.

  .  Ease of Use and Access. Our services are designed to be convenient and
     easy to access from anywhere in the world. To make a call using our Web-
     based services, a customer need only install our free software on a
     sound-enabled personal computer, register and be connected to the
     Internet. No additional telephone lines or special equipment are
     required. Our Phone2Phone service is also easy to use and requires a
     customer only to register and dial a toll-free or local access number
     from any telephone or fax machine.

  .  Voice-Enabled Online Retailing. Our services enable users anywhere in
     the world to speak with sales or customer service representatives of
     online retailers and other Web-based businesses while visiting their Web
     sites. This provides customers an opportunity to ask questions of and to
     provide credit card information directly to a customer service
     representative if they are concerned about Internet security, thereby
     increasing the likelihood of consummating an online sale. In addition,
     our services allow our customers outside of the United States and Canada
     to access telephone numbers that might otherwise be inaccessible to them
     through their local carriers. For example,

                                       28
<PAGE>

     users of our services in other countries may call United States or
     Canadian toll-free numbers (i.e., telephone numbers with 800, 877 or 888
     prefixes), which are not otherwise available to them, at no charge. The
     ability to communicate with international customers in this manner
     provides United States and Canadian-based online retailers and other
     Web-based businesses with cost effective access to an expansive
     international customer base.

  .  Reliable Service. Our network is reliable because of its technologically
     advanced design. This design allows us to expand our network and add
     capacity by adding switches to the existing network. Our system also
     provides seamless service and high-quality voice transmission through
     our ability to reroute packets if problems arise. We believe that our
     ability to provide reliable service is essential to voice-enable the
     Web.

  .  Ease of Payment and Online Account Access. Once registered, our
     customers are able to make unlimited toll-free calls. In addition, they
     can make toll calls by opening a prepaid account using credit cards,
     wire transfers or checks payable in United States dollars. Acceptance of
     payment in multiple forms enables international customers who may not
     necessarily have credit cards to use our services. Our customers can
     access their accounts via the Internet in order to view their call
     history and account balances, and to increase their prepaid amounts.

  .  Customer Support. We offer live customer support 24 hours a day, seven
     days a week in multiple languages. Our customer support center can be
     accessed from anywhere in the world at no charge either by calling our
     toll-free number, where available, or by using our Web-based Internet
     telephony service. Our integrated customer billing software and call
     management system provide our customer support staff with immediate
     access to user accounts, calling patterns and billing history to help us
     provide better, more responsive customer support.

Strategy

   Our mission is to become the premier Web-based communications enabler. We
intend to leverage our leadership position in the Internet telephony market to
make our communications services readily available worldwide on the Internet
and to develop and market online commerce and related products. Our strategy
includes the following key elements:

  .  Drive Usage through Resellers and Strategic Partners. We promote our
     services through direct sales and marketing and through relationships
     with international resellers and leading Internet hardware, software and
     content companies. We intend to build on these relationships and to add
     more partners and resellers to drive usage of our Internet telephony
     services. We also intend to partner with large telecommunications
     companies to enable them to offer our Internet telephony services under
     their brand.

  .  Pursue Multiple Sources of Revenue. In addition to our minutes-based
     revenue, we intend to pursue new Web-based revenue opportunities from
     banner and audio advertising, as well as sponsorship opportunities on
     our PC2Phone software user interface and our EZSurf.com Web site. We
     also intend to explore the availability of revenue-sharing opportunities
     with online retailers.

  .  Enhance Brand Recognition. We have established strong brand identity in
     the Internet telephony market in large part due to the high-quality of
     our services and our marketing efforts. We have entered into advertising
     relationships with leading Web companies such as Netscape, Yahoo! and
     Excite in order to promote our services. We intend to continue to
     implement aggressive advertising and sales campaigns to increase brand
     awareness. In addition, we intend to enhance our brand recognition by
     cooperatively marketing our Internet telephony services with leading
     computer hardware and software companies and Internet services
     providers.

  .  Make Our Software Readily Available Worldwide. We have entered into
     strategic distribution relationships with leading computer equipment and
     software companies to expand the availability of our software. For
     example, our software will be embedded into future versions of
     Netscape's

                                      29
<PAGE>


     Internet browser and a Net2Phone icon will be prominently positioned
     next to AOL's Instant Messenger icon on the Netscape Navigator Personal
     Tool Bar. In addition, our software is included with IBM's Internet
     services and may be pre-loaded on computers sold by Compaq
     internationally. We intend to build upon these relationships and enter
     into new distribution relationships with other leading companies in
     order to enhance the distribution of our software worldwide.

  .  Expand and Enhance Products and Services. We have committed significant
     resources to expand our network, enhance our existing product and
     service offerings and to develop and market additional products and
     services in order to continue to provide customers with high-quality
     Internet telephony services. For example, we plan to introduce new
     products and services, including:

    .  PC2PC, which will allow high-quality Internet telephony from one
       personal computer to another,

    .  voice-enabled chat, which will allow two participants in an online
       chat room discussion to establish direct voice communication with
       each other while maintaining anonymity,

    .  unified messaging services, which we anticipate will include voice,
       fax and electronic messaging with multiple points of access,
       including the Web and conventional telephones,

    .  online commerce applications, which will provide customer service
       representatives of online retailers with real-time access to a
       caller's profile and enable them to "push" specific content onto a
       caller's personal computer screen in order to better assist the
       caller in answering their inquiries,

    .  customer payment applications, which will allow customers to pay for
       online commerce transactions by debiting their Net2Phone account,
       and

    .  video conferencing between two or more personal computer users over
       the Internet.

Strategic Relationships

   We have entered into strategic distribution, integration and advertising
relationships with leading Internet and computer hardware and software
companies. These relationships typically include arrangements under which we
share with our strategic partners a portion of the revenue they bring to us. We
believe that these relationships are important because they provide incentive
to our partners and allow us to leverage the strong brand names and
distribution channels of these companies to market our products and services.
Our strategic partners include:

   Netscape

   Netscape has agreed to embed our PC2Phone software on an exclusive basis in
future versions of Netscape's Internet browser released during the term of our
agreement, including Netscape Navigator and Netscape Communicator. Netscape
also has agreed to:

  .  place a Net2Phone icon on the Netscape Navigator Personal Toolbar
     immediately to the right of the AOL Instant Messenger icon, which will
     allow Netscape users to use our Web-based Internet telephony services
     from anywhere on the Web simply by clicking on our icon;

  .  integrate our services into, and prominently display our services on,
     Netscape Netcenter, including Netscape's Address Book Contacts section
     and Voice Communications section, which will allow Netscape users to
     make calls using our services simply by clicking on a displayed
     telephone number; and

  .  include the software for our Web-based Internet telephony services in
     Netscape's suite of online plug-in software and Netscape Smart Update
     programs (both domestically and when available internationally) for
     downloading by Netscape users from centralized locations on Netscape's
     Web site.

                                       30
<PAGE>

   We also have the right to place a specified amount of banner and other
advertisements on Web pages of our choice on Netscape's domestic and
international Web site. The two-year term of our exclusive agreement with
Netscape commences with the beta release of the next version of Netscape's
Internet browser, which we believe will occur later this year.

   Yahoo!, Excite and InfoSpace.com

   In 1998 we signed an agreement with Yahoo!, which was recently renewed
through 2000. Our Web-based Internet telephony service is integrated into
Yahoo!'s People Search online telephone directory. As a result of this
integration, an Internet user who performs a search on Yahoo! People Search can
simply click on a displayed telephone number to initiate a call to that number.
Under this agreement, we also have the right to have our banner advertising
appear when an Internet user performs a word- or category-search for "Internet
Telephony" or related phrases on Yahoo! Additionally, we have contracted with
Yahoo! to integrate our PC2Phone service into Yahoo!'s Yellow Pages and White
Pages online directories.

   Our Web-based Internet telephony software is also integrated into Excite's
Web sites in its International Network, which includes the United Kingdom,
Germany, France, Japan, Italy, Australia, Sweden and the Netherlands. As a
result, an Internet user in any of these countries will be able to click on any
telephone number that appears on any page on these sites to initiate a call to
that number using our PC2Phone service. In addition, our services will be
prominently featured within the Excite International Network via advertising
and promotion on various channels, including each member's homepage, business,
technology/computer and travel channels, as well as the localized versions of
My Excite, What's New/What's Cool and Mail Excite. We are negotiating with
Excite to have our services integrated into Excite's United States Web sites as
well.

   In addition, our Web-based Internet telephony software is integrated into
InfoSpace.com's network of white and yellow page directory services. This
network of sites includes all the white and yellow page listings in Netscape's
Netcenter Web site, the Microsoft Network, the GO Network and Xoom.com.

   Other Strategic Relationships

   We also have entered into other important strategic relationships with other
leading Internet and computer hardware and software companies, including:

  .  Compaq. Our software is featured as a download from a special Compaq Web
     site accessible directly from the Compaq-branded keyboard, may be pre-
     installed on Compaq-branded computers distributed internationally and
     may be included with their other products.

  .  Snap.com. Promotions for our services and a link to our Web site will be
     prominently displayed on the Snap.com Web site, and we are their
     preferred provider of PC-to-phone services.

  .  ZDNet. We are the preferred provider of Internet telephony services for
     ZDNet and our Web-based Internet telephony service will be integrated
     throughout the ZDNet Web site.

  .  Quicknet Technologies. Our PC2Phone software is integrated into
     Quicknet's telephone handset product called Internet PhoneJACK.

  .  Bigfoot International, WorldPages/Web YP and Internet 800 Directory. Our
     PC2Phone service is integrated into these three popular online
     directories, which allow Internet users to call any listed telephone
     number simply by clicking on the displayed number.

Products and Services

   Current Products and Services

   Our services enable our customers to make low-cost, high-quality phone calls
over the Internet using their personal computers or traditional telephones. Our
principal current product and service offerings are described in the table
below.

                                       31
<PAGE>


 Product/Service       Description                    Benefits
- --------------------------------------------------------------------------------


 Basic Internet
 Telephony Services:   .  Enables customers to         .  International long
  . Phone2Phone           make calls over                 distance rates are
                          traditional telephones          typically 50% to
  . Fax2Fax               and fax machines routed         70% lower than the
                          over the Internet.              rate charged by
  . Net2Phone Pro         Customers must dial             traditional long
                          a local or domestic             distance carriers
                          toll-free access                for calls
                          number to access                originating in the
                          the Net2Phone network.          United States, and
                                                          up to 95% lower for
                       .  Customers are charged           calls originating
                          for toll and long               outside the United
                          distance calls on a             States.
                          per-minute basis. There
                          is no charge for             .  Users do not need
                          calling United States           to purchase
                          and Canadian toll-free          expensive hardware
                          numbers.                        or software.

                       .  Available in the United      .  High voice quality.
                          States and in many
                          international
                          locations.                   .  Faxes are
                                                          transmitted without
                       .  We market Phone2Phone           delay and users
                          under the brand                 receive immediate
                          "Net2Phone Direct."             delivery
                                                          confirmations.


- --------------------------------------------------------------------------------


 Web-based Internet
 Telephony Services:   .  Enables customers to         .  Services are
  . PC2Phone              make calls and send             available to any
                          faxes over the Internet         Internet user with
  . Click2Talk            using their personal            a sound-equipped
                          computers. Customers            personal computer.
                          must install our
  . PC2Fax                software on their            .  International long
                          personal computers,             distance rates are
                          register with us and be         typically 50% to
                          online in order to make         70% lower than the
                          calls. When browsing            rates charged by
                          Web sites that have a           traditional long
                          Click2Talk icon,                distance carriers
                          customers may initiate          for calls
                          calls to a company              originating in the
                          whose site they are             United States, and
                          browsing simply by              up to 95% lower for
                          clicking on the                 calls originating
                          Click2Talk icon.                outside the United
                                                          States.
                       .  Customers are charged
                          for toll and long            .  United States and
                          distance calls on a             Canadian toll-free
                          per-minute basis. There         numbers can be
                          is no charge for                accessed from
                          calling United States           outside the United
                          and Canadian toll-free          States and Canada.
                          numbers.
                                                       .  Facilitates online
                                                          commerce by
                                                          providing live
                                                          voice contact
                                                          between online
                                                          retailers and
                                                          Internet shoppers.

                                                       .  Customers do not
                                                          require multiple
                                                          telephone lines and
                                                          need not log off
                                                          the Internet to
                                                          initiate a call.

- --------------------------------------------------------------------------------

 EZSurf.com            .  A Web-based shopping         .  Enables voice
                          directory powered by            communications with
                          our Web-based Internet          over 300 Web sites.
                          telephony services from
                          which Internet users         .  Educates users by
                          can initiate calls to           providing them with
                          listed online retailers         essential
                          by clicking on an icon          information
                          on the Web site.                required to buy
                                                          products online.
                       .  Lists useful
                          information for key
                          online retailers,
                          including payment and
                          shipping options and
                          return policies.

 ------------------------------------------------------------------------------

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<PAGE>

Sales, Marketing and Distribution

   We distribute our software through the Internet, strategic partnerships and
international resellers. In addition, our software will be embedded into future
versions of Netscape's browser, which, according to International Data
Corporation, was used by 41.5% of all consumer Internet users in mid-1998.
Customers can also download our software at no charge from our Web site and
other Web sites, including Yahoo!'s People Search and Lands' End's home page.

   We also distribute our software through strategic relationships with leading
Internet and computer hardware and software companies, including IBM, Compaq,
Packard Bell-NEC Europe and Creative Labs. Our software is included with our
partners' products and services and distributed domestically and
internationally. We expect to distribute over 25 million units of our software
in 1999 as a result of these and other distribution arrangements.

   We promote our services through online and Internet-based advertising venues
and traditional print advertising in domestic and international publications.
We will also be advertising our services on the NBC television network. Another
way we sell our services internationally is by entering into exclusive
agreements with resellers in other countries. We sell these resellers bulk
amounts of minutes of use of our products and services to be resold in the
resellers' respective countries. For example, in Asia, we have agreements with
Daewoo and Naray Mobile Telecom in South Korea and Marubeni in Japan. In Europe
and the Middle East, we have agreements with CAPCOM in Spain and Dot.LB in
Lebanon, among others. To facilitate distribution and attract users in foreign
countries, we have developed our software in eight languages (English, Spanish,
Japanese, French, Dutch, Portuguese, Italian and German) and intend to increase
the number of languages as our distribution broadens.

Customer Service

   As part of our goal to attract and retain customers, we offer free live
customer support in multiple languages. We employ approximately 67 customer
service representatives, who offer customer support to our users 24 hours a
day, seven days a week. These services can be reached from anywhere in the
world at no cost using either our toll-free number, where available, or our
Web-based Internet telephony services. The customer support staff provides
technical assistance, as well as general service assistance, for all of our
products and services. We also offer customer support via e-mail and fax. Our
integrated customer billing software and call management system provide our
customer support staff with immediate access to user accounts, calling patterns
and billing history, thereby enhancing the quality of service provided to our
customers. In addition, our international resellers typically provide their own
front-line customer support.

Technology

   PC2Phone Software

   Our PC2Phone software is simple to install and to use and has won various
industry awards. The installation process is wrapped in the industry-standard
"Install Shield" product. During installation, the Net2Phone "wizard" verifies
that the user's microphone and speakers are properly set for Internet
telephony. The installation also has a service registration process that allows
the customer to quickly register for paid time with the product. Our software
has several buttons and drop down headings to enable customization. These
buttons allow the user to change specific properties, access and modify
customer account information, program and use speed dialing and verify rates.

   Our PC2Phone software has gone through fourteen releases, each improving
upon our Internet telephony capabilities. The software is a Windows-compliant,
32-bit application written in a high-level PC language. The code is extendible
allowing us to easily add new functionality, yet is relatively compact. The
newest release of our software can record and play sound files allowing us to
deliver voice-mail services and can interface with third party PC mail software
applications such as Eudora and Microsoft Outlook.

                                       33
<PAGE>


   We also have developed a software development kit allowing other companies
to quickly and easily integrate their products with our PC2Phone software. For
example, our services have been successfully integrated with Quicknet's line of
sound cards and telephone interface cards. This integration enables Internet
telephony service to be deployed through inexpensive equipment currently used
throughout the world.

   Call Management System

   To maintain our leadership position in the Internet telephony market, we
believe that reliable and flexible billing, information management, monitoring
and control systems are critical. Accordingly, we have invested substantial
resources to develop and implement our sophisticated real-time call management
information system. Key elements of this system include:

  .  Customer Provisioning. The system provides automated online customer
     registration and customer registration through call centers and
     resellers. It also provides online credit card authorization and batch
     billing capabilities that streamline customer registration. A special
     remote access application program allows other people access to our
     database, enabling sophisticated partners to remotely service customers
     through our system, and to tie our system directly to their own business
     systems. This remote capability includes remote account management and
     continuous real-time call detail and billing information. Additionally,
     the system makes customer account records readily available to call
     center representatives in the event of customer billing problems.

  .  Customer Access. Our system allows customers to independently access
     their billing records online without the need to contact customer
     service representatives.

  .  Fraud Control. Fraud detection and prevention features include caller
     authentication, prevention of multiple simultaneous calls using the same
     account, pin code verification and call duration timers. We also
     generate reports on suspicious calling patterns to detect caller
     registration fraud. We routinely scan for fraudulent content before
     credit card purchases are allowed.

  .  Network Security. Firewalls are employed to prevent attacks on our
     network. We use sophisticated techniques to safeguard sensitive database
     information. In addition, we encrypt call requests and portions of the
     call to prevent "network sniffers" from unauthorized access to data.

  .  Call Routing. The network management system identifies and routes calls
     to the most efficiently priced carrier. The system also automatically
     routes calls around links or servers that are experiencing problems,
     have failed or have been manually taken out of service for maintenance
     or upgrades. This system provides remote administration facilities for
     maintaining routing tables and system monitoring.

  .  Monitoring. The management system provides for real-time monitoring of
     all call information. We are able to track potential problems such as
     too many short calls on a server or a low percentage of call
     completions. The system also provides remote management that allows
     partners to monitor and manage their own accounts.

  .  Reliability. We maintain two separate network operations centers in
     Hackensack and Lakewood, New Jersey. These facilities house redundant
     equipment and have the ability to track calls simultaneously. This
     redundant system gives our network a high degree of reliability,
     enabling each network operations center to serve as a back-up to the
     other.

  .  Detailed Call Records. The management software maintains detailed
     records for each call, including the account number of the caller, the
     caller's phone number, access number used, the point at which the call
     enters and exits our network, the account owner, the calling party, the
     server/service phone number, the number of the called party, a running
     account balance, and rate and billing information, including surcharges.

                                       34
<PAGE>

   The Net2Phone Network

   Through an agreement with IDT, we lease capacity on an Internet network
comprised of leased high-speed fiber optic lines connecting eight major cities
across the United States, and lease high-speed fiber optic lines connecting
smaller cities to the network. We have a right to use network capacity leased
by IDT. The network backbone uses state-of-the-art hardware including Cisco
Series 7000 routers and Nortel Passport switches. Our high-speed backbone
connects traffic at four major public Internet exchange points and is also
facilitated by a growing number of private peering or exchange points with
other networks. Through peering arrangements, we exchange Internet traffic with
25 other Internet backbone providers at these points. We operate IDT's network,
one of the largest Internet access networks, providing local dial-up access
through 36 locations. Our Internet network also includes more than 700
additional network access locations owned by local and regional Internet
service providers.

   We are able to provide service in areas where we do not have dial-up
equipment by utilizing call-forwarding technology to expand our coverage areas
by increasing the total number of local access numbers. We have been closing
down multiple network access points in a number of states in order to
consolidate our equipment into central "Super Point of Presence" locations. For
example, one Super Point of Presence in New Jersey can supply local access for
the entire state of New Jersey.

   The diagram below illustrates the routing of an Internet telephony call
initiated by a customer using a telephone, fax or a personal computer to a
terminating telephone or fax machine over our network.

   [diagram illustrating the routing of traffic over the Net2Phone network]

   We seek to retain flexibility by utilizing dynamic call routing
alternatives. This approach is intended to enable us to take advantage of the
rapidly evolving Internet market in order to provide low-cost service to our
customers. Accordingly, our network employs an "Open Shortest Path First"
protocol that promotes efficient routing of traffic. Additionally, we have
placed redundant hardware for reliability in high traffic areas to minimize
loss of data packets. Each network data exchange point employs hardware to
direct network traffic and a minimum of two dedicated leased data lines to
further increase reliability.

   We manage our network hardware remotely. It is compatible with a variety of
local network systems around the world.

   We believe our Internet telephony network can currently support
approximately 5,000 simultaneous calls. We believe our systems are scalable to
10 times their current capacity through the purchase and installation of
certain additional hardware. To date, the highest number of simultaneous calls
serviced by our network was approximately 1,660 simultaneous calls made on
Father's Day in June 1999.

                                       35
<PAGE>

   The Network Operations Center

   Our Network Operations Center, located in Hackensack, New Jersey, currently
employs a staff of 25 people. There are two groups that work within the network
operations center, the network analysis group and the Internet telephony
monitoring group. Both groups have 24 hours a day, seven days a week coverage
to quickly respond to any issues.

   The network analysis group works around-the-clock monitoring network issues,
handling customer requests, repairing outages and solving security problems.
Their key objective is to provide quality service upon which customers can
rely. Our monitoring group oversees a nationwide real-time network analysis
map, which notifies our staff of network errors. They also use software we
developed to monitor our hardware around the world. This group can dynamically
turn on or turn off equipment and re-route Internet telephony traffic, as
necessary.

Customers

   We have a diverse, global customer base. As of April 30, 1999, approximately
65% of our customers are based outside of the United States. As of April 30,
1999, we served over 250,000 active customers who had used our services during
the preceding three months. In addition, as of June 25, 1999, we had installed
the Click2Talk service on approximately 150 commercial Web sites.

Competition

  Long Distance Market

   The long distance telephony market and, in particular, the Internet
telephony market, is highly competitive. There are several large and numerous
small competitors, and we expect to face continuing competition based on price
and service offerings from existing competitors and new market entrants in the
future. The principal competitive factors in the market include price, quality
of service, breadth of geographic presence, customer service, reliability,
network capacity and the availability of enhanced communications services. Our
competitors include AT&T, MCI WorldCom and Sprint in the United States and
foreign telecommunications carriers.

   Many of our competitors have substantially greater financial, technical and
marketing resources, larger customer bases, longer operating histories, greater
name recognition and more established relationships in the industry than we
have. As a result, certain of these competitors may be able to adopt more
aggressive pricing policies, which could hinder our ability to market our
Internet telephony services. One of our key competitive advantages is the
ability to route calls through Internet service providers, which allows us to
bypass the international settlement process and realize substantial savings
compared to traditional telephone service. Any change in the regulation of an
Internet service provider could force us to increase prices and offer rates
that are comparable to traditional telephone call providers.

  Web-Based Internet Telephony Services

   As consumers and telecommunications companies have grown to understand the
benefits that may be obtained from transmitting voice over the Internet, a
substantial number of companies have emerged to provide voice over the
Internet. In addition, companies currently in related markets have begun to
provide voice over the Internet services or adapt their products to enable
voice over the Internet services. These related companies may potentially
migrate into the Internet telephony market as direct competitors.

  .  Internet Telephony Service Providers. During the past several years, a
     number of companies have introduced services that make Internet
     telephony services available to businesses and consumers. In addition to
     us, AT&T Jens (a Japanese affiliate of AT&T), ICG Communications,
     IPVoice.com, ITXC, OzEmail (which was recently acquired by MCI
     WorldCom), RSL Communications (through

                                       36
<PAGE>


     its Delta Three subsidiary) and VIP Calling provide a range of voice-
     over-the-Internet services. These companies offer PC-to-phone or phone-
     to-phone services that are similar to the services we offer. Some, such
     as AT&T Jens and OzEmail, offer these services within limited geographic
     areas. Additionally, a number of companies have recently introduced Web-
     based voice-mail services and voice-chat services to Internet users.

  .  Software/Hardware Providers. Many companies produce software and other
     computer equipment that may be installed on a user's computer to permit
     voice communications over the Internet. These products generally require
     each user to have compatible software and hardware equipment and rely on
     the public Internet for the transmission of traffic, which often results
     in reduced quality of communications. Representative companies include
     VocalTec and Netspeak. We believe VocalTec's software and hardware are
     unable to handle large numbers of simultaneous calls. Netspeak focuses
     on delivering solutions targeted at traditional call centers that
     require significant customization.

  .  Telecommunications Companies. A number of telecommunications companies,
     including AT&T, Deutsche Telekom, MCI WorldCom and Qwest, currently
     maintain, or plan to maintain, packet-switched networks to route the
     voice traffic of other telecommunications companies. These companies,
     which tend to be large entities with substantial resources, generally
     have large budgets available for research and development and therefore
     may further enhance the quality and acceptance of the transmission of
     voice over the Internet. However, many of these companies are new to the
     Internet telephony market, and therefore may not build brand recognition
     among consumers for these services. These companies also may not have
     the range of product and service offerings that are necessary to
     independently provide a broad set of voice-enabled Web services. AT&T,
     for example, has attempted to enter the market but has focused its
     effort on the cable market and it is unclear if it will continue to
     pursue voice over the Web. Qwest has taken steps to enter the market by
     building a high capacity network in the United States. In addition,
     Qwest has also entered into a three-year strategic alliance with
     Netscape to provide one-stop access to Internet services including long
     distance calling, e-mail, voice mail, faxes, Internet access and
     conference calls.

  .  Network Hardware Manufacturers. Several of the world's major providers
     of telecommunications equipment, such as Alcatel, Cisco, Lucent,
     Northern Telecom and Dialogic (which has entered into an agreement to be
     acquired by Intel) have developed or plan to develop network equipment
     that may be used in connection with the provision of voice over the Web
     services, including routers, servers and related hardware and software.
     By developing this equipment, these manufacturers may exert substantial
     influence over the technology that is used in connection with
     transmission of voice over the Web and may develop products that
     facilitate the quality and timely roll-out of these networks. However,
     these companies are dependent upon the operators of Internet telephony
     networks to purchase and install their equipment into their networks.
     They are also dependent upon the developers of hardware and software to
     market their systems to end users. Cisco currently manufactures Internet
     telephony equipment for low to medium scale networking, but does not
     manufacture high-end Internet telephony equipment for large networks.
     However, Cisco recently acquired two companies that produce devices to
     help Internet service providers transition voice and data traffic to
     packet networks while maintaining traditional phone usage and network
     equipment. Lucent has recently co-developed with VocalTec a set of
     industry standards that have been adopted by major competitors and is
     currently marketing Internet telephony hardware, including servers that
     allow the transmission of calls and faxes over the Internet. Lucent also
     offers related support products, such as billing centers and "Internet
     call centers," which allow Internet access and conversation with a
     customer support agent on a single line.

                                      37
<PAGE>

Research and Development

  Strategic Research and Development

   At our primary research and development center in Lakewood, New Jersey, we
currently employ 12 engineers, whose specialties include software, hardware,
switching, Internet security, voice compression, engineering real-time online
transactions, billing, and network and call management. This staff is devoted
to the improvement and enhancement of our existing product and service
offerings, as well as to the development of new products and services. Current
research and development activities include enhancements to our customer
billing software and call management system to increase the capacity of these
systems, improvements to our Internet telephony hardware to increase capacity
and modifications to our PC2Phone software to increase functionality. Our
future success will depend, in part, on our ability to improve existing
technology and develop new products services that incorporate leading
technology.

   We incurred $473,000 and $481,000 in product development expenses during
fiscal 1997 and fiscal 1998, respectively. For the nine months ended April 30,
1999, we incurred product development expenses of $466,000.

  Management Information Systems Research and Development

   Our management information systems development team, located in Hackensack,
New Jersey, has eleven programmers and a development manager dedicated to
traditional management information systems development and upgrades. The group
supports back-office accounting and reporting software, customer service
support software and database support. The development schedule is primarily
focused on a detailed list of upgrades that have been identified and
prioritized by a team manager. The database architecture is managed by a senior
developer in our Lakewood laboratory who was responsible for similar database
functions at AT&T's WorldNet division.

  Web Research and Development

   The majority of our Web research and development is done by a separate Web
development group located in our headquarters in Hackensack. The group of nine
consists of five developers, two programmers, one graphics designer and one
development manager. The team is responsible for our multiple language Web
site, the EZSurf.com Web site and specialized Web interfaces, including the
integration of our PC2Phone client software into Netscape's Internet browser.

Regulation

  Regulation of Internet Telephony

   The use of the Internet to provide telephone service is a recent market
development. Currently, the Federal Communications Commission is considering
whether to impose surcharges or additional regulations upon certain providers
of Internet telephony. On April 10, 1998, the FCC issued its report to Congress
concerning the implementation of the universal service provisions of the
Telecommunications Act. In the report, the FCC indicated that it would examine
the question of whether certain forms of phone-to-phone Internet telephony are
information services or telecommunications services. The FCC noted that it did
not have, as of the date of the report, an adequate record on which to make a
definitive pronouncement, but that the record suggested that certain forms of
phone-to-phone Internet telephony appear to have the same functionality as non-
Internet telecommunications services and lack the characteristics that would
render them information services. If the FCC were to determine that certain
services are subject to FCC regulation as telecommunications services, the FCC
may require providers of Internet telephony services to make universal service
contributions, pay access charges or be subject to traditional common carrier
regulation. It is also possible that PC2Phone and Phone2Phone services may be
regulated by the FCC differently. In addition, the FCC sets the access charges
on traditional telephony traffic and if it reduces these access charges, the
cost of traditional long distance telephone calls will probably be lowered,
thereby decreasing our competitive pricing advantage.

                                       38
<PAGE>


   In September 1998, two regional Bell operating companies, U S WEST and
BellSouth, advised Internet telephony providers that the regional companies
would impose access charges on Internet telephony traffic. In addition, U S
WEST has petitioned the FCC for a declaratory ruling that providers of
interstate Internet telephony must pay federal access charges, and has
petitioned the public utilities commissions of Nebraska and Colorado for
similar rulings concerning payment of access charges for intrastate Internet
telephone calls. At this time, it is not known whether these companies, U S
WEST and BellSouth, will actually impose access charges or when such charges
will become effective. If these companies succeed in imposing access charges
that may reduce the cost savings of using Internet telephony as compared to
traditional telephone service. The existence of these access charges would
materially adversely affect the development of our Internet telephony business.
In February 1999, the FCC adopted an order concerning payment of reciprocal
compensation that provides support for a possible finding by the FCC that
providers of Internet telephony must pay access charges for at least some
subset of Internet telephony services. If the FCC were to make such a finding,
the payment of access charges could materially adversely effect our business,
results of operations and financial condition. Many of our competitors are
lobbying the FCC for the imposition of access charges on Internet telephony
traffic.

   To our knowledge, there are currently no domestic and few foreign laws or
regulations that prohibit voice communications over the Internet. State public
utility commissions may retain jurisdiction to regulate the provision of
intrastate Internet telephony services. A number of countries that currently
prohibit competition in the provision of voice telephony have also prohibited
Internet telephony. Other countries permit but regulate Internet telephony. If
Congress, the FCC, state regulatory agencies or foreign governments begin to
regulate Internet telephony, such regulation may materially adversely affect
our business, financial condition or results of operations.

  Regulation of the Internet

   Congress has recently adopted legislation that regulates certain aspects of
the Internet, including online content, user privacy, taxation, access charges,
liability for third-party activities and jurisdiction. The European Union has
also enacted several directives relating to the Internet, one of which
addresses online commerce. In addition, federal, state, local and foreign
governmental organizations are considering other legislative and regulatory
proposals that would regulate the Internet. Increased regulation of the
Internet may decrease its growth, which may negatively impact the cost of doing
business via the Internet or otherwise materially adversely affect our
business, results of operations and financial condition.

   The Federal Trade Commission has proposed regulations regarding the
collection and use of personal identifying information obtained from
individuals when accessing Web sites, with particular emphasis on access by
minors. These regulations may include requirements that companies establish
certain procedures to disclose and notify users of privacy and security
policies, obtain consent from users for certain collection and use of
information and to provide users with the ability to access, correct and delete
personal information stored by the company. These regulations may also include
enforcement and redress provisions. There can be no assurance that we will
adopt policies that conform with any regulations adopted by the FTC. Moreover,
even in the absence of those regulations, the FTC has begun investigations into
the privacy practices of companies that collect information on the Internet.
One investigation resulted in a consent decree pursuant to which an Internet
company agreed to establish programs to implement the principles noted above.
We may become subject to a similar investigation, or the FTC's regulatory and
enforcement efforts may adversely affect the ability to collect demographic and
personal information from users, which could have an adverse effect on our
ability to provide highly targeted opportunities for advertisers and electronic
commerce marketers. Any of these developments would materially adversely affect
our business, results of operations and financial condition.

   The European Union has adopted a directive that imposes restrictions on the
collection and use of personal data. Under the directive, citizens of the
European Union are guaranteed rights to access their data, rights to know where
the data originated, rights to have inaccurate data rectified, rights to
recourse in

                                       39
<PAGE>


the event of unlawful processing and rights to withhold permission to use their
data for direct marketing. The directive could, among other things, affect
United States companies that collect information over the Internet from
individuals in European Union member countries, and may impose restrictions
that are more stringent than current Internet privacy standards in the United
States. In particular, companies with offices located in European Union
countries will not be allowed to send personal information to countries that do
not maintain adequate standards of privacy. The directive does not, however,
define what standards of privacy are adequate. As a result, the directive may
adversely affect the activities of entities such as us that engage in data
collection from users in European Union member countries.

Intellectual Property

   Our performance and ability to compete are dependent to a significant degree
on our proprietary and licensed technology. We rely on a combination of patent,
copyright, trademark and trade secret laws and contractual restrictions to
establish and protect our technology. We do not currently have any issued
patents or registered copyrights. All key employees have signed confidentiality
agreements and we intend to require each newly hired employee to execute a
confidentiality agreement. These agreements provide that confidential
information developed by or with an employee or consultant, or disclosed to
such person during his or her relationship with us, may not be disclosed to any
third party except in certain specified circumstances. These agreements also
require our employees to assign their rights to any inventions to us. The steps
taken by us may not, however, be adequate to prevent the misappropriation of
our proprietary rights or technology. In addition, our competitors may
independently develop technologies that are substantially equivalent or
superior to our technology.

   We own the registered service mark for two of the marks used in our business
and have applications pending to register several other service marks relating
to our business.

   We have received correspondence from a company claiming that our use of the
mark "Net2Phone" in connection with Internet telephony services infringes one
of that company's United States registered trademarks, and requesting that we
cease and desist from using the Net2Phone mark. We have responded by denying
any infringement and no legal proceedings have been commenced against us with
respect to this matter. We are also aware of several other parties that employ
marks that are the same or similar to marks that we employ, though these
parties are not in the same business as us. There can be no assurance that the
company which notified us or other companies with similar marks to our marks
will not bring suit to prevent us from using the Net2Phone mark or other marks.
Defending or losing any litigation relating to intellectual property rights
could materially adversely affect our business, results of operations and
financial condition.

   In addition, one of our international resellers, a company known as ITM,
operates a Web site at www.net2phone.net without our permission or
authorization, and in violation of the agency agreement ITM entered into with
us for the distribution of the Net2Phone software with certain ITM software.
Furthermore, ITM has also taken steps to secure registration and ownership of
the Net2Phone mark in France. We have notified them of this violation and will
pursue our claim against them, if necessary, but there can be no assurances
that we can prevent, through litigation or otherwise, ITM from continuing its
operation of the net2phone.net Web site or from obtaining registration and
ownership of the Net2Phone mark in France.

   Another company, NetPhone, currently operates a Web site at www.netphone.com
where it sells a family of computer telephony hardware and applications. There
can be no assurance that the existence of NetPhone's business and Web site will
not materially adversely affect our business. Furthermore, we have not taken
steps to assure foreign protection of our trademarks, except for our recent
filing for registration of the Net2Phone mark in certain European countries. To
the extent trademark rights are acquired through registration in countries
outside the United States, we may not be able to protect our marks or assure
that we are not infringing other parties' marks in those countries.

                                       40
<PAGE>

   There can be no assurance that we will be able to secure significant
protection for all our service marks or trademarks. It is possible that
competitors of ours or others will adopt product or service names similar to
our marks, or try to prevent us from using our marks, thereby impeding our
ability to build brand identity and possible leading to customer confusion.

   We have been assigned the rights to patent applications claiming a number of
the technologies underlying our products and services. Our two United States
patent applications have been rejected, but we are continuing to pursue patent
protection for the claimed subject material. There can be no assurance that the
applications will result in the issuance of patents or that, if issued, such
patents would adequately protect us against competitive technology or that they
would be held valid and enforceable against a challenge. In addition, it is
possible that our competitors may be able to design around any such patents.
Also, our competitors may obtain patents that we would need to license or
circumvent in order to make, use, sell or offer for sale the technology.

   We believe that we do not infringe upon the proprietary rights of any third
party, and no third party has asserted a patent infringement claim against us.
It is possible, however, that such a claim might be asserted successfully
against us in the future. Our ability to make, use, sell or offer for sale our
products and services depends on our freedom to operate. That is, we must
ensure that we do not infringe upon the proprietary rights of others or have
licensed all such rights. We have not requested or obtained an opinion from our
outside counsel as to whether our products and services infringe upon the
intellectual property rights of any third parties. We are aware that patents
have recently been granted to others based on fundamental technologies in the
Internet telephony area. In addition, we are aware of at least one other patent
application involving potentially similar technologies to our own which if
issued could materially adversely affect our business. Because patent
applications in the Unites States are not publicly disclosed until issued,
other applications may have been filed which, if issued as patents, could
relate to our services and products. However, foreign patent applications do
publish before issuance. We are aware of several such publications that relate
to Internet telephony. One such published application claims as an inventor a
previous consultant to IDT and has been assigned to another company. Issuance
of a patent or patents from this application could materially adversely affect
our ability to operate. A party making an infringement claim could secure a
substantial monetary award or obtain injunctive relief which could effectively
block our ability to provide services or products in the United States or
abroad.

   If any of these risks materialize, we could be forced to suspend operations,
to pay significant amounts to defend our rights, and a substantial amount of
the attention of our management may be diverted from our ongoing business, each
of which could materially adversely affect our ability to operate.

   We rely on a variety of technology, primarily software, that we license from
third parties. Most of this technology was purchased or licensed on our behalf
by IDT. Continued use of this technology by us may require that we purchase new
or additional licenses from third parties or obtain consents from third parties
to assign the applicable licenses from IDT. There can be no assurances that we
can obtain those third party licenses needed for our business or that the third
party technology licenses that we do have will continue to be available to us
on commercially reasonable terms or at all. The loss or inability to maintain
or obtain upgrades to any of these technology licenses could result in delays
or breakdowns in our ability to continue developing and providing our products
and services or to enhance and upgrade our products and services.

Employees

   As of May 31, 1999, we had approximately 171 full-time employees, including
approximately 66 in technical support and customer service, 26 in sales and
marketing, 20 in management and finance, 47 in operations, and 12 in research
and development. Our employees are not represented by any union, and we
consider our employee relations to be good. We have never experienced a work
stoppage.

                                       41
<PAGE>

Properties

   Our primary facilities consist of approximately 15,445 square feet, which
comprise our headquarters, executive offices and customer service and technical
support centers, and are located in two buildings in Hackensack, New Jersey
leased from corporations that are owned and controlled by Howard S. Jonas. Mr.
Jonas is one of our directors, a director of IDT and the controlling
stockholder of IDT. These leases expire at the end of February 2002 and require
us to make annual rental payments of $186,144. We also sublease space for some
of our computer equipment in Piscataway, New Jersey from IDT, which leases this
space from a company also owned and controlled by Mr. Jonas. This lease runs
for a three-year term, beginning in May 1999, with monthly rent of $8,400. In
addition, we lease office space in Lakewood, New Jersey for our research and
development center. Pursuant to this lease, which expires at the end of August
2001, we are required to make annual rental payments of $48,125. See "Certain
Transactions--Facility Leases."

Legal Proceedings

   We are not currently a party to any material legal proceedings.

                                       42
<PAGE>

                                   MANAGEMENT

Executive Officers, Directors and Key Employees

   The following persons are our executive officers, directors and director
nominees:

<TABLE>
<CAPTION>
 Name                       Age Position
 ----                       --- --------
 <C>                        <C> <S>
 Clifford M. Sobel.........  49 Chairman of the Board and President
 Howard S. Balter..........  37 Chief Executive
                                Officer and Vice
                                Chairman of the
                                Board
 David Greenblatt..........  47 Chief Operating
                                Officer
 Ilan M. Slasky............  29 Chief Financial
                                Officer
 H. Jeff Goldberg..........  46 Chief Technology
                                Officer
 Jonathan Reich............  33 Executive Vice
                                President-
                                Marketing and
                                Corporate
                                Development
 Martin Rothberg...........  30 Executive Vice
                                President-
                                Strategic Sales
 Jonathan Rand.............  36 Executive Vice
                                President-
                                International
                                Sales and
                                Treasurer
 Howard S. Jonas...........  43 Director
 James A. Courter..........  57 Director
 Gary E. Rieschel..........  43 Director
 James R. Mellor...........  69 Director
 Stephen A. Oxman..........  54 Director Nominee
 Raphael S. Grunfeld.......  52 Director Nominee
</TABLE>

   Clifford M. Sobel has been our President since October 1997, our Chairman of
the board of directors since May 1999 and served as our Chief Executive Officer
from October 1997 to January 1999. Since 1994, Mr. Sobel has been Chairman and
Chief Executive Officer of SJJ Investment Corp., which has invested in
Internet, cable, real estate and cosmetics companies. Prior to this, Mr. Sobel
founded several companies in the design and manufacturing of retail interiors
and themed environments, including DVMI and its subsidiary, Bon-Art
International, and Bauchet International. These companies were sold in 1994 by
Bear, Stearns & Co. Inc. Mr. Sobel has testified before Congress on foreign
trade issues and, by Presidential appointment, served on the Holocaust Memorial
Council in Washington, D.C.

   Howard S. Balter has been a director since October 1997, our Chief Executive
Officer since January 1999, and our Vice Chairman of the board of directors
since May 1999. Mr. Balter also served as our Treasurer from October 1997 to
January 1999. Prior to his employment with us, Mr. Balter was IDT's Chief
Operating Officer from 1993 to 1998 and Chief Financial Officer from 1993 to
1995. Mr. Balter was a director of IDT from December 1995 to January 1999 and
Vice Chairman of IDT's board from 1996 to 1999. From 1985 to 1993, Mr. Balter
operated his own real estate development firm.

   David Greenblatt has been our Chief Operating Officer since January 1999.
Between January 1998 and January 1999, Mr. Greenblatt served as IDT's Vice
President of Networks, during which time he was primarily responsible for the
operations of Net2Phone. Prior to his employment with IDT in January 1998,
Mr. Greenblatt was Senior Vice President of Research and Development for
Nextwave Communications from 1996 to 1997. From January 1984 to August 1996,
Mr. Greenblatt was a principal of Financial Technologies, Inc., where he
managed the process of software conversion for large and medium-sized
businesses. From January 1980 to December 1984, Mr. Greenblatt was an
information technologies consultant for various money center banks. From 1970
to 1980, Mr. Greenblatt has lectured in the areas of Computer Science and
Mathematics at Queen College, New York University, Hunter College and Pace
University.

   Ilan M. Slasky has been our Chief Financial Officer since January 1999.
Prior to his employment with us, Mr. Slasky was IDT's Executive Vice President
of Finance from December 1997 to January 1999, IDT's director of carrier
services from November 1996 to July 1997 and IDT's Director of Finance from May
1996 to November 1996. From 1991 to 1996, Mr. Slasky worked for Merrill Lynch
in various areas of finance, including risk management, fixed income trading
and equity derivatives.

                                       43
<PAGE>


   H. Jeff Goldberg has been our Chief Technology Officer since January 1999.
From January 1996 to January 1999, Mr. Goldberg was our Director of Technology
and a consultant to IDT. Mr. Goldberg was an independent software consultant
from 1985 to 1995, Vice President of Software and a member of the board of
directors at Charles River Data Systems in Massachusetts from 1979 to 1985 and
a developer of multimedia communications software at AT&T Bell Laboratories
from 1977 to 1979. Mr. Goldberg is a founding member of the UNIX standards
committee.

   Jonathan Reich has been our Executive Vice President--Marketing and
Corporate Development since January 1999. Prior to his employment with us, Mr.
Reich was IDT's Senior Vice President of Advertising, Marketing and Business
Development in charge of strategic relationships for both us and IDT from June
1997 to December 1998 and IDT's director of advertising from January 1995 to
November 1997. From 1992 to 1993, Mr. Reich worked for Sanford Bernstein & Co.
as an associate analyst. Prior to this, Mr. Reich was an internal consultant
for Morgan Stanley & Co.

   Martin Rothberg has been our Executive Vice President--Strategic Sales since
January 1999 and a key employee since June 1997. Prior to his employment with
us, Mr. Rothberg was IDT's Director of International Sales from September 1996
to June 1997 and IDT's Director of Domestic Sales from June 1995 to September
1996.

   Jonathan Rand has been our Executive Vice President--International Sales and
Treasurer since January 1999 and a key employee since January 1998. Prior to
joining us, Mr. Rand was a member of IDT's senior management from 1992 to
January 1999, including service as Senior Vice President--International Sales
and Senior Vice President--Finance. Additionally, Mr. Rand is a co-founder and
director of the International Internet Association. Prior to joining IDT, Mr.
Rand operated his own magazine publishing business from 1986 to 1992 and was
employed by Procter & Gamble from 1985 to 1986 in Brand Management.

   Howard S. Jonas was appointed a director in October 1997. Mr. Jonas founded
IDT in August 1990 and has served as Chairman of the Board and Treasurer since
its inception and as Chief Executive Officer since December 1991. Additionally,
he served as President of IDT from December 1991 through September 1996. Mr.
Jonas is also the founder and has been President of Jonas Publishing Corp., a
publisher of trade directories, since its inception in 1979.

   James A. Courter has been a director since May 1999. Mr. Courter has been
President of IDT since October 1996 and a director of IDT since March 1996. Mr.
Courter has been a senior partner in the New Jersey law firm of Courter,
Kobert, Laufer & Cohen, P.C. since 1972. He was also a partner in the
Washington, D.C. law firm of Verner, Liipfert, Bernhard, McPherson & Hand from
January 1994 to September 1996. From 1991 to 1994, Mr. Courter was chairman of
the President's Defense Base Closure and Realignment Commission. Mr. Courter
was a member of the United States House of Representatives for 12 years,
retiring in January 1991. Mr. Courter also serves on the board of directors of
Envirogen and The Berkeley School.


   Gary E. Rieschel was appointed a director in June 1999. Mr. Rieschel is the
Executive Managing Director of SOFTBANK Technology Ventures, which he joined in
January 1996. Mr. Rieschel has extensive overseas experience, having spent over
four years in Tokyo as General Manager of Sequent Computer Systems' Asian
operations. He serves as a Director for several SOFTBANK Technology Ventures'
portfolio companies and is a member of SOFTBANK Corporation's Global Executive
Board.

   James R. Mellor was appointed a director in June 1999. Mr. Mellor served as
a director of IDT between August 1997 and June 1999. Since 1981, Mr. Mellor
worked for General Dynamics Corporation, a developer of nuclear submarines,
surface combatant ships and combat systems. From 1994 until 1997, Mr. Mellor
served as Chairman and Chief Executive Officer of General Dynamics, and from
1993 to 1994, he served as President and Chief Operating Officer of General
Dynamics. Before joining General Dynamics, Mr. Mellor served as President and
Chief Operating Officer of AM International, Inc. now Multigraphics, Inc.
Before

                                       44
<PAGE>


that time, Mr. Mellor spent 18 years with Litton Industries in a variety of
engineering and management positions, including Executive Vice President in
charge of Litton's Defense Group from 1973 to 1997.

   Stephen A. Oxman is expected to become a director after the closing of this
offering. Mr. Oxman currently serves as a managing director in the mergers,
acquisitions and corporate advisory group of Deutsche Bank Securities Inc., an
affiliate of BT Alex. Brown Incorporated. He heads the group's
telecommunications practice and also focuses on the firm's work in Europe. In
1995, Mr. Oxman became a partner in the investment banking firm of James D.
Wolfensohn Incorporated, which merged in 1996 with Bankers Trust, which in turn
merged with Deutsche Bank in 1999. From 1993 to 1994, Mr. Oxman served as
Assistant Secretary of State for European and Canadian Affairs. From 1988 to
1993, Mr. Oxman was a managing director of Wasserstein Perella & Co. and Deputy
Chairman of Wasserstein Perella International. From 1980 to 1988, he was a
partner in the law firm of Shearman & Sterling. During the Carter
administration, Mr. Oxman was Executive Assistant to the Deputy Secretary of
State, and subsequently a consultant to the Secretary of State concerning the
Iran hostage crisis.

   Raphael S. Grunfeld is expected to become a director after the closing of
this offering. Mr. Grunfeld has served as a partner in the Corporate Department
of Morrison & Forester LLP since May 1999. Since November 1995, Mr. Grunfeld
has served as General Counsel and Secretary of Genesis Direct, Inc., a catalog
and Internet direct marketer. He also served as Vice President of Genesis
Direct from November 1995 until March 1999. From 1992 to 1995, Mr. Grunfeld was
General Counsel and Secretary of First Capital Asset Management, Inc. and its
operating subsidiaries, including newspaper, media, money management and broker
dealer companies. From 1992 to 1994 he also served as Executive Vice President,
General Counsel and Secretary to DSI Industries, Inc., a public holding
company, and to its operating subsidiaries engaged in the businesses of medical
diagnostic imagery, oil drilling equipment leasing and plant nurseries.

   In addition, we employ the following additional key employees:

   Ira A. Greenstein has been our General Counsel and Secretary since May 1999.
Mr. Greenstein has been a partner in the law firm of Morrison & Foerster LLP
since 1997 where he serves as the chair of that firm's New York office's
Corporate Department. Prior to 1997, Mr. Greenstein was an associate in the
New York and Toronto offices of Skadden, Arps, Slate, Meagher & Flom LLP. From
1991 to 1992, Mr. Greenstein served as counsel to the Ontario Securities
Commission advising on the implementation of the Multijurisdictional Disclosure
System with the Securities and Exchange Commission. Mr. Greenstein also served
on the Securities Advisory Committee to the Ontario Securities Commission from
1992 to 1996. Mr. Greenstein has testified as an expert in the U.S. securities
laws in U.S. District Court.

   Chaim Ackerman has been a senior software engineer of ours since February
1996. Prior to his employment with us, Mr. Ackerman was a member of the
technical staff at AT&T Bell Laboratories from 1986 to 1996. From 1984 to 1986,
Mr. Ackerman was a member of the technical staff at AT&T Consumer Products.
From 1980 to 1984, Mr. Ackerman worked for Computer Horizons Corporation as a
consultant to Bell Laboratories.

   Sarah Hofstetter has been our Vice President-Corporate Communications since
May 1999. Prior to her employment with us, Ms. Hofstetter was IDT's Vice
President of Corporate Communications, in charge of public relations and brand
imaging from April 1996 to January 1999. From 1995 to 1996, Ms. Hofstetter
worked at The New York Times Syndicate as an editor of the New America News
Service, a wire service specializing in issues related to diversity in the
marketplace. Ms. Hofstetter sits on the editorial boards of Telecom Business
and TeleCard World magazines, and on the Editorial Roundtable of Intel-Card
News magazine.

                                       45
<PAGE>

Board of Directors and Committees of the Board

   Our certificate of incorporation, as amended and restated, provides that the
number of members of our board of directors shall be not less than five and not
more than 11. The number of directors is currently six. Two additional
individuals have been nominated to serve as directors. We also anticipate that
one additional director will be elected after the closing of this offering.
Upon consummation of this offering, the board of directors will be divided into
three classes, with each class to be as nearly equal in number as possible. At
each annual meeting of stockholders, the successors to the class of directors
whose term expires at that time will be elected to hold office for a term of
three years and until their respective successors are elected and qualified.
All of the officers identified above serve at the discretion of our board of
directors.

   IDT and Clifford M. Sobel, our Chairman and President, have agreed to vote
all of their shares in favor of the election of a director nominated by
SOFTBANK Technology Ventures IV and a director nominated by either GE Capital
Equity Investments or NBC, in each case for as long as either entity holds a
majority of the shares of Series A convertible preferred stock originally
purchased by them or the shares into which they are convertible. Gary E.
Rieschel was nominated to our board by Softbank. Neither GE nor NBC has
nominated a director.

   We have established an audit committee and a compensation committee, the
initial member of each of which will be James R. Mellor. We expect to appoint
one or more additional directors to each of these committees after the closing
of this offering.

   The audit committee oversees the retention, performance and compensation of
the independent public accountants, and the establishment and oversight of such
systems of internal accounting and auditing control as it deems appropriate.

   The compensation committee reviews and approves the compensation of our
executive officers, including payment of salaries, bonuses and incentive
compensation, determines our compensation policies and programs, and
administers our stock option plans.

   The board of directors does not have a nominating committee. However, the
board of directors will consider nomination recommendations from stockholders,
which should be addressed to our corporate secretary at our principal executive
offices.


Executive Compensation

   The following table identifies our most highly compensated executive
officers whose salaries and bonuses exceeded $100,000 during fiscal 1998 and
who served as executive officers of Net2Phone during fiscal 1998. Our Chief
Executive Officer, Howard S. Balter was employed as the Chief Operating Officer
and Vice Chairman of IDT during fiscal 1998 and did not serve as an executive
officer of Net2Phone during fiscal 1998. All of the named executive officers
listed below were compensated by IDT during fiscal 1998.

                           Summary Compensation Table

<TABLE>
<CAPTION>
                                                     Long-Term
                                      Annual        Compensation
                                   Compensation        Awards
                                ------------------ --------------
                                                     Securities
Name and Principal       Fiscal                      Underlying      All Other
Position                  Year  Salary($) Bonus($) IDT Options(#) Compensation($)
- ------------------       ------ --------- -------- -------------- ---------------
<S>                      <C>    <C>       <C>      <C>            <C>
Clifford M. Sobel(1)....  1998   100,000        --         --                  --
 Chairman and President
David Greenblatt........  1998   113,174        --     20,000                  --
 Chief Operating Officer
H. Jeff Goldberg........  1998   206,169        --     50,000                  --
 Chief Technology
  Officer
</TABLE>
- ---------------------

(1) Mr. Sobel served as our Chief Executive Officer from October 1997 to
   January 1999.

                                       46
<PAGE>

                        Option Grants During Fiscal 1998

   No options to purchase shares of Net2Phone were granted to the executive
officers named above during fiscal 1998.

   The following table describes the options to acquire shares of common stock
of IDT granted to the individuals named above during fiscal 1998:

<TABLE>
<CAPTION>
                                                                   Potential
                                                               Realizable Value
                                 % of                                 at
                    Number of    Total                          Assumed Annual
                    Securities  Options                         Rates of Stock
                      Under-    Granted                              Price
                    lying IDT     to      Exercise               Appreciation
                     Options   Employees     of                 for Option Term
                     Granted   in Fiscal Base Price Expiration -----------------
Name                   (#)     Year (%)    ($/Sh)      Date    5% ($)   10% ($)
- ----                ---------- --------- ---------- ---------- ------- ---------
<S>                 <C>        <C>       <C>        <C>        <C>     <C>
David Greenblatt..    20,000      1.6      $18.00   Nov. 2007  226,402   573,747
H. Jeff Goldberg..    50,000      4.0      $24.25   June 2008  762,534 1,932,413
</TABLE>

                     Value of IDT Options at Year End

   The following table describes the value of IDT options exercised in fiscal
1998 and the value of unexercised options held by the individuals named above
at July 31, 1998:

<TABLE>
<CAPTION>
                                                       Number of Securities         Value of Unexercised
                          Number of                   Underlying Unexercised            in-the-Money
                           Shares                   Options at Fiscal Year-End   Options at Fiscal Year-End
                         Acquired on                --------------------------- -----------------------------
Names                     Exercise   Value Realized  Exercisable/Unexercisable  Exercisable/Unexercisable (1)
- -----                    ----------- -------------- --------------------------- -----------------------------
<S>                      <C>         <C>            <C>                         <C>
Clifford M. Sobel(2)....   100,000     $1,701,500         100,000/875,000               $1,775,000/--
David Greenblatt........        --             --                20,000/0                  125,000/--
H. Jeff Goldberg........     5,000        111,250          210,000/50,000                3,556,500/0
</TABLE>
- ---------------------

(1) The closing price of IDT's common stock on July 31, 1998, as reported on
    the Nasdaq National Market, was $24.25 per share.

(2) Mr. Sobel has an option that may be exercised beginning in September 1999,
    to transfer his shares of Net2Phone to IDT in exchange for an option to
    acquire 875,000 shares of IDT common stock at a purchase price of $6.50 per
    share. Mr. Sobel will be prohibited by an agreement with the underwriters
    from exercising this option during the 180-day period following the date of
    this prospectus.

                                       47
<PAGE>


                  Value of Net2Phone Options at Year End

   The following table describes the value of Net2Phone options exercised in
fiscal 1998 and the value of unexercised options held by Clifford M. Sobel, our
Chairman and President, at July 31, 1998. None of the other individuals named
in the Summary Compensation Table were granted options to purchase shares of
Net2Phone prior to fiscal 1999.

<TABLE>
<CAPTION>
                                                   Number of Securities         Value of Unexercised
                         Number of                Underlying Unexercised            in-the-Money
                          Shares                Options at Fiscal Year-End   Options at Fiscal Year-End
                         Acquired     Value    ---------------------------- ----------------------------
Names                    Exercise  Realized(1) Exercisable/Unexercisable(2) Exercisable/Unexercisable(2)
- -----                    --------- ----------- ---------------------------- ----------------------------
<S>                      <C>       <C>         <C>                          <C>
Clifford M. Sobel....... 3,096,000     $ 0              0/347,865                       0/--
</TABLE>
- ---------------------

(1) For purposes of this table, the per share value of each share of Net2Phone
    common stock in January 1998 is assumed to be $.03 per share, based upon a
    valuation report prepared by an independent appraiser.

(2) Mr. Sobel received options to purchase an aggregate of 11% of Net2Phone's
    capital stock in connection with his May 1997 employment agreement. Mr.
    Sobel exercised his option to purchase 10% of Net2Phone's capital stock in
    January 1998, and his option to purchase the additional 1% of Net2Phone's
    capital stock terminated under an amendment to his employment agreement
    entered into in May 1999. Mr. Sobel does not currently own any options to
    purchase shares of Net2Phone.

Compensation of Directors

   We intend to grant options to purchase shares of common stock to all of our
non-employee directors under the 1999 Stock Incentive Plan, other than non-
employee directors who serve as officers of IDT. See "1999 Stock Incentive
Plan." Other than as will be provided in that plan and the reimbursement of
reasonable expenses incurred with attending board and committee meetings, we
have not yet adopted specific policies on directors' compensation and benefits
following the closing of this offering.

Employment Agreements

   Clifford M. Sobel, our Chairman and President, is employed pursuant to an
employment agreement that was entered into in May 1997 and amended in May 1999.
The agreement commenced in September 1997 and will expire in September 2000,
and will automatically be extended though September 2001 unless either we or
Mr. Sobel notifies the other that the extension will not take effect. Mr. Sobel
receives an annual base salary of $100,000. In January 1998, in connection with
an option set forth in his employment agreement, Mr. Sobel purchased 10% of our
common stock for $100,000. On the closing date of this offering, Mr. Sobel will
receive from IDT that number of shares of our common stock which will maintain
his holdings, when combined with shares owned by a trust for the benefit of his
offspring, at 8% of our total outstanding capital stock as of that date. Mr.
Sobel's employment agreement also provides him with an option to transfer his
interest in us to IDT in exchange for an option from IDT to purchase 875,000
registered shares of IDT common stock at a purchase price of $6.50 per share.
This option is exercisable at any time from September 15, 1999 through
September 15, 2000, so long as he is employed by us as of September 15, 1999
and owns and holds all of the stock he received, other than shares that he
transferred to a trust for the benefit of his offspring. Mr. Sobel will be
prohibited by an agreement with the underwriters from exercising this option
during the 180-day period following the date of this prospectus.

   At present, none of the other named executive officers or key employees is
party to an employment agreement with us.

1999 Stock Incentive Plan

   Our 1999 Stock Option and Incentive Plan was adopted in April 1999. Under
the plan, our officers, directors, key employees and consultants, together with
those of IDT and its subsidiaries, are eligible to

                                       48
<PAGE>


receive awards of stock options, stock appreciation rights, limited stock
appreciation rights and restricted stock. Options granted under the plan may be
incentive stock options or nonqualified stock options. Stock appreciation
rights and limited stock appreciation rights may be granted simultaneously with
the grant of an option or, in the case of nonqualified stock options, at any
time during its term. Restricted stock may be granted in addition to or in lieu
of any other award made under the plan. A total of 11,040,000 shares of common
stock have been authorized to date for issuance under the plan, 5,040,000 of
which were granted through June 21, 1999, and 1,345,219 of which have been
exercised. These options have a weighted average exercise price of $3.33 per
share. In connection with loans granted to several grantees under the plan to
exercise a portion of these options, 23,382 outstanding options were cancelled.
Additional options to purchase 6,996 shares were cancelled in connection with
the termination of the employment of four grantees. We expect to grant options
to purchase approximately 2,011,000 additional shares of our common stock upon
the consummation of this offering.

   The 1999 Stock Option and Incentive Plan is administered by the compensation
committee of our board. Subject to the provisions of the plan, the board of
directors or the compensation committee will determine the type of award, when
and to whom awards will be granted, the number of shares covered by each award
and the terms and kind of consideration payable with respect to awards. The
board of directors or the compensation committee may interpret the plan and may
at any time adopt the rules and regulations for the plan as it deems advisable.
In determining the persons to whom awards shall be granted and the number of
shares covered by each award, the board of directors or the compensation
committee may take into account the duties of the respective persons, their
present and potential contribution to our success and other relevant factors.

   Stock Options. An option may be granted on the terms and conditions as the
board of directors or the compensation committee may approve, and generally may
be exercised for a period of up to ten years from the date of grant. Generally,
incentive stock options will be granted with an exercise price equal to the
fair market value on the date of grant. Additional limitations will apply to
incentive stock options granted to a grantee that beneficially holds 10% or
more of our voting stock. The board of directors or compensation committee may
authorize loans to individuals to finance their exercise of vested options. See
"Certain Transactions--Officer Loans." Options granted under the 1999 Stock
Option and Incentive Plan will become exercisable at those times and under the
conditions determined by the board of directors or the compensation committee.
To date, the options that have been granted to our executive officers will
generally vest automatically in the event that there is a change of control of
our company, if we are merged into another company or if any of these
individuals are employed by a subsidiary of our company that is sold to another
company.

   The 1999 Stock Option and Incentive Plan provides for automatic option
grants to eligible non-employee directors. Options to purchase 10,000 shares of
common stock will be granted to each eligible non-employee director upon
consummation of this offering and options to purchase 10,000 shares of common
stock will be granted to each new eligible non-employee director upon the
director's initial election to the board. In addition, options to purchase
10,000 shares of common stock are granted annually to each eligible non-
employee director on the anniversary date of his or her election to the board.
Each of these options will have an exercise price equal to the fair market
value of a share of common stock on the date of grant. All options granted to
non-employee directors will be immediately exercisable. All options held by
non-employee directors, to the extent not exercised, expire on the earliest of:

  .  the tenth anniversary of the date of grant;

  .  one year following the optionee's termination of directorship other than
     for cause; and

  .  three months following the optionee's termination of directorship for
     cause.

   Stock Appreciation Rights and Limited Stock Appreciation Rights. The 1999
Stock Option and Incentive Plan also permits the board of directors or the
compensation committee to grant stock appreciation rights and/or limited stock
appreciation rights with respect to all or any portion of the shares of

                                       49
<PAGE>


common stock covered by options. Generally, stock appreciation rights and
limited stock appreciation rights may be exercised only at that time as the
related option is exercisable. Upon exercise of a stock appreciation right, a
grantee will receive for each share for which an stock appreciation right is
exercised, an amount in cash or common stock, as determined by the board of
directors or the compensation committee, equal to the excess of the fair market
value of a share of common stock on the date the stock appreciation right is
exercised over the exercise price per share of the option to which the stock
appreciation right relates.

   Limited stock appreciation rights may be exercised only during the 90 days
following a change in control, or a merger or similar transaction, involving
Net2Phone. Upon exercise of a limited stock appreciation right, a grantee will
receive, for each share for which a limited stock appreciation rights is
exercised, an amount in cash equal to the excess of the highest fair market
value of a share of our common stock during the 90-day period ending on the
date of the limited stock appreciation rights is exercised, or an amount equal
to the highest price per share paid for shares of our common stock in
connection with a merger or a change of control of Net2Phone, whichever is
greater, over the exercise price per share of the option to which the limited
stock appreciation rights relates. In no event, however, may the holder of a
limited stock appreciation right granted in connection with an incentive stock
option receive an amount in excess of the maximum amount that will enable the
option to continue to qualify as an incentive stock option.

   Restricted Stock. The 1999 Stock Option and Incentive Plan further provides
for the granting of restricted stock awards, which are awards of common stock
that may not be disposed of, except by will or the laws of descent and
distribution, for a period of time determined by the compensation committee or
the board of directors. The board or the compensation committee may also impose
other conditions and restrictions on the shares as it deems appropriate,
including the satisfaction of performance criteria. All restrictions affecting
the awarded shares will lapse in the event of a merger or similar transaction
involving Net2Phone.


   The board may amend or terminate the 1999 Stock Option and Incentive Plan.
However, as required by any law, regulation or stock exchange rule, no change
shall be effective without the approval of our stockholders. In addition, no
change may adversely affect an award previously granted, except with the
written consent of the grantee.

   No awards may be granted under the 1999 Stock Option and Incentive Plan
after the tenth anniversary of its initial adoption.

   Options and Awards Under the 1999 Stock Option and Incentive Plan. We cannot
now determine the number of options or awards to be granted in the future under
the 1999 Stock Option and Incentive Plan to officers, directors and employees.

Compensation Committee Interlocks and Insider Participation.

   We did not have a compensation committee during fiscal 1998. Compensation
decisions relating to our executive officers, key employees and other senior
personnel were made primarily by IDT, which owned all of our outstanding
capital stock at the beginning of fiscal 1998. During fiscal 1998, Howard S.
Jonas, who was serving as our chairman, and Howard S. Balter, who was serving
as our treasurer, also served as directors of IDT.

401(k) Plan

   Prior to May 1999, our employees participated in IDT's 401(k) Savings and
Retirement Plan. We are in the process of establishing our own 401(k) plan that
is intended to qualify for preferential tax treatment under section 401(k) of
the Internal Revenue Code. We intend that most of our employees will be
eligible to participate in our 401(k) Savings and Retirement Plan upon
adoption.

                                       50
<PAGE>

                             PRINCIPAL STOCKHOLDERS

   The following table sets forth information with respect to the beneficial
ownership of our outstanding common stock as of June 25, 1999 and as adjusted
to reflect the sale of the common stock offered hereby by:

  .  each person who is the beneficial owner of more than 5% of our capital
     stock;

  .  each of our directors and director nominees;

  .  each of our named executive officers; and

  .  all of our named executive officers, directors and director nominees as
     a group.

   Except as otherwise indicated, all of the shares indicated in the table are
shares of common stock.

<TABLE>
<CAPTION>
                                                                 Percentage
                                          Number of Shares      Beneficially
                                         Beneficially Owned       Owned(1)
                                        --------------------- -----------------
                                         Prior to    After    Prior to  After
Holders                                  Offering   Offering  Offering Offering
- --------------------------------------  ---------- ---------- -------- --------
<S>                                     <C>        <C>        <C>      <C>
IDT Corporation(2)....................  27,622,089 27,216,297   66.2%    58.2%
190 Main Street
Hackensack, New Jersey 07601
Howard S. Jonas(3)....................  27,622,089 27,216,297   66.2%    58.2%
c/o IDT Corporation
190 Main Street
Hackensack, New Jersey 07601
James A. Courter(4)...................  27,658,089 27,252,297   66.2%    58.2%
c/o IDT Corporation
190 Main Street
Hackensack, New Jersey 07601
SOFTBANK Technology Ventures IV,
 L.P.(5)..............................   4,590,000  4,590,000   11.0%     9.8%
333 West San Carlos Street, Suite 1225
San Jose, California 95110
Gary E. Rieschel(6)(7)................   4,590,000  4,600,000   11.0%     9.8%
c/o SOFTBANK Technology Ventures IV,
 L.P.
333 West San Carlos Street, Suite 1225
San Jose, California 95110
Clifford M. Sobel(8)..................   3,337,911  3,743,703    8.0%     8.0%
c/o Net2Phone, Inc.
171 Main Street
Hackensack, New Jersey 07601
America Online, Inc.(9)...............   2,295,000  2,295,000    5.5%     4.9%
22000 AOL Way
Dulles, Virginia 20166
General Electric Company Group(10)....   2,295,000  2,295,000    5.5%     4.9%
120 Long Ridge Road
Stamford, Connecticut 06927
Howard S. Balter(7)(11)...............     714,978    782,028    1.7%     1.7%
David Greenblatt(7)(12)...............     105,840    135,840      *        *
H. Jeff Goldberg(7)(13)...............     105,840    120,840      *        *
James R. Mellor(7)....................         --      10,000      *        *
Stephen A. Oxman(7)...................         --      10,000      *        *
Raphael S. Grunfeld...................         --         --       *        *
Officers, Directors and Director
 Nominees as a Group
 (14 Persons)(14).....................  36,583,128 36,778,178   87.7%    78.3%
</TABLE>

                                       51
<PAGE>

- ---------------------
  * Less than one percent.

 (1) Percentage of beneficial ownership prior to this offering is based on
     4,683,129 shares of common stock and 27,622,089 shares of Class A stock
     outstanding at June 25, 1999 plus 9,420,000 shares of Class A stock
     issuable upon conversion of the Series A convertible preferred stock at
     the same date and the exercise of 272,400 warrants to purchase our common
     stock. Percentage of beneficial ownership after this offering is based on
     46,797,619 total shares outstanding, which includes all shares outstanding
     prior to this offering, plus 4,800,000 shares of common stock to be sold
     in this offering. All percentage calculations assume that all shares of
     Net2Phone's Class A stock have been converted into shares of Net2Phone's
     common stock.

 (2) All of the shares held by IDT are Class A stock. IDT has pledged its
     shares as collateral to secure a credit facility. The lenders under the
     credit facility have agreed to release IDT's shares from collateral to
     permit IDT to transfer our shares free and clear of any liens as and when
     IDT seeks to transfer our shares. Such transferability will cease if IDT's
     ownership of our capital stock drops below 50% of the capital stock owned
     by IDT 72 hours after the consummation of this offering. Unless IDT
     defaults in its obligations under the pledge agreement, it has the voting
     rights with respect to the pledged stock. In addition, in connection with
     the employment agreement between IDT, Mr. Sobel and Net2Phone, IDT will
     transfer to Mr. Sobel the number of shares of stock upon consummation of
     this offering that is necessary to maintain Mr. Sobel's percentage
     ownership of our outstanding stock, together with a trust for the benefit
     of his offspring, at 8%.

 (3) Howard S. Jonas, together with a number of entities formed for the benefit
     of charities and members of his family, owns shares of IDT's capital stock
     that enable him to vote more than 50% of IDT's capital stock. As a result,
     he may be deemed to be the beneficial owner of the shares of Net2Phone
     capital stock owned by IDT. Mr. Jonas disclaims beneficial ownership of
     these shares.

 (4) James A. Courter, one of our directors, is the President, Vice Chairman
     and a director of IDT. As a result, in addition to the 36,000 shares of
     our common stock that he holds directly, he may be deemed to be the
     beneficial owner of the shares of Net2Phone capital stock owned by IDT.
     Mr. Courter disclaims beneficial ownership of these additional shares.

 (5) Includes 4,415,400 shares of Class A stock and 88,308 shares of common
     stock issuable upon conversion of shares of Series A convertible preferred
     stock and presently exercisable warrants, respectively, that have been
     issued to SOFTBANK Technology Ventures IV, L.P. Also includes 84,600
     shares of Class A stock and 1,692 shares of common stock issuable upon
     conversion of shares of Series A preferred stock and presently exercisable
     warrants, respectively, that have been issued to SOFTBANK Technology
     Advisors Fund L.P.

 (6) Gary E. Rieschel is the Executive Managing Director of SOFTBANK Technology
     Ventures, and as a result, he may exercise the power to vote and to
     dispose of the shares held by SOFTBANK.

 (7) Shares owned after the offering include 10,000, 67,050, 30,000, 15,000,
     10,000 and 10,000, shares of common stock that will be issuable upon the
     exercise of stock options that we expect to issue to Messrs. Rieschel,
     Balter, Greenblatt, Goldberg, Mellor and Oxman, respectively, upon the
     closing of this offering that will be immediately exercisable.

 (8) Clifford M. Sobel transferred 1% of our common stock to a trust for the
     benefit of his offspring. All of these shares are deemed to be
     beneficially owned by Mr. Sobel. In addition, in connection with the
     employment agreement between IDT, Mr. Sobel and Net2Phone, IDT will
     transfer to Mr. Sobel the number of shares of stock upon consummation of
     this offering that is necessary to maintain Mr. Sobel's percentage
     ownership of our outstanding stock, together with a trust for the benefit
     of his offspring, at 8%.

 (9) Includes 2,250,000 shares of Class A stock and 45,000 shares of common
     stock issuable upon conversion of shares of Series A convertible preferred
     stock and issuable upon exercise of presently exercisable warrants,
     respectively.

(10) Includes 1,125,000 of Class A stock issuable upon conversion of shares of
     Series A convertible preferred stock that are held of record by GE Capital
     Equity Investments, Inc., which shares beneficial ownership with its
     parent General Electric Capital Corporation, which is a wholly-owned
     subsidiary of the General Electric Company. Also includes 1,125,000 shares
     of Class A stock issuable upon exercise of shares of Series A convertible
     preferred stock that are beneficially owned by NBC, a wholly-owned
     indirect subsidiary of the General Electric Company, of which 300,000
     shares are issuable upon conversion of shares of Series A convertible
     preferred stock that are held of record by Snap! LLC, an Internet portal
     service of NBC and CNET, Inc. Includes 22,500, 16,500 and 6,000 shares of
     common stock issuable upon exercise of warrants held by GE Capital Equity
     Investments, NBC and Snap! LLC, respectively.

(11) Includes 360,000 shares held of record by a trust for the benefit of
     Mr. Balter's family members, of which Mr. Balter and his spouse are the
     trustees. Also includes an aggregate of 183,840 shares held of record by
     trusts for the benefit of the family members of Messrs. Greenblatt, Slasky
     and Rothberg, for which Mr. Balter acts as trustee.

(12) Includes 54,000 shares held of record by a trust for the benefit of Mr.
     Greenblatt's family members, of which Mr. Balter is the trustee.

(13) Includes 72,000 shares held of record by a trust for the benefit of Mr.
     Goldberg's family members, of which Mr. Goldberg's spouse is the trustee.

(14) Includes the shares of Class A stock held by IDT and the shares of Class A
     stock and the shares of common stock issuable upon exercise of presently
     exercisable warrants held by SOFTBANK. Also includes 195,050 shares of
     common stock that will be granted to our directors and executive officers
     upon the closing of this offering.

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                              CERTAIN TRANSACTIONS

   We believe that all of the transactions set forth below were made on an
arms-length basis. All future transactions between us and our officers,
directors, principal stockholders and affiliates will be approved by a majority
of the board of directors, including a majority of the outside directors, and
will continue to be on terms no less favorable to us than could be obtained
from unaffiliated third parties.

Relationship with IDT

   Upon the closing of this offering, IDT will own approximately 58.2% of our
capital stock. IDT owns Class A stock that has twice the voting power of our
common stock. Therefore, upon the closing of this offering, IDT will control
65.2% of our vote. Since inception, we have received various services from IDT,
including administration (accounting, human resources, legal), customer
support, telecommunications and joint marketing. IDT has also provided us with
the services of a number of its executives and employees. In consideration for
these services, IDT has historically allocated a portion of its overhead costs
related to those services to us. We believe that the amounts allocated to us
have been no greater than the expenses we would have incurred if we obtained
those services on our own or from unaffiliated third parties. Prior to the
execution of the agreements with IDT described below, none of these services
had been provided to us pursuant to any written agreement.

   We entered into a suite of agreements with IDT in May 1999, including an
assignment agreement, a separation agreement, an IDT services agreement, a
Net2Phone services agreement, a tax sharing and indemnification agreement, a
joint marketing agreement and an Internet/telecommunications agreement.

  Assignment Agreement

   In connection with this agreement, IDT assigned to us certain proprietary
products, information, patent applications, trademarks and related intellectual
property rights used in connection with our business. IDT also licensed to us
certain proprietary business information that relates to our business. We
licensed back to IDT certain software that IDT will use in connection with its
business.

  IDT Services Agreement

   In connection with this agreement, IDT will continue to provide us with
various administrative services, including general accounting services, payroll
and benefits administration and customer support.

  .  General Accounting Services. IDT will provide us with accounts payable
     services and general ledger services. IDT will charge us cost plus 20%
     for these services. This portion of the IDT services agreement may be
     cancelled by either party on 30-days prior written notice and may be
     renewed by mutual agreement of the parties.

  .  Payroll and Benefits Administration. IDT will administer our payroll.
     Until we terminate this agreement or establish our own benefit plan for
     our employees, our employees will continue to be covered under IDT's
     health insurance policies. We will pay IDT for administering our payroll
     and benefits plans at IDT's cost plus 20%. Additionally, we will
     reimburse IDT for the employer's cost of health insurance attributable
     to each of our employees participating in IDT's group health insurance
     plan and for any other direct costs attributable to our employees'
     participation in IDT's benefit plans.

  .  Customer Support. IDT has agreed to provide customer support services to
     our customers on a cost-plus 20% basis.

   In the event we request additional services from IDT and IDT agrees to
provide those services, we will enter into an addendum to the IDT Services
Agreement covering those services. We will negotiate in good faith any fees
payable to IDT for those additional services.

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  Net2Phone Services Agreement

   In connection with this agreement, we will support IDT's debit card
platform, provide technical support for the debit card platform, order lines to
handle calls, manage the debit card database and monitor the network, 24 hours
per day, seven days per week. We will provide these services at the greater of
cost-plus 20% and $.0025 per minute of IDT usage of the debit card platform. In
addition, IDT will reimburse us for all of our direct costs in connection with
the acquisition, maintenance or support of any and all additional or
replacement equipment needed for the debit card platform.

   The Net2Phone services agreement has an initial term of one year, which
automatically renews for subsequent one-year periods unless one party gives the
other 30-days prior written notice. In addition, following the initial term,
the Net2Phone services agreement may be terminated at any time at either
party's option upon 30-days prior written notice.

   In the event IDT requests services in addition to those described in the
Net2Phone services agreement and we agree to provide those services, we will
enter into an addendum to the Net2Phone services agreement covering those
services. We will negotiate in good faith any fees payable to us for those
additional services.

  Tax Sharing and Indemnification Agreement.

   In connection with this agreement, IDT and Net2Phone will share certain past
tax liabilities and benefits, including:

  .  the allocation and payment of taxes for periods during which we and our
     subsidiaries, if any, were included in the same consolidated group with
     IDT for federal income tax purposes, and are, or were, included in the
     same consolidated, combined or unitary returns for state, local or
     foreign tax purposes;

  .  the allocation of responsibility for the filing of tax returns;

  .  the conduct of tax audits and the handling of tax controversies; and

  .  various related matters.

   For periods during which we and our subsidiaries, if any, were or are
included in IDT's consolidated federal income tax returns or state, local or
foreign consolidated, combined, or unitary tax returns, we are required to pay
an amount of tax equal to the amount we would have paid had we and our
subsidiaries, if any, had filed a tax return as a separate affiliated group of
corporations filing a consolidated federal income tax return or state, local or
foreign consolidated, combined, or unitary tax returns. We are responsible for
our own separate tax liabilities that are not determined on a consolidated or
combined basis with IDT.

   As a result of leaving the IDT consolidated group, certain tax attributes of
the IDT group attributable to our operations, such as net operating loss
carryforwards, may be allocated to us. The tax sharing and indemnification
agreement obligates us, where permitted by law, to elect to carry any post-
deconsolidation losses forward, rather than to carry back such losses to tax
years when we were included in the IDT consolidated or combined returns.

   We were included in IDT's consolidated group for federal income tax purposes
from our incorporation in October 1997 until May 1999 when we concluded the
sale of our Series A convertible preferred stock. Each corporation that is a
member of a consolidated group during any portion of the group's tax year is
jointly and severally liable for the federal income tax liability of the group
for that year. While the tax sharing and indemnification agreement allocates
tax liabilities between us and IDT during the period on or prior to the closing
date of this offering, in which we are included in IDT's consolidated group, we
could be liable in the event federal tax liability allocated to IDT is
incurred, but not paid, by IDT or any other member of

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<PAGE>


IDT's consolidated group for IDT's tax years that include such periods. In such
event, we would be entitled to seek indemnification from IDT pursuant to the
tax sharing and indemnification agreement.

  Joint Marketing Agreement.

   In connection with this agreement, we agreed to:

  .  continue to offer links to the other's Web site;

  .  cross-sell one another's products, including through their promotional
     materials and customer services representatives; and

  .  undertake additional promotions as to which the parties shall agree from
     time to time.

   IDT will pay to us a fee of $8.00 for each of our customers who becomes a
new customer of IDT as a result of our referral. We will pay IDT a fee of $8.00
for each customer of IDT who becomes a new customer of ours as a result of an
IDT referral. However, in either case, these fees will be payable only with
respect to any new customer who incurs and pays $50.00 or more in charges.

   The joint marketing agreement has an initial term of one year, which
automatically renews for subsequent one-year periods unless one party gives the
other party 60-days prior written notice. In addition, following the initial
term, the joint marketing agreement may be terminated at any time at either
party's option upon 60-days prior written notice.

  Internet/Telecommunications Agreement.

   IDT has granted us an indefeasible right to use portions of its current
high-speed network. We have the right to terminate portions of the existing
network to the extent that the existing network is replaced, the underlying
leases expire or at anytime with IDT's consent. We are obligated to reimburse
IDT for all termination or cancellation charges which it incurs. We have agreed
to pay IDT $60,000 per month for the right to use those portions of its
existing network. This amount will be reduced as IDT terminates portions of the
existing network at our request. IDT also granted us an indefeasible right to
use portions of a new DS3 Network, which it will have the right to use for 20
years. This grant will be effective as construction of this new network is
completed and delivered to IDT. This network has been pledged by IDT to the
lenders under a credit facility. We have agreed to pay IDT an installation fee
of $600,000 for this network, which we will pay as each portion of the new
network is delivered. We also will reimburse IDT for the one-time fee of
approximately $6.0 million payable in monthly installments over a five-year
period, with interest of 9% per annum. We will reimburse IDT for all of
maintenance and upgrade costs incurred by IDT with respect to those portions of
the network that we use.

   Further, IDT has granted us a right to use IDT's equipment and other assets
at its backbone points of presence and its network operations center for a two-
year period. We will pay IDT an aggregate of $1.2 million for this right over
the two-year period. At the end of the two-year period, we have the right to
purchase any of this equipment then owned by IDT at fair market value. We must
pay for all repairs, maintenance and upgrades of equipment and other facilities
we use pursuant to this agreement.

   IDT also has agreed to enter into transit relationship agreements with us
giving us access substantially identical to IDT's at five different core
locations for a period of one year commencing May 1999. Following the initial
term, the transit relationship agreements may be terminated at any time at
either party's option upon 60-days prior written notice.

   IDT retains primary control over the equipment covered by this agreement but
may require assistance from us in gaining Internet access. We have agreed to
assist in facilitating access for a one-year period commencing May 1999. For
each month during the effectiveness of the agreement, IDT will pay us:

  .  $1.00 for each of IDT's dial-up Internet customers;

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<PAGE>


  .  for each dedicated-line Internet customer, the lesser of $100.00 or 20%
     of the fee IDT charges; and

  .  25% of all fees charged by IDT for installation of dedicated lines.

Following the initial one year term, this agreement automatically renews for
one-year periods unless one party gives the other 60-days prior written notice
of termination.

  Separation Agreement

   The separation agreement with IDT provides for the following:

  .  Releases. This agreement provides for mutual general releases between us
     and IDT for alleged liability to the date of the agreement, with certain
     limited exceptions, including:

    .  liability specifically excluded by any of the other agreements
       between us and IDT, and

    .  liability for unpaid amounts for products or services or refunds
       owing on products or services due on a value-received basis for work
       done by one party at the request or on behalf of the other.

  .  Indemnification by Net2Phone. We have agreed to indemnify IDT and each
     of IDT's directors, officers and employees from all liabilities relating
     to, arising out of or resulting from:

    .  our failure or the failure of any other person to pay, perform or
       otherwise promptly discharge any of our liabilities in accordance
       with their respective terms, and

    .  any breach by us of the agreements between us and IDT.

  .  Indemnification by IDT. IDT has agreed to indemnify us and each of our
     directors, officers and employees from all liabilities relating to,
     arising out of or resulting from:

    .  the failure of IDT or any other person to pay, perform or otherwise
       promptly discharge any liabilities of IDT other than our
       liabilities, and

    .  any breach by IDT of the agreements between us and IDT.

  .  Dispute Resolution. We will attempt to resolve disputes by referring
     controversial matters to senior management (or other mutually agreed
     upon) representatives of the parties. If these efforts are not
     successful, either party may submit the dispute to mandatory, binding
     arbitration. This agreement contains procedures that are intended to
     expedite dispute resolution, including the selection of an arbitrator
     and certain limitations on discovery. In the event that any dispute may
     be in excess of $5.0 million, or in the event that an arbitration award
     in excess of $5.0 million is issued, either party may submit the dispute
     to a court of competent jurisdiction. If the parties disagree that the
     amount in controversy is in excess of $5.0 million, the parties are
     required to submit the disagreement to arbitration.

  .  Noncompetition; Certain Business Transactions. For a period of 36 months
     commencing May 1999, IDT may not directly or indirectly, engage in the
     provision of or developmental efforts related to Internet telephony
     services and voice enabling Web applications anywhere in the world or
     become a stockholder, partner or owner of any entity that is engaged in
     such business anywhere in the world. However, subject to our approval,
     which may not be unreasonably withheld, IDT may acquire a passive
     interest of up to 20% in such entity so long as IDT does not assist that
     entity in developing an Internet telephony business or otherwise
     engaging in our business. Neither we nor IDT will have any duty to
     communicate or offer any corporate opportunity to the other party and
     may pursue or acquire any such opportunity for itself or direct such
     opportunity to any other person.

  Expenses

   We have agreed to pay all third-party costs, fees and expenses relating to
this offering, all of the reimbursable expenses of the underwriters pursuant to
the underwriting agreement, all of the costs of

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producing, printing, mailing and otherwise distributing this prospectus, as
well as the underwriters' discount as provided in the underwriting agreement.
See "Underwriting." Except as expressly set forth in the agreements between us
and IDT, whether or not this offering is consummated, each party shall bear its
own respective third-party fees, costs and expenses paid or incurred in
connection with this offering.

  Payable to IDT.

   Since inception, IDT has provided the funds to finance our operations in the
form of advances (approximately $22.0 million as of April 30, 1999, of which we
repaid $8.0 million in May 1998). These advances have been converted into a
note that is payable in 60 monthly installments of principal and interest. $7.0
million of the proceeds of this offering will be used to prepay a portion of
the note. The balance of the note is payable in 60 monthly installments of
principal and interest at a rate of 9% per annum.

Relationship with Other Investors

  Series A Subscription Agreements

   Pursuant to Series A Subscription Agreements, dated as of May 13, SOFTBANK
Technology Ventures IV, GE Capital Equity Investments, America Online, Access
Technology Partners, Hambrecht & Quist and its affiliates and BT Alex. Brown
and its affiliates, purchased from us, in the aggregate, 3,140,000 shares of
Series A convertible preferred stock and warrants to purchase 180,000 shares of
our common stock, which expire upon the closing of this offering, for a net
aggregate purchase price of $29.9 million. Additionally, a warrant to purchase
92,400 shares of our common stock was issued to Hambrecht & Quist as part of
its fee as placement agent with respect to the sale of our Series A convertible
preferred stock. This warrant expires upon the closing of this offering. In
connection with the subscription agreements, we also entered into a
registration rights agreement and a stockholders agreement, each of which is
described below.

  Registration Rights Agreement

   The Series A investors acquired the following registration rights:

  .  one demand for registration at any time on or after the earlier to occur
     of the second anniversary of the Series A offering or 180 days following
     the consummation of this offering. This demand registration right may be
     made by one or more holders of the Series A convertible preferred stock
     that own at least 50% of the shares of Class A stock into which the
     Series A convertible preferred stock converts. If our board of directors
     determines in good faith that the demand registration would be
     materially detrimental to us, we are entitled to postpone the filing of
     the registration statement otherwise required to be prepared and filed
     by us for a reasonable period of time, not to exceed 90 days;

  .  piggyback registration rights if we propose to register any securities
     under the Securities Act in connection with any offering of our
     securities other than a registration statement on Form S-8 or Form S-4,
     subject to quantity limitations determined by underwriters if the
     offering involves an underwriting; and

  .  two demand registrations at any time after we become eligible to
     register our securities on Form S-3 (or any successor form). Holders
     that beneficially own at least 20% of the shares of Class A stock into
     which the Series A convertible preferred stock converts may make these
     demands.

   We agreed to pay all reasonable expenses incurred in connection with any
registration, filing or qualification pursuant to the Registration Rights
Agreement. We also agreed, to the extent permitted by law, to indemnify the
Series A investors against some liabilities in connection with the offering of
the shares, including liabilities arising under the Securities Act.

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<PAGE>

   Stockholders Agreement

   IDT and Clifford M. Sobel, our Chairman and President, agreed to vote all of
their shares in favor of the election of a director nominated by SOFTBANK
Technology Ventures IV and a director nominated by GE Capital Equity
Investments or NBC, in each case for as long as either entity holds a majority
of the shares of Series A convertible preferred stock originally purchased by
them or the shares into which they are convertible.

   In addition, each Series A convertible investor agreed to a lock up with
respect to their shares for a period of 180 days following this offering. The
Series A investors, IDT and Mr. Sobel also agreed not to transfer any of their
shares to any of our competitors for a period of 36 months, and thereafter only
subject to our right of first refusal. However, the stockholders agreement does
permit transfers between Series A investors.

 Agreements with NBC

   We signed an agreement with NBC on June 25, 1999 to purchase $1.5 million in
television advertising time on the NBC television network. We also have the
right to purchase additional spots to be telecast prior to June 30, 2000.
Additionally, on May 18, 1999, we signed a non-binding letter of intent with
NBC Multimedia, an affiliate of NBC. This letter of intent contemplates a one-
year agreement whereby we will pay NBC Multi-Media $280,000 in exchange for the
integration of our services into the NBC.com and NBC Interactive Neighborhood
Web sites.

 Agreements with Netscape

   We signed a series of related agreements with Netscape on January 31, 1999,
allowing us to embed our software and services in future versions of Netscape's
Internet browsers. The two-year term of our exclusive arrangement with Netscape
commences with the beta release of the next version of Netscape's Internet
browser, which we believe will occur later this year. In addition, our services
will be displayed on Netscape Netcenter and bundled with Netscape's suite of
software and software updates. We also have a right to place advertisements on
Netscape's Web site. In exchange, we will pay Netscape one-time licensing fees,
a percentage of revenue generated by calls provided through our co-branded
service and a percentage of advertising revenue generated by a co-branded Web
page.

 Agreement with Snap

   We entered into an agreement with Snap on May 17, 1999. Snap will
strategically display links to our Web site and services on its Snap.com Web
site. In addition, we are their preferred provider of PC-to-phone services
during the two-year term of this agreement. Snap also will deliver a preset
minimum number of impressions on its site and agreed to give us the right to a
certain amount of online advertising, subject to certain conditions. In
exchange, we agreed to pay Snap a one-time fee, a percentage of revenue
generated through their site and bonus payments for customers delivered by Snap
after meeting certain quotas.

Facility Leases

   We have entered into leases for the use of our Hackensack facilities with
corporations that are owned and controlled by Howard S. Jonas, a member of our
board of directors and a director of IDT. Additionally, Mr. Jonas, together
with a number of entities formed for the benefit of charities and members of
his family, owns shares of IDT's capital stock that enable him to vote more
than 50% of IDT'S capital stock. As a result, he may be deemed to be the
beneficial owner of the shares of Net2Phone capital stock owned by IDT. The two
Hackensack leases run for three-year terms, beginning on March 1, 1999 with
monthly rent of $5,600 for 294-298 State Street and $9,912 for 171-173 Main
Street. We have also entered into a sublease with IDT for our Piscataway
facility, which is leased by IDT from a corporation owned and controlled by Mr.
Jonas. The Piscataway sublease runs for a three-year term, beginning in May
1999, with monthly rent of $8,400.

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Officer Loans

   In May 1999, Howard S. Balter, Ilan M. Slasky, David Greenblatt, Martin
Rothberg, H. Jeff Goldberg, Jonathan Reich, and Jonathan Rand, each of whom is
an executive officer, borrowed $1,447,240, $352,800, $352,800, $352,800,
$352,800, $98,000 and $44,100, respectively, from us. All of the proceeds of
these loans were used to purchase shares of Net2Phone common stock upon the
exercise of stock options. The loans bear interest at the rate of 7.0% per
annum, and will mature in May 2001. As a condition to receiving these loans,
these officers agreed to surrender their respective right to exercise 8,862,
2,160, 2,160, 2,160, 2,160, 600 and 270 immediately exercisable options,
respectively.

Relationship with Law Firm

   Ira A. Greenstein, our General Counsel and Secretary, and Raphael S.
Grunfeld, a director nominee, are partners of the law firm Morrison & Foerster
LLP, which has provided legal services to us and to IDT and its subsidiaries
since December 1996, and in connection with this offering.

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                          DESCRIPTION OF CAPITAL STOCK

Authorized Capital Stock

   Our certificate of incorporation, as amended and restated, authorizes
247,042,089 shares of capital stock consisting of:

   .  6,850,000 shares of preferred stock, $0.01 par value;

   .  3,150,000 shares of Series A convertible preferred stock, $0.01 par
value;

   .  37,042,089 shares of Class A stock, $0.01 par value; and

   .  200,000,000 shares of common stock, $0.01 par value.

   Of the shares of common stock, 4,800,000 shares of our common stock are
being offered through this prospectus. Immediately following the closing of the
offering, 10,161,429 shares of common stock and 36,636,190 shares of Class A
stock will be outstanding.

   As of June 25, 1999, there were 17 holders of our Series A convertible
preferred stock, one holder of our Class A stock and 33 holders of our common
stock.

Common Stock and Class A Stock

   General. The rights of holders of common stock and holders of Class A stock
are identical, except for voting rights, conversion rights and restrictions on
transferability. As of June 25, 1999, there were 4,683,129 shares of common
stock outstanding and 27,622,089 shares of Class A stock outstanding. An
additional 9,420,000 shares of Class A stock are issuable upon conversion of
our outstanding Series A convertible preferred stock.

   Voting Rights. The holders of Class A stock are entitled to two votes per
share and the holders of common stock are entitled to one vote per share.
Except as otherwise required by law or as described below, holders of Class A
stock and common stock will vote together as a single class on all matters
presented to the stockholders for their vote or approval, including the
election of directors. Stockholders are not entitled to vote cumulatively for
the election of directors, and no class of outstanding capital stock acting
alone is entitled to elect any directors. IDT will hold 58.2% of our Class A
stock upon consummation of this offering. Accordingly, IDT will retain
effective control of us through holding approximately 65.2% of the combined
voting power of our outstanding capital stock. Therefore, IDT has the ability
to elect all of our directors and to effect or prevent certain corporate
transactions which require majority approval of the combined classes, including
mergers and other business combinations.

   Transfer Restrictions. Class A stock is subject to certain limitations on
transferability that do not apply to the common stock. Our certificate of
incorporation provides that shares of Class A stock automatically convert into
an equal number of shares of common stock if there is a transfer of shares of
Class A stock to a person other than a permitted transferee. Thereafter, such
shares of common stock may be freely transferred, subject to restrictions
imposed under applicable securities laws. Shares of Class A stock acquired by
us will be canceled and may not be reissued.

   Dividends and Liquidation. Holders of Class A stock and holders of common
stock have an equal right to receive dividends when and if declared by the
board of directors out of legally available funds. In the event of a
liquidation, dissolution or winding up, holders of the shares of Class A stock
and common stock are entitled to share equally, share-for-share, in the assets
available for distribution after payment of all creditors and the liquidation
preferences of our preferred stock.

   Optional Conversion Rights. Each share of Class A stock may, at any time and
at the option of the holder, be converted into one fully paid and non-
assessable share of common stock. Upon conversion, such shares of common stock
would not be subject to restrictions on transfer that applied to the shares of
Class A

                                       60
<PAGE>

stock prior to conversion except to the extent such restrictions are imposed
under applicable securities laws. The shares of common stock are not
convertible into or exchangeable for shares of Class A stock or any other
shares or securities.

   Other Provisions. Holders of Class A stock and common stock have no
preemptive rights to subscribe to any additional securities of any class which
we may issue and there are no redemption provisions or sinking fund provisions
applicable to either such class, nor is the Class A stock or the common stock
subject to calls or assessments by us. The rights, preferences, and privileges
of the holders of common stock and Class A stock are subject to and may be
adversely affected by, the rights of the holders of any series of preferred
stock.

Preferred Stock

   Our certificate of incorporation provides that we may issue up to 10,000,000
shares of preferred stock in one or more series as may be determined by our
board of directors who may establish the number of shares to be included in
each such series, fix the designation, powers, preferences and relative rights
of the shares of each such series and any qualifications, limitations, or
restrictions thereof, and increase or decrease the number of shares of any such
series without any further vote or action by the stockholders. The board of
directors may authorize, without stockholder approval, the issuance of
preferred stock with voting and conversion rights that could adversely affect
the voting power and other rights of holders of common stock or Class A stock.
Preferred stock could be issued quickly with terms designated to delay or
prevent a change in our control or to make the removal of management more
difficult. This could have the effect of decreasing the market price of the
common stock. In May 1999, we sold 3,140,000 shares of Series A convertible
preferred stock pursuant to Series A Subscription Agreements. All shares of the
Series A convertible preferred stock will automatically convert into 9,420,000
shares of our Class A stock at the closing of this offering.

   We believe that the ability of the board to issue one or more series of
preferred stock will provide us with flexibility in structuring possible future
financings and acquisitions, and in meeting other corporate needs that might
arise. The authorized shares of preferred stock, as well as shares of common
stock, will be available for issuance without further action by our
stockholders, unless such action is required by applicable law or the rules of
any stock exchange or automated quotation system on which our securities may be
listed or traded.

   Although the board has no intention at the present time of doing so, it
could issue a series of preferred stock that could, depending on the terms of
such series, impede the completion of a merger, tender offer or other takeover
attempt. The board will make any determination to issue such shares based on
its judgment as to our best interests and the best interests of our
stockholders. The board could issue preferred stock having terms that could
discourage an acquisition attempt through which an acquirer may be able to
change the composition of the board, including a tender offer or other
transaction that some, or a majority, of our stockholders might believe to be
in their best interests or in which stockholders might receive a premium for
their stock over the then current market price.

   Certain Anti-Takeover Effects. Certain provisions of the certificate of
incorporation and bylaws, summarized in the following paragraphs, may be
considered to have an anti-takeover effect and may delay, deter or prevent a
tender offer, proxy contest or other takeover attempt that a stockholder might
consider to be in such stockholder's best interest, including such an attempt
that might result in payment of a premium over the market price for shares held
by stockholders.

   The certificate of incorporation and bylaws provide for the board of
directors to be divided into three classes of directors serving staggered
three-year terms upon the consummation of this offering. As a result,
approximately one-third of the board of directors will be elected each year.
Classification of the board of directors expands the time required to change
the composition of a majority of directors and may tend to

                                       61
<PAGE>

discourage a proxy contest or other takeover bid for us. Moreover, under the
Delaware General Corporation Law, in the case of a corporation having a
classified board of directors, the stockholders may remove a director only for
cause.

   The certificate of incorporation provides that a special meeting of
stockholders may be called by any of the following:

    .  the chairman of our board;

    .  our president;

    .  any of our vice presidents; or

    .  our secretary.

   In addition, a special meeting of stockholders may be called by any such
officer at the written request of a majority of the board of directors or at
the written request of stockholders owning a majority of our capital stock
issued and outstanding and entitled to vote.

   Section 203 of the Delaware General Corporation Law provides that, subject
to certain exceptions specified therein, an "interested stockholder" of a
Delaware corporation shall not engage in any business combinations, including
mergers or consolidations or acquisitions of additional shares of the
corporation, with the corporation for a three-year period following the date
that such stockholder becomes an interested stockholder unless:

    .  prior to such date, the board of directors of the corporation
       approved either the business combination or the transaction that
       resulted in the stockholder becoming an interested stockholder;

    .  upon consummation of the transaction that resulted in the
       stockholder becoming an "interested stockholder," the interested
       stockholder owned at least 85% of the voting stock of the
       corporation outstanding at the time the transaction commenced
       (excluding certain shares); or

    .  on or subsequent to such date, the business combination is approved
       by the board of directors of the corporation and authorized at an
       annual or special meeting of stockholders by the affirmative vote of
       at least 66.67% of the outstanding voting stock that is not owned by
       the interested stockholder.

Except as otherwise specified in Section 203 of the Delaware General
Corporation Law, an interested stockholder is defined to include (x) any person
that owns (or, within the prior three years, did own) 15% or more of the
outstanding voting stock of the corporation, or is an affiliate or associate of
the corporation and was the owner of 15% or more of the outstanding voting
stock of the corporation at any time within three years immediately prior to
the date of determination and (y) the affiliates and associates of any such
person.

   Under certain circumstances, Section 203 of the Delaware General Corporation
Law makes it more difficult for a person who would be an interested stockholder
to effect various business combinations with a corporation for a three-year
period. We have not elected to be exempt from the restrictions imposed under
Section 203 of the Delaware General Corporation Law. However, IDT and its
affiliates are excluded from the definition of "interested stockholder"
pursuant to the terms of Section 203 of the Delaware General Corporation Law.
The provisions of Section 203 of the Delaware General Corporation Law may
encourage persons interested in acquiring us to negotiate in advance with the
board, since the stockholder approval requirement would be avoided if a
majority of the directors then in office approves either the business
combination or the transaction which results in any such person becoming an
interested stockholder. Such provisions also may have the effect of preventing
changes in our management. It is possible that such provisions could make it
more difficult to accomplish transactions that our stockholders may otherwise
deem to be in their best interests.

                                       62
<PAGE>

Liability of Directors; Indemnification

   The certificate of incorporation contains a provision that is designed to
limit directors' liability to the extent permitted by the Delaware General
Corporation Law. Specifically, directors will not be held liable
to us or our stockholders for monetary damages for any breach of fiduciary duty
as a director, except for liability as a result of:

    .  any breach of the duty of loyalty to us or our stockholders;

    .  actions or omissions not in good faith or which involve intentional
       misconduct or a knowing violation of law;

    .  payment of an improper dividend or improper repurchase of our stock
       under Section 174 of the Delaware General Corporation Law; or

    .  actions or omissions pursuant to which the director received an
       improper personal benefit.

   The principal effect of the limitation of liability provision is that a
stockholder is unable to prosecute an action for monetary damages against a
director of ours unless the stockholder can demonstrate one of the specified
bases for liability. The provision, however, does not eliminate or limit
director liability arising in connection with causes of action brought under
the federal securities laws. The certificate of incorporation does not
eliminate a director's duty of care. The inclusion of this provision in the
certificate of incorporation may discourage or deter stockholders or management
from bringing a lawsuit against directors for a breach of their fiduciary
duties, even though such an action, if successful, might otherwise have
benefited us and our stockholders. This provision should not affect the
availability of equitable remedies such as injunction or rescission based upon
a director's breach of the duty of care.

   The bylaws also provide that we will indemnify our directors and officers,
and may indemnify any of our employees and agents, to the fullest extent
permitted by Delaware law. We are generally required to indemnify our directors
and officers for all judgments, fines, penalties, settlements, legal fees and
other expenses incurred in connection with pending, threatened or completed
legal proceedings because of the director's or officer's position with us or
another entity that the director or officer serves at our request, subject to
certain conditions, and to advance funds to its directors and officers to
enable them to defend against such proceedings.

   At present, there is no pending or threatened litigation or proceeding
involving any director or officer, employee or agent of ours where such
indemnification will be required or permitted.

Transfer Agent and Registrar

   American Stock Transfer & Trust Company will be the transfer agent and
registrar for the common stock.

                        SHARES ELIGIBLE FOR FUTURE SALE

   Of the 10,161,429 shares of common stock and 36,636,190 shares of Class A
stock to be outstanding on the closing of the offering (10,881,429 shares of
common stock if the underwriters exercise their over-allotment option in full),
the 4,800,000 shares of common stock sold in the offering (5,520,000 shares if
the underwriters exercise their over-allotment option in full) will be freely
tradable without restriction under the Securities Act of 1933, except for any
such shares which may be acquired by an affiliate of ours, as that term is
defined in Rule 144 promulgated under the Securities Act of 1933. On the
closing of the offering, IDT will own 27,216,297 shares of Class A stock, which
will constitute 58.2% of our outstanding capital stock (57.3% if the
underwriters exercise their over-allotment option in full).

                                       63
<PAGE>

   Persons who are affiliates of ours will be permitted to sell the shares of
common stock that are issued in the offering only pursuant to an effective
registration statement under the Securities Act of 1933 or an exemption from
the registration requirements of the Securities Act of 1933, including
exemptions provided by Rule 144 of the Securities Act of 1933.

   Upon closing of this offering, we intend to file a registration statement
for the resale of 11,040,000 shares of common stock that are authorized for
issuance under our stock option plan. We expect this registration statement to
become effective immediately upon filing. Shares issued pursuant to our stock
option plan after the effective date of this registration statement (other than
shares issued to our affiliates) generally will be freely tradable without
restriction or further registration under the Securities Act of 1933. As of the
date of this prospectus, options to purchase 5,040,000 shares of common stock
under our stock option plan have been granted, of which 1,375,218 have been
exercised. See "Management--1999 Stock Incentive Plan" for a more complete
description of our employee benefit plans.

   The shares of capital stock held by IDT are deemed "restricted securities"
as defined in Rule 144 of the Securities Act of 1933, and may not be sold other
than through registration under the Securities Act of 1933 or pursuant to an
exemption from the regulations thereunder, including exceptions provided by
Rule 144 of the Securities Act of 1933. Subject to applicable law and to the
contractual restriction with the underwriters described below, IDT may sell any
and all of the shares of capital stock it owns after completion of the
offering. We, along with each of our security-holders, our directors and
executive officers, IDT and the Series A investors have agreed, for a period of
180 days after the date of this prospectus, not to offer or sell any shares of
Class A stock or common stock, subject to limited exceptions, without the prior
written consent of Hambrecht & Quist LLC. IDT's shares of our capital stock are
pledged as collateral to secure a credit facility. If IDT defaults in its
obligations under the pledge agreement, then a third party could acquire the
pledged stock and would not be subject to these agreements. See "Underwriting."


   Upon closing of this offering, the holders of 9,420,000 shares of our Class
A stock, or their transferees, will be entitled to request that we register
their shares under the Securities Act. See "Certain Transactions--Relationship
with Other Investors--Registration Rights Agreement."

                                       64
<PAGE>

                                  UNDERWRITING

   Subject to the terms and conditions of the Underwriting Agreement, the
underwriters named below, through their representatives, Hambrecht & Quist LLC,
BT Alex. Brown Incorporated and Bear, Stearns & Co. Inc., have severally agreed
to purchase from Net2Phone the following respective number of shares of common
stock:

<TABLE>
<CAPTION>
                                                    Number of
           Name                                      Shares
           ----                                     ---------
           <S>                                      <C>
           Hambrecht & Quist LLC...................
           BT Alex. Brown Incorporated.............
           Bear, Stearns & Co. Inc.................

                                                    ---------
           Total................................... 4,800,000
                                                    =========
</TABLE>

   The underwriting agreement provides that the obligations of the underwriters
are subject to certain conditions precedent, including the absence of any
material adverse change in our business and the receipt of certain
certificates, opinions and letters from us, our counsel and the independent
auditors. The underwriters are committed to purchase all of the shares of
common stock offered by us if they purchase any shares.

   The following table shows the per share and total underwriting discounts and
commissions we will pay to the underwriters. Such amounts are shown assuming
both no exercise and full exercise of the underwriters' over-allotment option
to purchase additional shares.

                     Underwriting Discounts and Commissions

<TABLE>
<CAPTION>
                                                        With         Without
                                                   Over-Allotment Over-Allotment
                                                      Exercise       Exercise
                                                   -------------- --------------
      <S>                                          <C>            <C>
      Per Share...................................    $              $
      Total.......................................    $              $
</TABLE>

   We estimate that the total expenses of this offering, excluding underwriting
discounts and commissions, will be approximately $1.5 million.

   The underwriters propose to offer the shares of common stock directly to the
public at the initial public offering price set forth on the cover page of this
prospectus and to certain dealers at that price less a concession not in excess
of $    per share. The underwriters may allow and such dealers may reallow a
concession not in excess of $    per share to certain other dealers. After the
initial public offering of the shares, the offering price and other selling
terms may be changed by the underwriters.

   We have granted to the underwriters an option, exercisable no later than 30
days after the date of this prospectus, to purchase up to 720,000 additional
shares of common stock at the initial public offering price, less the
underwriting discount set forth on the cover page of this prospectus. To the
extent that the underwriters exercise this option, each of the underwriters
will have a firm commitment to purchase approximately the same percentage
thereof which the number of shares of common stock to be purchased by it shown
in the above table bears to the total number of shares of common stock offered
hereby. We will be obligated, pursuant to the option, to sell shares to the
underwriters to the extent the option is exercised. The underwriters may
exercise this option only to cover over-allotments made in connection with the
sale of shares of common stock offered by us.

                                       65
<PAGE>

   The offering of the shares is made for delivery when, as and if accepted by
the underwriters and subject to prior sale and to withdrawal, cancellation or
modification of the offering without notice. The underwriters reserve the right
to reject an order for the purchase of shares in whole or in part.

   We have agreed to indemnify the underwriters against certain liabilities,
including liabilities under the Securities Act, and to contribute to payments
the underwriters may be required to make in respect of these liabilities.

   All of our security-holders, including the Series A investors, IDT, and our
executive officers and directors have agreed that they will not, without the
prior written consent of Hambrecht & Quist LLC, offer, sell or otherwise
dispose of any shares of capital stock, options or warrants to acquire shares
of capital stock or securities exchangeable for or convertible into shares of
capital stock owned by them for a period of 180 days following the date of this
prospectus. We have agreed that we will not, without the prior written consent
of Hambrecht & Quist LLC, offer, sell or otherwise dispose of any shares of
capital stock, options or warrants to acquire shares of capital stock or
securities exchangeable for or convertible into shares of capital stock for a
period of 180 days following the date of this prospectus, except that we may
issue shares upon the exercise of options and warrants granted prior to the
date hereof, and may grant additional options under our stock option plans.
Without the prior written consent of Hambrecht & Quist LLC, any additional
options granted shall not be exercisable during this 180-day period.

   Certain persons participating in this offering may over-allot or effect
transactions which stabilize, maintain or otherwise affect the market price of
the common stock at levels above those which might otherwise prevail in the
open market, including by entering stabilizing bids, effecting syndicate
covering transactions or imposing penalty bids. A stabilizing bid means the
placing of any bid or effecting of any purchase, for the purpose of pegging,
fixing or maintaining the price of the common stock. A syndicate covering
transaction means the placing of any bid on behalf of the underwriting
syndicate or the effecting of any purchase to reduce a short position created
in connection with the offering. A penalty bid means an arrangement that
permits the underwriters to reclaim a selling concession from a syndicate
member in connection with the offering when shares of common stock sold by the
syndicate member are purchased in syndicate covering transactions. Such
transactions may be effected on the Nasdaq National Market, in the over-the-
counter market, or otherwise. Such stabilizing, if commenced, may be
discontinued at any time.

   Prior to this offering, there has been no public market for our common
stock. The initial public offering price for the common stock will be
determined by negotiations among us and the representatives. Among the factors
to be considered in determining the initial public offering price will be
prevailing market and economic conditions, our revenue and earnings, market
valuations of other companies engaged in activities similar to our business
operations and our management. The estimated initial public offering price
range set forth on the cover of this preliminary prospectus is subject to
change as a result of market conditions or other factors.

   At our request the underwriters have reserved at the initial public offering
price the number of shares of common stock that may be purchased for $3.0
million for sale to NBC. Based upon the low end of the estimated range on the
front cover of this prospectus, NBC may therefore purchase up to 300,000 shares
of our common stock. NBC has expressed an interest in purchasing these shares,
which will be subject to a lock-up agreement that it has entered into with the
underwriters, under which it agreed not to sell shares for 180 days after the
date of this prospectus. There can be no assurance that any of the reserved
shares will be purchased. The number of shares available for sale to the
general public in this offering will be reduced by the number of reserved
shares sold. Any reserved shares not so purchased will be offered to the
general public on the same basis as the other shares offered hereby.

   In addition, at our request, the underwriters have reserved up to 240,000
shares of common stock for sale at the initial public offering price to our
directors, officers, employees, business associates and related persons. The
number of shares of common stock available for sale to the general public will
be reduced if such persons purchase the reserved shares. Any reserved shares
which are not so purchased will be offered by the underwriters to the general
public on the same basis as the other shares offered hereby.

                                       66
<PAGE>

   In connection with this offering, certain underwriters and selling group
members (if any) who are qualified market makers on the Nasdaq National Market
may engage in passive market making transactions in our common stock on the
Nasdaq National Market in accordance with Rule 103 of Regulation M under the
Securities Exchange Act of 1934, as amended. In general, a passive market maker
must display its bid at a price not in excess of the highest independent bid of
such security; if all independent bids are lowered below the passive market
maker's bid, however, such bid must then be lowered when certain purchase
limits are exceeded.

   Hambrecht & Quist LLC and persons associated with Hambrecht & Quist LLC
beneficially own 20,000 shares of Series A convertible preferred stock and
warrants to purchase 92,400 shares of common stock at an exercise price of
$3.33 per share, which warrants expire upon the closing of this offering.
Additionally, Access Technology Partners, L.P., a fund of outside investors
that is managed by a subsidiary of Hambrecht & Quist California, owns 80,000
shares of Series A convertible preferred stock.

   BT Alex. Brown Incorporated and persons associated with BT Alex. Brown
Incorporated own 40,000 shares of Series A convertible preferred stock.
Additionally, Stephen A. Oxman, one of our director nominees, and a managing
director at Deutsche Bank Securities Inc., an affiliate of BT Alex. Brown
Incorporated, will receive options to purchase 10,000 shares of common stock at
the offering price upon the closing of this offering.

   Denis Bovin, Vice Chairman-Investment Banking of Bear, Stearns & Co. Inc.,
owns options to purchase 75,000 shares of common stock at an exercise price of
$3.33 per share, which expire in May 2009. Addition- ally, Mr. Bovin will
receive options to purchase 50,000 shares of common stock at the offering price
upon the consummation of this offering.

   Prior to the closing of this offering, each of Hambrecht & Quist LLC and
persons associated with it, BT Alex. Brown Incorporated and persons associated
with it, Denis Bovin and Stephen A. Oxman will enter into written agreements
with Net2Phone, whereby each of them will agree, for a period of one year from
the date of this prospectus, not to sell or otherwise transfer any shares of
capital stock, or options or warrants to purchase common stock, owned by them
that are deemed to be underwriting compensation.

   Hambrecht & Quist LLC and BT Alex. Brown Incorporated have provided
financial advisory services to Net2Phone and IDT in the past and have received
compensation at market rates for these services.

                                       67
<PAGE>

                                 LEGAL MATTERS

   Certain legal matters with respect to the validity of the common stock
offered hereby will be passed upon for us by Morrison & Foerster LLP, New York,
New York. Ira A. Greenstein, our General Counsel and Secretary, and Raphael S.
Grunfeld, one of our director nominees, are partners of Morrison & Foerster
LLP. Certain legal matters relating to this offering will be passed upon for
the underwriters by Brobeck, Phleger & Harrison LLP, New York, New York.

                                    EXPERTS

   The financial statements of Net2Phone, Inc. and, for the periods prior to
its incorporation, the Net2Phone division of IDT Corporation, July 31, 1997 and
July 31, 1998 and for the period from January 2, 1996 (date of inception) to
July 31, 1996 and the years ended July 31, 1997 and 1998, appearing in this
prospectus and registration statement have been audited by Ernst & Young LLP,
independent auditors, as set forth in their report thereon appearing elsewhere
herein, and are included in reliance upon such report given upon the authority
of such firm as experts in accounting and auditing.

                    WHERE YOU CAN FIND MORE INFORMATION

   We have filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act of 1933 with respect to the
common stock offered hereby. This prospectus does not contain all of the
information set forth in the registration statement, certain portions of which
are omitted as permitted by the rules and regulations of the Securities and
Exchange Commission. For further information pertaining to us and the common
stock to be sold in this offering, reference is made to the registration
statement, including the exhibits thereto and the financial statements, notes
and schedules filed as a part thereof. Statements contained in this prospectus
regarding the contents of any contract or other document referred to herein or
therein are not necessarily complete, and in each instance reference is made to
the copy of such contract or other document filed as an exhibit to the
registration statement or such other document, each such statement being
qualified in all respects by such reference.

   On the closing of the offering, we will be subject to the informational
requirements of the Securities Exchange Act of 1934 and will file reports,
proxy statements and other information with the Securities and Exchange
Commission. Such reports, proxy statements and other information, as well as
the registration statement and the exhibits and schedules thereto, may be
inspected, without charge, at the public reference facility maintained by the
Securities and Exchange Commission at Room 1024, Judiciary Plaza, 450 Fifth
Street, NW, Washington, D.C. 20549, and at the Securities and Exchange
Commission's regional offices located at Seven World Trade Center, New York,
New York 10048 and Northwestern Atrium Center, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661. Copies of such material may also be obtained
from the Public Reference Section of the Securities and Exchange Commission at
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. Such
materials can also be inspected on the Securities and Exchange Commission's Web
site at www.sec.gov.

                                       68
<PAGE>

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
<S>                                                                        <C>
Report of Independent Auditors............................................ F-2
Balance Sheets as of July 31, 1997 and 1998 and April 30, 1999
 (Unaudited).............................................................. F-3
Statements of Operations for the period from January 2, 1996 (date of
 inception) to July 31, 1996 and the years ended July 31, 1997 and 1998
 and the nine months ended April 30, 1998 and 1999 (Unaudited)............ F-4
Statements of Stockholders' Deficit for the period from January 2, 1996
 (date of inception) to July 31, 1996 and the years ended July 31, 1997
 and 1998 and the nine months ended April 30, 1999 (Unaudited)............ F-5
Statements of Cash Flows for the period from January 2, 1996 (date of
 inception) to July 31, 1996 and the years ended July 31, 1997 and 1998
 and the nine months ended April 30, 1998 and 1999 (Unaudited)............ F-6
Notes to Financial Statements............................................. F-7
</TABLE>

                                      F-1
<PAGE>

                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors and Stockholders
 Net2Phone, Inc.

   We have audited the accompanying balance sheets of Net2Phone, Inc. and, for
the periods prior to its incorporation, the Net2Phone division of IDT
Corporation (the "Company") as of July 31, 1997 and 1998, and the related
statements of operations, stockholders' deficit and cash flows for the period
from January 2, 1996 (date of inception) to July 31, 1996 and the years ended
July 31, 1997 and 1998. These financial statements are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

   We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

   In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of the Company at July 31,
1997 and 1998 and the results of its operations and its cash flows for the
period from January 2, 1996 (date of inception) to July 31, 1996 and the years
ended July 31, 1997 and 1998, in conformity with generally accepted accounting
principles.

                                           Ernst & Young LLP

New York, New York
May 11, 1999, except for Note 9,
the date of which is June 25, 1999

                                      F-2
<PAGE>

                                Net2Phone, Inc.

                                 BALANCE SHEETS

<TABLE>
<CAPTION>
                                                 July 31            April 30
                                         ------------------------  -----------
                                            1997         1998         1999
                                         -----------  -----------  -----------
                                                                   (Unaudited)
<S>                                      <C>          <C>          <C>
Assets
Current assets:
  Cash and cash equivalents............. $       --   $    10,074  $ 1,782,194
  Trade accounts receivable, net........      16,500    1,465,475      329,577
  Due from IDT Corporation..............         --           --       346,176
  Prepaid contract deposits.............         --           --     4,000,000
  Other current assets..................         --           --        31,051
                                         -----------  -----------  -----------
    Total current assets................      16,500    1,475,549    6,488,998
Property and equipment, net.............     899,525    5,409,061    8,228,218
Trademark, net..........................         --           --     5,000,000
Other assets............................         --        90,498      101,112
                                         -----------  -----------  -----------
    Total assets........................ $   916,025  $ 6,975,108  $19,818,328
                                         ===========  ===========  ===========
Liabilities and stockholders' deficit
Current liabilities:
  Accounts payable...................... $       --   $       --   $   248,675
  Deferred revenue......................     161,001      810,114    1,495,775
  Due to IDT Corporation................   2,960,329   11,814,988   22,000,000
                                         -----------  -----------  -----------
    Total current liabilities...........   3,121,330   12,625,102   23,744,450
Commitments and contingencies
  Redeemable convertible preferred
   stock,
   Series A, $.01 par value; authorized
   shares--
   3,150,000; no shares issued and
   outstanding..........................         --           --           --
Stockholders' deficit:
  Preferred stock, $.01 par value;
   authorized shares--6,850,000; no
   shares issued and outstanding........         --           --           --
  Common stock, $.01 par value;
   authorized shares-- 200,000,000;
   30,960,000 shares issued and
   outstanding at July 31, 1998 and
   April 30, 1999 (27,864,000 shares at
   July 31, 1997).......................         100      100,100      309,600
  Class A stock, $.01 par value;
   authorized shares    37,042,089; no
   shares issued and outstanding........         --           --           --
  Additional paid-in capital............         --           --     4,420,338
  Accumulated deficit...................  (2,205,405)  (5,750,094)  (8,656,060)
                                         -----------  -----------  -----------
    Total stockholders' deficit.........  (2,205,305)  (5,649,994)  (3,926,122)
                                         -----------  -----------  -----------
    Total liabilities and stockholders'
     deficit............................ $   916,025  $ 6,975,108  $19,818,328
                                         ===========  ===========  ===========
</TABLE>

                            See accompanying notes.

                                      F-3
<PAGE>

                                Net2Phone, Inc.

                            STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                             Period from
                           January 2, 1996
                         (date of inception)                            Nine months ended April
                             to July 31         Year ended July 31                 30
                         ------------------- -------------------------  -------------------------
                                1996            1997          1998         1998          1999
                         ------------------- -----------  ------------  -----------  ------------
<S>                      <C>                 <C>          <C>           <C>          <C>
                                                                              (Unaudited)
Revenues:
  Service revenue.......     $      --       $ 2,652,303  $ 10,490,972  $ 6,439,374  $ 21,757,721
  Product revenue.......            --               --      1,515,000    1,515,000       445,536
                             ----------      -----------  ------------  -----------  ------------
    Total revenue.......            --         2,652,303    12,005,972    7,954,374    22,203,257
Costs and expenses:
 Direct cost of
  revenue:
  Service cost of
   revenue*.............            --         1,547,443     6,576,523    3,317,065    11,787,689
  Product cost of
   revenue*.............            --             6,000       272,236      272,236        60,400
                             ----------      -----------  ------------  -----------  ------------
    Total direct cost of
     revenue*...........            --         1,553,443     6,848,759    3,589,301    11,848,089
  Selling and
   marketing............         34,468           76,724     2,887,766    1,363,060     4,746,316
  General and
   administrative.......        465,015        2,599,283     5,087,628    3,254,287     7,298,106
  Depreciation..........          8,275          120,500       726,508      421,648     1,216,712
                             ----------      -----------  ------------  -----------  ------------
    Total costs and
     expenses...........        507,758        4,349,950    15,550,661    8,628,296    25,109,223
                             ----------      -----------  ------------  -----------  ------------
Loss from operations
 before provision for
 income taxes...........       (507,758)      (1,697,647)   (3,544,689)    (673,922)   (2,905,966)
Provision for income
 taxes..................            --               --            --           --            --
                             ----------      -----------  ------------  -----------  ------------
Net loss................     $ (507,758)     $(1,697,647) $ (3,544,689) $  (673,922) $ (2,905,966)
                             ==========      ===========  ============  ===========  ============
Net loss per share--
 basic and diluted......     $    (0.02)     $     (0.06) $      (0.12) $     (0.02) $      (0.09)
                             ==========      ===========  ============  ===========  ============
Weighted average number
 of shares used in
 calculation of basic
 and diluted net loss
 per share..............     27,864,000       27,864,000    30,186,000   29,928,000    30,960,000
                             ==========      ===========  ============  ===========  ============
</TABLE>

- --------

* Excludes depreciation and amortization

                              See accompanying notes.

                                      F-4
<PAGE>

                                Net2Phone, Inc.

                      STATEMENTS OF STOCKHOLDERS' DEFICIT

 Period from January 2, 1996 (date of inception) to July 31, 1996 and the years
     ended July 31, 1997 and 1998 and the nine months ended April 30, 1999
     (unaudited with respect to the nine months ended April 30, 1999)

<TABLE>
<CAPTION>
                             Common Stock     Additional                  Total
                          -------------------  Paid-In   Accumulated  Stockholders'
                            Shares    Amount   Capital     Deficit       Deficit
                          ---------- -------- ---------- -----------  -------------
<S>                       <C>        <C>      <C>        <C>          <C>
  Net loss for the
   period January 2,
   1996 (date of
   inception) to July
   31, 1996.............         --  $    --  $      --  $  (507,758)  $  (507,758)
                          ---------- -------- ---------- -----------   -----------
Balance at July 31, 1996
 .......................         --       --         --     (507,758)     (507,758)
  Sale of Common Stock
   to IDT Corporation...  27,864,000      100        --          --            100
  Net loss for the year
   ended July 31, 1997..         --       --         --   (1,697,647)   (1,697,647)
                          ---------- -------- ---------- -----------   -----------
Balance at July 31,
 1997...................  27,864,000      100        --   (2,205,405)   (2,205,305)
  Sale of Common Stock
   to officer...........   3,096,000  100,000        --          --        100,000
  Net loss for the year
   ended
   July 31, 1998........         --       --         --   (3,544,689)   (3,544,689)
                          ---------- -------- ---------- -----------   -----------
Balance at July 31,
 1998...................  30,960,000  100,100        --   (5,750,094)   (5,649,994)
  Capital contributions
   from IDT
   Corporation..........         --   209,500  4,420,338         --      4,629,838
  Net loss for the nine
   months ended April
   30, 1999.............         --       --         --   (2,905,966)   (2,905,966)
                          ---------- -------- ---------- -----------   -----------
Balance at April 30,
 1999...................  30,960,000 $309,600 $4,420,338 $(8,656,060)  $(3,926,122)
                          ========== ======== ========== ===========   ===========
</TABLE>





                            See accompanying notes.

                                      F-5
<PAGE>

                                Net2Phone, Inc.

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                            Period from
                          January 2, 1996
                             (date of                                 Nine months ended
                            inception)      Year ended July 31             April 30
                            to July 31    ------------------------  -----------------------
                               1996          1997         1998         1998        1999
                          --------------- -----------  -----------  ----------  -----------
                                                                         (Unaudited)
<S>                       <C>             <C>          <C>          <C>         <C>
Operating activities
Net loss................     $(507,758)   $(1,697,647) $(3,544,689) $ (673,922) $(2,905,966)
Adjustments to reconcile
 net loss to net cash
 (used in) operating
 activities:
 Depreciation...........         8,275        120,500      726,508     421,648    1,216,712
 Changes in assets and
  liabilities:
   Accounts receivable..           --         (16,500)  (1,448,975)   (555,000)   1,135,898
   Due from IDT
    Corporation.........           --             --           --          --      (346,176)
   Prepaid contract
    deposits............           --             --           --          --    (4,000,000)
   Other current
    assets..............           --             --           --          --       (31,051)
   Other assets.........           --             --       (90,498)    (73,323)     (10,614)
   Accounts Payable.....           --             --           --          --       248,675
   Deferred revenue.....           --         161,001      649,113     471,524      685,661
                             ---------    -----------  -----------  ----------  -----------
Net cash (used in)
 operating activities...      (499,483)    (1,432,646)  (3,708,541)   (409,073)  (4,006,861)
Investing activities
Purchase of trademark...           --             --           --          --    (5,000,000)
Purchases of property
 and equipment..........      (182,949)      (845,351)  (5,236,044) (4,230,909)  (4,035,869)
                             ---------    -----------  -----------  ----------  -----------
Net cash used in
 investing activities...      (182,949)      (845,351)  (5,236,044) (4,230,909)  (9,035,869)
Financing activities
Proceeds from sale of
 Common Stock to IDT
 Corporation                       --             100          --          --           --
Proceeds from sale of
 Common Stock to
 officer................           --             --       100,000         --           --
Capital contributions
 from IDT Corporation...           --             --           --          --     4,629,838
Net advances from IDT
 Corporation............       682,432      2,277,897    8,854,659   4,639,982   10,185,012
                             ---------    -----------  -----------  ----------  -----------
Net cash provided by
 financing activities...       682,432      2,277,997    8,954,659   4,639,982   14,814,850
                             ---------    -----------  -----------  ----------  -----------
Net increase in cash and
 cash equivalents.......           --             --        10,074         --     1,772,120
Cash and cash
 equivalents at
 beginning of period....           --             --           --          --        10,074
                             ---------    -----------  -----------  ----------  -----------
Cash and cash
 equivalents at end of
 period.................     $     --     $       --   $    10,074  $      --   $ 1,782,194
                             =========    ===========  ===========  ==========  ===========
Supplemental disclosure
 of cash flow
 information:
Cash payments made for
 interest...............     $     --     $       --   $       --   $      --   $       --
                             =========    ===========  ===========  ==========  ===========
Cash payments made for
 income taxes...........     $     --     $       --   $       --   $      --   $       --
                             =========    ===========  ===========  ==========  ===========
</TABLE>


                              See accompanying notes.

                                      F-6
<PAGE>

                                Net2Phone, Inc.

                         NOTES TO FINANCIAL STATEMENTS

                  July 31, 1998 (unaudited with respect to the
                nine months ended April 30, 1998 and 1999)

1. Description of Business and Basis of Presentation

   The accompanying financial statements reflect the historical financial
information of Net2Phone, Inc. and, for the periods prior to its incorporation,
the Net2Phone division of IDT Corporation (the "Company"), a majority owned
subsidiary of IDT Corporation ("IDT"), incorporated in October 1997, to operate
and develop its Internet telephony business. Prior to such time, the Company's
business was conducted as a division of IDT. The Company is a leading provider
of voice-enhanced Internet communication services to individuals and
businesses.

   The Company's statements of operations include allocations of certain costs
and expenses from IDT (Note 4). Although such allocations are not necessarily
indicative of the costs that would have been incurred if the Company operated
as an unaffiliated entity, management believes that the allocation methods are
reasonable.

2. Summary of Significant Accounting Policies

Use of Estimates

   The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results may differ from those estimates.

Interim Financial Information

   The unaudited interim information as of April 30, 1999 and for the nine
months ended April 30, 1998 and 1999 has been prepared on the same basis as the
annual financial statements and, in the opinion of the Company's management,
contains all adjustments (consisting of normal recurring accruals) necessary
for a fair presentation. Operating results for any interim period are not
necessarily indicative of results to be expected for the entire year.

Revenue Recognition

   Internet telephony service revenue is recognized as service is provided.
Revenue derived from equipment sales and from services provided to IDT is
recognized upon installation of the equipment and performance of the services,
respectively. (See Note 4)

Direct Cost of Revenue

   Direct cost of revenue consists primarily of telecommunication costs,
connectivity costs, and the cost of equipment sold to customers. Direct cost of
revenue excludes depreciation and amortization.

Property and Equipment

   Equipment and furniture and fixtures are recorded at cost and depreciated
using the straight-line method over the estimated useful lives of the assets of
five years.

   Computer software is amortized using the straight-line method over the
shorter of five years or the term of the related agreement.


                                      F-7
<PAGE>

                                Net2Phone, Inc.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)

                  July 31, 1998 (unaudited with respect to the
                nine months ended April 30, 1998 and 1999)


2. Summary of Significant Accounting Policies (continued)

Advertising Costs

   The Company expenses the costs of advertising as incurred. For the years
ended July 31, 1997 and 1998 and the nine months ended April 30, 1998 and 1999,
advertising expense totaled approximately $6,000, $1,962,000, $888,000, and
$3,165,000, respectively. There was no advertising expense for the period from
January 2, 1996 (date of inception) to July 31, 1996.

Software Development Costs

   Costs for the internal development of new software products and substantial
enhancements to existing software products are expensed as incurred until
technological feasibility has been established, at which time any additional
costs would be capitalized. To date, the Company has essentially completed its
software development concurrently with the establishment of technological
feasibility and, accordingly, no such costs have been capitalized to date.
Software development costs are the Company's only research and development
expenditures. For the period from January 2, 1996 (date of inception) to July
31, 1996, software development costs of $340,000 were expensed. No software
development costs were expensed for the years ended July 31, 1997 and 1998 and
the nine months ended April 30, 1998 and 1999.

Capitalized Internal Use Software Costs

   In March 1998, the Accounting Standards Executive Committee of the AICPA
issued Statement of Position ("SOP") 98-1, Accounting for the Costs of Computer
Software Developed or Obtained for Internal Use. The SOP, which has been
adopted by the Company requires the capitalization of certain costs incurred in
connection with developing or obtaining internal use software. The Company's
policy prior to the adoption of the SOP was to capitalize substantially all
internal use software costs. Therefore, the adoption of the SOP did not have a
material effect on the Company's financial position or results of operations.
At July 31, 1997 and 1998 and April 30, 1999, the Company has capitalized
$493,000, $2,198,000 and $3,598,000, respectively, of internal use software
costs as computer software.

Cash and Cash Equivalents

   The Company considers all highly liquid investments with a maturity of three
months or less when purchased to be cash equivalents. Cash and cash equivalents
are carried at cost which approximates market value.

Trademark

   Costs associated with obtaining the right to use trademarks owned by third
parties are capitalized and amortized on a straight-line basis over the two
year term of the agreement.

Income Taxes

   The Company accounts for income taxes using the liability method. Under this
method, deferred tax assets and liabilities are determined based on differences
between the financial reporting and tax bases of assets and liabilities.

Stock Based Compensation

   The Company applies the disclosure-only provisions of SFAS No. 123,
Accounting for Stock-Based Compensation. The Company accounts for stock options
using APB Opinion No. 25, Accounting for Stock Issued to Employees and related
interpretations. Options issued to non-employees are accounted for in
accordance with SFAS No. 123.

                                      F-8
<PAGE>

                                Net2Phone, Inc.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)

                  July 31, 1998 (unaudited with respect to the
                nine months ended April 30, 1998 and 1999)


2. Summary of Significant Accounting Policies (continued)

Earnings (Loss) Per Share

   Earnings (loss) per share is calculated in accordance with FASB Statement
No. 128, Earnings per Share. Basic earnings (loss) per share is computed by
dividing the net income (loss) applicable to common shares by the weighted
average of common shares outstanding during the period. Diluted earnings (loss)
per share adjusts basic earnings (loss) per share for the effects of
convertible securities, stock options and other potentially dilutive financial
instruments, only in the periods in which such effect is dilutive. There were
no dilutive securities in any of the periods presented herein.

Current Vulnerability Due to Certain Concentrations

   Financial instruments that potentially subject the Company to concentrations
of credit risk consist principally of cash, cash equivalents, and trade
receivables. Concentrations of credit risk with respect to trade receivables
are limited due to the large number of customers comprising the Company's
customer base.

   Management regularly monitors the creditworthiness of its domestic and
international customers and believes that it has adequately provided for any
exposure to potential credit losses.

Recently Issued Financial Accounting Standards

   SFAS No. 131, Disclosure about Segments of an Enterprise and Related
Information, was issued in June 1997. The Company will be required to adopt the
new statement for the year ending July 31, 1999. This statement requires use of
the "management approach" model for segment reporting. The management approach
model is based on the way a company's management organizes segments within the
company for making operating decisions and assessing performance. Reportable
segments are based on products and services, geography, legal structure,
management structure, or any other manner in which management disaggregates a
company. The Company intends to adopt this statement in fiscal 1999 and does
not anticipate that the adoption of the statement will have significant impact
on its financial statements.

3. Property and Equipment

   Property and equipment consists of the following:

<TABLE>
<CAPTION>
                                                    July 31           April 30
                                              ---------------------  ----------
                                                1997        1998        1999
                                              ---------  ----------  ----------
     <S>                                      <C>        <C>         <C>
     Equipment............................... $ 348,625  $3,631,140  $6,094,189
     Computer software.......................   679,484   2,595,572   4,118,590
     Furniture and fixtures..................       191      37,632      87,415
                                              ---------  ----------  ----------
                                              1,028,300   6,264,344  10,300,194
     Accumulated depreciation................  (128,775)   (855,283) (2,071,976)
                                              ---------  ----------  ----------
     Property and equipment, net............. $ 899,525  $5,409,061  $8,228,218
                                              =========  ==========  ==========
</TABLE>

4. Related Party Transactions

   In May 1999, the Company and IDT entered into a separation agreement whereby
the transactions and agreements necessary to govern the relationship between
the two companies necessary to effect their separation were determined. In
accordance with such agreement, it was determined that amounts paid by IDT in
excess of $22 million would be deemed to be capital contributions.

                                      F-9
<PAGE>

                                Net2Phone, Inc.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)

                  July 31, 1998 (unaudited with respect to the
                nine months ended April 30, 1998 and 1999)


4. Related Party Transactions (continued)

   In May 1999, the Company and IDT entered into an Internet/telecommunications
agreement whereby the Company has agreed to pay IDT up to $110,000 per month
for connectivity, the use of certain computer software and equipment owned or
leased by IDT and to provide a platform for IDT's Internet services for a
monthly per customer charge. In connection with such agreement, IDT has also
granted the Company an indefeasible right, for a period of 20 years, to use a
certain telecommunications network as it is completed and delivered for up to
approximately $6.0 million.

   In May 1999, the Company and IDT entered into two one-year services
agreements whereby the Company agreed to pay IDT for certain administrative,
customer support and other services that IDT provides to it at the cost of such
services plus 20%. Also, in conjunction with such agreements, the Company has
agreed to provide IDT with certain support services for the cost of such
services plus 20%. The agreement is effective for a period of two years.

   In May 1999, the Company and IDT entered into a joint marketing agreement
whereby the companies have agreed to jointly advertise and market their
products. The agreement continues for a term of one year and is automatically
renewable for an additional one year unless terminated by either party. In
conjunction with such agreement, a commission will be earned by each company
for new customers generated by the other company as a result of such programs.

   In May 1999, the Company and IDT entered into an assignment agreement
whereby IDT assigned all of its rights in certain trademarks, patents and
proprietary products and information to the Company. These assets were
contributed at IDT's historical cost which was $0.

   The accompanying financial statements for periods prior to the signing of
the aforementioned agreements include charges by IDT to the Company for the
aforementioned services. Such charges were based principally upon the Company's
allocable portion of IDT's costs for such services. The ratios used to allocate
these costs were the Company's total payroll to IDT's total payroll and the
Company's total revenue to IDT's total revenue, depending on the type of
services provided. The allocated costs approximate the amounts that would have
been charged under the inter-company agreements if they had been in effect
during such periods.

   For the period from January 2, 1996 (date of inception) to July 31, 1996 and
the years ended July 31, 1997 and 1998 and the nine months ended April 30, 1998
and 1999, all of the Company's operations were financed by IDT.

   For the years ended July 31, 1997 and 1998 and the nine months ended April
30, 1998 and 1999, the Company recognized revenue for services provided to IDT
of $297,000, $453,000, $323,000, and $680,000, respectively.

   At July 31, 1997 and 1998 and April 30, 1999, the due to IDT balance
represents the net amounts owed to IDT as a result of the aforementioned
agreements and financing. No interest was charged on the Company's advances
from IDT. The average balance owed to IDT during the period from January 2,
1996 (date of inception) to July 31, 1996, the years ended July 31, 1997 and
1998, and the nine months ended April 30, 1999 and 1998 were $341,000,
$1,821,000, $7,388,000, $16,907,000 and $5,280,000, respectively.


                                      F-10
<PAGE>

                                Net2Phone, Inc.

                  NOTES TO FINANCIAL STATEMENTS--(Continued)

                 July 31, 1998 (unaudited with respect to the
                nine months ended April 30, 1998 and 1999)


5. Income Taxes

   The Company files a consolidated Federal income tax return with IDT and has
entered into a tax sharing agreement with IDT. Pursuant to such tax sharing
agreement, the Company would, while included in the IDT consolidated tax
return, be reimbursed for the use of its tax losses to the extent IDT realizes
a tax reduction from the use of such tax losses. When IDT's ownership interest
in the Company falls below 80%, the Company will no longer be a part of the
IDT consolidated Federal tax group.

   Significant components of the Company's deferred tax assets and liabilities
consists of the following:

<TABLE>
<CAPTION>
                                                       July 31        April 30
                                                  ------------------  ---------
                                                    1997     1998       1999
                                                  -------- ---------  ---------
     <S>                                          <C>      <C>        <C>
     Deferred tax assets:
       Net operating loss carryforwards.......... $    --  $ 314,000  $ 670,000
     Deferred tax liabilities:
       Depreciation..............................      --   (300,000)  (609,000)
                                                  -------- ---------  ---------
       Net deferred tax assets...................      --     14,000     61,000
       Valuation allowance.......................      --    (14,000)   (61,000)
                                                  -------- ---------  ---------
       Total deferred tax assets................. $    --  $     --   $     --
                                                  ======== =========  =========
</TABLE>

   The net deferred tax assets have been fully offset by a valuation allowance
due to the uncertainty of the realization of the assets.

   At April 30, 1999, the Company had net operating loss carryforwards for
state income tax purposes of approximately $7.5 million expiring in years
through 2006. These net operating loss carryforwards may be limited to future
taxable earnings of the Company.

<TABLE>
<CAPTION>
                                Period from         Year Ended           Nine Months
                              January 2, 1996         July 31          Ended April 30
                            (date of inception) --------------------  ------------------
                             to July 31, 1996     1997       1998       1998      1999
                            ------------------- --------  ----------  --------  --------
   <S>                      <C>                 <C>       <C>         <C>       <C>
   Tax at effective rate...      (173,000)      (577,000) (1,205,000) (229,000) (988,000)
   Benefit used by IDT for
    which the Company
    received no
    compensation...........       173,000        577,000   1,205,000   229,000   988,000
                                 --------       --------  ----------  --------  --------
   Tax provision...........           --             --          --        --        --
                                 ========       ========  ==========  ========  ========
</TABLE>

6. Stockholders' Deficit

   In April 1999, the Company amended and restated its Certificate of
Incorporation (the "Amendment"). As a result of the Amendment, the Company
increased its authorized shares of capital stock from 1,500 to 110,000,000, of
which 100,000,000 shares are designated as common stock and 10,000,000 shares
are designated as preferred stock.

   Subject to any voting rights which may be provided to future holders of
preferred stock, the holders of common stock have exclusive voting rights on
all matters requiring a vote of the Company and are entitled to one vote per
share of common stock held.

   In conjunction with the Amendment, the Company effectuated a 10,320 for one
stock split. The accompanying financial statements give retroactive effect to
the stock split.

                                     F-11
<PAGE>

                                Net2Phone, Inc.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)

                  July 31, 1998 (unaudited with respect to the
                nine months ended April 30, 1998 and 1999)


7. Commitments

Advertising and Promotion Agreements

   On February 8, 1998, the Company entered into an agreement with an Internet
company to develop a link between its Internet site and that of the Company and
advertise Company products on such site. The agreement is effective for fifteen
months upon the completion of the link and automatically extends for an
additional one year unless terminated by either party. Pursuant to such
agreement, the Company has made payments of $2.85 million through April 30,
1999 for the design, development, installation and implementation of the link
as well as the placement of Company advertisements on the Internet company's
site, of which $750,000 attributable to the development of such link has been
capitalized as computer software and $2.1 million attributable to advertising
has been expensed. As of April 30, 1999, the Company is required to make an
additional payment of $150,000 in fiscal 1999 and pay certain future
commissions, as defined, based upon revenue earned and usage of the link.

   On August 4, 1998, the Company entered into an agreement with an Internet
company to advertise Company products on its Internet site. The agreement is
effective as of October 1, 1998, the launch date of the link, and extends
indefinitely until the Internet company fully provides all advertising
impressions guaranteed under the agreement. Pursuant to such agreement, the
Company has made payments of $495,000 through April 30, 1999 for the Company
advertisements on such site. As of April 30, 1999, the Company is required to
make additional payments of $213,000 in fiscal 1999, $975,000 in fiscal 2000,
and $167,000 in fiscal 2001 and pay certain future commissions, as defined,
based upon revenue earned and usage of the link.

   Total advertising payments under the aforementioned agreements are amortized
systematically over the terms of the agreements.

   On February 19, 1999, the Company entered into an agreement with an
international computer company to build custom circuits to provide worldwide
connectivity for Company users. The agreement is effective for 63 months upon
completion of the circuits. Pursuant to such agreement, the Company has made
payments of $1 million through April 30, 1999 for its worldwide build-out,
which have been reflected on the consolidated balance sheets as prepaid
contract deposits. As of April 30, 1999, the Company is required to make an
additional payment of $1 million when the circuits are complete and pay future
fees for additional sites, usage, and installation, as defined.

License Fees and Trademark

   On January 31, 1999, the Company entered into a series of agreements with a
third party to effectuate the licensing of Internet software from the third
party, the use of the third party's trademark for $5.0 million and the bundling
of the Company's Internet telephony products with those of the third party for
a period of two years. Pursuant to such agreements, the Company has agreed to
buy $8.0 million of software and other products through January 31, 2000 and
pay commissions to such third party for each new customer it obtains through
the bundling of products. Through April 30, 1999, the Company has made payments
of $8.0 million to such third party. The software is being amortized over the
term of the agreement.

Distribution Agreements

   The Company has distribution agreements under which it has agreed to pay its
agents commissions for obtaining new Internet telephony customers. The
agreements require commissions upon activation of the customers.

                                      F-12
<PAGE>

                                Net2Phone, Inc.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)

                  July 31, 1998 (unaudited with respect to the

                nine months ended April 30, 1998 and 1999)


Employment Agreement

   In May 1997, the Company entered into a three year employment agreement with
one of its officers. Under the terms of such agreement, which was amended in
May 1999, the Company agreed to, among other things, provide such officer with
an annual salary of $100,000 and the right to purchase a 10% interest in the
Company for $100,000, which was the fair market value of the Company at that
time. Such right, which includes an anti-dilutive provision mandating that the
officer's ownership interest cannot be diluted below 8% of the total
outstanding shares upon consummation of an initial public offering of the
Company's common stock, was exercised during fiscal 1998. The agreement is
automatically renewable on an annual basis after its initial three year term
unless terminated by either party.

8. Customer and Geographical Area

   Revenue from customers outside the United States represented approximately
44%, 72%, 63%, and 58% of total revenue during the years ended July 31, 1997
and 1998 and the nine months ended April 30, 1998 and 1999, respectively.
During the year ended July 31, 1998 and the nine months ended April 30, 1998,
revenues derived from equipment sales to a customer in Korea represented
approximately 14% and 19%, respectively, of total revenue. No single geographic
area accounted for more than 10% of total revenue during the year ended July
31, 1997 and the nine months ended April 30, 1999. No customer accounted for
more than 10% of revenue during the year ended July 31, 1997 and the nine
months ended April 30, 1999.

9. Subsequent Events

   In March 1999, the Company entered into two lease agreements with companies
which are owned by the Chairman, Chief Executive Officer and Treasurer of IDT.
Pursuant to such lease agreements, the Company is required to make equal
monthly rental payments aggregating $558,000 to such companies through February
2002.

   On May 12, 1999, the Company converted a portion of its liability to IDT
into a $14,000,000 promissory note. Such promissory note accrues interest at a
rate of 9% per annum and is payable in 60 equal monthly installments of
principal and interest. Notwithstanding the foregoing, $7,000,000 in principal
will be repaid within 10 days of the consummation of a proposed initial public
offering of the Company's common stock.


   On May 13, 1999, the Company designated 3,150,000 shares of its preferred
stock as Series A ("Series A Stock") and sold 3,140,000 of such shares to
unrelated third parties in a private placement transaction for aggregate gross
proceeds of $31,400,000.

   The Series A Stock entitles its holders to a non-cumulative dividend of 8%
per annum on the original issue price. The Series A Stock is convertible into
three shares of Class A stock on a one to one basis at the option of the
holder, subject to certain adjustments as, defined. Each shares of Series A
stock also entitles its holders to vote on corporate matters on an as if
converted basis. Holders of Series A Stock have priority over common stock and
Class A stock with respect to the payment of dividends and in the event of the
liquidation or dissolution of the Company.

   The liquidation preference of the Series A Stock is equivalent to the
original issue price plus an amount equal to 8% of the original issue price
compounded on an annual basis from the date of issuance plus any declared, but
unpaid dividends.

                                      F-13
<PAGE>

                                Net2Phone, Inc.

                   NOTES TO FINANCIAL STATEMENTS--(Concluded)

                  July 31, 1998 (unaudited with respect to the

                nine months ended April 30, 1998 and 1999)

9. Subsequent Events (continued)

   In connection with the sale of Series A Stock, the Company granted warrants
to purchase 272,400 shares of common stock at an exercise price of $3.33 per
share, subject to certain adjustments as defined, from the date of issuance
through May 13, 2004 to the Series A Stock investors and placement agent. The
warrants contain a provision whereby they are automatically terminated upon a
merger or sale of the Company or an initial public offering of the Company's
stock. As a result, the warrants are expected to be exercised prior to the
proposed initial public offering of the Company's common stock.

   On June 25, 1999, the Company designated 15,000,000 shares of its capital
stock as Class A stock and the Company effectuated a three-for-one stock split.
The accompanying financial statements give retroactive effect to the stock
split. The holders of Class A stock are identical to those of common stock
except for voting and conversion rights and restrictions or transferability.
The Class A stock is entitled to two votes per share.

   In April 1999, the Company adopted a stock option and incentive plan (the
"Plan"). Pursuant to the Plan, the Company's officers, employees and non-
employee directors, as well as those of IDT, are eligible to receive awards of
incentive and non-qualified stock options, stock appreciation rights, limited
stock appreciation rights and restricted stock.

   In May 1999, a total of 5,040,000 shares of common stock were authorized for
issuance under the plan to employees of the Company and to employees and
consultants of IDT, all of which were granted with an exercise price of $3.33
per share and 1,345,219 of which were exercised through June 25, 1999. The
options generally vest over four years and expire ten years from the date of
grant. In connection with the exercise of such options, the Company extended
$3,150,000 in loans to employees. In connection with such loans, 23,382
outstanding options were canceled. On June 25, 1999 the shares authorized for
issuance under the plan was increased by 6,000,000 shares.

                                      F-14
<PAGE>

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                             4,800,000 Shares

                                   [LOGO]

                                 Common Stock

                               ----------------

                                  PROSPECTUS

                               ----------------

                               HAMBRECHT & QUIST

                              BT ALEX. BROWN

                               ----------------

                           BEAR, STEARNS & CO. INC.


                               ----------------

                                    , 1999

                               ----------------

   You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information different from that
contained in this prospectus. We are offering to sell, and seeking offers to
buy, shares of common stock only in jurisdictions where offers and sales are
permitted. The information contained in this prospectus is accurate only as of
the date of this prospectus, regardless of the time of delivery of this
prospectus or of any sale of our common stock.

   No action is being taken in any jurisdiction outside the United States to
permit a public offering of the common stock or possession or distribution of
this prospectus in that jurisdiction. Persons who come into possession of this
prospectus in jurisdictions outside the United States are required to inform
themselves about and to observe any restrictions as to this offering and the
distribution of this prospectus applicable to that jurisdiction.

   Until      , 1999, all dealers that buy, sell or trade in our common stock,
whether or not participating in this offering, may be required to deliver a
prospectus. This is in addition to the dealers' obligation to deliver a
prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

                                    PART II

                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

   Other expenses in connection with the issuance and distribution of the
securities to be registered hereunder, all of which will be paid by us, will be
substantially as follows (all amounts are estimated except the Securities and
Exchange Commission registration fee, the National Association of Securities
Dealers filing fee and the Nasdaq National Market listing fee):

<TABLE>
<CAPTION>
      Item                                                             Amount
      ----                                                           ----------
      <S>                                                            <C>
      Securities and Exchange Commission registration fee........... $   18,415
      NASD filing fee...............................................      7,124
      Nasdaq National Market listing fee............................      5,000
      Blue Sky filing fees and expenses.............................     20,000
      Accounting fees and expenses..................................    300,000
      Legal fees and expenses.......................................    500,000
      Transfer agent fees and expenses..............................      3,500
      Printing and engraving expenses...............................    400,000
      Miscellaneous expenses........................................    245,961
                                                                     ----------
        Total....................................................... $1,500,000
                                                                     ==========
</TABLE>

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS

   Reference is made to Section 145 of the Delaware General Corporation Law,
which provides for indemnification of directors, officers and other employees
in certain circumstances, and to Section 102(b)(7)of the Delaware General
Corporation Law, which provides for the elimination or limitation of the
personal liability for monetary damages of directors under certain
circumstances. Article Sixth of our certificate of incorporation, as amended
and restated, eliminates the personal liability for monetary damages of
directors under certain circumstances. Our bylaws provide indemnification to
our directors and officers to the fullest extent permitted by the Delaware
General Corporation Law for, among other things, liabilities for judgments in
and settlements of lawsuits and other proceedings and for the advance and
payment of fees and expenses reasonably incurred by the director or officer in
defense of any such lawsuit or proceeding.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES

   In October 1997, in connection with our initial organization, IDT
Corporation purchased 27,864,000 shares of our common stock for nominal
consideration.

   In January 1998, pursuant to the terms of his employment agreement with IDT
Corporation, Mr. Clifford M. Sobel purchased 3,096,000 shares of our common
stock for the purchase price of $100,000. This transaction was exempt from
registration under Section 4(2) of the Securities Act of 1933, as amended.

   In May 1999, we issued and sold an aggregate of 3,140,000 shares of Series A
convertible preferred stock at $10.00 per share, which are convertible into
9,420,000 shares of our common stock, together with warrants to purchase
180,000 shares of our class A stock to several investors for an aggregate of
$31,400,000, pursuant to Series A Subscription Agreements, dated as of May 13,
1999. This transaction was exempt from registration under Section 4(2) of the
Securities Act of 1933.

   We also issued a warrant to purchase 92,400 shares of our common stock to
the placement agent as partial consideration for its services. This transaction
was exempt from registration under Section 4(2) of the Securities Act of 1933.

   In May 1999, we issued options to purchase 5,040,000 shares pursuant to our
1999 Stock Option and Incentive Plan, and issued approximately 1,345,219 shares
of common stock upon exercise of these options. These transactions were exempt
from registration under Section 4(2) of the Securities Act of 1933.

                                      II-1
<PAGE>

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

Exhibits:

<TABLE>
<CAPTION>
 Exhibit
 Number                          Description of Exhibit
 -------                         ----------------------
 <C>     <S>
  1.1*   Form of Underwriting Agreement.
  3.1+   Certificate of Incorporation, as amended.
  3.2+   Bylaws.
  3.3    Certificate of Amendment to the Restated Certificate of Incorporation
         of the Registrant.
  4.1*   Specimen Common Stock Certificate of the Registrant.
  5.1*   Form of Opinion of Morrison & Foerster LLP.
 10.1+   Employment Agreement, dated May 1, 1997, by and between Clifford M.
         Sobel and IDT Corporation.
 10.2+   Amendment to Employment Agreement between IDT Corporation and Clifford
         M. Sobel, dated as of May 11, 1999, by and between Clifford M. Sobel,
         IDT Corporation and the Registrant.
 10.3#+  Bundling and Distribution Services Agreement, dated as of January 31,
         1999, by and between Netscape Communications Corporation and the
         Registrant.
 10.4+   General License Terms & Conditions, dated as of January 31, 1999, by
         and between Netscape Communications Corporation and the Registrant.
 10.5#+  Trademark License Agreement, dated as of January 31, 1999, by and
         between Netscape Communications Corporation and the Registrant
         Assignment .
 10.6    Internet/Telecommunications Agreement, dated as of May 7, 1999, by and
         between IDT Corporation and the Registrant.
 10.7+   Joint Marketing Agreement, dated as of May 7, 1999, by and between IDT
         Corporation and the Registrant.
 10.8    IDT Services Agreement, dated as of May 7, 1999, by and between IDT
         Corporation and the Registrant.
 10.9    Net2Phone Services Agreement, dated as of May 7, 1999, by and between
         IDT Corporation and the Registrant.
 10.10+  Assignment Agreement, dated as of May 7, 1999, by and between IDT
         Corporation and the Registrant.
 10.11+  Tax Sharing and Indemnification Agreement, dated as of May 7, 1999, by
         and between IDT Corporation and the Registrant.
 10.12   Separation Agreement, dated as of May 7, 1999, by and between IDT
         Corporation and the Registrant.
 10.13+  Lease Agreement, dated as of March 1, 1999, by and between 171-173
         Main Street Corporation and the Registrant.
 10.14+  Lease Agreement, dated as of March 1, 1999, by and between 294-298
         State Street Corporation and the Registrant.
 10.15   The Registrant's Amended and Restated 1999 Stock Option and Incentive
         Plan.
 10.16+  Series A Subscription Agreement, dated as of May 13, 1999, by and
         between the Investors listed therein and the Registrant.
 10.17+  Series A Preferred Shareholder Registration Rights Agreement, dated as
         of May 13, 1999, by and between the Investors listed therein and the
         Registrant.
 10.18+  Form of Warrant to Purchase Common Stock.
 10.19+  Promissory Note of Registrant to IDT Corporation, dated as of May 12,
         1999.
 10.20   Stockholders Agreement, dated as of May 13, 1999, by and among the
         Investors listed therein, IDT Corporation, Clifford M. Sobel, the
         trustee of the Scott Sobel Annual Gift Trust and the Registrant.
 10.21   Letter agreement, dated as of May 12, 1999, by and among IDT
         Corporation, Clifford M. Sobel and the Registrant.
 10.22   Letter agreement, dated as of May 17, 1999, by and among IDT
         Corporation, Clifford M. Sobel and the Registrant.
</TABLE>

                                      II-2
<PAGE>

<TABLE>
<CAPTION>
 Exhibit
 Number                          Description of Exhibit
 -------                         ----------------------
 <C>     <S>
 10.23   Co-Location and Facilities Management Services Agreement, dated as of
         May 20, 1999, by and between IDT Corporation and the Registrant.
 10.24   Form of Loan Agreement between the Registrant and each of its
         executive officers.
 10.25   Form of Stock Option Agreement for Executive Officers.
 10.26#  Letter agreement, dated as of June 25, 1999, by and between National
         Broadcasting Company, Inc. and the Registrant.
 23.1    Consent of Ernst & Young LLP.
 23.2*   Consent of Morrison & Foerster LLP (incorporated by reference into
         Exhibit 5.1).
 24.1    Power of Attorney (set forth on the signature page to this
         registration statement).
 27.1    Financial Data Schedule.
 99.1    Consent of Director Nominee, Raphael S. Grunfeld.
 99.2    Consent of Director Nominee, Stephen A. Oxman.
</TABLE>
- --------

*To be filed by amendment.
# Confidential treatment has been requested with respect to certain portions of
  the Exhibit. Omitted portions will be filed separately with the Securities
  and Exchange Commission.

+ Previously filed.

Financial Statements and Schedule:

 Financial Statements:

   Financial Statements filed as a part of this registration statement are
listed in the Index to Financial Statements of page F-1.

 Financial Statement Schedules:

   None.

ITEM 17. UNDERTAKINGS

   The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing of the offering specified in the Underwriting Purchase
Agreement, certificates in such denominations and registered in such names as
required by the underwriters to permit prompt delivery to each purchaser.

   Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities
Act of 1933 and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act of 1933 and will be governed by the final adjudication of such
issue.

   The undersigned registrant hereby undertakes that:

     (1) For purposes of determining any liability under the Securities Act
  of 1933, the information omitted from the form of prospectus filed as part
  of this registration statement in reliance upon Rule 430A and contained in
  a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
  (4) or

                                      II-3
<PAGE>

  497(h) under the Securities Act of 1933 shall be deemed to be part of this
  registration statement as of the time it was declared effective.

     (2) For the purpose of determining any liability under the Securities
  Act of 1933, each post-effective amendment that contains a form of
  prospectus shall be deemed to be a new registration statement relating to
  the securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.


                                     II- 4
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant has duly caused this Amendment to the registration statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the City
of Hackensack, State of New Jersey, on June 28, 1999.

                                          Net2Phone, Inc.

                                            /s/ Howard S. Balter
                                          By: _________________________________
                                                     Howard S. Balter
                                                  Chief Executive Officer

                             POWER OF ATTORNEY

   KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints and hereby authorizes Howard S. Balter and Ilan
M. Slasky, severally, such person's true and lawful attorneys-in-fact, with
full power of substitution or resubstitution, for such person and in such
person's name, place and stead, in any and all capacities, to sign on such
person's behalf, individually and in each capacity stated below, any and all
amendments, including post-effective amendments to this registration statement
and to sign any and all additional registration statements relating to the same
offering of securities as this registration statement that are filed pursuant
to Rule 462(b) of the Securities Act of 1933, and to file the same, with all
exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys-in-fact, full
power and authority to do and perform each and every act and thing requisite or
necessary to be done in and about the premises, as fully to all intents and
purposes as such person might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact, or their substitute or substitutes,
may lawfully do or cause to be done by virtue hereof.

   Pursuant to the requirements of the Securities Act of 1933, this Amendment
to the registration statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
            Name and Signatures                      Title                     Date
            -------------------                      -----                     ----

<S>                                         <C>                      <C>
           /s/ Clifford M. Sobel            President and Chairman        June 28, 1999
___________________________________________  of the Board
            Clifford M. Sobel*

           /s/ Howard S. Balter             Chief Executive Officer       June 28, 1999
___________________________________________  and Director (Principal
             Howard S. Balter                Executive Officer)

            /s/ Ilan M. Slasky              Chief Financial Officer       June 28, 1999
___________________________________________  (Chief Accounting
              Ilan M. Slasky*                Officer)

            /s/ James R. Mellor             Director                      June 28, 1999
___________________________________________
              James R. Mellor

</TABLE>

   *Executed by attorney-in-fact: Howard S. Balter

                                      II-5
<PAGE>

<TABLE>
<CAPTION>
            Name and Signatures                   Title                                     Date
            -------------------                   -----                                     ----
 <S>                                         <C>                      <C>
</TABLE>

<TABLE>
<S>                                         <C>                      <C>
            /s/ Howard S. Jonas             Director                      June 28, 1999
___________________________________________
             Howard S. Jonas*

                                            Director                      June 28, 1999
___________________________________________
               Gary Reischel

           /s/ James A. Courter             Director                      June 28, 1999
___________________________________________
             James A. Courter*
</TABLE>

   *Executed by attorney-in-fact: Howard S. Balter

                                      II-6
<PAGE>

                               INDEX OF EXHIBITS

<TABLE>
<CAPTION>
                                                                   Sequentially
 Exhibit                                                             Numbered
 Number                   Description of Exhibit                       Page
 -------                  ----------------------                   ------------
 <C>     <S>                                                       <C>
  1.1*   Form of Underwriting Agreement.
  3.1+   Certificate of incorporation, as amended.
  3.2+   Bylaws.
  3.3    Certificate of Amendment to the Restated Certificate of
         Incorporation.
  4.1*   Specimen Common Stock Certificate of the Registrant.
  5.1*   Form of Opinion of Morrison & Foerster LLP.
 10.1+   Employment Agreement, dated May 1, 1997, by and between
         Clifford M. Sobel and IDT Corporation.
 10.2+   Amendment to Employment Agreement between IDT
         Corporation and Clifford M. Sobel, dated as of May 11,
         1999, by and between Clifford M. Sobel, IDT Corporation
         and the Registrant.
 10.3#+  Bundling and Distribution Services Agreement, dated as
         of January 31, 1999, by and between Netscape
         Communications Corporation and the Registrant.
 10.4+   General License Terms & Conditions, dated as of January
         31, 1999, by and between Netscape Communications
         Corporation and the Registrant.
 10.5#+  Trademark License Agreement, dated as of January 31,
         1999, by and between Netscape Communications
         Corporation and the Registrant.
 10.6    Internet/Telecommunications Agreement, dated as of May
         7, 1999, by and between IDT Corporation and the
         Registrant.
 10.7+   Joint Marketing Agreement, dated as of May 7, 1999, by
         and between IDT Corporation and the Registrant.
 10.8    IDT Services Agreement, dated as of May 7, 1999, by and
         between IDT Corporation and the Registrant.
 10.9    Net2Phone Services Agreement, dated as of May 7, 1999,
         by and between IDT Corporation and the Registrant.
 10.10+  Assignment Agreement, dated as of May 7, 1999, by and
         between IDT Corporation and the Registrant.
 10.11+  Tax Sharing and Indemnification Agreement, dated as of
         May 7, 1999, by and between IDT Corporation and the
         Registrant.
 10.12   Separation Agreement, dated as of May 7, 1999, by and
         between IDT Corporation and the Registrant.
 10.13+  Lease Agreement, dated as of March 1, 1999, by and
         between 171-173 Main Street Corporation and the
         Registrant.
 10.14+  Lease Agreement, dated as of March 1, 1999, by and
         between 294-298 State Street Corporation and the
         Registrant.
 10.15   The Registrant's Amended and Restated 1999 Stock Option
         and Incentive Plan.
 10.16+  Series A Subscription Agreement, dated as of May 13,
         1999, by and between the Investors listed therein and
         the Registrant.
 10.17+  Series A Preferred Shareholder Registration Rights
         Agreement, dated as of May 13, 1999, by and between the
         Investors listed therein and the Registrant.
 10.18+  Form of Warrant to Purchase Common Stock.
 10.19+  Promissory Note of Registrant to IDT Corporation, dated
         as of May 12, 1999.
 10.20   Stockholders Agreement, dated as of May 13, 1999, by
         and among the Investors listed therein, IDT
         Corporation, Clifford M. Sobel, the trustee of the
         Scott Sobel Annual Gift Trust and the Registrant.
 10.21   Letter agreement, dated as of May 12, 1999, by and
         among IDT Corporation, Clifford M. Sobel and the
         Registrant.
 10.22   Letter agreement, dated as of May 17, 1999, by and
         among IDT Corporation, Clifford M. Sobel and the
         Registrant.
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                                                   Sequentially
 Exhibit                                                             Numbered
 Number                   Description of Exhibit                       Page
 -------                  ----------------------                   ------------
 <C>     <S>                                                       <C>
 10.23   Co-Location and Facilities Management Services
         Agreement, dated as of May 20, 1999, by and between IDT
         Corporation and the Registrant.
 10.24   Form of Loan Agreement between the Registrant and each
         of its executive officers.
 10.25   Form of Stock Option Agreement for Executive Officers.
 10.26#  Letter agreement, dated as of June 25, 1999, by and
         between National Broadcasting Company, Inc. and the
         Registrant.
 23.1    Consent of Ernst & Young LLP.
 23.2*   Consent of Morrison & Foerster LLP (incorporated by
         reference into Exhibit 5.1).
 24.1    Power of Attorney (set forth on the signature page to
         this registration statement).
 27.1    Financial Data Schedule.
 99.1    Consent of Director Nominee, Raphael S. Grunfeld.
 99.2    Consent of Director Nominee, Stephen A. Oxman.
</TABLE>
- --------

*To be filed by amendment.

# Confidential treatment has been requested with respect to certain portions of
  the Exhibit. Omitted portions will be filed separately with the Securities
  and Exchange Commission.

+ Previously filed.

                                       2

<PAGE>
                                                                     EXHIBIT 3.3


                           CERTIFICATE OF AMENDMENT

                                     TO THE

                     RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                                NET2PHONE, INC.

                    (pursuant to Section 242 of the DGCL)

        NET2PHONE, INC., a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, DOES HEREBY
CERTIFY:

        1. The name of the corporation is Net2Phone, Inc. (hereinafter the
"Corporation").

        2. The Corporation's Certificate of Incorporation was initially filed
with the Secretary of State of the State of Delaware on October 10, 1997 and was
amended and restated on May 14, 1999.

        3. The Certificate of Incorporation of the Corporation is hereby amended
by deleting the Preamble of Article Fourth thereof and replacing it with the
following:

        ARTICLE FOURTH: the aggregate number of shares of all classes of capital
stock which the Corporation shall have the authority to issue is two hundred and
forty-seven million, forty-two thousand and eighty-nine (247,042,089) shares,
consisting of (a) 200,000,000 shares of common stock, par value $.01 per share
("Common Stock"), (b) 37,042,089 shares of Class A common stock, par value $.01
per share (the "Class A Stock" and, together with the Common Stock, the "Common
Shares"), and (c) 10,000,000 shares of preferred stock, par value $.01 per share
("Preferred Stock"). Effective upon filing of this Certificate of Amendment,
each share of the Corporation's Common Stock and each share of the Corporation's
Class A Stock that is outstanding on the date of filing shall be subdivided into
three (3) shares of Common Stock or Class A Stock, as applicable, and the par
value of each post-split share of Common Stock and Class A Stock shall be
restated to equal $.01 per share.

        [Signature Page follows]
<PAGE>

        IN WITNESS WHEREOF, the Corporation has caused this Certificate of
Amendment to be executed on its behalf this 24th day of June, 1999.


                                               NET2PHONE, INC.



                                               By: /s/ Howard Balter
                                                  ____________________________
                                                  Name: Howard Balter
                                                  Title: Chief Executive Officer



Attest:

        By: /s/ Joel Haims
            _______________
        Name: Joel Haims



<PAGE>

                                                                    EXHIBIT 10.6

                     INTERNET/TELECOMMUNICATIONS AGREEMENT

     INTERNET/TELECOMMUNICATIONS AGREEMENT, dated May 7, 1999 (this
"Agreement"), by and between IDT Corporation, a Delaware corporation ("IDT"),
and Net2Phone, Inc., a Delaware corporation ("Net2Phone").

     WHEREAS, Net2Phone is currently a subsidiary of IDT;

     WHEREAS, IDT currently maintains a telecommunication switching
infrastructure and network which provides Internet access and Internet telephony
services for the customers of IDT and Net2Phone;

     WHEREAS, parties intend that Net2Phone be given an indefeasible right to
use parts of IDT's Internet network.

     NOW, THEREFORE, in consideration of the premises and mutual promises and
representations contained herein, and other good and valuable consideration, the
sufficiency of which is hereby acknowledged, the parties hereto do mutually
covenant, stipulate and agree as follows:

     1.   Internet Network.

          (a)  Existing Network.  IDT hereby grants and conveys to Net2Phone an
               ----------------
indefeasible right to use and enjoy, to the extent of IDT's rights therein,
those equipment items, equipment leases and rights of use and/or access which
are part of IDT's existing DS3 network and are described on Exhibit A hereto
                                                            ---------
(the "Existing Network"), such grant and conveyance to be effective as of the
date hereof. The foregoing grant and conveyance shall terminate with respect to
any item described on Exhibit A hereto upon the first of the following to occur:
                      ---------
(i) with respect to any part of the Existing Network, upon the expiration of the
respective lease or other agreement set forth in Exhibit A relating to such part
                                                 ---------
of the Existing Network; (ii) with respect to any part of the Existing Network
which will be replaced by the Frontier Network (as defined below), upon
Net2Phone exercising its rights set forth in Section 2(a) hereof with respect to
such part of the Existing Network; or (iii) with respect to any part of the
Existing Network not sooner terminated pursuant to clauses (i) or (ii) above,
upon the mutual consent of IDT and Net2Phone.

               Net2Phone hereby agrees it shall perform all obligations
reasonably required of it by IDT and shall do nothing whatsoever in violation of
the agreements set forth on Exhibit A. It is expressly understood that IDT
                            ---------
remains the primary party with respect to all agreements set forth on Exhibit A
                                                                      ---------
and retains all obligations to pay rent and/or usage fees in connection
therewith.

          (b)  Frontier Network.  Pursuant to a Telecommunications Services
               ----------------
Agreement, dated September 24, 1998 (the "Frontier Agreement"), by and between
IDT and Frontier Communications of the West, Inc. ("Frontier"), IDT has an
indefeasible right to use a certain telecommunication network as it is completed
and delivered pursuant to the terms and conditions set forth in the Frontier
Agreement. IDT hereby grants and conveys to Net2Phone an
<PAGE>

indefeasible right to use and enjoy, to the extent of IDT's rights therein,
those parts of such telecommunication network which are described on Exhibit B
                                                                     ---------
hereto (the "Frontier Network"), such grant and conveyance to be effective, with
respect to those parts of the Frontier Network which have already been completed
and delivered, on the date hereof and, with respect to any part of the Frontier
Network which has not yet been completed and delivered, on the date such part of
the Frontier Network is completed and delivered. The foregoing grant and
conveyance with respect to the Frontier Network shall terminate upon the
expiration of the Frontier Agreement, in accordance with its terms; provided,
                                                                    --------
however, Net2Phone shall have the right to request an earlier termination of
- -------
such grant and conveyance, in whole or in part, which request shall be granted
by IDT solely in the event that Frontier agrees to amend the Frontier Agreement
to permit a termination of IDT's corresponding obligations under the Frontier
Agreement and that Net2Phone pays all costs and expenses incurred to secure
Frontier's consent to such amendment.

          Net2Phone hereby agrees it shall perform all obligations reasonably
required of it by IDT and shall do nothing whatsoever in violation of the
Frontier Agreement.  It is expressly understood that IDT remains the primary
party with respect to the Frontier Agreement and retains all obligations to pay
maintenance and/or usage fees in connection therewith.

          (c)  Networking Infrastructure.  IDT hereby grants and conveys to
               -------------------------
Net2Phone the right to use and enjoy, to the extent of IDT's rights therein, the
equipment, equipment leases, co-location agreements and rights of use and/or
access primarily located at the backbone points of presence on its Internet
network and comprising its networking infrastructure, as more particularly
described on Exhibit C hereto (the "Networking Infrastructure Equipment"), for a
             ---------
period of two years commencing on the date hereof.

          Net2Phone hereby agrees that it shall perform all obligations
reasonably required of it by IDT and shall do nothing whatsoever in violation of
the leases and other agreements set forth on Exhibit C.  It is expressly
                                             ---------
understood that IDT remains the primary party with respect to all agreements set
forth on Exhibit C and retains all obligations to pay rent and/or usage fees in
         ---------
connection therewith.

          (d)  Transit Relationship Agreements.  IDT hereby agrees to enter into
               -------------------------------
transit relationship agreements with Net2Phone to provide Net2Phone with rights
of access substantially identical with those of IDT at the locations set forth
on Exhibit D hereto, for a period of one year commencing on the date hereof. In
   ---------
accordance with current industry custom, such transit relationships shall be
provided on a mutual and gratuitous basis. At the end of such initial term and
of each year thereafter, such rights of access shall automatically renew for an
additional one (1) year period unless one party has given the other party sixty
(60) days' prior written notice terminating such rights of access. Following
such initial term, such rights of access may be terminated at any time at the
option of either IDT or Net2Phone upon sixty (60) days' prior written notice.

          (e)  Network Operations Center.  IDT hereby grants and conveys to
               -------------------------
Net2Phone the right to use and enjoy, to the extent of IDT's rights therein, the
equipment, equipment leases and rights of use and/or access and other facilities
comprising its Network

                                       2
<PAGE>

Operations Center, as more particularly described on Exhibit E hereto (the "NOC
                                                     ---------
Facilities"), for a period of two years commencing on date hereof.

          Net2Phone hereby agrees that upon such grant and conveyance it shall
perform all obligations reasonably required of it by IDT and shall do nothing
whatsoever in violation of the leases and other agreements set forth on Exhibit
                                                                        -------
E.  It is expressly understood that IDT remains the primary party with respect
- -
to all agreements set forth on Exhibit E and retains all obligations to pay rent
                               ---------
and/or usage fees in connection therewith.  The IDT employees at the NOC
Facilities who are listed on Exhibit F hereto shall be transferred to, and
                             ---------
become employees of, Net2Phone on the date hereof or as promptly thereafter as
is feasible so as to permit an orderly transition.

          (f)  Maintenance and Support.  With respect to leases and other
               -----------------------
agreements described in the Exhibits hereto, IDT shall use commercially
reasonable efforts to cause the other parties to such leases and other
agreements to fulfill their respective contractual obligations, including those
(if any) relating to the maintenance of equipment or network access. With
respect to equipment listed on the exhibits hereto which is or becomes owned by
IDT or which is leased by IDT pursuant to leases which obligate IDT to maintain
such equipment, IDT shall maintain such equipment in accordance with industry
practice and, upon notice from Net2Phone of any malfunctioning of such
equipment, shall promptly repair or cause the repair of such equipment.
Net2Phone shall reimburse IDT for all costs and expenses incurred by IDT for the
maintenance and repair of such equipment to the extent that IDT is contractually
obligated for such maintenance and repair. Net2Phone shall also reimburse IDT
for all necessary upgrades to such equipment and, to the extent permitted by the
respective leases (if any), Net2Phone shall own any upgrades so installed.

          (g)  Equipment with Expiring Leases.  To the extent that any equipment
               ------------------------------
described on the Exhibits hereto is subject to a lease which terminates during
the term of Net2Phone's right to use such item of equipment, following the
termination of such lease IDT shall be responsible for providing Net2Phone with
an item of equipment of equivalent function and quality for the remainder of
Net2Phone's right of use hereunder.

          (h)  No Modifications to Third Party Contracts.  With respect to the
               -----------------------------------------
Frontier Agreement and all the leases and other agreements described on the
Exhibits hereto from which IDT derives the rights necessary for Net2Phone to
exercise the rights of use granted herein, IDT shall fulfill all of its
obligations with respect to each such agreement and shall not amend, alter,
supplement, terminate, cancel, assign, transfer or otherwise modify any such
agreement without the prior written consent of Net2Phone; provided, however,
                                                          --------  -------
that IDT's obligation with respect to any such agreement shall cease upon the
expiration of the corresponding Net2Phone right of use granted herein.

          (i)  No Assignment.  This Agreement shall not be construed as an
               -------------
assignment or as an attempted assignment of any of the leases or other
agreements set forth on the Exhibits hereto. To the extent that any transaction
contemplated by the provisions of this Agreement requires the consent of a party
to the leases or other agreements set forth on the Exhibits hereto (other than
IDT), such transaction shall not be effective with respect to such lease or
other agreement until such consent has been received and IDT hereby agrees to
use all commercially reasonable efforts to procure such consent.

                                       3
<PAGE>

          (j)  Hosting Service.  It is understood that IDT retains primary
               ---------------
control over the Internet equipment listed on the Exhibits hereto.
Notwithstanding the foregoing, to the extent that IDT requires Net2Phone's
assistance in gaining Internet access as a result of Net2Phone exercising the
rights to use the equipment and/or access granted to Net2Phone herein, Net2Phone
hereby agrees to facilitate such access for a period of five years commencing on
the date hereof. At the end of such initial term and of each year thereafter,
Net2Phone's obligation to facilitate IDT's Internet access shall automatically
renew for an additional one (1) year period unless one party has given the other
party sixty (60) days' prior written notice terminating such facilitation of
Internet access. Following such initial term, such facilitation of Internet
access may be terminated at any time at the option of either IDT or Net2Phone
upon sixty (60) days' prior written notice. As compensation to Net2Phone for
facilitating such access, IDT agrees to pay for such usage and services as
provided in Section 2(d) hereof.

          (k)  Transfer Pricing.  For a period of two years commencing on the
               ----------------
date hereof, Net2Phone hereby agrees (i) that IDT is hereby granted the right of
first refusal to provide Net2Phone's carrier traffic, (ii) that any carrier
traffic actually routed over IDT's direct routes (whether or not pursuant to the
foregoing right of first refusal) shall be charged at the greater of (A) IDT's
overall most favorite nation selling price less 5% and (B) IDT's cost plus 5%,
and (iii) that any other carrier traffic actually routed over IDT's
telecommunications network (whether or not pursuant to this right of first
refusal) shall be charged at IDT's cost plus 10%. For a two year period
commencing on the date hereof, each party hereby grants the other party an
option to purchase bandwidth from such granting party at the granting party's
cost plus 10% and Net2Phone hereby grants IDT an option to use Net2Phone's
indirect telecommunications network (to the extent that Net2Phone has excess
availability thereon) to route IDT's carrier traffic at Net2Phone's cost plus
10%. At the end of such initial terms and of each year thereafter, such
agreements with respect to carrier traffic and bandwidth shall automatically
renew for an additional one (1) year period unless one party has given the other
party sixty (60) days' prior written notice terminating such respective
agreements. Following such initial term, such agreements with respect to carrier
traffic or bandwidth may be terminated at any time at the option of either IDT
or Net2Phone upon sixty (60) days' prior written notice.

          (l)  Network Unavailability.  Each of the parties acknowledges that
               ----------------------
the Internet network or any of the networks or equipment referred to herein may
be unavailable periodically for the purposes of maintenance and/or upgrades.
Each of the parties further acknowledges that periodic service outages, known as
"brownouts," may occur in connection with the network. Each of the parties shall
use all reasonable efforts to minimize any such interruptions and brownouts with
respect to equipment or other aspects of the network and network infrastructure
which it controls. Each party agrees to hold the other party harmless of any and
all losses arising to such party and/or any third parties as a result of
"brownouts," service interruptions and server unavailability.

          Notwithstanding the foregoing, in the event that either Net2Phone or
IDT suffers a "brownout" from the equipment or rights of access referenced in
this Section 1 for any reason, IDT or Net2Phone, as the case may be, shall use
reasonable commercial efforts to obtain a rebate or other concession from any
third party which may have responsibility for such unavailability. In case
either party receives any such rebate or concession, such party shall share any
such rebate

                                       4
<PAGE>

or concession with the other in a manner reflecting the relative loss of usage
incurred by each of Net2Phone and IDT.

          (m)  With respect to any equipment or rights of use and/or access to
which IDT has granted Net2Phone a right of use herein, Net2Phone shall have the
right to use such equipment and access to the exclusion of IDT for the duration
of the right granted herein.

     2.   Payments.
          --------

          (a)  Existing Network.  On May 1, 1999, and on the first day of each
               ----------------
month thereafter until such time as the grant and conveyance set forth in
Section 1(a) hereof has terminated in its entirety, Net2Phone shall pay to IDT
an Existing Network Fee (as defined below) as compensation for the grant and
conveyance set forth in Section 1(a) hereof with respect to the Existing
Network.

          As the Frontier Network is completed and delivered, Net2Phone shall
have the right to require IDT to terminate, in whole or in part, any or all of
the leases and other agreements set forth in Exhibit A, to the extent permitted
                                             ---------
by such instruments.  With respect to any termination requested by Net2Phone,
the actual date such lease or other agreement is terminated shall hereinafter be
referred to as the "Termination Date" with respect to such lease or other
agreement.  To the extent that IDT incurs any termination or cancellation
charges as a result of any such lease or contract termination, Net2Phone shall
reimburse IDT for such charges upon demand.

          The Existing Network Fee shall equal, on each date payable, the
product of $60,000 multiplied by a fraction, the numerator of which is the total
mileage of all circuits set forth on Exhibit A hereto except those circuits with
                                     ---------
respect to which a Termination Date has occurred and the denominator of which is
the total mileage of all circuits set forth on Exhibit A hereto.  Ten (10) days
                                               ---------
following the end of any month in which a Termination Date has occurred, IDT
shall refund to Net2Phone upon the request of Net2Phone that portion of the
Existing Network Fee for such month representing the per diem charge for each
circuit deemed terminated during such month (based on mileage) for the number of
days in such month following the Termination Date with respect to such circuit.

          (b)  Frontier Network.  Pursuant to the Frontier Agreement, IDT must
               ----------------
pay Frontier certain non-recurring charges for the installation of the Frontier
network, some of which IDT has already paid Frontier and the remainder of which
IDT will pay Frontier as the network is completed and delivered. Upon the
completion and delivery of each circuit set forth on Exhibit B, Net2Phone shall
                                                     ---------
pay to IDT an amount equal to the non-recurring charge with respect to such
circuit (as set forth on Exhibit B) plus 10%, such amount to be paid with
                         ---------
interest at 9% per annum in sixty (60) equal monthly installments commencing
thirty (30) days following the completion and delivery of such circuit. Upon the
completion and delivery of all of the circuits set forth on Exhibit B, the
                                                            ---------
amount payable by Net2Phone with respect to the non-recurring charges for the
individual circuits shall be aggregated and the payments restructured so that
such aggregate outstanding amount shall be paid, with interest at 9% per annum,
in equal monthly payments during the Restructured Term (as defined below)
commencing thirty (30) days following the completion and delivery of the final
circuit of the Frontier Network. The

                                       5
<PAGE>

"Restructured Term" shall commence thirty (30) days following the completion and
delivery of the final circuit of the Frontier Network and shall continue for
that number of months equal the weighted average, rounded to the nearest whole
number, of the number of months remaining in the original payment periods of the
individual circuits.

          In addition, Net2Phone shall pay to IDT with respect to the completion
and delivery of the Frontier Network an installation fee of $600,000 (the
"Installation Fee").  Upon the completion and delivery of each circuit set forth
on Exhibit B hereto, Net2Phone shall pay to IDT an amount equal to the product
   ---------
of the Installation Fee multiplied by a fraction, the numerator of which is the
non-recurring charge with respect to such circuit (as set forth on Exhibit B)
                                                                   ---------
and the denominator of which is the sum of all non-recurring charges (as set
forth on Exhibit B) with respect to all of the circuits of the Frontier Network
         ---------
described on Exhibit B hereto.
             ---------

          In addition, beginning on the date hereof and continuing until the
termination in its entirety of the grant and conveyance with respect to the
Frontier Network, Net2Phone shall reimburse IDT an amount equal to the costs and
fees IDT incurs subsequent to the date hereof with respect to the Frontier
Network pursuant to the Frontier Agreement (other than the non-recurring
charges), such reimbursement shall be due and payable upon payment by IDT of
such costs and fees.

          (c)  Networking Infrastructure and Network Operations Center.  For
               -------------------------------------------------------
24 months commencing on April 1, 1999, Net2Phone shall pay to IDT $50,000 per
month as compensation for the rights of usage and enjoyment with respect to the
Networking Infrastructure Equipment (as set forth in Section 1(c) hereof) and
the NOC Facilities (as set forth in Section 1(e) hereof). Upon the expiration of
Net2Phone's rights to use and enjoy the Networking Infrastructure Equipment and
NOC Facilities pursuant to Sections 1(c) and (e) hereof, IDT hereby grants to
Net2Phone the right to purchase from IDT at fair market value any such items of
equipment then owned by IDT.

          (d)  Internet Usage and Services.  During the period set forth in
               ---------------------------
Section 1(j) hereof (as extended pursuant to the terms thereof), IDT shall pay
on the first day of each month (i) for each of IDT's dial-up Internet customers,
$1.00 and (ii) for each of IDT's dedicated-line Internet customers, the lesser
of $100.00 or 20% of the fee that IDT charges such customer. Additionally, in
the case of IDT's dedicated-line customers, IDT shall pay Net2Phone 25% of all
installation fees charged such customers by IDT.

     3.   Ownership of Equipment and Intellectual Property.
          ------------------------------------------------

          Nothing herein is intended to, nor shall it, change the legal
ownership of any equipment or intellectual property.

     4.   Termination.
          -----------

          (a)  This Agreement may only be terminated by the mutual agreement of
the parties in writing, except as specifically set forth in this Agreement with
respect to specific portions hereof.

                                       6
<PAGE>

          (b)  Sections 3 and 4 shall survive termination of this Agreement.

     5.   Miscellaneous.
          -------------

          (a)  This Agreement may not be transferred or assigned by either
party, whether voluntarily or by operation of law, without the prior written
consent of the other. This Agreement shall inure to the benefit of and be
binding upon all permitted successors and assigns.

          (b)  This Agreement shall be governed by the laws of the State of New
York (regardless of the laws that might otherwise govern under applicable
principles of conflicts of law) as to all matters, including, but not limited
to, matters of validity, construction, effect, performance and remedies.

          (c)  This Agreement may be executed in counterparts, each of which
shall constitute an original and both of which together shall be deemed to be
one and the same instrument.

          (d)  All notices, requests, demands, waivers and other communications
required or permitted to be given under this Agreement shall be in writing and
shall be deemed to have been duly given if delivered personally or by facsimile
transmission or mailed (certified or registered mail, postage prepaid, return
receipt requested):

               If to IDT, to:


               IDT Corporation
               190 Main Street
               Hackensack, New Jersey  07601
               Attention:  Chief Financial Officer
               Fax No.:  (201) 907-5165

               If to Net2Phone, to:

               Net2Phone, Inc.
               171 Main Street
               Hackensack, New Jersey  07601
               Attention:  Chief Financial Officer
               Fax No.:  (201) 907-5351

or to such other person or address as any party shall specify by notice in
writing to the other party.  All such notices, requests, demands, waivers and
communications shall be deemed to have been received on the date on which hand
delivered, upon transmission of the facsimile transmission by the sender and
issuance by the transmitting machine of a confirmation slip confirming that the
number of pages constituting the notice have been transmitted without error, or
on the third business day following the date on which so mailed, except for a
notice of change of address, which shall be effective only upon receipt thereof.
In the case of a notice sent by facsimile transmission, the sender shall
contemporaneously mail a copy of the notice to the addressee at the address
provided for above.  However, such mailing shall in no way alter the

                                       7
<PAGE>

time at which the facsimile notice is deemed received. In no event shall the
provision of notice pursuant to this Section 5(d) constitute notice for service
of process.

          (e)  This Agreement and those provisions of the Separation Agreement
(defined below) specifically referred to herein contain the entire understanding
of the parties hereto with respect to the subject matter of this Agreement. This
Agreement and such referenced provisions of the Separation Agreement supersede
all prior agreements and understandings, oral or written, with respect to the
subject matter of this Agreement.

          (f)  In the event that any one or more of the provisions contained
herein is held invalid or unenforceable in any respect, the parties shall
negotiate in good faith with a view toward substituting therefor a suitable and
equitable solution in order to carry out the intent and purpose of such invalid
provision; provided, however, that the validity and enforceability of any such
           --------  -------
provision in every other respect and of the remaining provisions contained
herein shall not be in any way impaired thereby, it being intended that all of
the rights and privileges of the parties hereto shall be enforceable to the
fullest extent permitted by law.

          (g)  The Section headings contained in this Agreement are for
reference only and shall not affect the meaning or interpretation of this
Agreement.

          (h)  IN NO EVENT SHALL EITHER PARTY BE LIABLE TO THE OTHER FOR ANY
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, WITHOUT LIMITATION,
LOSS OF PROFITS, REVENUES OR DATA), WHETHER BASED ON BREACH OF CONTRACT, TORT
(INCLUDING NEGLIGENCE) OR OTHERWISE, WHETHER OR NOT THAT PARTY HAS BEEN ADVISED
OF THE POSSIBILITY OF SUCH DAMAGE. THE LIABILITY OF EITHER PARTY FOR DAMAGES OR
ALLEGED DAMAGES HEREUNDER, WHETHER IN CONTRACT, TORT OR ANY OTHER LEGAL THEORY,
IS LIMITED TO, AND WILL NOT EXCEED, THE OTHER PARTY'S DIRECT DAMAGES.

          (i)  Any dispute, controversy or claim arising out of or relating to
this Agreement or the breach, termination or validity hereof, or any transaction
contemplated hereby shall be settled in accordance with the procedures set forth
in Article VIII of the Separation Agreement, dated as of May 7, 1999, by and
between IDT and Net2Phone, as if such Article VIII were set forth herein in its
entirety.

                                       8
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorized representatives as of the date first above
written.

                                 IDT CORPORATION

                                 By: /s/ Hal Brecher
                                    -----------------------------------
                                    Name: Hal Brecher
                                    Title: Chief Operating Officer


                                 NET2PHONE, INC.

                                 By: /s/ Howard Balter
                                    -----------------------------------
                                    Name: Howard Balter
                                    Title: Chief Executive Officer

                                       9

<PAGE>

                                                                    EXHIBIT 10.8

                             IDT SERVICES AGREEMENT


     IDT SERVICES AGREEMENT, dated as of May 7, 1999 (this "Agreement"), by and
between IDT Corporation, a Delaware corporation ("IDT"), and Net2Phone, Inc., a
Delaware corporation ("Net2Phone").

     WHEREAS, Net2Phone is currently a subsidiary of IDT and obtains
administrative, customer support and other services from IDT;

     WHEREAS, Net2Phone and IDT expect that equity interests in Net2Phone may be
sold to additional investors; and

     WHEREAS, Net2Phone desires to continue to obtain administrative, customer
support and other services from IDT pursuant to the terms hereof and IDT desires
to continue to provide such services pursuant to the terms hereof.

     NOW, THEREFORE, in consideration of the premises and mutual promises and
representations contained herein, and other good and valuable consideration, the
sufficiency of which is hereby acknowledged, the parties hereto do mutually
covenant, stipulate and agree as follows:


Section 1.  Services.
            --------

       (a)  IDT shall render to Net2Phone general accounting services, payroll
and benefits administration services, customer support and other services all as
more particularly described in Exhibit 1 hereto (collectively, the "Services").
                               ---------
The Services shall be rendered by IDT in conformity with good commercial
practice, the terms and conditions of this Agreement and the reasonable
instructions of Net2Phone as set forth in this Agreement.

       (b)  Net2Phone shall provide to IDT when required all funds necessary to
perform the Services, including, without limitation, all amounts required to pay
payroll expenses of employees of Net2Phone and all amounts necessary to pay
accounts payable of Net2Phone.

       (c)  IDT shall have no authority pursuant to this Agreement to commit
Net2Phone to any obligation in any manner whatsoever with respect to third
parties, to use Net2Phone's name in any way or to enter into any contracts on
behalf of Net2Phone.

       (d)  In the event that Net2Phone requests services in addition to the
Services provided for herein, and if IDT agrees to provide such services, IDT
and Net2Phone shall negotiate in good faith a fee for such services, which
compensation shall be covered by the final sentence of Section 2(a) hereof;
provided, however, that the fee payable by
- --------  -------

                                       1
<PAGE>

Net2Phone for such services shall be no less favorable to Net2Phone than the
charges for comparable services from unaffiliated third parties. In the event
that the parties agree to additional services, the scope and duration of such
services, and any termination provisions with respect thereto, shall be
described in an addendum to Exhibit 1 and thereafter such services shall be
                            ---------
considered Services hereunder. If and to the extent the parties agree to cancel
or terminate any of the Services, such services shall be deemed deleted from
Exhibit 1, with the remaining services thereafter constituting the Services
- ---------
hereunder.


Section 2.  Compensation.
            ------------

       (a)  Net2Phone shall pay to IDT a fee for each of the Services equal to
the amount set forth in Exhibit 1 corresponding to such service.  In the event
                        ---------
Net2Phone terminates any Service in accordance with the final sentence of
Section 3 hereof, the fee for such Service shall no longer be payable for any
period subsequent to the effective date of such termination.  In the event the
parties agree to additional services, such fee shall be payable as provided
herein.

       (b)  Within 15 days following the end of each calendar month, IDT shall
submit to Net2Phone for payment a billing invoice setting forth the amount of
fees payable by Net2Phone to IDT for Services rendered during such calendar
month. Net2Phone shall pay the invoiced amount to IDT within thirty (30) days
following receipt of such invoice by Net2Phone.


Section 3.  Term.
            ----

       The term of this Agreement shall commence on the date hereof and shall
continue for a period of one (1) year (the "Initial Term") and, at the end of
the Initial Term and of each year thereafter, shall automatically renew for an
additional one (1) year period unless one party has given the other party thirty
(30) days' prior written notice terminating this Agreement.  Following the
Initial Term, this Agreement may be terminated at any time at the option of
either IDT or Net2Phone upon thirty (30) days' prior written notice.  Specific
categories of Services may be cancelled as set forth in Exhibit 1.
                                                        ---------

Section 4.  Records and Accounts.
            --------------------

       IDT shall maintain accurate records and accounts of all transactions
relating to the Services performed by it pursuant to this Agreement.  Such
records and accounts shall be maintained separately from IDT's own records and
accounts and shall reflect such information as would normally be examined by an
independent accountant in performing a complete audit pursuant to United States
generally accepted auditing standards for the purpose of certifying financial
statements, and to permit verification thereof by

                                       2
<PAGE>

governmental agencies. Net2Phone shall have the right to inspect and copy, upon
reasonable notice and at reasonable intervals during IDT's regular office hours,
the separate records and accounts maintained by IDT relating to the Services.


Section 5.  Directors and Officers of Net2Phone and IDT.
            -------------------------------------------

       (a)  Nothing contained in this Agreement shall be deemed to relieve the
officers and directors of Net2Phone from the performance of their duties or
limit the exercise of their powers in accordance with Net2Phone's Certificate of
Incorporation or the laws of the State of Delaware. The services of IDT's
officers and employees which are rendered to Net2Phone under this Agreement
shall at all times be in accordance with the reasonable instructions of
Net2Phone's officers and in accordance with IDT's historical business practice.

       (b)  Nothing in this Agreement shall limit or restrict the right of any
of IDT's directors, officers or employees to engage in any other business or
devote their time and attention in part to the management or other aspects of
any other business, whether of a similar nature, or to limit or restrict the
right of IDT to engage in any other business or to render services of any kind
to any corporation, firm, individual, trust or association; provided, however,
                                                            --------  -------
that the foregoing shall in no way modify or limit IDT's agreement not to
compete with Net2Phone as set forth in Section 6.3 of the Separation Agreement
between IDT and Net2Phone, dated the date hereof (the "Separation Agreement"),
and IDT hereby confirms its agreement to be bound by the terms thereof..


Section 6.  Liability; Indemnification.
            --------------------------

       (a)  IDT shall have no liability whatsoever to Net2Phone for any error,
act or omission in connection with the services to be rendered by IDT to
Net2Phone hereunder unless any such error, act or omission derives from willful
misconduct or gross negligence. The parties acknowledge that Article VIII of the
Separation Agreement provides for indemnification obligations relating to this
Agreement and confirm their agreement to be bound by the terms thereof.  IN NO
EVENT SHALL IDT BE LIABLE TO NET2PHONE FOR ANY SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, WITHOUT LIMITATION, LOSS OF PROFITS, REVENUES
OR DATA), WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE) OR
OTHERWISE, WHETHER OR NOT IDT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.  THE LIABILITY OF IDT FOR DAMAGES OR ALLEGED DAMAGES HEREUNDER, WHETHER
IN CONTRACT, TORT OR ANY OTHER LEGAL THEORY, IS LIMITED TO, AND WILL NOT EXCEED,
NET2PHONE'S DIRECT DAMAGES.

       (b)  IDT is an independent contractor and when its employees act under
the terms of this Agreement, they shall be deemed at all times to be under the
supervision and responsibility of IDT; and, notwithstanding any reimbursement of
labor costs as provided

                                       3
<PAGE>

herein or otherwise, no person employed by IDT and acting under the terms of
this Agreement shall be deemed to be acting as agent or employee of Net2Phone or
any customer of Net2Phone for any purpose whatsoever.


Section 7.  Other Agreements.
            ----------------

       From time to time, Net2Phone may find it necessary or desirable either to
enter into agreements covering services of the type contemplated by this
Agreement to be provided by parties other than IDT or to enter into other
agreements covering functions to be performed by IDT hereunder.  Nothing in this
Agreement shall be deemed to limit in any way the right of Net2Phone to acquire
such services from others or to enter into such other agreements; provided that
                                                                  --------
in no such event shall the compensation to be paid to IDT pursuant to Section 2
hereof be reduced on account thereof unless and until this Agreement is
terminated, or the applicable category of Services set forth in Exhibit 1, is
                                                                ---------
cancelled in accordance with Section 3 hereof and Exhibit 1 hereto.
                                                  ---------


Section 8.  Confidentiality.
            ---------------

       IDT agrees to hold in strict confidence, and to use reasonable efforts to
cause its employees and representatives to hold in strict confidence, all
confidential information concerning Net2Phone furnished to or obtained by IDT in
the course of providing the Services (except to the extent that such information
has been (a) in the public domain through no fault of IDT or (b) lawfully
acquired by IDT from sources other than Net2Phone); and IDT shall not disclose
or release any such confidential information to any person, except its
employees, representatives and agents who have a need to know such information
in connection with IDT's performance under this Agreement, unless (i) such
disclosure or release is compelled by the judicial or administrative process, or
(ii) in the opinion of counsel to IDT, such disclosure or release is necessary
pursuant to requirements of law or the requirements of any governmental entity
including, without limitation, disclosure requirements under the Securities Act
of 1933 or the Securities Exchange Act of 1934, in each case as amended.


Section 9.  Miscellaneous.
            -------------

       (a)  This Agreement may not be transferred or assigned by either party,
whether voluntarily or by operation of law, without the prior written consent of
the other which consent may be withheld in such party's sole discretion.  This
Agreement shall inure to the benefit of and be binding upon all permitted
successors and assigns.

       (b)  This Agreement shall be governed by the laws of the State of New
York (regardless of the laws that might otherwise govern under applicable
principles of conflicts of law) as to all matters, including, but not limited
to, matters of validity, construction, effect, performance and remedies.

                                       4
<PAGE>

       (c)  This Agreement may be executed in counterparts, each of which shall
constitute an original and both of which together shall be deemed to be one and
the same instrument.

       (d)  All notices, requests, demands, waivers and other communications
required or permitted to be given under this Agreement shall be in writing and
shall be deemed to have been duly given if delivered personally or by facsimile
transmission or mailed (certified or registered mail, postage prepaid, return
receipt requested):

  If to IDT, to:        IDT Corporation
                        190 Main Street
                        Hackensack, New Jersey  07601
                        Attention:  Chief Financial Officer
                        Fax No.:  (201) 907-5165

  If to Net2Phone, to:  Net2Phone, Inc.
                        171 Main Street
                        Hackensack, New Jersey  07601
                        Attention:  Chief Financial Officer
                        Fax No.:  (201) 907-5351

or to such other person or address as any party shall specify by notice in
writing to the other party.  All such notices, requests, demands, waivers and
communications shall be deemed to have been received on the date on which hand
delivered, upon transmission of the facsimile transmission by the sender and
issuance by the transmitting machine of a confirmation slip confirming that the
number of pages constituting the notice have been transmitted without error, or
on the third business day following the date on which so mailed, except for a
notice of change of address, which shall be effective only upon receipt thereof.
In the case of a notice sent by facsimile transmission, the sender shall
contemporaneously mail a copy of the notice to the addressee at the address
provided for above.  However, such mailing shall in no way alter the time at
which the facsimile notice is deemed received.  In no event shall the provision
of notice pursuant to this Section 9(d) constitute notice for service of
process.

       (e)  This Agreement and those provisions of the Separation Agreement
specifically referred to herein contain the entire understanding of the parties
hereto with respect to the subject matter of this Agreement. This Agreement and
such referenced provisions of the Separation Agreement supersede all prior
agreements and understandings, oral or written, with respect to the subject
matter of this Agreement.

       (f)  The provisions of Sections 6 and 8 hereof shall survive any
termination of this Agreement.

       (g)  In the event that any one or more of the provisions contained herein
is held invalid or unenforceable in any respect, the parties shall negotiate in
good faith with a

                                       5
<PAGE>

view toward substituting therefor a suitable and equitable solution in order to
carry out the intent and purpose of such invalid provision; provided, however,
that the validity and enforceability of any such provision in every other
respect and of the remaining provisions contained herein shall not be in any way
impaired thereby, it being intended that all of the rights and privileges of the
parties hereto shall be enforceable to the fullest extent permitted by law.

       (h)  The Section headings contained in this Agreement are for reference
only and shall not affect the meaning or interpretation of this Agreement.

       (i)  Any dispute, controversy or claim arising out of or relating to this
Agreement or the breach, termination or validity hereof, or any transaction
contemplated hereby shall be settled in accordance with the procedures set forth
in Article VIII of the Separation Agreement as if such Article VIII were set
forth herein in its entirety.

                                       6
<PAGE>

  IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date set forth above.


                              IDT CORPORATION

                              By: /s/ Hal Brecher
                                 --------------------------------
                              Name:  Hal Brecher
                              Title:  Chief Operating Officer


                              NET2PHONE, INC.

                              By: /s/ Howard Balter
                                 --------------------------------
                              Name: Howard Balter
                              Title: Chief Executive Officer


                                       7
<PAGE>

                                   Exhibit 1
                                   ---------

                  Services to be Provided by IDT to Net2Phone

General Accounting Services
- ---------------------------

Accounts payable and general ledger services, similar to those furnished by IDT
to Net2Phone as of the date of this Agreement, will be provided by IDT to
Net2Phone.  Such Services will consist of, among other things, the following:
(a) receipt and opening of all vendor mail; (b) maintenance of a vendor master
file; (c) processing and forwarding payment of all vendor invoices; (d) invoice
exception reporting and resolution; (e) monthly financial reporting; (f) vendor
relations; and (g) processing credit card transactions.

This category of Services may be cancelled, in whole or in part, by either party
on thirty (30) days' prior written notice.

     Amount to be paid by Net2Phone:
     ------------------------------
          (a)  Employee Cost:  for each IDT employee assigned to render the
               -------------
          foregoing services, such employee's salary for the month multiplied by
          the percentage of such employee's work month actually spent rendering
          such Services (such percentage to be calculated based upon time-cards
          or some other mutually agreed upon system); plus

          (b)  Overhead Factor:  20% of each product calculated in (a) above.
               ----------------


Payroll and Benefit Administration
- ----------------------------------

IDT will administer Net2Phone's payroll.  IDT will also continue to include
Net2Phone's employees under IDT's group health insurance policies until
Net2Phone has established its own benefit plan for its employees with respect to
group health insurance or, if sooner, the termination of this Agreement.  In
addition to the cost of administration of such group health insurance, Net2Phone
will reimburse IDT for the employer's monthly costs of health insurance
attributable to each eligible Net2Phone employee participating in IDT's health
insurance plan.  Further, IDT will continue to permit Net2Phone's employees to
participate in IDT's 401(k) Savings and Retirement Plan until the termination of
this Agreement or such earlier time as Net2Phone establishes its own 401(k) for
its employees which Net2Phone agrees to do on or prior to the date on which IDT
ceases to own at least 80% of the stock of Net2Phone.  In addition to the cost
of administration of such 401(k) plan, Net2Phone will reimburse IDT for the
employer's matching contribution and other direct costs attributable to each
eligible Net2Phone employee participating in IDT's 401(k) plan.

                                       1
<PAGE>

This category of Services may be cancelled, in whole or in part, by either party
on thirty (30) days' prior written notice.

     Amount to be paid by Net2Phone:
     ------------------------------
          (a)  Employee Cost:  for each IDT employee assigned to render the
               -------------
          administration of payroll and benefits plans, such employee's salary
          for the month multiplied by the percentage of such employee's work
          month actually spent rendering such Services (such percentage to be
          calculated based upon time-cards or some other mutually agreed upon
          system); plus

          (b)  Overhead Factor:  20% of each product calculated in (a) above;
               ----------------
          plus

          (c)  Direct Costs:  reimbursement of IDT's direct costs as set forth
               -------------
          above.


Customer Support
- ----------------

IDT shall provide customer support for Net2Phone's Phone2Phone customers which
shall include answering all customer inquiries (such as billing inquiries),
payment processing, rate questions, accommodating dissatisfied customers,
providing technical feedback to Network Operations Center about any quality or
technical problems and offering e-mail support.  Customer service support will
be available 24 hours per day, seven days per week.  Sales support will be
available 16 hours per day, five days per week.

This category of Services may be cancelled by either party on thirty (30) days'
prior written notice.

     Amount to be paid by Net2Phone:
     ------------------------------
          (a)  Employee Cost:  for each IDT employee assigned to render the
               -------------
          foregoing services, such employee's salary for the month multiplied by
          the percentage of such employee's work month actually spent rendering
          such Services (such percentage to be calculated based upon time-cards
          or some other mutually agreed upon system); plus

          (b)  Overhead Factor:  20% of each product calculated in (a) above.
               ----------------


LAN Services
- ------------

IDT shall provide Local Area Network services to Net2Phone, including all
maintenance, installation of new hardware and software (or upgrades thereto) and
consultation on acquisition of new equipment.

This category of Services may be cancelled by either party on thirty (30) days'
prior

                                       2
<PAGE>

written notice.

     Amount to be paid by Net2Phone:
     ------------------------------
          (a)  Employee Cost:  for each IDT employee assigned to render the
               -------------
          foregoing services, such employee's salary for the month multiplied by
          the percentage of such employee's work month actually spent rendering
          such Services (such percentage to be calculated based upon time-cards
          or some other mutually agreed upon system); plus

          (b)  Overhead Factor:  20% of each product calculated in (a) above.
               ----------------

                                       3

<PAGE>

                                                                    EXHIBIT 10.9



                          NET2PHONE SERVICES AGREEMENT


     NET2PHONE SERVICES AGREEMENT, dated as of May 7, 1999 (this "Agreement"),
by and between IDT Corporation, a Delaware corporation ("IDT"), and Net2Phone,
Inc., a Delaware corporation ("Net2Phone").

     WHEREAS, Net2Phone is currently a subsidiary of IDT and provides certain
services to IDT;

     WHEREAS, Net2Phone and IDT expect that equity interests in Net2Phone may be
sold to additional investors; and

     WHEREAS, IDT desires to continue to obtain services from Net2Phone pursuant
to the terms hereof and Net2Phone desires to continue to provide such services
pursuant to the terms hereof.

     NOW, THEREFORE, in consideration of the premises and mutual promises and
representations contained herein, and other good and valuable consideration, the
sufficiency of which is hereby acknowledged, the parties hereto do mutually
covenant, stipulate and agree as follows:

Section 1.  Services.
            --------

       (a)  Net2Phone shall render to IDT the services described in Exhibit 1
                                                                    ---------
hereto (collectively, the "Services").  The Services shall be rendered by
Net2Phone in conformity with good commercial practice, the terms and conditions
of this Agreement and the reasonable instructions of IDT as set forth in this
Agreement.

       (b)  IDT shall provide to Net2Phone when required all funds, if any,
necessary to perform the Services.

       (c)  Net2Phone shall have no authority pursuant to this Agreement to
commit IDT to any obligation in any manner whatsoever with respect to third
parties, to use IDT's name in any way or to enter into any contracts on behalf
of IDT.

       (d)  In the event that IDT requests services in addition to the Services
provided for herein, and if Net2Phone agrees to provide such services, IDT and
Net2Phone shall negotiate in good faith a fee for such services, which
compensation shall be covered by the final sentence of Section 2(a) hereof;
provided, however, that the fee payable by IDT for such services shall be no
- --------  -------
less favorable to IDT than the charges for comparable services from unaffiliated
third parties.  In the event that the parties agree to additional services, the
scope and duration of such services, and any termination provisions with

                                       1
<PAGE>

respect thereto, shall be described in an addendum to Exhibit 1 and thereafter
                                                      ---------
such services shall be considered Services hereunder. If and to the extent the
parties agree to cancel or terminate any of the Services, such services shall be
deemed deleted from Exhibit 1, with the remaining services thereafter
                    ---------
constituting the Services hereunder.

Section 2.  Compensation.
            ------------

       (a)  IDT shall pay to Net2Phone a fee for each of the Services equal to
the amount set forth in Exhibit 1 corresponding to such service.  In the event
                        ---------
IDT terminates any Service in accordance with the final sentence of Section 3
hereof, the fee for such Service shall no longer be payable for any period
subsequent to the effective date of such termination.  In the event the parties
agree to additional services, such fee shall be payable as provided herein.

       (b)  Within 15 days following the end of each calendar month, Net2Phone
shall submit to IDT for payment a billing invoice setting forth the amount of
fees payable by IDT to Net2Phone for Services rendered during such calendar
month.  IDT shall pay the invoiced amount to Net2Phone within thirty (30) days
following receipt of such invoice by IDT.

Section 3.  Term.
            ----

       The term of this Agreement shall commence on the date hereof and shall
continue for a period of one (1) year (the "Initial Term") and, at the end of
the Initial Term and of each year thereafter, shall automatically renew for an
additional one (1) year period unless one party has given the other party thirty
(30) days' prior written notice terminating this Agreement.  Following the
Initial Term, this Agreement may be terminated at any time at the option of
either IDT or Net2Phone upon thirty (30) days' prior written notice.  Specific
categories of Services may be cancelled as set forth in Exhibit 1.
                                                        ---------

Section 4.  Records and Accounts.
            --------------------

       Net2Phone shall maintain accurate records and accounts of all
transactions relating to the Services performed by it pursuant to this
Agreement.  Such records and accounts shall be maintained separately from
Net2Phone's own records and accounts and shall reflect such information as would
normally be examined by an independent accountant in performing a complete audit
pursuant to United States generally accepted auditing standards for the purpose
of certifying financial statements, and to permit verification thereof by
governmental agencies.  IDT shall have the right to inspect and copy, upon
reasonable notice and at reasonable intervals during Net2Phone's regular office
hours, the separate records and accounts maintained by Net2Phone relating to the
Services.

Section 5.  Directors and Officers of Net2Phone and IDT.
            -------------------------------------------

                                       2
<PAGE>

       (a)  Nothing contained in this Agreement shall be deemed to relieve the
officers and directors of IDT from the performance of their duties or limit the
exercise of their powers in accordance with IDT's Certificate of Incorporation
or the laws of the State of Delaware. The services of Net2Phone's officers and
employees which are rendered to IDT under this Agreement shall at all times be
in accordance with the reasonable instructions of IDT's officers and in
accordance with Net2Phone's historical business practice.

       (b)  Nothing in this Agreement shall limit or restrict the right of any
of Net2Phone's directors, officers or employees to engage in any other business
or devote their time and attention in part to the management or other aspects of
any other business, whether of a similar nature, or to limit or restrict the
right of Net2Phone to engage in any other business or to render services of any
kind to any corporation, firm, individual, trust or association.

Section 6.  Liability; Indemnification.
            --------------------------

       (a)  Net2Phone shall have no liability whatsoever to IDT for any error,
act or omission in connection with the services to be rendered by Net2Phone to
IDT hereunder unless any such error, act or omission derives from willful
misconduct or gross negligence. The parties acknowledge that Article VIII of the
Separation Agreement between the parties hereto, dated the date hereof (the
"Separation Agreement") provides for indemnification obligations relating to
this Agreement and confirm their agreement to be bound by the terms thereof.  IN
NO EVENT SHALL NET2PHONE BE LIABLE TO IDT FOR ANY SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, WITHOUT LIMITATION, LOSS OF PROFITS, REVENUES
OR DATA), WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE) OR
OTHERWISE, WHETHER OR NOT NET2PHONE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.  THE LIABILITY OF NET2PHONE FOR DAMAGES OR ALLEGED DAMAGES HEREUNDER,
WHETHER IN CONTRACT, TORT OR ANY OTHER LEGAL THEORY, IS LIMITED TO, AND WILL NOT
EXCEED, IDT'S DIRECT DAMAGES.

       (b)  Net2Phone is an independent contractor and when its employees act
under the terms of this Agreement, they shall be deemed at all times to be under
the supervision and responsibility of Net2Phone; and, notwithstanding any
reimbursement of labor costs as provided herein or otherwise, no person employed
by Net2Phone and acting under the terms of this Agreement shall be deemed to be
acting as agent or employee of IDT or any customer of IDT for any purpose
whatsoever.

Section 7.  Other Agreements.
            ----------------

       From time to time, IDT may find it necessary or desirable either to enter
into agreements covering services of the type contemplated by this Agreement to
be provided by parties other than Net2Phone or to enter into other agreements
covering functions to be performed by Net2Phone hereunder.  Nothing in this
Agreement shall be deemed to

                                       3
<PAGE>

limit in any way the right of IDT to acquire such services from others or to
enter into such other agreements; provided that in no such event shall the
                                  --------
compensation to be paid to Net2Phone pursuant to Section 2 hereof be reduced on
account thereof unless and until this Agreement is terminated, or the applicable
category of Services set forth in Exhibit 1, is cancelled in accordance with
                                  ---------
Section 3 and Exhibit 1 hereto.
              ---------

Section 8.  Confidentiality.
            ---------------

       Net2Phone agrees to hold in strict confidence, and to use reasonable
efforts to cause its employees and representatives to hold in strict confidence,
all confidential information concerning IDT furnished to or obtained by
Net2Phone in the course of providing the Services (except to the extent that
such information has been (a) in the public domain through no fault of Net2Phone
or (b) lawfully acquired by Net2Phone from sources other than IDT); and
Net2Phone shall not disclose or release any such confidential information to any
person, except its employees, representatives and agents who have a need to know
such information in connection with Net2Phone's performance under this
Agreement, unless (i) such disclosure or release is compelled by the judicial or
administrative process, or (ii) in the opinion of counsel to Net2Phone, such
disclosure or release is necessary pursuant to requirements of law or the
requirements of any governmental entity including, without limitation,
disclosure requirements under the Securities Act of 1933 or the Securities
Exchange Act of 1934, in each case as amended.

Section 9.  Miscellaneous.
            -------------

       (a)  This Agreement may not be transferred or assigned by either party,
whether voluntarily or by operation of law, without the prior written consent of
the other which consent may be withheld in such party's sole discretion.  This
Agreement shall inure to the benefit of and be binding upon all permitted
successors and assigns.

       (b)  This Agreement shall be governed by the laws of the State of New
York (regardless of the laws that might otherwise govern under applicable
principles of conflicts of law) as to all matters, including, but not limited
to, matters of validity, construction, effect, performance and remedies.

       (c)  This Agreement may be executed in counterparts, each of which shall
constitute an original and both of which together shall be deemed to be one and
the same instrument.

       (d)  All notices, requests, demands, waivers and other communications
required or permitted to be given under this Agreement shall be in writing and
shall be deemed to have been duly given if delivered personally or by facsimile
transmission or mailed (certified or registered mail, postage prepaid, return
receipt requested):

  If to IDT, to:        IDT Corporation
                        190 Main Street
                        Hackensack, New Jersey  07601

                                       4
<PAGE>

                        Attention:  Chief Financial Officer
                        Fax No.:  (201) 907-5165

  If to Net2Phone, to:  Net2Phone, Inc.
                        171 Main Street
                        Hackensack, New Jersey  07601
                        Attention:  Chief Financial Officer
                        Fax No.:  (201) 907-5351

or to such other person or address as any party shall specify by notice in
writing to the other party.  All such notices, requests, demands, waivers and
communications shall be deemed to have been received on the date on which hand
delivered, upon transmission of the facsimile transmission by the sender and
issuance by the transmitting machine of a confirmation slip confirming that the
number of pages constituting the notice have been transmitted without error, or
on the third business day following the date on which so mailed, except for a
notice of change of address, which shall be effective only upon receipt thereof.
In the case of a notice sent by facsimile transmission, the sender shall
contemporaneously mail a copy of the notice to the addressee at the address
provided for above.  However, such mailing shall in no way alter the time at
which the facsimile notice is deemed received.  In no event shall the provision
of notice pursuant to this Section 9(d) constitute notice for service of
process.

       (e)  This Agreement and those provisions of the Separation Agreement
specifically referred to herein contain the entire understanding of the parties
hereto with respect to the subject matter of this Agreement. This Agreement and
such referenced provisions of the Separation Agreement supersede all prior
agreements and understandings, oral or written, with respect to the subject
matter of this Agreement.

       (f)  The provisions of Sections 6 and 8 hereof shall survive any
termination of this Agreement.

       (g)  In the event that any one or more of the provisions contained herein
is held invalid or unenforceable in any respect, the parties shall negotiate in
good faith with a view toward substituting therefor a suitable and equitable
solution in order to carry out the intent and purpose of such invalid provision;
provided, however, that the validity and enforceability of any such provision in
every other respect and of the remaining provisions contained herein shall not
be in any way impaired thereby, it being intended that all of the rights and
privileges of the parties hereto shall be enforceable to the fullest extent
permitted by law.

       (h)  The Section headings contained in this Agreement are for reference
only and shall not affect the meaning or interpretation of this Agreement.

       (i)  Any dispute, controversy or claim arising out of or relating to this
Agreement or the breach, termination or validity hereof, or any transaction
contemplated hereby shall be settled in accordance with the procedures set forth
in Article VIII of the Separation

                                       5
<PAGE>

Agreement as if such Article VIII were set forth herein in its entirety.

                                       6
<PAGE>

  IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date set forth above.

                              IDT CORPORATION

                              By: /s/ Hal Brecher
                                 --------------------------------
                              Name:  Hal Brecher
                              Title:  Chief Operating Officer


                              NET2PHONE, INC.

                              By: /s/ Howard Balter
                                 --------------------------------
                              Name: Howard Balter
                              Title: Chief Executive Officer

                                       7

<PAGE>

                                   Exhibit 1
                                   ---------

                  Services to be Provided by Net2Phone to IDT

Debit Card Platform Services
- ----------------------------

Net2Phone shall support IDT's Debit Card Platform including: (1) providing
technical support for the debit card platform; (2) ordering lines to handle
calls (WorldCom, Piscataway, etc.); (3) managing database for the platform; and
(4) monitoring network, 24 hours per day, seven days per week.  IDT shall be
responsible for the cost of any and all additional or replacement equipment
needed for the Debit Card Platform and shall be responsible for the cost of
maintaining and supporting all existing or new equipment required for the Debit
Card Platform.  IDT shall reimburse Net2Phone for any cost incurred by Net2Phone
in the acquisition, maintenance or support of such equipment.

This category of Services may be cancelled by either party on thirty (30) days'
prior written notice and may be renewed by mutual agreement of the parties.

     Amount to be paid by IDT:
     ------------------------
     (a)  Direct Costs:  reimbursement of Net2Phone's direct costs as set forth
          ------------
     above; plus

     (b)  On a monthly basis, the greater of:
          (i)    (A)  Employee Cost:  for each Net2Phone employee assigned to
                      -------------
          render the foregoing services, such employee's salary for the month
          multiplied by the percentage of such employee's work month actually
          spent rendering such Services (such percentage to be calculated based
          upon time-cards or some other mutually agreed upon system) plus (B)
          Overhead Factor of 20% of each product calculated in the foregoing
          ---------------
          clause (A) or

          (ii)   Usage of Debit Card Platform:  $.0025 per minute of IDT use of
                 -----------------------------
          the Debit Card Platform during such month.

                                       1

<PAGE>

                                                                   EXHIBIT 10.12

                              SEPARATION AGREEMENT
                              --------------------


     THIS SEPARATION AGREEMENT, dated as of May 7, 1999, is by and between IDT
Corporation, a Delaware corporation ("IDT"), and Net2Phone, Inc., a Delaware
corporation ("Net2Phone"). Capitalized terms used herein and not otherwise
defined shall have the respective meanings assigned to them in Article I hereof.

     WHEREAS, Net2Phone is currently a subsidiary of IDT;

     WHEREAS, the Board of Directors of IDT has determined that it is
appropriate and desirable to cause Net2Phone to offer and sell for its own
account equity interests in Net2Phone to additional investors;

     WHEREAS, IDT has historically provided various services to Net2Phone on an
informal basis and, in connection with the separation of IDT and Net2Phone, the
parties desire to formalize certain relationships which will continue as
described herein; and

     WHEREAS, it is appropriate and desirable to set forth the principal
corporate transactions required to effect the separation, and certain other
agreements that will govern certain matters relating to the relationship of IDT
and Net2Phone following the sale of equity to additional investors.

     NOW, THEREFORE, for good and valuable consideration, the sufficiency of
which is hereby acknowledged, the parties, intending to be legally bound, agree
as follows:


                                   ARTICLE I
                                  DEFINITIONS

     For the purpose of this Agreement the following terms shall have the
following meanings:

     1.1.  "Action" means any demand, action, suit, countersuit, arbitration,
inquiry, proceeding or investigation by or before any federal, state, local,
foreign or international Governmental Authority or any arbitration or mediation
tribunal.

     1.2.  "Affiliate" of any Person means a Person that controls, is controlled
by, or is under common control with such Person. As used herein, "control" means
the possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of such entity, whether through
ownership of voting securities or other interests, by contract or otherwise.

     1.3.  "Agreement" means this Separation Agreement, including all of the
Schedules hereto.
<PAGE>

     1.4.  "Ancillary Agreements" means (a) the IDT Services Agreement, dated as
of the date hereof, by and between IDT and Net2Phone, (b) the Net2Phone Services
Agreement, dated the date hereof, by and between IDT and Net2Phone, (c) the
Internet/Telecommunications Agreement, dated the date hereof, by and between IDT
and Net2Phone, (d) the Joint Marketing Agreement, dated the date hereof, by and
between IDT and Net2Phone, (e) the Assignment Agreement, dated as of the date
hereof, by and between IDT and Net2Phone, (f) the Tax Sharing and
Indemnification Agreement, dated as of the date hereof, by and between IDT and
Net2Phone, and (g) the Assignment and Assumption Agreement, dated as of the date
hereof, by and between IDT and Net2Phone.

     1.5.  "Applicable Deadline" has the meaning set forth in Section 8.3(b).

     1.6.  "Arbitration Act" means the United States Arbitration Act, 9 U.S.C.
1- 14, as the same may be amended from time to time.

     1.7.  "Arbitration Demand Date" has the meaning set forth in Section
8.3(a).

     1.8.  "Arbitration Demand Notice" has the meaning set forth in Section
8.3(a).

     1.9.  "Code" means the Internal Revenue Code of 1986, as amended.

     1.10. "Commission" means the United States Securities and Exchange
Commission.

     1.11. "Consents" means any consent, waiver or approval from, or
notification requirements to, any third party.

     1.12. "CPR" means the Center for Public Resources.

     1.13. "Environmental Law" means any federal, state, local, foreign or
international statute, ordinance, rule, regulation, code, license, permit,
authorization, approval, consent, common law (including tort and environmental
nuisance law), legal doctrine, order, judgment, decree, injunction, requirement
or agreement with any Governmental Authority, now or hereafter in effect
relating to health, safety, pollution or the environment (including ambient air,
surface water, groundwater, land surface or subsurface strata) or to emissions,
discharges, releases or threatened releases of any substance currently or at any
time hereafter listed, defined, designated or classified as hazardous, toxic
waste, radioactive or dangerous, or otherwise regulated, under any of the
foregoing, or otherwise relating to the manufacture, processing, distribution,
use, treatment, storage, disposal, transport or handling of any such substances,
including the Comprehensive Environmental Response, Compensation and Liability
Act, the Superfund Amendments and Reauthorization Act and the Resource
Conservation and Recovery Act and comparable provisions in state, local, foreign
or international law.

     1.14. "Environmental Liabilities" means all Liabilities relating to,
arising out of or resulting from any Environmental Law or contract or agreement
relating to environmental, health or safety matters (including all removal,
remediation or cleanup costs, investigatory costs, governmental response costs,
natural resources damages,

                                       2
<PAGE>

property damages, personal injury damages, costs of compliance with any
settlement, judgment or other determination of Liability and indemnity,
contribution or similar obligations) and all costs and expenses (including
allocated costs of in-house counsel and other personnel), interest, fines,
penalties or other monetary sanctions in connection therewith.

     1.15.  "Escalation Notice" has the meaning set forth in Section 8.2.

     1.16.  "Exchange Act" means the Securities Exchange Act of 1934, as
amended, together with the rules and regulations promulgated thereunder.

     1.17.  "Governmental Approval" means any notice, report or other filing to
be made, or any consent, registration, approval, permit or authorization to be
obtained from, any Governmental Authority.

     1.18.  "Governmental Authority" means any federal, state, local, foreign or
international court, government, department, commission, board, bureau, agency,
official or other regulatory, administrative or governmental authority.

     1.19.  "IDT Group" means IDT and each Person (other than any member of the
Net2Phone Group) that is an Affiliate of IDT on the date hereof.

     1.20.  "IDT Indemnitees" has the meaning set forth in Section 5.2

     1.21.  "Indemnifying Party" has the meaning set forth in Section 5.4(a).

     1.22.  "Indemnitee" has the meaning set forth in Section 5.4(a).

     1.23.  "Indemnity Payment" has the meaning set forth in Section 5.4(a).

     1.24.  "Information" means information, whether or not patentable or
copyrightable, in written, oral, electronic or other tangible or intangible
forms, stored in any medium, including studies, reports, records, books,
contracts, instruments, surveys, discoveries, ideas, concepts, know-how,
techniques, designs, specifications, drawings, blueprints, diagrams, models,
prototypes, samples, flow charts, data, computer data, disks, diskettes, tapes,
computer programs or other software, marketing plans, customer names,
communications by or to attorneys (including attorney-client privileged
communications), memos and other materials prepared by attorneys or under their
direction (including attorney work product), and other technical, financial,
employee or business information or data.

     1.25.  "Insurance Policies" means the insurance policies written by
insurance carriers unaffiliated with IDT pursuant to which members of the
Net2Phone Group (or their respective officers or directors) will be insured
parties after the date hereof.

     1.26.  "Insurance Proceeds" means those monies:

            (a) received by an insured from an insurance carrier; or

                                       3
<PAGE>

            (b) paid by an insurance carrier on behalf of the insured;

in any such case net of any applicable premium adjustments (including reserves
and retrospectively rated premium adjustments) and net of any costs or expenses
incurred in the collection thereof.

     1.27.  "Liabilities" means any and all losses, claims, charges, debts,
demands, actions, causes of action, suits, damages, obligations, payments, costs
and expenses, sums of money, accounts, reckonings, bonds, specialties,
indemnities and similar obligations, exonerations, covenants, contracts,
controversies, agreements, promises, doings, omissions, variances, guarantees,
make whole agreements and similar obligations, and other liabilities, including
all contractual obligations, whether absolute or contingent, matured or
unmatured, liquidated or unliquidated, accrued or unaccrued, known or unknown,
whenever arising, and including those arising under any law, rule, regulation,
Action, threatened or contemplated Action (including the costs and expenses of
demands, assessments, judgments, settlements and compromises relating thereto
and attorneys' fees and any and all costs and expenses (including allocated
costs of in-house counsel and other personnel), whatsoever reasonably incurred
in investigating, preparing or defending against any such Actions or threatened
or contemplated Actions), order or consent decree of any Governmental Authority
or any award of any arbitrator or mediator of any kind, and those arising under
any contract, commitment or undertaking, including those arising under this
Agreement or any Ancillary Agreement, in each case, whether or not recorded or
reflected or required to be recorded or reflected on the books and records or
financial statements of any Person.

     1.28.  "Net2Phone Business" means the business of Net2Phone as presently
conducted and as more fully described on Exhibit A hereto.
                                         ---------

     1.29.  "Net2Phone Common Stock" means the common stock, $.01 par value per
share, of Net2Phone.

     1.30.  "Net2Phone Group" means Net2Phone, each Subsidiary of Net2Phone and
each other Person that is either controlled directly or indirectly by Net2Phone
on the date hereof.

     1.31.  "Net2Phone Indemnitees" has the meaning set forth in Section 5.3(a).

     1.32.  "Person" means an individual, a general or limited partnership, a
corporation, a trust, a joint venture, an unincorporated organization, a limited
liability entity, any other entity and any Governmental Authority.

     1.33.  "Prime Rate" means the rate which Chase Manhattan Bank (or any
successor thereto or other major money center commercial bank agreed to by the
parties hereto) announces from time to time as its prime lending rate, as in
effect from time to time.

     1.34.  "Securities Act" means the Securities Act of 1933, as amended,
together with the rules and regulations promulgated thereunder.

                                       4
<PAGE>

     1.35.  "Security Interest" means any mortgage, security interest, pledge,
lien, charge, claim, option, right to acquire, voting or other restriction,
right-of-way, covenant, condition, easement, encroachment, restriction on
transfer, or other encumbrance of any nature whatsoever.

     1.36.  "Subsidiary of any Person" means any corporation or other
organization whether incorporated or unincorporated of which at least a majority
of the securities or interests having by the terms thereof ordinary voting power
to elect at least a majority of the board of directors or others performing
similar functions with respect to such corporation or other organization is
directly or indirectly owned or controlled by such Person or by any one or more
of its Subsidiaries, or by such Person and one or more of its Subsidiaries;
provided, however, that no Person shall be deemed to be a Subsidiary of such
- --------  -------
other Person unless such other Person controls, or has the right, power or
ability to control, that Person.

     1.37.  "Tax Agreement" means the Tax Sharing and Indemnification Agreement,
dated as of the date hereof, by and between IDT and Net2Phone.

     1.38.  "Taxes" has the meaning set forth in the Tax Agreement.

     1.39.  "Third Party Claim" has the meaning set forth in Section 5.5(a).

                                   ARTICLE II
                            ANCILLARY AGREEMENTS AND
                                 TAX AGREEMENT

     2.1.  ANCILLARY AGREEMENTS.  Prior to the date hereof, IDT has provided
Net2Phone with administration (accounting, human resources, legal), customer
service, Internet/telecom, and marketing services and Net2Phone has provided IDT
with marketing and certain technical support services.  Net2Phone and IDT will
enter into the Ancillary Agreements pursuant to which IDT will provide certain
of such services to Net2Phone for those periods of time set forth in the
respective Ancillary Agreements and Net2Phone will provide certain of such
services to IDT for those periods of time set forth in the respective Ancillary
Agreements.  Effective as of the date hereof, each of IDT and Net2Phone will
execute and deliver all of the Ancillary Agreements and the Tax Agreement.

                                  ARTICLE III
                             INTER-COMPANY LICENSES

     3.1  The parties may desire to provide each other from time to time, at
their sole and absolute discretion, certain software, know-how, or other
technology for which they have the rights to grant licenses to third parties
("Shared Technology") for use in the other party's business.  To provide Shared
Technology, the party granting rights (the "Granting Party") to such Shared
Technology will identify the specific Shared Technology to be provided to the
other party (the "Receiving Party") in a written notice (the "License Notice"),
signed by a duly authorized representative of the Granting Party,

                                       5
<PAGE>

which references this Agreement and states that a license to such Shared
Technology is being granted to the Receiving Party pursuant to the terms of this
Agreement. The specific Shared Technology licensed pursuant to a given License
Notice will be licensed under the following terms and conditions unless stated
otherwise in such License Notice (provided that any changed or additional terms
therein shall be subject to signed approval by both the Granting Party and the
Receiving Party):

     (a) LICENSE GRANT.  Granting Party will grant to Receiving Party a non-
exclusive, non-transferable, royalty-free, revocable license to use, make, copy
and practice the Shared Technology designated in the License Notice solely for
internal business purposes.  The term of the license granted herein shall be
indefinite, provided, however, that Granting Party may revoke such license upon
thirty (30) days prior written notice at any time and for any reason, or for no
reason.

     (b) LIMITATIONS ON RIGHTS.  Receiving Party will not modify, create
derivative works based upon, translate, decompile, disassemble or otherwise
reverse engineer, distribute, transfer, time-share, service bureau or otherwise
provide any third parties access to, the Shared Technology licensed to it
pursuant to an applicable License Notice, or permit any third party to do any of
the foregoing..

     (c) PROPRIETARY RIGHTS.  Granting Party will retain all right, title and
interest in and to the Shared Technology, and no right, title or interest will
be deemed to be granted or transferred to Receiving Party, except as expressly
provided for above or in the applicable License Notice.  Receiving Party agrees
to retain or reproduce any proprietary rights notices on all copies of the
Shared Technology that it possesses or makes.

     (d) NO WARRANTY.  EXCEPT AS OTHERWISE PROVIDED IN AN APPLICABLE LICENSE
NOTICE, THE SHARED TECHNOLOGY IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND
AND THE PARTIES HEREBY DISCLAIM ALL WARRANTIES OF ANY KIND WITH RESPECT TO ANY
OF THE SHARED TECHNOLOGY, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

     (e) LIMITATION OF LIABILITY.  EXCEPT AS OTHERWISE PROVIDED IN AN APPLICABLE
LICENSE NOTICE, NEITHER PARTY WILL BE LIABLE TO THE OTHER FOR ANY CONSEQUENTIAL,
INCIDENTAL, SPECIAL, INDIRECT, EXEMPLARY OR PUNITIVE DAMAGES OF ANY KIND WITH
RESPECT TO THE SHARED TECHNOLOGY, EVEN IF SUCH PARTY IS NOTIFIED OF THE
POSSIBILITY OF SUCH DAMAGES.

                                       6
<PAGE>

                                   ARTICLE IV
                     OFFICE FURNITURE AND OFFICE EQUIPMENT

     4.1  All office furniture and office equipment used by Net2Phone and
located in its premises on the date hereof shall continue in the possession of
Net2Phone.  To the extent that any such office furniture or office equipment is,
or becomes, legally owned by IDT, IDT hereby transfers all its right, title and
interest therein to Net2Phone effective, with respect to such furniture and
equipment currently owned by IDT, on the date hereof and effective, with respect
to any such furniture and equipment which becomes owned by IDT at a future, on
such date  To the extent that any such office furniture or office equipment is
leased by IDT, IDT hereby affirms its intent that such furniture and equipment
is part of IDT's capital contribution to Net2Phone and indemnifies Net2Phone
from any and all claims whenever raised by any lessor of such furniture and
equipment.

                                   ARTICLE V
                                INDEMNIFICATION

     5.1.  RELEASE OF EXISTING CLAIMS. (a) Except as provided in Section 5.1(c),
effective as of the date hereof, Net2Phone does hereby, for itself, its
respective Affiliates (other than any member of the IDT Group), successors and
assigns, and all Persons who at any time prior to the date hereof have been
stockholders, directors, officers, agents or employees of any member of the
Net2Phone Group (in each case, in their respective capacities as such), remise,
release and forever discharge each of IDT, its respective Affiliates (other than
any member of the Net2Phone Group), successors and assigns, and all prior,
current or future stockholders, directors, officers, agents or employees of IDT
(in each case, in their respective capacities as such), and their respective
heirs, executors, administrators, successors and assigns, from any and all
Liabilities whatsoever, whether at law or in equity (including any right of
contribution), whether arising under any contract or agreement, by operation of
law or otherwise, existing or arising from all acts and events occurring or
failing to occur or alleged to have occurred or to have failed to occur and all
conditions existing or alleged to have existed on or before the date hereof
between Net2Phone and IDT (including any contractual arrangements or
arrangements existing or alleged to exist between them on or before the date
hereof).

     (b) Except as provided in Section 5.1(c), effective as of the date hereof,
IDT does hereby, for itself and its Affiliates (other than any member of the
Net2Phone Group), successors and assigns, and all Persons who at any time prior
to the date hereof have been stockholders, directors, officers, agents or
employees of any member of the IDT Group (in each case, in their respective
capacities as such), remise, release and forever discharge Net2Phone, the
respective members of the Net2Phone Group, their respective Affiliates (other
than any member of the IDT Group), successors and assigns, and all prior,
current or future stockholders, directors, officers, agents or employees of any
member of the Net2Phone Group (in each case, in their respective capacities as
such), and their respective heirs, executors, administrators, successors and
assigns, from any and all Liabilities whatsoever, whether at law or in equity
(including any right of

                                       7
<PAGE>

contribution), whether arising under any contract or agreement, by operation of
law or otherwise, existing or arising from all acts and events occurring or
failing to occur or alleged to have occurred or to have failed to occur and all
conditions existing or alleged to have existed on or before the date hereof
between Net2Phone and IDT (including any contractual arrangements or
arrangements existing or alleged to exist between them on or before the date
hereof).

     (c) Nothing contained in Section 5.1(a) or (b) shall impair any right of
any Person to enforce this Agreement, any Ancillary Agreement, or the Tax
Agreement. Nothing contained in Section 5.1(a) or (b) shall release any Person
from:

     (i)   any Liability, contingent or otherwise, assumed, transferred,
assigned or allocated to the Group of which such Person is a member in
accordance with, or any other Liability of any member of any Group under, this
Agreement, any Ancillary Agreement or the Tax Agreement;

     (ii)  any Liability for the sale, lease, construction or receipt of goods,
property or services purchased, obtained or used in the ordinary course of
business by a member of one Group from a member of any other Group prior to the
date hereof;

     (iii) any Liability for unpaid amounts for products or services or refunds
owing on products or services due on a value-received basis for work done by a
member of one Group at the request or on behalf of a member of another Group;

     (iv)  any Liability that the parties may have with respect to
indemnification or contribution pursuant to this Agreement for claims brought
against the parties by third Persons, which Liability shall be governed by the
provisions of this Article V and Article VI and, if applicable, the appropriate
provisions of the Ancillary Agreements; or

     (v)   in the case of Net2Phone, outstanding unpaid amounts as of the date
hereof advanced to Net2Phone for working capital and fixed asset purchases and
to reimburse IDT for bank finance charges incurred not to exceed $14 million, $7
million of which will be repaid with proceeds from Net2Phone's sale of equity in
connection with its proposed initial public offering, with the remaining $7
million being repaid in full not later than 60 months following the date hereof,
self amortizing at the interest rate of 9% per annum in equal monthly payments.

     (vi)  in the case of Net2Phone, $7 million which was advanced by IDT to
Netscape and $1 million which was advanced to IBM all of which will be repaid by
Net2Phone to IDT out of the proceeds of the private offering.

     (vii) any Liability the release of which would result in the release of
any Person other than a Person released pursuant to this Section 5.1; provided
that the parties agree not to bring suit or permit any of their Subsidiaries to
bring suit against any Person with respect to any Liability to the extent that
such Person would be released with respect to such Liability by this Section 5.1
but for the provisions of this clause (vi).

     (viii) in the case if IDT, any Liability to Clifford Sobel pursuant to his

                                       8
<PAGE>

employment agreement (including option and stock conversion rights thereunder)
or to any Net2Phone employee as a result of rights of such employee any employee
benefit plan, including any stock option plan.

     (d) Net2Phone shall not make, and shall not permit any member of the
Net2Phone Group to make, any claim or demand, or commence any Action asserting
any claim or demand, including any claim of contribution or any indemnification,
against IDT or any member of the IDT Group or any other Person released pursuant
to Section 5.1(a), with respect to any Liabilities released pursuant to Section
5.1(a). IDT shall not, and shall not permit any member of the IDT Group, to make
any claim or demand, or commence any Action asserting any claim or demand,
including any claim of contribution or any indemnification, against Net2Phone or
any member of the Net2Phone Group, or any other Person released pursuant to
Section 5.1(b), with respect to any Liabilities released pursuant to Section
5.1(b).

     (e) It is the intent of each of IDT and Net2Phone by virtue of the
provisions of this Section 5.1 to provide for a full and complete release and
discharge of all Liabilities existing or arising from all acts and events
occurring or failing to occur or alleged to have occurred or to have failed to
occur and all conditions existing or alleged to have existed on or before the
date hereof, between or among Net2Phone or any member of the Net2Phone Group, on
the one hand, and IDT or any member of the IDT Group, on the other hand
(including any contractual agreements or arrangements existing or alleged to
exist between or among any such members on or before the date hereof), except as
expressly set forth in Section 5.1(c). At any time, at the request of any other
party, each party shall cause each member of its respective Group to execute and
deliver releases reflecting the provisions hereof.

     5.2.  INDEMNIFICATION BY NET2PHONE. Except as provided in Section 5.4,
Net2Phone shall indemnify, defend and hold harmless IDT, each member of the IDT
Group and each of their respective directors, officers and employees (in each
case, in their respective capacities as such), and each of the heirs, executors,
successors and assigns of any of the foregoing (collectively, the "IDT
Indemnitees"), from and against any and all Liabilities of the IDT Indemnitees
relating to, arising out of or resulting from any of the following items
(without duplication):

     (a) the failure of Net2Phone or any other member of the Net2Phone Group or
any other Person to pay, perform or otherwise promptly discharge any liabilities
of Net2Phone in accordance with their respective terms, whether prior to or
after the date hereof; and

     (b) any breach by Net2Phone or any member of the Net2Phone Group of this
Agreement, any of the Ancillary Agreements or the Tax Agreement; provided,
                                                                 ---------
however, that Net2Phone shall not be financially responsible hereunder for any
- --------
special, incidental, consequential or other similar type of damage to the extent
that such damages are specifically excluded in such agreement.

     5.3.  INDEMNIFICATION BY IDT.  Except as otherwise provided in Section

                                       9
<PAGE>

5.4, IDT shall indemnify, defend and hold harmless Net2Phone, each member of the
Net2Phone Group and each of their respective directors, officers and employees
(in each case, in their respective capacities as such), and each of the heirs,
executors, successors and assigns of any of the foregoing (collectively, the
"Net2Phone Indemnitees"), from and against any and all Liabilities of the
Net2Phone Indemnitees relating to, arising out of or resulting from any of the
following items (without duplication):

     (a) the failure of IDT or any other member of the IDT Group or any other
Person to pay, perform or otherwise promptly discharge any Liabilities of the
IDT Group, whether prior to or after the date hereof; and

     (b) any breach by IDT or any member of the IDT Group of this Agreement, any
of the Ancillary Agreements or the Tax Agreement; provided, however, that IDT
                                                  ------------------
shall not be financially responsible hereunder for any special, incidental,
consequential or other similar type of damage to the extent that such damages
are specifically excluded in such agreement.

     5.4.  INDEMNIFICATION OBLIGATIONS NET OF INSURANCE PROCEEDS AND OTHER
AMOUNTS.  (a) The parties intend that any Liability subject to indemnification
or reimbursement pursuant to this Article V or Article VI will be net of
Insurance Proceeds that actually reduce the amount of the Liability.
Accordingly, the amount which any party (an "Indemnifying Party") is required to
pay to any Person entitled to indemnification hereunder (an "Indemnitee") will
be reduced by any Insurance Proceeds theretofore actually recovered by or on
behalf of the Indemnitee in reduction of the related Liability.  If an
Indemnitee receives a payment (an "Indemnity Payment") required by this
Agreement from an Indemnifying Party in respect of any Liability and
subsequently receives Insurance Proceeds, then the Indemnitee will pay to the
Indemnifying Party an amount equal to the excess of the Indemnity Payment
received over the amount of the Indemnity Payment that would have been due if
the Insurance Proceeds had been received, realized or recovered before the
Indemnity Payment was made.

     (b) An insurer who would otherwise be obligated to pay any claim shall not
be relieved of the responsibility with respect thereto or, solely by virtue of
the indemnification provisions hereof, have any subrogation rights with respect
thereto, it being expressly understood and agreed that no insurer or any other
third party shall be entitled to a "windfall" (i.e., a benefit they would not be
entitled to receive in the absence of the indemnification provisions) by virtue
of the indemnification provisions hereof. Nothing contained in this Agreement,
any Ancillary Agreement or the Tax Agreement shall obligate any member of any
Group to seek to collect or recover any Insurance Proceeds.

     5.5.  PROCEDURES FOR INDEMNIFICATION OF THIRD PARTY CLAIMS. (a) If an
Indemnitee shall receive notice or otherwise learn of the assertion by a Person
(including any Governmental Authority) who is not a member of the IDT Group or
the Net2Phone Group of any claim or of the commencement by any such Person of
any Action (collectively, a "Third Party Claim") with respect to which an
Indemnifying

                                       10
<PAGE>

Party may be obligated to provide indemnification to such Indemnitee pursuant to
Section 5.2 or 5.3, or any other Section of this Agreement, any Ancillary
Agreement or the Tax Agreement, such Indemnitee shall give such Indemnifying
Party written notice thereof within 20 days after becoming aware of such Third
Party Claim. Any such notice shall describe the Third Party Claim in reasonable
detail. Notwithstanding the foregoing, the failure of any Indemnitee or other
Person to give notice as provided in this Section 5.5(a) shall not relieve the
related Indemnifying Party of its obligations under this Article V, except to
the extent that such Indemnifying Party is actually prejudiced by such failure
to give notice.

     (b) An Indemnifying Party may elect to defend (and, unless the Indemnifying
Party has specified any reservations or exceptions, to seek to settle or
compromise), at such Indemnifying Party's own expense and by such Indemnifying
Party's own counsel, any Third Party Claim. Within 30 days after the receipt of
notice from an Indemnitee in accordance with Section 5.5(a) (or sooner, if the
nature of such Third Party Claim so requires), the Indemnifying Party shall
notify the Indemnitee of its election whether the Indemnifying Party will assume
responsibility for defending such Third Party Claim, which election shall
specify any reservations or exceptions. After notice from an Indemnifying Party
to an Indemnitee of its election to assume the defense of a Third Party Claim,
such Indemnitee shall have the right to employ separate counsel and to
participate in (but not control) the defense, compromise, or settlement thereof,
but the fees and expenses of such counsel shall be the expense of such
Indemnitee except as set forth in the next sentence. In the event that the
Indemnifying Party has elected to assume the defense of the Third Party Claim
but has specified, and continues to assert, any reservations or exceptions in
such notice, then, in any such case, the reasonable fees and expenses of one
separate counsel for all Indemnitees shall be borne by the Indemnifying Party.

     (c) If an Indemnifying Party elects not to assume responsibility for
defending a Third Party Claim, or fails to notify an Indemnitee of its election
as provided in Section 5.5(b), such Indemnitee may defend such Third Party Claim
at the cost and expense of the Indemnifying Party.

     (d) Unless the Indemnifying Party has failed to assume the defense of the
Third Party Claim in accordance with the terms of this Agreement, no Indemnitee
may settle or compromise any Third Party Claim without the consent of the
Indemnifying Party, which consent shall not be unreasonably withheld.

     (e) No Indemnifying Party shall consent to entry of any judgment or enter
into any settlement of the Third Party Claim without the consent of the
Indemnitee if the effect thereof is to permit any injunction, declaratory
judgment, other order or other nonmonetary relief to be entered, directly or
indirectly, against any Indemnitee.

     (f) The provisions of Section 5.5 and Section 5.6 shall not apply to Taxes
(which are covered by the Tax Agreement).

     5.6.  ADDITIONAL MATTERS. (a) Any claim on account of a Liability which

                                       11
<PAGE>

does not result from a Third Party Claim shall be asserted by written notice
given by the Indemnitee to the related Indemnifying Party. Such Indemnifying
Party shall have a period of 30 days after the receipt of such notice within
which to respond thereto. If such Indemnifying Party does not respond within
such 30-day period, such Indemnifying Party shall be deemed to have refused to
accept responsibility to make payment. If such Indemnifying Party does not
respond within such 30-day period or rejects such claim in whole or in part,
such Indemnitee shall be free to pursue such remedies as may be available to
such party as contemplated by this Agreement, the Ancillary Agreements and the
Tax Agreement.

     (b) In the event of payment by or on behalf of any Indemnifying Party to
any Indemnitee in connection with any Third Party Claim, such Indemnifying Party
shall be subrogated to and shall stand in the place of such Indemnitee as to any
events or circumstances in respect of which such Indemnitee may have any right,
defense or claim relating to such Third Party Claim against any claimant or
plaintiff asserting such Third Party Claim or against any other person. Such
Indemnitee shall cooperate with such Indemnifying Party in a reasonable manner,
and at the cost and expense (including allocated costs of in-house counsel and
other personnel) of such Indemnifying Party, in prosecuting any subrogated
right, defense or claim.

     (c) In the event of an Action in which the Indemnifying Party is not a
named defendant, if the Indemnifying Party shall so request, the parties shall
endeavor to substitute the Indemnifying Party for the named defendant if at all
practicable. If such substitution or addition cannot be achieved for any reason
or is not requested, the named defendant shall allow the Indemnifying Party to
manage the Action as set forth in this Section and the Indemnifying Party shall
fully indemnify the named defendant against all costs of defending the Action
(including court costs, sanctions imposed by a court, attorneys' fees, experts'
fees and all other external expenses), the costs of any judgment or settlement,
and the cost of any interest or penalties relating to any judgment or
settlement.

     5.7.  REMEDIES CUMULATIVE.  The remedies provided in this Article V shall
be cumulative and, subject to the provisions of Article VIII, shall not preclude
assertion by any Indemnitee of any other rights or the seeking of any and all
other remedies against any Indemnifying Party.

     5.8.  SURVIVAL OF INDEMNITIES.  The rights and obligations of each of IDT
and Net2Phone and their respective Indemnitees under this Article V shall
survive the sale or other transfer by any party of any Assets or businesses or
the assignment by it of any Liabilities.

     5.9   UNAVAILABILITY OF INDEMNITY.  If the indemnification provided for in
this Article V is held by a court of competent jurisdiction to be unavailable to
an indemnified party with respect to any Liabilities referred to herein, the
indemnifying party, in lieu of indemnifying such indemnified party hereunder,
agrees to contribute to the amount paid or payable by such indemnified party as
a result of such Liability in such proportion as is appropriate to reflect the
relative fault of the indemnifying party on one

                                       12
<PAGE>

hand and of the indemnified party on the other in connection with the event that
resulted in such Liability, as well as any other relevant equitable
considerations.

                                   ARTICLE VI
                      OPERATIONS AND CERTAIN OTHER MATTERS

     6.1.  INSURANCE MATTERS. (a)  Net2Phone and IDT contemplate that Net2Phone
shall obtain its own Directors and Officers Insurance Policy in a timely manner
following the sale of equity to new investors.  Each of Net2Phone and IDT agree
that Net2Phone may remain on IDT's insurance policies relating to property,
errors and omissions, professional liability, automobile and general liability
until the earlier of such time as Net2Phone no longer qualifies for coverage on
the respective IDT Insurance Policy or, upon thirty (30) days' prior written
notice to IDT, Net2Phone elects to be removed from the IDT Insurance Policy or
Policies.  For so long as Net2Phone is covered by IDT's Insurance Policies,
Net2Phone will pay to IDT each month (prorated on a daily basis for any partial
month) in respect of the period from the date hereof until the termination of
Net2Phone's coverage on all of IDT's Insurance Policies the amount calculated as
set forth on Exhibit B hereto, such amount to be payable in arrears by the 10th
             ---------
day of the next succeeding month, in respect of Insurance Policies under which
Net2Phone will continue to have coverage following the date hereof.  IDT and
Net2Phone agree to cooperate in good faith to provide for the treatment of any
Insurance Policies that will remain in effect following the date hereof on a
mutually agreeable basis.  IDT shall provide Net2Phone with prompt notice in the
event that any Insurance Policy shall be terminated or otherwise cease to be in
effect for any reason.  In no event shall IDT, any other member of the IDT Group
or any IDT Indemnitee have liability or obligation whatsoever to any member of
the Net2Phone Group in the event (i) that any Insurance Policy or other contract
or policy of insurance shall be terminated or otherwise cease to be in effect
for any reason, shall be unavailable or inadequate to cover any Liability of any
member of the Net2Phone Group for any reason whatsoever or shall not be renewed
or extended beyond the current expiration date. or (ii) notwithstanding the
provisions of the immediately preceding sentence, that IDT fails to provide
Net2Phone with notice of any such event.

     (b) (i)  Except as otherwise provided in any Ancillary Agreement, the
parties intend by this Agreement that Net2Phone and each other member of the
Net2Phone Group be successors-in-interest to all rights that any member of the
Net2Phone Group may have as of the date hereof as a subsidiary, affiliate,
division or department of IDT prior to the date hereof under any policy of
insurance issued to IDT by any insurance carrier unaffiliated with IDT or under
any agreements related to such policies executed and delivered prior to the date
hereof, including any rights such member of the Net2Phone Group may have, as an
insured or additional named insured, subsidiary, affiliate, division or
department, to avail itself of any such policy of insurance or any such
agreements related to such policies as in effect prior to the date hereof. At
the request of Net2Phone, IDT shall take all reasonable steps, including the
execution and delivery of any instruments, to effect the foregoing; provided,
however that IDT shall not be required to pay any amounts, waive any rights or
incur any Liabilities in connection therewith.

                                       13
<PAGE>

     (ii) Except as otherwise contemplated by any Ancillary Agreement, after the
date hereof, none of IDT or Net2Phone or any member of their respective Groups
shall, without the consent of the other, provide any such insurance carrier with
a release, or amend, modify or waive any rights under any such policy or
agreement, if such release, amendment, modification or waiver would adversely
affect any rights or potential rights of any member of the other Group
thereunder; provided however that the foregoing shall not (A) preclude any
member of any Group from presenting any claim or from exhausting any policy
limit, (B) require any member of any Group to pay any premium or other amount or
to incur any Liability, or (C) require any member of any Group to renew, extend
or continue any policy in force. Each of Net2Phone and IDT will share such
information as is reasonably necessary in order to permit the other to manage
and conduct its insurance matters in an orderly fashion.

     (c) This Agreement shall not be considered as an attempted assignment of
any policy of insurance or as a contract of insurance and shall not be construed
to waive any right or remedy of any member of the IDT Group in respect of any
Insurance Policy or any other contract or policy of insurance.

     (d) Net2Phone does hereby, for itself and each other member of the
Net2Phone Group, agree that no member of the IDT Group or any IDT Indemnitee
shall have any Liability whatsoever as a result of the insurance policies and
practices of IDT and its Affiliates as in effect at any time prior to the date
hereof, including as a result of the level or scope of any such insurance, the
creditworthiness of any insurance carrier, the terms and conditions of any
policy, the adequacy or timeliness of any notice to any insurance carrier with
respect to any claim or potential claim or otherwise.

     (e) Nothing in this Agreement shall be deemed to restrict any member of the
Net2Phone Group from acquiring at its own expense any other insurance policy in
respect of any Liabilities or covering any period.

     6.2.  CERTAIN BUSINESS MATTERS. (a) Except as may be expressly set forth in
Section 6.3 below or in any Ancillary Agreement, no member of any Group shall
have any duty to refrain from (i) engaging in the same or similar activities or
lines of business as any member of any other Group, (ii) doing business with any
potential or actual supplier or customer of any member of any other Group, or
(iii) engaging in, or refraining from, any other activities whatsoever relating
to any of the potential or actual suppliers or customers of any member of any
other Group.

     (b) Each of IDT and Net2Phone is aware that from time to time certain
business opportunities may arise which more than one Group may be financially
able to undertake, and which are, from their nature, in the line of more than
one Group's business and are of practical advantage to more than one Group. In
connection therewith, the parties agree that if, following the date hereof, any
of IDT or Net2Phone acquires knowledge of an opportunity that meets the
foregoing standard with respect to more than one Group, none of the IDT Group or
the Net2Phone Group shall have any duty to communicate or offer such opportunity
to any of the others and may pursue or acquire such opportunity for itself, or
direct such opportunity to any other Person.

                                       14
<PAGE>

     6.3.  NON-COMPETITION.

     (a) IDT acknowledges that as the Parent of Net2Phone it and its Affiliates
have become privy to certain confidential information and trade secrets of
Net2Phone and further acknowledges that it will derive substantial benefits from
the separation of IDT and Net2Phone and that purchasers of equity of Net2Phone
will be making substantial investments in reliance upon the agreement contained
in this Section 6.3 that the knowledge and expertise developed by Net2Phone and
available to IDT will be preserved and will not be used in competition with
Net2Phone. IDT hereby agrees that it is reasonable and necessary for the
protection of Net2Phone that it agree, and accordingly IDT hereby does agree
that, for a period of 36 months from the date hereof (the "Noncompetition
Period"), neither IDT nor any member of the IDT Group will directly or
indirectly, alone or in association with any other person, corporation, firm or
business, engage in the Net2Phone Business any where in the world or become a
stockholder, partner or owner of any other person, corporation, firm or business
that is primarily engaged in the Net2Phone Business any where in the world;
provided, however, that subject to Net2Phone's prior approval which shall not be
- -----------------
unreasonably withheld, IDT or a member of the IDT Group may acquire a passive
investment of up to 20% of another entity so long as IDT or such member of the
IDT Group does not assist that entity in developing an Internet telephony
business or otherwise engaging in the Net2Phone Business.

     (b) For a period of 36 months from the date hereof, neither IDT nor
Net2Phone, nor any member of either such party's affiliated group, shall,
whether for its own account or for the account of any other person, corporation,
firm or business (other than Net2Phone or its Affiliates), solicit or endeavor
to entice away from the other party, or otherwise interfere with the
relationship of such other party with, any person who or which is employed on
the date hereof by, or otherwise engaged to perform services for, the other
party (including, but not limited to, any independent contractors or
organizations), except to the extent that such other party agrees to release
such employee or other service provider to the other party or such other party's
affiliated group.  General advertising for employment positions or general
employment searches through a third party recruiter are not covered by this
Section 6.3(b).

     (c) IDT expressly agrees that the covenants contained in Section 6.3(a) and
Section 6.3(b) are reasonable and necessary for the protection of Net2Phone.
The provisions of such Section 6.3(a) and Section 6.3(b) are separate and
distinct commitments independent of each of the other provisions of such
Sections.  The invalidity or non-enforceability of this Section 6.3 in any
respect shall not affect the validity or enforceability of this Section 6.3 in
any other respect or of any other provisions of this Agreement. In the event
that any provision of this Section 6.3 shall be held invalid or unenforceable by
a court of competent jurisdiction by reason of the geographic or business scope
or the duration thereof, such invalidity or unenforceability shall attach only
to the scope or duration of such provision and shall not affect or render
invalid or unenforceable any other provision of this Agreement, and, to the
fullest extent permitted by law, this Agreement shall be construed as if the
geographic or business scope or the duration of such provision had been more
narrowly drafted so as not to be

                                       15
<PAGE>

invalid or unenforceable.

     (d) IDT acknowledges that Net2Phone would suffer irreparable harm if IDT
were to breach the provisions of this Section 6.3 and that Net2Phone's remedy at
law for any such breach is and will be insufficient and inadequate and that
Net2Phone shall be entitled to equitable relief, including by way of temporary
and permanent injunction, in addition to any remedies Net2Phone may have at law.

     6.4.  LATE PAYMENTS.  Except as expressly provided to the contrary in this
Agreement or in any Ancillary Agreement, any amount not paid when due pursuant
to this Agreement, any Ancillary Agreement or the Tax Agreement shall accrue
interest at a rate per annum equal to the Prime Rate plus 2% commencing upon the
later of the (a) due date of such amount and (b) thirtieth day following such
amount being invoiced or otherwise demanded in writing.


                                  ARTICLE VII
                    EXCHANGE OF INFORMATION; CONFIDENTIALITY

     7.1.  AGREEMENT FOR EXCHANGE OF INFORMATION; ARCHIVES. (a) Each of IDT and
Net2Phone, on behalf of its respective Group, agrees to provide, or cause to be
provided, to the other Group, as soon as reasonably practicable after written
request therefor, any Information in the possession or under the control of such
Group which the requesting party reasonably needs (i) to comply with reporting,
disclosure, filing or other requirements imposed on the requesting party
(including under applicable securities or tax laws) by a Governmental Authority
having jurisdiction over the requesting party, (ii) for use in any other
judicial, regulatory, administrative, tax or other proceeding or in order to
satisfy audit, accounting, claims, regulatory, litigation, tax or other similar
requirements, or (iii) to comply with its obligations under this Agreement or
any Ancillary Agreement; provided, however, that in the event that any party
determines that any such provision of Information could be commercially
detrimental, violate any law or agreement, or waive any attorney client
privilege, the parties shall take all reasonable measures to permit the
compliance with such obligations in a manner that avoids any such harm or
consequence.

     (b) Net2Phone shall have access during regular business hours (as in effect
from time to time) to the documents and objects of historic significance that
relate to the business of Net2Phone that are located in the IDT Records to the
extent such documents or objects have been specifically identified and requested
by Net2Phone in advance or, if specific documents or objects have not been
identified, to the extent Net2Phone has provided IDT with proper advance notice
to request such access and the Net2Phone representative designated to receive
such access is accompanied by an IDT representative.  Net2Phone may obtain
copies (but not originals) of documents for bona fide business purposes and may
obtain objects for exhibition purposes for commercially reasonable periods of
time if required for bona fide business purposes, provided that Net2Phone shall
cause any such objects to be returned promptly in the same condition in which
they were delivered to Net2Phone and Net2Phone shall comply with any rules,

                                       16
<PAGE>

procedures or other requirements, and shall be subject to any restrictions
(including prohibitions on removal of specified objects), that are then
applicable to IDT.  Nothing herein shall be deemed to restrict the access of any
member of the IDT Group to any such documents or objects or to impose any
liability on any member of the IDT Group if any such documents or objects are
not maintained or preserved by IDT.

     (c) After the date hereof, (i) Net2Phone shall maintain in effect at its
own cost and expense adequate systems and controls to the extent necessary to
enable the members of the IDT Group to satisfy their respective reporting,
accounting, audit and other obligations, and (ii) Net2Phone shall in a timely
manner provide, or cause to be provided, to IDT in such form as IDT shall
request, at no charge to IDT, all financial and other data and information as
IDT determines necessary or advisable in order to prepare IDT financial
statements and reports or filings with any Governmental Authority.

     7.2.  OWNERSHIP OF INFORMATION.  Any Information owned by one Group that is
provided to a requesting party pursuant to Section 7.1 shall be deemed to remain
the property of the providing party.  Unless specifically set forth herein,
nothing contained in this Agreement shall be construed as granting or conferring
rights of license or otherwise in any such Information.

     7.3.  COMPENSATION FOR PROVIDING INFORMATION.  The party requesting such
Information agrees to reimburse the other party for the reasonable costs, if
any, of creating, gathering and copying such Information, to the extent that
such costs are incurred for the benefit of the requesting party.  Except as may
be otherwise specifically provided elsewhere in this Agreement or in any other
agreement between the parties, such costs shall be computed in accordance with
the providing party's standard methodology and procedures.

     7.4.  RECORD RETENTION. To facilitate the possible exchange of Information
pursuant to this Article VII and other provisions of this Agreement after the
date hereof, the parties agree to use their reasonable best efforts to retain
all Information in their respective possession or control on the date hereof in
accordance with the policies of IDT as in effect on the date hereof.  No party
will destroy, or permit any of its Subsidiaries to destroy, any Information
which the other party may have the right to obtain pursuant to this Agreement
prior to the third anniversary of the date hereof without first using its
reasonable best efforts to notify the other party of the proposed destruction
and giving the other party the opportunity to take possession of such
information prior to such destruction; provided, however, that in the case of
any Information relating to Taxes or to Environmental Liabilities, such period
shall be extended to the expiration of the applicable statute of limitations
(giving effect to any extensions thereof).

     7.5.  LIMITATION OF LIABILITY.  No party shall have any liability to any
other party in the event that any Information exchanged or provided pursuant to
this Agreement which is an estimate or forecast, or which is based on an
estimate or forecast, is found to be inaccurate, in the absence of willful
misconduct by the party providing such Information.  No party shall have any
liability to any other party if any Information is destroyed after reasonable
best efforts by such party to comply with the provisions of

                                       17
<PAGE>


     7.6.  OTHER AGREEMENTS PROVIDING FOR EXCHANGE OF INFORMATION. The rights
and obligations granted under this Article VII are subject to any specific
limitations, qualifications or additional provisions on the sharing, exchange or
confidential treatment of Information set forth in any Ancillary Agreement.

     7.7.  PRODUCTION OF WITNESSES; RECORDS; COOPERATION. (a) After the date
hereof, except in the case of an adversarial Action by one party against another
party, each party hereto shall use its reasonable best efforts to make available
to each other party, upon written request, the former, current and future
directors, officers, employees, other personnel and agents of the members of its
respective Group as witnesses and any books, records or other documents within
its control or which it otherwise has the ability to make available, to the
extent that any such person (giving consideration to business demands of such
directors, officers, employees, other personnel and agents) or books, records or
other documents may reasonably be required in connection with any Action in
which the requesting party may from time to time be involved, regardless of
whether such Action is a matter with respect to which indemnification may be
sought hereunder. The requesting party shall bear all costs and expenses in
connection therewith.

     (b) If an Indemnifying Party chooses to defend or to seek to compromise or
settle any Third Party Claim, the other parties shall make available to such
Indemnifying Party or such other party, as the case may be, upon written
request, the former, current and future directors, officers, employees, other
personnel and agents of the members of its respective Group as witnesses and any
books, records or other documents within its control or which it otherwise has
the ability to make available, to the extent that any such person (giving
consideration to business demands of such directors, officers, employees, other
personnel and agents) or books, records or other documents may reasonably be
required in connection with such defense, settlement or compromise, or such
prosecution, evaluation or pursuit, as the case may be, and shall otherwise
cooperate in such defense, settlement or compromise, or such prosecution,
evaluation or pursuit, as the case may be.

     (c) Without limiting the foregoing, the parties shall cooperate and consult
to the extent reasonably necessary with respect to any Actions.

     (d) Without limiting any provision of this Section, each of the parties
agrees to cooperate, and to cause each member of its respective Group to
cooperate, with each other in the defense of any infringement or similar claim
with respect to any intellectual property and shall not claim to acknowledge, or
permit any member of its respective Group to claim to acknowledge, the validity
or infringing use of any intellectual property of a third Person in a manner
that would hamper or undermine the defense of such infringement or similar
claim.

     (e) The obligation of the parties to provide witnesses pursuant to this
Section 7.7 is intended to be interpreted in a manner so as to facilitate
cooperation and shall include the obligation to provide as witnesses inventors
and other officers without regard

                                       18
<PAGE>

to whether the witness or the employer of the witness could assert a possible
business conflict (subject to the exception set forth in the first sentence of
Section 7.7(a)).

     (f) In connection with any matter contemplated by this Section 7.7, the
parties will enter into a mutually acceptable joint defense agreement so as to
maintain to the extent practicable any applicable attorney-client privilege or
work product immunity of any member of any Group.

     7.8.  CONFIDENTIALITY.  (a) Subject to Section 7.9, each of IDT and
Net2Phone, on behalf of itself and each member of its respective Group, agrees
to hold, and to cause its respective directors, officers, employees, agents,
accountants, counsel and other advisors and representatives to hold, in strict
confidence, with at least the same degree of care that applies to IDT's
confidential and proprietary information pursuant to policies in effect as of
the date hereof, all Information concerning each such other Group that is either
in its possession (including Information in its possession prior to either of
the date hereof) or furnished by any such other Group or its respective
directors, officers, employees, agents, accountants, counsel and other advisors
and representatives at any time pursuant to this Agreement, any Ancillary
Agreement, the Tax Agreement or otherwise, and shall not use any such
Information other than for such purposes as shall be expressly permitted
hereunder or thereunder, except, in each case, to the extent that such
Information has been (i) in the public domain through no fault of such party or
any member of such Group or any of their respective directors, officers,
employees, agents, accountants, counsel and other advisors and representatives,
(ii) later lawfully acquired from other sources by such party (or any member of
such party's Group) which sources are not themselves bound by a confidentiality
obligation), or (iii) independently generated without reference to any
proprietary or confidential Information of the other party.

     (b) Each party agrees not to release or disclose, or permit to be released
or disclosed, any such Information to any other Person, except its directors,
officers, employees, agents, accountants, counsel and other advisors and
representatives who need to know such Information (who shall be advised of their
obligations hereunder with respect to such Information), except in compliance
with Section 7.9.  Without limiting the foregoing, when any Information is no
longer needed for the purposes contemplated by this Agreement, any Ancillary
Agreement, or the Tax Agreement, each party will promptly after request of the
other party either return to the other party all Information in a tangible form
(including all copies thereof and all notes, extracts or summaries based
thereon) or certify to the other party that it has destroyed such Information
(and such copies thereof and such notes, extracts or summaries based thereon).

     7.9.  PROTECTIVE ARRANGEMENTS.  In the event that any party or any member
of its Group either determines on the advice of its counsel that it is required
to disclose any Information pursuant to applicable law or receives any demand
under lawful process or from any Governmental Authority to disclose or provide
Information of any other party (or any member of any other party's Group) that
is subject to the confidentiality provisions hereof, such party shall notify the
other party prior to disclosing or providing such Information and shall
cooperate at the expense of the requesting party in seeking any reasonable
protective arrangements requested by such

                                       19
<PAGE>

other party. Subject to the foregoing, the Person that received such request may
thereafter disclose or provide Information to the extent required by such law
(as so advised by counsel) or by lawful process or such Governmental Authority.

                                  ARTICLE VIII
                        ARBITRATION; DISPUTE RESOLUTION

     8.1.  AGREEMENT TO ARBITRATE.  Except as otherwise specifically provided in
any Ancillary Agreement, the procedures for discussion, negotiation and
arbitration set forth in this Article VIII shall apply to all disputes,
controversies or claims (whether sounding in contract, tort or otherwise) that
may arise out of or relate to, or arise under or in connection with this
Agreement or any Ancillary Agreement, or the transactions contemplated hereby or
thereby (including all actions taken in furtherance of the transactions
contemplated hereby or thereby on or prior to the date hereof), or the
commercial or economic relationship of the parties relating hereto or thereto,
between or among any member of the IDT Group and the Net2Phone Group.  Each
party agrees on behalf of itself and each member of its respective Group that
the procedures set forth in this Article VIII shall be the sole and exclusive
remedy in connection with any dispute, controversy or claim relating to any of
the foregoing matters and irrevocably waives any right to commence any Action in
or before any Governmental Authority, except as expressly provided in Sections
8.7(b) and 8.8 and except to the extent provided under the Arbitration Act in
the case of judicial review of arbitration results or awards.  Each party on
behalf of itself and each member of its respective Group irrevocably waives any
right to any trial by jury with respect to any claim, controversy or dispute set
forth in the first sentence of this Section 8.1.

     8.2.  ESCALATION.  (a) It is the intent of the parties to use their
respective reasonable best efforts to resolve expeditiously any dispute,
controversy or claim between or among them with respect to the matters covered
hereby that may arise from time to time on a mutually acceptable negotiated
basis. In furtherance of the foregoing, any party involved in a dispute,
controversy or claim shall deliver a notice (an "Escalation Notice") demanding
an in-person meeting involving representatives of the parties at a senior level
of management of the parties (or if the parties agree, of the appropriate
strategic business unit or division within such entity). A copy of any such
Escalation Notice shall be given to the Chief Financial Officer, or like officer
or official, of each party involved in the dispute, controversy or claim (which
copy shall state that it is an Escalation Notice pursuant to this Agreement).
Any agenda, location or procedure for such discussions or negotiations between
the parties may be established by the parties from time to time; provided,
however, that the parties shall use their reasonable best efforts to meet within
30 days of the Escalation Notice.

     (b) The parties may, by mutual consent, retain a mediator to aid the
parties in their discussions and negotiations by informally providing advice to
the parties.  Any opinion expressed by the mediator shall be strictly advisory
and shall not be binding on the parties, nor shall any opinion expressed by the
mediator be admissible in any arbitration proceedings. The mediator may be
chosen from a list of mediators previously selected by the parties or by other
agreement of the parties.  Costs of the mediation shall

                                       20
<PAGE>

be borne equally by the parties involved in the matter, except that each party
shall be responsible for its own expenses. Mediation is not a prerequisite to a
demand for arbitration under Section 8.3.

     8.3.  DEMAND FOR ARBITRATION.  (a) At any time after the first to occur of
(i) the date of the meeting actually held pursuant to the applicable Escalation
Notice or (ii) 45 days after the delivery of an Escalation Notice (as
applicable, the "Arbitration Demand Date"), any party involved in the dispute,
controversy or claim (regardless of whether such party delivered the Escalation
Notice) may, unless the Applicable Deadline has occurred, make a written demand
(the "Arbitration Demand Notice") that the dispute be resolved by binding
arbitration, which Arbitration Demand Notice shall be given to the parties to
the dispute, controversy or claim in the manner set forth in Section 10.5. In
the event that any party shall deliver an Arbitration Demand Notice to another
party, such other party may itself deliver an Arbitration Demand Notice to such
first party with respect to any related dispute, controversy or claim with
respect to which the Applicable Deadline has not passed without the requirement
of delivering an Escalation Notice. No party may assert that the failure to
resolve any matter during any discussions or negotiations, the course of conduct
during the discussions or negotiations or the failure to agree on a mutually
acceptable time, agenda, location or procedures for the meeting, in each case,
as contemplated by Section 8.2, is a prerequisite to a demand for arbitration
under Section 8.3.

     (b) Except as may be expressly provided in any Ancillary Agreement, any
Arbitration Demand Notice may be given until one year and 45 days after the
later of the occurrence of the act or event giving rise to the underlying claim
or the date on which such act or event was, or should have been, in the exercise
of reasonable due diligence, discovered by the party asserting the claim (as
applicable and as it may in a particular case be specifically extended by the
parties in writing, the "Applicable Deadline"). Any discussions, negotiations or
mediations between the parties pursuant to this Agreement or otherwise will not
toll the Applicable Deadline unless expressly agreed in writing by the parties.
Each of the parties agrees on behalf of itself and each member of its Group that
if an Arbitration Demand Notice with respect to a dispute, controversy or claim
is not given prior to the expiration of the Applicable Deadline, as between or
among the parties and the members of their Groups, such dispute, controversy or
claim will be barred. Subject to Sections 8.7(b) and 8.8, upon delivery of an
Arbitration Demand Notice pursuant to Section 8.3(a) prior to the Applicable
Deadline, the dispute, controversy or claim shall be decided by a sole
arbitrator in accordance with the rules set forth in this Article VIII.

     8.4.  ARBITRATORS.  (a) Within 15 days after a valid Arbitration Demand
Notice is given, the parties involved in the dispute, controversy or claim
referenced therein shall attempt to select a sole arbitrator satisfactory to all
such parties.

     (b) In the event that such parties are not able jointly to select a sole
arbitrator within such 15-day period, such parties shall each appoint an
arbitrator within 30 days after delivery of the Arbitration Demand Notice. If
one party appoints an arbitrator within such time period and the other party or
parties fail to appoint an arbitrator within such time period, the arbitrator
appointed by the one party shall be the sole arbitrator of the

                                       21
<PAGE>

matter.

     (c) In the event that a sole arbitrator is not selected pursuant to
paragraph (a) or (b) above and, instead, two or more arbitrators are selected
pursuant to paragraph (b) above, the two or more arbitrators will, within 30
days after the appointment of the later of them to be appointed, select an
additional arbitrator who shall act as the sole arbitrator of the dispute. After
selection of such sole arbitrator, the initial arbitrators shall have no further
role with respect to the dispute. In the event that the arbitrators so appointed
do not, within 30 days after the appointment of the later of them to be
appointed, agree on the selection of the sole arbitrator, any party involved in
such dispute may apply to CPR, New York, New York to select the sole arbitrator,
which selection shall be made by such organization within 30 days after such
application. Any arbitrator selected pursuant to this paragraph (c) shall be
disinterested with respect to any of the parties and the matter and shall be
reasonably competent in the applicable subject matter.

     (d) The sole arbitrator selected pursuant to paragraph (a), (b) or (c)
above will set a time for the hearing of the matter which will commence no later
than 90 days after the date of appointment of the sole arbitrator pursuant to
paragraph (a), (b) or (c) above and which hearing will be no longer than 30 days
(unless in the judgment of the arbitrator the matter is unusually complex and
sophisticated and thereby requires a longer time, in which event such hearing
shall be no longer than 90 days). The final decision of such arbitrator will be
rendered in writing to the parties not later than 60 days after the last hearing
date, unless otherwise agreed by the parties in writing.

     (e) The place of any arbitration hereunder will be New York, New York,
unless otherwise agreed by the parties.

     8.5.  HEARINGS.  Within the time period specified in Section 8.4(d), the
matter shall be presented to the arbitrator at a hearing by means of written
submissions of memoranda and verified witness statements, filed simultaneously,
and responses, if necessary in the judgment of the arbitrator or both the
parties. If the arbitrator deems it to be essential to a fair resolution of the
dispute, live cross-examination or direct examination may be permitted, but is
not generally contemplated to be necessary. The arbitrator shall actively manage
the arbitration with a view to achieving a just, speedy and cost-effective
resolution of the dispute, claim or controversy. The arbitrator may, in his or
her discretion, set time and other limits on the presentation of each party's
case, its memoranda or other submissions, and refuse to receive any proffered
evidence, which the arbitrator, in his or her discretion, finds to be
cumulative, unnecessary, irrelevant or of low probative nature. Except as
otherwise set forth herein, any arbitration hereunder will be conducted in
accordance with the CPR Rules for Non-Administered Arbitration of Business
Disputes then prevailing (except that the arbitration will not be conducted
under the auspices of the CPR and the fee schedule of the CPR will not apply).
Except as expressly set forth in Section 8.8(b), the decision of the arbitrator
will be final and binding on the parties, and judgment thereon may be had and
will be enforceable in any court having jurisdiction over the parties.
Arbitration awards will bear interest at an annual rate of the Prime Rate plus
2% per annum. To the extent that the provisions of this Agreement and the
prevailing rules of the CPR conflict, the provisions of this Agreement

                                       22
<PAGE>

shall govern.

     8.6.  DISCOVERY AND CERTAIN OTHER MATTERS.  (a) Any party involved in the
applicable dispute may request limited document production from the other party
or parties of specific and expressly relevant documents, with the reasonable
expenses of the producing party incurred in such production paid by the
requesting party. Any such discovery (which rights to documents shall be
substantially less than document discovery rights prevailing under the Federal
Rules of Civil Procedure) shall be conducted expeditiously and shall not cause
the hearing provided for in Section 8.5 to be adjourned except upon consent of
all parties involved in the applicable dispute or upon an extraordinary showing
of cause demonstrating that such adjournment is necessary to permit discovery
essential to a party to the proceeding. Depositions, interrogatories or other
forms of discovery (other than the document production set forth above) shall
not occur except by consent of the parties involved in the applicable dispute.
Disputes concerning the scope of document production and enforcement of the
document production requests will be determined by written agreement of the
parties involved in the applicable dispute or, failing such agreement, will be
referred to the arbitrator for resolution. All discovery requests will be
subject to the proprietary rights and rights of privilege of the parties, and
the arbitrator will adopt procedures to protect such rights and to maintain the
confidential treatment of the arbitration proceedings (except as may be required
by law). Subject to the foregoing, the arbitrator shall have the power to issue
subpoenas to compel the production of documents relevant to the dispute,
controversy or claim.

     (b) The arbitrator shall have full power and authority to determine issues
of arbitrability but shall otherwise be limited to interpreting or construing
the applicable provisions of this Agreement or any Ancillary Agreement, and will
have no authority or power to limit, expand, alter, amend, modify, revoke or
suspend any condition or provision of this Agreement or any Ancillary Agreement;
it being understood, however, that the arbitrator will have full authority to
implement the provisions of this Agreement or any Ancillary Agreement, and to
fashion appropriate remedies for breaches of this Agreement (including interim
or permanent injunctive relief); provided that the arbitrator shall not have (i)
any authority in excess of the authority a court having jurisdiction over the
parties and the controversy or dispute would have absent these arbitration
provisions or (ii) any right or power to award punitive or treble damages. It is
the intention of the parties that in rendering a decision the arbitrator give
effect to the applicable provisions of this Agreement and the Ancillary
Agreements and follow applicable law (it being understood and agreed that this
sentence shall not give rise to a right of judicial review of the arbitrator's
award).

     (c) If a party fails or refuses to appear at and participate in an
arbitration hearing after due notice, the arbitrator may hear and determine the
controversy upon evidence produced by the appearing party.

     (d) Arbitration costs will be borne equally by each party involved in the
matter, except that each party will be responsible for its own attorney's fees
and other costs and expenses, including the costs of witnesses selected by such
party.

                                       23
<PAGE>

     8.7.  CERTAIN ADDITIONAL MATTERS.  (a) Any arbitration award shall be a
bare award limited to a holding for or against a party and shall be without
findings as to facts, issues or conclusions of law (including with respect to
any matters relating to the validity or infringement of patents or patent
applications) and shall be without a statement of the reasoning on which the
award rests, but must be in adequate form so that a judgment of a court may be
entered thereupon. Judgment upon any arbitration award hereunder may be entered
in any court having jurisdiction thereof.

     (b) Prior to the time at which an arbitrator is appointed pursuant to
Section 8.4, any party may seek one or more temporary restraining orders or
preliminary injunctions in a court of competent jurisdiction if necessary in
order to preserve and protect the status quo. Neither the request for, or grant
or denial of, any such temporary restraining order or preliminary injunction
shall be deemed a waiver of the obligation to arbitrate as set forth herein and
the arbitrator may dissolve, continue or modify any such order. Any such
temporary restraining order or preliminary injunction shall remain in effect
until the first to occur of the expiration of the order in accordance with its
terms or the dissolution thereof by the arbitrator.

     (c) Except as required by law, the parties shall hold, and shall cause
their respective officers, directors, employees, agents and other
representatives to hold, the existence, content and result of mediation or
arbitration in confidence in accordance with the provisions of Article VIII and
except as may be required in order to enforce any award. Each of the parties
shall request that any mediator or arbitrator comply with such confidentiality
requirement.

     (d) In the event that at any time the sole arbitrator shall fail to serve
as an arbitrator for any reason, the parties shall select a new arbitrator who
shall be disinterested as to the parties and the matter in accordance with the
procedures set forth herein for the selection of the initial arbitrator. The
extent, if any, to which testimony previously given shall be repeated or as to
which the replacement arbitrator elects to rely on the stenographic record (if
there is one) of such testimony shall be determined by the replacement
arbitrator.

     8.8.  LIMITED COURT ACTIONS.  (a) Notwithstanding anything herein to the
contrary, in the event that any party reasonably determines the amount in
controversy in any dispute, controversy or claim (or any series of related
disputes, controversies or claims) under this Agreement or any Ancillary
Agreement is, or is reasonably likely to be, in excess of $5 million and if such
party desires to commence an Action in lieu of complying with the arbitration
provisions of this Article, such party shall so state in its Arbitration Demand
Notice. If the other parties to the arbitration do not agree that the amount in
controversy in such dispute, controversy or claim (or such series of related
disputes, controversies or claims) is, or is reasonably likely to be, in excess
of $5 million, the arbitrator selected pursuant to Section 8.4 hereof shall
decide whether the amount in controversy in such dispute, controversy or claim
(or such series of related disputes, controversies or claims) is, or is
reasonably likely to be, in excess of $5 million. The arbitrator shall set a
date that is no later than ten days after the date of his or her appointment for
submissions by the parties with respect to such issue. There shall not be

                                       24
<PAGE>

any discovery in connection with such issue. The arbitrator shall render his or
her decision on such issue within five days of such date so set by the
arbitrator. In the event that the arbitrator determines that the amount in
controversy in such dispute, controversy or claim (or such series of related
disputes, controversies or claims) is or is reasonably likely to be in excess of
$5 million, the provisions of Sections 8.4(d) and (e), 8.5, 8.6, 8.7 and 8.10
hereof shall not apply and on or before (but, except as expressly set forth in
Section 8.8(b), not after) the tenth business day after the date of such
decision, any party to the arbitration may elect, in lieu of arbitration, to
commence an Action with respect to such dispute, controversy or claim (or such
series of related disputes, controversies or claims) in any court of competent
jurisdiction. If the arbitrator does not so determine, the provisions of this
Article (including with respect to time periods) shall apply as if no
determinations were sought or made pursuant to this Section 8.8(a).

     (b) In the event that an arbitration award in excess of $5 million is
issued in any arbitration proceeding commenced hereunder, any party may, within
60 days after the date of such award, submit the dispute, controversy or claim
(or series of related disputes, controversies or claims) giving rise thereto to
a court of competent jurisdiction, regardless of whether such party or any other
party sought to commence an Action in lieu of proceeding with arbitration in
accordance with Section 8.8(a). In such event, the applicable court may elect to
rely on the record developed in the arbitration or, if it determines that it
would be advisable in connection with the matter, allow the parties to seek
additional discovery or to present additional evidence. Each party shall be
entitled to present arguments to the court with respect to whether any such
additional discovery or evidence shall be permitted and with respect to all
other matters relating to the applicable dispute, controversy or claim (or
series of related disputes, controversies or claims).

     8.9.  CONTINUITY OF SERVICE AND PERFORMANCE.  Unless otherwise agreed in
writing, the parties will continue to provide service and honor all other
commitments under this Agreement and each Ancillary Agreement during the course
of dispute resolution pursuant to the provisions of this Article VIII with
respect to all matters not subject to such dispute, controversy or claim.

     8.10. LAW GOVERNING ARBITRATION PROCEDURES.  The interpretation of the
provisions of this Article VIII, only insofar as they relate to the agreement to
arbitrate and any procedures pursuant thereto, shall be governed by the
Arbitration Act and other applicable federal law. In all other respects, the
interpretation of this Agreement shall be governed as set forth in Section 10.2.


                                   ARTICLE IX
                  FURTHER ASSURANCES AND ADDITIONAL COVENANTS

     9.1.  FURTHER ASSURANCES. (a) In addition to the actions specifically
provided for elsewhere in this Agreement, each of the parties hereto shall use
its reasonable best effort to take, or cause to be taken, all actions, and to
do, or cause to be done, all things reasonably necessary, proper or advisable
under applicable laws, regulations and agreements to consummate and make
effective the transactions

                                       25
<PAGE>

contemplated by this Agreement, the Ancillary Agreements and the Tax Agreement.

     (b) Without limiting the foregoing, each party hereto shall cooperate with
the other parties, and without any further consideration, but at the expense of
the requesting party, to execute and deliver, or use its reasonable best efforts
to cause to be executed and delivered, all instruments, including instruments of
conveyance, assignment and transfer, and to make all filings with, and to obtain
all consents, approvals or authorizations of, any Governmental Authority or any
other Person under any permit, license, agreement, indenture or other instrument
and to take all such other actions as such party may reasonably be requested to
take by any other party hereto from time to time, consistent with the terms of
this Agreement and the Ancillary Agreements, in order to effectuate the
provisions and purposes of this Agreement and the Ancillary Agreements and the
other transactions contemplated hereby and thereby. Without limiting the
foregoing, to the extent necessary to effectuate the provisions and purposes of
this Agreement and the Ancillary Agreements and the other transactions
contemplated hereby and thereby each party will, at the reasonable request, cost
and expense of any other party, take such other actions as may be reasonably
necessary to vest in such other party good and marketable title, free and clear
of any Security Interest, if and to the extent it is practicable to do so.

     (c) IDT and Net2Phone, and each of the members of their respective Groups,
waive (and agree not to assert against any of the others) any claim or demand
that any of them may have against any of the others for any Liabilities or other
claims relating to or arising out of: (i) the failure of Net2Phone or any member
of the Net2Phone Group, on the one hand, or of IDT or any member of the IDT
Group, on the other hand, to provide any notification or disclosure required
under any state Environmental Law in connection with the transactions
contemplated by this Agreement, or (ii) any inadequate, incorrect or incomplete
notification or disclosure under any such state Environmental Law by the
applicable transferor.

     (d) Following the date hereof, if one or more of the parties identifies any
commercial or other service that is needed to assure a smooth and orderly
transition of the businesses in connection with the consummation of the
transactions contemplated hereby, and that is not otherwise governed by the
provisions of this Agreement or any Ancillary Agreement, the parties will
cooperate in determining whether there is a mutually acceptable arm's-length
basis on which one or more of the other parties will provide such service.



                                   ARTICLE X
                                 MISCELLANEOUS

     10.1.  COUNTERPARTS; ENTIRE AGREEMENT; CORPORATE POWER.
     (a)    This Agreement may be executed in one or more counterparts, all of
which shall be considered one and the same agreement, and shall become effective
when one or more counterparts have been signed by each of the parties and
delivered to the other party.

                                       26
<PAGE>

     (b) This Agreement, and the Exhibits, Schedules and Appendices hereto,
contain the entire agreement between the parties with respect to the subject
matter hereof, supersede all previous agreements, negotiations, discussions,
writings, understandings, commitments and conversations with respect to such
subject matter and there are no agreements or understandings between the parties
other than those set forth or referred to herein or therein.

     (c) IDT represents on behalf of itself and each other member of the IDT
Group and Net2Phone represents on behalf of itself and each other member of the
Net2Phone Group as follows:

       (i) each such Person has the requisite corporate or other power and
authority and has taken all corporate or other action necessary in order to
execute, deliver and perform each of this Agreement, each of the Ancillary
Agreements and the Tax Agreement to which it is a party and to consummate the
transactions contemplated hereby and thereby; and

       (ii) this Agreement, each Ancillary Agreement and the Tax Agreement to
which it is a party has been duly executed and delivered by it and constitutes a
valid and binding agreement of it enforceable in accordance with the terms
thereof subject to (a) the laws of bankruptcy and laws effecting creditors'
rights generally and (b) the availability of equitable remedies.

     10.2.  GOVERNING LAW.  Except as set forth in Section 8.10, this Agreement
shall be governed by and construed and interpreted in accordance with the laws
of the State of New York (other than as to its laws of arbitration which shall
be governed under the Arbitration Act or other applicable federal law pursuant
to Section 8.10), irrespective of the choice of laws principles of the State of
New York, as to all matters, including matters of validity, construction,
effect, enforceability, performance and remedies.

     10.3.  ASSIGNABILITY.  Except as set forth in any Ancillary Agreement or
the Tax Agreement, this Agreement (including without limitation the provisions
of Section 6.3 hereof), each Ancillary Agreement and the Tax Agreement shall be
binding upon and inure to the benefit of the parties hereto and thereto,
respectively, and their respective successors and assigns (whether by merger,
operation of law or otherwise); provided, however, that no party hereto or
thereto may assign its respective rights or delegate its respective obligations
under this Agreement, any Ancillary Agreement or the Tax Agreement without the
express prior written consent of the other parties hereto or thereto.

     10.4.  THIRD PARTY BENEFICIARIES.  Except for the indemnification rights
under this Agreement of any IDT Indemnitee or Net2Phone Indemnitee in their
respective capacities as such, (a) the provisions of this Agreement, each
Ancillary Agreement and the Tax Agreement are solely for the benefit of the
parties and are not intended to confer upon any Person except the parties any
rights or remedies hereunder, and (b) there are no third party beneficiaries of
this Agreement, any Ancillary Agreement or the Tax Agreement and none of this
Agreement, any Ancillary Agreement or the Tax Agreement shall provide any third
person with any remedy, claim, liability,

                                       27
<PAGE>

reimbursement, claim of action or other right in excess of those existing
without reference to this Agreement, any Ancillary Agreement or the Tax
Agreement. No party hereto shall have any right, remedy or claim with respect to
any provision of this Agreement, any Ancillary Agreement or the Tax Agreement to
the extent such provision relates solely to the other two parties hereto or the
members of such other two parties' respective Groups.

     10.5.  NOTICES.  All notices requests, demands, waivers and other
communications under this Agreement, any Ancillary Agreement or the Tax
Agreement shall be in writing and shall be deemed to have been duly given if
delivered personally or by facsimile transmission or mailed (certified or
registered mail, postage prepaid, return receipt requested):

         If to IDT, to:    IDT Corporation
                           190 Main Street
                           Hackensack, New Jersey  07601
                           Attention:  Chief Financial Officer
                           Fax No.:  (201) 907-5165

         If to Net2Phone:  Net2Phone, Inc.
                           171 Main Street
                           Hackensack, New Jersey  07601
                           Attention:  Chief Financial Officer
                           Fax No.:  (201) 907-5351

or to such other person or address as any party shall specify by notice in
writing to the other party.  All such notices, requests, demands, waivers and
communications shall be deemed to have been received on the date on which hand
delivered, upon transmission of the facsimile transmission by the sender and
issuance by the transmitting machine of a confirmation slip confirming that the
number of pages constituting the notice have been transmitted without error, or
on the third business day following the date on which so mailed, except for a
notice of change of address, which shall be effective only upon receipt thereof.
In the case of a notice sent by facsimile transmission, the sender shall
contemporaneously mail a copy of the notice to the addressee at the address
provided for above.  However, such mailing shall in no way alter the time at
which the facsimile notice is deemed received.  In no event shall the provision
of notice pursuant to this Section 10.5 constitute notice for service of
process.

     10.6.  SEVERABILITY.  If any provision of this Agreement, any Ancillary
Agreement or the Tax Agreement or the application thereof to any Person or
circumstance is determined by a court of competent jurisdiction to be invalid,
void or unenforceable, the remaining provisions hereof or thereof, or the
application of such provision to Persons or circumstances or in jurisdictions
other than those as to which it has been held invalid or unenforceable, shall
remain in full force and effect and shall in no way be affected, impaired or
invalidated thereby, so long as the economic or legal substance of the
transactions contemplated hereby or thereby, as the case may be, is not affected
in any manner adverse to any party. Upon such determination, the parties shall

                                       28
<PAGE>

negotiate in good faith in an effort to agree upon such a suitable and equitable
provision to effect the original intent of the parties.

     10.7.  FORCE MAJEURE.  No party shall be deemed in default of this
Agreement, any Ancillary Agreement or the Tax Agreement to the extent that any
delay or failure in the performance of its obligations under this Agreement, any
Ancillary Agreement or the Tax Agreement results from any cause beyond its
reasonable control and without its fault or negligence, such as acts of God,
acts of civil or military authority, embargoes, epidemics, war, riots,
insurrections, fires, explosions, earthquakes, floods, unusually severe weather
conditions, labor problems or unavailability of parts, or, in the case of
computer systems, any failure in electrical or air conditioning equipment. In
the event of any such excused delay, the time for performance shall be extended
for a period equal to the time lost by reason of the delay.

     10.8.  PUBLICITY.  Each of Net2Phone and IDT shall consult with each other
prior to issuing any press releases or otherwise making public statements with
respect to the other transactions contemplated hereby and prior to making any
filings with any Governmental Authority with respect thereto.

     10.9.  HEADINGS.  The article, section and paragraph headings contained in
this Agreement and in the Ancillary Agreements and the Tax Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement, any Ancillary Agreement or the Tax Agreement.

     10.10.  SURVIVAL OF COVENANTS.  Except as expressly set forth in any
Ancillary Agreement and the Tax Agreement, the covenants, representations and
warranties contained in this Agreement, each Ancillary Agreement and the Tax
Agreement, and liability for the breach of any obligations contained herein,
shall survive the delivery hereof.

     10.11.  WAIVERS OF DEFAULT.  Waiver by any party of any default by the
other party of any provision of this Agreement, any Ancillary Agreement or the
Tax Agreement shall not be deemed a waiver by the waiving party of any
subsequent or other default, nor shall it prejudice the rights of the other
party.

     10.12.  SPECIFIC PERFORMANCE.  In the event of any actual or threatened
default in, or breach of, any of the terms, conditions and provisions of this
Agreement, any Ancillary Agreement or the Tax Agreement, the party or parties
who are or are to be thereby aggrieved shall have the right to specific
performance and injunctive or other equitable relief of its rights under this
Agreement, such Ancillary Agreement or the Tax Agreement, in addition to any and
all other rights and remedies at law or in equity, and all such rights and
remedies shall be cumulative. The parties agree that the remedies at law for any
breach or threatened breach, including monetary damages, are inadequate
compensation for any loss and that any defense in any action for specific
performance that a remedy at law would be adequate is waived. Any requirements
for the securing or posting of any bond with such remedy are waived.

                                       29
<PAGE>

     10.13.  AMENDMENTS.  No provisions of this Agreement, any Ancillary
Agreement or the Tax Agreement shall be deemed waived, amended, supplemented or
modified by any party, unless such waiver, amendment, supplement or modification
is in writing and signed by the authorized representative of the party against
whom it is sought to enforce such waiver, amendment, supplement or modification.

     10.14.  INTERPRETATION.  Words in the singular shall be held to include the
plural and vice versa and words of one gender shall be held to include the other
genders as the context requires. The terms "hereof," "herein," and "herewith"
and words of similar import shall, unless otherwise stated, be construed to
refer to this Agreement (or the applicable Ancillary Agreement or the Tax
Agreement) as a whole (including all of the Schedules, Exhibits and Appendices
hereto and thereto) and not to any particular provision of this Agreement (or
such Ancillary Agreement or the Tax Agreement). Article, Section, Exhibit,
Schedule and Appendix references are to the Articles, Sections, Exhibits,
Schedules and Appendices to this Agreement (or the applicable Ancillary
Agreement or the Tax Agreement) unless otherwise specified. The word "including"
and words of similar import when used in this Agreement (or the applicable
Ancillary Agreement or the Tax Agreement) shall mean "including, without
limitation," unless the context otherwise requires or unless otherwise
specified.

                                       30
<PAGE>

     IN WITNESS WHEREOF, the parties have caused this Separation Agreement to be
executed by their duly authorized representatives as of the date first above
written.

                              IDT CORPORATION

                              By: /s/ Hal Brecher
                                 --------------------------------
                              Name:  Hal Brecher
                              Title:  Chief Operating Officer


                              NET2PHONE, INC.

                              By: /s/ Howard Balter
                                 --------------------------------
                              Name: Howard Balter
                              Title: Chief Executive Officer

                                       31
<PAGE>


                                   EXHIBIT A
                                   ---------

     The provision of and developmental efforts related to Internet telephony
services and voice enabling Web applications.

<PAGE>

                                                                   EXHIBIT 10.15


                                NET2PHONE, INC.
           1999 AMENDED AND RESTATED STOCK OPTION AND INCENTIVE PLAN

1.  Purpose; Types of Awards; Construction.
- --  --------------------------------------

          The purpose of the Amended and Restated Net2Phone, Inc. 1999 Stock
Option and Incentive Plan (the "Plan") is to provide incentives to executive
officers, other key employees, directors and consultants of Net2Phone, Inc. (the
"Company"), or any parent or subsidiary of the Company which now exists or
hereafter is organized or acquired by the Company, to acquire a proprietary
interest in the Company, to continue as officers, employees, directors or
consultants, to increase their efforts on behalf of the Company and to promote
the success of the Company's business.  The provisions of the Plan are intended
to satisfy the requirements of Section 16(b) of the Securities Exchange Act of
1934, as amended, and of Section 162(m) of the Internal Revenue Code of 1986, as
amended, and shall be interpreted in a manner consistent with the requirements
thereof.

2.  Definitions.
- --  -----------
          As used in this Plan, the following words and phrases shall have the
meanings indicated:

        (a)  "Agreement" shall mean a written agreement entered into between the
Company and a Grantee in connection with an award under the Plan.

        (b)  "Board" shall mean the Board of Directors of the Company.

        (c)  "Change in Control" means a change in ownership or control of the
Company effected through either of the following:

                  (i)  any "person," as such term is used in Sections 13(d) and
     14(d) of the Exchange Act (other than (A) the Company, (B) any trustee or
     other fiduciary holding securities under an employee benefit plan of the
     Company, (C) any corporation or other entity owned, directly or indirectly,
     by the stockholders of the Company in substantially the same proportions as
     their ownership of Common Stock, or (D) any person who, immediately prior
     to the Initial Public Offering, owned more than 25% of the combined voting
     power of the Company's then outstanding voting securities), is or becomes
     the "beneficial owner" (as defined in Rule 13d-3 under the Exchange Act),
     directly or indirectly, of securities of the Company representing 25% or
     more of the combined voting power of the Company's then outstanding voting
     securities; or

                (ii)   during any period of not more than two consecutive years,
     not including any period prior to the initial adoption of this Plan by the
     Board, individuals who at the beginning of such period constitute the
     Board, and any new director (other than a director whose initial assumption
     of office is in connection with an actual or threatened election contest,
     including, but not limited to a consent solicitation, relating to the
     election of directors of the Company) whose election by the Board or
     nomination for election by the Company's stockholders was approved by a
     vote of at least two-thirds (2/3) of the directors then still in office who
     either were directors at the beginning of the period or whose election or
     nomination for election was previously so approved, cease for any reason to
     constitute at least a majority thereof.
<PAGE>

        (d)  "Code" shall mean the Internal Revenue Code of 1986, as amended
from time to time.

        (e)  "Committee" shall mean the Compensation Committee of the Board or
such other committee as the Board may designate from time to time to administer
the Plan.

        (f)  "Common Stock" shall mean shares of common stock, par value $.01
per share, of the Company.

        (g)  "Company" shall mean Net2Phone Inc., a corporation organized under
the laws of the State of Delaware, or any successor corporation.

        (h)  "Continuous Service" means that the provision of services to the
Company or a Related Entity in any capacity of officer, employee, director or
consultant is not interrupted or terminated. Continuous Service shall not be
considered interrupted in the case of (i) any approved leave of absence, (ii)
transfers between locations of the Company or among the Company, any Related
Entity or any successor in any capacity of officer, employee, director or
consultant, or (iii) any change in status as long as the individual remains in
the service of the Company or a Related Entity in any capacity of officer,
employee, director or consultant (except as otherwise provided in the applicable
Agreement). An approved leave of absence shall include sick leave, maternity
leave, military leave or any other authorized personal leave. For purposes of
Incentive Stock Options, no such leave may exceed ninety (90) days unless
reemployment upon expiration of such leave is guaranteed by statute or contract.

        (i)  "Corporate Transaction" means any of the following transactions:

                (i) a merger or consolidation of the Company with any other
     corporation or other entity, other than (A) a merger or consolidation which
     would result in the voting securities of the Company outstanding
     immediately prior thereto continuing to represent (either by remaining
     outstanding or by being converted into voting securities of the surviving
     or parent entity) 80% or more of the combined voting power of the voting
     securities of the Company or such surviving or parent entity outstanding
     immediately after such merger or consolidation or (B) a merger or
     consolidation effected to implement a recapitalization of the Company (or
     similar transaction) in which no "person" (as defined in the Exchange Act)
     acquired 25% or more of the combined voting power of the Company's then
     outstanding securities; or

                (ii) a plan of complete liquidation of the Company or an
     agreement for the sale or disposition by the Company of all or
     substantially all of its assets (or any transaction having a similar
     effect).

        (j)  "Disability" shall mean a Grantee's inability to perform his or her
duties with the Company or any of its affiliates by reason of any medically
determinable physical or mental impairment, as determined by a physician
selected by the Grantee and acceptable to the Company.

                                       2
<PAGE>

        (k)  "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended from time to time.

        (l)  "Fair Market Value" per share as of a particular date shall mean
(i) the closing sale price per share of Common Stock on the national securities
exchange on which the Common Stock is principally traded for such date or the
last preceding date on which there was a sale of such Common Stock on such
exchange, as the Committee shall determine, or (ii) if the shares of Common
Stock are then traded in an over-the-counter market, the average of the closing
bid and asked prices for the shares of Common Stock in such over-the-counter
market for the last preceding date on which there was a sale of such Common
Stock in such market, or (iii) if the shares of Common Stock are not then listed
on a national securities exchange or traded in an over-the-counter market, such
value as the Committee, in its sole discretion, shall determine; provided,
however, that the Fair Market Value per share on the date of the Initial Public
Offering will equal the Initial Public Offering price per share or such other
price that the Committee determines in its sole discretion.

        (m)  "Grantee" shall mean a person who receives a grant of Options,
Stock Appreciation Rights, Limited Rights or Restricted Stock under the Plan.

        (n)  "IDT" shall mean IDT Corporation, a Delaware corporation, and any
successor corporation thereto.

        (o)  "Incentive Stock Option" shall mean any option intended to be, and
designated as, an incentive stock option within the meaning of Section 422 of
the Code.

        (p)  "Initial Public Offering" shall mean the underwritten initial
public offering of shares of Common Stock.

        (q)  "Insider" shall mean a Grantee who is subject to the reporting
requirements of Section 16(a) of the Exchange Act.

        (r)  "Limited Right" shall mean a limited stock appreciation right
granted pursuant to Section 10.

        (s)  "Non-Employee Director" means a member of the Board who is not an
employee of the Company or any Related Entity.

        (t)  "Nonqualified Stock Option" shall mean any option not designated as
an Incentive Stock Option.

        (u)  "Option" or "Options" shall mean a grant to a Grantee of an option
or options to purchase shares of Common Stock.

        (v)  "Option Agreement" shall have the meaning set forth in Section 6.

        (w)  "Option Price" shall mean the exercise price of the shares of
Common Stock covered by an Option.

                                       3
<PAGE>

        (x)  "Parent" shall mean any company (other than the Company) in an
unbroken chain of companies ending with the Company if, at the time of granting
an award under the Plan, each of the companies other than the Company owns stock
possessing fifty percent (50%) or more of the total combined voting power of all
classes of stock in one of the other companies in such chain.

        (y)  "Plan" means this Net2Phone, Inc. 1999 Stock Option and Incentive
Plan, as amended from time to time.

        (z)  "Related Entity" means any Parent, Subsidiary or any business,
corporation, partnership, limited liability company or other entity in which the
Company, a Parent or a Subsidiary holds a controlling ownership interest,
directly or indirectly. IDT and each of its Subsidiaries shall be deemed to be a
Related Entity for so long as IDT, together with any of its Subsidiaries, shall
be the beneficial owner of at least 20.0% of the outstanding aggregate amount of
Common Stock and Class A Stock of the Corporation.

        (aa) "Restricted Period" shall have the meaning set forth in Section 11.

        (bb) "Restricted Stock" means shares of Common Stock issued under the
Plan to a Grantee for such consideration, if any, and subject to such
restrictions on transfer, rights of refusal, repurchase provisions, forfeiture
provisions and other terms and conditions as shall be determined by the
Committee.

        (cc) "Retirement" shall mean a Grantee's retirement in accordance with
the terms of any tax-qualified retirement plan maintained by the Company or any
of its affiliates in which the Grantee participates.

        (dd) "Rule 16b-3" shall mean Rule 16b-3, as from time to time in effect,
promulgated under the Exchange Act, including any successor to such Rule.

        (ee) "Stock Appreciation Right" shall mean the right, granted to a
Grantee under Section 9, to be paid an amount measured by the appreciation in
the Fair Market Value of a share of Common Stock from the date of grant to the
date of exercise of the right, with payment to be made in cash or Common Stock
as specified in the award or determined by the Committee.

        (ff) "Subsidiary" shall mean any company (other than the Company) in an
unbroken chain of companies beginning with the Company if, at the time of
granting an Option, each of the companies other than the last company in the
unbroken chain owns stock possessing fifty percent (50%) or more of the total
combined voting power of all classes of stock in one of the other companies in
such chain.

        (gg) "Tax Event" shall have the meaning set forth in Section 17.

        (hh) "Ten Percent Stockholder" shall mean a Grantee who, at the time an
Incentive Stock Option is granted, owns stock possessing more than ten percent
(10%) of the total combined voting power of all classes of stock of the Company
or any Parent or Subsidiary.

                                       4
<PAGE>

3.  Administration.
- --  --------------
        (a)  The Plan shall be administered by the Committee, the members of
which shall, except as may otherwise be determined by the Board, be "non-
employee directors" under Rule 16b-3 and "outside directors" under Section
162(m) of the Code. Prior to the formation of the Committee, the Board shall
exercise all powers of the Committee set forth herein.

        (b)  The Committee shall have the authority in its discretion, subject
to and not inconsistent with the express provisions of the Plan, to administer
the Plan and to exercise all the powers and authorities either specifically
granted to it under the Plan or necessary or advisable in the administration of
the Plan, including, without limitation, the authority to grant Options, Stock
Appreciation Rights, Limited Rights and Restricted Stock; to determine which
options shall constitute Incentive Stock Options and which Options shall
constitute Nonqualified Stock Options; to determine which Options (if any) shall
be accompanied by Limited Rights; to determine the purchase price of the shares
of Common Stock covered by each option; to determine the persons to whom, and
the time or times at which awards shall be granted; to determine the number of
shares to be covered by each award; to interpret the Plan; to prescribe, amend
and rescind rules and regulations relating to the Plan; to determine the terms
and provisions of the Agreements (which need not be identical) and to cancel or
suspend awards, as necessary; and to make all other determinations deemed
necessary or advisable for the administration of the Plan.

        (c)  All decisions, determinations and interpretations of the Committee
shall be final and binding on all Grantees of any awards under this Plan. No
member of the Board or Committee shall be liable for any action taken or
determination made in good faith with respect to the Plan or any award granted
hereunder.

4.  Eligibility.
- --  -----------

          Awards may be granted to executive officers, other key employees,
directors and consultants of the Company or of any Related Entity.  In addition
to any other awards granted to Non-Employee Directors hereunder, awards shall be
granted to Non-Employee Directors pursuant to Section 14 hereof.  In determining
the persons to whom awards shall be granted and the number of shares to be
covered by each award, the Committee shall take into account the duties of the
respective persons, their present and potential contributions to the success of
the Company and such other factors as the Committee shall deem relevant in
connection with accomplishing the purposes of the Plan.

5.  Stock.
- --  -----

        (a)  The maximum number of shares of Common Stock reserved for the grant
of awards under the Plan shall be 11,040,000, subject to adjustment as provided
in Section 12 hereof. Such shares may, in whole or in part, be authorized but
unissued shares or shares that shall have been or may be reacquired by the
Company.

        (b)  If any outstanding award under the Plan should, for any reason
expire, be canceled or be forfeited (other than in connection with the exercise
of a Stock Appreciation

                                       5
<PAGE>

Right or a Limited Right), without having been exercised in full, the shares of
Common Stock allocable to the unexercised, canceled or terminated portion of
such award shall (unless the Plan shall have been terminated) become available
for subsequent grants of awards under the Plan.

        (c)  Except as the Committee may otherwise determine, in no event may a
Grantee be granted during any calendar year Options to acquire more than 750,000
shares of Common Stock or more than 750,000 shares of Restricted Stock, in each
case subject to adjustment as provided in Section 12 hereof.

6.  Terms and Conditions of Options.
- --  -------------------------------

        (a)  OPTION AGREEMENT. Each Option granted pursuant to the Plan shall be
evidenced by a written agreement between the Company and the Grantee (the
"Option Agreement"), in such form and containing such terms and conditions as
the Committee shall from time to time approve, which Option Agreement shall
comply with and be subject to the following terms and conditions, unless
otherwise specifically provided in such Option Agreement. For purposes of
interpreting this Section 6, a director's service as a member of the Board shall
be deemed to be employment with the Company.

        (b)  NUMBER OF SHARES. Each Option Agreement shall state the number of
shares of Common Stock to which the Option relates.

        (c)  TYPE OF OPTION. Each Option Agreement shall specifically state that
the Option constitutes an Incentive Stock Option or a Nonqualified Stock Option.
In the absence of such designation, the Option will be deemed to be a
Nonqualified Stock Option.

        (d)  OPTION PRICE. Each Option Agreement shall state the Option Price,
which, in the case of an Incentive Stock Option, shall not be less than one
hundred percent (100%) of the Fair Market Value of the shares of Common Stock
covered by the Option on the date of grant. The Option Price shall be subject to
adjustment as provided in Section 12 hereof.

        (e)  MEDIUM AND TIME OF PAYMENT. The Option Price shall be paid in full,
at the time of exercise, in cash or in shares of Common Stock (whether then
owned by the Grantee or issuable upon exercise of the Option) having a Fair
Market Value equal to such Option Price or in a combination of cash and Common
Stock, including a cashless exercise procedure through a broker-dealer;
provided, however, that in the case of an Incentive Stock Option,
- --------  -------
the medium of payment shall be determined at the time of grant and set forth in
the applicable Option Agreement.

        (f)  TERM AND EXERCISABILITY OF OPTIONS. Each Option Agreement shall
provide the exercise schedule for the Option as determined by the Committee,
provided, that, the Committee shall have the authority to accelerate the
- --------  ----
exercisability of any outstanding option at such time and under such
circumstances as it, in its sole discretion, deems appropriate. The exercise
period will be ten (10) years from the date of the grant of the option unless
otherwise determined by the Committee; provided, however, that in the case of
                                       --------  -------
an Incentive Stock Option, such exercise period shall not exceed ten (10) years
from the date of grant of such Option. The exercise period shall be subject to
earlier termination as provided in

                                       6
<PAGE>

Sections 6(g) and 6(h) hereof. An Option may be exercised, as to any or all full
shares of Common Stock as to which the Option has become exercisable, by written
notice delivered in person or by mail to the Company's transfer agent or other
administrator designated by the Company, specifying the number of shares of
Common Stock with respect to which the Option is being exercised.

        (g)  TERMINATION. Except as provided in this Section 6(g) and in Section
6(h) hereof, an Option may not be exercised unless the Grantee is then in the
employ of or maintaining a director or consultant relationship with the Company
or a Related Entity (or a company or a Parent or Subsidiary of such company
issuing or assuming the Option in a transaction to which Section 424(a) of the
Code applies), and unless the Grantee has remained continuously so employed or
in the director or consultant relationship since the date of grant of the
Option. This condition will not be satisfied if the Company's ownership of the
voting stock of a Subsidiary (or a Parent's ownership of the Company) is reduced
to less than 50% as a result of any sales or transfers of Securities by the
Parent, the Company or such Subsidiary. In the event that the employment or
consultant relationship of a Grantee shall terminate (other than by reason of
death, Disability or Retirement), all Options of such Grantee that are
exercisable at the time of Grantee's termination may, unless earlier terminated
in accordance with their terms, be exercised within three (3) months after the
date of such termination (or such different period as the Committee shall
prescribe).

        (h)  DEATH, DISABILITY OR RETIREMENT OF GRANTEE. If a Grantee shall die
while employed by, or maintaining a director or consultant relationship with,
the Company or a Related Entity, or within thirty (30) days after the date of
termination of such Grantee's employment, director or consultant relationship
(or within such different period as the Committee may have provided pursuant to
Section 6(g) hereof), or if the Grantee's employment, director or consultant
relationship shall terminate by reason of Disability, all Options theretofore
granted to such Grantee (to the extent otherwise exercisable) may, unless
earlier terminated in accordance with their terms, be exercised by the Grantee
or by the Grantee's estate or by a person who acquired the right to exercise
such Options by bequest or inheritance or otherwise by result of death or
Disability of the Grantee, at any time within 180 days after the death or
Disability of the Grantee (or such different period as the Committee shall
prescribe). In the event that an Option granted hereunder shall be exercised by
the legal representatives of a deceased or former Grantee, written notice of
such exercise shall be accompanied by a certified copy of letters testamentary
or equivalent proof of the right of such legal representative to exercise such
Option. In the event that the employment or consultant relationship of a Grantee
shall terminate on account of such Grantee's Retirement, all Options of such
Grantee that are exercisable at the time of such Retirement may, unless earlier
terminated in accordance with their terms, be exercised at any time within one
hundred eighty (180) days after the date of such Retirement (or such different
period as the Committee shall prescribe). Unless otherwise provided in the
applicable Agreement, in the case of awards granted to consultants who do not
provide services to the Company or to a Related Entity on an ongoing basis, for
the purpose of determining the rights of such consultant under the Plan, the
Committee shall determine the date, if any, upon which the consultant's
relationship with the Company or the Related Entity shall have been terminated.

                                       7
<PAGE>

        (i)  OTHER PROVISIONS. The Option Agreements evidencing awards under the
Plan shall contain such other terms and conditions not inconsistent with the
Plan as the Committee may approve.

7.  Nonqualified Stock Options.
- --  --------------------------

          Options granted pursuant to this Section 7 are intended to constitute
Nonqualified Stock Options and shall be subject only to the general terms and
conditions specified in Section 6 hereof.

8.  Incentive Stock Options.
- --  -----------------------

          Options granted pursuant to this Section 8 are intended to constitute
Incentive Stock Options and shall be subject to the following special terms and
conditions, in addition to the general terms and conditions specified in Section
6 hereof:

        (a) LIMITATION ON VALUE OF SHARES. To the extent that the aggregate Fair
Market Value of shares of Common Stock subject to Options designated as
Incentive Stock Options which become exercisable for the first time by a Grantee
during any calendar year (under all plans of the Company or any Subsidiary)
exceeds $100,000, such excess Options, to the extent of the shares covered
thereby in excess of the foregoing limitation, shall be treated as Nonqualified
Stock Options. For this purpose, Incentive Stock Options shall be taken into
account in the order in which they were granted, and the Fair Market Value of
the shares of Common Stock shall be determined as of the date that the Option
with respect to such shares was granted.

        (b) TEN PERCENT STOCKHOLDER. In the case of an Incentive Stock Option
granted to a Ten Percent Stockholder, (i) the Option Price shall not be less
than one hundred ten percent (110%) of the Fair Market Value of the shares of
Common Stock on the date of grant of such Incentive Stock Option, and (ii) the
exercise period shall not exceed five (5) years from the date of grant of such
Incentive Stock Option.

9.  Stock Appreciation Rights.
- --  -------------------------

          The Committee shall have authority to grant a Stock Appreciation Right
to the Grantee of any Option under the Plan with respect to all or some of the
shares of Common Stock covered by such related Option.  A Stock Appreciation
Right shall, except as provided in this Section 9 or as may be determined by the
Committee, be subject to the same terms and conditions as the related Option.
Each Stock Appreciation Right granted pursuant to the Plan shall be evidenced by
a written Agreement between the Company and the Grantee in such form as the
Committee shall from time to time approve, which Agreement shall comply with and
be subject to the following terms and conditions, unless otherwise specifically
provided in such Agreement:

        (a)  TIME OF GRANT. A Stock Appreciation Right may be granted either at
the time of grant of the related option, or at any time thereafter during
the term of the Option; provided, however that Stock Appreciation Rights
                        --------  -------
related to Incentive Stock Options may only be granted at the time of grant
of the related Option.

                                       8
<PAGE>

        (b)  PAYMENT. A Stock Appreciation Right shall entitle the holder
thereof, upon exercise of the Stock Appreciation Right or any portion thereof,
to receive payment of an amount computed pursuant to Section 9(d).

        (c)  EXERCISE. A Stock Appreciation Right shall be exercisable at such
time or times and only to the extent that the related Option is exercisable, and
will not be transferable except to the extent the related option may be
transferable. A Stock Appreciation Right granted in connection with an Incentive
Stock Option shall be exercisable only if the Fair Market Value of a share of
Common Stock on the date of exercise exceeds the purchase price specified in the
related Incentive Stock Option. Unless otherwise approved by the Committee, no
Grantee shall be permitted to exercise any Stock Appreciation Right (i) until
six (6) months have elapsed from the date of grant or (ii) during the period
beginning two weeks prior to the end of each of the Company's fiscal quarters
and ending on the second business day following the day on which the Company
releases to the public a summary of its fiscal results for such period.

        (d) AMOUNT PAYABLE. Upon the exercise of a Stock Appreciation Right, the
Optionee shall be entitled to receive an amount determined by multiplying (i)
the excess of the Fair Market Value of a share of Common Stock on the date of
exercise of such Stock Appreciation Right over the Option Price of the related
Option, by (ii) the number of shares of Common Stock as to which such Stock
Appreciation Right is being exercised.

        (e) TREATMENT OF RELATED OPTIONS AND STOCK APPRECIATION RIGHTS UPON
EXERCISE. Upon the exercise of a Stock Appreciation Right, the related Option
shall be canceled to the extent of the number of shares of Common Stock as to
which the Stock Appreciation Right is exercised. Upon the exercise or surrender
of an option granted in connection with a Stock Appreciation Right, the Stock
Appreciation Right shall be canceled to the extent of the number of shares of
Common Stock as to which the Option is exercised or surrendered.

        (f) METHOD OF EXERCISE. Stock Appreciation Rights shall be exercised by
a Grantee only by a written notice delivered to the Company in accordance with
procedures specified by the Company from time to time. Such notice shall state
the number of shares of Common Stock with respect to which the Stock
Appreciation Right is being exercised. A Grantee may also be required to deliver
to the Company the underlying Agreement evidencing the Stock Appreciation Right
being exercised and any related Option Agreement so that a notation of such
exercise may be made thereon, and such Agreements shall then be returned to the
Grantee.

        (g) FORM OF PAYMENT. Payment of the amount determined under Section 9(d)
may be made solely in whole shares of Common Stock in a number based upon their
Fair Market Value on the date of exercise of the Stock Appreciation Right or,
alternatively, at the sole discretion of the Committee, solely in cash, or in a
combination of cash and shares of Common Stock as the Committee deems advisable.
If the Committee decides to make full payment in shares of Common Stock, and the
amount payable results in a fractional share, payment for the fractional share
will be made in cash.

                                       9
<PAGE>

10.  Limited Stock Appreciation Rights.
- ---  ---------------------------------

          The Committee shall have authority to grant a Limited Right to the
Grantee of any Option under the Plan with respect to all or some of the shares
of Common Stock covered by such related Option.  Each Limited Right granted
pursuant to the Plan shall be evidenced by a written Agreement between the
Company and the Grantee, in such form as the Committee shall from time to time
approve, which Agreement shall comply with and be subject to the following terms
and conditions, unless otherwise specifically provided in such Agreement:

        (a)  TIME OF GRANT. A Limited Right granted in tandem with a
Nonqualified Stock Option may be granted either at the time of grant of the
related Option or any time thereafter during its term. A Limited Right granted
in tandem with an Incentive Stock Option may only be granted at the time of
grant of the related Option.

        (b)  EXERCISE.  A Limited Right may be exercised only (i) during the
ninety-day period following the occurrence of a Change in Control or (ii)
immediately prior to the effective date of a Corporate Transaction. Each Limited
Right shall be exercisable only if, and to the extent that, the related Option
is exercisable and, in the case of a Limited Right granted in tandem with an
Incentive Stock Option, only when the Fair Market Value per share of Common
Stock exceeds the Option Price per share. Notwithstanding the provisions of the
two immediately preceding sentences (or unless otherwise approved by the
Committee), a Limited Right granted to a Grantee who is an Insider must be (x)
held by the Insider for at least six (6) months from the date of grant of the
Limited Right before it becomes exercisable and (y) automatically paid out in
cash to the Insider upon the occurrence of a Change in Control or a Corporate
Transaction (provided such six (6) month holding period requirement has been
met).

        (c)  AMOUNT PAYABLE.  Upon the exercise of a Limited Right, the Grantee
thereof shall receive in cash whichever of the following amounts is applicable:

                (i)  in the case of the realization of Limited Rights by reason
     of an acquisition of Common Stock described in clause (i) of the definition
     of "Change in Control" (Section 2(c) above), an amount equal to the
     Acquisition Spread as defined in Section 10(d)(ii) below; or

                (ii) in the case of the realization of Limited Rights by reason
     of stockholder approval of an agreement or plan described in clause (i) of
     the definition of "Corporate Transaction" (Section 2(j) above), an amount
     equal to the Merger Spread as defined in Section 10(d)(iv) below; or

                (iii)  in the case of the realization of Limited Rights by
     reason of the change in composition of the Board described in clause (ii)
     of the definition of "Change in Control" or stockholder approval of a plan
     or agreement described in clause (ii) of the definition of Corporate
     Transaction, an amount equal to the Spread as defined in Section 10(d)(v)
     below.

          Notwithstanding the foregoing provisions of this Section 10(c) (or
unless otherwise approved by the Committee), in the case of a Limited Right
granted in respect of an

                                       10
<PAGE>

Incentive Stock Option, the Grantee may not receive an amount in excess of the
maximum amount that will enable such option to continue to qualify under the
Code as an Incentive Stock Option.

        (d)  DETERMINATION OF AMOUNTS PAYABLE.  The amounts to be paid to a
     Grantee pursuant to Section 10(c) shall be determined as follows:

                (i)  The term "Acquisition Price per Share" as used herein shall
     mean, with respect to the exercise of any Limited Right by reason of an
     acquisition of Common Stock described in clause (i) of the definition of
     Change in Control, the greatest of (A) the highest price per share shown on
     the Statement on Schedule 13D or amendment thereto filed by the holder of
     25% or more of the voting power of the Company that gives rise to the
     exercise of such Limited Right, (B) the highest price paid in any tender or
     exchange offer which is in effect at any time during the ninety-day period
     ending on the date of exercise of the Limited Right, or (C) the highest
     Fair Market Value per share of Common Stock during the ninety-day period
     ending on the date the Limited Right is exercised.

                (ii) The term "Acquisition Spread" as used herein shall mean an
     amount equal to the product computed by multiplying (A) the excess of (1)
     the Acquisition Price per Share over (2) the Option Price per share of
     Common Stock at which the related option is exercisable, by (B) the number
     of shares of Common Stock with respect to which such Limited Right is being
     exercised.

                (iii)  The term "Merger Price per Share" as used herein shall
     mean, with respect to the exercise of any Limited Right by reason of
     stockholder approval of an agreement described in clause (i) of the
     definition of Corporate Transaction, the greatest of (A) the fixed or
     formula price for the acquisition of shares of Common Stock specified in
     such agreement, if such fixed or formula price is determinable on the date
     on which such Limited Right is exercised, (B) the highest price paid in any
     tender or exchange offer which is in effect at any time during the ninety-
     day period ending on the date of exercise of the Limited Right, (C) the
     highest Fair Market Value per share of Common Stock during the ninety-day
     period ending on the date on which such Limited Right is exercised.

                (iv) The term "Merger Spread" as used herein shall mean an
     amount equal to the product computed by multiplying (A) the excess of (1)
     the Merger Price per Share over (2) the Option Price per share of Common
     Stock at which the related Option is exercisable, by (B) the number of
     shares of Common Stock with respect to which such Limited Right is being
     exercised.

                (v) The term "Spread" as used herein shall mean, with respect to
     the exercise of any Limited Right by reason of a change in the composition
     of the Board described in clause (ii) of the definition of Change in
     Control or stockholder approval of a plan or agreement described in clause
     (ii) of the definition of Corporate Transaction, an amount equal to the
     product computed by multiplying (i) the excess of (A) the greater of (1)
     the highest price paid in any tender or exchange offer which is in effect
     at any time

                                       11
<PAGE>

     during the ninety-day period ending on the date of exercise of the
     Limited Right or (2) the highest Fair Market Value per share of Common
     Stock during the ninety-day period ending on the date the Limited Right is
     exercised over (B) the Option Price per share of Common Stock at which the
     related Option is exercisable, by (ii) the number of shares of Common Stock
     with respect to which the Limited Right is being exercised.

        (e)  TREATMENT OF RELATED OPTIONS AND LIMITED RIGHTS UPON EXERCISE.
Upon the exercise of a Limited Right, the related Option shall cease to be
exercisable to the extent of the shares of Common Stock with respect to which
such Limited Right is exercised but shall be considered to have been exercised
to that extent for purposes of determining the number of shares of Common Stock
available for the grant of further awards pursuant to this Plan. Upon the
exercise or termination of a related Option, the Limited Right with respect to
such related Option shall terminate to the extent of the shares of Common Stock
with respect to which the related Option was exercised or terminated.

        (f)  METHOD OF EXERCISE.  To exercise a Limited Right, the Grantee shall
(i) deliver written notice to the Company specifying the number of shares of
Common Stock with respect to which the Limited Right is being exercised, and
(ii) if requested by the Committee, deliver to the Company the Agreement
evidencing the Limited Rights being exercised and, if applicable, the Option
Agreement evidencing the related Option; the Company shall endorse thereon a
notation of such exercise and return such Agreements to the Grantee. The date of
exercise of a Limited Right that is validly exercised shall be deemed to be the
date on which there shall have been delivered the instruments referred to in the
first sentence of this paragraph (f).

11.  Restricted Stock.
- ---  ----------------

          The Committee may award shares of Restricted Stock to any eligible
employee or consultant.  Each award of Restricted Stock under the Plan shall be
evidenced by a written Agreement between the Company and the Grantee, in such
form as the Committee shall from time to time approve, which Agreement shall
comply with and be subject to the following terms and conditions, unless
otherwise specifically provided in such Agreement:

        (a)  NUMBER OF SHARES. Each Agreement shall state the number of shares
of Restricted Stock to be subject to an award.

        (b)  RESTRICTIONS.  Shares of Restricted Stock may not be sold,
assigned, transferred, pledged, hypothecated or otherwise disposed of, except by
will or the laws of descent and distribution, for such period as the Committee
shall determine from the date on which the award is granted (the "Restricted
Period"). The Committee may also impose such additional or alternative
restrictions and conditions on the shares as it deems appropriate including the
satisfaction of performance criteria. Such performance criteria may include
sales, earnings before interest and taxes, return on investment, earnings per
share, any combination of the foregoing or rate of growth of any of the
foregoing, as determined by the Committee. Certificates for shares of stock
issued pursuant to Restricted Stock awards shall bear an appropriate legend
referring to such restrictions, and any attempt to dispose of any such shares of
stock in contravention of such restrictions shall be null and void and without
effect. During the


                                       12
<PAGE>

Restricted Period, such certificates shall be held in escrow by an escrow agent
appointed by the Committee. In determining the Restricted Period of an award,
the Committee may provide that the foregoing restrictions shall lapse with
respect to specified percentages of the awarded shares on successive
anniversaries of the date of such award.

        (c)  FORFEITURE. Subject to such exceptions as may be determined by the
Committee, if the Grantee's continuous employment or consultant relationship
with the Company or a Related Entity shall terminate for any reason prior to the
expiration of the Restricted Period of an award, any shares remaining subject to
restrictions (after taking into account the provisions of Subsection (e) of this
Section 11) shall thereupon be forfeited by the Grantee and transferred to, and
retired by, the Company without cost to the Company or such Related Entity.

        (d)  OWNERSHIP. During the Restricted Period the Grantee shall possess
all incidents of ownership of such shares, subject to Subsection (b) of this
Section 11, including the right to receive dividends with respect to such shares
and to vote such shares.

        (e)  ACCELERATED LAPSE OF RESTRICTIONS.  Upon the occurrence of any of
the events specified in Section 13 (and subject to the conditions set forth
therein), all restrictions then outstanding on any shares of Restricted Stock
awarded under the Plan shall lapse as of the applicable date set forth in
Section 13. The Committee shall have the authority (and the Agreement may so
provide) to cancel all or any portion of any outstanding restrictions prior to
the expiration of the Restricted Period with respect to any or all of the shares
of Restricted Stock awarded on such terms and conditions as the Committee shall
deem appropriate.

12.  Effect of Certain Changes.
- ---  -------------------------

        (a)  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION.  In the event of any
extraordinary dividend, stock dividend (including a spin-off or split-off of a
Subsidiary), recapitalization, merger, consolidation, stock split, warrant or
rights issuance, or combination or exchange of such shares, or other similar
transactions, the Committee shall equitably adjust (i) the maximum number of
Options or shares of Restricted Stock that may be awarded to a Grantee in any
calendar year (as provided in Section 5 hereof), (ii) the number of shares of
Common Stock available for awards under the Plan, (iii) the number of such
shares covered by outstanding awards and/or (iv) the price per share of Options
or the applicable market value of Stock Appreciation Rights or Limited Rights,
in each such case so as to reflect such event and preserve the value of such
awards; provided, however, that any fractional shares resulting from such
        --------  -------
adjustment shall be eliminated.

        (b)  CHANGE IN COMMON STOCK.  In the event of a change in the Common
Stock of the Company as presently constituted that is limited to a change of all
of its authorized shares of Common Stock into the same number of shares with a
different par value or without par value, the shares resulting from any such
change shall be deemed to be the Common Stock within the meaning of the Plan.

                                       13
<PAGE>

13.  Corporate Transaction.
- ---  ---------------------

          Unless otherwise provided in the applicable Agreement, in the event of
a Corporate Transaction, each award which is at the time outstanding and
unexercised under the Plan shall automatically terminate and, in the case of an
award of Restricted Stock, shall be released from any restrictions on transfer
and repurchase or forfeiture rights, immediately prior to the specified
effective date of such Corporate Transaction.  However, all such awards shall
not terminate if the awards are, in connection with the Corporate Transaction,
assumed by the successor corporation or Parent thereof.

14.  Non-Employee Director Options.
- ---  -----------------------------

          The provisions of this Section 14 shall apply only to certain grants
of Options to Non-Employee Directors, as provided below.  Except as set forth in
this Section 14, the other provisions of the Plan shall apply to grants of
Options to Non-Employee Directors to the extent not inconsistent with this
Section.  For purposes of interpreting Section 6 of the Plan, a Non-Employee
Director's service as a member of the Board shall be deemed to be employment
with the Company.

        (a)  GENERAL.  Non-Employee Directors shall receive Nonqualified Stock
Options in accordance with this Section 14. The Option Price per share of Common
Stock purchasable under Options granted to Non-Employee Directors shall be the
Fair Market Value of a share on the date of grant. Options granted pursuant to
this Section 14 shall be subject to the terms of such section and shall not be
subject to discretionary acceleration of exercisability by the Committee.

        (b)  INITIAL GRANTS.  On the date of the Initial Public Offering, each
Non-Employee Director will be granted automatically, without action by the
Committee, an Option to purchase 10,000 shares of Common Stock. The Option Price
shall equal the offering price of the Common Stock in connection with the
Initial Public Offering.

        (c)  SUBSEQUENT GRANTS.  Each person who, after the Initial Public
Offering, becomes a Non-Employee Director for the first time, will, at the time
such director is elected and duly qualified, be granted automatically, without
action by the Committee, an Option to purchase 10,000 shares of Common Stock.
The Option Price shall equal the Fair Market Value of the Common Stock as of the
date of grant.

        (d)  ANNUAL GRANTS.  On each anniversary date of a Non-Employee
Director's initial election to the Board, such Non-Employee Director will be
granted automatically, without action by the Committee, an Option to purchase
10,000 shares of Common Stock. The Option Price shall equal the Fair Market
Value of the Common Stock as of the date of grant.

        (e)  VESTING.  Each option granted under this Section 14 shall be fully
exercisable on the date of grant. Sections 6(f), 6(g) and 6(h) hereof shall not
apply to Options granted to Non-Employee Directors.

                                       14
<PAGE>

        (f)  DURATION.  Each Option granted to a Non-Employee Director shall
expire on the first to occur of (i) the tenth anniversary of the date of grant
of the Option, (ii) the first anniversary of the Non-Employee Director's
termination of service as a member of the Board other than for Cause or (iii)
three months following the Non-Employee Director's removal from the Board for
Cause. The Committee may not provide for an extended exercise period beyond the
periods set forth in this Section 14.

        (g)  DEFINITION OF "CAUSE."  For purposes of this Section 14, "cause"
shall mean the termination of service as a member of the Board by a Non-Employee
Director due to any act of (i) fraud or intentional misrepresentation, (ii)
embezzlement, misappropriation or conversion of assets or opportunities of the
Company or any Subsidiary, or (iii) any other act deemed by the Board to be
detrimental to the Company.

15.  Period During which Awards May Be Granted.
- ---  -----------------------------------------
          Awards may be granted pursuant to the Plan from time to time within a
period of ten (10) years from April 27, 1999, the date the Plan was initially
adopted by the Board.

16.  Transferability of Awards.
- ---  -------------------------

        (a)  Incentive Stock Options (and any Stock Appreciation Rights related
thereto) may not be sold, pledged, assigned, hypothecated, transferred or
disposed of in any manner other than by the laws of descent and distribution and
may be exercised, during the lifetime of the Grantee, only by the Grantee or his
or her guardian or legal representative.

        (b)  Nonqualified Stock Options (together with any Stock Appreciation
Rights or Limited Rights related thereto) shall be transferable in the manner
and to the extent acceptable to the Committee, as may be evidenced by a writing
signed by the Company and the Grantee, or in such other matter as the Committee
shall provide. Notwithstanding the transfer by a Grantee of a Nonqualified Stock
Option, the Grantee will continue to remain subject to the withholding tax
requirements set forth in Section 17 hereof.

        (c)  The terms of any award granted under the Plan, including the
transferability of any such award, shall be binding upon the executors,
administrators, heirs and successors of the Grantee.

17.  Agreement by Grantee regarding Withholding Taxes.
- ---  ------------------------------------------------

          If the Committee shall so require, as a condition of exercise of an
Option, Stock Appreciation Right or Limited Right or the expiration of a
Restricted Period (each, a "Tax Event"), each Grantee shall agree that no later
than the date of the Tax Event, the Grantee will pay to the Company or make
arrangements satisfactory to the Committee regarding payment of any federal,
state or local taxes of any kind required by law to be withheld upon the Tax
Event.  Alternatively, the Committee may provide that a Grantee may elect, to
the extent permitted or required by law, to have the Company deduct federal,
state and local taxes of any kind required by law to be withheld upon the Tax
Event from any payment of any kind due to the Grantee.  The withholding
obligation may be satisfied by the withholding or delivery of Common Stock.

                                       15
<PAGE>

18.  Rights as a Stockholder.
- ---  -----------------------

          Except as provided in Section 11(d) hereof, a Grantee or a transferee
of an award shall have no rights as a stockholder with respect to any shares
covered by the award until the date of the issuance of a stock certificate to
him or her for such shares.  No adjustment shall be made for dividends (ordinary
or extraordinary, whether in cash, securities or other property) or distribution
of other rights for which the record date is prior to the date such stock
certificate is issued, except as provided in Section 12(a) hereof.

19.  No Rights to Employment.
- ---  -----------------------

          Nothing in the Plan or in any award granted or Agreement entered into
pursuant hereto shall confer upon any Grantee the right to continue in the
employ of, or in a consultant relationship with, the Company or any Related
Entity or to be entitled to any remuneration or benefits not set forth in the
Plan or such Agreement or to interfere with or limit in any way the right of the
Company or any such Related Entity to terminate such Grantee's employment.
Awards granted under the Plan shall not be affected by any change in duties or
position of a Grantee as long as such Grantee continues to be employed by, or in
a consultant relationship with, the Company or any Related Entity.

20.  Beneficiary.
- ---  -----------

          A Grantee may file with the Committee a written designation of a
beneficiary on such form as may be prescribed by the Committee and may, from
time to time, amend or revoke such designation.  If no designated beneficiary
survives the Grantee, the executor or administrator of the Grantee's estate
shall be deemed to be the Grantee's beneficiary.

21.  Stockholder Approval; Amendment and Termination of the Plan.
- ---  ------------------------------------------------------------

        (a)  STOCKHOLDER APPROVAL.  The Plan initially became effective when
adopted by the Board and stockholders of the Company on April 27, 1999 and shall
terminate on the tenth anniversary of such date. This amendment and restatement
of the Plan became effective upon its adoption by the Board on May 17, 1999.

        (b)  AMENDMENT AND TERMINATION OF THE PLAN.  The Board at any time and
from time to time may suspend, terminate, modify or amend the Plan; however,
unless otherwise determined by the Board, an amendment that requires stockholder
approval in order for the Plan to continue to comply with Rule 16b-3 or any
other law, regulation or stock exchange requirement shall not be effective
unless approved by the requisite vote of stockholders. Except as provided in
Section 12(a) hereof, no suspension, termination, modification or amendment of
the Plan may adversely affect any award previously granted, unless the written
consent of the Grantee is obtained.

22.  Governing Law.
- ---  -------------
          The Plan and all determinations made and actions taken pursuant hereto
shall be governed by the laws of the State of Delaware.

                                       16

<PAGE>

                                                                   Exhibit 10.20

                             STOCKHOLDERS AGREEMENT
                             ----------------------

          STOCKHOLDERS AGREEMENT (this "Agreement"), dated as of May 13, 1999,
                                        ---------
by and among IDT Corporation, a Delaware corporation ("IDT"), and Clifford M.
Sobel ("Sobel") (together with IDT, the "Majority Stockholders"), Net2Phone,
        -----                            ---------------------
Inc., a Delaware corporation (the "Company"), and the additional investors
listed on Schedule A hereto (the "Series A Investors").
                                  ------------------

          WHEREAS, each of the Series A Investors has executed and delivered a
Series A Subscription Agreement, dated as of May 13, 1999 (collectively, the
"Series A Subscription Agreement"), by and among the Company and each such
 -------------------------------
Series A Investor for the purchase of Series A Convertible Preferred Stock of
the Company, par value $.01 per share (the "Series A Preferred"), and Warrants
                                            ------------------
(the "Warrants") to purchase Common Stock of the Company, par value $.01 per
      --------
share (the "Common Stock").
            ------------

          WHEREAS, Sobel holds shares individually and has donated shares to the
Scott Sobel Annual Gift Trust (the "Sobel Trust").
                                    -----------

          WHEREAS, Sobel is entering into this Agreement with respect to the
shares of Common Stock held by him and a trustee is entering into this Agreement
on behalf of the Sobel Trust.

          WHEREAS, it is a condition to the Series A Investors entering into the
Series A Subscription Agreements that the Majority Stockholders enter into this
Agreement.

          NOW, THEREFORE, the Majority Stockholders and each of the Series A
Investors hereby agree as follows:

1.  Defined Terms.  Capitalized terms used herein and not otherwise defined
    -------------
herein shall have the meanings given to them in the Series A Subscription
Agreements.

2.  Election of Directors.  (a) The Majority Stockholders agree that at the next
    ---------------------
meeting of stockholders of the Company following the date of this Agreement (the
"Stockholders' Meeting"), and for so long as the Series A Investors who are
 ---------------------
affiliates of Softbank (the "Softbank Investors") hold a majority of the shares
                             ------------------
of Series A Preferred originally purchased pursuant to their respective
Subscription Agreements or the capital stock into which such shares of Series A
Preferred are convertible, they will vote all of their respective shares of
capital stock in the Company in favor of the election of, and take all other
actions necessary to cause the election of, a director nominated by the Softbank
Investors (the "Softbank Director"), and shall, upon the request of the Softbank
                -----------------
Investors, use their best efforts to cause such director to be appointed to the
Company's audit committee or compensation committee.  In the event that the
Softbank Investors elect to terminate the appointment of the Softbank Director,
or fail to nominate a

                                       1
<PAGE>

candidate, the Majority Stockholders will nominate and elect a director of their
choosing in place of the Softbank Director.

(b)  The Majority Stockholders agree that at the Stockholders' Meeting, and for
so long as GE Capital Equity Investments Inc., its affiliates or beneficial
owners (collectively, the "GE Investors") hold a majority of the shares of
                           ------------
Series A Preferred originally purchased pursuant to their respective
Subscription Agreements or the capital stock into which such shares of Series A
Preferred are convertible, they will vote all of their respective shares of
capital stock in the Company in favor of the election of, and take all other
actions necessary to cause the election of, a director nominated by the GE
Investors (the "GE Director"), and shall, upon the request of the GE Investors,
                -----------
use their best efforts to cause such director to be appointed to whichever of
the Company's audit committee or compensation committee to which the Softbank
Director is not elected.

3.   Transfer Restrictions.  Except as otherwise set forth in this Section 3,
     ---------------------
each Series A Investor agrees not to sell, transfer or otherwise dispose of,
pledge, collateralize, hypothecate or enter into any contract, option or other
arrangement or understanding with respect to the sale, transfer or other
disposition, pledge, collateralization, or hypothecation (any such event, a
"Disposition") of its shares of Series A Preferred or Warrants, or Common Stock
 -----------
underlying such securities, for a period of 180 days following the date upon
which a registration statement relating to an initial public offering of the
Company which results in the conversion of the Series A Preferred pursuant to
the Certificate of Designation is declared effective.  No Series A Investor nor
any Majority Stockholder may for a period of 36 months from the date of this
Agreement, make any Dispositions to any Competitor of the Company.  If, after 36
months from the date of this Agreement, a Series A Investor elects to make a
Disposition to a Competitor of the Company, such Disposition shall be subject to
a right of first refusal by the Company as set forth in Exhibit A hereto.  For
purposes of this Agreement, a "Competitor" shall mean any person or entity who
derives a majority of its revenue from providing Internet telephony services.
Notwithstanding anything contained herein, there shall be no restrictions on
transfer between Series A Investors or from a Series A Investor to any of its
affiliates or beneficial owners or to IDT or the Company, nor shall there be any
restrictions on any Disposition (i) which have been consented to by the Company,
(ii) pursuant to a third party tender offer, (iii) pursuant to a merger,
consolidation or reorganization to which the Company is a party, (iv) in a bona
fide public distribution or bona fide underwritten public offering, or (v)
pursuant to Section 144 or Section 144A of the Securities Act (including
distributions by a partnership to its partners or a limited liability company to
its members); provided, however, that in the case of any such permitted transfer
              --------  -------
to an affiliate or beneficial owner of a Series A Investor or Majority
Stockholder, this contract shall be binding on the affiliate or beneficial
owner.

4.   Representations, Warranties and Acknowledgments of IDT.  IDT hereby
     ------------------------------------------------------
represents, warrants and acknowledges to Sobel and the Series A Investors as
follows:

(i)  Organization and Qualification.  IDT has been duly organized and is validly
     ------------------------------
existing and is in good standing under the laws of the State of Delaware,
and has all requisite corporate power

                                       2
<PAGE>

and authority to enter into this Agreement and to consummate the transactions
contemplated hereby.

(ii)   Authorization.  All corporate actions on the part of IDT necessary for
       -------------
the authorization, execution and delivery of this Agreement and the performance
of all obligations of IDT hereunder have been taken. This Agreement has been
duly executed and delivered by IDT and constitutes a valid and legally binding
obligation of IDT, enforceable against IDT in accordance with its terms, subject
to (a) the laws of bankruptcy and the laws affecting creditors' rights
generally, and (b) the availability of equitable remedies.

(iii)  Ownership of Shares.  IDT owns of record and beneficially owns the number
       -------------------
of shares of Common Stock set forth opposite its name on Schedule B attached
hereto.

(iv)   No Proxy.  IDT has not granted and is not a party to any proxy, voting
       --------
trust or other agreement which is inconsistent with, conflicts with or violates
any provision of this Agreement.

5.     Representations, Warranties and Acknowledgment of Sobel.  Sobel hereby
       -------------------------------------------------------
represents, warrants and acknowledges to IDT and the Series A Investors as
follows:

(i)    This Agreement has been duly executed and delivered by Sobel individually
and a trustee of the Sobel Trust and constitutes a legal, valid and binding
agreement of Sobel and the Sobel Trust, enforceable against each of Sobel and
the Sobel Trust in accordance with its terms, subject to (a) the laws of
bankruptcy and the laws affecting creditors' rights generally, and (b) the
availability of equitable remedies.

(ii)   Ownership of Shares.  Sobel and the Sobel Trust own of record and
       -------------------
beneficially own the number of shares of Common Stock set forth opposite its
name on Schedule C attached hereto.

(iii)  No Proxy.  Neither Sobel nor the Sobel Trust has granted nor is either a
       --------
party to any proxy, voting trust or other agreement which is inconsistent with,
conflicts with or violates any provision of this Agreement.

6.     Representations, Warranties and Acknowledgments of the Series A
       ---------------------------------------------------------------
Investors. Each Series A Investor hereby represents, warrants and acknowledges
- ---------
to the Majority Stockholders as follows:

       Authorization.  All action on the part of such Series A Investor
       -------------
necessary for the authorization, execution and delivery of this Agreement and
the performance of all obligations of such Series A Investor hereunder has been
taken. This Agreement has been duly executed and delivered by such Series A
Investor and constitutes a valid and legally binding obligation of such
Investor, enforceable in accordance with its terms, subject to (a) the laws of
bankruptcy and the laws affecting creditors' rights generally and (b) the
availability of equitable remedies.

                                       3
<PAGE>

7.     Miscellaneous.
       -------------

7.1.   Legends.  Each of the parties consents to the printing of a legend on the
       -------
certificates representing its shares of Common Stock or Series A Preferred that
refer to the limitations on transfer set forth in this Agreement.  Unless sold
pursuant to an effective registration statement, each certificate representing
Securities shall bear a legend substantially in the following form:

                    "The shares represented by this certificate
                    have not been registered under the United
                    States Securities Act of 1933, as amended
                    (the "Act"), and may not be offered, sold
                    or otherwise transferred, pledged or
                    hypothecated unless and until such shares
                    are registered under the Act or, except as
                    otherwise permitted pursuant to Rule 144
                    under the Act or another exemption from
                    registration under the Act or an opinion
                    of counsel reasonably satisfactory to the
                    Company is obtained to the effect that such
                    registration is not required and are subject
                    to transfer restrictions as set forth in a
                    Subscription Agreement, dated May __, 1999,
                    and the operative agreements entered into in
                    connection therewith, copies of which may be
                    obtained from the Company."

The foregoing legend except for the last sentence thereof, if necessary, shall
be removed from the certificates, at the request of the holder thereof, at such
time as (i) they are sold pursuant to an effective registration statement, (ii)
they become eligible for resale pursuant to Rule 144(k) under the Act or another
provision of Rule 144 of the Act pursuant to which all such underlying Common
Shares could be sold in a single transaction, or (iii) an opinion of counsel
reasonably satisfactory to the Company is obtained to the effect that the
proposed transfer is exempt from the Act.  The transfer agent for the Securities
will issue new Securities without the legend upon receipt of a certificate from
the Investor stating that the Securities have been registered or transferred
pursuant to an effective registration statement under the Act or can be sold in
reliance upon Rule 144.

7.2.   Termination.  This Agreement shall terminate with respect to a Series A
       -----------
Investor upon the earlier to occur of (i) the mutual consent of all of the
Series A Investors and IDT or (ii) with respect to each provision of this
Agreement, in accordance with its terms.

7.3.   Specific Performance.  The parties hereto agree that the remedy at law
       --------------------
for any breach of this Agreement will be inadequate and that any party by whom
this Agreement is enforceable shall be entitled to specific performance in
addition to any other appropriate relief or remedy. Such party may, in its sole
discretion, apply to a court of competent jurisdiction for specific performance
or injunctive or such other relief as such court may deem just and proper in
order to enforce this Agreement or prevent any violation hereof and, to the
extent permitted by applicable law, each party waives any objection to the
imposition of such relief.

                                       4
<PAGE>

7.4.   Successors and Assigns.  This Agreement may not be assigned by any Series
       ----------------------
A Investor or the Majority Stockholders without the prior written consent of the
other party hereto; provided, however, that this Agreement may be transferred by
                    --------  -------
any Investor to one or more of its affiliates or beneficial owners, or to any
other Investor.  Nothing in this Agreement, express or implied, is intended to
confer upon any party, other than the parties hereto or their respective
successors and permitted assigns, any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.

7.5.   Additional Shares.  In the event that subsequent to the date of this
       -----------------
Agreement any shares or other securities are issued on, or in exchange for, any
of the securities of the Company owned by a Majority Stockholder by reason of
any stock dividend, stock split, combination of shares, reclassification or the
like, such shares or securities shall be subject to the terms of this Agreement
to the same extent as Majority Stockholder Shares hereunder.

7.6.   Addition of Series A Investors.  Notwithstanding anything to the contrary
       ------------------------------
contained herein, if the Company shall issue additional shares of its Series A
Preferred pursuant to a Series A Subscription Agreement, any purchaser of such
shares of Series A Preferred may become a party to this Agreement by executing
and delivering an additional counterpart signature page to this Agreement and
shall be deemed a "Series A Investor" hereunder.

7.7.   Waiver.  No waivers of any breach of this Agreement extended by any party
       ------
hereto to any other party shall be construed as a waiver of any rights or
remedies of any other party hereto or with respect to any subsequent breach.

7.8.   Governing Law; Submission to Jurisdiction.  This Agreement shall be
       -----------------------------------------
governed by and construed in accordance with the laws of the State of New York
without giving effect to the conflict of laws provisions.  Each of the Series A
Investors and the Majority Stockholders hereby submits to the nonexclusive
jurisdiction of the United States District Court for the Southern District of
New York and of any New York State court sitting in New York City for purposes
of all legal proceedings arising out of or relating to this Agreement and the
transactions contemplated hereby.  Each of the Series A Investors and the
Majority Stockholders irrevocably waives, to the fullest extent permitted by
law, any objection which it may now or hereafter have to the laying of the venue
of any such proceeding brought in such a court and any claim that any such
proceeding brought in such a court has been brought in an inconvenient forum.

7.9.   Counterparts.  This Agreement may be executed in counterparts, each of
       ------------
which shall be deemed an original, and all of which together shall be deemed to
constitute one and the same instrument.

7.10.  Captions and Headings.  The captions and headings used in this Agreement
       ---------------------
are for convenience only and are not to be considered in construing or
interpreting this Agreement.

7.11.  Notices.  Unless otherwise provided, any notice or other communication
       -------
required or permitted to be given or effected under this Agreement shall be in
writing and shall be deemed effective upon personal or facsimile delivery to the
party to be notified or one business day after

                                       5
<PAGE>

deposit with an internationally recognized courier service, delivery fees
prepaid, and addressed to the party to be notified at the following respective
addresses, or at such other addresses as may be designated by written notice:

          If to the Majority
          Stockholders:                       IDT Corporation
                                              190 Main Street
                                              Hackensack, NJ 07601
                                              Attn: Chief Financial Officer
                                              Fax: 201-928-2952

          and:                                Clifford M. Sobel
                                              Net2Phone, Inc.
                                              171 Main Street
                                              Hackensack, NJ 07601
                                              Fax: 201-907-5351

          with a copy to:                     Morrison & Foerster LLP
                                              1290 Avenue of the Americas
                                              New York, NY 10104
                                              Attn: Ira A. Greenstein
                                              Fax: 212-468-7900


          If to the Series A Investors:       At the address specified in
                                              Schedule A

          with a copy to:                     Softbank Technology Ventures, IV
                                              333 West San Carlos St.,
                                              Suite 1225
                                              San Jose, CA 95110
                                              Attn: Gary Rieschel
                                              Fax: 408-271-2270

          with a copy to:                     Cooley Godward LLP
                                              Five Palo Alto Square
                                              3000 El Camino Road
                                              Palo Alto, CA 94306-2155
                                              Attn: Eric Jensen
                                              Fax: 650-857-0663

          and a copy to:                      Paul, Hastings, Janofsky &
                                              Walker LLP
                                              555 South Flower Street
                                              Los Angeles, CA 90071
                                              Attn: Siobhan M. Burke
                                              Fax: 213-627-0705

                                       6
<PAGE>

          and a copy to:                      NBC Multimedia, Inc.
                                              c/o National Broadcasting Company
                                              30 Rockefeller Plaza
                                              New York, New York 10012
                                              Attn: Vice President, Law,
                                              Corporate Transactions Group
                                              Fax: (212) 977-7165

7.12.  Amendments.  This Agreement may not be modified, amended, altered or
       ----------
supplemented, except upon the execution and delivery of a written agreement
executed by the party or parties against which the same will be enforced.
Notwithstanding the foregoing, the consent of a Majority Stockholder who, as of
the date hereof, is an employee or director of, or consultant to, the Company to
any amendment or waiver which diminishes such Majority Stockholder's rights
shall not be required if such person is no longer serving as an employee or
director of, or consultant to the Company.

7.13.  Further Assurances. Each party hereto shall execute and deliver such
       ------------------
additional documents as may be necessary or desirable to consummate the
transactions contemplated by this Agreement.

7.14.  Severability.  If one or more provisions of this Agreement are held to be
       ------------
unenforceable under applicable law, such provisions shall be excluded from this
Agreement and the balance of this Agreement shall be interpreted as if such
provision were so excluded and shall be enforceable in accordance with its
terms.

7.15.  Entire Agreement. This Agreement together with Schedule(s) with the
       ----------------
Series A Subscription Agreement and the Additional Agreements contain the entire
understanding of the parties hereto and thereto with respect to the subject
matter contained herein and therein, and supersede and cancel all prior
agreements, negotiations, correspondence, undertakings and communications of the
parties, oral or written, respecting such subject matter.  There are no
restrictions, promises, representations, warranties, agreements or undertakings
of any party hereto or to the Subscription Agreement or any of the Additional
Agreements with respect to the respect contemplated hereby and thereby, other
than those set forth herein or therein or made hereunder or thereunder.

7.16.  No Fiduciary Duty of Investors.  It is understood and accepted that each
       ------------------------------
of the Series A Investors and their respective affiliates (as defined in Rule
405 of the SEC under the Act) and beneficial owners have or may hereafter have
interests in other business ventures that are or may be competitive with the
activities of the Company and that, to the fullest extent permitted by law,
nothing in this Agreement shall limit the current or future business activities
of each of such Persons whether or not such activities are competitive with
those of the Company or otherwise.  Nothing in this Agreement shall limit in any
manner the ability of the Investors to exercise their rights under this
Agreement or as stockholders or other security holders of the Company and this

                                       7
<PAGE>

Agreement shall not create, or be deemed or interpreted to create, any fiduciary
or similar duty of any party owing to any other party or the Company.

7.17.  Waiver of Jury Trial.  EACH PARTY HERETO HEREBY WAIVES ITS RIGHTS TO A
       --------------------
JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF THIS
AGREEMENT OR THE SUBJECT MATTER HEREOF.  THE SCOPE OF THIS WAIVER IS INTENDED TO
BE ALL-ENCOMPASSING OF ANY AND ALL DISPUTES THAT MAY BE FILED IN ANY COURT AND
THAT RELATE TO THE SUBJECT MATTER OF THIS TRANSACTION, INCLUDING, WITHOUT
LIMITATION, CONTRACT CLAIMS, TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER
COMMON LAW AND STATUTORY CLAIMS.  THIS SECTION 7.17 HAS BEEN FULLY DISCUSSED BY
EACH OF THE PARTIES HERETO AND THESE PROVISIONS SHALL NOT BE SUBJECT TO ANY
EXCEPTIONS.  EACH PARTY HERETO HEREBY FURTHER WARRANTS AND REPRESENTS THAT SUCH
PARTY HAS REVIEWED THIS WAIVER WITH ITS LEGAL COUNSEL, AND THAT SUCH PARTY
KNOWINGLY AND VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING CONSULTATION
WITH LEGAL COUNSEL.  THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE
MODIFIED EITHER ORALLY OR IN WRITING, AND THIS WAIVER SHALL APPLY TO ANY
SUBSEQUENT AMENDMENTS, SUPPLEMENTS OR MODIFICATIONS TO (OR ASSIGNMENTS OF) THIS
AGREEMENT.  IN THE EVENT OF LITIGATION, THIS AGREEMENT MAY BE FILED AS A WRITTEN
CONSENT TO A TRIAL (WITHOUT A JURY) BY THE COURT.

                                       8
<PAGE>

          IN WITNESS WHEREOF, the parties, each by its duly authorized signatory
(if not an individual), have executed this Agreement as of the date first above
written.

                                    SERIES A INVESTOR:


                                    By:____________________________
                                      Name:
                                      Title:

                                    Name:__________________________
                                    Address:_______________________
                                    Title:_________________________
                                    Telephone No.__________________
                                    Fax No.________________________
                                    Date:__________________________


IDT Corporation                     Net2Phone, Inc.


By: /s/ Joyce J. Mason              By: /s/ Howard Balter
    ------------------------            -----------------------------------
    Name: Joyce J. Mason                Name: Howard Balter
    Title: General Counsel              Title: Chief Executive Officer

                                    Scott Sobel Annual Gift Trust
                                    By: a Trustee

    /s/ Clifford M. Sobel            /s/ Stephen Greenberg
    ------------------------         --------------------------------------
    Clifford M. Sobel                   Name: Stephen M. Greenberg, Trustee
<PAGE>

                                   SCHEDULE A
                                   ----------

<TABLE>
<CAPTION>
                                                                        Subscription             Shares of
                        Investor                                           Amount               Preferred A           Warrants
                        --------                                        ------------            -----------           --------
<S>                                                                    <C>                      <C>                   <C>
Softbank Technology Ventures IV, L.P.                                  $14,718,000.00             1,471,800             29,436
Softbank Technology Advisors Fund L.P.                                 $   282,000.00                28,200                564
GE Capital Equity Investments, Inc.                                    $ 7,500,000.00               750,000             15,000
America Online, Inc.                                                   $ 7,500,000.00               750,000             15,000
Hambrecht & Quist Individuals                                          $
               Timothy Baughman                                        $    20,000.00                 2,000                  0
               Daniel Rimer                                            $    20,000.00                 2,000                  0
               David Golden                                            $    15,000.00                 1,500                  0
               Mark Zanoli                                             $    15,000.00                 1,500                  0
               Daniel H. Case III                                      $    10,000.00                 1,000                  0
               Norman Colbert                                          $     5,000.00                   500                  0
Hambrecht & Quist Entities
               Hambrecht & Quist California                            $    78,750.00                 7,875                  0
               Hambrecht & Quist Employee Venture Fund, L.P. II        $    37,500.00                 3,750                  0
               Access Technology Partners, L.P.                        $   790,000.00                79,000                  0
               Access Technology Partners Brokers Fund, L.P.           $     8,750.00                   875                  0
ABS Employee's Venture Fund Limited Partnership                        $   400,000.00                40,000                  0
                                                                       --------------             ---------             ------

               TOTAL                                                   $31,400,000.00             3,140,000             60,000
                                                                       ==============             =========             ======
</TABLE>
<PAGE>

                                  SCHEDULE B
                                  ----------

IDT Corporation  9,288,000 shares
<PAGE>

                                  SCHEDULE C
                                  ----------

Clifford M. Sobel

Scott Sobel Annual Gift Trust
<PAGE>

                                   EXHIBIT A


                             RIGHT OF FIRST REFUSAL
                             ----------------------

1.   If any Series A Investor seeks to make a Disposition pursuant to this
     Agreement, such Series A Investor (the "Offering Holder") shall first make
     a written offer (the "Offer") to sell such shares of Series A Preferred or
     Warrants or Common Stock underlying such securities. The Offer shall set
     forth:
          (i)    the name and address of any proposed transferee;
          (ii)   the number of shares of Series A Preferred or Warrants or
Common Stock underlying such securities to be transferred ("Offered Shares");

          (iii)  if the proposed transfer is a sale, the cash consideration per
share to be received by the Offering Holder in connection with such Disposition
and, if the consideration is other than cash or partly in cash and partly in the
form of other consideration, a statement as to the nature of the other
consideration (with a reasonably sufficient and accurate description thereof)
and the fair and reasonable cash equivalent value (discounted at the prime
commercial rate of interest most recently published by The Wall Street Journal
(the "Prime Rate") to present value) of such other consideration;

          (iv)   the address of the Offering Holder at which each Offeree may
give any notice required herein;

          (v)    an offer to sell and transfer the Offered Shares to the Company
pursuant to the provisions of this Agreement; and

          (vi)   all other terms and conditions of the proposed transfer.

As used herein, the term "Offer Date" shall mean the date on which the Company
actually receives an Offer unless, an independent investment banking firm is
required to determine the fair market value of the Offered Shares, in which
event the "Offer Date" shall be deemed to be the fifth day that is not a
Saturday, Sunday or legal holiday in the State of New York (a "Business Day")
after such investment banking firm shall have notified the Company of its
determination of the value of the Offered Shares.

        The Company shall have the option and preferential right, but shall not
be obligated, for 60 days following the Offer Date to purchase any or all of the
Offered Shares.

2.   If the Company elects to purchase less than all of the Offered Shares
     pursuant to this right of first refusal, the Offering Holder will have the
     right to make a Disposition of the balance Offered Shares to the proposed
     transferee pursuant to the terms of the Offer, and such proposed transferee
     shall execute and become a party to this Agreement and must hold the
<PAGE>

     Offered Shares subject to all the terms and conditions of this Agreement.
     Notwithstanding the failure to execute a counterpart of this Agreement, any
     such proposed transferee shall take such Offered Shares subject to this
     Agreement and by acceptance of any certificate representing such Offered
     Shares shall be bound by this Agreement. If all of the Offered Shares are
     not transferred in accordance with the terms described in the Offer within
     a period of 45 days after the expiration of the option period provided in
     Paragraph (1) hereof, then no Disposition of any Offered Shares may be made
     unless a new Offer covering such Offered Shares is given and this Exhibit A
     is complied with again.

<PAGE>

                                                                   EXHIBIT 10.21

                            [NET2PHONE LETTERHEAD]


                                 May 12, 1999


Clifford M. Sobel
40 Dorrison Drive
Short Hills, New Jersey  07078

Dear Cliff:


     This letter is being entered into in connection with the amendment among
Net2Phone, Inc. ("Net2Phone"), IDT Corporation ("IDT") and you, dated May 11,
1999 (the "Amendment"), to the original employment agreement between you and
IDT, dated May 1, 1997 (the "Agreement"). While the Amendment made Net2Phone a
party to the Agreement, we have asked for you and IDT to execute this letter
agreement to clarify two points with respect to the Amendment and the Agreement.

     1.   It is the intention and desire of the parties to amend Section 8 and
          Section 12 of the Agreement to include Net2Phone within the purview of
          the nondisclosure and non-compete provisions contained therein.
          Therefore, Section 8 and Section 12 of the Agreement are hereby
          amended to include Net2Phone along with the Company (as defined in the
          Agreement) for purposes of your nondisclosure and non-compete
          obligations as set forth in Section 8 and Section 12 of the Agreement.

     2.   This letter shall also clarify that you executed the Amendment in your
          capacity as an individual and not as an officer of Net2Phone.

     Please acknowledge your acceptance to the terms of this letter by executing
below.

                                        Very truly yours,



                                        Howard S. Balter
                                        Chief Executive Officer


AGREED TO AND ACCEPTED:
                                              IDT CORPORATION


/s/ Clifford M. Sobel                        By: /s/ Joyce Mason
- --------------------------------                ------------------------------
Clifford M. Sobel                               Name: Joyce Mason
                                                Title: General Counsel

<PAGE>

                                                                   EXHIBIT 10.22

                                Net2Phone, Inc.
                                171 Main Street
                         Hackensack, New Jersey  07601


                                 May 17, 1999



Clifford M. Sobel
40 Dorrison Drive
Short Hills, New Jersey  07078

Dear Cliff:

     This letter agreement is being entered into in connection with your
agreement to retain your common stock (the "Common Stock") of Net2Phone, Inc.
("Net2Phone"), in lieu of becoming a holder of Net2Phone class A common stock
(the "Class A Stock").

     In consideration of your agreement not to participate in the Net2Phone
recapitalization pursuant to which IDT Corporation ("IDT") became a holder of
Class A Stock, Net2Phone and IDT have agreed to provide you with certain
piggyback registration rights relating to the shares of Common Stock you hold
today and undertaking to ensure that you remain Chairman of Net2Phone for a
period of three years, both as provided herein.

     1.  Net2Phone hereby grants you "piggy-back" registration rights relating
         to the shares of Common Stock you hold today under the same terms and
         conditions as those rights granted to Net2Phone's Series A Preferred
         stockholders as set forth in the Series A Preferred Shareholder
         Registration Rights Agreement, dated as of May 13, 1999, among
         Net2Phone and each of the investors listed on Schedule A thereto (the
         "Agreement"); provided, however, that you agree to be subject to the
         allocation provisions contained in Section 2.7 of the Agreement.

     2.  IDT agrees that upon a Qualifying Public Offering (as defined in the
         Agreement), IDT shall vote its Class A Stock or Common Stock, as the
         case may be, provided that you remain in compliance with the terms of
         your employment agreement, to elect you to that class of directors of
         Net2Phone's staggered board whose term expires three years from the
         date of election.

     3.  If no Qualifying Public Offering occurs, IDT agrees to vote its Class A
         Stock or Common Stock, as the case may be, to re-elect you Chairman of
         the firm at each of the next two annual stockholder meetings.

     4.  To clarify the rights and obligations of the parties, upon the
         occurrence of a Qualifying Public Offering, IDT shall be released from
         any obligations to pay to you any amount of salary or other benefits
         payable pursuant to your employment agreement, as amended, and
         Net2Phone shall be solely obligated as to such payments.
<PAGE>

                                Net2Phone, Inc.

Clifford Sobel
May 17, 1999
Page Two

     Please acknowledge your acceptance to the terms of this letter by executing
below.

                              Very truly yours,

                              /s/ Howard Balter

                              Howard S. Balter
                              Chief Executive Officer


AGREED TO AND ACCEPTED:


/s/ Clifford M. Sobel
- --------------------------------------
Clifford M. Sobel

IDT CORPORATION

By: /s/ Joyce Mason
   -----------------------------------
Name: Joyce Mason
Title: General Counsel

<PAGE>

                                                                   EXHIBIT 10.23

                     CO-LOCATION AND FACILITIES MANAGEMENT
                              SERVICES AGREEMENT

     This Co-location and Facilities Management Services Agreement (this
"Agreement") is made effective as of the 20th day of May, 1999 by and between
IDT Corporation, a Delaware corporation having an office at 225 Old New
Brunswick Road, Piscataway, NJ and Net2Phone, Inc., a Delaware corporation
having an office at 171 Main Street, Hackensack, NJ.

     WHEREAS, IDT has entered into an agreement with 225 Old NB Road, Inc.
("Landlord") pursuant to which IDT uses and occupies approximately 22,000 square
feet of space (the "Premises") located within that certain building located at
225 Old New Brunswick Road, Piscataway, New Jersey ("Building"); and,

     WHEREAS, IDT desires to license to Net2Phone, and Net2Phone desires to
license from IDT, the right to use and occupy space within the Premises (the
"Equipment Space") as shown on Exhibit B attached to and made a part hereof to
locate certain internet telephony equipment (the "Equipment"); and

     WHEREAS, IDT has agreed to provide, and Net2Phone desires to receive, co-
location and facilities management services based upon the terms and conditions
set forth herein.

     NOW THEREFORE, in consideration of the mutual covenants and agreements
hereinafter set forth, and in consideration of the foregoing recitals, each of
which is incorporated in and made a part of this Agreement, the parties hereto,
intending to be legally bound, hereby agree as follows:

1.   PERMISSIBLE USE

     IDT hereby licenses the Equipment Space to Net2Phone, and Net2Phone hereby
licenses the Equipment space from IDT upon and subject to the terms, covenants,
rentals and conditions herein set forth for the purpose of locating internet
telephony equipment therein.

2.   UTILITIES AND TECHNICAL UNDERTAKINGS

     IDT shall at all times during the Term of this Agreement maintain or cause
the maintenance of the back-up generator, electrical system and equipment and
heating, ventilating and air-conditioning system and equipment (collectively,
"Utility Systems") serving the Equipment Space in good condition and repair,
adequate at all times to provide, without interruption, all of the Services
described in this Agreement.

     IDT currently employs technical staff to maintain and manage technical
facilities.  Upon Net2Phone's request, IDT's technical staff shall perform
necessary technical work related specifically to Net2Phone owned or leased
equipment and/or provide technical services to Net2Phone's facilities on a "time
and material" basis as set forth in Exhibit A.
<PAGE>

Such work and or services will be performed only at Net2Phone's written request
(including via email) and under Net2Phone's direction.

3.   ADDITIONAL TERMS GOVERNING THE USE OF THE EQUIPMENT SPACE; INSTALLATION OF
     EQUIPMENT

     a.  Net2Phone shall not make any construction changes or material
         alterations to the interior or exterior portions of the Equipment Space
         or Premises, including building of walls or partitions, drop ceilings,
         lighting, hvac, plumbing or any electrical distribution or power
         supplies for equipment. IDT shall exclusively perform and manage any
         construction or material alterations within the Equipment Space and
         Premises at rates to be negotiated between the parties hereto, which
         rates shall not exceed the generally prevailing market rate that is
         then being charged to perform such services.

     b.  Net2Phone's use of the Equipment Space, installation of Equipment, and
         access to the Premises shall at all times be subject to Net2Phone's
         adherence to generally accepted industry standards for facility
         security and rules of conduct provided, however, Net2Phone shall be
         permitted to use the Equipment Space and shall have access through the
         Premises to the Equipment Space, twenty-four (24) hours per day, three
         hundred sixty-five (365) days per year.

     c.  Net2Phone shall not market, license or sell co-location services in the
         Equipment Space to any third party such that Net2Phone is using the
         Equipment Space to compete with IDT, except that Net2Phone is
         permitted, subject to IDT's prior written consent, to allow its vendors
         and customers to co-locate within the Equipment Space if such co-
         location is needed for purposes of permitting the vendor or customer to
         connect to Net2Phone's network. However, Net2Phone may not market,
         license or sell co-location services in the Equipment Space to other
         local, inter-exchange, long distance carriers, or Internet service
         providers, or other such service providers or carriers for the purpose
         of such carriers or service providers utilizing the Premises or the
         Building as a point of presence from which the service provider or
         carrier would provision interconnect services to other users within the
         Premises or the Building. If Net2Phone should provide or attempt to
         make available to any third party use of the Equipment Space without
         obtaining the prior written consent of IDT, Net2Phone shall be in
         breach of this Agreement and IDT may pursue any legal or equitable
         remedy it is entitled to pursue under Paragraph 9 of this Agreement.

4.   PAYMENT

     a.  Net2Phone shall pay IDT a monthly recurring fee for use and occupancy
         of the Equipment Space (the "Occupancy Fee") as set forth in the
         attached

                                       2
<PAGE>

         Exhibit A. If Net2Phone requests that IDT provide services not
         delineated herein or in Exhibit A, Net2Phone agrees to pay IDT's then
         current standard charge for such service in effect at the time such
         service was rendered or such charge as the parties may mutually agree
         upon prior to the delivery of the service.

     b.  Commencing on the Commencement Date, monthly installments of the
         Occupancy Fee shall be payable in advance on the first day of each
         calendar month.

     c.  Both IDT and Net2Phone agree to reimburse the other for all reasonable
         repair or restoration costs associated with damage or destruction
         caused by their own personnel, agents, suppliers, contractors or
         visitors or as a consequence of any removal of Equipment or other
         property installed in the Equipment Space or the Premises. Such
         reimbursement shall be made within thirty (30) days of the damage or
         destruction.

     d.  The monthly charges for all services used shall be payable in U.S.
         dollars within thirty (30) days from the date of IDT's invoice. Payment
         shall be remitted to IDT at the address set forth in Paragraph 13 and
         will not be deemed to have been made until the funds are received by
         IDT.

     e.  Any payment (including monthly service charges due under this Paragraph
         or any other amount due hereunder) not made when due will be subject to
         a late charge or one and one-half percent (1.5%) per month.

5.   HOURLY RATES FOR ADDITIONAL SERVICES

     When IDT technical support assistance is requested by Net2Phone for
resolution or coordination of problems, Net2Phone agrees to pay IDT a per hour
rate set forth in Exhibit A.  IDT will inform Net2Phone in advance, if any
services to be performed by IDT for Net2Phone are billable and IDT will provide
Net2Phone with a reasonable estimate prior to performance of the services.  For
any services that it may require, Net2Phone shall contact IDT customer service
as specified in Paragraph 13.

6.   INTERCONNECT SERVICES

     a.  IDT shall arrange for all interconnection facilities within the
         Premises. All interconnection facilities arranged by IDT shall be
         provisioned solely to the Net2Phone occupied Equipment Space within the
         Premises. All costs and arrangements for local interconnects will be
         Net2Phone's responsibility, unless otherwise agreed to by the parties
         in writing. When Net2Phone utilizes IDT's services under this Paragraph
         6(a), Net2Phone's facilities management personnel must coordinate with
         IDT in the exchange of technical information relating to their
         requirements for local interconnect in order for IDT to provide the
         necessary support to Net2Phone with the provisioning and installation
         of the interconnect

                                       3
<PAGE>

         facilities. In addition, for all services to be provided by IDT under
         this Paragraph 6(a), Net2Phone agrees to provide IDT notice at least
         ten (10) days prior to the commencement date of the services.
         Coordination regarding exchange of technical information relating to
         local interconnects shall be provided to IDT as specified in Paragraph
         13.

     b.  Upon Net2Phone's written request, IDT shall, on an as required basis,
         provide cross-connect services to Net2Phone to allow Net2Phone to
         interconnect with the various local exchange and competitive access
         providers that are located within the meet-me area of the Premises. In
         such event, IDT shall invoice and Net2Phone shall pay to IDT the
         Dispatch Labor Charges as specified in Exhibit A.

     c.  Upon Net2Phone's written request, IDT shall, on an as required basis,
         act as Net2Phone's agent in the turning-up of local interconnects and
         to provide on-going loop maintenance between the Premises and any
         third-party facilities of Net2Phone's customers. In such event, IDT
         shall invoice and Net2Phone shall pay to IDT the Dispatch Labor Charges
         as specified in Exhibit A.

     d.  All interconnects must be at the OC3, STM-1, DS3, or DS1 level
         utilizing up to 28 T1's per DS3, 24 ports per DS1. The interface point
         for IDT's service will be IDT's DSX "CROSS-CONNECT" panel.

7.   FORCE MAJEURE

     Neither party shall be liable for any failure or delay in performance to
the extent caused by causes beyond its reasonable control, including, without
limitation, labor disputes, fires or other casualties, weather or natural
disasters, damage to facilities, or the conduct of third parties ("Force
Majeure").

8.   EMERGENCIES AND INTERRUPTIONS

     a.  In case of an interruption or failure of any of the services furnished
         hereunder, including but not limited to power, back-up power, hvac,
         transmission and internet services (the "Services"), IDT shall use
         commercially reasonable efforts to restore service as soon as possible.
         If IDT elects, it may substitute a reasonably equivalent service. IDT's
         liability for all mistakes, errors, omissions, interruptions, delays or
         defects in Services occurring in the course of engineering,
         installation and operation of its system or the provision of Services
         shall in no event exceed the charges paid by Net2Phone for the Services
         during the two months preceding the outage. In no event shall IDT be
         liable for any special, consequential or incidental damages.

     b.  In the event Net2Phone experiences an interruption of power services
         for any cause within IDT's control, which results in the loss of
         Net2Phone's

                                       4
<PAGE>

         service for a period of twenty-four (24) hours or more in any single
         event or for more than ninety-six (96) hours in any consecutive six (6)
         month period, or if IDT fails to promptly commence or diligently pursue
         restoration of any interrupted power services, Net2Phone shall have the
         right to terminate this Agreement upon ten (10) days notice to IDT.

     c.  In the event Net2Phone experiences an interruption of back-up power
         which is the direct result of IDT's Landlord's negligence or willful
         misconduct, IDT shall pay to Net2Phone, it's proportionate share (based
         upon the ratio of the gross area of the Equipment Space to the gross
         area of the Premises) of any damages collected by IDT from its Landlord
         for such interruption of back-up power.

     d.  IDT shall at all times during the term of this Agreement maintain a
         required operating temperature of 65-87 degrees Fahrenheit. In the
         event Net2Phone experiences an interruption of hvac services for any
         cause within IDT's control, which lasts for more than one (1) day, the
         Occupancy Fee shall be abated from the second day until the date on
         which such hvac services are restored, and if such hvac services are
         not restored within ten (10) days, or if IDT fails to promptly commence
         or diligently pursue restoration of the interrupted hvac services,
         Net2Phone shall have the right to terminate this Agreement upon ten
         (10) days notice to IDT.

     e.  In the event Net2Phone experiences an interruption of transmission
         services for reasons other than Force Majeure which results in the loss
         of Net2Phone's service for a period of seventy-two (72) hours or more
         in any single event or for more than one hundred sixty-eight (168)
         hours in any consecutive six (6) month period, Net2Phone shall have the
         right to terminate this Agreement upon ten (10) days notice to IDT.

9.   DEFAULT.

     a.  Either party shall be in default if it fails to timely perform its
         material obligations under this Agreement or becomes the subject of any
         voluntary proceedings under any bankruptcy or insolvency laws, or
         becomes the subject of any involuntary proceedings under any bankruptcy
         or involvency laws which are not dismissed or withdrawn within sixty
         (60) days after the filing thereof. Upon such default by a party (other
         than a service interruption as described in Paragraph 9 hereof), the
         other party shall provide written notice to the defaulting party within
         ten (10) days of such default, allowing thirty (30) days for the
         default to be cured. If the default is not cured within that thirty
         (30) days, the non-defaulting party may, upon ten (10) days notice to
         the other, terminate this Agreement, and pursue all other available
         remedies at law and in equity, all of which shall be cumulative.

                                       5
<PAGE>

     b.  If this Agreement or any addendum is terminated by IDT during the Term
         as a result of Net2Phone's material default or is terminated by
         Net2Phone in the absence of a material default hereunder by IDT (in
         either case, an "Net2Phone Termination"), Net2Phone shall be liable to
         IDT for liquidated damages (due to the difficulty in projecting and
         establishing actual damages) for the terminated Services, as provided
         for below:

         i.   If a Net2Phone Termination occurs within twenty-four (24) months
              from the Commencement Date, then, Net2Phone shall pay to IDT forty
              (40%) percent of the monthly Occupancy and related Fees for the
              remainder of the Term.

         ii.  If a Net2Phone Termination occurs after twenty-four (24) months
              but prior to forty-eight (48) months from the Commencement Date,
              then, Net2Phone shall pay to IDT twenty (20%) percent of the
              monthly Occupancy and related Fees for the remainder of the Term.

         iii. If a Net2Phone Termination occurs after forty-eight (48) months
              but prior to sixty (60) months from the Commencement Date, then
              Net2Phone shall pay to IDT ten (10%) percent of the monthly
              Occupancy and related Fees for the remainder of the Term.

     c.  Only in the event of a Net2Phone default and subsequent to an IDT
         termination of the Services for cause, the parties shall agree upon the
         amount of any reconnect charges, increase in service rates and/or
         security deposit required hereunder, prior to any reinstatement of the
         Services by IDT; it being understood, however, that in the event of a
         termination by IDT for cause, IDT may sell the Services to others.

     d.  Upon termination or expiration of the Term of this Agreement, Net2Phone
         agrees to remove the Equipment and other property which was installed
         by Net2Phone or Net2Phone's agents. Net2Phone shall promptly reimburse
         IDT for all costs associated with the repair and restoration of the
         Equipment Space, the Premises and the Building affected by the removal
         of such Equipment. In the event such Equipment or property has not been
         removed within fifteen (15) days following the effective termination or
         expiration date, IDT shall have the right to remove, relocate, or
         otherwise store such Equipment or property at Net2Phone's expense.

10.  TERM OF THIS AGREEMENT

     The term (the "Term") of this Agreement shall be for a period of three (3)
years commencing on the effective date of this Agreement (the "Commencement
Date").  After the expiration of such three (3) year period, this Agreement
shall remain in force on a month to month basis until terminated by either party
upon thirty (30) days written notice.

                                       6
<PAGE>

11.  APPROVALS

     Net2Phone shall be responsible to obtain and maintain all approvals and
permits necessary for Net2Phone's use of the Equipment Space.

12.  INDEMNIFICATION

     The parties shall indemnify each other against all losses, claims damages,
expenses and liabilities (including reasonable attorneys' fees and court costs)
to extent caused by a willful or negligent act or omission of such party.

13.  NOTICES AND OTHER COMMUNICATIONS

     a.  Documentation and coordination regarding exchange of technical
         information relating to local interconnects, and notification for
         assistance, resolution or coordination of service, and other notices
         under this Agreement shall be sent to:

         If to IDT:

         Kathy Timko
         IDT Corporation
         225 Old New Brunswick Road
         Piscataway, New Jersey

         And if of a legal nature:

         Copy to:

         IDT Legal Department
         190 Main Street
         Hackensack, New Jersey

         If to Net2Phone:

         Gary Lundner
         Net2Phone, Inc.
         171 Main Street
         Hackensack, New Jersey

         And if of a legal nature:

         Copy to:

         Net2Phone Legal Department
         171 Main Street
         Hackensack, New Jersey

                                       7
<PAGE>

14.  INSURANCE

     a.  Net2Phone agrees to maintain, at Net2Phone's expense, during the entire
         time this Agreement is in effect for the Premises (i) Comprehensive
         General Liability Insurance in an amount not less than one million
         dollars ($1,000,000.00) per occurrence for bodily injury or property
         damage, (ii) Employer's Liability in an amount not less than one
         million dollars ($1,000,000.00) per occurrence, (iii) Worker's
         Compensation in an amount not less than that prescribed by statutory
         limits, and (iv) adequate insurance coverage to protect Net2Phone owned
         Equipment and property installed within the Equipment Space. Under no
         circumstances shall IDT be obligated to provide insurance coverage for
         any Net2Phone owned Equipment or property installed within the IDT
         Premises. However, Net2Phone may satisfy the foregoing insurance
         obligations under the existing policies of insurance of IDT, at IDT's
         discretion, so long as Net2Phone qualifies as a subsidiary of IDT as
         defined in such policies of insurance; in which event, Net2Phone shall
         be responsible for the Net2Phone portion of the cost to IDT of such
         insurance. Net2Phone shall furnish IDT with certificates of insurance
         which evidence the minimum levels of insurance set forth herein and
         which, if not an IDT policy, name IDT as an additional insured upon
         request by IDT.

     b.  IDT agrees to maintain, at IDT's expense, during the entire time this
         Agreement is in effect (i) Comprehensive General Liability Insurance in
         an amount not less than one million dollars ($1,000,000.00) per
         occurrence for bodily injury or property damage, (ii) Employer's
         Liability in an amount not less than Five Hundred Thousand Dollars
         ($500,000.00) per occurrence, and (iii) Worker's Compensation in an
         amount not less than that prescribed by statutory limits. IDT shall
         furnish Net2Phone with certificates of insurance which evidence the
         minimum levels of insurance set forth herein upon request.

15.  MISCELLANEOUS

     a.  This Agreement may not be assigned by either party in whole or in part
         without the prior written consent of the other party, which consent
         shall not be unreasonably withheld, except that Net2Phone and IDT shall
         have the right to assign this Agreement to an affiliate or division,
         provided that IDT or Net2Phone exercise management control over and/or
         own a controlling interest in or are under common control with such
         affiliate or division. Notwithstanding the foregoing restriction on the
         assignment of this Agreement, (i) any direct or indirect transfer of
         the share capital of IDT or Net2Phone shall not be considered an
         assignment of this Agreement, and (ii) both IDT and Net2Phone shall
         have the unrestricted right to assign its rights and obligations under
         this Agreement to any individual, corporation or other business entity
         which acquires all or substantially all of its shares or assets and
         upon such assignment, the

                                       8
<PAGE>

         assigning party shall be released of all of its obligations under this
         Agreement arising from and after the date of such assignment.

     b.  The terms and provisions of this Agreement may only be waived, modified
         or changed by an amendment in writing signed by both parties hereto. No
         failure by either party to insist upon the other's performance of any
         obligation hereunder shall constitute a waiver of the obligation unless
         in writing.

     c.  If any provision of this Agreement shall be determined to be invalid or
         unenforceable, the remainder of the Agreement shall continue in full
         force and effect.

     d.  This Agreement and the rights and obligations of the parties hereto
         shall be governed in all respects by the laws of the State of New
         Jersey (without regard to the principles of conflicts of laws). Each
         party shall comply with all applicable federal, state and local laws.
         The parties hereby solely subject themselves to the jurisdiction of the
         State of New Jersey, for the resolution of any dispute arising
         hereunder and agree that venue in any suit filed in those courts shall
         be proper.

     e.  This Agreement may be executed in two or more counterparts, each of
         which shall be an original, and all of which, taken together, shall
         constitute one and the same Agreement.

     f.  Both IDT and Net2Phone each represent and warrant to the other that the
         person executing this Agreement (or any amendments and changes) on its
         behalf is its duly authorized representative.

     g.  Net2Phone covenants and represents that it has negotiated this
         Agreement directly with IDT, and has not acted by implication or
         otherwise to authorize or authorized any other broker, salesman, or
         finder to act for it in the negotiation and execution of this Agreement
         and agrees to defend, indemnify and hold harmless IDT from any and all
         claims by any such broker, salesman or finder for a commission or
         finder's fee as a result of Net2Phone having entered into this
         Agreement.

     h.  This Agreement and any documents attached hereto constitute the entire
         Agreement between the parties and supersede all prior agreements,
         whether written or oral, with respect to the subject matter contained
         herein. In case of any conflict between this Agreement and the terms of
         any documents attached hereto, the terms of the documents attached
         shall control insofar as the services covered thereby are concerned.

                                       9
<PAGE>

     IN WITNESS WHEREOF, the undersigned hereby acknowledges that they have read
and fully understand the foregoing Agreement and, further, that they agree to
each of the terms and conditions contained herein.

Agreed and Accepted:
Net2Phone, Inc.

By: /s/ David Greenblatt                Print: David Greenblatt
    -----------------------------              ---------------------------------

Date: 5/20/99                           Title: Chief Operating Officer
      ---------------------------              ---------------------------------



Agreed and Accepted:
IDT Corporation

By: /s/ Joyce Mason                     Print: Joyce Mason
    -----------------------------              ---------------------------------

Date: 5/20/99                           Title: Senior Vice Presdient & Secretary
      ---------------------------              ---------------------------------

                                       10
<PAGE>

                               Exhibit A- RATES

CO-LOCATION AND FACILITIES MANAGEMENT SERVICE AGREEMENT

CLIENT:  Net2Phone

1.  Address of Co-location Center:  225 Old New Brunswick Road, Piscataway, NJ
    -----------------------------

2.  Initial Space Allocation:  14 racks.
    ------------------------

3.  Initial Term: Years (3) years.
    -------------

4.  Monthly Recurring Occupancy Fees:  $600 per month, per rack
    ---------------------------------

5.  Additional Occupancy Fees:  Payable at the times and in the amounts as
    --------------------------
    agreed by Net2Phone and IDT when additional services are requested by
    Net2Phone.

6.  Dispatch Labor Charges:  The following charges apply to work done on
    -----------------------
    Net2Phone's behalf on Net2Phone equipment located in the Equipment space
    ("Dispatch Labor Charges").

         a.  Normal IDT business hours (Mon. - Fri. 8:00 a.m. to 5:00 p.m.
             except IDT holidays) will be billed to Net2Phone at the rate of
             $75.00 per hour with a one (1) hour minimum.

         b.  Off-hour support shall be billed at a rate of $125.00 per hours
             with a two (2) hour minimum (All other times and IDT holidays).

         c.  Dispatch Labor Charges apply only if Net2Phone's requests and
             authorizes dispatch of IDT personnel to perform work on Net2Phone's
             behalf. IDT reserves the right to accept or reject any such
             requests. IDT dispatch of personnel to work on Net2Phone's
             equipment is also premised on Net2Phone furnishing instruction to
             IDT prior to commencement of any work.

7.  Additional space within the Premises:  Additional space made available to
    -------------------------------------
    Net2Phone by IDT will be provided to Net2Phone according to the terms,
    conditions and rates in force at the time of the Net2Phone request.

                                       11

<PAGE>

                                                                   EXHIBIT 10.24

                            Form of Loan Agreement

      Loan Agreement, dated as of May 17, 1999 (the "Agreement"), between
Net2Phone, Inc., a Delaware corporation (the "Company"), and the borrower whose
name appears on the signature page hereof ("Borrower").  Capitalized terms used
herein without definition have the meanings assigned to such terms in the Stock
Option Agreement, dated as of May 17, 1999, by and between the Company and
Borrower (the "Option Agreement").

      WHEREAS, Borrower intends to exercise the portion of his Options which are
vested and exercisable as of the date hereof, pursuant to the terms of the
Option Agreement; and

      WHEREAS, the Company wishes to loan to Borrower the amount necessary to
pay the exercise price for such Options (the "Option Price");

      NOW THEREFORE the parties hereto agree as follows:

1.    Loan; Cancellation of Options.
      -----------------------------

   a. The Company hereby agrees to make available to Borrower a loan in lawful
money of the United States in the principal amount of

                                    $______

(the "Principal Amount") on the terms of this agreement (the "Loan").

   b. As a condition to the making of the Loan, the Borrower agrees that ____ of
the Options that are vested on the date hereof pursuant to the terms of the
Option Agreement shall be deemed to be cancelled, and shall no longer be deemed
to be outstanding.

2.    Repayment of Principal.
      ----------------------

      The entire Principal Amount, or if lesser, the then unpaid principal
balance outstanding under this Agreement, shall be due and payable by Borrower
on May 16, 2001 (the "Normal Repayment Date"), together with all unpaid accrued
interest and other charges due hereunder, unless earlier due and payable by
reason of the acceleration of the maturity of the Principal Amount due hereunder
pursuant to the terms of this Agreement.
<PAGE>

3.    Interest.
      --------

      Borrower agrees to pay interest on the unpaid principal outstanding under
this Agreement, which interest payments shall be due and payable annually in
arrears commencing December 31, 1999 and continuing on the last day of each and
every December thereafter at a rate per annum equal to 7.0% compounded annually,
the mid-term applicable Federal rate (compounded annually) as of the date hereof
(the "Interest Rate").

      If any payment which is to be made hereunder by Borrower is not paid when
due, such payment shall, from and after the day that is five days following the
applicable payment date, bear interest payable on demand at a rate per annum
equal to the Interest Rate plus 2 percent (2%), but not to exceed the maximum
amount permitted by law.

      If the payment date for the payment of principal or interest under this
Agreement falls on a Saturday, Sunday or a day on which the offices of the
Company are closed, then such payment date shall be extended to the next
succeeding business day, and interest on such payment shall be payable at the
Interest Rate during such extension.

4.    Use of Funds.
      ------------

      Borrower covenants and agrees that the funds advanced pursuant to this
Agreement shall be used solely to finance Borrower's payment of the Option
Price.  As a consequence, Borrower hereby instructs the Company to disburse the
Loan by transferring the Principal Amount back to the Company in payment of
Borrower's Option Price.

5.    Voluntary Prepayments.
      ---------------------

      The Loan may be prepaid in whole or in part at any time without premium or
penalty, but with interest on the amount being prepaid through the date of
prepayment, with written notice to the Company received two (2) business days
prior to the date of such prepayment specifying the amount of prepayment.

6.    Mandatory Prepayment in connection with Distribution of Deferral Account.
      ------------------------------------------------------------------------

      Borrower shall prepay, within 90 days after the termination of Borrower's
employment with the Company, the entire Principal Amount, together with all
unpaid accrued interest and other charges properly incurred by the Company
pursuant to Section
<PAGE>

8 of this Agreement; provided however that no such prepayment shall be required
                     ----------------
in the event that Borrower is employed by an affiliate of the Company
immediately following his termination of employment with the Company.

7.    Defaults.
      --------

      If either of the following events shall occur:  (a) a default by Borrower
in the payment of any of the obligations or liabilities of Borrower to the
Company hereunder which default is not cured within 10 days following delivery
by the Company of notice thereof to Borrower or (b) Borrower shall admit in
writing that he is unable to pay his debts as such debts become due, then, at
the option of the Company, all obligations of Borrower under this Agreement
shall become due and payable forthwith, upon delivery by the Company of notice
to Borrower to that effect, anything contained herein or in any other document,
instrument or agreement to the contrary notwithstanding.  All obligations of
Borrower under this Agreement shall become immediately and automatically due and
payable, without presentment, demand, protest or notice of any kind, upon the
commencement by or against Borrower of a case or proceeding under any
bankruptcy, insolvency or other law relating to the relief of debtors, which
case or proceeding is not discharged or bonded within 30 days.

8.    Costs.
      -----

      Borrower agrees to pay on demand all reasonable costs and expenses
incurred by the Company incidental to or in any way relating to the Company's
enforcement of the obligations of Borrower hereunder or the preservation or
protection of the Company's rights in connection herewith, including, but not
limited to, reasonable attorneys' fees and expenses.

9.    Governing Law; Jurisdiction.
      ---------------------------

      The provisions of this Agreement shall be construed and interpreted and
all rights and obligations hereunder shall be determined in accordance with the
laws of the State of Delaware without reference to principles of conflicts or
choice of law under which the law of any other jurisdiction would apply, and the
courts located in that state shall have exclusive jurisdiction of all disputes
rising hereunder.

10.   Advice of Counsel.
      -----------------
<PAGE>

      Borrower acknowledges having had the opportunity to obtain the advice of
counsel of his own choosing in entering into this Agreement and the transactions
contemplated hereby.  Borrower is fully aware of the contents of this Agreement
and its legal effect and is entering into this Agreement without threat,
coercion, fraud or duress of any kind.  Borrower is not relying on any
representation, statement, or warranty of any party regarding this Agreement or
the transactions contemplated hereby.

11.   Counter-Claims, Set-Off.
      -----------------------

      Borrower waives the right to interpose any counter-claim and the right of
set-off of any kind relating to the claims of the Company under this Agreement
or the transactions contemplated hereby.

12.   Assignment.
      ----------

      The obligations or rights of the Company hereunder shall be assignable or
transferable in full or in part by the Company without the consent of, but upon
prior notice to, Borrower.  No obligation or rights of Borrower hereunder can be
assigned or transferred without the prior written consent of the Company.

13.   No Waiver, Cumulative Remedies.
      ------------------------------

      No failure on the part of the Company to exercise, and no delay in
exercising, any right, remedy or power hereunder shall operate as waiver
thereof, nor shall any single or partial exercise by the Company of any right,
remedy or power hereunder preclude any other or future exercises of any other
right, remedy or power.

      Each and every right, remedy and power hereby granted to the Company shall
be cumulative and not exclusive of any other such right, remedy or power, and
may be exercised by the Company from time to time.

14.   Severability.
      ------------

      Every provision of this Agreement, other than the set-off provisions
hereof, is intended to be severable; if any term or provision of this Agreement
shall be invalid, illegal or unenforceable for any reason whatsoever, the
validity, legality and enforceability of the remaining provisions hereof shall
not in any way be affected or impaired.
<PAGE>

15.   Notices.
      -------

      Any notice required or desired to be delivered under this Agreement shall
be in writing and shall be delivered personally, by courier service, by
registered mail, return receipt requested, or by telecopy and shall be effective
upon actual receipt by the party to which such notice shall be directed, and
shall be addressed as follows (or to such other address as the party entitled to
notice shall hereafter designate in accordance with the terms hereof):

      If to the Company:

         Net2Phone, Inc.
         171 Main Street
         Hackensack, NJ  07601
         Attention:  General Counsel

      If to Borrower, to him at the address set forth on the signature page
hereof.

16.   Headings.
      --------

      The section headings in this Agreement are for convenience only and are
not intended to affect the interpretation or construction of the provisions of
this Agreement.

17.   Amendments.
      ----------

      This Agreement may not be altered, modified or amended except by a written
instrument signed by each of the parties hereto.

18.   Counterparts.
      ------------

      This Agreement may be executed in counterparts, each of which shall be
deemed an original but all of which shall constitute one and the same
instrument.
<PAGE>

      IN WITNESS WHEREOF, the Company has caused this Agreement to be executed
by its duly authorized officer and Borrower has hereunto set his hand as of the
day and year first above written.


                           NET2PHONE, INC.


                           By:______________________________
                              Name:
                              Title:



                           BORROWER


                           _________________________________
                           Name:
                           Address:

<PAGE>


                                                                   EXHIBIT 10.25

                                    Form of
                                NET2PHONE, INC.
                            STOCK OPTION AGREEMENT

     This STOCK OPTION AGREEMENT is entered into on May 17, 1999, by and between
Net2Phone, Inc., a Delaware corporation (the "Company"), and _____________ (the
"Employee").

     WHEREAS, the Company has adopted the Net2Phone, Inc. 1999 Stock Option and
Incentive Plan (the "Plan"); and

     WHEREAS, the company desires to grant to the Employee options under the
Plan to acquire an aggregate of _________ shares of common stock of the Company,
par value $.01 per share (the "Stock"), on the terms set forth herein and in the
Plan.

     NOW, THEREFORE, the parties hereby agree as follows:

     1.  Definitions.  Capitalized terms not otherwise defined herein shall
         -----------
have the meanings set forth in the Plan.

     2.  Grant of Options.  The Employee is hereby granted [Incentive Stock
         ----------------
Options] [Nonqualified Stock Options] (the "Options") to purchase an aggregate
of __________ shares of Stock, pursuant to the terms of this Agreement and the
provisions of the Plan.

     3.  Term.  The term of the Options (the "Option Term") shall be for ten
         ----
(10) years from the date of this Agreement.

     4.  Option Price.  The initial exercise price per share of the Options
         ------------
shall be $_____, subject to adjustment as provided in the Plan.

     5.  Conditions to Exercisability.  The Options shall become vested and
         ----------------------------
exercisable ____% immediately, ____% on the 1st anniversary, ____% on the 2nd
anniversary and ____% on the third anniversary of the date of this Agreement if
the Employee continues to be in the employ of, or maintains a director or
consultant relationship with, the Company or any Related Entity.  The terms and
conditions set forth in the Plan, including, without limitation, the provisions
relating to the termination of Employee's employment or other relationship with
the Company or a Related Entity, are hereby incorporated by reference in this
Agreement.

     6.  Withholding Taxes.  No later than the date on any Tax Event, the
         -----------------
Employee will pay to the Company or make arrangements satisfactory to the
Committee regarding payment of any federal, state or local taxes of any kind
required by law to be withheld upon the Tax Event. Alternatively, solely to the
extent permitted or required by law, the Company may deduct the amount of any
federal, state or local taxes of any kind required by law to be withheld upon
the Tax Event from any payment of any kind due to the Employee. The withholding
obligation may be satisfied by the withholding or delivery of Common Stock.
<PAGE>

     7.  Corporate Transaction; Change in Control; Related Entity Disposition.
         --------------------------------------------------------------------

         (a)  Corporate Transaction.  In the event of a Corporate Transaction
              ---------------------
occurring after the Company's Initial Public Offering, each of the Options
covered by this Agreement shall automatically become fully vested and
exercisable immediately prior to the specified effective date of such Corporate
Transaction. Effective upon the consummation of the Corporate Transaction, all
of the Options covered by this Agreement that have not been exercised shall
terminate. However, all such awards shall not terminate if the Options are, in
connection with the Corporate Transaction, assumed by the successor corporation
or Parent thereof.

         (b)  Change In Control.  In the event of a Change in Control (other
              -----------------
than a Change in Control which is also a Corporate Transaction) occurring after
the Company's Initial Public Offering, each of the Options covered by this
Agreement which is at the time outstanding automatically shall become fully
vested and exercisable, immediately prior to the specified effective date of
such Change in Control.

         (c)  Related Entity Disposition.  The Continuous Service of the
              --------------------------
Employee (if the Employee is primarily engaged in service to a Related Entity at
the time that the Company is involved in a Related Entity Disposition occurring
after the Company's Initial Public Offering) shall terminate effective upon the
consummation of such Related Entity Disposition, and each of the Options covered
by this Agreement shall become fully vested and exercisable upon such Related
Entity Disposition. The Continuous Service of the Employee shall not be deemed
to terminate if an outstanding Option is assumed by the surviving corporation or
its parent entity in connection with a Related Entity Disposition. For purposes
of this paragraph, the term  "Related Entity Disposition" means the sale,
distribution or other disposition by the Company of all or substantially all of
the Company's interest in any Related Entity effected by a sale, merger or
consolidation or other transaction involving such Related Entity or the sale of
all or substantially all of the assets of such Related Entity.

     8.  Entire Agreement.  This Agreement and the Plan contain all of the
         ----------------
understandings between the parties hereto pertaining to the matters referred to
herein, and supersedes all undertakings and agreements, whether oral or in
writing, previously entered into by them with respect thereto.  The Employee
represents that, in executing this Agreement, he does not rely and has not
relied upon any representation or statement not set forth herein made by the
Company with regard to the subject matter of this Agreement or otherwise.

     9.  Amendment or Modification, Waiver.  No provision of this Agreement may
         ---------------------------------
be amended or waived unless such amendment or waiver is agreed to in writing,
signed by the Employee and by a duly authorized officer of the Company.  No
waiver by any party hereto of any breach by another party hereto of any
condition or provision of this Agreement to be performed by such other party
shall be deemed a waiver of a similar of dissimilar condition or provision at
the same time, any prior time or any subsequent time.

     10. Notices.  Each notice relating to this Agreement shall be in writing
         -------
and delivered in person or by certified mail to the proper address. All notices
to the Company shall be addressed to it at:

                                       2
<PAGE>

          Net2Phone, Inc.
          171 Main Street
          Hackensack, New Jersey  07601
          Attention:  Options Administrator

All notices to the Employee or other person or persons then entitled to exercise
the Options shall be addressed to the Employee or such other person or persons
at:

          ________________________________________
          ________________________________________
          ________________________________________

Anyone to whom a notice may be given under this Agreement may designate a new
address by notice to such effect.

     11.  Severability.  If any provision of this Agreement or the application
          ------------
of any such provision to any party or circumstances shall be determined by any
court of competent jurisdiction to be invalid and unenforceable to any extent,
the remainder of this Agreement or the application of such provision to such
person or circumstances other than those to which it is so determined to be
invalid and unenforceable, shall not be affected thereby, and each provision
hereof shall be validated and shall be enforced to the fullest extent permitted
by law.

     12.  Governing Law.  This Agreement shall be construed and governed in
          -------------
accordance with the laws of the state of Delaware, without regard to principles
of conflicts of laws.

     13.  Headings.  All descriptive headings of sections and paragraphs in this
          --------
Agreement are intended solely for convenience, and no provision of this
Agreement is to be construed by reference to the heading of any section or
paragraph.

     14.  Construction.  This Agreement is made under and subject to the
          ------------
provisions of the Plan, and all of the provisions of the Plan are hereby
incorporated herein as provisions of this Agreement. If there is a conflict
between the provisions of this Agreement and the provisions of the Plan, the
provisions of the Agreement shall govern. By signing this Agreement, the
Employee confirms that he has received a copy of the Plan and has had an
opportunity to review the contents thereof.

     15.  Counterparts.  This Agreement may be executed in counterparts, each of
          ------------
which shall be deemed to be an original but both of which together shall
constitute one and the same instrument.

                                       3
<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by
an authorized officer and the Employee has hereunto set his hand all as of the
date first above written.

                              NET2PHONE, INC.

                              By: ______________________________________
                                  Name:
                                  Title:

                              Employee:   ______________________________
                              Name:    _________________________________
                              Telephone:  ______________________________

                                       4

<PAGE>

                                                                   EXHIBIT 10.26

****CERTAIN PORTIONS OF THIS EXHIBIT HAVE BEEN OMITTED AND FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL
TREATMENT UNDER RULE 406 OF THE SECURITIES ACT OF 1933, AS AMENDED

                           [LOGO FOR NBC TV NETWORK]

June 25, 1999

Mr. Cliff Sobel
Net2Phone, Inc.
171 Main Street
Hackensack, NJ 07601

                   Purchase of NBC TV Advertising Inventory
                   ----------------------------------------

Dear Cliff:

This letter sets forth the agreement between National Broadcasting Company, Inc.
("NBC"), and Net2Phone, Inc. ("Advertiser") with respect to Advertiser's
purchase of certain NBC Television Network ("NBC TV") advertising inventory. The
terms and conditions shall be as follows:

1. Spots. NBC shall provide Advertiser with the use of thirty (30) second
advertising spots or such other lengths or formats of advertising as NBC and
Advertiser may mutually agree (collectively, the "Spots") to be telecast on NBC
TV prior to June 30, 2000 on the Dates, Days and Times reasonably determined by
NBC in accordance with schedules and strategies reasonably requested by
Advertiser following consultations with NBC. NBC agrees to telecast Spots with a
Total Spot Value (as defined below) of $1,500,000. All such Spots run by
Advertiser shall be subject to NBC TV's standard terms and conditions for such
advertising which are described in the "Participating Sponsorship Agreement"
attached hereto as Exhibit A (the "Standard Terms") and which are made a part
of this Letter Agreement in their entirety; provided, however, that in the case
of a conflict between the terms of this Letter Agreement and the terms of the
Standard Terms, the terms of this Letter Agreement shall govern. For purposes of
the Standard Terms, Advertiser shall be both the "Advertiser" and the "Agency"
as such terms are used therein.

2. Value of Spots. The value of each of Advertiser's Spots telecast by NBC TV
pursuant to the terms hereof shall be $1,500,000 (the "Total Spot Value"),
calculated, for each Spot, at ****% of the scatter market rate for the Date, Day
and Time in which the Spot will be telecast and as charged by NBC at the time
when such Spot is scheduled. Advertiser shall pay the Total Spot Value to NBC in
cash immediately following the consummation of Advertiser's initial public
offering. Advertiser agrees that NBC makes no guarantee regarding what the
actual rating for any particular Program will be and, therefore, will not be
obligated to provide any make-goods hereunder. The parties agree that no agency
fees or other expenses may be deducted by Advertiser in any way from payment of
the Total Spot Value to NBC.

3. Representations and Warranties. NBC and Advertiser each represent and warrant
that this Letter Agreement has been duly authorized, executed and delivered by
such party and that this Letter Agreement constitutes the legal, valid and
binding obligations of such party, enforceable against it in accordance with its
terms.

[****] REPRESENTS MATERIAL, WHICH HAS BEEN REDACTED AND FILED SEPARATELY WITH
THE COMMISSION, PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT PURSUANT TO
RULE 406 UNDER THE SECURITIES ACT OF 1933, AS AMENDED.


<PAGE>

                                 CONFIDENTIAL


4.   Confidentiality. Neither party shall issue a press release or make any
statement to the general public concerning this Letter Agreement, the Spots, or
the existence thereof, without the express prior written consent of the other;
provided, however, that NBC agrees that Advertiser may file this Letter
Agreement with the Securities and Exchange Commission (the "SEC") and describe
the terms of this transaction in any filing with the SEC if so required by the
Securities Act of 1933 and Securities Exchange Act of 1934, in each case, as
amended, the rules and regulations related thereto or any applicable state laws
(the "Securities Laws") as long as Advertiser agrees to use its reasonable
efforts to obtain confidential treatment of the economic and other material
terms hereof under the Securities Laws and to consult with NBC during the
process.

5.   Miscellaneous. This Letter Agreement and the exhibits and schedules
attached hereto constitute the entire agreement and understanding of the parties
relating to the subject matter hereof and supersedes all prior and
contemporaneous agreements, negotiations, and understandings between the
parties, both oral and written. No waiver or modification of any provision of
this Letter Agreement shall be effective unless in writing and signed by both
parties. Any waiver by either party of any provision of this Letter Agreement
shall not be construed as a waiver of any other provision of this Letter
Agreement, nor shall such waiver operate as or be construed as a waiver of such
provision respecting any future event or circumstance. The terms of this Letter
Agreement shall apply to parties hereto and any of their successors or assigns.
This Letter Agreement may be executed in counterparts, each of which when
executed shall be deemed to be an original but all of which taken together shall
constitute one and the same agreement.

6.   Governing Law and Jurisdiction. This Letter Agreement shall be governed by
and construed under the laws of the State of New York applicable to contracts
fully performed in New York, without regard to New York conflicts law. The
parties hereto irrevocably consent to and submit to the exclusive jurisdiction
of the federal and state courts located in the County of New York. The parties
hereto irrevocably waive any and all rights to trial by jury in any proceeding
arising out of or relating to this Agreement.

7.   Liability for Failure to Broadcast Spots. In the event that NBC does not
telecast Spots equal to the Total Spot Value pursuant to the terms and
conditions of this Agreement, then as liquidated damages and not a penalty, NBC
shall promptly pay Advertiser in cash an amount equal to the difference between
the Total Spot Value and the value of the Spots actually telecast, as calculated
in accordance with Section 2 above. Except for damages arising out of the gross
negligence of willful misconduct of either party hereto, no party shall  be
liable to the other party or its affiliates, officers, directors, successors or
assigns for any incidental, consequential, special or punitive damages or lost
profits arising out of this Letter Agreement, whether liability is asserted in
contract or tort and irrespective of whether it has advised or been advised of
the possibility of any such loss or damage.

<PAGE>

                                 CONFIDENTIAL


                                       3


     If you are in agreement with the above terms and conditions, please
indicate your acceptance by signing in the space provided below, and return one
original to me.

                                              Very truly yours,

                                              NATIONAL BROADCASTING
                                              COMPANY, INC.


                                              By: /s/ [ILLEGIBLE]
                                                  -----------------------------
                                              Name:
                                              Title:


ACCEPTED AND AGREED:

NET2PHONE, INC.



By: /s/ Clifford M. Sobel
   ------------------------------
Name:  Clifford M. Sobel
Title: President
<PAGE>

                                 CONFIDENTIAL


                                   Exhibit A
                                   ---------

                      Participating Sponsorship Agreement
                      -----------------------------------
<PAGE>

                                 CONFIDENTIAL


Participating Sponsorship Agreement - [NBC TELEVISION NETWORK LOGO HERE]
Part II


1. DEFINITIONS

"Advertiser" means advertiser named in Part I.

"Agency" means the advertising agency named in Part I (see also paragraph 23).

"NBC" means NBC Television Network, a Division of National Broadcasting Company,
Inc.

"paragraph" - all references to 'paragraphs' by numbers apply to this Part II.

"participation" means a sponsorship unit which entitles Advertiser to 30 seconds
of commercial time unless otherwise specified in Part I hereof.

"Program" means the program(s) and/or event(s) described in Part I intended for
telecast in which Advertiser is a sponsor.

"Section" references to 'Sections' by numbers apply to Part I of which this Part
II is a part (by attachment or by reference) and without which this Part II
shall be invalid.

"telecast" means the presentation and transmission of any of the programs
described in Part I on one occasion to any or all stations.

The four digit numerals within parentheses at the conclusion of certain
paragraphs are internal NBC printing codes and are not a part of this agreement.

Certain paragraphs are intentionally omitted for reasons of inapplicability.

2. STATIONS

   a. Stations Ordered. Stations ordered for Advertiser for the Program(s) shall
be the interconnected affiliated stations identified in the NBC TV Station List
and such other stations as NBC may elect to include in the Program's station
lineup, including delays, if any. NBC shall endeavor to make available as many
stations as possible. The status of availability of all ordered stations,
whether available or not, shall be included in the NBC TV Station List which
shall be furnished to Agency upon request.

   b. Station Lineup. Station lineup as used herein shall compromise all
stations which are available or may become available for the Program(s) on a
basis which is live or tape delayed.

   c. Addition of Ordered Stations. Stations which are initially reported
unavailable but which become available for the telecast(s) on either a live or
tape delayed basis shall become part of Advertiser's station lineup effective
immediately.

4. PACKAGE PRICE

   The package price(s) indicated in Part I include all charges except the
applicable Integrated Networking Charge and other charges for special commercial
requirements.

5. INTEGRATED NETWORKING CHARGE

   The Integrated Networking Charge listed in the current NBC Television Network
Commercial Integration Manual shall be applicable to each commercial insertion
up to and including 60 seconds in length. Announcements in excess of 60 seconds
will be billed at a proportionately higher charge. This production facilities
charge includes the services, as required, for program origination, videotaped
repeat network telecast(s), and satellite transmissions. Also included are the
normal insertions of tape commercials when originated from network control
points in New York and/or Burbank and the normal insertions of commercials into
delayed broadcasting tapes. Additional production charges may be made for
special commercial requirements in accordance with the NBC O&TS Rate Card. With
respect to late delivery of commercial material, charges and other conditions
will be in accordance with the NBC Television Network Commercial Integration
Manual.

6. PROGRAM

   a. Supplier. The Program(s) set forth in Part I will be supplied by NBC and
NBC will furnish for such Program(s) all the necessary creative elements,
production facilities and services therefor and personnel and talent required
for the appropriate television presentation of the Program(s). Each program will
conform to NBC's programming and operating policies and technical standards.


<PAGE>

                                 CONFIDENTIAL


    d. Production Facilities and Services. Production facilities and services
charges applicable to the Program(s) are included in the package price. Agency
will furnish all elements for and will bear all costs of the commercials. To the
extent feasible, NBC will provide, if requested, production facilities and/or
personnel for the production and presentation of commercials. Rates therefor
will be charged to Agency in accordance with the O&TS Rate Card (or at rates
quoted upon request where such Rate Card rates do not apply).

    Agency must deliver commercial material to NBC no later than 14 days prior
to the scheduled telecast and NBC shall insert such material into the program(s)
to be telecast.

7. AGENCY-FURNISHED MATERIAL

   a. Furnishing and Submission. All commercial announcements and talents and
material therefor and billboards where applicable (except as may be furnished by
NBC) and any other material furnished by Agency for the telecasts are
hereinafter collectively and individually referred to as Agency material. Agency
material must be furnished to NBC at least 14 days in advance of air date.
Agency warrants that it has obtained all necessary rights for the performance
and use of said agency material, including music performance.

   b. Compliance With Standards. Agency material must conform to the programming
and operating policies of NBC, and the quality of recorded Agency material must
comply with NBC's technical standards, and shall not contain copy or material
which conflicts with product protection rights granted to others by NBC. NBC has
the continuing right to require Agency and Advertiser to edit and modify any and
all Agency material to the extent NBC deems necessary to conform to the public
interest and to the programming and operating policies of NBC. NBC reserves the
right to refuse to accept for telecasting or to refuse to telecast any Agency
material which does not in its judgement conform to the public interest or to
such policies and standards, or which in the reasonable opinion of NBC may
violate the rights of others.

   c. Substitution by Agency. In the event of NBC's refusal to accept any
Agency material, Agency will substitute other material therefor acceptable to
NBC. The acceptance or rejection by NBC of any substitutes hereunder shall be
made by NBC in accordance with the requirements of paragraph 7b.

   d. NBC Rights on Agency's Failure to Furnish. In the event Agency fails to
furnish any Agency material as being provided, or in the event NBC disapproves
any Agency material and Agency fails to furnish substitutes therefor
satisfactory to NBC, NBC may, at its option, schedule promotional or public
service type announcements in place of Agency's regularly scheduled commercial
material without identification of Advertiser except as required by law or
administrative regulation. No such action on the part of NBC under this
paragraph shall relieve Agency of its obligation to make payments for all
charges as provided for hereunder.

9. INCREASES AND PROTECTION

   NBC reserves the right to change production facilities and services charges,
including the Integrated Networking Charge, effective on such date as announced
by NBC to the trade. Any such change which results in an increase to Advertiser
will not apply until three months after the date upon which such change is
announced by NBC.

10. ADVERTISING AGENCY COMMISSION

   The package price(s) set forth in Part I and the Integrated Networking Charge
include an advertising agency commission of 15%.

11. BILLING AND PAYMENT

   All charges hereunder will be billed to Agency on the second business day
following the month of telecast(s) and shall be paid on or before the 15th day
of the billing month (or such earlier date as set forth by any special payment
terms or as designated in Part I), it being agreed that time of payment is of
the essence. Notwithstanding disagreement between the parties as to particular
items of charge or credit as of the due date, all charges not specifically and
reasonably questioned by Agency shall be paid by such date. NBC's obligations
under this agreement are also conditioned upon full payment by Agency of all
obligations to NBC under preceding or concurrent agreements with NBC for the
same advertiser.

12. DAY AND TIME PERIOD OF SPONSORSHIP

   Part I reflects the day, starting time, program length and program to be
sponsored on a participating basis by Advertiser on the dates shown, expressed
in New York City Time (NYCT). Time for the purpose of this paragraph is
approximate. NBC reserves the right to advance or delay the starting time shown
and the further right to expand or contract the program length indicated.

   The program(s) hereunder are distributed across the country in various
configurations which utilize live and tape delay transmissions to stations.
Specific information with respect to such transmissions is available on request.

<PAGE>

                                 CONFIDENTIAL


14.  COMMERCIAL ENTITLEMENT

      Each date listed in Part 1 represents a 30-second participation for
commercial utilization in the program indicated, unless otherwise specified.

15.  COMMERCIAL POSITIONS

      The placement and designation of commercial positions shall be determined
by NBC. NBC reserves the right to revise any or all elements of the commercial
format in each of the programs hereunder to include changing of commercial
placement within programs. In certain program series, NBC retains the right to
move within the same program a participation(s) from one day of the week to
another day of the same week. NBC reserves the further rights to format the
programs so as to accommodate any combination of commercial elements and to
expand or contract any or all elements of the commercial format at any time to
meet the competitive forces of the industry.

16.  CAST COMMERCIALS

      Cast Commercials, including placement thereof, are subject to the review
and approval of NBC Advertising Standards and Sales Services.

17.  PRODUCTS TO BE ADVERTISED

      a. Protected Products. NBC will endeavor to avoid scheduling products
competitive or antithetical to single-product commercials of at least 30 seconds
duration within the commercial interruption (i.e. pod) in which such commercial
is scheduled. Such competitive or antithetical avoidance is known as product
protection. Product protection throughout this paragraph 17 applies only to
other network advertisers obtained by the NBC Television Network.

      Product protection will not be granted to commercials which are multi-
product 30-second commercials nor to any commercial of less than 30 seconds in
length.

      Changes in designation of protected products may be made only upon receipt
of NBC's approval. Requests for such changes in designation must be submitted to
the NBC Television Network Sales Department not less than 14 days prior to the
desired date of such change(s).

      b. Exclusive Basis Products. In certain programs, some products may be
established as exclusive basis products which entitle such products to broader
product protection than that which is indicated in subparagraph "a" above. The
products (if any) granted such exclusivity and the extent of the product
protection granted thereby is specified in Part 1.

      c. Non-Exclusive Basis Products. Advertiser's products other than
protected products may be advertised hereunder on a non-exclusive basis
providing NBC's approval has been obtained in advance in writing. The
advertising of non-exclusive basis products is subject to discontinuance on 24
hours notice in the event the advertising of such non-exclusive basis products
conflicts with product commitments made by NBC to others.

      d. Other Products. Products other than protected and NBC approved
non-exclusive basis products may not be advertised on any program hereunder.
Commercials for such other products may be removed or deleted by NBC without
prior notice and Advertiser will not be relieved of its obligation for any of
the charges hereunder by reason of such removal or deletion.

      e. Nature of Approvals. Approvals referred to above in this paragraph 17
must be obtained in writing from NBC. Approval of products or commercial
material for compliance with NBC's Advertising Standards, while ultimately
required under paragraph 7, does not constitute NBC's approval under this
paragraph 17.

18.  BILLBOARDS

      Certain programs provide billboards. The billboard is a brief announcement
identifying the sponsor or partial sponsor of a program. It is not intended for
use as a commercial announcement. If so indicated in Part 1, Advertiser shall
be allowed a billboard of the type and duration specified therein. Such
billboard will consist of visual and/or audio material acceptable to NBC.
Placement of billboards shall be designated by NBC and may be scheduled adjacent
to billboards and/or commercials of other sponsors in the program.

19.  LEAD-INS

      Lead-in copy of a transitional nature may be used in certain types of
programs. Such copy must be limited to five seconds in length and must be devoid
of commercial sell and comparative references. The program host or other
individual designated by NBC shall be made available for lead-ins. In no event
may lead-ins be used separately from the commercial it was intended to be lead
into, nor combined to form a longer lead-in.

20.  AGENCY TERMINATION RIGHTS

      If so provided in Part 1, Agency shall have the right to terminate a
portion of Advertiser's sponsorship, effective with the termination dates shown
in Part 1, on prior written notice to NBC as provided therein.

<PAGE>

                                 CONFIDENTIAL


21. PROGRAM SUBSTITUTION AND TRANSFER

    a. Program Substitution. Except as set forth in paragraphs 21c and 21d
hereof, NBC may substitute another program for any program hereunder. In such
event, Advertiser's participation(s) will be scheduled by NBC in a replacement
program(s) provided such replacement program(s):

       i. is(are) of comparable quality with comparable demographics.
      ii. is(are) available to advertisers on a participation basis.
     iii. is(are) comparably priced, and
      iv. present(s) no product or scheduling conflicts

    c. Daytime Programs (Monday through Friday 9:00am-4:30pm NYCT). NBC has the
right to change the time period and/or discontinue telecasting any or all of its
Daytime Programs on reasonable prior notice. In the event of such discontinuance
or time period change, Advertiser's participation(s) so affected will be
transferred to a mutually agreeable substitute program(s) where available.

    d. Unique Programs. The provisions of this paragraph 21 are not applicable
to unique programs such as major sporting events, major award presentation
programs, and coverage of a special news event.

22. IMPOSSIBILITY OF AGENCY PERFORMANCE

    In the event Agency is unable or fails to supply agency material, NBC may,
at its option, in addition to any other remedies which may be available to it,
terminate this agreement forthwith, and upon such termination, Agency,
Advertiser, and NBC will be relieved of further liability hereunder except with
respect to obligations incurred or arising out of telecasts made prior to such
termination.

24. PREEMPTION

    a. General. NBC reserves the right to preempt all or any portion of any
telecast of any of the programs hereunder in order to telecast events or
programs of public importance, news reports, political programs, sports events,
special programs, or special events. NBC agrees that in the event of such
preemption, as much advance notice as is practicable will be given to Agency. In
the event of a preemption involving the elimination of Advertiser's
participation(s), NBC will be relieved of its obligation to telecast
Advertiser's participation(s) hereunder and Agency will be relieved from paying
any charges hereunder for the participation(s) so eliminated unless Advertiser's
participation(s) are resheduled as may be provided for elsewhere herein.

    b. Partial Political. NBC also reserves the right to preempt the last five
minutes of any telecast preceding an election day generally observed throughout
a majority of the United States. In the event of such five minutes preemption
which does not affect Advertiser's participation(s), the affected program will
be edited to the required length at NBC's expense and there shall not be any
adjustment in any of the charges hereunder to Agency.

25. NETWORK FAILURE TO TELECAST

    In the event NBC fails to present over its network facilities any telecast
hereunder because of unavailability of technical facilities, defect or breakdown
of equipment or transmission facilities, labor dispute, government action, the
unforeseen absence of a principal performer, or any cause beyond the control of
NBC, whether of a similar or dissimilar nature. NBC's liability herefor shall be
limited solely to cancellation of all charges to Agency hereunder for such
affected telecast and such failure to telecast shall not constitute a breach of
this agreement.

26. LOSS OF SPONSORSHIP/AUDIENCE DEFICIENCY

    For the purpose of determining loss, each participation shall be treated as
a complete and separate sponsorship. Where split 60-second commercials, the
contiguous announcements in a 60-second commercial, and 15-second commercials
are utilized, each component shall be deemed a complete and separate
sponsorship.

    If NBC fails to carry all or any part of Advertiser's commercial to the
extent that the substance of the commercial announcement is lost on the entire
station lineup, NBC will negotiate in good faith for a makegood.

    If NBC fails to achieve agreed upon audience delivery, NBC will negotiate in
good faith and deliver a makegood no later than by the end of the calendar year
following the end of a broadcast season.

27. INDEMNIFICATION AND DEFENSE

    a. NBC Obligation. NBC agrees to indemnify and hold harmless Advertiser,
Agency and their respective directors, officers, agents and employees against
and from any and all claims, liability, loss and damage, including reasonable
attorney's fees, caused by or arising wholly or in part out of the telecasting
of NBC material hereunder and to defend at its own expense any litigation
instituted by others against any of them resulting therefrom.
<PAGE>

                                 CONFIDENTIAL


      b. Agency Obligations. Agency agrees to indemnify and hold harmless NBC,
the stations over which the sponsored telecasts are carried and their owners,
the package producer of the program (if any involved) and the talent thereof and
the other advertisers in the program and their agencies, and their respective
directors, officers, agents and employees against and from any and all claims,
liability, loss and damage, including reasonable attorneys' fees, caused by or
arising wholly or in part out of the telecasting of Agency material hereunder
and to defend at its own expense any litigation instituted by others against any
of them resulting therefrom.

      c. Distinction. For the purposes of this paragraph 27 only, Agency
material (see paragraph 7a) shall be deemed to include ad lib acts or utterances
of personnel furnished by Agency or Advertiser, and NBC material shall be deemed
to include material furnished by NBC as referred to in paragraph 6 and ad lib
acts and utterances of personnel furnished by NBC and material furnished by
other agencies or advertisers for the telecasts. NBC's acceptance or approval of
Agency material will not affect Agency's obligation for defense and
indemnification hereunder.

      d. Control of Litigation. The indemnitor hereunder shall have full control
of the defense of such litigation and may settle, compromise or adjust the same,
provided, however, that the indemnitee, upon relieving the indemnitor in writing
of the obligations imposed hereunder for defense and indemnification, shall have
the right, if it so elects, to conduct such litigation at its own expense by its
own counsel.

      e. Notice and Duration. The following obligations for defense and
indemnification shall be imposed only if (1) the indemnitee sends to the
indemnitor timely written notice of first service of process upon the indemnitee
and a timely written request to defend the litigation (such notice and request
shall be deemed timely if given within a reasonable length of time after receipt
of service by the indemnitee and a reasonable length of time prior to the date
by which first response to such process is legally required, considering all the
circumstances; and (2) while such litigation is pending, the indemnitee upon
request, shall furnish to the indemnitor all relevant facts and documentary
material in the former's possession or under its control, and shall make its
employees or other persons under its control with knowledge of relevant facts
available to the indemnitor for consultation and as witnesses at their customary
places of business. The indemnity right and defense obligations hereunder shall
survive the termination or expiration of this agreement and of Agency's status
as advertising agency for Advertiser.

29.  ABSENCE, INCAPACITY, OR DEATH

      The temporary or sudden absence for any reason, or death, of any regular
principal performer including but not limited to newscasters and sportscasters
on the program(s) hereunder will be accommodated for as NBC deems appropriate by
substitutions of a performance of comparable stature or if practicable, by
writing out of the character portrayed or by substitution of another comparable
program.

30.  USE OF NAME AND LIKENESS

      Except for programs which consist of motion picture films, NBC hereby
authorizes Agency and Advertiser to use and license others to use during the
term hereof the title of the Program(s) and the name, sobriquet, biography and
likenesses of regular featured performers in the Program(s) for informative
purposes and to advertise and publicize the network and the Program(s) through
tune-in advertising either alone or in conjunction with the advertising of the
protected products of Advertiser as designated hereunder. Names, sobriquets,
biographies and likenesses of the regular featured performers will not be used
without the prior written approval of NBC. No such use shall be for advertising
(except as specifically above stated) or merchandising use nor for an express or
implied endorsement of any product or service except upon the written permission
of the person involved and NBC. No such use in connection with the Program(s)
hereunder may continue beyond the termination of Advertiser's sponsorship in any
such Program(s) or of the participation of such characters or persons in the
Program(s), and Agency will take all reasonable steps to require discontinuance
of utilization of any previously released display material involving any such
use within 30 days after such termination.

      For a sports program, the reference to featured performers is to the
announcers furnished by NBC and not to any participant in the sporting event.

      For programs which consist of motion picture films, the NBC authorization
within this paragraph 30 shall be limited to the title of the program and shall
not apply to the title of a specific motion picture nor to any of the featured
performers of the motion picture film.

31.  RIGHTS AND RESTRICTIONS ON USE OF TELECASTS

      NBC may use or license to be used all or any part of the programs
hereunder by or for the Armed Services and for telecasting in connection with
documentary programs. Neither Agency nor Advertiser will authorize anyone to
telecast or to utilize for any commercial purposes, other than for telecasts
hereunder, the actual telecasts made by NBC, or any part of such telecasts,
including material supplied by Agency, whether such other use of the actual
telecasts be by means of tape or film, except for recording of Agency material
specifically authorized and released in accordance with applicable NBC policy.
Nothing herein contained shall prevent Agency from making subsequent use of
Agency material (as distinguished from telecasts by NBC of such material).
<PAGE>

                                 CONFIDENTIAL


32. MATERIAL AND PROPERTY OF AGENCY OR ADVERTISER

    Material or property (other than recorded commercial material) furnished by
Agency or Advertiser for use on or in connection with the telecasts hereunder
must be removed from NBC areas at Agency's expense within six days after the
date of program performance, and if not so removed, Agency will be billed and
will pay storage charges effective commencing the day following the date of
program performance. All recorded commercial material which has not been
telecast for a period of 45 days will be destroyed. If Advertiser submits a
written request to NBC to return such recorded commercial material prior to the
expiration of the 45 day period, NBC will endeavor to comply at Agency's
expense. Agency and Advertiser hereby release NBC from any liability arising out
of damage to or loss of any material or property furnished by Agency or
Advertiser for use on or in connection with telecasts hereunder except for
damage or loss caused by the demonstrable negligence of NBC or its employees. In
no event will NBC be reponsible for damages to or loss of any such material or
property left with NBC for any extended period except such material or property
so left pursuant to written agreement of the parties specifically identifying
the same. Unless otherwise agreed to in writing, NBC retains title to all
scenery, props, costumes and other material furnished by NBC.

   NBC will be under no liability with respect to the handling or forwarding of
audience mail addressed to NBC or the stations listed in the Station List
intended for use by or for the benefit of Agency or Advertiser.

33. PARTIES

    This agreement is entered into for Advertiser by Agency as Advertiser's
agent. Agency represents and warrants that it is the duly authorized agent of
Advertiser for the purposes of this agreement and the matters contemplated
hereby and that its arrangements with Advertiser specifically contemplate the
placement of the advertising herein provided and the servicing thereof and the
allowance of agency commission as herein provided. It is understood that Agency
functions as paying agent for Advertiser hereunder and in no sense as an agent
or representative of NBC and that Advertiser will continue to be obligated for
all payments due to NBC hereunder until the actual receipt thereof by NBC.

    If at any time during the term hereof Agency ceases to be the advertising
agency for Advertiser, the then rights and duties of Agency herein shall,
subject to the provisions of paragraph 27 hereof, insure to the benefit of and
be binding on any other advertising agency, acceptable to NBC as to financial
responsibility, designated by Advertiser in writing to NBC therefor. If this
agreement is executed by Advertiser rather than its advertising agency, or if at
any time during the term hereof, Agency ceases to be the advertising agency for
Advertiser, and if NBC has not exercised its right of termination under
paragraph 22, and Advertiser has not designated to NBC in writing another
advertising agency similarly acceptable, the term "Agency" shall mean
"Advertiser."

34. NOTICES

    Notices to Agency and NBC hereunder shall be given by personal delivery,
postpaid mail, or overnight courier services to the Agency at its address and to
the person if any, shown in Part I and to NBC at 30 Rockefeller Plaza, New York,
New York 10112, attention of President, Sales, Television Network. The date of
such personal delivery, mailing, or delivery to courier services shall be deemed
the date of service.

35. GENERAL PROVISIONS

    This agreement is made subject to all Federal, State and Municipal laws and
regulations now or hereafter in force and is not assignable in whole or in part,
except as otherwise herein specifically provided, without the consent of NBC and
shall be governed by the laws of the State of New York, excluding all principles
of referral to the laws of other jurisdictions which might otherwise be
applicable under doctrines of conflicts of laws. Agency and Advertiser represent
and warrant that this agreement represents a sponsorship arrangement exclusively
between NBC and Advertiser and that no subordination arrangement or other sale
or exchange has taken place or will take place between Advertiser and any other
person or entity. Waiver of rights resulting from breach of any provision hereof
shall not be deemed to constitute a waiver of rights resulting from any previous
or succeeding breach of the same or any other provision. Except as herein
otherwise specifically provided, this agreement constitutes the entire Agreement
between the parties relating to the subject matter hereof and may not be
changed, modified, renewed, extended or discharged except by an agreement in
writing, signed by the party against whom enforcement of the change,
modification, renewal, extension or discharge is sought.


<PAGE>


                                                                    EXHIBIT 23.1


                        CONSENT OF INDEPENDENT AUDITORS


We consent to the reference to our firm under the captions "Selected Financial
Data" and "Experts" and to the use of our report dated May 14, 1999 (except for
Note 9, as to which the date is June 22, 1999), in the Registration Statement
(Form S-1 No. 333-78713) and related Prospectus of Net2Phone, Inc. for the
registration of shares of its common stock.


                                              /s/ Ernst & Young LLP

New York, New York
June 25, 1999


<TABLE> <S> <C>

<PAGE>


<ARTICLE> 5

<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                    YEAR                    YEAR                    9-MOS
<FISCAL-YEAR-END>                          JUL-31-1996             JUL-31-1997             JUL-31-1998             JUL-31-1999
<PERIOD-START>                             AUG-01-1995             AUG-01-1996             AUG-01-1997             AUG-01-1998
<PERIOD-END>                               JUL-31-1996             JUL-31-1997             JUL-31-1998             APR-30-1999
<CASH>                                               0                       0                  10,074               1,782,194
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                        0                  16,500               1,465,475                 329,577
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                                     0                  16,500               1,475,549               6,488,998
<PP&E>                                         182,950               1,028,300               6,264,345              10,300,194
<DEPRECIATION>                                   8,275                 128,775                 855,284               2,071,976
<TOTAL-ASSETS>                                 174,674                 916,025               6,975,108              19,818,328
<CURRENT-LIABILITIES>                          681,532               3,121,330              12,625,102              23,744,450
<BONDS>                                              0                       0                       0                       0
                                0                       0                       0                       0
                                          0                       0                       0                       0
<COMMON>                                             0                     100                 100,100                 309,600
<OTHER-SE>                                   (507,758)             (2,205,305)             (5,750,094)             (4,235,722)
<TOTAL-LIABILITY-AND-EQUITY>                   174,674                 916,025               6,975,108              19,818,328
<SALES>                                              0               2,652,303              12,005,972              22,203,257
<TOTAL-REVENUES>                                     0               2,652,303              12,005,972              22,203,257
<CGS>                                                0               1,553,443               6,848,759              11,848,089
<TOTAL-COSTS>                                  507,758               4,349,950              15,550,661              25,109,223
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0                       0
<INCOME-PRETAX>                              (507,758)             (1,697,647)             (3,544,689)             (2,905,966)
<INCOME-TAX>                                         0                       0                       0                       0
<INCOME-CONTINUING>                                  0                       0                       0                       0
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                 (507,758)             (1,697,647)             (3,544,689)             (2,905,966)
<EPS-BASIC>                                   (0.02)                  (0.05)                  (0.11)                  (0.09)
<EPS-DILUTED>                                   (0.02)                  (0.05)                  (0.11)                  (0.09)


</TABLE>

<PAGE>

                                                                    EXHIBIT 99.1

                           CONSENT OF DIRECTOR NOMINEE

        The undersigned, pursuant to Rule 438 under the Securities Act, consents
to the use of his name in the Registration Statement on Form S-1 of Net2Phone,
Inc. as a person who is a Director Nominee of Net2Phone, Inc.


                                        /s/ RAPHAEL S. GRUNFELD
                                        --------------------------------
                                        Raphael S. Grunfeld


Date: June 25, 1999




<PAGE>

                                                                    EXHIBIT 99.2

                          CONSENT OF DIRECTOR NOMINEE

        The undersigned, pursuant to Rule 438 under the Securities Act, consents
to the use of his name in the Registration Statement on Form S-1 of Net2Phone,
Inc. as a person who is a Director Nominee of Net2Phone, Inc.


                                        /s/ Stephen A. Oxman
                                        --------------------------------
                                        Stephen A. Oxman


Date: June 27, 1999



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