ITXC CORP
S-1/A, 1999-07-15
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>


   As filed with the Securities and Exchange Commission on July 15, 1999

                                                 Registration No. 333-80411

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                            Amendment No. 1 to
                                    FORM S-1
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                              ------------------
                                   ITXC Corp.
             (Exact name of registrant as specified in its charter)
                              ------------------
        Delaware                      4813                   22-35-31960
     (State or other
     jurisdictionof
    incorporation or
      organization)
             (Primary Standard IndustrialClassification Code Number)
                                                               (I.R.S.
                                                        EmployerIdentification
                                                                 no.)
                             600 College Road East
                          Princeton, New Jersey 08540
                                 (609) 419-1500
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)

                              ------------------
                              Mr. Edward B. Jordan
                            Chief Financial Officer
                                   ITXC Corp.
                             600 College Road East
                          Princeton, New Jersey 08540
                            (609) 419-1500, Ext. 108
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                              ------------------
                                 with copies to

           Peter H. Ehrenberg                     Edward P. Tolley III
         Lowenstein Sandler PC                 Simpson Thacher & Bartlett
          65 Livingston Avenue                    425 Lexington Avenue
       Roseland, New Jersey 07068               New York, New York 10017
             (973) 597-2500                          (212) 455-2000
                              ------------------
   Approximate date of commencement of 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, 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 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,
please check the following box. [_]

                              ------------------
                        CALCULATION OF REGISTRATION FEE
<TABLE>
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
<CAPTION>
                                    Proposed maximum
    Title of each class of         aggregate offering           Amount of
  securities to be registered           price(1)           registration fee(2)
- ------------------------------------------------------------------------------
<S>                             <C>                      <C>
Common Stock, par value $.001
 per share....................        $86,250,000                $23,978
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
</TABLE>
(1) Estimated solely for the purpose of determining the registration fee
    pursuant to Rule 457 under the Securities Act of 1933.

(2) Previously paid.
                              ------------------

   The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant
shall file a further amendment which specifically states that this registration
statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until this registration statement shall become
effective on such date as the 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 we are not soliciting offers to buy these +
+securities, in any state where the offer or sale is not permitted.            +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                Subject to Completion, dated July 15, 1999

PROSPECTUS
                                       Shares

                                     [Logo]

                                   ITXC Corp.
                                  Common Stock

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

  This is our initial public offering of shares of common stock. We are
offering      shares. Of the      shares being offered, we are offering
shares in the United States and Canada and      shares outside the United
States and Canada.

  We expect the public offering price to be between $    and $    per share. No
public market currently exists for our shares.

  We have applied to list the shares on the Nasdaq National Market under the
symbol "ITXC".

     Investing in the shares involves risks. Risk Factors begin on page 5.

<TABLE>
<CAPTION>
                                                                Per Share Total
                                                                --------- -----
<S>                                                             <C>       <C>
Public offering price.........................................     $       $
Underwriting discount.........................................     $       $
Proceeds to ITXC..............................................     $       $
</TABLE>

  We have granted the U.S. underwriters a 30-day option to purchase up to
additional shares of common stock and the international underwriters a 30-day
option to purchase up to     additional shares of common stock, in each case on
the same terms and conditions as set forth above solely to cover over-
allotments, if any.

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if
this prospectus is accurate or complete. Any representation to the contrary is
a criminal offense.

  Lehman Brothers, on behalf of the underwriters, expects to deliver the shares
on or about        , 1999.

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

Lehman Brothers
          CIBC World Markets
                                           First Analysis Securities Corporation

      , 1999
<PAGE>

[Outside panel of fold-out: A graphic depicting ITXC.net as a global overlay
network connecting telephones, carrier affiliates, SNARCs and terminating
affiliates using data networks and circuit-based networks.]

<PAGE>

[Inside panel of fold-out: A graphic showing map of the world depicting
locations of ITXC points of presence, carrier affiliates and SNARCs, including a
bar chart showing minute growth in recent periods.]

<PAGE>

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----
<S>                                                                       <C>
About this Prospectus....................................................   i
Prospectus Summary.......................................................   1
Risk Factors.............................................................   5
Use of Proceeds..........................................................  15
Dividend Policy..........................................................  16
Capitalization...........................................................  17
Dilution.................................................................  18
Selected Historical Financial Data.......................................  19
Management's Discussion and Analysis of Financial Condition and Results
 of Operations...........................................................  20
Our Business.............................................................  30
Management...............................................................  50
</TABLE>
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Executive Compensation.....................................................  53
Certain Transactions.......................................................  60
Principal Stockholders.....................................................  63
Description of Capital Stock...............................................  66
Shares Eligible for Future Sale............................................  69
Certain U.S. Federal Income Tax Consequences to Non-U.S. Holders...........  71
Underwriting...............................................................  75
Legal Matters..............................................................  80
Experts....................................................................  80
Additional Information.....................................................  80
Index to Financial Statements.............................................. F-1
</TABLE>

                             ABOUT THIS PROSPECTUS

   You should only rely 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.



   Until      , 1999, all dealers selling shares of the common stock, whether
or not participating in these offerings, may be required to deliver a
prospectus. This is in addition to the obligation of dealers to deliver a
prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.

                                 NOTE TO READER

   This registration statement contains two separate prospectuses. The first
prospectus relates to a public offering in the United States and Canada of
shares of common stock. The second prospectus relates to a concurrent offering
outside the United States and Canada of      shares of common stock. The
prospectuses for the U.S. offering and the international offering will be
identical with the exception of the front cover page for the international
offering. These alternate pages appear in this registration statement
immediately following the complete prospectus for the U.S. offering.

                                       i
<PAGE>

                               PROSPECTUS SUMMARY

   This summary highlights selected information about us. It is not complete
and may not contain all of the information that you should consider before
investing in our common stock. You should carefully read this entire document,
including the "Risk Factors" section beginning on page 5 and the consolidated
financial statements and their related notes beginning on page F-1. Unless
otherwise indicated, the information in this prospectus assumes that the
underwriters will not exercise their over-allotment option, and each
outstanding share of our Series B convertible preferred stock and Series C
convertible preferred stock will be converted into one share of our common
stock upon the closing of the offerings. When we refer to "affiliates" with
respect to our network, we are referring to unrelated third-parties that
terminate voice, fax and voice-related traffic on our network.

                                  Our Company

   We are a leading global provider of high quality Internet-based voice, fax
and voice-enabled services. Our network and proprietary software allow our
customers to capitalize on the convergence of traditional circuit-switched
voice networks with both private and public data networks, such as the
Internet. We have developed and deployed ITXC.net, an actively managed network
that is overlayed on the public Internet. ITXC.net is designed to deliver high
quality voice communications over the Internet and other data networks. As part
of ITXC.net, we have established ITXC-owned facilities in the U.S. and arranged
call termination and origination with affiliates throughout the world. We
believe that ITXC.net enables us to provide our customers with the cost savings
of data networks and the global reach of the Internet, while providing a
platform for additional value-added services. We believe that the proliferation
of high capacity data networks provides the necessary infrastructure to rapidly
deploy ITXC.net on a global basis.

   In April 1998, we introduced our WWeXchangeSM service, our first application
using ITXC.net. This service provides international call completion over the
Internet to our carrier and communications service provider customers and
enables them to offer their own customers phone-to-phone global voice services.
We have achieved significant growth in the use of our network since commencing
this service. We have increased from 47,000 minutes of traffic during the
quarter ended June 30, 1998, to over 11.0 million minutes of traffic during the
quarter ended March 31, 1999, and more than 12.6 million minutes of traffic
during the two month period ended May 31, 1999. We believe that the rapid
growth of traffic on ITXC.net demonstrates that our proprietary technology and
techniques, which we refer to as BestValue RoutingSM, are effective in
enhancing the quality of voice, fax and voice-enabled services delivered over
the Internet. We actively manage ITXC.net with BestValue Routing to avoid
congestion and select optimal routes.

   We have developed a reliable, scalable network by using the Internet for
transport and our affiliates' local infrastructure for terminating traffic. Our
early entrant status has resulted in what we believe to be the broadest global
network for Internet telephony. We believe that

                                       1
<PAGE>


the scale of our network provides us with a significant advantage in increasing
market share and introducing value-added services. We have established ITXC-
owned facilities in the U.S. and have arranged call origination and termination
services with affiliates in more than 75 international cities operating more
than 110 ITXC.net points of presence. Our affiliates include Bell Atlantic,
China Telecom and Korea Telecom. On a typical day, we originate voice or fax
traffic from over 30 countries and deliver it to more than 140 countries.

   In addition, we have recently introduced a new proprietary device called a
SNARCTM, which we believe will facilitate the use of our network by our
customers. These devices allow our customers to access our network directly
from their premises, avoiding the costs of dedicated connections to network
hubs and improving the economics of our services to them. We believe that
SNARCs will strengthen our customers' relationships with us and position us to
deploy enhanced services.

   We believe that data networks offer superior functionality to circuit-
switched networks and, when actively managed, that the Internet will usually be
the network of choice for voice, fax and voice-enabled services. We believe
that our early entrant status and our experience in providing high quality
voice communication over ITXC.net since April 1998 positions us to take
advantage of the convergence of voice-enabled services and data networks,
including the Internet.

                                  Our Strategy

   Our goal is to be the leading provider of Internet-based voice, fax and
voice-enabled services. In order to achieve this goal we intend to:

     .  Exploit our network scale and early entrant status

     .  Rapidly expand ITXC.net by adding additional affiliates worldwide

     .  Capitalize on the attributes of the Internet

     .  Establish ITXC.net as the standard for quality in our industry

     .  Bring Internet voice capability to our customers' premises

     .  Continue to provide leadership in interoperability initiatives

     .  Deliver additional voice-enabled services over ITXC.net

                          Principal Executive Offices

   Our principal executive offices are located at 600 College Road East,
Princeton, New Jersey 08540, and our telephone number is (609) 419-1500.

                                       2
<PAGE>

                                 The Offerings

Common stock offered by ITXC:
<TABLE>
 <C>                            <S>
    U.S. offering.............. shares
    International offering..... shares
        Total.................. shares

 Common stock outstanding after
  the offerings................ shares
 Use of proceeds............... We estimate that we will receive net proceeds
                                from the offerings of approximately $
                                million, or $    million if the underwriters
                                exercise their over-allotment option in full,
                                assuming an initial public offering price of $
                                per share and after deducting the estimated
                                underwriting discounts and offering expenses.
                                We intend to use the net proceeds:
                                .  to fund capital expenditures and operating
                                   expenses to expand our network and improve
                                   our technology;
                                .  to finance increased sales and marketing
                                   efforts focused primarily upon international
                                   expansion;
                                .  to repay debt under our line of credit; and
                                .  for general corporate purposes.
                                We may also use a portion of the net proceeds
                                to acquire complementary businesses or
                                technologies. We cannot specify with certainty
                                all of the particular uses for the net proceeds
                                we will have upon completion of the offerings.
                                See "Use of Proceeds."
</TABLE>

Nasdaq National Market    "ITXC"
symbol.............

   You should be aware that we are permitted, and in some cases obligated, to
issue shares of common stock in addition to the common stock that will be
outstanding after the offerings. If and when we issue these shares, the
percentage of the common stock you own will be diluted. The following is a
summary of additional shares of common stock that we have currently reserved
for issuance as of June 10, 1999:

  .  3,120,597 shares are issuable upon the exercise of options or other
     benefits under our stock incentive plan, consisting of:

    .  outstanding options to purchase 2,576,472 shares at a weighted
       average exercise price of $1.97 per share, of which options covering
       157,691 shares were exercisable as of June 10, 1999; and

    .  544,125 shares available for future awards after June 10, 1999;

  .  439,883 shares are issuable upon the exercise of outstanding warrants at
     a weighted average exercise price of $1.71 per share; and

  .  250,000 shares are issuable under our employee stock purchase plan.

   For a description of our stock incentive plan and our employee stock
purchase plan, see "Executive Compensation--1998 Incentive Stock Option Plan"
and "Executive Compensation--Employee Stock Purchase Plan."

                                       3
<PAGE>

                      Summary Consolidated Financial Data

   The following summary financial data for the period from our July 21, 1997
date of inception to December 31, 1997 and for the year ended December 31, 1998
are derived from our audited consolidated financial statements. The following
summary financial data for the quarters ended March 31, 1998 and 1999 are
derived from our unaudited financial statements. You should read the
information that we have presented below in conjunction with our consolidated
financial statements, related notes and other financial information included
elsewhere in this prospectus. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations," "Use of Proceeds" and
"Capitalization."

<TABLE>
<CAPTION>
                                  Period From
                                 July 21, 1997
                              (date of inception)                  Quarter
                                      to           Year ended  ended March 31,
                                 December 31,     December 31, ----------------
                                     1997             1998      1998     1999
                              ------------------- ------------ ------- --------
                                   (in thousands, except per share data)
<S>                           <C>                 <C>          <C>     <C>
Statement of Operations
 Data:
Revenue.....................         $ 500          $ 1,538    $  300  $  3,029
Total costs and expenses....           706            8,995       931     6,014
Net loss....................          (205)          (7,276)     (631)   (2,944)
Basic and diluted net loss
 per share applicable to
 common stockholders........         (0.06)           (1.78)    (0.16)    (0.73)
Weighted average shares used
 in computation of basic and
 diluted net loss per share
 applicable to common
 stockholders...............         3,502            4,092     3,900     4,191
Pro forma basic and diluted
 net loss per share.........                          (0.83)              (0.24)
Weighted average shares used
 in computation of pro forma
 basic and diluted net loss
 per share..................                          8,799              12,034
</TABLE>

<TABLE>
<CAPTION>
                                                    As of March 31, 1999
                                                ------------------------------
                                                Actual   Pro Forma As Adjusted
                                                -------  --------- -----------
                                                       (in thousands)
<S>                                             <C>      <C>       <C>
Balance Sheet Data:
Cash, cash equivalents and short-term
 investments................................... $16,709   $16,710
Total assets...................................  22,015    22,016
Long-term obligations, including current
 portion.......................................   1,936     1,936      213
Working capital................................  13,518    13,519
Total stockholders' equity (deficit)...........  (8,983)   15,929
</TABLE>
- --------

   The pro forma line items in the operating statement data presented above and
the pro forma column in the balance sheet data presented above give effect to
the conversion of all outstanding shares of our convertible preferred stock
into common stock and the June 11, 1999 exercise of warrants covering 722,000
shares of our common stock as if such conversion and exercise had occurred at
the dates of issuance. The as adjusted column in the balance sheet data
presented above reflects the sale of      shares of common stock in the
offerings at an assumed initial public offering price of $  per share after
deducting the estimated underwriting discounts and offering expenses payable by
us. The as adjusted column also reflects the use of $1.7 million of the net
proceeds of the offerings to repay all outstanding indebtedness on our line of
credit.

                                       4
<PAGE>

                                  RISK FACTORS

   You should carefully consider the following factors as well as the other
information in this prospectus before deciding to invest in shares of our
common stock.

An investment in ITXC is difficult to evaluate because we have a limited
operating history.

   It is difficult to evaluate an investment in ITXC because we have had only a
limited operating history during which to evaluate our revenues and expenses.
We were incorporated in Delaware in 1997 and began our first commercial service
in April 1998. In addition, our senior management team and other employees have
worked together at ITXC for only a short period of time. Our chief operating
officer, John G. Musci, only joined us in February 1999.

We have not been profitable and expect future losses.

   To date, we have not been profitable. We may never be profitable or, if we
become profitable, we may be unable to sustain profitability. We have incurred
significant losses since inception. We reported a net loss of $0.2 million for
the inception period from July 21, 1997 through December 31, 1997, $7.3 million
for the year ended December 31, 1998 and $2.9 million for the quarter ended
March 31, 1999. We expect to continue to incur significant losses for the
foreseeable future. As of March 31, 1999, our accumulated deficit was $10.4
million. Our revenue may not grow or may not even continue at the current
level.

The growth of ITXC.net depends upon the growth of the Internet, which may not
continue.

   The growth of ITXC.net depends on continued growth in the use of the
Internet generally and on the growth in the use of the Internet through
telephones and other devices, rather than personal computers. Growth of the
Internet may be inhibited by a number of factors, such as:

     .  quality of infrastructure;

     .  security concerns;

     .  technological failures, such as viruses;

     .  inconsistent quality of service; and

     .  lack of availability of cost-effective, high-speed service.

   Even if Internet usage grows, the Internet infrastructure may not be able to
support the demands placed on it by this growth or its performance or
reliability may decline.

                                       5
<PAGE>

We are growing rapidly and effectively managing our growth may be difficult.

   Our business model depends on the rapid growth of ITXC.net. The failure to
manage our growth effectively could have a material adverse effect on our
business, financial condition, operating results and future prospects. We have
grown and expect to continue to grow rapidly both by adding new voice-enabled
services and expanding our existing services. This growth is likely to place a
significant strain on our resources and systems. To manage our growth, we must
implement systems and hire, train and manage our employees. Our management may
not be able to effectively or successfully manage our growth.

We may not be able to expand and upgrade our systems.

   If traffic over ITXC.net continues to increase, it will be necessary for us
to expand and upgrade our technology and network hardware and software. We may
not be able to expand and upgrade our systems and network hardware and software
capabilities to accommodate increased traffic on our network. If we do not
appropriately expand and upgrade our systems and network hardware and software,
our business, financial condition, operating results and future prospects will
be materially adversely affected.

We have no control over the quality and maintenance of the third-party
communications infrastructure on which we rely.

   We have no control over the quality and maintenance of the infrastructure
owned by third parties, including our affiliates, used to carry
telecommunications between our end users and the Internet. Therefore, we may
not be aware that we are relying on third party communications equipment that
has quality or maintenance problems or is obsolete. In addition, we have no
control over whether those third parties are able to upgrade or improve their
equipment.

We may not be able to maintain vendor relationships on which we depend.

   We rely upon equipment and software provided to us by our vendors, most
importantly the gateway equipment and software provided by Lucent Technologies
and VocalTec Communications; our affiliates also rely on such equipment and
software. A gateway is a computer server which translates voice and voice-
related signaling back and forth between a circuit-switched network and a data
network. We or our affiliates may not be able to continue to purchase gateways
from these vendors on acceptable terms or at all. If we or our affiliates are
unable to maintain current purchasing terms with these vendors, our business,
financial condition, operating results and future prospects could be materially
adversely affected.

Failure to attract and retain affiliates and customers will harm our business.

   If we are unable to attract and retain affiliates and customers, the traffic
on ITXC.net may not increase and we may not be able to increase our global
reach. Our ability to attract and retain affiliates and customers will depend
on a number of factors, including:


                                       6
<PAGE>

    .  our ability to reach agreement with telecommunications companies,
       telephony resellers and Internet service providers regarding the
       terms and conditions applicable to our business relationship;

    .  our success in marketing our services to potential new and existing
       affiliates and customers;

    .  pricing by traditional carriers;

    .  the rate at which we are able to deploy our network and services;

    .  our ability to locate qualified foreign affiliates and call
       termination providers;

    .  consolidation in the telecommunications industry; and

    .  the quality of the customer and technical support we provide.

Fluctuations in our operating results may negatively impact our stock price.

   We expect that our quarterly operating results will fluctuate significantly.
If our operating results in one or more quarters do not meet industry analysts'
or your expectations, the price of our common stock could be materially
adversely affected.

The loss of a significant customer will reduce our revenues.

   The loss of any significant customer could have a material adverse effect on
our business, financial condition, operating results and future prospects. To
date, we have derived a significant portion of our revenue from a small number
of customers. During 1998, our 10 largest customers accounted for approximately
85% of our revenue. ABT Computer, Inc., a telecommunications reseller and our
largest customer for the year ended December 31, 1998, accounted for 25% of our
revenue during that year. Other large customers include AT&T, which accounted
for all of our consulting revenue for the year ended December 31, 1998, and
IDT, an international carrier and Internet service provider, which accounted
for 16% of our total revenue for 1998. Moreover, our existing customers may not
continue to engage us in the future.

The lack of interoperability among hardware produced by different vendors may
limit our ability to grow a worldwide, fully interoperable network.

   Unless an interoperability standard is widely adopted and used by
manufacturers of gateways and other hardware, ITXC.net's growth will be
limited. Our business model depends on the growth of ITXC.net. Without a widely
adopted interoperability standard, terminators of voice traffic over the
Internet will continue to be required to only accept voice traffic which was
originated on gateways made by the same manufacturer as their terminating
gateway.

                                       7
<PAGE>


If the iNOW! interoperability initiative or another similar initiative is not
widely adopted and implemented, our network may not grow and our business could
be adversely affected.

New interoperability standards may develop without our participation and
adversely affect our market leadership.

   A standard for the interoperability of Internet voice services and products
other than iNOW! may be developed without our participation. If that happens,
we could lose the ability to exploit our leadership in the development of
interoperability standards.

Intense price competition could reduce the demand for our service.

   We may not be able to compete successfully in the developing Internet
telephony market. Many of our competitors are larger than us and have
substantially greater financial resources than we do. The market for our
services has been extremely competitive and is expected to be so for the
foreseeable future. Internet protocol and Internet telephony service providers
such as AT&T Global Clearinghouse, GRIC Communications, and VIP Calling route
traffic to destinations worldwide and compete directly with us. Other internet
telephony service providers focus on a retail customer base and may in the
future compete with us. In addition, major telecommunications companies such as
AT&T, Deutsche Telekom, MCI Worldcom and Qwest Communications, have all entered
or plan to enter the Internet telephony market. See "Our Business--
Competition."

We may not be able to keep up with rapid technological change in the Internet
telephony market in a cost-effective way.

   Our market is characterized by rapid technological change and frequent new
product and services announcements such as, new hardware and software entrants
and releases. Significant technological changes could render the technology we
use obsolete. If we are unable to successfully respond to these developments or
do not respond in a cost-effective way, our business, financial condition,
operating results and future prospects will be materially adversely affected.

We may need additional capital in the future and it may not be available on
acceptable terms.

   The development of our business may require significant additional capital
in the future. Additional financing may not be available on terms favorable to
us, or at all. If adequate funds are not available on acceptable terms, we may
be forced to curtail or cease our operations. To date, our cash flow from
operations has been insufficient to cover our expenses and capital needs. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources."

                                       8
<PAGE>


Foreign political and economic instability could harm our ability to maintain a
global presence.

   Foreign political and economic instability could harm our ability to
maintain a global presence due to:

  .  potentially longer payment cycles;

  .  difficulty in accounts receivable collection;

  .  weaknesses in particular foreign economies;

  .  changes in diplomatic and trade relationships;

  .  foreign taxes; and

  .  the burdens of complying with a variety of foreign laws, trade
     standards, tariffs and trade barriers.

Damage to our network could interrupt our service.

   Any damage to or failure of the Internet, Internet connections, or our
affiliates' computer hardware and software, whether from natural disasters,
equipment failure or intentional acts of vandalism could have a material
adverse effect on our ability to provide our service and on our reputation.

Our proprietary rights may be difficult to protect.

   Our efforts to protect our intellectual property rights through patent,
copyright, trademark and trade secret laws in the United States and in other
countries may not prevent misappropriation, and our failure to protect our
proprietary rights could materially adversely affect our business, financial
condition, operating results and future prospects.

   A third party could, without authorization, copy or otherwise appropriate
our proprietary network information. Our agreements with employees and others
who participate in development activities could be breached, we may not have
adequate remedies for any breach, and our trade secrets may otherwise become
known or independently developed by competitors. See "Our Business--Proprietary
Rights."

Acquisitions may disrupt our business and divert the attention of our
management.

   Investments we may make in complementary companies, technologies and assets,
could disrupt our ongoing business, distract our management and other resources
and make it difficult to maintain our standards, controls and procedures.

   We also may not be able to successfully integrate the services, products and
personnel of any acquisition into our operations. We may be required to incur
debt or issue equity securities, which may be dilutive to you, to pay for
acquisitions. Our acquisitions may not result in any return, or a sufficient
return, on our investment and we may lose all or a substantial portion of our
investment.

                                       9
<PAGE>


We depend heavily on our key management and technical personnel.

   Our future success depends, in part, on the continued service of our key
management and technical personnel, including Tom I. Evslin, John G. Musci, and
Edward B. Jordan, three of our senior executive officers. If any of those
individuals were unable or unwilling to continue in their present positions,
our business, financial condition, operating results and future prospects could
be materially adversely affected. We do not carry key person life insurance on
our personnel, other than Mr. Evslin, and only Messrs. Evslin and Musci have
employment agreements.

We may have difficulty attracting and retaining the skilled employees we need
to execute our growth plan.

   From time to time we have experienced, and we expect to continue to
experience in the future, difficulty in hiring and retaining highly skilled
employees. Our future success depends on our ability to attract, retain and
motivate highly skilled employees, particularly engineering and technical
personnel. Competition for employees in our industry is intense. We may not be
able to retain our key employees or attract, assimilate or retain other highly
qualified employees in the future.

Year 2000 compliance efforts and uncorrected errors could interrupt our
business and subject us to claims.

   Our year 2000 compliance efforts may involve significant time and expense,
and uncorrected problems could materially and adversely affect our business,
financial condition, results of operations, liquidity and future prospects. We
may face claims based on year 2000 issues arising from the integration of
multiple products, including ours, within an overall system.

   In addition, we rely on networks and computer hardware and software, some of
which may not be year 2000 compliant. To the extent our vendors and suppliers
fail to certify that they are year 2000 compliant, we may find it necessary to
terminate our relationships with them. If we terminate these relationships, we
may not be able to find suitable replacement vendors or suppliers on terms
favorable to us, or at all.

   We do not currently have a contingency plan to deal with the worst-case
scenario that might occur if technologies we are dependent upon are not year
2000 compliant and fail to operate effectively after the year 2000. For
information regarding our efforts to prepare for year 2000 issues. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Year 2000."

If we are required to purchase the 51% interest of our South American joint
venture that we do not presently own, your holdings and our liquidity could be
adversely impacted.

   In connection with the formation of our South American joint venture, we
entered into a buyout agreement with the other parties to the joint venture. If
we exercise our right to purchase the interests of these parties under the
buyout agreement, they may elect to receive

                                       10
<PAGE>


cash or our common stock. The amount of the purchase price could be substantial
and, if we exercise our rights and these parties elect to receive cash, the
payment of such purchase price could materially adversely impact our liquidity.
If we pay these parties in common stock, you may incur substantial dilution. We
may not have the capital necessary to fund a purchase of joint venture
interests that we would otherwise desire to make.

Government regulation and legal uncertainties could harm us.

   Our business, financial condition, operating results and future prospects
could be materially adversely affected if Congress, the Federal Communications
Commission, state regulatory authorities, foreign governments or other bodies
begin to regulate or, in the case of certain foreign governments, prohibit
Internet telephony.

   United States. Although our services are not currently regulated by the FCC,
aspects of our operations may be subject to state or federal regulation in the
future. Increased regulation of the Internet may slow its growth, and impact
our cost of providing our service over the Internet. In addition, the FCC may
in the future impose surcharges or other regulations upon us which could
materially adversely affect our business, financial condition, operating
results and future prospects.

   International. Increased regulation of the Internet and/or Internet
telephony providers or the prohibition of Internet telephony in one or more
foreign countries could materially adversely affect our business, financial
condition, operating results and future prospects.

   Our failure to qualify to do business in a foreign jurisdiction in which we
are required to do so or to comply with foreign laws and regulations could harm
our ability to conduct international operations.

   Additionally, it is possible that laws--new or already in existence--may be
applied by the U.S. and/or other countries to transport services provided over
the Internet, including laws governing:

  .  sales and other taxes;

  .  user privacy;

  .  pricing controls;

  .  characteristics and quality of products and services;

  .  consumer protection;

  .  cross-border commerce, including laws that would impose tariffs, duties
     and other import restrictions; and

  .  other claims based on the nature and content of Internet materials,
     including claims of defamation, negligence and the failure to meet
     necessary obligations.


                                       11
<PAGE>


The beneficial ownership of a significant amount of our common stock by our
directors and officers could delay or prevent a change in control of ITXC.

   The concentrated beneficial ownership of our common stock could delay or
prevent a change in control of ITXC that might otherwise be beneficial to you.
Immediately after the closing of the offerings, our executive officers and
directors and their respective affiliates will beneficially own
approximately  % of our outstanding common stock. Accordingly, these
stockholders will be able to exert significant influence over matters requiring
approval by our stockholders, including the election of directors and the
approval of mergers or other business combinations.

You are relying on our management's broad discretion in using the proceeds of
these offerings.

   You are relying on our management's broad discretion in using the proceeds
of these offerings as well as over the timing of their expenditure, with only
limited information about their specific intentions.

Our certificate of incorporation and bylaws and Delaware law will contain
provisions that could discourage a takeover.

   Provisions of our certificate of incorporation and by-laws and Delaware law
may discourage, delay or prevent a merger or acquisition that you may consider
favorable. These provisions of our certificate of incorporation and by-laws
will:

  .  establish a classified board of directors in which only a portion of the
     total number of directors will be elected at each annual meeting;

  .  authorize the board to issue preferred stock;

  .  prohibit cumulative voting in the election of directors;

  .  limit the persons who may call special meetings of stockholders;

  .  prohibit stockholder action by written consent; and

  .  establish advance notice requirements for nominations for the election
     of the board of directors or for proposing matters that can be acted on
     by stockholders at stockholder meetings.

If we or our existing shareholders sell additional shares of our common stock
after the offerings, it could hurt the market price of our common stock.

   If our principal stockholders sell a substantial number of shares of common
stock after the offerings, those sales could adversely affect the market price
of our common stock and could impair our ability to raise capital through the
sale of equity securities.

   Upon the closing of the offerings, we will have      shares of common stock
outstanding including the 9,095,079 shares of common stock to be issued upon
the conversion of the Series B preferred stock and the Series C preferred
stock. In addition, we have reserved for issuance 3,620,597 shares of common
stock issuable under our stock

                                       12
<PAGE>


incentive plan, 250,000 shares of common stock issuable under our employee
stock purchase plan and 439,883 shares of common stock issuable upon exercise
of outstanding warrants.

   The      shares,      shares if the over-allotment option is exercised in
full sold in the offerings will be freely transferable without restriction
under the Securities Act of 1933, unless they are held by "affiliates" of ours
as that term is used under the Securities Act. The     remaining outstanding
shares will be restricted securities as that term is defined in Rule 144; of
these restricted securities, all but     shares will be subject to the volume
restrictions of Rule 144. Substantially all of these restricted securities are
entitled to demand and piggyback registration rights under certain
circumstances.

   We intend to file a registration statement on Form S-8 under the Securities
Act approximately ninety days after the offerings are completed in order to
register shares of common stock reserved for issuance under our stock incentive
plan. This will further dilute your holdings.

The value of shares of common stock purchased in the offerings will be diluted.

   Persons purchasing shares of common stock in the offerings will incur
immediate and substantial dilution in net tangible book value per share. In
addition, to the extent that outstanding options and warrants to purchase
common stock are exercised, there could be substantial additional dilution. See
"Dilution."

An active and liquid market for our common stock may not develop.

   If an active and liquid market for our common stock does not develop,
stockholders may not be able to freely sell their shares. Prior to the
offerings, there has been no public market for our common stock. We cannot
predict the extent to which investor interest in us will lead to the
development of an active trading market in our common stock or how liquid that
market might become. The initial public offering price for our shares will be
determined by negotiations between us and the representatives of the
underwriters and may not be indicative of prices that will prevail in any
future trading market.

Stock price volatility may result in costly litigation against us.

   We would incur substantial costs and our management's attention would be
diverted if we were the object of securities class action litigation. In the
past, companies that have experienced volatility in the market price of their
stock have been the object of securities class action litigation. The market
prices of the securities of Internet-related companies have been especially
volatile.


                                       13
<PAGE>

This prospectus contains forward-looking statements that may not be accurate
indicators of future performance.

   Certain statements under the captions "Prospectus Summary," "Risk Factors,"
"Use of Proceeds," "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and "Our Business" and elsewhere in this prospectus
are forward-looking statements. These forward-looking statements include, but
are not limited to, statements about our plans, objectives, expectations and
intentions and other statements contained in the prospectus that are not
historical facts. When used in this prospectus, the words "expects,"
"anticipates," "intends," "plans," "believes," "seeks" and "estimates" and
similar expressions are generally intended to identify forward-looking
statements. Because these forward-looking statements involve risks and
uncertainties, there are important factors that could cause actual results to
differ materially from those expressed or implied by these forward-looking
statements. These factors consist primarily of the risks identified under "Risk
Factors."

                                       14
<PAGE>

                                USE OF PROCEEDS

   We estimate that the net proceeds from the offerings will be approximately
$  million, or $  million if the underwriters exercise their over-allotment
option in full, assuming an initial public offering price of $  per share and
after deducting the estimated underwriting discounts and offering expenses.

   We estimate that:

  .  approximately $    million of the net proceeds will be used to fund
     capital expenditures and operating expenses to expand our network and
     improve our technology; and

  .  approximately $    million of the net proceeds will be used to finance
     increased sales and marketing expenses focused primarily upon
     international expansion.

   The actual amounts may vary due to:

     .  the status of our efforts to develop new services;

     .  the demands placed upon our existing technology;

     .  the market response to our business initiatives; and

     .  our need to respond to technological and competitive developments.

   We intend to use a portion of the net proceeds from the offerings to repay
approximately $1.7 million of debt outstanding under our line of credit. Our
credit agreement provides both for a revolving line of credit which expires in
August 1999 and an equipment sub-line of credit which expires in 2002, three
years after the last draw down. Borrowings under the revolving line of credit
bear interest at a rate per annum equal to the higher of our lender's published
prime rate plus 0.5% and the weighted average federal funds rate available to
our lender plus 1.5%. Borrowings under the equipment sub-line of credit bear
interest at a rate per annum equal to the higher of our lender's published
prime rate plus 0.75% and the weighted average federal funds rate available to
our lender plus 2.0%. Our credit agreement contains a mandatory repayment
provision which requires us to repay the outstanding indebtedness upon
consummation of the offerings. We have used the amounts borrowed under our
credit agreement for working capital purposes.

   We may also use a portion of the net proceeds to acquire complementary
businesses or technologies, although we currently do not have any agreements
and we are not involved in any negotiations with respect to any such
transactions.

   The balance of the net proceeds will be used for general corporate purposes.


   Pending such uses, we intend to invest the net proceeds in direct or
guaranteed obligations of the United States, interest-bearing, investment-grade
instruments or certificates of deposit.

   Since we cannot specify with certainty the precise manner in which the net
proceeds will be allocated, our management will have broad discretion in the
application of the net proceeds.


                                       15
<PAGE>

                                DIVIDEND POLICY

   We have never declared or paid any dividends on our common stock. We do not
anticipate paying any cash dividends in the foreseeable future. We currently
intend to retain future earnings, if any, to finance operations and the
expansion of our business. Any future determination to pay cash dividends will
be at the discretion of the board of directors and will depend upon our
financial condition, operating results, capital requirements and other factors
the board of directors deems relevant. In addition, our credit agreement
restricts our ability to declare and pay dividends without the consent of our
lender.

                                       16
<PAGE>

                                 CAPITALIZATION

   The following table sets forth our cash and cash equivalents, short-term
debt and capitalization as of March 31, 1999. This unaudited information is
presented:

  .  on an actual basis;

  .  after giving pro forma effect to the conversion of our outstanding
     preferred stock and the June 11, 1999 exercise of warrants covering
     722,000 shares of common stock by a principal stockholder; and

  .  as further adjusted to reflect our receipt and application of the
     estimated net proceeds from the sale of     shares of common stock
     offered in the offerings at an assumed initial public offering price of
     $   per share and after deducting the estimated underwriting discounts
     and offering expenses, and the use of approximately $1.7 million of net
     proceeds of the offerings to repay all outstanding indebtedness on our
     line of credit.

   Please read the capitalization table together with the sections of this
prospectus entitled "Selected Historical Financial Data," "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
the consolidated financial statements included in this prospectus.

<TABLE>
<CAPTION>
                                                      As of March 31, 1999
                                                  ------------------------------
                                                  Actual   Pro Forma As Adjusted
                                                  -------  --------- -----------
                                                    (in thousands, unaudited)
<S>                                               <C>      <C>       <C>
Cash and cash equivalents.......................  $16,509   $16,510    $
                                                  =======   =======    =======
Equipment note payable..........................  $ 1,723   $ 1,723    $   --
Capital lease obligations, less current portion
 ...............................................      137       137        137
Series B redeemable convertible preferred stock,
 5,865,104 shares issued and outstanding; no
 shares issued and outstanding pro forma and as
 adjusted.......................................    9,872       --         --
Series C redeemable convertible preferred stock,
 3,229,975 shares issued and outstanding; no
 shares issued and outstanding pro forma and as
 adjusted.......................................   15,040       --         --
Stockholders' equity:
  Preferred stock, $0.001 par value; no shares
   issued and outstanding, pro forma and as
   adjusted.....................................      --        --         --
  Common stock, $0.001 par value; 22,500,000
   shares authorized; 4,190,500 shares issued
   and outstanding; 14,007,579 shares issued and
   outstanding pro forma;            shares
   issued and outstanding as adjusted...........        4        14
  Additional paid-in capital....................    3,650    28,552
  Deferred employee compensation................   (2,212)   (2,212)    (2,212)
  Accumulated deficit...........................  (10,425)  (10,425)   (10,425)
                                                  -------   -------    -------
  Total stockholders' equity (deficit)..........  $(8,983)  $15,929    $
                                                  =======   =======    =======
Total capitalization............................  $17,789   $17,789    $
                                                  =======   =======    =======
</TABLE>

                                       17
<PAGE>

                                    DILUTION

   As of March 31, 1999, our net tangible book value, after giving pro forma
effect to the conversion of our outstanding preferred stock and the June 11,
1999 exercise of warrants covering 722,000 shares of common stock, was
$14,959,696, or $1.07 per share of common stock. Net tangible book value per
share represents the amount of our total tangible assets reduced by the amount
of our total liabilities, divided by the number of shares of common stock
outstanding. As of March 31, 1999, our net tangible book value, as further
adjusted for the sale of      shares offered in the offerings at an assumed
initial public offering price of $  per share, after deducting the estimated
underwriting discounts and offering expenses, would have been approximately $
per share of common stock. This represents an immediate increase of $    per
share to existing stockholders and an immediate dilution of $    per share to
new investors. The following table illustrates this per share dilution:

<TABLE>
<CAPTION>
                                                                          Per
                                                                         Share
                                                                         ------
<S>                                                                      <C>
Assumed initial public offering price per share......................... $
Pro forma net tangible book value per share as of March 31, 1999........   1.07
                                                                         ======
Increase per share attributable to new investors........................
Pro forma net tangible book value per share after the offerings.........
                                                                         ------
Dilution per share to new investors..................................... $
                                                                         ======
</TABLE>

   The following table sets forth the number of shares of common stock
purchased from ITXC, the total consideration contributed and the average price
per share contributed by existing stockholders and by new investors. The
following table assumes the issuance by ITXC of      shares in the offerings at
an assumed initial public offering price of $  per share, before deducting the
estimated underwriting discounts and offering expenses. The following table
also gives effect to the conversion of our outstanding preferred stock and the
June 11, 1999 exercise of warrants covering 722,000 shares of common stock.

<TABLE>
<CAPTION>
                              Shares Purchased      Total Consideration
                            -------------------- -------------------------- -----------
                                        Percent          Percent   Average
                                         After            After     Price
                              Number   Offerings Amount Offerings Per Share
                            ---------- --------- ------ --------- ---------
                                        (dollars in thousands)
   <S>                      <C>        <C>       <C>    <C>       <C>       <C> <C> <C>
   Existing stockholders... 14,007,579       %    $           %      $
   New investors...........
                            ----------    ---     ---      ---
   Total...................               100%    $        100%
                            ==========    ===     ===      ===
</TABLE>

                                       18
<PAGE>

                       SELECTED HISTORICAL FINANCIAL DATA

   The following selected financial data for the period from July 21, 1997, our
date of inception, to December 31, 1997 and for the year ended December 31,
1998 are derived from our audited consolidated financial statements. The
following selected financial data for the quarters ended March 31, 1998 and
1999 are derived from our unaudited financial statements. The unaudited
financial statements include all adjustments, consisting of normal recurring
accruals, which we consider necessary for a fair presentation of our financial
position and results of operations for the interim periods. Our operating
results for the quarter ended March 31, 1999 are not necessarily a reliable
indicator of the results that may be expected for the entire year ending
December 31, 1999. The pro forma line items in the operating data presented
below and the pro forma column in the balance sheet data presented below give
effect to the conversion of all outstanding shares of Series B and Series C
preferred stock into common stock upon the closing of the offerings and the
June 11, 1999 exercise of warrants covering 722,000 shares of our common stock,
as if such conversion and exercise had occurred at the dates of issuance. You
should read the information that we have presented below in conjunction with
our consolidated financial statements, related notes and other financial
information included elsewhere in this prospectus.

<TABLE>
<CAPTION>
                                    Period from
                                   July 21, 1997
                                     (date of                     Quarter
                                   inception) to Year ended   ended March 31,
                                     December     December  -------------------
                                     31, 1997     31, 1998    1998      1999
                                   ------------- ---------- --------- ---------
<S>                                <C>           <C>        <C>       <C>
Operating Data:                       (in thousands, except per share data)
Revenue:
 Telecommunications revenue.......    $  --       $ 1,238    $   --    $ 2,429
 Consulting revenue...............       500          300        300       600
                                      ------      -------    -------   -------
Total revenue.....................       500        1,538        300     3,029
Cost and expenses:
 Data communications and
  telecommunications..............       --         2,017        --      2,528
 Cost of consulting revenue.......       --           192         30       --
 Network operations...............       --         1,321        167       546
 Sales and marketing..............       349        2,518        375     1,009
 Development......................       --           594         54       183
 General and administrative.......       352        2,009        287     1,367
 Depreciation and amortization....         5          345         19       278
 Non-cash employee compensation...       --           --         --        104
                                      ------      -------    -------   -------
Total costs and expenses..........       706        8,995        931     6,014
                                      ------      -------    -------   -------
Loss from operations..............      (206)      (7,457)      (631)   (2,985)
                                      ------      -------    -------   -------
Interest income...................         1          231        --         69
Interest expense..................       --           (50)       --        (27)
                                      ------      -------    -------   -------
Net loss..........................      (205)      (7,276)      (631)   (2,944)
Accretion of redemption value of
 mandatorily redeemable
 convertible preferred stock......                    (14)                (113)
                                                  -------              -------
Net loss applicable to common
 stockholders.....................    $ (205)     $(7,290)   $  (631)  $(3,057)
                                      ======      =======    =======   =======
Basic and diluted net loss per
 share applicable to common
 stockholders.....................    $(0.06)     $ (1.78)   $ (0.16)  $ (0.73)
                                      ======      =======    =======   =======
Weighted average shares used in
 computation of basic and diluted
 net loss per share applicable to
 common stockholders..............     3,502        4,092      3,900     4,191
Pro forma basic and diluted net
 loss per share (unaudited).......                $ (0.83)             $ (0.24)
                                                  =======              =======
Weighted average shares used in
 computation of pro forma basic
 and diluted net loss per share
 (unaudited)......................                  8,799               12,034
<CAPTION>
                                         December 31,                 Pro forma
                                   ------------------------ March 31, March 31,
                                       1997         1998      1999      1999
                                   ------------- ---------- --------- ---------
<S>                                <C>           <C>        <C>       <C>
Balance Sheet Data:
Cash, cash equivalents and short-
 term investments.................    $  498      $ 4,171    $16,709   $16,710
Total assets......................       795        7,834     22,015    22,016
Long-term obligations, including
 current portion..................                  1,437      1,936     1,936
Working capital...................       214        2,157     13,518    13,519
Total stockholders' equity (defi-
 cit).............................       493       (6,030)    (8,983)   15,929
</TABLE>

                                       19
<PAGE>

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

Overview

   We are a leading global provider of Internet-based voice, fax and voice-
enabled services. From our inception in July 1997 through April 1998, our
operating activities were focused primarily on:

  .  developing monitoring and analysis software to enable us to efficiently
     and cost effectively route voice over the Internet which we refer to as
     BestValue Routing;

  .  developing relationships with affiliates throughout the world to
     increase the global reach of ITXC.net;

  .  developing additional business strategies to supplement our affiliate
     network; and

  .  hiring our initial employee group.

   In April 1998, we launched our first service delivered over ITXC.net--our
WWeXchange service. Our operations since that time have included:

  .  increasing our voice traffic, from 2,746 minutes during April 1998 to
     approximately 7.5 million minutes during May 1999;

  .  refining our monitoring and analysis software in order to achieve
     BestValue Routing;

  .  expanding our affiliate network to 54 affiliates at June 10, 1999 and
     increasing the global reach of ITXC.net; and

  .  increasing our employee headcount, from 29 employees on April 1, 1998 to
     76 employees on June 10, 1999.

   Our primary sources of revenue have been the fees that we receive from
customers for terminating calls that they have originated on the Internet. To
date, our revenue for terminating calls over ITXC.net has depended primarily
upon the volume of voice traffic carried over ITXC.net, which is measured in
terms of minutes of voice traffic. We have also received consulting revenue
derived from a market trial agreement that we entered into with a third-party
shortly after our inception in order to generate funds to sustain operations.
Under that agreement, we earned revenue as we met specific milestones. We do
not consider it likely that consulting revenue will continue beyond the quarter
ending June 30, 1999. To date, we have derived a significant portion of our
revenue from a small number of customers. The loss of a major customer could
have a material adverse effect on our business, financial condition, operating
results and future prospects.

   Our operating expenses have been primarily:

  .  Data Communications and Telecommunications Expenses. Internet-related
     expenses, consisting primarily of:

    .  costs associated with sending voice traffic over the Internet,
       primarily fees that we pay to our affiliates to terminate or assist
       us in terminating calls, fees that we

                                       20
<PAGE>

       pay when we find it necessary to utilize the circuit-switched network
       or private data networks to terminate calls and expenses incurred in
       connecting our customers to our network; these expenses are largely
       proportional to the volume of voice traffic carried over our network;
       and

    .  costs associated with buying Internet access at ITXC-operated
       locations; these costs are largely proportional to the bandwidth of
       access available and do not typically vary based upon volume.

  .  Network Operations Expenses. Expenses associated with operating the
     network, consisting primarily of the salaries, payroll taxes and
     benefits that we pay for those employees directly involved in the
     operation of ITXC.net and related expenses.

  .  Sales and Marketing Expenses. Expenses relating to the salaries, payroll
     taxes, benefits and commissions that we pay for sales personnel and
     expenses associated with the development and implementation of our
     promotion and marketing campaigns. We anticipate that sales and
     marketing expenses will increase in the future as we expand our internal
     sales force, hire additional marketing personnel and increase
     expenditures for promotion and marketing. We expect that such expenses
     will also increase as telecommunications revenue increases.

  .  Development Expenses. Salary, payroll tax and benefit expenses that we
     pay for employees and consultants who work on the development of our
     network management approaches and future applications of our technology.
     We believe that investing in the enhancement of our technology is
     critical to our future success. We expect that our development expenses
     will increase in future periods, based upon various factors, including:

    .  the importance to us of BestValue Routing;

    .  the pace of technological change in our industry; and

    .  our goal of expanding the applications of our technology.

  .  General and Administrative Expenses. Salary, payroll tax and benefit
     expenses and related costs for general corporate functions, including
     executive management, administration, facilities, information technology
     and human resources. We expect that general and administrative expenses
     will increase in the future as we hire additional personnel and incur
     additional costs related to the growth of our business and operations.
     In addition, we expect to expand our facilities and incur associated
     expenses to support our anticipated growth.

  .  Non-cash Employee Compensation Expenses. Non-cash employee compensation
     represents compensation expense incurred in connection with the grant of
     certain stock options to our employees with exercise prices less than
     the fair value of our common stock at the respective dates of grant.
     During the quarter ended March 31, 1999 we granted options to purchase
     1,047,875 shares of common stock at exercise prices less than fair value
     resulting in non-cash charges of approximately $2.3 million . Such
     charges will be expensed, generally over the next three to seven years,
     in connection with the underlying vesting periods of the options
     granted.


                                      21
<PAGE>


   We believe that the services we provide over the Internet are not currently
actively regulated in the United States. Several efforts have been made,
however, to enact federal legislation that would regulate certain aspects of
the Internet. If adopted, such legislation could increase our costs
significantly and could materially adversely affect our business, operating
results, financial condition and future prospects. See "--Our Business--
Government Regulation."

   Since our inception in July 1997, we have experienced operating losses in
each quarterly and annual period and negative cash flows from operations in
each quarter since we commenced offering services over ITXC.net in April 1998.
As of March 31, 1999, we had an accumulated deficit of $10.4 million. The
profit potential of our business is unproven, and our limited operating history
makes an evaluation of us and our prospects difficult. We may not achieve
profitability or, if we achieve profitability, we might not sustain
profitability. See "Risk Factors."

Results of Operations

Comparison of the Quarters Ended March 31, 1998 and 1999

   Revenue

   We did not commence commercial services over ITXC.net until the quarter
ended June 30, 1998. Accordingly, we did not have any revenue for terminating
calls during the quarter ended March 31, 1998. Our telecommunications revenue
for the quarter ended March 31, 1999 of $2.4 million was nearly double the
amount of telecommunications revenue that we generated during the eight months
of 1998 when ITXC.net was operational.

   We increased our consulting revenue from $300,000 during the quarter ended
March 31, 1998 to $600,000 during the quarter ended March 31, 1999, reflecting
the accomplishment of various performance requirements under our market trial
agreement during each such period. We believe that we have now satisfied all of
the performance requirements under our market trial agreement and that our
anticipated consulting revenue of $300,000 for the quarter ending June 30, 1999
will represent the final revenue under that agreement. We do not expect to earn
significant consulting revenue in subsequent periods.

   Operating Expenses

   Data Communications and Telecommunications Expenses. We did not incur data
communications and telecommunications expenses until we began providing service
over ITXC.net in April 1998. Accordingly, we did not incur any such expenses
during the quarter ended March 31, 1998. During the quarter ended March 31,
1999, such expenses amounted to $2.5 million, compared to telecommunications
revenue of $2.4 million. The ratio of such expenses to telecommunication
revenue reflects our early stage of operations: we have not yet reached a point
where significant economies of scale can be realized from an increased volume
of traffic.


                                       22
<PAGE>


   Cost of Consulting Revenue. We did not incur any material expenses under our
market trial agreement during any of the periods described in this prospectus.
During the quarter ended March 31, 1998, such costs represented 10% of
consulting revenue. We did not incur these expenses during the quarter ended
March 31, 1999 since the substantive work required to meet the final
performance milestones was completed during 1998. During the quarter ended
March 31, 1999, we presented an update report.

   Network Operations Expenses. Network operations expenses increased from
$167,000 during the quarter ended March 31, 1998 to $546,000 during the quarter
ended March 31, 1999. Expenses during the earlier quarter were incurred in
preparing for the implementation of our WWeXchange service in April 1998.
During the quarter ended March 31, 1999, such expenses reflected the cost of
operating our 24-hours-a-day, 7 days-a-week network operations center and
represented 22.5% of telecommunications revenue.

   Sales and Marketing Expenses. Sales and marketing expenses increased from
$375,000 during the quarter ended March 31, 1998 to $1.0 million during the
quarter ended March 31, 1999. This increase primarily represents personnel
costs associated with the hiring of additional sales and marketing employees
and commissions paid on the telecommunications revenue that we generated during
the quarter ended March 31, 1999.

   Development Expenses. Development expenses increased from $54,000 during the
quarter ended March 31, 1998 to $183,000 during the quarter ended March 31,
1999, reflecting the costs of additional personnel and consultants for
development tasks.

   General and Administrative Expenses. Our general and administrative expenses
increased from $287,000 during the quarter ended March 31, 1998 to $1.4 million
during the quarter ended March 31, 1999. These increases were primarily due to
an increase in salaries and benefits, recruiting costs and facilities expenses
resulting from the growth in our business and facilities, as well as an
increase in the number of general and administrative personnel hired to support
our growth.

   Non-cash Employee Compensation Expenses. Non-cash employee compensation
expense amounted to $104,000 during the quarter ended March 31, 1999
representing amortization of deferred compensation incurred in connection with
the grant of options at exercise prices less than fair value. There was no non-
cash employee compensation expense during the quarter ended March 31, 1998.

   Interest Income, Net

   Our interest income, net principally represents income from our cash and
investments which, in turn, were derived from capital contributions made by our
investors. In addition to the initial capital invested near the inception of
our business, we raised net proceeds of $9.9 million and $14.9 million from a
group of investors in transactions completed during April 1998 and February
1999, respectively. See "Certain Transactions." The interest generated from
these capital contributions exceeded the interest that we paid on our line of
credit by $41,000 during the quarter ended March 31, 1999. We had no such
income or expense during the quarter ended March 31, 1998.

                                       23
<PAGE>

   Loss From Operations

   We incurred operating losses of $631,000 and $3.0 million during the
quarters ended March 31, 1998 and 1999, respectively. We do not consider these
amounts to be comparable, since the first amount reflects operations prior to
the introduction of services over our network, while the latter figure reflects
our active operation of our network. We anticipate that we will incur
additional operating and net losses for the foreseeable future. The amount of
these losses may exceed the amount of the losses that we have incurred in prior
quarterly and annual periods.

   Comparison of the Inception Period from July 21, 1997 to December 31, 1997
and the Year Ended December 31, 1998

   Revenue

   We did not have any revenue for terminating calls during the inception
period. Our telecommunications revenue for the year ended December 31, 1998,
reflecting operations from April 1998 to year-end, was $1.2 million.

   Our consulting revenue declined from $500,000 during the inception period to
$300,000 during the year ended December 31, 1998, reflecting the timing of the
performance thresholds under our market trial agreement. We do not expect to
earn substantial consulting revenue in subsequent periods.

   Operating Expenses

   Data Communications and Telecommunications Expenses. We did not incur any
data communications and telecommunications expenses during the inception
period. During the year ended December 31, 1998, such expenses amounted to $2.0
million, as compared to telecommunications revenue of $1.2 million during that
period. During the initial period of operations, it was necessary for us to
rely upon the circuit-switched and private data networks more than we currently
do, since we had fewer affiliates at that juncture. We also had not reached a
point where significant economies of scale could be realized.

   Cost of Consulting Revenue. The cost of consulting revenue amounted to
$192,000 during the year ended December 31, 1998 which represented 64% of
consulting revenue. We did not incur any such expenses during the inception
period.

   Network Operations Expenses. We did not incur any network operations
expenses during the inception period. During the year ended December 31, 1998,
such expenses amounted to $1.3 million, which represented 107% of our
telecommunications revenue during that period. Network operations expenses are
not proportional to the volume of our traffic; regardless of our volume, we
were required to pay the salaries and related costs associated with operating
our network operations center.

   Sales and Marketing Expenses. Sales and marketing expenses increased from
$349,000 during the inception period to $2.5 million during the year ended
December 31, 1998. This increase reflects enhanced sales and marketing efforts
that we undertook once our network

                                       24
<PAGE>

was operating, a growth in our sales and marketing staffs and commissions paid
on the telecommunications revenue that we generated during the year ended
December 31, 1998.

   Development Expenses. We did not incur development expenses during the
inception period. We recorded $594,000 of such expenses during the year ended
December 31, 1998, reflecting our hiring of employees and engaging of
consultants for development tasks.

   General and Administrative Expenses. Our general and administrative expenses
increased from $352,000 during the inception period to $2.0 million during the
year ended December 31, 1998. These increases were primarily due to an increase
in salaries and benefits, recruiting costs and facilities expenses resulting
from the growth in our business and facilities, as well as from a substantial
increase in the number of general and administrative personnel hired to support
our growth.

   Non-cash Employee Compensation Expenses. We did not incur any non-cash
employee compensation expenses during the inception period or the year ended
December 31, 1998.

   Interest Income, Net

   The interest generated primarily from our April 1998 private placement
exceeded by $181,000 the interest that we paid on our line of credit during the
year ended December 31, 1998. Our interest income was minimal, and we paid no
interest during the period from inception through December 31, 1997.

   Loss From Operations

   We incurred operating losses of $206,000 and $7.5 million during the
inception period and the year ended December 31, 1998, respectively. We do not
consider these amounts to be comparable, since the first amount reflects
operations prior to the introduction of services over our network, while the
latter figure reflects our active operation of our network during our initial
period of operations. We anticipate that we will incur additional operating and
net losses for the foreseeable future.

Liquidity and Capital Resources

   Since our inception in July 1997, we have financed our operations primarily
through the private placement of our capital stock and, to a lesser extent,
through equipment financing. As of March 31, 1999, we had $16.7 million in
cash, cash equivalents and short-term investments.

   Net cash provided by financing activities was $0.5 million for the inception
period in 1997, $11.0 million for the year ended December 31, 1998 and $15.4
million for the quarter ended March 31, 1999 and was primarily attributable to
net proceeds from the issuance of our capital stock.

   Net cash provided by operating activities was negligible for the inception
period. Net cash used in operating activities amounted to $5.3 million for the
year ended December 31,

                                       25
<PAGE>

1998 and $1.4 million for the quarter ended March 31, 1999. Cash used in
operating activities in both of these periods was primarily the result of net
operating losses and increased accounts receivable, partially offset by
increases in accounts payable and accrued expenses.

   Net cash used in investing activities was negligible for the inception
period in 1997, $2.3 million for the year ended December 31, 1998 and $1.5
million for the quarter ended March 31, 1999. Cash used in investing activities
in each period was primarily related to purchases of property and equipment.

   As of March 31, 1999, our principal commitments consisted of obligations
outstanding under operating leases. As of March 31, 1999, future minimum
payments for non-cancelable operating leases having terms in excess of one year
amounted to $479,000, of which $273,000 is payable in 1999 and $206,000 is
payable in 2000. Although we have no material commitments for capital
expenditures, we anticipate a substantial increase in our capital expenditures
and lease commitments consistent with our anticipated growth in operations,
infrastructure and personnel, including the deployment of additional networks
hubs and SNARCs.

   In August 1998, we arranged a revolving line of credit with a financial
institution which provides for maximum borrowings of $5.0 million, of which
$4.0 million may be borrowed under an equipment line of credit for the purchase
of certain capital equipment. This credit agreement is collateralized by
substantially all of our assets. The revolving line of credit has a one year
term that expires in August 1999. The equipment sub-line of credit expires in
2002. As of March 31, 1999, the amount outstanding under the credit agreement
was $1.7 million. The credit agreement includes a mandatory repayment clause
requiring that we repay the balance outstanding in the event we consummate an
initial public offering of our securities with net proceeds of at least $20
million. We intend to repay the entire amount outstanding under this credit
agreement with a portion of the proceeds of the offerings.

   Accrued interest under the revolving line of credit is due in monthly
installments through August 1999. Accrued interest under the equipment sub-line
of credit is due monthly until the principal amount is repaid three years after
the final draw down. Borrowings under the revolving line of credit bear
interest at a rate per annum equal to the higher of our lender's published
prime rate plus 0.5% and the weighted average federal funds rate available to
our lender plus 1.5%. Borrowings under the equipment sub-line of credit bear
interest at a rate per annum equal to the higher of our lender's published
prime rate plus 0.75% and the weighted average federal funds rate available to
our lender plus 2.0%. Amounts outstanding under the credit agreement not paid
when due will bear interest at a default rate equal to 3.0% above the rates
otherwise applicable to the loans made to us. As of December 31, 1998, we were
in violation of one financial covenant under the credit agreement. That
covenant required our current assets to exceed our current liabilities by a
specified multiple, which multiple varies for each quarter through the quarter
ended September 30, 1999. We have obtained a letter from our lender waiving the
violation as of December 31, 1998. As of March 31, 1999, we were in compliance
with all of the financial

                                       26
<PAGE>


covenants under the credit agreement. We expect that we will be able to comply
with those covenants for at least the next twelve months.

   We paid our lender at a one-time facility fee of $25,000 in August 1998.

   We have received a commitment letter from our lender to increase our line of
credit to $10,000,000 upon the closing of our offerings.

   In connection with the formation of our South American joint venture, ITXC
Comunicacoes Ltda., we entered into a buyout agreement with the other parties
to the joint venture. That agreement provides us with certain rights to
purchase the interests of the other parties, and provides the other parties
with certain rights to cause us to purchase their interests, each in a number
of specific circumstances. Our offerings constitute one of these circumstances.
The other parties have waived their rights to cause us to purchase their
interests in the joint venture as a result of our offerings. We maintain the
right to purchase their interests in the joint venture should we desire to do
so shortly after the closing of the offerings. If we elect to purchase their
interests, we will be required to pay a purchase price based on a formula that
cannot be calculated until we know the joint venture's revenue and gross
profits for the six months ended August 31, 1999. We are under no obligation to
exercise our call right in connection with the offerings. If we do exercise our
call right, the other parties to the joint venture agreement will be able to
elect to be paid in cash or in our common stock valued at the initial public
offering price.

   If we do not elect to exercise our call rights in connection with the
offerings, each of the parties will again have its put and call rights in the
event that:

  .  we reach an impasse with our joint venture partners;

  .  we are acquired or enter into certain other business combinations;

  .  ITXC Comunicacoes Ltda. fails to meet certain performance thresholds in
     five South American countries; or

  .  we fail to meet certain performance thresholds in the same countries.

If any of these triggers occur, we will have the right to purchase the
interests of our joint venture partners and our partners will have the
opportunity to exercise their put rights. The purchase price in these
circumstances will either be based upon a formula price, in the case of an
acquisition or other business combination, or an appraisal of the joint
venture's fair market value in all other instances. Under the formula approach,
the joint venture will be valued at a percentage of ITXC's value comparable to
the percentage that the revenues of ITXC Comunicacoes Ltda. represent of our
revenues, subject to certain contractual adjustments based upon the
profitability of the joint venture.

   If our partners exercise their put rights, we will be able to specify
whether they receive cash or our common stock. If we exercise our call rights,
our partners may elect to receive cash or our common stock. The amount of the
purchase price under any of these scenarios could be substantial and, if we
exercise a call right and our partners elect to receive cash, the payment of
such purchase price could materially adversely impact our liquidity. We cannot

                                       27
<PAGE>


assure you that we will have the capital necessary to fund a purchase of joint
venture interests that we would otherwise desire to make.

   Our capital requirements depend on numerous factors, including market
acceptance of our services, the responses of our competitors, the resources we
allocate to ITXC.net and the development of future applications of our
technology, our success in marketing and selling our services, and other
factors. We have experienced substantial increases in our capital expenditures
since our inception, consistent with growth in our operations and staffing, and
we anticipate that our capital expenditures will continue to increase in the
future. Additionally, we will evaluate possible acquisitions of, or investments
in, complementary businesses, technologies or services and plan to expand our
sales and marketing programs. We currently believe that our available cash
equivalents, combined with the net proceeds from the offerings, will be
sufficient to meet our anticipated needs for working capital and capital
expenditures for at least the next 12 months. We may need to raise additional
funds, however, in order to fund more rapid expansion, to develop new or
enhance existing services, to respond to competitive pressures or to acquire or
invest in complementary business, technologies or services. Additional funding
may not be available on favorable terms or at all.

Recent Accounting Pronouncements

   In March 1998, the American Institute of Certified Public Accountants issued
Statement of Position 98-1, "Accounting for the Cost of Computer Software
Developed or Obtained for Internal Use." SOP 98-1 is effective for financial
statements for years beginning after December 15, 1998. SOP 98-1 provides
guidance regarding accounting for computer software developed or obtained for
internal use, including the requirement to capitalize specified costs and
amortization of such costs. We do not expect the adoption of this standard to
have a significant impact on our financial results.

   In April 1998, the American Institute of Certified Public Accountants issued
Statement of Position 98-5, "Reporting on the Costs of Start-Up Activities."
SOP 98-5 is effective for fiscal years beginning after December 15, 1998. SOP
98-5 provides guidance on the financial reporting of start-up costs and
organization costs. It requires the costs of start-up activities and
organization costs to be expensed as incurred. As we expensed these costs as
incurred, we believe that the adoption of this standard will have no impact on
our operating results, financial position or cash flows.

   In June 1998, the Financial Accounting Standards Board issued Statements of
Financial Accounting Standards No. 133, "Accounting for Derivatives and Hedging
Activities." SFAS No. 133 establishes accounting and reporting standards for
derivative instruments, including derivative instruments embedded in other
contracts, and for hedging activities. SFAS No. 133 is effective for all fiscal
quarters of fiscal years beginning after June 15, 1999. As we do not currently
engage in derivatives or hedging transactions, we believe that there will be no
current impact to our results of operations, financial position or cash flows
upon the adoption of SFAS No. 133.


                                       28
<PAGE>

Year 2000 Compliance

   We may be exposed to a loss of revenues and our operating expenses could
increase if the systems on which we are dependent to conduct our operations are
not year 2000 compliant. Our potential areas of exposure include:

  .  services purchased from third parties;

  .  information technology, including computers and software; and

  .  non-information technology, including telephone systems and other
     equipment used internally.

   All areas that we believe are important to our operations are being tested
and validated for year 2000 compliance. Our hardware and software has been
acquired subsequent to July 17, 1997, and hence at a time when manufacturers
were well aware of the Year 2000 issue. Since several of our vendors were
scheduled to release new versions during the second calendar quarter of 1999,
we have deferred certain aspects of our Year 2000 analysis. We intend to
complete our year 2000 compliance assessment plan in the third quarter of 1999
and our compliance testing and related documentation by the end of the third
quarter of 1999. Until our assessment is completed we will not be able to
evaluate whether our systems will need to be revised or replaced, or the cost
involved. However, we do not expect this cost to exceed $1.0 million. We expect
to spend most of the amount on the replacement of readily available hardware
and software. We expect the source of this amount to be working capital or
equipment financing.

   In addition, we are in the process of seeking verification from our key
vendors and suppliers that they are year 2000 complaint. If they are not
presently compliant, we are requesting a description of their plans to become
compliant. To the extent that vendors fail to provide certification that they
are year 2000 compliant, we may find it necessary to terminate and seek to
replace those relationships.

   In the most reasonably likely worst case scenario, year 2000 problems could
adversely impact, and could render inoperative, one or more components in the
infrastructures in some foreign countries. Year 2000 difficulties experienced
in foreign countries or by our affiliates could materially adversely affect our
network. We do not currently have a contingency plan to deal with the worst-
case scenario that might occur if technologies upon which we are dependent are
not year 2000 compliant and fail to operate effectively after the year 2000. We
intend to develop a plan for this scenario upon the completion of our
compliance assessment plan.

   If our present efforts to address year 2000 compliance issues are not
successful, or if distributors, suppliers and other third parties with whom we
conduct business do not successfully address such issues, our financial
condition, operating results, liquidity and future prospects could be
materially adversely affected.

                                       29
<PAGE>

                                  OUR BUSINESS

Overview

   We are a leading global provider of high quality Internet-based voice, fax
and voice-enabled services. Our services allow communications users and service
providers, such as traditional telephone companies, Internet service providers
and data network providers, to capitalize on the convergence of the public
Internet and circuit-switched networks. We believe that our scale, reputation
for high quality and ability to rapidly implement new services addresses the
substantial opportunities that are resulting from this convergence.

   We have developed and deployed ITXC.net, an actively-managed network
overlayed on the public Internet, to deliver high quality voice communications
while providing our customers with the cost savings and global reach of the
Internet. We believe that the rapid growth of commercial traffic on ITXC.net
demonstrates that we have successfully used our proprietary BestValue Routing
to address the quality problems which early attempts at Internet telephony have
encountered.

   To date, we have concentrated our efforts on rapidly deploying ITXC.net
worldwide. We have established ITXC-owned facilities in the U.S. and have
arranged call termination and origination services with affiliates throughout
the world. We have used our affiliate structure to achieve what we believe is
the broadest global network in the Internet telephony marketplace. As of June
10, 1999, we had affiliates in more than 75 international cities operating more
than 110 ITXC.net points of presence. On a typical day, we carry voice traffic
from over 30 countries to more than 140 countries. By using the Internet for
transport and our affiliates' local infrastructure for terminating voice
traffic, we have developed a reliable, scalable network at substantially lower
capital expense than traditional carrier networks.

   In April 1998, we introduced our WWeXchange service, the first application
enabled by ITXC.net. This service provides international call completion to our
customers and enables them to offer their own customers phone-to-phone global
voice service. We have achieved a high network usage growth rate since
commencing our WWeXchange service. The following table sets forth the number of
minutes of voice traffic carried over ITXC.net during the past four quarters:

<TABLE>
<CAPTION>
      Quarter ended                                                    Minutes
      -------------                                                   ----------
      <S>                                                             <C>
      June 30, 1998..................................................     46,700
      September 30, 1998.............................................    643,700
      December 31, 1998..............................................  4,087,100
      March 31, 1999................................................. 11,076,600
</TABLE>

In addition, we carried 4,993,100 and 7,620,400 minutes over ITXC.net during
April 1999 and May 1999, respectively.

   We have recently introduced a new proprietary device called a SNARC, which
we believe will facilitate the use of our network by our customers. These
devices allow our customers to access our network directly from their premises,
avoiding the costs of dedicated

                                       30
<PAGE>

connections to network hubs and improving the economics of our services to
them. We believe that SNARCs will strengthen our customers' relationships with
us and position us to deploy enhanced services.

   In addition to our WWeXchange service, we intend to introduce more advanced
communications applications enabled by ITXC.net. We expect that these services
will allow our customers to offer additional voice-enabled Internet-based
products to their customers. Examples of services we may introduce include:

  .  enhanced phone-to-phone services;

  .  personal computer-to-phone service and phone-to-personal computer
     service;

  .  device-to-phone service and phone-to-device service, including devices
     such as personal digital assistants;

  .  voice-enhanced e-commerce;

  .  unified messaging, combining voice, fax and e-mail communications; and

  .  single telephone number service, in which a single billing and reach me
     number follows the subscriber.

Industry Overview

   Convergence of Global Telecommunications and Data Services

   The global telecommunications industry has grown at a rapid rate over the
last decade, driven by domestic and international deregulation, technological
development, network deployment and the globalization of business. The number
of communications service providers has also been increasing as a result of
competition fostered by domestic and international deregulation. These factors
have contributed to a substantial decrease in the cost of telephony services
delivered over circuit-switched networks. This decrease in price, however, has
been offset by an increase in total revenue driven by the growth in demand that
low prices have created. Based on country-by-country information and other data
provided by the International Telecommunications Union, total
telecommunications services revenue was approximately $700 billion in 1997.
According to Insight Research Corporation, an industry research firm, this
market is projected to grow to approximately $1.3 trillion by 2003. According
to TeleGeography, a market research firm, the total market for international
long distance services in 1997 totalled approximately $65.9 billion.
TeleGeography also expects international long distance traffic to grow from
94.1 billion minutes in 1998 to 143.2 billion minutes in 2001.

   In addition, over the last decade, the volume of traffic on data networks
has grown at an even faster rate. According to TeleGeography, in 1998 data
surpassed voice as the dominant traffic for the U.S. long distance market. This
growth has been driven by several factors, including technological innovation,
high penetration of personal computers and, in particular, by the rapid
expansion of the Internet as a global medium for communications, information
and commerce. International Data Corporation, a market research firm, estimates
that the number of Internet users worldwide will grow from approximately 142
million in 1998 to

                                       31
<PAGE>

approximately 399 million in 2002. This increase in data traffic has
necessitated additional data network capacity and quality. As a result,
businesses have invested billions of dollars in order to meet this need.

   We believe that the combination of increasing demand on circuit-switched
networks and the proliferation of data networks, with their enhanced
functionality and efficiency, is driving the convergence of voice traffic and
data networks, including the Internet. We expect this transfer of traffic to
accelerate as corporations and network infrastructure providers attach
increasing value to data networks and as the functionality of computers and
computing devices, such as personal digital assistants, is enhanced by voice
capability.

   Network Infrastructure

   The basic technology of traditional telecommunications is designed for slow
mechanical switches. Communications over circuit-switched networks are routed
through circuits which must dedicate resources to each call until the call
ends, regardless of whether anyone is actually talking on the circuit. This
circuit-switching technology incurs a significant cost per call and does not
efficiently support the integration of voice with data services.

   Data networks, however, use electronic switching. They break the data stream
into small, individually addressed packages of data which are routed
independently of each other from the origin to the destination. Therefore, they
do not require a fixed amount of bandwidth to be reserved between the origin
and destination of each call. This allows multiple voice or voice and data
calls to be pooled, resulting in these networks being able to carry more calls
with an equal amount of bandwidth.

   The Emergence of Voice on Data Networks

   Internet telephony consists of both traditional voice and fax services and
enhanced voice-enabled services, including the addition of interactive voice
capability to Web sites, among others. Internet telephony serves both the
extensive market of existing phone users and the expanding market of computer
users. We believe data networks provide lower cost than circuit-switched
networks and are better suited to deliver future enhanced services to both
phone users and computer users.

   Telephony based on Internet protocols emerged in 1995, with the invention of
a personal computer program that allowed the transport of voice communications
over the Internet via a microphone connected to a personal computer. Initial
sound quality was poor and the service required that both parties to the
conversation use personal computers instead of telephones. In 1996, the advent
of the gateway for the first time offered anyone with access to a telephone the
ability to complete calls on the Internet. A gateway is a computer server which
translates voice and voice-related signals back and forth between a circuit-
switched network and data networks. A gateway therefore facilitates Internet
transport of telephone services traditionally carried over a circuit-switched
network.

   The Economics of Internet Telephony

   Long distance telephone calls transported over the Internet are less
expensive than similar calls carried over circuit-switched networks primarily
because the cost of using the

                                       32
<PAGE>


Internet is not determined by the distance those calls need to travel. Also,
routing calls over the Internet is more cost-effective than routing calls over
traditional circuit-switched networks, because the technology that enables
Internet telephony is more efficient than traditional circuit-switched voice
technology. The greater efficiency of data networks creates cost savings that
can be passed on to the consumer in the form of lower long distance rates.

   Beyond cost benefits, innovation in the provision of enhanced services is
expected to yield increased functionality as well. We believe such enhanced
functionality will expand the addressable market for Internet services to
include anyone with a telephone. We believe this market is potentially larger
than the market for any other existing Internet service which requires a
computer for access. Moreover, computer users will benefit from interactive
voice being an option in Web browsing and other computer-based communications.

   Limitations of Existing Internet Telephony Solutions

   The growth of Internet telephony has been limited in the past due to
perceived poor sound quality caused by technical issues such as delays in
packet transmission and bandwidth limitations related to Internet network
capacity and local access constraints. However, the continuing addition of data
network infrastructure, recent improvements in packet-switching and compression
technology, new software algorithms and improved hardware have substantially
reduced delays in packet transmissions and the effect of these delays.
International Data Corporation projects that Internet protocol telephony
revenue will grow rapidly to over $23.4 billion in 2003.

   Several large long distance carriers, including AT&T and Sprint, have
announced Internet telephony service offerings. Smaller Internet telephony
service providers have also begun to offer low-cost Internet telephony services
from personal computers to telephones and from telephones to telephones.
Traditional carriers have substantial investments in circuit-switched
technology, and therefore have been slow to embrace Internet technology. We
believe that these service offerings by large long distance carriers and
smaller providers are generally available in limited geographic areas and can
only complete calls to a limited number of locations.

   We believe that the infrastructure required for a global network is too
expensive for most companies to deploy on their own. This mandates that the
network be a combination of gateways owned by different operators. For a
network to achieve optimal functionality, however, the gateways need to be
interoperable, or able to communicate with one another. As a result, uniform
standards for vendors and manufacturers of Internet telephony equipment and
software need to be developed.

   In recent years, commercial Web sites have grown in popularity. Efforts to
enhance these Web sites with voice enabled e-commerce features such as click-
and-call contact with a customer service agent have been hampered by the early
quality problems with voice on the Internet described above.

                                       33
<PAGE>

The ITXC Solution

   We believe that the rapid growth of commercial traffic on ITXC.net
demonstrates that we deliver high quality, low cost voice and fax
communications over the Internet and are well positioned to deliver enhanced
voice-enabled services. The key advantages of our solution include:

  .  Quality. We believe that we deliver to our customers high quality voice
     communications over the Internet at competitive pricing. We maintain
     high quality primarily through our proprietary BestValue Routing
     technology and techniques, which include ITXC-developed monitoring and
     analysis software and rapid human response from our 24-hours-a-day, 7-
     days-a-week network operations center. In addition, we blend the
     redundancy of the public Internet with our use of multiple termination
     affiliates in many cities to help assure the reliability and quality of
     our network. We use dedicated data networks and even circuit-switched
     networks when data networks are not available to further assure
     consistent quality.

  .  Lower Costs. By using the public Internet, we are able to reach and
     rapidly deploy many affiliates throughout the world at a substantially
     lower capital expense than building the dedicated connections that a
     traditional circuit-switched carrier would require. Also, as a result of
     our ability to use the public Internet, we believe that we have
     significantly lower marginal costs than a circuit-switched or a
     dedicated data network.

  .  Interoperability. We have led an effort called iNOW! resulting in
     guidelines for interoperability. As of June 10, 1999, more than 35
     Internet telephony vendors had agreed to comply with the iNOW!
     initiative. The VocalTec Communications and Lucent Technologies
     equipment installed on ITXC.net is already interoperable for voice under
     a version of iNOW! We believe that as a result, we and our affiliates
     have the only multi-vendor interoperable network in the Internet
     protocol telephony industry. Although we have transferred the iNOW!
     trademark and web site to an industry standards body, we intend to
     continue to provide leadership in interoperability of voice over the
     Internet services.

  .  Global Scale. Our overlay network uses the Internet to provide a global
     communications medium to voice service providers. ITXC.net is a scalable
     network--by using the public Internet and our global network of
     affiliates, we are able to rapidly and easily add capacity when needed.
     Many of the ITXC-supplied components of our network, such as routers and
     gateways, are relatively inexpensive, allowing us to add additional
     capacity without significant capital expenditures. In addition, we
     believe that we are able to connect new affiliates to ITXC.net in
     significantly less time than it would take for a circuit-switched
     carrier or dedicated data network to establish a dedicated connection.
     For example, we connected eighteen cities in China to ITXC.net within
     three weeks after we signed an agreement with China Telecom. Moreover,
     we have a business model of purchasing terminating minutes directly from
     affiliates and selling call completion to customers and affiliates. This
     model eliminates the need for complex settlement between carriers which
     had previously slowed the deployment of a global network.

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<PAGE>

  .  Easy Access. We offer our customers two ways to connect from their
     switches to ITXC.net: through normal dedicated connections and through
     SNARCs. SNARCs are specially built devices, which we own and install on
     our customers' premises in order to eliminate the cost of dedicated
     connections from their switches to our network hubs. SNARCs allow our
     customers to benefit from the global termination capabilities of
     ITXC.net by bringing the advantages of voice over the Internet to the
     customer's premises.

  .  Enhancement of E-commerce Services. Because ITXC.net can deliver high
     quality voice on the Internet globally, we believe it can become a
     preferred network for a variety of voice-enabled web sites and enable us
     to offer services to e-commerce providers who want to provide their
     customers with the ability to talk over the Internet while browsing a
     web site.

  .  Attractive Platform for New Services. Because of our leadership position
     in establishing interoperability standards and the breadth of our
     deployed network, developers of new services are bringing products to us
     for evaluation and possible deployment on ITXC.net.

Our Strategy

   Our goal is to be the leading provider of Internet-based voice, fax and
voice-enabled services. In order to achieve this goal we intend to:

  .  Exploit Our Network Scale and Early Entrant Status

    As of June 10, 1999, we had aggressively deployed ITXC.net in 36
    countries. We believe that with the increasing use of this network,
    ITXC has developed a reputation in the communications industry for
    providing high quality voice and fax services over the Internet. In
    addition, we believe our experience as one of the first providers of
    Internet-based voice services has placed us at the forefront of
    developing the proprietary tools and techniques which enable us to
    offer our service. We intend to continue to enhance and capitalize upon
    our reputation and experience in the communications industry as we
    provide voice and fax and introduce voice-enabled services.

  .  Rapidly Expand ITXC.net by Adding Additional Affiliates Worldwide

    We have used our affiliate structure to quickly achieve a global reach
    for ITXC.net. We believe that this approach allows us to quickly expand
    and develop a broader network than our competitors. We intend to
    continue to rapidly add new affiliates worldwide in order to provide
    our customers with additional termination points.

  .  Capitalize on the Attributes of the Internet

    By overlaying ITXC.net on the public Internet, we believe that we are
    able to capture significant cost and capital savings. Instead of
    incurring the capital expense to deploy a global physical network, we
    are able to carry a substantial portion of our customer's traffic using
    the existing Internet infrastructure together with our affiliate
    network. We believe that it would require significantly more capital
    for a carrier using traditional methods of network deployment to
    implement a network with the

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<PAGE>


    same capacity and global reach as ITXC.net. Additionally, the cost of
    transporting our traffic is largely not distance sensitive, since we
    only pay only for the bandwidth we use. We believe these factors enable
    us to benefit from significant cost savings that are not available to
    operators of circuit-switched or dedicated data networks.

  .  Establish ITXC.net as the Standard for Quality in Our Industry

    By combining our BestValue Routing approach with our knowledge of
    gateway and Internet technology, we believe that we have demonstrated
    that the Internet can be an effective medium for two-way voice and fax
    communication. By continuing to provide reliable high quality voice and
    fax service with a global reach, our goal is to be the network of
    choice for new voice-enabled services.

  .  Bring Internet Voice Capability to Our Customers' Premises

    We are committed to providing our customers with high quality, low cost
    voice service. SNARCs provide our customers with a voice communications
    solution that minimizes reliance on circuit-switched networks. By
    installing SNARCs on customer premises, we can provide our customers
    with direct access to all of the ITXC.net termination points worldwide
    without the need for a direct, dedicated connection to one of our
    network hubs. We believe that, in the future, an extension of our SNARC
    program will connect our customers' customers directly to the Internet.

  .  Continue to Provide Leadership in Interoperability Initiatives

    We are a founder of the iNOW! initiative. This initiative began as a
    collaboration with Lucent Technologies and VocalTec Communications to
    establish industry standards for interoperability among Internet voice
    products and services. We believe that our leadership of the iNOW!
    initiative may further strengthen our position in the industry.

    We believe that the iNOW! initiative has already set the industry
    standard for gateway interoperability. As a result of the iNOW!
    initiative, Lucent Technologies and VocalTec Communications gateways
    are already interoperable for voice traffic on ITXC.net. This provides
    ITXC and its affiliates with a choice of vendors which other service
    providers do not have. As of June 10, 1999, more than 35 other vendors
    of gateways, IP telephony components and other equipment and software
    had agreed to comply with the iNOW! initiative. Such vendors include
    3Com, Alcatel, Ascend, Cisco Systems, Dialogic, ECI Telecom, Motorola,
    Netrix, Samsung Electronics and Siemens. By leading these efforts among
    suppliers, manufacturers, software vendors and carriers, we believe
    ITXC.net will be positioned to exploit new opportunities in Internet
    voice services.

  .  Deliver Additional Voice-Enabled Services Over ITXC.net

    We believe that Internet telephony represents only the beginning of the
    evolution of the Internet as a medium for voice, fax and voice-enabled
    services. Through enhancements to ITXC.net, we believe that we can
    provide the network for wide commercial deployment of new voice, fax
    and voice-enabled services from traditional telephony technology
    suppliers like Lucent Technologies, new entrants

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<PAGE>

    like Cisco Systems, Internet telephony companies like VocalTec
    Communications and a number of start-ups. We believe that, in the
    future, the Internet will serve as a platform for voice, fax and voice-
    enabled services that may be accessed from traditional phones, personal
    computers and a variety of devices that span the range between
    telephones and personal computers.

ITXC.net

   ITXC.net allows us to deliver reliable, high quality voice and fax service
through an actively-managed network overlayed on the public Internet.

   We have implemented a global communications network by using the public
Internet to connect ITXC-owned network hubs in the U.S. and, as of June 10,
1999, more than 200 affiliate-owned gateways in 36 countries. We use ITXC-
developed software and skilled network management personnel to help assure the
reliability and quality of voice transmission over the Internet. To further
enhance the reliability of ITXC.net, we are also able to route and terminate
voice traffic through alternate channels.

   The key components of ITXC.net include:

  .  The Public Internet

    ITXC.net routes voice traffic over the public Internet, which allows
    traditional telephone users to benefit from its cost savings. By using
    the Internet we are able to reach and rapidly deploy many affiliates
    throughout the world at what we believe to be significantly lower
    capital costs than that of building the dedicated connections that a
    circuit-switched carrier or dedicated data network would require.

  .  Global Network of Affiliates

    We have a global network of independent affiliates that own their own
    gateways and originate and/or terminate voice traffic over ITXC.net. We
    have used our affiliate structure to rapidly achieve what we believe to
    be the broadest global network in the Internet telephony marketplace.
    As of June 10, 1999, we had affiliates in more than 75 international
    cities operating more than 110 ITXC.net points of presence in 36
    countries. Our affiliates range from small Internet service providers
    to traditional telephone companies.

  .  BestValue Routing

    Our BestValue Routing approach employs ITXC-developed software and
    techniques to efficiently and cost-effectively route voice traffic over
    ITXC.net. We believe that our ability to develop and deploy intelligent
    routing methods represents a significant competitive advantage. We
    believe that this approach enables us to provide consistent, reliable
    quality, since we are able to avoid the majority of Internet congestion
    points and minimize packet loss and delay.

    We implement our BestValue Routing approach from our 24-hours-a-day, 7-
    days-a-week network operations center, where we poll our affiliates'
    gateways periodically to assure their stability, test the quality of
    Internet connections to the gateways and collect call detail records in
    near real-time to monitor the quality of calls placed over

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<PAGE>

    our network. We use network analysis software to compare monitoring
    data to predetermined parameters from our database of call detail
    records. This software generates reports on a per route basis when the
    measured parameters fail to meet predetermined standards. Frequent
    analysis of this information allows us to rapidly correct network
    problems such as congestion or inoperative gateways.

    Our monitoring and analysis software helps our staff to manage a
    routing scheme across multiple switches and gateways around the world.
    Our routing technicians establish predetermined percentages of traffic
    to be sent to each provider, based both on price and quality. If a
    particular Internet route or termination provider is not meeting our
    standards, our staff switches to a better quality route and then
    resolves the problem. For example, if transport through the public
    Internet proves to be unreliable on a particular route, we can reroute
    the traffic through dedicated data on circuit-switched networks to
    terminate the call in a traditional manner. The use of multiple
    termination affiliates in many cities in which we operate provides us
    with numerous termination possibilities to help ensure completed calls
    with consistent quality.

  .  Multiple Access Points

    As of June 10, 1999, we had two network hubs, one in New York and one
    in Los Angeles, each consisting of a switch and multiple gateways. Our
    customers access ITXC.net through dedicated connections from their
    switches to these network hubs or by using SNARCs located on their
    premises. SNARCs connect our customers' switches to the Internet and
    ITXC.net and thereby avoid costly, distance-based circuit-switched
    dedicated line charges associated with connecting customer switches to
    our network hubs. As of June 10, 1999, we had installed 15 SNARCs at
    eight customer sites.

Our Strategic Carrier and Technology Partners

   We believe that our strategic relationships with carrier affiliates are
important because they allow us to extend the geographic reach of ITXC.net. We
believe that these relationships will lead to a broader origination/termination
presence in key areas and allow us to provide service over our own network for
more of our customers. We also expect that these relationships will assist us
in focusing our development of new voice-enabled services. We currently have
strategic carrier relationships with Bell Atlantic, China Telecom and Korea
Telecom.

    .  Bell Atlantic. We have a nonexclusive affiliate agreement with Bell
       Atlantic which we believe to be the first Internet protocol
       telephony agreement for a regional Bell operating company. Under the
       agreement, Bell Atlantic is terminating traffic originated by our
       affiliates worldwide. This arrangement provides our customers with
       high capacity and quality termination on the east coast of the
       United States using an Internet protocol format, as opposed to the
       traditional circuit-switched format.


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<PAGE>


    .  China Telecom. We entered into an agreement and are currently
       exchanging billable calls with China Telecom, the largest
       telecommunications service provider in the People's Republic of
       China, to originate calls from and terminate calls throughout China.
       Under this agreement, China Telecom uses our WWeXchange Service to
       provide routing and settlement to worldwide destinations and
       provides termination services on calls that we send to China.

    .  Korea Telecom. We have entered into a non-exclusive agreement
       regarding international Internet protocol services with Korea
       Telecom, the largest telecommunications service provider in South
       Korea. Under this agreement, we have agreed jointly with Korea
       Telecom to provide international Internet protocol services and
       value added services through the use of Internet protocol telephony
       and other telecommunications services between the Republic of Korea,
       the United States and other locations. Korea Telecom uses ITXC.net
       to complete outbound calls and is terminating calls sent over
       ITXC.net.

   Under our agreements with these affiliates, we pay them for all authorized
calls that they terminate for us, at agreed-upon rates. We provide them with
limited technical assistance and assist them in obtaining appropriate gateways
and other equipment from third-party providers.

   We do not currently generate significant revenues from any of these
affiliates. They are important to us because they provide expanded global reach
for ITXC.net. termination points in locations which are significant for our
customers.

   Because gateways are critical to the infrastructure of ITXC.net, we have
strategic relationships with Lucent Technologies and VocalTec Communications,
both of which are leading gateway manufacturers. Lucent Technologies has also
provided us with vendor financing in connection with the purchase of gateways.
VocalTec Communications is an equity investor in ITXC. Additionally, we have
worked closely with both companies to develop gateway interoperability
standards through our iNOW! initiative.

   We expect our strategic relationships to continue and that our relationships
with these and other technology partners will help drive the development of new
voice, fax and voice-enabled services over ITXC.net.

Our Services

   WWeXchange Service

   In April 1998, we introduced our WWeXchange service, the first application
enabled by ITXC.net. This service provides international call completion to our
customers and enables them to offer their own customers phone-to-phone global
voice and fax service. Our WWeXchange service relies upon Internet telephony
technology. Such technology permits calls originated by a telephone to be
transmitted over the Internet. We believe that Internet telephony is the first
technology that allows non-computer users to access the Internet.


                                       39
<PAGE>

   Our WWeXchange service provides our customers with high quality, low cost
global long distance service without their having to understand or deploy
Internet telephony technology themselves. We believe that the high quality of
calls completed using our WWeXchange service allows our customers to use
ITXC.net as an alternative to traditional voice traffic networks.

   We believe that our affiliates benefit from our WWeXchange service because
they:

    .  rapidly obtain a flow of international traffic without incurring
       significant sales or marketing costs;

    .  obtain high quality international long distance for their originated
       calls at lower rates than through traditional telephony;

    .  connect directly to other affiliates while having a single billing
       relationship with us; and

    .  have a global reach without incurring the incremental costs of
       building and operating multiple facilities.

   SNARCs

   SNARCs are specially built gateways that we place on selected customer
premises in order to eliminate the cost of backhaul from customer switches to
our switches. Until we launched our SNARC program in April 1999, customers had
to bear the expense of running dedicated circuits from their facilities to
their suppliers. This is known as backhaul. Our customers also typically ran
circuits from their facilities to our network hubs in New York or Los Angeles.
However, the introduction of our SNARC program reduces the expense of backhaul
by transporting traffic directly to the Internet and ITXC.net in whatever city
the customer is located. We believe that this use of Internet capability to
eliminate the expense of backhaul will make us more attractive to customers
located away from major telephony hubs. As of June 10, 1999, we had installed
15 SNARCs at eight customer sites.

   Future Voice and Voice-Enabled Services

   We intend to make significant investments to develop and market additional
services for use over ITXC.net. We believe that as a result of the convergence
of the data and communications networks and the capabilities and size of
ITXC.net, we will be able to offer next-generation, voice-enabled services to
both new and existing customers. In addition, we believe that ITXC.net's open
architecture, combined with the strength and size of our customers, affiliates
and strategic relationships, will attract developers of voice and voice-enabled
services to our network.

   We may introduce the following voice and voice-enabled services in the
future and we may introduce other services not listed. However, we cannot
assure you that we will be able to successfully develop or implement these or
other services in the future.

    .  Enhanced Phone-to-Phone Service: Planned enhancements to our
       existing WWeXchange service include:


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<PAGE>

      .  800 and 900 service;

      .  number portability;

      .  subscriber authentication;

      .  conferencing services; and

      .  subscriber identification through voice prints and voice
         commands.

    .  Personal Computer-to-Phone Service and Phone-to-Personal Computer
       Service: ITXC.net may be used to terminate calls that originate on
       personal computers as well as calls that originate on telephones. We
       believe that ITXC.net has the same advantages of consistent quality,
       broad coverage and competitive prices for personal computer-
       originated calls as it does for telephone-originated calls. We
       believe that subscribers would also be able to specify that they
       want to receive ordinary telephone calls on a personal computer
       rather than a standard telephone and ITXC.net would be able to
       complete these calls.

    .  Device-to-Phone Service and Phone-to-Device Service: There are
       Internet phone devices available on the market today that allow
       owners to make calls over the Internet. While there is no
       incremental cost for these calls over the cost of Internet access,
       calls can only be made to others who have Internet phones. We may
       use ITXC.net to enable the completion of inexpensive calls from
       these devices to any telephone. In addition, we believe that other
       devices, such as personal digital assistants, will become voice-
       enabled.

    .  Unified Messaging Service: We may be able to offer a service over
       ITXC.net that our customers can use to provide their customers with
       telephone access to voice messages, e-mail and faxes. In addition,
       our customers may be able to provide to their customers access to
       voice mail from personal computers.

    .  Voice-enhanced E-commerce: Internet Web sites used both for sales
       and for customer service are being enhanced by the addition of
       click-and-call services which allow the viewer to talk through his
       or her personal computer to an agent, who sees what the user sees,
       can answer questions and take orders. As with other Internet
       telephony applications, voice quality has been an obstacle to the
       wide-spread deployment of click-and-call services. We believe that
       we can use ITXC.net and its capabilities to add consistent quality
       to voice-enhanced e-commerce.

    .  Single Number Service: We believe that ITXC.net will be able to
       support a product service enabling subscribers to maintain a single,
       permanent telephone number for all calls regardless of their
       location. This single number would serve as a billing number when
       the subscriber is placing calls and as a reach-me number for
       receiving calls. The number could be reassigned to any phone or
       personal computer. This type of call-forwarding would take advantage
       of Internet-addressing and ITXC.net to eliminate most of the costs
       and technical obstacles which have prevented the widespread
       deployment of such services on circuit-switched networks.

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<PAGE>

Sales, Marketing and Distribution

   Our sales and marketing goals are to:

    .  expand the use of our WWeXchange service by our existing call
       origination customers and affiliates and further expand our call
       origination customer base;

    .  expand our terminating affiliate base;

    .  increase the number of carriers that are ITXC affiliates; and

    .  establish a market leadership position among providers of voice, fax
       and voice-enabled services over the Internet.

   We use the reputations and industry relationships cultivated by our senior
management and our status as an early entrant to attract affiliates to
ITXC.net. We typically meet potential affiliates at Internet voice trade shows
and seminars we conduct on Internet telephony. We often meet potential
customers through directed sales calls by our sales personnel and at telephony
trade shows. We also target strategic affiliates internationally and have made
joint sales calls with Lucent Technologies or VocalTec Communications.

   We have a dedicated sales force that is supplemented by members of our
executive management team. Our salespeople are based regionally within the
United States and in Singapore and London, as well as in our corporate office.
We also have sales agents located in China and Venezuela. Our senior management
focuses on maintaining and cultivating relationships with our customers. We
assign our sales representatives specific accounts based on their level of
experience, location and the quality of the relationship between the
representative and the customer. We compensate our sales staff based in large
part on incentive-based goals and measurements. In addition to our marketing
and sales staff, we rely on our executive and operations personnel, including
the staff of our 24-hours-a-day, 7-days-a-week network operations center, to
identify sales opportunities within existing customer accounts and to provide
quality customer service.

   We also maintain an Internet web site which, among other things, provides
information to prospective customers and affiliates concerning the technical
and other requirements for becoming a part of ITXC.net.

   Our primary marketing and sales support is centralized and directed from our
headquarters office in Princeton, New Jersey. We have a full-time staff
dedicated to our marketing efforts. The marketing and sales support staff are
charged with implementing our marketing strategies, prospecting and producing
sales presentation materials and proposals.

New Services Development and Implementation

   Our development team is dedicated to the improvement and enhancement of the
monitoring and analysis software tools and Internet management systems we use
to ensure BestValue Routing, the enhancement of our management systems,
including our billing and customer care software, and the development and
implementation of new voice-enabled services. Our future success will depend,
in part, on our ability to improve existing

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<PAGE>

technology and develop and/or implement new voice-enabled services that
incorporate leading technology.

Our Subsidiaries

   Our consolidated subsidiaries are ITXC Data Transport Services LLC, a
Delaware limited liability company formed in March 1998, and ITXC Asia PTE Ltd,
a Singapore company formed in October 1998, both of which are wholly-owned by
ITXC. In addition, we have a 49% interest in ITXC Comunicacoes Ltda., a
Brazilian limited liability company formed in September 1998. Our South
American joint venture owns and operates network hubs in Sao Paolo and Rio de
Janiero, Brazil. The 51% interest that we do not own is owned by Brazilian
telecommunications companies. ITXC Comunicacoes intends to deploy facilities,
or cause affiliates to deploy facilities, in other cities in Brazil as well as
in Argentina, Paraguay, Chile and Uruguay. We have granted ITXC Comunicacoes
the exclusive right to deploy ITXC.net facilities in those regions. All of the
voice traffic originated from ITXC Comunicacoes travels over ITXC.net.

Competition

   The long distance telephony market and the Internet telephony market, are
highly competitive. There are several large and numerous small competitors, and
we expect to face continuing competition for ITXC.net based on price and
service offerings from existing competitors and new market entrants in the
future. The principal competitive factors in our 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 major and emerging telecommunications carriers in the
United States and foreign telecommunications carriers.

  .IP and Internet Telephony Service Providers

       During the past several years, a number of companies have introduced
    services that make Internet telephony or voice services over the
    Internet available to businesses and consumers. AT&T Global
    Clearinghouse, GRIC Communications, VIP Calling route traffic to
    destinations worldwide and compete directly with us. Other internet
    telephony service providers focus on a retail customer base and may in
    the future compete with us. These companies may offer the kinds of
    voice-enabled services we intend to offer in the future. 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.

  .Telecommunications Companies and Long Distance Providers

       A number of telecommunications companies, including AT&T, Deutsche
    Telekom, MCI WorldCom and Qwest Communications, currently maintain, or
    plan to maintain, data networks to route the voice traffic of other
    telecommunications companies. These companies, which tend to be large
    entities with substantial

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<PAGE>

    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.

   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-based voice services. We believe that one of our key competitive
advantages is our ability to deliver reliable, high quality voice service over
the Internet in a cost-effective manner. We cannot assure you, however, that
this advantage will enable us to succeed against comparable service offerings
from our competitors.

Government Regulation

   Regulation of Internet Telephony

   The use of the Internet to provide telephone service is a recent market
development. At present, we are not aware of any domestic, and are only aware
of a few foreign laws or regulations, that prohibit voice communications over
the Internet.

   United States. We believe that, under United States law, the Internet-
related services that we provide constitute information services (as opposed to
regulated telecommunications services) and, as such, are not currently actively
regulated by the FCC or any state agencies charged with regulating
telecommunications carriers. Nevertheless, aspects of our operations may be
subject to state or federal regulation, including regulation governing
universal service funding, disclosure of confidential communications, copyright
and excise tax issues. We cannot assure you that Internet-related services will
not be actively regulated in the future. Several efforts have been made in the
U.S. to enact federal legislation that would either regulate or exempt from
regulation services provided over the Internet. Increased regulation of the
Internet may slow its growth, particularly if other countries also impose
regulations. Such regulation may negatively impact the cost of doing business
over the Internet and materially adversely affect our business, operating
results, financial condition and future prospects.

   In addition, the FCC is currently considering whether to impose surcharges
or other common carrier regulations upon certain providers of Internet
telephony, primarily those which, unlike us, provide Internet telephony
services to end users located within the U.S. While the FCC has presently
decided that information service providers, including Internet telephony
providers, are not telecommunications carriers, various companies have
challenged that decision. Congressional dissatisfaction with FCC conclusions
could result in requirements that the FCC impose greater or lesser regulation,
which in turn could materially adversely affect our business, financial
condition, operating results and future prospects.

   On April 10, 1998, the FCC issued a report to Congress discussing its
implementation of certain universal service provisions contained in 1996
amendments to the Communications

                                       44
<PAGE>


Act of 1934. In the report, the FCC indicated that it would examine the
question of whether certain forms of phone-to-phone Internet protocol telephony
are information services or telecommunications services. The two are treated
differently in several respects, with certain information services being
regulated to a lesser degree. 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
protocol 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
regulations as telecommunications services, the FCC may require providers of
Internet telephony services to be subject to traditional common carrier
regulation, make universal service contributions, and/or pay access charges. It
is also possible that the FCC may adopt a regulatory framework other than
traditional common carrier regulation which would apply to Internet telephony
providers. Any such determinations could materially adversely affect our
business, financial condition, operating results and future prospects ITXC to
the extent that they negatively affect the cost of doing business over the
Internet or otherwise slow the growth of the Internet.

   State regulatory authorities may also retain jurisdiction to regulate the
provision of intrastate Internet telephony services. Several state regulatory
authorities have initiated proceedings to examine the regulation of such
services. Others could initiate proceedings to do so.

   One of our subsidiaries is subject to regulation by the FCC and the New York
Public Service Commission as a result of having been granted authorizations to
provide telecommunications services by these entities. Although the
certificated entity is currently not providing any regulated telecommunications
services, it is possible that the FCC or the New York Public Service Commission
could seek to assert jurisdiction over our unregulated operations.

   International. The regulatory treatment of Internet telephony outside of the
U.S. varies widely from country to country. A number of countries that
currently prohibit competition in the provision of voice telephony also
prohibit Internet telephony. Other countries permit but regulate Internet
telephony. Some countries will evaluate proposed Internet telephony service on
a case-by-case basis and determine whether it should be regulated as a voice
service or as another telecommunications service. Finally, in many countries,
Internet telephony has not yet been addressed by legislation. Increased
regulation of the Internet and/or Internet telephony providers or the
prohibition of Internet telephony in one or more countries could materially
adversely affect our business, financial condition, operating results and
future prospects.

   The European Union regulatory regime, for example, distinguishes between
voice telephony services and other telecommunications services. In Services
Directive 90/388/EEC, issued in 1990, the European Commission required member
states of the European Union to allow competition for all telecommunications
services except voice

                                       45
<PAGE>


telephony and certain other services. The Services Directive was amended in
1996 by Commission Directive 96/19/EC, which required the liberalization of all
telecommunications services, including voice telephony, by January 1, 1998. In
addition, Directive 96/19/EC held that services other than voice telephony
could be subjected to no more than a general authorization or declaration
procedure. For purposes of these directives, voice telephony is defined as the
commercial provision for the public of the direct transport and switching of
speech in real time between public switch network termination points.

   On January 10, 1998, the Commission issued a communication addressing
whether Internet protocol telephony was voice telephony and thus subject to
regulation by the member states of the European Union. Consistent with its
earlier directives, the Commission stated that Internet telephony could
properly be considered voice telephony, and thus subject to regulation by the
member states, only if all elements of its voice telephony definition were met.
In this January 1998 communication, the European Commission concluded that no
form of Internet protocol telephony currently meets the definition of voice
telephony subject to regulation by the member states of the European Union. The
European Commission stated that only phone-to-phone communications reasonably
could be considered voice telephony and that, at present, even phone-to-phone
Internet protocol telephony does not meet all elements of its voice telephony
definition. Therefore, the European Commission concluded that voice over
Internet services cannot for the time being be classified as voice telephony.

   As a result of the European Commission's conclusion, providers of Internet
protocol telephony should be subjected to no more than a general authorization
or declaration requirement. The member states of the European Union are:
Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy,
Luxembourg, The Netherlands, Portugal, Spain, Sweden and the United Kingdom.
However, we cannot assure you that more stringent regulatory requirements will
not be imposed by individual member states of the European Union, since
Commission communications, unlike directives, are not binding on the member
states. The member states therefore are not obligated to reach the same
conclusions as the Commission on this subject so long as they adhere to the
definition of voice telephony in the Services Directive. In fact, France is
currently conducting an investigation into how Internet protocol telephony
should be regulated. Moreover, in its January 10, 1998 IP Telephony
Communication, the European Commission stated that providers of Internet
protocol telephony whose services satisfy all elements of the voice telephony
definition and whose users can dial out to any telephone number can be
considered providers of voice telephony and may be regulated as such by the
member states of the European Union. We cannot assure you that the services
provided over ITXC.net will not be deemed voice telephony subject to heightened
regulation by one or more member states. Moreover, we cannot assure you that
the failure of ITXC or any of our customers or affiliates to obtain any
necessary authorizations will not have a material adverse effect on our
business, financial condition, operating results and future prospects.

   We are also providing service in countries where regulation of Internet
protocol telephony is far more restrictive than in the European Union.
Specifically, we have a strategic affiliate relationship with China Telecom to
provide Internet protocol telephony services in the People's Republic of China.
See "--Our Strategic Carrier and Technology

                                       46
<PAGE>


Partners." China currently prohibits foreign ownership of telecommunications
companies and strictly limits competition in the telecommunications sector.
Internet protocol telephony is now being provided on an experimental basis in
China by China Telecom, Unicom, and Jitong Communications in three non-
competing geographic regions. It remains uncertain how IP Telephony will be
treated in China once the trial period ends and specifically, whether China
Telecom and/or others will be granted more permanent authorization to provide
Internet protocol telephony in China.

   In addition, as we make our services available in foreign countries, and as
we facilitate sales by our customers and affiliates to end users located in
foreign countries, such countries may claim that we are required to qualify to
do business in the particular foreign country, that we are otherwise subject to
regulation, including requirements to obtain authorization, or that we are
prohibited in all cases from conducting our business as conducted in that
foreign country. Our failure to qualify as a foreign corporation in a
jurisdiction in which we are required to do so or to comply with foreign laws
and regulations could materially adversely affect our business, financial
condition, operating results and future prospects, including by subjecting us
to taxes and penalties and/or by precluding us from, or limiting us in,
enforcing contracts in such jurisdictions.

   Our customers and affiliates may also currently be, or in the future may
become, subject to requirements to qualify to do business in a particular
foreign country, to otherwise comply with regulations, including requirements
to obtain authorization, or to cease from conducting their business as
conducted in that foreign country. We cannot be certain that our customers and
affiliates either are currently in compliance with any such requirements, will
be able to comply with any such requirements, and/or will continue in
compliance with any such requirements. The failure of our customers and
affiliates to comply with such requirements could materially adversely affect
our business, financial condition, operating results and future prospects.

   Certain Other Regulation Affecting the Internet

   United States. Congress has recently adopted legislation that regulates
certain aspects of the Internet, including online content, user privacy and
taxation. In addition, Congress and other federal entities are considering
other legislative and regulatory proposals that would further regulate the
Internet. Congress is, for example, currently considering legislation on a wide
range of issues including Internet spamming, database privacy, gambling,
pornography and child protection, Internet fraud, privacy and digital
signatures. Various states have adopted and are considering Internet-related
legislation. Increased U.S. regulation of the Internet may slow its growth,
particularly if other governments follow suit, which may negatively impact the
cost of doing business over the Internet and materially adversely affect our
business, financial condition, results of operations and future prospects.

   International. The European Union has also enacted several directives
relating to the Internet. The European Union has, for example, 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,

                                       47
<PAGE>


rights to have inaccurate data rectified, rights to recourse in the event of
unlawful processing and rights to withhold permission to use their data for
direct marketing. The directive could, among other things, affect U.S.
companies that collect or transmit information over the Internet from
individuals in European Union member states, and will impose restrictions that
are more stringent than current Internet privacy standards in the U.S. 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. Although we do not engage in the collection of
data for purposes other than routing our services and billing for our services,
the directive is quite broad and the European Union privacy standards are
stringent. Accordingly, the potential effect on ITXC of development in this
area is uncertain.

Proprietary Rights

   Proprietary rights are important to our success and our competitive
position. As of June 10, 1999, we had four pending applications for trademarks
in the U.S. and 13 pending applications for trademarks in other parts of the
world. We have also applied for one patent in the U.S. for our network
monitoring and management techniques. The laws of some foreign countries do not
protect our proprietary rights to the same extent as do the laws of the U.S.,
and effective copyright, trademark and trade secret protection may not be
available in such jurisdictions. In general, our efforts to protect our
intellectual property rights through copyright, trademark and trade secret laws
may not be effective to prevent misappropriation of our content, and our
failure to protect our proprietary rights could materially adversely affect our
business, financial condition, operating results and future prospects. Despite
such protection, a third party could, without authorization, copy or otherwise
appropriate our proprietary network information. Our agreements with employees
and others who participate in development activities could be breached, we may
not have adequate remedies for any breach, and our trade secrets may otherwise
become known or independently developed by competitors.

   We rely upon license agreements with respect to our use of the software and
hardware provided to us by our vendors. Those license agreements may not
continue to be available to us on acceptable terms, or at all.

   We have transferred to an independent entity certain intellectual property
that we have developed for iNOW!

Employees

   As of June 10, 1999, we employed 76 people. None of our employees is subject
to any collective-bargaining arrangements, and we consider our relations with
our employees to be good.

Properties

   Our principal executive office is located in Princeton, New Jersey, where we
lease approximately 14,800 square feet. We have entered into an agreement with
our current

                                       48
<PAGE>

landlord to lease an addition 7,200 square feet in Princeton, commencing this
summer. We have network hubs in New York City and Los Angeles pursuant to co-
location arrangements. We have a sales offices in Singapore and we intend to
open a sales office in London during 1999. ITXC Comunicacoes has a sales office
in Sao Paolo, Brazil. We believe that our existing facilities, including our
Princeton expansion, are adequate for our current requirements and that
additional space can be obtained on commercially reasonable terms to meet
future requirements.

Legal Proceedings

   From time to time, we are involved in various legal proceedings relating to
claims arising in the ordinary course of business. We are not a party to any
legal proceeding, the adverse outcome of which is expected to have a material
adverse effect on our business, financial condition, operating results or
future prospects.

                                       49
<PAGE>

                                   MANAGEMENT

Executive Officers and Directors

   Our executive officers and directors are as follows:

<TABLE>
<CAPTION>
   Name                  Age Position
   ----                  --- --------
   <C>                   <C> <S>
   Tom I. Evslin........  55 Chairman of the Board, Chief Executive Officer and
                             President
   John G. Musci........  43 Executive Vice President, Chief Operating Officer
                             and Director
   Edward B. Jordan.....  38 Executive Vice President, Chief Financial Officer,
                             Treasurer, Secretary and Director
   Mary A. Evslin.......  50 Vice President, Marketing and Customer Success
   Bradley E. Miller....  33 Vice President, Operations
   Steven J. Ott........  39 Vice President, Global Sales
   Eric G. Weiss........  32 Vice President and Business Unit Manager,
                             WWeXchange Service
   William P. Collatos..  45 Director(/1/)(/2/)
   Elon A. Ganor........  48 Director(/1/)(/2/)
   Frederick R. Wilson..  37 Director(/1/)(/2/)
</TABLE>
- --------

(1) Member of our compensation committee.

(2) Member of our audit committee.

   Tom I. Evslin, our founder, has been Chairman of the Board, Chief Executive
Officer and President since our inception in July 1997. From December 1994
until July 1997, Mr. Evslin was employed by AT&T, where he designed its
Internet strategy and launched and ran its Internet service provider, AT&T
WorldNet Service. From December 1991 until December 1994, he worked for
Microsoft, where he last served as General Manager, Server Applications
Division from May 1993. From 1969 to 1991, he was Chairman and Chief Executive
Officer of Solutions, Inc., a communications software development company. He
is the Chairman of the Policy Committee and a member of the Board of the Voice
On The Net Coalition. Mr. Evslin served on the board of directors of VocalTec
from 1997 until his resignation on June 10, 1999. He is Mary A. Evslin's
husband.

   John G. Musci joined us in February 1999 as Executive Vice President and
Chief Operating Officer and as a Director. From June 1998 until February 1999,
Mr. Musci served as Senior Vice President of Wholesale Switched Services at
Qwest Communications International, an Internet communications company. He held
various positions at LCI International, a long distance telecommunications
company, including Senior Vice President--Wholesale Switched Services, from
1985 until June 1998, when LCI was acquired by Qwest. Prior to 1985, Mr. Musci
held various positions at AT&T Information Systems and Ohio Bell.

   Edward B. Jordan has been an Executive Vice President since February 1999,
has served as our Chief Financial Officer, Secretary and Treasurer since he
joined us in September 1997 and has served as a Director since April 1998. From
September 1997 until February 1999, he was our Vice President, Administration.
For ten years prior to joining us, Mr. Jordan was employed by Dialogic
Corporation, a manufacturer of computer telephony products, serving first as
Controller and then as Chief Financial Officer, Treasurer and Vice

                                       50
<PAGE>

President. Prior to joining Dialogic, Mr. Jordan served in the Audit Department
of Deloitte & Touche from 1982 to 1986. Mr. Jordan is a certified public
accountant.

   Mary A. Evslin has been our Vice President, Marketing and Customer Success
since July 1997. From 1993 through July 1997, Ms. Evslin served as a volunteer
for The American Red Cross and for various charitable organizations. From 1992
to 1993, Ms. Evslin was employed by Attachmate Corporation, a provider of
mainframe connectivity software to businesses, as Manager of Service Marketing.
From 1986 to 1992, she served as President of Solutions International, a
software marketing company. From 1978 to 1986, Ms. Evslin served as Vice
President of Marketing and Sales at Solutions, Inc., a communications software
development company. She is Tom I. Evslin's wife.

   Bradley E. Miller joined us as our Vice President, Operations in November
1997. From June 1996 to November 1997, Mr. Miller was Director of Operations at
CGX Telecom/CAIS Internet, a tier 1 Internet service provider. From May 1995
until June 1996, Mr. Miller was a Management Information Systems Manager at US
Assist, an international travel assistance company. From June 1987 until May
1995, he was the Director of Operations at Donohoe Constructions Company, a
construction firm.

   Steven J. Ott has been our Vice President, Global Sales since January 1998.
From August 1994 to January 1998, Mr. Ott served as Vice President of Global
Sales and Support at Voxware, Inc., a software company providing core audio
compression algorithms and applications to technology companies. Prior to
August 1994, Mr. Ott served first as a Director and then as Vice President of
Corporate Development at Legent Corporation, a software development company.

   Eric G. Weiss joined us in October 1997 as our Business Unit Manager,
WWeXchange Service and served in that capacity until May 1998. From May 1998 to
present, Mr. Weiss has served as Vice President and Business Unit Manager,
WWeXchange Service. From May 1995 to October 1997, he was employed by Dialogic
Corporation as a Product Line Manager. From September 1994 until May 1995, Mr.
Weiss was the Manager of BCE Ventures, with Bell Canada Enterprises (BCE) Inc.,
a telecommunications firm. From 1991 until September 1994, he held various
management positions with Hewlett Packard Company, a manufacturer of electronic
equipment.

   William P. Collatos has been a Director since April 1998. Mr. Collatos is a
founding General Partner of Spectrum Equity Investors, L.P., a private equity
investment firm which invests in telecommunications, information and media
companies. Prior to co-founding Spectrum in 1994, Mr. Collatos was a founding
General Partner of Media/Communications Partners and a General Partner of TA
Associates. Mr. Collatos currently serves on the boards of directors of
Jazztel, plc, and Golden Sky Systems, Inc. and serves on the board of directors
of Galaxy Telecom GP, the general partner of Galaxy Telecom, LP.

   Elon A. Ganor has been a Director since October 1997. He has served as the
Chairman of the Board of VocalTec Communications, Ltd. since 1993. He was CEO
of VocalTec between 1993 and 1998.

   Frederick R. Wilson has served as a Director since April 1998. He founded
Flatiron Partners, a venture capital firm which primarily invests in Internet-
oriented companies, in

                                       51
<PAGE>

August 1996. For ten years prior to August 1996, Mr. Wilson worked for Euclid
Partners, an early-stage venture capital firm. Mr. Wilson is a director of The
Street.com and StarMedia Network.

   Officers who do not have an employment agreement with us, serve at the
discretion of our board of directors and hold office until their successors are
elected and qualified or until their earlier resignation or removal.

   Upon the closing of the offerings, our board of directors will be divided
into three classes. Each class will consist, as nearly as possible, of one-
third of the whole number of the board of directors. Directors for each class
will be elected at the annual meeting of stockholders held in the year in which
the term for such class expires. Upon election, directors will serve for three
years, and will hold office until their successors are elected and qualified.
There are currently six members of our board of directors. Tom I. Evslin and
Frederick R. Wilson are in class I; their terms will expire in 2000. John G.
Musci and Elon A. Ganor are in class II; their terms will expire in 2001.
Edward B. Jordan and William P. Collatos are in class III; their terms will
expire in 2002. We intend to add an additional independent director after the
closing of the offerings.

Board Committees

   Our board of directors has three standing committees: an audit committee, a
compensation committee and a CEO committee.

   The audit committee consists of Messrs. Collatos, Wilson and Ganor, with Mr.
Collatos serving as Chairman. The audit committee recommends the firm to be
appointed as independent accountants to audit our financial statements and to
perform services related to the audit; reviews the scope and results of the
audit with the independent accountants; reviews our year-end operating results
with our management and the independent accountants; considers the adequacy of
our internal accounting and control procedures; reviews the non-audit services
to be performed by the independent accountants, if any; and evaluates the
accountants' independence.

   The compensation committee consists of Messrs. Collatos, Wilson and Ganor,
with Mr. Wilson serving as Chairman. The compensation committee reviews,
recommends and approves compensation arrangements for executive officers and
other senior level employees, and administers certain benefit and compensation
plans and arrangements.

   The CEO committee is composed solely of Mr. Evslin. The CEO committee grants
stock options and determines the basic terms of option grants to certain
employees under our stock incentive plan in accordance with the terms set for
that plan by our compensation committee. Our plan grants the CEO committee this
authority with respect to persons other than directors, specified executive
officers, consultants and other individuals identified by the compensation
committee.

Outside Director Compensation

   We have not yet paid any compensation to non-employee directors. We
anticipate that in the future, non-employee directors may receive annual fees,
meeting fees and periodic option grants.

                                       52
<PAGE>

                             EXECUTIVE COMPENSATION

   The following table sets forth the total cash and non-cash compensation that
we paid or accrued during the year ended December 31, 1998 with respect to our
Chief Executive Officer and our four other most highly compensated executive
officers. The principal components of these individuals' current cash
compensation are the annual base salary and bonus included in the Summary
Compensation Table. We have also described below other compensation these
individuals receive under employment agreements and our stock incentive plan.
Mr. Musci, our chief operating officer, joined us in February 1999. His base
salary for 1999 is $200,000.

                           Summary Compensation Table

<TABLE>
<CAPTION>
                                Annual Compensation        Long Term Compensation
                                --------------------       ----------------------
                                                            Number of Securities
                                                                 Underlying
                                                                Options/SARs
 Name and  Principal Position   Salary($)  Bonus($)                 (#)
 ----------------------------   ---------- ---------       ----------------------
 <S>                            <C>        <C>             <C>
 Tom I. Evslin................     232,308   150,000(/1/)             --
  Chairman of the Board, Pres-
   ident and Chief Executive
   Officer

 Edward B. Jordan.............     120,192       --                   --
  Executive Vice President and
   Chief Financial Officer
 Mary A. Evslin...............     107,788       --                   --
  Vice President, Marketing
   and Customer Success
 Steven J. Ott................      96,153    32,924(/2/)         175,000
  Vice President, Global Sales
 Bradley E. Miller............     119,134       --                   --
  Vice President, Operations
</TABLE>
- --------
(1) Earned in 1998, but not paid until 1999.
(2) Consists of commissions earned by Mr. Ott in 1998.

   The following table presents certain information regarding stock options
granted to the named executive officers during 1998.

                           Options/SAR Grants in 1998

<TABLE>
<CAPTION>
                                                                                 Potential Realizable
                                                                                   Value at Assumed
                                                                                Annual Rates of Stock
                                                                                Price Appreciation for
                                          Individual Grants                          Option Term
                         ------------------------------------------------------ ----------------------
                          Number of       % of total
                          Securities     Options/SARs
                          Underlying      Granted to  Exercise Price
                         Options/SARs    Employees in   Per Share    Expiration
          Name           Granted (#)         1998         ($/Sh)        Date      5% ($)     10% ($)
          ----           ------------    ------------ -------------- ---------- ---------- -----------
<S>                      <C>             <C>          <C>            <C>        <C>        <C>
Tom I. Evslin...........       --             --            --            --           --          --
Edward B. Jordan........       --             --            --            --           --          --
Mary A. Evslin..........       --             --            --            --           --          --
Steven J. Ott...........   175,000(/1/)      11.6          0.60        1/7/08       66,034     167,343
Bradley E. Miller.......       --             --            --            --           --          --
</TABLE>
- --------

(1) These options were granted to Mr. Ott during 1998 under our stock incentive
    plan.

                                       53
<PAGE>


   The following table presents information regarding the number and value of
stock options held by the named executive officers at December 31, 1998. The
value calculations are based upon an assumed value at December 31, 1998 of $
per share, representing the midpoint of the estimated price range.

                    Aggregated Option/SAR Exercises in 1998
                         and Year-end Option/SAR Values

<TABLE>
<CAPTION>
                               Number of Securities
                              Underlying Unexercised   Value of Unexercised In-
                                  Options/SARs at       the-Money Options/SARs
                               December 31, 1998 (#)   at December 31, 1998 ($)
                             ------------------------- -------------------------
Name                         Exercisable Unexercisable Exercisable Unexercisable
- ----                         ----------- ------------- ----------- -------------
<S>                          <C>         <C>           <C>         <C>
Tom I. Evslin...............       --           --         --           --
Edward B. Jordan............   100,000      200,000
Mary A. Evslin..............    33,334       66,666
Steven J. Ott...............       --       175,000
Bradley E. Miller...........    33,334       66,666
</TABLE>

   Between January 1, 1999 and June 10, 1999, we granted options to purchase
15,000 shares of common stock to Tom I. Evslin, options to purchase 750,000
shares of common stock to John G. Musci, options to purchase 200,000 shares of
common stock to Edward B. Jordan, options to purchase 25,000 shares of common
stock to Mary A. Evslin, options to purchase 40,000 shares of common stock to
Steven J. Ott, and options to purchase 25,000 shares of common stock to Bradley
E. Miller under our stock incentive plan. Of the options granted to Mr. Ott,
options covering 25,000 shares were granted pursuant to the terms of his offer
of employment.

   None of the executive officers named in the table above exercised any stock
options during 1998. Between January 1, 1999 and June 10, 1999, Edward B.
Jordan exercised options to purchase 100,000 shares of common stock, Mary A.
Evslin exercised options to purchase 33,334 shares of common stock, and Steven
J. Ott exercised options to purchase 58,334 shares of common stock.

Employment Agreements

   Tom I. Evslin. We have entered into an employment agreement with Tom I.
Evslin, our Chairman, President and Chief Executive Officer. The agreement
expires on March 31, 2000. Pursuant to his agreement, Mr. Evslin is entitled to
receive a base salary of $250,000 and annual bonuses which, in 1999, can amount
to 100% of base salary less $75,000 and thereafter can amount to 100% of base
salary. The actual amount of bonuses paid or to be paid is determined by our
compensation committee before the start of the year in which the bonus is to be
paid and is contingent upon ITXC's achieving certain performance objectives.
Mr. Evslin is eligible to receive an additional bonus under our cash incentive
plan.

   If Mr. Evslin's employment with us is terminated by us without cause, or by
Mr. Evslin for good reason, Mr. Evslin is entitled to receive his salary and
other benefits for a period of one year, as well as a pro rata portion of his
annual bonus for the year in which the

                                       54
<PAGE>

termination occurs. If Mr. Evslin's employment is terminated for any other
reason, our obligation to pay any further compensation or benefits ends. Mr.
Evslin's employment agreement also prohibits him from being employed by a
competing business for a period of two years if his employment is terminated by
us for cause or by him without good reason or for a period of one year if his
employment is terminated for any other reason, including expiration of the term
of his employment agreement.

   Under his employment agreement, Mr. Evslin is also bound to keep certain
information confidential and to assign to us any intellectual property
developed by him during the term of his employment.

   John G. Musci. We have also entered into an employment agreement with John
G. Musci, our Executive Vice President and Chief Operating Officer. The term of
Mr. Musci's employment agreement began on February 8, 1999 and expires on
February 7, 2001. Under his employment agreement, Mr. Musci is entitled to
receive an annual base salary of not less than $200,000 and, for 1999, a bonus
not to exceed 200% of his annual base salary, subject to the attainment of
certain objectives as established by our board of directors; provided, however,
that Mr. Musci is entitled to receive a bonus of $75,000 for the six month
period ending July 31, 1999. For the calendar year 2000 and thereafter, he is
eligible to receive a cash bonus under our cash incentive plan. Mr. Musci is
also entitled to receive up to $100,000 in relocation expenses. Pursuant to his
employment agreement, Mr. Musci received non-qualified options covering 750,000
shares of ITXC common stock at an exercise price of $1.25 per share under our
stock incentive plan.

  Under his employment agreement, if Mr. Musci is terminated for cause or any
reason other than constructive termination or wrongful termination, he is
entitled to receive accrued base salary, bonus and other benefits and forfeits
any unvested options. If Mr. Musci is terminated by reason of a constructive
termination or wrongful termination, in addition to any accrued base salary,
bonus and other benefits, Mr. Musci is entitled to receive as severance a lump
sum payment in cash equal to his current salary as of the date of termination
for a period equal to the greater of the remainder of the then current term or
six months, certain additional benefits and an acceleration of the vesting
period for any of his options that have not vested as of the date of the
termination. Upon expiration of the term of his employment, Mr. Musci is
entitled to receive as severance his base salary compensation in effect at the
time of the termination for a period of six months, any accrued base salary,
bonus and other benefits and forfeits any unvested options.

   Mr. Musci's employment agreement prohibits him from becoming associated with
any competing business for the applicable severance period in the case of a
company wrongful termination or expiration of his term of employment or for six
months in the case of his termination for any other reason.

   Under his employment agreement, Mr. Musci is also bound to keep certain
information confidential and to assign to us any intellectual property
developed by him during the term of his employment.

                                       55
<PAGE>

Compensation Committee Interlocks and Insider Participation

   During 1998, our compensation committee consisted of Messrs. Evslin, Ganor
and Wilson. Mr. Evslin is our Chairman of the Board, President and Chief
Executive Officer and, until June 1999, served on the board of directors and
compensation committee of VocalTec Communications. Mr. Ganor is the Chairman of
the Board of VocalTec Communications. Other than Mr. Evslin, none of the
members of our compensation committee served as an officer or employee of ITXC
or any of its subsidiaries during fiscal 1998.

   In October 1997, we entered into an agreement with VocalTec Communications
pursuant to which:

  .  we issued to VocalTec Communications:

    .  900,000 shares of common stock;

    .  278,000 shares of Series A convertible preferred stock;

    .  warrants to purchase 122,000 shares of Series A convertible
       preferred stock; and

    .  warrants to purchase 600,000 shares of common stock, the
       exercisability of which was conditioned, in part, upon our use of
       the credit described below.

  .  we received from VocalTec Communications $500,000 in cash and the rights
     to certain information regarding VocalTec Communications' business; and

  .  we received a credit entitling us to purchase $1.0 million of VocalTec
     Communications' equipment.

  In April 1998:

  .  VocalTec's shares of Series A convertible preferred stock were converted
     into a total of 278,000 shares of our common stock; and

  .  VocalTec's preferred stock warrant was converted into a warrant to
     purchase a total of 122,000 shares of our common stock.

   In June 1999, VocalTec exercised its outstanding warrants, acquiring 722,000
shares of common stock upon payment of $722.

   VocalTec Communications also acquired 668,622 shares of our Series B
convertible preferred stock and 215,332 shares of our Series C convertible
preferred stock as part of our April 1998 and February 1999 private placements.
See "Certain Transactions--ITXC Equity Financings."

   We also have an ongoing business relationship with VocalTec Communications.
From inception through March 31, 1999, we purchased $1.0 million of hardware
and software from VocalTec Communications. We offset the purchase price of
these products against the $1.0 million credit that we received in connection
with our 1997 agreement with VocalTec Communications.

1998 Incentive Stock Option Plan

   Our stock incentive plan was adopted by our board of directors on February
17, 1998 and by our shareholders on April 2, 1998. Under the plan, incentive
stock options and non-qualified stock options to purchase shares of our common
stock may be granted to directors, officers, employees and consultants. As of
June 10, 1999, stock options covering 544,125

                                       56
<PAGE>


shares were available for grant under the plan, and stock options to purchase
2,576,472 shares were outstanding with a weighted average exercise price of
$1.97 per share. On January 1 of each year, commencing January 1, 2000, the
number of shares of common stock available for issuance under the plan will be
increased by the least of:

  .  1,000,000 shares;

  .  3% of the outstanding shares; or

  .  a number of shares determined by our board of directors.

   The per share exercise price for incentive stock options granted under the
plan will equal the fair market value of the underlying common stock on the
date of grant. The option price for shares purchased through the exercise of an
option is payable in cash or, at the discretion of our Chief Executive Officer
or compensation committee, in common stock or a combination of both.

   Our Chief Executive Officer or compensation committee determines the initial
vesting period and the expiration date(s) of each option at the time that it is
granted. As of June 10, 1999, ITXC had not granted any incentive stock options.

   Under the plan, we may also issue stock appreciation rights, either alone or
in connection with options, restricted stock awards and performance awards. As
of June 10, 1999, we had not issued any such stock appreciation rights,
restricted stock awards or performance awards.

   The plan provides that in the event of a change in control, all options
outstanding on that date will be immediately and fully exercisable upon
termination of an option holder's employment or service for certain specified
reasons within twelve months following the change in control. In addition,
under certain circumstances upon such specified termination, an option holder
may be permitted to exchange any unexercised options for a cash payment.

   The plan provides for options to terminate within specified periods of time
after employment is terminated, depending upon the reason for termination. If
an option holder's employment is terminated for cause, his or her options will
terminate immediately upon termination of employment. Unless otherwise provided
by the compensation committee or our board of directors, options are not
transferable by the option holder and can be exercised only by the option
holder during his or her lifetime or upon the option holder's death only by the
personal representative of his or her estate. The plan may be amended or
terminated by the board of directors at any time; provided, that no such action
may adversely affect any outstanding options without the consent of the
applicable option holder.

   The grant of a non-qualified option has no tax consequences to us or to the
option holder. Upon exercise of a non-qualified option, the option holder will
recognize taxable ordinary income equal to the excess of the fair market value
on the date of the exercise of the shares of common stock acquired over the
exercise price of the non-qualified option, and that amount will be deductible
by us for federal income tax purposes. The option holder will, upon a later
sale of shares, recognize short term or long term capital gain or loss,
depending on the holding period of the shares, but we will not be entitled to
an additional tax deduction.

                                       57
<PAGE>


Employee Stock Purchase Plan



   We have an employee stock purchase plan intended to meet the qualifications
for such a plan under applicable federal income tax laws. The plan will be
administered by the compensation committee of our board of directors. The
number of shares available for purchase under the plan presently consists of
250,000 shares of common stock and will increase on January 1 of each year,
commencing January 1, 2000, in an amount equal to the least of:

  .  300,000 shares of common stock;

  .  1% of the common stock outstanding on January 1; or

  .  a number of shares of common stock specified by our board.

   Shares of our common stock will be offered to our employees under the plan
through a series of successive offering periods, not to exceed 24 months, until
either the maximum number of shares available for issuance under the plan has
been purchased or the plan has been otherwise terminated. Each offering period
is of a duration determined by the compensation committee of our board of
directors. The initial offering period will begin when the plan becomes
effective and terminates on the last business day in July 2001. The next
offering period will commence on the first business day in August 2001, and
subsequent periods will commence as determined by the compensation committee.

   In order to be eligible to participate in the plan, an employee must be
engaged, on a regularly scheduled basis of more than 20 hours per week of work
for ITXC for more than 5 months per calendar year, in the rendition of personal
services to ITXC. Non-employee directors and non-employee officers are not
eligible to participate.

   Each employee who meets the employment criteria on the start date of the
initial offering period will be eligible to enter that offering period or any
subsequent offering period on the start date of any purchase period during
which he or she remains employed by us. Employees who meet the eligibility
criteria after the start date of the initial offering period will be eligible
to enter that offering period or any subsequent offering period on the start
date of any purchase period within the applicable offering period on which he
or she meets the eligibility criteria with at least 3 months of service with
ITXC or one of our corporate affiliates. The date on which an employee enters
an offering period is his or her entry date for the purposes of that offering
period.

   Employees who would, immediately after the grant, own or hold outstanding
options or other rights to purchase stock possessing 5% or more of the total
combined voting power or value of all classes of our stock may not be granted
any rights to purchase stock under the plan. Employees whose rights to purchase
stock under this plan or any other qualifying plan would exceed $25,000 worth
of stock in any calendar year are also prohibited from participating.

   Employees who participate in the plan will authorize us to deduct any
multiple of one percent of their total cash compensation during each purchase
period up to a maximum of 10% of their total cash compensation, which includes:

  .  regular base salary;

  .  pre-tax contributions made by the employee to certain benefits plans;
     and


                                       58
<PAGE>


  .  overtime payments, bonuses, commissions, profit-sharing distributions
     and other incentive-type payments.

   The maximum number of shares of common stock that an employee may purchase
during any purchase period is 1,500 shares.

   During periods when employees are permitted to make purchases, the purchase
price of the shares of common stock will be equal to 85% of the lesser of:

  .  the fair market value of the common stock on the employee's entry date
     into the applicable offering period; or

  .  the fair market value of the common stock on the date of purchase.

However, the purchase price for any employee whose entry date is other than the
start date of the offering period shall not be less than the fair market value
of the common stock on the start date of that offering period.

   Employees may end their participation in the plan at any time during an
offering period. An employee's participation ends automatically upon
termination of an employee's employment. In general, any payroll deductions for
the purchase period in which the purchase right terminates will be refunded
without interest.

   In the event of a stockholder-approved merger or consolidation in which
securities possessing more than 50% of the total combined voting power of our
outstanding securities are transferred to a person or persons different from
the persons holding those securities immediately prior to the transaction, or
in the event of a stockholder-approved sale, transfer or other disposition of
all or substantially all of our assets in complete liquidation or dissolution
of ITXC, each outstanding purchase right shall automatically be exercised. ITXC
will use its best efforts to provide written notice in advance of the
occurrence of any of these transaction. Upon receipt of such notice, employees
may terminate their outstanding purchase rights.

   Purchase rights granted under the plan are not assignable or transferable by
the employee other than by will or the laws of descent.

   The plan will terminate upon the earliest of:

  .  the last business day in August 2009;

  .  the date on which all shares available for issuance under the plan have
     been sold pursuant to purchase rights exercised under the plan; or

  .  the date on which all purchase rights are exercised in connection with
     any corporate transaction described above.

1999 Cash Incentive Plan

   We designed our cash incentive plan to encourage and reward our employees
for their contributions to our performance. All of our employees, except
salespeople, are eligible to participate in this plan. Employees who are
eligible receive quarterly and annual bonuses calculated according to a formula
which takes into account an individual performance factor and a company
performance factor. This bonus is calculated each quarter and at the end of
each year. A total of 50% of the potential bonus is paid out quarterly and 50%
is paid out annually.

                                       59
<PAGE>

                              CERTAIN TRANSACTIONS

   For a description of our relationship with VocalTec Communications, see
"Executive Compensation--Compensation Committee Interlocks and Insider
Participation."

Loans from Senior Management

   Between February 9, 1998 and April 22, 1998, we borrowed an aggregate of
$550,000 from Tom I. Evslin, our Chairman of the Board, Chief Executive Officer
and President, and $200,000 from Edward B. Jordan, our Executive Vice President
and Chief Financial Officer, and delivered a series of demand notes to these
officers. The notes bore interest at a rate of 10% per year. On April 27, 1998,
each of those notes was canceled and we paid accrued interest to Mr. Evslin and
Mr. Jordan in the amounts of $5,762 and $932, respectively. In consideration
for canceling those notes, Mr. Evslin and Mr. Jordan received 322,581 and
117,302 shares of Series B convertible preferred stock, respectively, and
warrants to purchase 322,581 and 117,302 shares of common stock,
respectively.We valued the Series B convertible preferred stock issued to Mr.
Evslin and Mr. Jordan at the same $1.75 per share price paid by all other
purchasers of the Series B convertible stock. We concluded that the fair value
of the warrants granted to Mr. Evslin and Mr. Jordan was zero at that time.

ITXC Equity Financings

   In April 1998, we sold to a limited group of investors a total of 5,865,104
shares of our Series B convertible preferred stock at a purchase price of
$1.705 per share. The following table sets forth the names of those investors
who, either directly or through an affiliate, are presently directors, officers
or five percent stockholders of ITXC, the number of shares of Series B
convertible preferred stock that such investors acquired and the aggregate
purchase price paid by such investors. Each share of Series B convertible
preferred stock is convertible into one share of our common stock.

<TABLE>
<CAPTION>
                                                               Shares     Total
 Investor                 Principal Relationship to ITXC      Purchased Price ($)
 --------                 ------------------------------      --------- ---------
 <C>                      <S>                                 <C>       <C>
 Chase Venture Capital
  Associates, L.P........ See "Principal Stockholders."       1,361,290 2,321,000

 Intel Corporation....... See "Principal Stockholders."       1,173,021 2,000,000

 Spectrum Equity
  Investors II, L.P. and  Spectrum Equity Investors II, LLP   1,173,021 2,000,000
  SEA 1998 II, L.P....... is one of our principal
                          shareholders. William P.
                          Collatos, the managing general
                          partner of Spectrum Equity
                          Investors II, L.P. and an
                          affiliate of SEA 1998 II, L.P.,
                          is one of our directors.

 DS Polaris, Ltd.,
  Polaris Fund II (Tax
  Exempt Investors), LLC,
  Polaris Fund II, LLC,
  Polaris Fund II, L.P.,
  DS Polaris Trust
  Company (foreign
  residents) (1997), Ltd.
  and Canada--Israel
  Opportunity Fund LP.... See "Principal Stockholders."         753,079 1,284,000

 VocalTec                 VocalTec Communications is one of     668,622 1,140,000
  Communications......... our principal stockholders. Elon
                          A. Ganor, the Chairman of the
                          Board of VocalTec, is one of our
                          directors.

 Tom I. Evslin and Mary   Chairman of the Board, Chief          322,581   550,000
  A. Evslin.............. Executive Officer and President;
                          and Vice President, Marketing and
                          Customer Success

 The fl@tiron Fund LLC... Frederick R. Wilson, the manager      296,188   505,000
                          of The fl@tiron Fund LLC, is one
                          of our directors.

 Edward B. Jordan........ Executive Vice President and          117,302   200,000
                          Chief Financial Officer
</TABLE>


                                       60
<PAGE>

   As part of that financing, we entered into various agreements with our
investors, including a stockholders' agreement, the principal terms of which
will automatically terminate upon the closing of the offerings, and a
registration rights agreement.

   In February 1999, we sold to a limited group of investors a total of
3,229,975 shares of our Series C convertible preferred stock at a purchase
price of $4.644 per share. The following table sets forth the names of those
investors who, either directly or through an affiliate, are presently
directors, officers or five percent stockholders of ITXC, the number of shares
of Series C convertible preferred stock that such investors acquired and the
aggregate purchase price paid by such investors. Each share of Series C
convertible preferred stock is convertible into one share of our common stock.

<TABLE>
<CAPTION>
                                                               Shares     Total
 Investor                 Principal Relationship to ITXC      Purchased Price($)
 --------                 ------------------------------      --------- ---------
 <C>                      <S>                                 <C>       <C>
 Spectrum Equity
  Investors II, L.P. and
  SEA 1998 II, L.P....... Spectrum Equity Investors II, LLP   1,173,559 5,450,008
                          is one of our principal
                          shareholders. William P.
                          Collatos, the managing general
                          partner of Spectrum Equity
                          Investors II, L.P. and an
                          affiliate of SEA 1998 II, L.P.,
                          is one of our directors.

 Chase Venture Capital
  Associates, L.P........ See "Principal Stockholders."         870,138 4,040,921

 Intel Corporation....... See "Principal Stockholders."         484,496 2,249,999

 DS Polaris, Ltd.,
  Polaris Fund II (Tax
  Exempt Investors), LLC,
  Polaris Fund II, LLC,
  Polaris Fund II, L.P.,
  DS Polaris Trust
  Company (foreign
  residents) (1997), Ltd.
  and Canada-Israel
  Opportunity Fund
  L.P. .................. See "Principal Stockholders."         263,194 1,222,273

 The Flatiron Fund
  1998/99, LLC and
  Flatiron Associates,    Frederick R. Wilson, the manager      223,256 1,036,801
  LLC.................... of The Flatiron Fund 1998/99,
                          LLC, and Flatiron Associates, LLC
                          is one of our directors.
 VocalTec
  Communications......... VocalTec Communications is one of     215,332 1,000,002
                          our principal stockholders. Elon
                          A. Ganor, the Chairman of the
                          Board of VocalTec, is one of our
                          directors.
</TABLE>

   As part of that financing, we entered into various agreements with our
investors, including a stockholders' agreement, the principal terms of which
will automatically terminate upon the closing of the offerings, and a
registration rights agreement.

   At or prior to the closing of the offerings, each share of Series B and
Series C convertible preferred stock will automatically convert into one share
of ITXC common stock.

                                       61
<PAGE>

Third Amended Registration Rights Agreement

   Each of the current holders of our Series B and Series C convertible
preferred stock, including Mr. and Mrs. Evslin and Mr. Jordan, and the Company
entered into an amended registration rights agreement whereby each stockholder
has the right, under certain circumstances and subject to certain conditions,
to request that we register under the Securities Act shares of common stock
held by them. Subject to certain conditions and exceptions, those stockholders
also have the right to require that shares of common stock held by them be
included in any registration under the Securities Act commenced by us. Please
see "Description of Capital Stock--Registration Rights" for additional
information.

Stock Option Exercises

   During 1999, certain of our executive officers exercised stock options,
resulting in the issuance of a total of 191,668 shares.

                                       62
<PAGE>

                             PRINCIPAL STOCKHOLDERS

   The following table sets forth certain information with respect to the
beneficial ownership of our common stock, as of April 30, 1999 and as adjusted
to reflect the sale of our common stock in the offerings, by:

  .  each person known by us to beneficially own more than five percent of
     our outstanding common stock,

  .  each of our directors,

  .  each executive officer named in the Summary Compensation Table, and

  .  all of our executive officers and directors as a group.

   Unless otherwise indicated, the person or persons named have sole voting and
investment power. In determining the number and percentage of shares
beneficially owned by each person, shares that may be acquired by such person
pursuant to options or warrants exercisable within 60 days of April 30, 1999
are deemed beneficially owned by such person and are deemed outstanding for
purposes of determining the total number of outstanding shares for such person
and are not deemed outstanding for such purpose for all other stockholders. The
following table assumes the conversion of all shares of our Series B and Series
C convertible preferred stock which will automatically convert into common
stock upon the closing of the offerings and reflects the June 11, 1999 exercise
by VocalTec Communications of warrants for 722,000 shares of common stock as if
such exercise occurred on April 30, 1999.

<TABLE>
<CAPTION>
                                                                         Percent of Total
                                                                   ----------------------------
                                                                   Percent Before Percent After
Executive Officers and Directors  Shares Beneficially Owned          Offerings      Offerings
- --------------------------------  -------------------------        -------------- -------------
<S>                               <C>                              <C>            <C>
Tom I. Evslin...........                  3,678,822(/1/)(/2/)(/3/)      25.6
John G. Musci...........                         --(/1/)                 --            --
Edward B. Jordan........                    335,256(/1/)(/3/)            2.4
Mary A. Evslin..........                  3,678,822(/1/)(/2/)           25.6
Steven J. Ott...........                     58,334(/1/)                   *             *
Bradley E. Miller.......                     33,334(/1/)                   *             *
Elon A. Ganor...........                  2,783,954(/4/)                19.9
William P. Collatos.....                  2,346,580(/5/)                16.8
Frederick R. Wilson.....                    519,444(/6/)                 3.7
All executive officers
 and directors as a
 group
 (10 persons)...........                  9,788,080                     66.6
<CAPTION>
Other Beneficial Owners of 5%
or More of ITXC's Common Stock
- ------------------------------
<S>                               <C>                              <C>            <C>
VocalTec Communications,
 Ltd....................                  2,783,954(/4/)(/7/)           19.9
Spectrum Equity Invest-
 ors II L.P.............                  2,346,580(/5/)(/8/)           16.8
Chase Venture Capital
 Associates, L.P........                  2,231,428(/9/)                15.9
Intel Corporation.......                  1,657,517(/10/)               11.8
DS Polaris Ltd..........                  1,016,273(/11/)                7.3
</TABLE>
- --------
* Represents less than one percent.


                                       63
<PAGE>


(1) The table above includes the following number of shares which the following
    persons may acquire pursuant to options and warrants held as of April 30,
    1999 and exercisable within 60 days of such date:

<TABLE>
   <S>                                                                   <C>
    Tom I. Evslin....................................................... 355,915
    John G. Musci.......................................................     --
    Edward B. Jordan.................................................... 217,302
    Mary A. Evslin...................................................... 355,915
    Steven J. Ott.......................................................  58,334
    Bradley E. Miller...................................................  33,334
    All executive officers and directors as a group..................... 698,219
</TABLE>

   The table above excludes:

    . options covering 15,000 shares of common stock which were granted to
      Mr. Evslin on June 8, 1999 and which were exercisable as of the date
      of grant;

    . options covering 250,000 shares of common stock granted to Mr. Musci
      in February 1999 which will vest on the earliest of the date on which
      a change in control of his former employer, Quest Communications
      International, occurs, the seventh anniversary of the date on which
      the options were granted and such other date as is provided for in
      our stock incentive plan;

    . options covering 100,000 shares of common stock granted to Mr. Jordan
      in February 1999 which will vest upon the consummation of the
      offerings; and

    . options covering an additional 500,000 shares of common stock granted
      to Mr. Musci, an additional    shares of common stock granted to
      Mr. Jordan and an additional   shares granted to other executive
      officers, all of which were granted on or before April 30, 1999 and
      will not vest prior to June 29, 1999.

 (2) Tom I. Evslin and Mary A. Evslin are married to each other. Each may be
     deemed to be the beneficial owner of the other's shares. The table or
     footnote above reflects, for each of Tom I. Evslin and Mary A. Evslin, the
     shares of common stock that Mr. Evslin owns, the shares of common stock
     that Ms. Evslin owns, the shares of common stock that they own jointly and
     the shares of common stock which each of them may purchase on or before
     June 29, 1999 upon the exercise of options and warrants. With the
     exception of shares held as joint tenants, each of Tom I. Evslin and Mary
     A. Evslin disclaim beneficial ownership of the shares owned of record by
     the other. Their principal business address is 600 College Road East,
     Princeton, New Jersey 08540.

 (3) Tom I. Evslin and Edward B. Jordan are each investors in Flatiron
     Associates, LLC, a fund described in note 6 below. Mr. Evslin is deemed to
     be the beneficial owner of 326 shares of the common stock owned by
     Flatiron Associates, LLC and Mr. Jordan is deemed to be the beneficial
     owner of 652 shares of the common stock owned by Flatiron Associates, LLC,
     representing their respective percentage interests in that entity.

 (4) This number represents 2,783,954 shares of common stock beneficially owned
     by VocalTec Communications, Ltd. Mr. Ganor is the Chairman of the Board of
     VocalTec Communications, Ltd. Mr. Ganor disclaims beneficial ownership of
     these shares.

 (5) This number represents 2,324,500 shares of common stock beneficially owned
     by Spectrum Equity Investors II, L.P. and 22,080 shares of common stock
     beneficially

                                       64
<PAGE>

    owned by SEA 1998 II, L.P. Mr. Collatos is a managing general partner of
    Spectrum Equity Investors II, L.P. and an affiliate of SEA 1998 II, L.P.
    Mr. Collatos disclaims beneficial ownership of these shares, except to the
    extent of his pecuniary interest therein.

 (6) This number represents 296,188 shares of common stock beneficially owned
     by The fl@tiron Fund LLC, 202,584 shares of common stock beneficially
     owned by The Flatiron Fund 1998/99, LLC and 20,672 shares of common stock
     beneficially owned by Flatiron Associates, LLC. Mr. Wilson is a manager
     of The fl@tiron Fund LLC, The Flatiron Fund 1998/99, LLC and Flatiron
     Associates, LLC. Mr. Wilson disclaims beneficial ownership of these
     shares, except to the extent of his pecuniary interest therein.

 (7) The principal business address of VocalTec Communications is 25
     Industrial Parkway, Northvale, New Jersey 07647.

 (8) The principal business address of Spectrum Equity Investors II, L.P. is
     One International Place, Boston, Massachusetts 02110.

 (9) The principal business address of Chase Venture Capital Associates, L.P.
     is 380 Madison Avenue, New York, New York 10017.

(10) The principal business address of Intel Corporation is 2200 Mission
     College Boulevard, Santa Clara, California 95052.

(11) This number represents 18,709 shares of common stock beneficially owned
     by DS Polaris Ltd., 369,464 shares of common stock beneficially owned by
     Polaris Fund II (Tax Exempt Investors), LLC, 243,846 shares of common
     stock beneficially owned by Polaris Fund II, LLC, 92,366 shares of common
     stock beneficially owned by Polaris Fund II, L.P., 217,056 shares of
     common stock beneficially owned by DS Polaris Trust Company (foreign
     residents) (1997), Ltd. and 74,832 shares of common stock beneficially
     owned by Canada-Israel Opportunity Fund L.P. We have been informed that
     DS Polaris Ltd. is the manager of Polaris Fund II (Tax Exempt Investors)
     LLC and Polaris Fund II, LLC, the general partner of Polaris Fund II,
     L.P. and DS Polaris Trust Company (foreign residents) (1997), Ltd. and an
     affiliate of Canada-Israel Opportunity Fund L.P. The principal business
     address of DS Polaris Ltd. is 37 Shaun Hamelech Avenue, Tel Aviv, Israel.

                                      65
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

   This is a summary of the material terms and provisions of our capital stock
and we refer you to our second restated certificate of incorporation, which has
been filed as an exhibit to the registration statement of which this prospectus
is a part.

   As of June 10, 1999, our authorized capital stock consisted of 22,500,000
shares of common stock, par value $.001 per share, and 15,000,000 shares of
preferred stock, par value $.001 per share. On that date, our outstanding
capital stock consisted of 5,141,903 shares of common stock, 5,865,104 shares
of Series B convertible preferred stock and 3,229,975 shares of Series C
convertible preferred stock. No other shares of any class or series were issued
or outstanding as of June 10, 1999. In addition, the following shares of common
stock were reserved for issuance as of June 10, 1999:

  .  5,865,104 shares were reserved for issuance upon conversion of our
     Series B convertible preferred stock;

  .  3,229,975 shares were reserved for issuance upon conversion of our
     Series C convertible preferred stock;

  .  439,883 shares were reserved for issuance upon the exercise of warrants
     held by Tom I. Evslin and Edward B. Jordan at an exercise price of
     $1.705 per share;

  .  2,576,472 shares were reserved for issuance upon exercise of outstanding
     stock options granted under our stock incentive plan;

  .  544,125 shares were reserved for issuance upon the exercise of stock
     options or other benefits which may be granted under our stock incentive
     plan; and

  .  250,000 shares were reserved for issuance under our employee stock
     purchase plan.

   Upon the closing of the offerings, each share of Series B convertible
preferred stock and Series C convertible preferred stock will be automatically
converted into one share of our common stock. In addition, upon the closing of
the offerings, we intend to amend and restate our certificate of incorporation
and by-laws. The description that follows gives effect to these issuances and
the intended amendments, which amendments will, among other things, increase
the number of authorized shares of common stock to 67,500,000 shares and
provide for 15,000,000 authorized shares of preferred stock.

Common Stock

   Voting Rights. Each holder of shares of our common stock is entitled to one
vote per share on all matters to be voted on by stockholders. Holders of common
stock are not entitled to cumulate votes in the election of directors.

   Dividend Rights. The holders of common stock are entitled to dividends and
other distributions if, as and when declared by our board of directors out of
assets legally available therefor, subject to the rights of any holder of
preferred stock. See "Dividend Policy."


                                       66
<PAGE>

   Other Rights. Upon the liquidation, dissolution or winding up of ITXC, the
holders of shares of common stock would be entitled to share pro rata in the
distribution of all of our assets remaining available for distribution after
satisfaction of all of our liabilities and the payment of the liquidation
preference of any outstanding preferred stock. The holders of our common stock
have no preemptive or other subscription rights to purchase shares of ITXC. No
share of our common stock issued in connection with or outstanding prior to the
offerings is subject to any further call or assessment.

Preferred Stock

   Our board of directors has the authority, without further action by the
stockholders, to issue our authorized and unissued shares of preferred stock in
one or more series and to fix the number of shares, designations, voting
powers, preferences, optional and other special rights and the restrictions or
qualifications relating to each such series. The rights, preferences,
privileges and powers of each series of preferred stock may differ with respect
to dividend rates, amounts payable on liquidation, voting rights, conversion
rights, redemption provisions, sinking fund provisions and other matters. The
issuance of shares of preferred stock could decrease the amount of earnings and
assets available for distribution to holders of shares of common stock and
could adversely affect the rights and powers, including voting rights, of
holders of shares of common stock. The existence of authorized and undesignated
shares of preferred stock may also have an adverse effect on the market price
of the common stock. While we have no present intention to issue shares of
preferred stock, any such issuance of preferred stock could have the effect of
delaying, deferring or preventing a change of control of ITXC.

Registration Rights

   Under a registration rights agreement, certain of our stockholders have the
right, under certain circumstances and subject to certain conditions, to
require us to register under the Securities Act shares of our common stock held
by them. Subject to certain conditions and exceptions, such investors also have
the right to require that shares of common stock held by them be included in
any registration under the Securities Act commenced by us. No such stockholder
has requested to register its shares of common stock in the offerings. The
registration rights agreement provides that we will pay all expenses in
connection with the registrations requested by such stockholders. The
registration rights agreement also provides that we will indemnify the
stockholders for certain liabilities they may incur under the securities laws.

   In addition, under the agreement forming our South American joint venture,
our joint venture partners have the right, under certain circumstances and
subject to certain conditions, to cause us to register under the Securities Act
of 1933 up to 25% of the shares of our common stock that they may acquire
pursuant to the buy-out provisions of our joint venture agreement.

Certain Change of Control Provisions

   We are a Delaware corporation and are subject to Section 203 of the Delaware
General Corporation Law, an anti-takeover law. In general, Section 203
prohibits a publicly held

                                       67
<PAGE>


Delaware corporation from engaging in certain business combinations with a 15%
stockholder for a period of three years following the date the person became a
15% stockholder, unless, with certain exceptions, the business combination or
the transaction in which the person became a 15% stockholder is approved in a
prescribed manner. Generally, the business combinations covered by this statute
include a merger, asset or stock sale, or other transaction resulting in a
financial benefit to the 15% stockholder. In determining whether a stockholder
is a 15% stockholder, the Delaware statute generally includes the voting shares
owned by the stockholder and the stockholder's affiliates and associates.

   The authorization of undesignated preferred stock makes it possible for our
board of directors to issue preferred stock with voting or other rights or
preferences that could impede the success of any attempt to change control of
ITXC.

   Our certificate of incorporation will provide for staggered terms for
members of our board of directors and will eliminate the right of shareholders
to act without a meeting. Additionally, our by-laws will establish an advance
notice procedure for stockholder proposals and for nominating candidates for
election as directors. The amendment of any of these provisions would require
approval of at least two-thirds of the outstanding common stock.

   The above-mentioned provisions of Delaware law and of our certificate of
incorporation and by-laws may have the effect of delaying, deterring or
preventing a change in control of ITXC, may discourage bids for the common
stock at a premium over the prevailing market price, and may adversely affect
the market price, and the voting and other rights of the holders, of the common
stock.

Transfer Agent and Registrar

   The Transfer Agent and Registrar for our common stock will be Continental
Stock Transfer and Trust Company.

                                       68
<PAGE>

                        SHARES ELIGIBLE FOR FUTURE SALE

   Upon the consummation of the offerings, we will have      shares of common
stock issued and outstanding. All of the      shares of common stock to be sold
in the offerings and any shares sold upon exercise of the underwriters' over-
allotment options will be freely tradable without restrictions or further
registration under the Securities Act, except for any shares purchased by an
affiliate of ITXC as the term affiliate is defined in Rule 144 under the
Securities Act, which shares will be subject to the resale limitations of Rule
144. After the completion of the offerings, all of our outstanding shares of
common stock other than the shares offered hereby will be restricted securities
as the phrase restricted securities is defined in Rule 144 and will be subject
to certain restrictions on disposition. Restricted securities may be sold in
the public market only if registered or if they qualify for an exemption from
registration under Rule 144 or Rule 701 under the Securities Act. Sales of
restricted securities in the public market, or the availability of such shares
for sale, could have an adverse effect on the price of the common stock.

   In general, under Rule 144, as currently in effect, a person (or persons
whose shares are required to be aggregated) who has beneficially owned shares
of common stock for at least one year, including a person who may be deemed an
affiliate of ITXC for Rule 144 purposes, is entitled to sell, within any three-
month period, a number of shares that does not exceed the greater of one
percent of the total number of outstanding shares of the class of stock sold or
the average weekly reported trading volume of the class of stock being sold
during the four calendar weeks preceding such sale. A person who is not deemed
an affiliate of ITXC for Rule 144 purposes at any time during the three months
preceding a sale and who has beneficially owned shares for at least two years
is entitled to sell such shares under Rule 144 without regard to the volume
limitations as described above. As defined in Rule 144, an affiliate of an
issuer is a person that directly or indirectly through the use of one or more
intermediaries controls, is controlled by, or is under common control with,
such issuer. The foregoing summary of Rule 144 is not intended to be a complete
description of that Rule.

   Existing stockholders, including directors and executive officers of ITXC,
who, after the offerings, will hold in the aggregate           shares of common
stock, have signed lock-up agreements. Subject to certain exceptions, those
stockholders have agreed that for a period of 180 days after the date of this
prospectus they will not offer, sell, contract to sell or otherwise dispose of
any shares of common stock or securities exercisable or exchangeable for common
stock or enter into any derivative transaction with similar effect as a sale of
common stock, unless they receive the prior written consent of Lehman Brothers
Inc.

   Subject to certain limitations on the aggregate offering price of a
transaction and other conditions, Rule 701 may be relied upon with respect to
the resale of securities originally purchased from us by our employees,
directors, officers, consultants or advisors prior to the date we become
subject to the reporting requirements of the Securities Exchange Act of 1934,
as amended, under written compensatory benefit plans or written contracts
relating to the compensation of these persons. In addition, Rule 701 will apply
to certain stock options granted by us before we became subject to the
reporting requirements of the Securities

                                       69
<PAGE>


Exchange Act, along with the shares acquired upon exercise of these options
(including exercises after the date of the offerings). Securities issued in
reliance on Rule 701 are restricted securities and, commencing 90 days after we
become subject to the reporting requirements of Section 13 or 15(d) of the
Exchange Act, subject to the contractual restrictions described above, may be
sold by:

  .  persons other than affiliates, subject only to the manner of sale
     provisions set forth in Rule 144, and

  .  by affiliates, under Rule 144 without compliance with its one-year
     minimum holding period requirements.

   Except as indicated above, we are unable to estimate the amount, timing and
nature of future sales of outstanding common stock. Prior to the offerings,
there has been no public market for the common stock, and no prediction can be
made as to the effect, if any, that market sales of shares of common stock or
the availability of shares of sale will have on the market price of the common
stock prevailing at any given time. Nevertheless, sales of significant numbers
of shares of common stock in the public market could adversely affect the
market price of the common stock and could impair our ability to raise capital
through an offering of our equity securities. See "Underwriting."

                                       70
<PAGE>

        CERTAIN U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS

   The following summary describes the material United States federal income
and estate tax consequences of the ownership of ITXC common stock by a Non-U.S.
Holder (as defined below). This discussion does not address all aspects of
United States federal income and estate taxes and does not deal with foreign,
state and local consequences that may be relevant to such non-U.S. holders in
light of their personal circumstances. Furthermore, the discussion below is
based upon the provisions of United States federal income tax law and
regulations, rulings and judicial decisions thereunder as of the date hereof,
and such authorities may be repealed, revoked or modified so as to result in
United States federal income tax consequences different from those discussed
below. Persons considering the purchase, ownership or disposition of common
stock should consult their own tax advisors concerning the United States
federal income tax consequences in light of their particular situations as well
as any consequences arising under the laws of any other taxing jurisdiction.

   As used herein, U.S. holder means a holder of ITXC common stock that is:

  .  a citizen or resident of the United States (or someone treated as a
     United States citizen or resident individual for United States federal
     income tax purposes),

  .  a corporation or partnership created or organized (or treated as created
     or organized for United States federal income tax purposes) in or under
     the laws of the United States or any political subdivision thereof,

  .  an estate the income of which is subject to United States federal income
     taxation regardless of its source,

  .  a trust the administration of which is subject to the primary
     supervision of a court within the United States and the control of one
     or more United States persons as described in section 7701(a)(30) of the
     Internal Revenue Code of 1986 or

  .  a trust that has a valid election in effect under applicable U.S.
     Treasury regulations to be treated as a domestic trust.

   As used herein, non-U.S. holder means a holder of ITXC common stock that
does not fit within the description of a U.S. holder above.

Dividends

   Dividends paid to a non-U.S. holder of ITXC common stock generally will be
subject to withholding of U.S. federal income tax at a 30% rate or such lower
rate as may be specified by an applicable income tax treaty. However, dividends
that are effectively connected with the conduct of a trade or business by the
non-U.S. holder within the United States and, where a tax treaty applies, are
attributable to a United States permanent establishment of the non-U.S. holder,
are not subject to the withholding tax, but instead are subject to United
States federal income tax on a net income basis at applicable graduated
individual or corporate rates. Certain certification and disclosure
requirements must be satisfied in order

                                       71
<PAGE>


for such effectively connected dividends to be exempt from withholding. Any
such effectively connected dividends received by a foreign corporation may,
under certain circumstances, be subject to an additional branch profits tax at
a 30% rate or such lower rate as may be specified by an applicable income tax
treaty.

   Until January 1, 2001, dividends paid to an address outside the United
States are presumed to be paid to a resident of such country, unless the payer
has knowledge to the contrary, for purposes of the withholding tax discussed
above and, under the current interpretation of United States Treasury
regulations, for purposes of determining the applicability of a tax treaty
rate. However, under United States Treasury regulations, a non-U.S. holder of
ITXC common stock who wishes to claim the benefit of an applicable treaty rate
and avoid back-up withholding for dividends paid after December 31, 2000 will
be required to satisfy applicable certification and other requirements.

   A non-U.S. holder of ITXC common stock eligible for a reduced rate of United
States withholding tax pursuant to an income tax treaty may obtain a refund of
any excess amounts withheld by filing an appropriate claim for refund with the
Internal Revenue Service.

Gain on Disposition of Common Stock

   A non-U.S. holder generally will not be subject to United States federal
income tax with respect to gain recognized on a sale or other disposition of
ITXC common stock unless:

  (1) the gain is effectively connected with a trade or business of the Non-
      U.S. Holder in the United States, and, where a tax treaty applies, is
      attributable to a United States permanent establishment of the non-U.S.
      holder,

  (2) in the case of a non-U.S. holder who is an individual and holds the
      ITXC common stock as a capital asset, such holder is present in the
      United States for 183 or more days in the taxable year of the sale or
      other disposition and certain other conditions are met, or

  (3) ITXC is or has been treated as a U.S. real property holding corporation
      for United States federal income tax purposes.

   An individual non-U.S. holder described in clause (1) above will be subject
to tax on the net gain derived from the sale under regular graduated United
States federal income tax rates. An individual non-U.S. holder described in
clause (2) above will be subject to a flat 30% tax on the gain derived from the
sale, which may be offset by United States source capital losses (even though
the individual is not considered a resident of the United States). If a non-
U.S. holder that is a foreign corporation falls under clause (1) above, it will
be subject to tax on its gain under regular graduated United States federal
income tax rates and, in addition, may be subject to the branch profits tax
equal to 30% of its effectively connected earnings and profits within the
meaning of the Internal Revenue Code for the taxable year, as adjusted for
certain items, unless it qualifies for a lower rate under an applicable income
tax treaty.


                                       72
<PAGE>


   ITXC believes it is not and does not anticipate becoming a U.S. real
property holding corporation for United States federal income tax purposes. If
ITXC is or becomes a U.S. real property holding corporation, so long as the
ITXC common stock continues to be regularly traded on an established securities
market, only a non-U.S. holder who holds or held, at any time during the
shorter of the five year period preceding the date of disposition or the
holder's holding period, more than five percent of the ITXC common stock will
be subject to U.S. federal income tax on the disposition of the ITXC common
stock.

   Special rules may apply to certain non-U.S. holders, such as entities which
are treated as controlled foreign corporations, passive foreign investment
companies or foreign personal holding companies under the Internal Revenue
Code. Such entities should consult their own tax advisors to determine the U.S.
federal, state, local and other tax consequences that may be relevant to them
and their beneficial owners.

Federal Estate Tax

   ITXC common stock held by an individual non-U.S. holder at the time of death
will be included in such holder's gross estate for United States federal estate
tax purposes, unless an applicable estate tax treaty provides otherwise.

Information Reporting and Backup Withholding

   ITXC must report annually to the IRS and to each non-U.S. holder the amount
of dividends paid to such holder and the tax withheld with respect to such
dividends, regardless of whether withholding was required. Copies of the
information returns reporting such dividends and withholding may also be made
available to the tax authorities in the country in which the non-U.S. holder
resides under the provisions of an applicable income tax treaty.

   Until January 1, 2001, backup withholding at the rate of 31% generally will
not apply to dividends paid to a non-U.S. holder at an address outside the
United States unless the payer has knowledge that the payee is a U.S. person.
From January 1, 2001 and thereafter, however, a non-U.S. holder will be subject
to back-up withholding unless applicable certification requirements are met.

   Payment of the proceeds of a sale of ITXC common stock by or through a
United States office of a broker is subject to both backup withholding and
information reporting unless the beneficial owner certifies under penalties of
perjury that it is a non-U.S. holder or otherwise establishes an exemption. In
general, backup withholding and information reporting will not apply to a
payment of the proceeds of a sale of ITXC common stock by or through a foreign
office of a broker. If, however, such broker is for United States federal
income tax purposes a U.S. person, a controlled foreign corporation, or a
foreign person that derives 50% or more of its gross income for a certain
period from the conduct of a trade or business in the United States, or, for
taxable years beginning after December 31, 2000, a foreign partnership in which
one or more United States persons, in the aggregate, own more than 50% of the
income or capital interests in the partnership or if the partnership is engaged
in a trade or business in the United States, such payments will be subject to
information reporting, but not backup withholding, unless:


                                       73
<PAGE>


  .  such broker has documentary evidence in its records that the beneficial
     owner is a non-U.S. holder and certain other conditions are met, or

  .  the beneficial owner otherwise establishes an exemption.

   Any amounts withheld under the backup withholding rules may be allowed as a
refund or a credit against such holder's U.S. federal income tax liability
provided the required information is furnished to the IRS.

                                       74
<PAGE>

                                  UNDERWRITING

   Subject to the terms and conditions stated in the underwriting agreement
dated the date hereof, the underwriters of the offering in the United States
and Canada named below, for whom Lehman Brothers Inc., CIBC World Markets Corp.
and First Analysis Securities Corporation are acting as U.S. representatives,
and the underwriters of the concurrent offering outside the United States and
Canada named below, for whom Lehman Brothers International (Europe), CIBC World
Markets International Limited and First Analysis Securities Corporation are
acting as international representatives, severally agreed to purchase, and we
have agreed to sell to the underwriters, the number of shares of common stock
set forth opposite the name of each underwriter.

<TABLE>
<CAPTION>
                                                                         Number
   U.S. Underwriters                                                    of shares
   -----------------                                                    ---------
   <S>                                                                  <C>
     Lehman Brothers Inc...............................................
     CIBC World Markets Corp...........................................
     First Analysis Securities Corporation.............................





                                                                           ---
   Total...............................................................
                                                                           ===
<CAPTION>
                                                                         Number
   International Underwriters                                           of shares
   --------------------------                                           ---------
   <S>                                                                  <C>
     Lehman Brothers International (Europe)............................
     CIBC World Markets International Limited..........................
     First Analysis Securities Corporation.............................





                                                                           ---
   Total...............................................................
                                                                           ===
</TABLE>

   We refer to the U.S. underwriters and international underwriters as the
underwriters and the U.S. representatives and international representatives as
the representatives. The underwriting agreement provides that the obligations
of the several underwriters to purchase the shares included in the offerings
are subject to approval of legal matters by counsel as well as to other
conditions. The underwriters are obligated to purchase all the shares (other
than those covered by the over-allotment option described below) if they
purchase any of the shares. The offering price and underwriting discounts and
commissions per share for the U.S. offering and the international offering are
identical. The closing of the U.S. offering is a condition to the closing of
the international offering and the closing of the international offering is a
condition to the closing of the U.S. offering.


                                       75
<PAGE>

   The underwriters propose to offer some of the shares directly to the public
at the public offering price set forth on the cover page of this prospectus and
some of the shares to certain dealers at the public offering 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 on sales
to certain other dealers. If all of the shares are not sold at the initial
offering price, the representatives may change the public offering price and
the other selling terms. The representatives have advised us that the
underwriters do not intend to confirm any sales to any accounts over which they
exercise discretionary authority without the prior written approval of the
customer.

   We have granted to the U.S. underwriters a 30-day option to purchase up to
     additional shares of our common stock and the international underwriters a
30-day option to purchase up to     additional shares of our common stock, in
each case at the public offering price less the underwriting discount. The
underwriters may exercise these options solely for the purpose of covering
over-allotments, if any, in connection with the offerings. To the extent these
options are exercised, each underwriter will be obligated, subject to various
conditions, to purchase a number of additional shares approximately
proportionate to its initial purchase commitment.

   We, our executive officers and directors and, with certain limited
exceptions, all of our other existing stockholders have agreed not to do any of
the following, whether any transaction described in clause (1), (2) or (3)
below is to be settled by delivery of common stock or other securities, in cash
or otherwise, in each case without the prior written consent of Lehman
Brothers, on behalf of the underwriters, for a period of 180 days after the
date of this prospectus:

  (1) offer, sell, pledge, or otherwise dispose of, or enter into any
      transaction or device which is designed or could be expected to, result
      in the disposition by any person at any time in the future of, any
      shares of common stock or securities convertible into or exchangeable
      for common stock or substantially similar securities, other than any of
      the following:

    .  the common stock sold under this prospectus;

    .  the common stock to be issued concurrent with the closings upon the
       mandatory conversion of our outstanding preferred stock;

    .  shares of common stock we issue pursuant to employee benefit plans,
       qualified stock option plans or other employee compensation plans
       existing on the date of this prospectus or pursuant to currently
       outstanding options, warrants or rights; and

    .  shares of common stock that we may be required to issue in the event
       that we exercise our right to acquire the 51% equity interest in our
       South American joint venture that we do not currently own.

  (2) sell or grant options, rights or warrants with respect to any shares of
      our common stock or securities convertible into or exchangeable for our
      common stock or

                                       76
<PAGE>


     substantially similar securities, other than the grant of options
     pursuant to benefit plans existing on the date hereof; and

  (3) enter into any swap or other derivatives transaction that transfers to
      another, in whole or in part, any of the economic benefits of risks or
      ownership of shares of common stock.

   The U.S. underwriters and the international underwriters have entered into
an agreement among U.S. underwriters and international underwriters, under
which each U.S. underwriter has agreed that, as part of the distribution of the
shares of common stock offered in the U.S. offering:

  .  it is not purchasing any of these shares for the account of anyone other
     than a person who is deemed to be a U.S. person under the definition
     that we have set forth below; and

  .  it has not offered or sold, will not offer, sell, resell or deliver,
     directly or indirectly, any of these shares or distribute any prospectus
     relating to the U.S. offering to anyone other than a U.S. person.

   In addition, pursuant to the agreement among U.S. underwriters and
international underwriters, each international underwriter has agreed that, as
part of the distribution of the shares of common stock offered in the
international offering:

  .  it is not purchasing any of the shares for the account of a U.S. person;
     and

  .  it has not offered or sold, and will not offer, sell, resell or deliver,
     directly or indirectly, any of these shares or distribute any prospectus
     relating to the international offering to any U.S. person.

   The limitations described above do not apply to stabilization transactions
or to other transactions specified in the underwriting agreement and the
agreement among U.S. underwriters and international underwriters, including

  .  some purchases and sales between U.S. underwriters and international
     underwriters;

  .  some offers, sales, resales, deliveries or distributions to or through
     investment advisors or other persons exercising investment discretion;

  .  purchases, offers or sales by a U.S. underwriter who is also acting as
     an international underwriter or by an international underwriter that is
     also acting as a U.S. underwriter; and

  .  other transactions specifically approved by the U.S. representatives and
     the international representatives.

   As used in this section, the term U.S. person means any resident or national
of the United States or Canada, any corporation, partnership or other entity
created or organized in or under the laws of the United States or Canada, or
any estate or trust the income of which is subject to United States or Canadian
federal income taxation regardless of the source, the term United States means
the United States of America (including the District of Columbia)

                                       77
<PAGE>


and its territories, its possessions and other areas subject to its
jurisdiction, and the term Canada means Canada, its provinces, its territories,
its possessions and other areas subject to its jurisdiction.

   At our request, the underwriters have reserved for sale, at the initial
offering price, up to   shares of common stock offered by this prospectus for
our directors, officers, employees and related persons. The number of shares of
common stock available for sale to the public will be reduced to the extent
these persons purchase such reserved shares. Any reserved shares which are not
purchased by these persons will be offered by the underwriters to the general
public on the same basis as the other shares offered by this prospectus.

   Prior to the offerings, there has been no public market for the shares of
common stock. The initial public offering price will be negotiated between the
representatives and us. In determining the initial public offering price of the
common stock, the representatives will consider, among other things and in
addition to prevailing market conditions, our historical performance and
capital structure, estimates of our business potential and earnings prospects,
an overall assessment of our management and the consideration of the above
factors in relation to market valuation of companies in related businesses.

   We have applied to list our common stock on the Nasdaq National Market under
the symbol "ITXC".

   Any offer of the shares of common stock in Canada will be made only pursuant
to an exemption from the prospectus filing requirement and an exemption from
the dealer registration requirement (where such an exemption is not available,
offers shall be made only by a registered dealer) in the relevant Canadian
jurisdiction where any such offer is made.

   Each international underwriter has represented and agreed to all of the
following:

  .  It has not offered or sold and, prior to the date six months after the
     date of issue of the shares of common stock, will not offer or sell any
     shares of common stock to persons in the United Kingdom by means of any
     document, other than to persons whose ordinary business it is to buy and
     sell securities or debentures, whether as principal or agent, or in
     circumstances that do not constitute an offer to the public within the
     meaning of Public Offers of Securities Regulations 1995.

  .  It has complied and will comply with all applicable provisions of the
     Financial Services Act 1986 with respect to anything done by it in
     relation to the shares of common stock in, from or otherwise involving
     the United Kingdom.

  .  It has only issued or passed on, and will only issue or pass on, to any
     person in the United Kingdom any document received by it in connection
     with the issue of the shares of common stock if that person is of a kind
     described in Article 11(3) of the Financial Services Act 1986
     (Investment Advertisements) (Exemptions) Order 1996 or is a person to
     whom such document may otherwise be issued or passed upon and that it
     will procure that any purchaser from it of any shares of common stock
     undertakes to comply with the provisions of this paragraph.


                                       78
<PAGE>

   Pursuant to the agreement among the U.S. underwriters and international
underwriters, sales may be made between the U.S. underwriters and the
international underwriters of a number of shares of common stock as may be
mutually agreed. The price of any shares so sold shall be the public offering
price as then in effect for the shares of common stock being sold by the U.S.
underwriters and the international underwriters less an amount equal to the
selling concession allocable to those shares of common stock, unless otherwise
determined by mutual agreement. To the extent that there are sales between the
U.S. underwriters and the international underwriters pursuant to the agreement
among the U.S. underwriters and the international underwriters, the number of
shares of common stock available for sale by the U.S. underwriters or by the
international underwriters may be more or less than the amount specified on the
cover page of this prospectus.

   In connection with the offerings, Lehman Brothers, on behalf of the
underwriters, may purchase and sell shares of our common stock in the open
market. These transaction may include over-allotment, syndicate covering
transactions and stabilizing transactions. Over-allotment involves syndicate
sales of common stock in excess of the number of shares to be purchased by the
underwriters in the offerings, which creates a syndicate short position.
Syndicate covering transactions involve purchases of our common stock in the
open market after the distribution has been completed in order to cover
syndicate short positions. Stabilizing transactions consist of certain bids or
purchases of our common stock made for the purpose of preventing or retarding a
decline in the market price of our common stock while the offerings are in
progress.

   The underwriters also may impose a penalty bid. Penalty bids permit the
underwriters to reclaim a selling concession from a syndicate member when
Lehman Brothers, in covering syndicate short positions or making stabilizing
purchases, repurchases shares originally sold by that syndicate member.

   Any of these activities may cause the price of our common stock to be higher
than the price that otherwise would exist in the open market in the absence of
such transactions. These transactions may be affected in the over-the-counter
market or otherwise and, if commenced, may be discontinued at any time.

   Purchasers of the shares of common stock offered in this prospectus may be
required to pay stamp taxes and other charges in accordance with the laws and
practices of the country of purchase, in addition to the offering price set
forth on the cover of this prospectus.

   We have agreed to indemnify the underwriters against liabilities, including
liabilities under the Securities Act of 1933, or to contribute to payments the
underwriters may be required to make in respect of any of those liabilities.

   Certain of the representatives and their affiliates may in the future
provide investment banking, financial advisory and other services to us for
which these representatives may receive customary fees and commissions.

                                       79
<PAGE>

                                 LEGAL MATTERS

   Certain legal matters relating to the offerings will be passed upon for us
by Lowenstein Sandler PC, Roseland, New Jersey. Certain legal matters relating
to the ITXC common stock will be passed upon for the U.S. underwriters and
international underwriters by Simpson Thacher & Bartlett, New York, New York.

                                    EXPERTS

   Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements at December 31, 1997 and 1998, and for the period from our
July 21, 1997 date of inception to December 31, 1997 and the year ended
December 31, 1998, as set forth in their report. Our financial statements are
included in the prospectus and elsewhere in the registration statement in
reliance on Ernst & Young LLP's report, given on their authority as experts in
accounting and auditing.

                             ADDITIONAL INFORMATION

   We have filed with the SEC 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 SEC. For further information pertaining to us
and the common stock to be sold in the offerings, reference is made to the
registration statement, including the exhibits thereto and the financial
statements and notes filed as a part thereof. This prospectus summarizes
material provisions of contracts and other documents to which we refer you.
Since this prospectus may not contain all of the information that you may find
important, you may desire to review the full text of these documents. We have
included copies of these documents as exhibits to our registration statement.

   On the closing of the offerings, 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 SEC. Such reports, proxy
statements and other information, as well as the registration statement and the
exhibits thereto, may be inspected, without charge, at the public reference
facility maintained by the SEC at Room 1024, Judiciary Plaza, 450 Fifth Street,
NW, Washington, D.C. 20549, and at the SEC'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 60661-2511. Please call
the SEC at 1-800-SEC-0330 for information regarding the public reference rooms.
Copies of such material may also be obtained from the Public Reference Section
of the SEC at 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed
rates. Such materials can also be inspected on the SEC's web site at
http://www.sec.gov.

                                       80
<PAGE>

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Report of Independent Auditors............................................  F-2

Consolidated Balance Sheets as of December 31, 1997 and 1998 and March 31,
 1999 (Unaudited).........................................................  F-3

Statements of Operations for the period from July 21, 1997 (date of
 inception) to December 31, 1997 and the year ended December 31, 1998 and
 the quarters ended March 31, 1998 and 1999 (Unaudited)...................  F-4

Statements of Stockholders' Equity for the period from July 21, 1997 (date
 of inception) to December 31, 1997 and the year ended December 31, 1998
 and the quarter ended March 31, 1999 (Unaudited).........................  F-5

Statements of Cash Flows for the period from July 21, 1997 (date of
 inception) to December 31, 1997 and the year ended December 31, 1998 and
 the quarters ended March 31, 1998 and 1999 (Unaudited)...................  F-6

Notes to Financial Statements.............................................  F-7
</TABLE>

                                      F-1
<PAGE>

                        Report of Independent Auditors

Board of Directors and Stockholders
ITXC Corp. and subsidiaries

  We have audited the accompanying consolidated balance sheets of ITXC Corp.
and subsidiaries as of December 31, 1998 and 1997, and the related
consolidated statements of operations, stockholders' equity (deficit) and cash
flows for the year ended December 31, 1998 and the period from July 21, 1997
(date of inception) to December 31, 1997. 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 consolidated financial position of ITXC Corp.
and subsidiaries at December 31, 1998 and 1997, and the results of their
operations and their cash flows for the year ended December 31, 1998 and the
period from July 21, 1997 (date of inception) to December 31, 1997 in
conformity with generally accepted accounting principles.

                                                          /s/ Ernst & Young LLP

Metropark, New Jersey
February 3, 1999, except for paragraphs
9 to 12 of Note 9 as to which the date
is February 24, 1999

                                      F-2
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

                          CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                   Pro forma
                                                                 stockholders'
                                                                    equity
                                 December 31         March 31,     March 31,
                                                                     1999
                               1997        1998        1999        (Note 12)
                             ---------  ----------  -----------  -------------
                                                    (Unaudited)   (Unaudited)
<S>                          <C>        <C>         <C>          <C>
Assets
Current assets:
  Cash and cash
   equivalents.............. $ 497,877  $3,971,237  $16,509,233
  Short-term investments-
   restricted...............        --     200,000      200,000
  Accounts receivable, net
   of allowance of $172,475
   in 1998 and $205,693 in
   1999.....................        --     500,739      769,103
  Prepaid expenses and other
   current assets...........    18,846     121,459      266,692
                             ---------  ----------  -----------
Total current assets........   516,723   4,793,435   17,745,028
Property and equipment,
 net........................   278,420   3,015,529    4,245,508
Deposits....................        --      24,833       24,621
                             ---------  ----------  -----------
Total assets................ $ 795,143  $7,833,797  $22,015,157
                             =========  ==========  ===========
Liabilities, mandatorily
 redeemable convertible
 preferred stock and
 stockholders' equity
 (deficit)
Current liabilities:
  Accounts payable.......... $ 167,261  $  831,275  $ 2,618,290
  Accrued liabilities and
   other current
   liabilities..............   135,000     786,043    1,129,925
  Deferred revenue..........        --     800,000      200,000
  Customer deposits.........        --     142,500      201,914
  Current portion of capital
   lease obligations........        --      76,705       76,705
                             ---------  ----------  -----------
Total current liabilities...   302,261   2,636,523    4,226,828
Equipment note payable......        --   1,200,000    1,723,191
Capital lease obligations,
 less current portion.......        --     160,368      136,509
Commitments and
 contingencies
Series B Redeemable
 Convertible Preferred
 Stock, $.001 par value,
 issued and outstanding,
 none in 1997; 5,865,104
 shares in 1998 and 1999;
 and pro forma none,
 $10,000,000 liquidation
 preference.................        --   9,866,723    9,872,054            --
Series C Redeemable
 Convertible Preferred
 Stock, $.001 par value,
 issued and outstanding,
 none in 1997 and 1998;
 3,229,975 shares in 1999;
 and pro forma none,
 $22,500,000 liquidation
 preference.................        --          --   15,039,699            --
Stockholders' equity
 (deficit):
 Series A Convertible
  Preferred Stock, $.001 par
  value, issued and
  outstanding, 278,000
  shares in 1997; none in
  1998 and 1999; and pro
  forma, none, $347,500
  liquidation preference....       278          --           --            --
 Common Stock, $.001 par
  value, authorized
  22,500,000 shares; issued
  and outstanding, 3,900,000
  shares in 1997; 4,190,500
  shares in 1998 and 1999;
  and pro forma 14,007,579
  shares ...................     3,900       4,191        4,191   $    14,008
 Additional paid-in
  capital................... 1,451,722   1,447,217    3,649,948    28,552,606
 Software credit
  subscription..............  (757,000)         --           --            --
 Deferred employee
  compensation..............        --          --   (2,212,493)   (2,212,493)
 Subscription receivable....      (900)         --           --            --
 Accumulated deficit........  (205,118) (7,481,225) (10,424,770)  (10,424,770)
                             ---------  ----------  -----------   -----------
Total stockholders' equity
 (deficit)..................   492,882  (6,029,817)  (8,983,124)  $15,929,351
                             =========  ==========  ===========   ===========
Total liabilities,
 mandatorily redeemable
 convertible preferred stock
 and stockholders' equity
 (deficit).................. $ 795,143  $7,833,797  $22,015,157
                             =========  ==========  ===========
</TABLE>

                            See accompanying notes.

                                      F-3
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                             Period from
                            July 21, 1997
                              (date of
                            inception) to  Year ended       Three months
                            December 31,  December 31,     ended March 31,
                                1997          1998        1998        1999
                            ------------- ------------  ---------  -----------
                                                             (Unaudited)
<S>                         <C>           <C>           <C>        <C>
Revenue:
  Telecommunications
   revenue................   $      --    $ 1,238,008   $     --   $ 2,429,413
  Consulting revenue......      500,000       300,000     300,000      600,000
                             ----------   -----------   ---------  -----------
Total revenue.............      500,000     1,538,008     300,000    3,029,413
Costs and expenses:
  Data communications and
   telecommunications.....          --      2,016,757         --     2,528,183
  Cost of consulting
   revenue................          --        192,203      30,000          --
  Network operations......          --      1,320,587     166,781      546,312
  Sales and marketing.....      349,100     2,517,752     374,580    1,008,506
  Development.............          --        594,104      53,583      182,554
  General and
   administrative.........      351,774     2,009,088     287,110    1,367,072
  Depreciation and
   amortization...........        5,000       344,587      18,551      278,136
  Non-cash employee
   compensation...........           --            --          --      103,684
                             ----------   -----------   ---------  -----------
Total costs and expenses..      705,874     8,995,078     930,605    6,014,447
                             ----------   -----------   ---------  -----------
Loss from operations......     (205,874)   (7,457,070)   (630,605)  (2,985,034)
Interest income...........          756       230,538         --        68,778
Interest expense..........          --        (49,575)        --       (27,289)
                             ----------   -----------   ---------  -----------
Net loss..................     (205,118)   (7,276,107)   (630,605)  (2,943,545)
Accretion of redemption
 value of mandatorily
 redeemable convertible
 preferred stock..........                    (14,217)                (113,446)
                             ----------   -----------   ---------  -----------
Net loss applicable to
 common stockholders......   $ (205,118)  $(7,290,324)  $(630,605) $(3,056,991)
                             ==========   ===========   =========  ===========
Basic and diluted net loss
 per share applicable to
 common stockholders......   $    (0.06)  $     (1.78)  $   (0.16) $     (0.73)
                             ==========   ===========   =========  ===========
Weighted average shares
 used in computation of
 basic and diluted net
 loss per share applicable
 to common stockholders...    3,502,454     4,092,278   3,900,000    4,190,500
Pro forma basic and
 diluted net loss per
 share (unaudited)........                $     (0.83)             $     (0.24)
                                          ===========              ===========
Weighted average shares
 used in computation of
 pro forma basic and
 diluted net loss per
 share (unaudited)........                  8,799,335               12,033,705
</TABLE>

                            See accompanying notes.

                                      F-4
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)

        Period from July 21, 1997 (date of inception) to March 31, 1999

<TABLE>
<CAPTION>
                   Series A Convertible
                      Preferred Stock        Common Stock   Additional    Software      Deferred
                   ----------------------- ----------------  Paid-in       Credit       Employee    Subscription Accumulated
                     Shares      Amount     Shares   Amount  Capital    Subscription  Compensation   Receivable    Deficit
                   -----------  ---------- --------- ------ ----------  ------------  ------------  ------------ ------------
<S>                <C>          <C>        <C>       <C>    <C>         <C>           <C>           <C>          <C>
 Issuance of
  Common Stock...           --        --   3,900,000 $3,900 $   27,000  $        --            --       (900)              --
 Issuance of
  Series A Stock
  and Preferred
  Warrant........      278,000  $    278          --     --    424,722           --            --         --               --
 Issuance of
  Common Warrants
  for software
  credit.........           --        --          --     --  1,000,000   (1,000,000)           --         --               --
 Utilization of
  software
  credit.........           --        --          --     --         --      243,000            --         --               --
 Net loss........           --        --          --     --         --           --            --         --     $   (205,118)
                   -----------  --------   --------- ------ ----------  -----------   -----------      -----     ------------
Balance, December
 31, 1997........      278,000       278   3,900,000  3,900  1,451,722     (757,000)           --       (900)        (205,118)
 Conversion of
  Series A Stock
  and Preferred
  Warrant to
  Common Stock...     (278,000)     (278)    278,000    278         --           --            --         --               --
 Repayment of
  subscription
  receivable.....           --        --          --     --       (900)          --            --        900               --
 Issuance of
  Common Stock
  for services...           --        --      12,500     13     10,612           --            --         --               --
 Utilization of
  software
  credit.........           --        --          --     --         --      757,000            --         --               --
 Accretion of
  redemption
  value of
  mandatorily
  redeemable
  convertible
  preferred
  stock..........           --        --          --     --    (14,217)          --            --         --               --
 Net loss........           --        --          --     --         --           --            --         --       (7,276,107)
                   -----------  --------   --------- ------ ----------  -----------   -----------      -----     ------------
Balance, December
 31, 1998........           --        --   4,190,500  4,191  1,447,217           --            --         --       (7,481,225)
 Accretion of
  redemption
  value of
  mandatorily
  redeemable
  convertible
  preferred stock
  (unaudited)....           --        --          --     --   (113,446)          --            --         --               --
 Deferred non-
  cash employee
  compensation
  (unaudited)....           --        --          --     --  2,316,177           --    (2,316,177)        --               --
 Amortization of
  non-cash
  deferred
  employee
  compensation
  (unaudited)....           --        --          --     --         --           --       103,684         --               --
 Net loss
  (unaudited)....           --        --          --     --         --           --            --         --       (2,943,545)
                   -----------  --------   --------- ------ ----------  -----------   -----------      -----     ------------
Balance, March
 31, 1999
 (unaudited).....           --  $     --   4,190,500 $4,191 $3,649,948  $        --   $(2,212,493)     $  --     $(10,424,770)
                   ===========  ========   ========= ====== ==========  ===========   ===========      =====     ============
<CAPTION>
                      Total
                   ------------
<S>                <C>
 Issuance of
  Common Stock...  $    30,000
 Issuance of
  Series A Stock
  and Preferred
  Warrant........      425,000
 Issuance of
  Common Warrants
  for software
  credit.........           --
 Utilization of
  software
  credit.........      243,000
 Net loss........     (205,118)
                   ------------
Balance, December
 31, 1997........      492,882
 Conversion of
  Series A Stock
  and Preferred
  Warrant to
  Common Stock...           --
 Repayment of
  subscription
  receivable.....           --
 Issuance of
  Common Stock
  for services...       10,625
 Utilization of
  software
  credit.........      757,000
 Accretion of
  redemption
  value of
  mandatorily
  redeemable
  convertible
  preferred
  stock..........      (14,217)
 Net loss........   (7,276,107)
                   ------------
Balance, December
 31, 1998........   (6,029,817)
 Accretion of
  redemption
  value of
  mandatorily
  redeemable
  convertible
  preferred stock
  (unaudited)....     (113,446)
 Deferred non-
  cash employee
  compensation
  (unaudited)....           --
 Amortization of
  non-cash
  deferred
  employee
  compensation
  (unaudited)....      103,684
 Net loss
  (unaudited)....   (2,943,545)
                   ------------
Balance, March
 31, 1999
 (unaudited).....  $(8,983,124)
                   ============
</TABLE>


                            See accompanying notes.

                                      F-5
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                             Period from
                            July 21, 1997
                              (date of                   Three months ended
                            inception) to  Year ended         March 31,
                            December 31,  December 31,  ----------------------
                                1997          1998        1998        1999
                            ------------- ------------  ---------  -----------
                                                             (Unaudited)
<S>                         <C>           <C>           <C>        <C>
Operating activities
Net loss..................    $(205,118)  $(7,276,107)  $(630,605) $(2,943,545)
Adjustments to reconcile
 net loss to net cash
 provided by (used in)
 operating activities:
  Depreciation and
   amortization...........        5,000       344,587      18,551      278,136
  Provision for doubtful
   accounts...............          --        172,475         --       312,294
  Amortization of non-cash
   deferred employee
   compensation...........          --            --          --       103,684
  Issuance of common stock
   for service............          --         10,625         --           --
  Changes in operating
   assets and liabilities:
    Increase in accounts
     receivable...........          --       (673,214)        --      (580,657)
    Increase in prepaid
     expenses and other
     assets...............      (18,846)     (127,446)    (39,112)    (145,021)
    Increase in accounts
     payable and accrued
     expenses.............      302,261     1,315,057     335,931    2,130,891
    Increase (decrease) in
     customer deposits and
     deferred revenue.....          --        942,500         --      (540,586)
                              ---------   -----------   ---------  -----------
Net cash provided by (used
 in) operating
 activities...............       83,297    (5,291,523)   (315,235)  (1,384,804)
Investing activities
Purchase of property and
 equipment................      (40,420)   (2,073,696)   (448,214)  (1,508,116)
Purchase of short-term
 investments..............          --       (200,000)        --           --
                              ---------   -----------   ---------  -----------
Net cash used in investing
 activities...............      (40,420)   (2,273,696)   (448,214)  (1,508,116)
Financing activities
Proceeds from equipment
 line of credit...........          --      1,200,000         --       523,191
Proceeds from stockholder
 note.....................          --        750,000     300,000          --
Repayment of capital lease
 obligations..............          --        (13,927)        --       (23,859)
Issuance of common stock..       30,000           900         --           --
Issuance of convertible
 preferred stock..........      425,000     9,101,606         --    14,931,584
                              ---------   -----------   ---------  -----------
Net cash provided by
 financing activities.....      455,000    11,038,579     300,000   15,430,916
                              ---------   -----------   ---------  -----------
Increase (decrease) in
 cash.....................      497,877     3,473,360    (463,449)  12,537,996
Cash and cash equivalents
 at beginning of period...          --        497,877     497,877    3,971,237
                              ---------   -----------   ---------  -----------
Cash and cash equivalents
 at end of period.........    $ 497,877   $ 3,971,237   $  34,428  $16,509,233
                              =========   ===========   =========  ===========
Supplemental disclosures
 of cash flow information
Cash paid for interest....          --    $    36,446         --   $    27,289
                              =========   ===========   =========  ===========
</TABLE>

                            See accompanying notes.


                                      F-6
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

            December 31, 1997, December 31, 1998 and March 31, 1999

  (All information as of March 31, 1999 and for the three month periods ended
                     March 31, 1999 and 1998 is unaudited)
1. Organization and Nature of Business

  ITXC Corp. (the "Company") is a Delaware corporation, incorporated on July
21, 1997. The Company was founded for the purpose of providing Internet voice,
fax and voice-enabled services primarily to traditional telephone companies,
Internet service providers and telecommunications resellers, under the brand
name WWeXchange SM for which revenues commenced in 1998. During 1997, the
Company was in the development stage and was primarily developing and
constructing its network, and provided consulting services under a market
trial agreement with a company in the telecommunications industry (see Note
9). During 1998 the Company exited the development stage. The Company operates
in one business segment.

 Subsidiaries and Joint Venture

  In March 1998, ITXC Data Transport Services LLC ("Data Transport"), a wholly
owned subsidiary, was formed for the purpose of holding licenses and
agreements with certain carriers and re-sellers and to acquire and operate
switching equipment for the Company.

  In July 1998, ITXC Asia PTE Ltd, a wholly-owned subsidiary (Singapore
company), was formed for the purpose of selling and marketing the Company's
services in Asia.

  In July 1998, the Company obtained a 49% interest in ITXC Comunicacoes Ltda
("ITXC Ltda"), a newly formed Brazilian joint venture, in consideration of
rights to certain technology, which will provide exchange carrier long-
distance services in Brazil. The Company's ownership interest in ITXC Ltda is
accounted for under the equity method of accounting. No investment has been
recorded by the Company as no consideration has been paid. The Company will
record its 49% share in the profits of ITXC Ltda when it becomes profitable
and to the extent prior losses are recouped. The Company is entitled to
receive a 4% royalty, based on ITXC Ltda revenue carried over the Company's
network, after a $1.47 million royalty threshold amount is reached and subject
to the elimination of intercompany income.

  The ITXC Ltda joint venture agreement, as amended, provides for an exit
clause triggered by an initial public offering of common stock by the Company
and certain other events. The clause provides the Company a call option and
provides TeleNova Communicacoes Ltda and its assignee (collectively,
"TeleNova") a put option which requires the Company to acquire TeleNova's
interest in ITXC Ltda at a price based on a formula, as defined in the
agreement. The formula price cannot be determined until ITXC Ltda's revenue
and gross profits for the six months ended August 31, 1999 are known. TeleNova
has waived its put right in connection with the Company's initial public
offering; however, both the Company and TeleNova maintain certain call and put
rights, respectively, upon the occurence of certain other future events.


                                      F-7
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

1. Organization and Nature of Business (continued)

Basis of Consolidation

  The consolidated financial statements include the accounts of ITXC Corp. and
its wholly-owned subsidiaries, Data Transport and ITXC Asia PTE, Ltd. All
significant intercompany balances and transactions have been eliminated in
consolidation.

2. Significant Accounting Policies

Cash Equivalents

  The Company considers all highly-liquid investments with a maturity of three
months or less when purchased to be cash equivalents.

Short-Term Investments

  Short-term investments consist of a certificate of deposit with a maturity
within one year of December 31, 1998. Such investment is classified as
available-for-sale and, accordingly, is carried at fair value which
approximates cost.

Concentration of Credit Risk

  The Company transacts a significant volume of business with several
customers. Four customers represented 25%, 19%, 16% and 14%, respectively, of
1998 total revenue and three customers represented 21%, 20% and 18%,
respectively, of total revenue for the three months ended March 31, 1999.
Accounts receivable from these customers were approximately $417,800 and
$448,500 at March 31, 1999, respectively. The Company performs a credit
evaluation of all new customers and requires certain customers to provide
collateral in the form of a cash deposit.

  For the period from July 21, 1997 to December 31, 1997, one customer
accounted for 100% of consulting revenue under the market trial agreement
referred to in the first paragraph of Note 1.

Depreciation and Amortization

  Property and equipment are recorded at cost and are depreciated over the
estimated useful lives and leasehold improvements are depreciated over the
term of the lease or over the estimated useful lives, whichever is shorter,
utilizing the straight-line method as follows:

<TABLE>
<CAPTION>
                                                                      Estimated
                                                                     Useful Life
                                                                     -----------
      <S>                                                            <C>
      Network equipment and software................................      3
      Furniture, fixtures and office equipment......................     3-7
      Leasehold improvements........................................      2
</TABLE>

                                      F-8
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


2. Significant Accounting Policies (continued)

Revenue Recognition

  The Company recognizes telecommunications revenue and the related costs at
the time the services are rendered. Telecommunications revenue is derived from
fees charged to terminate Internet based voice, fax and voice enabled services
over our network.

  The Company recognizes consulting revenue under a market trial agreement as
certain milestones are attained and cash collections are assured, as specified
in the contract, and in accordance with Statement of Financial Accounting
Standards, No. 68, Research and Development Arrangements. This agreement
requires certain research reports to be delivered by the Company and accepted
by the customer, for payments under the contract to become due and payable. At
December 31, 1998 and March 31, 1999, $800,000 and $200,000, respectively, of
revenue has been deferred in connection with this market trial agreement for
payments received in advance of delivery and acceptance of certain reports.

Advertising

  Advertising costs are expensed as incurred. During 1997, 1998 and the three
month periods ended March 31, 1998 and 1999, the Company expensed
approximately $14,000, $119,000, $59,000 and $11,000, respectively, of such
costs.

Income Tax

  Deferred income taxes are determined using the liability method in
accordance with Statement of Financial Accounting Standards No. 109,
Accounting for Income Taxes. Under this method, deferred tax assets and
liabilities are determined based on differences between financial reporting
and tax bases of assets and liabilities (i.e. temporary differences) and are
measured using the enacted tax rates and laws that will be in effect when the
differences are expected to reverse.

Stock-Based Compensation

  The Company accounts for employee stock-based compensation in accordance
with Accounting Principles Board (APB) Opinion No. 25, "Accounting for Stock
Issued to Employees", using an intrinsic value approach to measure
compensation expense, if any. Appropriate disclosures using a fair value based
method, as provided by Statement of Financial Accounting Standards No. 123,
"Accounting for Stock-Based Compensation" ("SFAS 123"), are also reflected in
the accompanying notes to the financial statements. Options issued to non-
employees are accounted for in accordance with SFAS 123, using a fair value
approach. The Company has not issued any options to non-employees.

                                      F-9
<PAGE>


                       ITXC CORP. AND SUBSIDIARIES

         NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


2. Significant Accounting Policies (continued)

Recent Accounting Pronouncements

  In March 1998, the American Institute of Certified Public Accountants issued
Statement on Position 98-1, "Accounting for the Cost of Computer Software
Developed or Obtained for Internal Use." SOP 98-1 is effective for financial
statements for years beginning after December 15, 1998. SOP 98-1 provides
guidance regarding accounting for computer software developed or obtained for
internal use, including the requirement to capitalize specified costs and
amortization of such costs. The Company does not expect the adoption of this
standard to have a significant impact on the Company's financial results.

  In April 1998, the American Institute of Certified Public Accountants
(AICPA) issued SOP 98-5, Reporting on the Costs of Start-Up Activities. SOP
98-5, effective for fiscal years beginning after December 15, 1998, which
provides guidance on the financial reporting of start-up costs and
organization costs. It requires costs of start-up activities and organization
costs to be expensed as incurred. As the Company expensed these costs as
incurred, the adoption of this standard will have no impact on the Company's
results of operations, financial position or cash flows.

  In June 1998, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards No. 133, Accounting for
Derivatives and Hedging Activities (SFAS 133), which establishes accounting
and reporting standards for derivative instruments, including certain
derivative instruments embedded in other contracts (collectively referred to
as derivatives) and for hedging activities. SFAS 133 is effective for all
fiscal quarters of fiscal years beginning after June 15, 1999. As the Company
does not currently engage in derivatives or hedging transactions, there will
be no current impact to the Company's results of operations, financial
position or cash flows upon the adoption of SFAS 133.

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 reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting periods. Actual results could differ from those estimates.

Interim Financial Statements

  The accompanying unaudited interim financial statements as of March 31, 1999
and for each of the three month periods ended March 31, 1998 and 1999 include
all adjustments which, in the opinion of management, are necessary for a fair
presentation of the Company's financial position, results of operations and
cash flows for the periods presented. All such

                                     F-10
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


2. Significant Accounting Policies (continued)

adjustments are of a normal recurring nature. The results of the Company's
operations for the three months ended March 31, 1998 and 1999 are not
necessarily indicative of the results of operations for a full fiscal year.

3. Accounts Receivable

  The Company estimates the amount of the allowance for doubtful accounts
required to reduce accounts receivable to expected net realizable value by
reviewing the status of significant past-due receivables and analyzing
historical bad debt trends.

  The Company did not write-off any accounts receivable during 1997, 1998 and
the three months ended March 31, 1998. The Company wrote-off approximately
$279,000 of accounts receivable during the three month period ended March 31,
1999.

4. Property and Equipment

  Property and equipment is comprised of the following:

<TABLE>
<CAPTION>
                                                  December 31,
                                               -------------------  March 31,
                                                 1997      1998       1999
                                               -------- ---------- -----------
                                                                   (Unaudited)
<S>                                            <C>      <C>        <C>
Network equipment and software................ $243,000 $1,955,887 $3,200,677
Furniture, fixtures and office equipment......   40,420  1,147,946  1,411,271
Leasehold improvements........................      --     261,283    261,283
                                               -------- ---------- ----------
                                                283,420  3,365,116  4,873,231
Less accumulated depreciation and
 amortization.................................    5,000    349,587    627,723
                                               -------- ---------- ----------
                                               $278,420 $3,015,529 $4,245,508
                                               ======== ========== ==========
</TABLE>

  Equipment under capital leases totaled approximately $251,000 at December
31, 1998 and March 31, 1999. Included in accumulated depreciation is
approximately $14,000 and $35,000 related to such assets at December 31, 1998
and March 31, 1999, respectively.

  At December 31, 1997 and 1998, network equipment and software includes
$243,000 and $1 million, respectively, of software which is used in internet
gateways and switches. This software was purchased from a stockholder, which
was paid for by issuance of common stock warrants (see Note 9). At December
31, 1998 and March 31, 1999, $733,000 and $330,000, respectively, of software
has not been deployed into operations; accordingly, depreciation of this
software will commence when it is placed into operations.

                                     F-11
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


5. Accrued Expenses

  Accrued liabilities and other current liabilities are comprised of the
following:

<TABLE>
<CAPTION>
                                                     December 31,
                                                   -----------------  March 31,
                                                     1997     1998      1999
                                                   -------- -------- -----------
                                                                     (Unaudited)
<S>                                                <C>      <C>      <C>
Compensation...................................... $ 31,095 $262,807 $  657,926
Accrued contract costs............................      --   300,000    180,000
Professional fees.................................   36,500      --         --
Repairs and maintenance costs.....................   16,000      --         --
Relocation costs..................................   30,500  100,000     95,585
Other.............................................   20,905  123,236    196,414
                                                   -------- -------- ----------
                                                   $135,000 $786,043 $1,129,925
                                                   ======== ======== ==========
</TABLE>

  Accrued contract costs represent the remaining minimum payments due under a
contract with a telecommunication vendor, which the Company terminated in
December 1998.

6. Income Taxes

  Due to operating losses, the Company has no income tax liability for 1997,
1998 or the three months ended March 31, 1999.

  Significant components of the Company's deferred tax assets and liabilities
at December 31, 1997 and 1998 and March 31, 1999 are as follows:

<TABLE>
<CAPTION>
                                                 December 31,
                                             ---------------------   March 31,
                                               1997       1998         1999
                                             --------  -----------  -----------
                                                                    (Unaudited)
<S>                                          <C>       <C>          <C>
Deferred tax assets:
  Net operating loss carryforward........... $ 66,632  $ 2,836,880  $ 3,711,637
  Other.....................................   13,971      189,754      367,110
                                             --------  -----------  -----------
                                               80,603    3,026,634    4,078,747
Less valuation allowance....................  (80,603)  (2,968,677)  (4,020,877)
                                             --------  -----------  -----------
Deferred tax asset..........................      --        57,957       57,870
Deferred tax liabilities:
  Fixed assets..............................      --       (57,957)     (57,870)
                                             --------  -----------  -----------
Net deferred tax asset...................... $    --   $       --   $       --
                                             ========  ===========  ===========
</TABLE>

                                      F-12
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


6. Income Taxes (continued)

  A reconciliation setting forth the differences between the effective tax
rate of the Company and the U.S. statutory rate is as follows:

<TABLE>
<CAPTION>
                                    December 31,                          March 31,
                          -----------------------------------  -----------------------------------
                               1997              1998               1998               1999
                          ---------------  ------------------  ----------------  -----------------
                                                                         (unaudited)
<S>                       <C>       <C>    <C>          <C>    <C>        <C>    <C>         <C>
Statutory federal income
 tax (benefit) at 34%...  $(69,740)  34.0% $(2,473,876)  34.0% $(214,406)  34.0% $ (963,662)  34.0%
State income tax
 (benefit), net of
 federal benefit........   (12,184)   5.9     (413,307)   5.6    (35,282)   5.6    (141,570)   5.0
Nondeductible expenses..       --     --         7,750   (0.1)     1,534   (0.2)      2,350   (0.1)
Other...................     1,321   (0.6)      (8,641)   0.2    (20,083)   3.2      50,682    1.8
Increase in valuation
 allowance..............    80,603  (39.3)   2,888,074  (39.7)   268,237  (42.6)  1,052,200  (37.1)
                          --------  -----  -----------  -----  ---------  -----  ----------  -----
Total...................  $    --     --   $       --     --   $     --     --   $      --     --
                          ========  =====  ===========  =====  =========  =====  ==========  =====
</TABLE>

  At December 31, 1998, the Company has a federal and state net operating loss
("NOL") carryforward of approximately $6.9 million. The federal NOL
carryforwards expire from 2012 to 2018. The state NOL carryforwards expire
from 2004 to 2005. The Company has not performed a detailed analysis to
determine whether an ownership change under Section 382 of the Internal
Revenue Code occurred, but believes that it is likely that such a change
occurred during 1998. The effect of an ownership change would be the
imposition of an annual limitation on the use of NOL carryforwards
attributable to periods before change. The Company has not determined the
amount of the potential limitation, but believes that all of the NOL will be
available for use within the carryforward period.

  The Company's existing deferred tax assets at December 31, 1997 and 1998,
and March 31, 1999 have been reduced by a valuation allowance of $80,603,
$2,968,677, and $4,020,877, respectively, due to the uncertainty regarding the
realization of such deferred tax assets.

7. Debt

  The Company has a revolving credit agreement with a bank, which provides for
maximum borrowings of $5 million, of which $4 million may be borrowed under an
equipment line of credit for the purchase of certain capital equipment. The
revolving line expires August 20, 1999, with available borrowings determined
based on a formula including accounts receivable. The equipment line expires
three years after the final draw down, which may be taken through June 30,
1999, with available borrowings determined based on a formula including
billable minutes. At December 31, 1998, the maximum available borrowings were
$1.4 million, of which $1.2 million is outstanding.

  The Company is contractually required to make an annual payment based on the
previous years' excess cash flow, as defined. The agreement also includes a
mandatory repayment clause requiring that the Company repay the balance
outstanding in the event that the Company consummates an initial pubic
offering with net proceeds of at least $20 million.


                                     F-13
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

7. Debt (continued)

  The revolving line bears interest at the greater of (i) the bank's prime
rate plus 0.5%, or (ii) the federal funds rate plus 1.5%. The equipment line
bears interest at the greater of (i) the bank's prime rate plus 0.75%, or (ii)
the federal funds rate plus 2.0%. The rate in effect at December 31, 1998
under the equipment line was 8.5%, representing the bank's prime rate plus
0.75%.

  Borrowings under the credit agreement are collateralized by substantially
all of the Company's assets and the Company is required to maintain restricted
cash balances of $200,000. In addition, the Company is required to maintain
compliance with certain financial covenants. As of December 31, 1998 the
Company was in violation of one financial covenant and has obtained a letter
from the bank waiving the violation at that date. Under the credit agreement,
commencing in 1999 the covenant that was violated becomes less restrictive. As
a result, the Company believes that it will maintain compliance with such
covenant throughout 1999.

  The fair value of the Company's debt approximates its carrying value.

8. Commitments and Contingencies

  The Company leases an office facility under a non-cancelable operating lease
which commenced June 15, 1998, has a term of five years and provides for
minimal annual base rental payments of $314,000. The Company may, at its
option, terminate the lease after 18 months or 36 months. The lease contains
one five year renewal option at the then applicable fair market rental rate.
In addition, the lease requires the Company to pay increases in real estate
taxes and other operating costs of the properties above base year amounts.
During 1998, the Company also entered into capital lease agreements for
furniture and equipment.

  Future minimum lease payments for noncancelable operating and capital leases
having initial or remaining terms in excess of one year are as follows:

<TABLE>
<CAPTION>
                                                             Operating Capital
                                                             --------- --------
<S>                                                          <C>       <C>
1999........................................................ $364,000  $ 95,436
2000........................................................  206,000    95,436
2001........................................................    8,000    79,530
2002........................................................    5,000       --
                                                                       --------
                                                                        270,402
Less amounts representing interest..........................             33,329
                                                                       --------
Present value of net minimum lease payments.................           $237,073
                                                                       ========
</TABLE>


                                     F-14
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


8. Commitments and Contingencies (continued)

  Rental expense for all operating leases was approximately $15,000, $217,000,
$26,000 and $80,000 in 1997 and 1998 and in the three month periods ended
March 31, 1998 and 1999, respectively.

 Legal Matters

  The Company is involved in certain claims and legal actions arising in the
normal course of business. Management does not expect that the outcome of
these cases will have a material effect on the Company's financial position or
results of operations.

9. Capital Stock

  On July 21, 1997, the Company issued 3,000,000 shares of Common Stock to its
founder and president for $30,000.

  On October 1, 1997, the Company issued 900,000 shares of Common Stock to an
investor for $900, which was paid subsequent to December 31, 1997. On October
1, 1997, the Company issued ten warrants to purchase an aggregate of 600,000
shares of Common Stock at par value to an investor in exchange for a software
credit in the amount of $1 million to be used within three years against the
purchase of products from the investor. Each warrant became exercisable for
each $100,000 of the software credit utilized by the Company. At December 31,
1998, $1 million of the software credit had been utilized by the Company for
the purchase of software, and, accordingly, all warrants were exercisable.
Also, on October 1, 1997, the Company sold to the same investor 278,000 shares
of Series A Convertible Preferred Stock (the "Series A Stock"), and a warrant
to purchase an additional 122,000 shares of Series A Stock (the "Preferred
Warrant") with an exercise price of par value, for aggregate proceeds of
$500,000.

  On April 27, 1998, in connection with the sale of the Series B Redeemable
Convertible Preferred Stock, all of the outstanding shares of Series A Stock
were converted into an equal number of shares of Common Stock and the
Preferred Warrant was converted into a warrant to purchase an equal number of
shares of Common Stock. Such warrants and the warrant to purchase 600,000
shares of common stock are exercisable at any time prior to the earlier of
October 1, 2004 or the consummation of an initial public offering of the
Company's common stock.

  On November 18, 1997, the Company issued a warrant to purchase up to
1,900,000 shares of Common Stock, with an exercise price of $2.63 per share to
a customer to whom the Company provides consulting services (see Note 1). The
fair value of the warrant was determined to be de minimis on the date of
grant. The warrant was not exercised, and, on April 6, 1998, was cancelled.

                                     F-15
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


9. Capital Stock (continued)

 Series B Mandatorily Redeemable Convertible Preferred Stock

  On April 27, 1998, the Company issued 5,865,104 shares of Series B
Mandatorily Redeemable Convertible Preferred Stock ("Series B Stock") to
various investors at a purchase price of $1.705 per share, resulting in net
proceeds of $9,852,000. In this private placement, 439,883 shares were sold to
two officers of the Company and 668,622 shares were sold to the holders of the
Series A Stock and the Preferred Warrant.

  Each share of Series B Stock has a liquidation value of $1.705 per share and
is convertible into one share of Common Stock, subject to anti-dilution
provisions, as defined. The Series B Stock will automatically convert into
Common Stock on the consummation of an initial public offering of the
Company's Common Stock with gross proceeds of at least $30 million and at a
price per share of at least $11.61 (as adjusted). To the extent not previously
converted to Common Stock, on March 31, 2005 a stockholder may request the
Company to redeem any or all shares of Series B Stock held, at its liquidation
value, subject to the rights of the Series C Stock.

  The holders of the Series B Stock vote together with all other classes of
stock on all actions taken by the stockholders of the Company, and together
with the Series C Stock, have the right to elect two directors to the
Company's Board of Directors.

  In connection with the Series B Stock private placement, the two officers of
the Company who participated in the offering provided the Company with bridge
financing of $750,000 which was converted into Series B Stock. In addition,
the Company issued the two officers warrants to purchase an aggregate of
439,883 shares of Common Stock with an exercise price of $1.705 per share. The
warrants are exercisable at any time prior to April 30, 2008. The fair value
of these warrants was determined to be de minimis at the date of the grant.

 Series C Mandatorily Redeemable Convertible Preferred Stock

  On February 24, 1999, the Company issued 3,229,975 shares of Series C
Mandatorily Redeemable Convertible Preferred Stock (the "Series C Stock") to
various investors at a purchase price of $4.644 per share, resulting in net
proceeds of $14,932,000. The Series C Stock has a liquidation preference value
of $22,500,000 and has conversion and redemption features identical to the
Series B Stock, except that redemption may be requested commencing December
31, 2004. The holders of the Series C Stock vote together with all other
classes of stock on all actions taken by the stockholders of the Company, and,
together with the holders of the Series B Stock, have the right to elect two
directors to the Company's Board of Directors.

                                     F-16
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


9. Capital Stock (continued)

  Also, on February 24, 1999 the Board of Directors increased the total
authorized preferred stock from 10,000,000 shares to 15,000,000 shares.

 Registration Rights

  Certain of the common and preferred stockholders have registration rights
under an agreement which, as amended on February 24, 1999, provides for the
registration of Common Stock held by such stockholders, on or after one year
from the completion of an initial public offering of the Company's Common
Stock.

 Put Rights

  In connection with the Series B and Series C Stock offerings, each of the
common and preferred stockholders were granted the right to require the
Company to repurchase all of their outstanding stock, in the event of a change
of control of the Company, as defined. The repurchase price per share is the
greater of (i) the price obtained by the Company in its most recent sale of
equity securities, (ii) the weighted average price paid by the new controlling
investor, or (iii) the fair value of the securities being repurchased.

 Common Shares Reserved

  As of December 31, 1998, the Company had reserved shares of Common Stock for
issuance as follows:

<TABLE>
<CAPTION>
                                                                       Number of
                                                                        Shares
                                                                       ---------
      <S>                                                              <C>
      Exercise of common stock options................................ 2,200,000
      Exercise of common stock warrants............................... 1,161,883
      Conversion of Series B Stock.................................... 5,865,104
</TABLE>

 Stock Option Plan

  On February 17, 1998, the Company adopted the 1998 Stock Incentive Plan (the
"Plan"). The Plan, as amended, provides for the granting of awards to purchase
up to 3,350,000 shares of common stock. The Plan provides for award grants in
the form of incentive stock options, non-qualified stock options, stock
appreciation rights, restricted stock, performance units and performance
shares.

  Under the terms of the Plan, a committee of the Company's Board of Directors
may grant options to purchase shares of the Company's Common Stock to
employees, directors and consultants of the Company at such prices as may be
determined by the committee, principally

                                     F-17
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


9. Capital Stock (continued)

equal to or greater than fair value at the date of grant. Options granted
under the Plan generally vest over three years and expire after ten years.

  The Company's stock option activity is as follows:

<TABLE>
<CAPTION>
                                1997               1998
                          ----------------- --------------------
                                  Weighted-            Weighted-
                          Number   Average   Number     Average
                            of    Exercise     of      Exercise
                          Shares    Price    Shares      Price
                          ------- --------- ---------  ---------
<S>                       <C>     <C>       <C>        <C>
Options outstanding,
 beginning of year......      --      --      799,170    $0.11
Options granted.........  799,170   $0.11     758,955     0.70
Options cancelled.......      --      --     (237,500)    (.29)
                          -------   -----   ---------    -----
Options outstanding, end
 of year................  799,170   $0.11   1,320,625    $0.42
                          =======   =====   =========    =====
</TABLE>

  The weighted-average fair value of options granted in 1997 and 1998 was $.03
and $.16, respectively.

  The following table summarizes information about fixed price stock options
outstanding at December 31, 1998:

<TABLE>
<CAPTION>
                             Outstanding               Exercisable
                      -------------------------- ------------------------
                         Weighted-     Weighted-     Number     Weighted-
 Range of    Number       Average       Average  Exercisable at  Average
 Exercise      of        Remaining     Exercise   December 31,  Exercise
  Prices     Shares   Contractual Life   Price        1998        Price
 ---------  --------- ---------------- --------- -------------- ---------
 <S>        <C>       <C>              <C>       <C>            <C>
 $.01-$.16    575,000    8.7 years       $ .06      191,667       $.06
  .52-.60     441,000    9.1 years         .59       18,333        .52
    .85       304,625    9.2 years         .85          --         --
            ---------                               -------
 $.01-$.85  1,320,625                    $ .42      210,000       $.10
 =========  =========                    =====      =======       ====
</TABLE>


  Had the Company been accounting for its employee stock options under the
fair value method of SFAS No. 123, there would not have been a material impact
on the Company's net loss or basic and diluted net loss per share available to
common stockholders during 1998 or 1997.

  During the three month period ended March 31, 1999 the Company granted
options to employees to purchase an aggregate of 1,047,875 shares of common
stock at exercise prices ranging from $1.25 to $2.32. The exercise price of
each of these option grants was below the fair value of the Company's common
stock at the respective dates of grant, resulting in non-cash compensation of
approximately $2.3 million which will be amortized to expense over the options
vesting periods, generally three to seven years.


                                     F-18
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

10. Earnings (Loss) Per Share

  The Company computes net loss per share under the provisions of SFAS No.
128, "Earnings per Share" (SFAS 128), and SEC Staff Accounting Bulletin No. 98
(SAB 98).

  Under the provisions of SFAS 128 and SAB 98, basic and diluted net loss per
share is computed by dividing the net loss available to common stockholders
for the period by the weighted average number of shares of Common Stock
outstanding during the period. The calculation of diluted net loss per share
excludes potential common shares if the effect is antidilutive. Basic earnings
per share is computed by dividing income or loss applicable to common
stockholders by the weighted average number of shares of Common Stock
outstanding during this period.

  Diluted earnings per share is determined in the same manner as basic
earnings per share except that the number of shares is increased assuming
exercise of dilutive stock options and warrants using the treasury stock
method and assuming conversion of the Company's Preferred Stock. In addition,
income or loss is adjusted for dividends and other transactions relating to
preferred shares for which conversion is assumed. The diluted earnings per
share amount equals basic earnings per share because the Company had a net
loss and the impact of the assumed exercise of the stock options and warrants
and the assumed preferred stock conversion is not dilutive.

11. Geographic Data

  During the three months ended March 31, 1999, the Company generated
approximately 5% of its revenue from customers domiciled in countries other
than the United States, primarily in Asia. For the period from inception to
December 31, 1997 and the year ended December 31, 1998, substantially all of
the Company's revenue was derived from domestic operations.

12. Unaudited Pro Forma Information

  The Company is planning to file a registration statement with the Securities
and Exchange Commission that would permit the Company to sell shares of common
stock in an initial public offering (IPO). Under the Company's Certificate of
Incorporation, all outstanding Series B and Series C Stock will convert into
Common Stock on a one-for-one basis as adjusted for any stock splits, upon the
closing of the Company's IPO of Common Stock.

  The unaudited pro forma balance sheet information and the pro forma net loss
per share reflect the effects of the automatic conversion of all series of the
Company's mandatorily redeemable convertible preferred stock to common stock
upon the closing of the IPO, and the exercise of certain warrants to purchase
722,000 shares of common stock at $.001 per share.


                                     F-19
<PAGE>

                          ITXC CORP. AND SUBSIDIARIES

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


12. Unaudited Pro Forma Information (continued)

  The unaudited pro forma information gives effect to a conversion price of
$1.705 for Series B Stock and $4.644 for Series C Stock. The actual conversion
price may be different upon actual conversion as a result of anti-dilution
provisions.

  The unaudited pro forma net loss per share assumes the conversion of the
Series B and Series C Stock to Common Stock as if it had been converted at the
date of issuance and the exercise of warrants to purchase 722,000 shares of
Common Stock, as if they had been exercised on the date of issuance, even
though the result is antidilutive.

  The following table presents the calculation of basic and diluted net loss
per share and pro forma net loss per share.

<TABLE>
<CAPTION>
                                December 31, 1998            March 31, 1999 (Unaudited)
                          -------------------------------  -------------------------------
                                       Denominator                      Denominator
                                        (Weighted                        (Weighted
                           Numerator     Average    Per     Numerator     Average    Per
                          (Net Loss)     Shares)   Share   (Net Loss)     Shares)   Share
                          -----------  ----------- ------  -----------  ----------- ------
<S>                       <C>          <C>         <C>     <C>          <C>         <C>
Basic and diluted net
 loss per common share..  $(7,290,324)  4,092,278  $(1.78) $(3,056,991)  4,190,500  $(0.73)
Accretion of redemption
 value of mandatorily
 redeemable convertible
 preferred stock........       14,217         --      --       113,446         --      --
Assumed conversion of
 shares of mandatorily
 redeemable convertible
 preferred stock into
 shares of common stock
 at issuance............          --    3,985,057     --           --    7,121,205     --
Assumed exercise of
 warrants for shares of
 common stock at
 issuance...............          --      722,000     --           --      722,000     --
                          -----------   ---------  ------  -----------  ----------  ------
Pro forma basic and
 diluted net loss per
 common share...........  $(7,276,107)  8,799,335  $(0.83) $(2,943,545) 12,033,705  $(0.24)
                          ===========   =========  ======  ===========  ==========  ======
</TABLE>

                                     F-20
<PAGE>

[Inside back cover: A graphic depicting ITXC logo surrounded by portions of
global map and people talking on telephones.]

<PAGE>


                                       Shares

                                     [Logo]

                                   ITXC Corp.

                                  Common Stock

                     -------------------------------------
                                   PROSPECTUS
                                       , 1999

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


                                Lehman Brothers

                               CIBC World Markets

                     First Analysis Securities Corporation

<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 we are not soliciting offers to buy these +
+securities in any state or jurisdiction where the offer or sale is not        +
+permitted.                                                                    +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                Subject to Completion, dated July 15, 1999

PROSPECTUS
                                       Shares

                                     [Logo]

                                   ITXC Corp.
                                  Common Stock

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

  This is our initial public offering of shares of common stock. We are
offering      shares. Of the      shares being offered, we are offering
shares outside the United States and Canada and      shares in the United
States and Canada.

  We expect the public offering price to be between $    and $    per share. No
public market currently exists for our shares.

  We have applied to list the shares on the Nasdaq National Market under the
symbol "ITXC".

     Investing in the shares involves risks. Risk Factors begin on page 5.

<TABLE>
<CAPTION>
                                                                Per Share Total
                                                                --------- -----
<S>                                                             <C>       <C>
Public offering price.........................................     $       $
Underwriting discount.........................................     $       $
Proceeds to ITXC..............................................     $       $
</TABLE>

  We have granted the international underwriters a 30-day option to purchase up
to     additional shares of common stock and the U.S. underwriters a 30-day
option to purchase up to      additional shares of common stock, in each case
on the same terms and conditions as set forth above solely to cover over-
allotments, if any.

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if
this prospectus is accurate or complete. Any representation to the contrary is
a criminal offense.

  Lehman Brothers, on behalf of the underwriters, expects to deliver the shares
on or about        , 1999.

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

Lehman Brothers
          CIBC World Markets
                                           First Analysis Securities Corporation

      , 1999
<PAGE>

                                    PART II

                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

Item 13. Other Expenses of Issuance and Distribution

   The following table sets forth estimated expenses expected to be incurred in
connection with the issuance and distribution of the securities being
registered:

<TABLE>
<CAPTION>
      Item                                                              Amount
      ----                                                              -------
      <S>                                                               <C>
      SEC registration fee............................................. $23,978
      NASD filing fee..................................................   9,125
      Nasdaq listing fee...............................................  95,000
      Printing and engraving expenses..................................       *
      Legal fees and expenses..........................................       *
      Accounting fees and expenses.....................................       *
      Transfer agent and registrar fees................................       *
      Miscellaneous....................................................       *
                                                                        -------
          Total........................................................ $     *
                                                                        =======
</TABLE>

Item 14. Indemnification of Directors and Officers

   Under Section 145 of the Delaware General Corporation Law (DGCL), a
corporation has the power to indemnify directors and officers under certain
prescribed circumstances and subject to certain limitations against certain
costs and expenses, including attorneys' fees actually and reasonably incurred
in connection with any action, suit or proceeding, whether civil, criminal,
administrative or investigative, to which any of them is a party by reason of
his being a director or officer of the corporation if it is determined that he
acted in good faith and in a manner he believed to be in (or not opposed to)
the interests of the corporation, and, in the case of a criminal proceeding, he
had no reason to believe his conduct was unlawful. Our certificate of
incorporation provides that we will indemnify any person who was or is a party
or is threatened to be made a party to any threatened, pending or completed
action, suit or proceeding by reason of the fact that he is or was a director
or officer of ITXC, or is or was serving at our request as a director, officer,
employee, manager or agent of another entity, against certain liabilities,
costs and expenses. It further permits us to maintain insurance on behalf of
any person who is or was a director, officer, employee or agent of ITXC, or is
or was serving at our request as a director, officer, employee or agent of
another entity against any liability asserted against such person and incurred
by such person in any such capacity or arising out of his status as such,
whether or not we would have the power to indemnify such person against such
liability under the DGCL.

   Section 102(b)(7) of the DGCL permits a corporation, in its certificate of
incorporation, to limit or eliminate, subject to certain statutory limitations,
the personal liability of directors to the corporation or its stockholders for
monetary damages for breaches of fiduciary duty, as a director except for
liability (a) for any breach of the director's duty of loyalty to the
corporation or its stockholders, (b) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (c) under
Section 174 of the DGCL, or (d) for any transaction from which the director
derived an improper personal benefit.

                                      II-1
<PAGE>

Article TENTH of our Certificate of Incorporation contains the following
provision regarding limitation of liability of our directors and officers:

  "No director of the Corporation shall be liable to the Corporation or its
  stockholders for monetary damages for breach of fiduciary duty as a
  director, except for liability (i) for any breach of the director's duty of
  loyalty to the Corporation or its stockholders, (ii) for acts or omissions
  not in good faith or which involve intentional misconduct or a knowing
  violation of law, (iii) under Section 174 of the General Corporation Law of
  the State of Delaware, or (iv) for any transaction from which the director
  derived an improper personal benefit."

   The underwriting agreement contains provisions pursuant to which each
underwriter severally agrees to indemnify us, any person controlling us within
the meaning of Section 15 of the Securities Act of 1933, or Section 20 of the
Securities Exchange Act of 1934, each of our directors, and each officer of
ITXC who signs this registration statement with respect to information relating
to such underwriter furnished in writing to us by or on behalf of such
underwriter specifically for inclusion in this registration statement.

Item 15. Recent Sales of Unregistered Securities

   Since ITXC was incorporated in July 1997, ITXC sold shares of its capital
stock in the following transactions, each of which was intended to be exempt
from the registration requirements of the Securities Act of 1933:

   On July 21, 1997, ITXC sold to its Chief Executive Officer, Tom Evslin,
3,000,000 shares of common stock, for an aggregate purchase price of $30,000.
For the foregoing transaction, ITXC relied upon the exemption from registration
under Section 4(2) of the Securities Act; such shares continue to bear a
restrictive legend.

   On October 1, 1997, ITXC sold to one accredited investor 900,000 shares of
common stock, for an aggregate cash purchase price of $900 and the contribution
by the investor of certain property. On October 1, 1997, ITXC sold to that same
investor 278,000 shares of Series A convertible preferred stock, warrants
covering 122,000 shares of such Series A convertible preferred stock (which
have been converted into warrants to purchase 122,000 shares of common stock)
and warrants covering 600,000 shares of common stock (exercisable subject, in
part, to ITXC's utilization of software credits) in exchange for $500,000 in
cash, and $1.0 million of software credits to purchase VocalTec equipment. Such
shares of Series A convertible preferred stock have been converted into common
stock. For the foregoing transactions, ITXC relied upon the exemption from
registration under Section 4(2) of the Securities Act; such shares continue to
be subject to a restrictive legend.

   On April 27, 1998, ITXC sold an aggregate of 5,865,104 shares of its Series
B Convertible Preferred Stock for an aggregate cash consideration of $10.0
million to a total of fourteen accredited investors. For the foregoing
transaction, ITXC relied upon the exemption from registration under Regulation
D under the Securities Act. Each of these shares continues to be subject to
restrictive legends.


                                      II-2
<PAGE>

   On September 23, 1998, ITXC issued 12,500 shares of common stock to Howard
Fischer Associates, Inc. for consideration consisting of certain services
provided to ITXC. For the foregoing transaction, ITXC relied upon the exemption
from registration under Section 4(2) of the Securities Act. Such shares
continue to bear a restrictive legend.

   On February 24, 1999, ITXC sold an aggregate of 3,229,975 shares of its
Series C Convertible Preferred Stock for aggregate cash consideration of $15.0
million to a total of fourteen accredited investors. For the foregoing
transaction, ITXC relied upon the exemption from registration under Regulation
D under the Securities Act. Further, each of these shares continues to be
subject to restrictive legends.

   On April 27, 1998, ITXC entered into certain warrant agreements with Mr.
Evslin and Mr. Jordan. Their warrants are fully vested and currently
exercisable and entitle the holder to purchase 322,581 shares of common stock
and 117,302 shares of common stock, respectively. For the foregoing
transaction, ITXC relied upon the exemption from registration under Section
4(2) of the Securities Act.

   From inception through June 10, 1999, ITXC granted to certain of its
officers, directors and employees options to purchase up to an aggregate of
2,805,875 shares of common stock. Options to purchase 229,003 of such shares
were exercised. For the foregoing transactions, ITXC relied upon the exemption
from registration contained in Sections 3(b) and 4(2) of the Securities Act and
Rule 701 promulgated thereunder relative to sales pursuant to certain
compensatory benefits plans.

   On June 11, 1999, VocalTec Communications exercised all of the warrants
previously granted to it by ITXC. As a result, ITXC issued 722,000 shares of
its common stock upon payment to it of $722. For the foregoing transaction,
ITXC relied upon the exemption from registration under Section 4(2) of the
Securities Act; such shares continue to be subject to a restrictive legend.

                                      II-3
<PAGE>

Item 16. Exhibits and Financial Statement Schedules

   (a) Exhibits.

<TABLE>
<CAPTION>
  No.  Description
 ----- -----------
 <C>   <S>
  1.1  Form of Underwriting Agreement**
  3.1  Second Restated Certificate of Incorporation*
  3.2  Form of Third Restated Certificate of Incorporation to be filed upon
       consummation of the offerings**
  3.3  By-laws, as amended*
  3.4  Form of Amended and Restated By-laws to be in effect upon the
       consummation of the offerings**
  4.1  Third Amended and Restated Registration Rights Agreement, dated February
       24, 1999*
  4.2  Form of certificate representing shares of common stock
  5.1  Opinion of Lowenstein Sandler PC**
 10.1  Second Amended and Restated Employment Agreement between the Registrant
       and Tom Evslin**
 10.2  Employment Agreement between the Registrant and John G. Musci*
 10.3  1998 Stock Incentive Plan, as amended*
 10.4  Employee Cash Incentive Plan*
 10.5  Employee Stock Purchase Plan**
 10.6  Joint Venture and Quotaholders Agreement, dated as of July 19, 1998, by
       and between TeleNova Comunicacoes Ltda. and ITXC Corp.*
 10.7  First Amendment to Joint Venture and Quotaholders' Agreement, dated
       August 18, 1998, by and between TeleNova Comunicacoes Ltda. and ITXC
       Corp.*
 10.8  Memorandum and Amendment to Joint Venture and Quotaholders' Agreement,
       dated as of May 31, 1999, by and among ITXC Corp., TeleNova Comunicacoes
       Ltda. and Telesisa Sistemas emTelecomunicacoes S.A.*
 10.9  Lease Agreement, dated February 2, 1998 by and between the Registrant
       and Peregrine Investment Partners--I*
 10.10 First Amendment to Lease dated April 16, 1999, by and between the
       Registrant and Peregrine Investment Partners--I*
 21.1  Subsidiaries of the Registrant*
 23.1  Consent of Ernst &Young LLP
 23.2  Consent of Lowenstein Sandler PC (to be included in Exhibit 5.1)
 24.1  Powers of Attorney*
 27.1  Financial Data Schedule*
</TABLE>
- --------

*Previously filed.

**To be filed by amendment.

   (b) Financial Statement Schedules: Not applicable

Item 17. Undertakings

   The undersigned registrant hereby undertakes to provide to the underwriters
at the closing of the offerings described in the Underwriting Agreement,
certificates in such denominations and registered in such names as requested by
the underwriter to permit prompt delivery to each purchaser.

   Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Securities Act") 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 and is, therefore, unenforceable. In

                                      II-4
<PAGE>

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 and will be governed by the final adjudication
of such issues.

   The undersigned Registrant hereby undertakes that:

  (1)  For purposes of determining any liability under the Securities Act,
      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 497(h) under the Securities Act 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,
      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-5
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment No. 1 to its Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in the City of
Princeton, State of New Jersey, on July 15, 1999.

                                          ITXC Corp.

                                                    /s/ Edward B. Jordan
                                          By: _________________________________
                                                      Edward B. Jordan
                                                  Executive Vice President

   Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to the Registrant's Registration Statement has been signed by the
following persons in the capacities indicated on this 15 day of July, 1999.

<TABLE>
<CAPTION>
              Signature                                       Title
              ---------                                       -----
<S>                                                 <C>
          /s/ Tom I. Evslin*                        Chairman, President and
______________________________________               Chief Executive Officer
            Tom I. Evslin
          /s/ John G. Musci*                        Director
______________________________________
            John G. Musci

         /s/ Edward B. Jordan                       Chief Financial and
______________________________________               Accounting Officer and
           Edward B. Jordan                          Director

       /s/ William P. Collatos*                     Director
______________________________________
         William P. Collatos

          /s/ Elon A. Ganor*                        Director
______________________________________
            Elon A. Ganor

       /s/ Frederick R. Wilson*                     Director
______________________________________
         Frederick R. Wilson
</TABLE>

        /s/ Edward B. Jordan
*By: ____________________________
        Edward B. Jordan
        Attorney-in-Fact

                                      II-6
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
  No.  Description
 ----- -----------
 <C>   <S>
  1.1  Form of Underwriting Agreement**
  3.1  Second Restated Certificate of Incorporation*
  3.2  Form of Third Restated Certificate of Incorporation to be filed upon
       consummation of the offerings**
  3.3  By-laws, as amended*
  3.4  Form of Amended and Restated By-laws to be in effect upon the
       consummation of the offerings**
  4.1  Third Amended and Restated Registration Rights Agreement, dated February
       24, 1999*
  4.2  Form of certificate representing shares of common stock
  5.1  Opinion of Lowenstein Sandler PC**
 10.1  Second Amended and Restated Employment Agreement between the Registrant
       and Tom Evslin**
 10.2  Employment Agreement between the Registrant and John G. Musci*
 10.3  1998 Stock Incentive Plan, as amended*
 10.4  Employee Cash Incentive Plan*
 10.5  Employee Stock Purchase Plan**
 10.6  Joint Venture and Quotaholders Agreement, dated as of July 19, 1998, by
       and between TeleNova Comunicacoes Ltda. and ITXC Corp.*
 10.7  First Amendment to Joint Venture and Quotaholders' Agreement, dated
       August 18, 1998, by and between TeleNova Comunicacoes Ltda. and ITXC
       Corp.*
 10.8  Memorandum and Amendment to Joint Venture and Quotaholders' Agreement,
       dated as of May 31, 1999, by and among ITXC Corp., TeleNova Comunicacoes
       Ltda. and Telesisa Sistemas emTelecomunicacoes S.A.*
 10.9  Lease Agreement, dated February 2, 1998 by and between the Registrant
       and Peregrine Investment Partners--I*
 10.10 First Amendment to Lease dated April 16, 1999, by and between the
       Registrant and Peregrine Investment Partners--I*
 21.1  Subsidiaries of the Registrant*
 23.1  Consent of Ernst &Young LLP
 23.2  Consent of Lowenstein Sandler PC (to be included in Exhibit 5.1)
 24.1  Powers of Attorney*
 27.1  Financial Data Schedule*
</TABLE>
- --------

* Previously filed.

** To be filed by amendment

   (b) Financial Statement Schedules: Not applicable.


<PAGE>

Exhibit 4.2

   NUMBER                   [LOGO]                              SHARES

                    ITXC CORP.

   INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE


                         CUSIP _________
                SEE REVERSE FOR CERTAIN DEFINITIONS


- --------------------------------------------------
THIS CERTIFIES THAT


is the owner of
- --------------------------------------------------

FULLY-PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK,
$0.001 PAR VALUE, OF ITXC Corp.., transferable on the books of the Corporation
by the holder hereof in person or by duly authorized attorney upon surrender of
this Certificate properly endorsed. This Certificate and the shares represented
hereby are issued and shall be held subject to all the provisions of the
Certificate of Incorporation, as amended, and the By-Laws of the Corporation, as
amended (copies of which are on file at the office of the Transfer Agent), to
all of which the holder of this Certificate by acceptance hereof assents. This
Certificate is not valid unless countersigned and registered by the Transfer
Agent and Registrar.

WITNESS the facsimile seal of the Corporation and the facsimile signatures of
its duly authorized officers.

Dated:


/s/ Edward B. Jordan                          /s/ Tom I. Evslin
- ----------------------  [SEAL OF ITXC Corp.]  ---------------------
 Edward B. Jordan                             Tom I. Evslin
  Vice President                               Chairman, President
  and and Chief Financial                      Chief Executive
  Officer                                      Officer

Countersigned and Registered:
Continental Stock Transfer and Trust Company

Transfer Agent and Registrar

- --------------------
Authorized Signature
<PAGE>

              ITXC Corp.

   The Corporation will furnish to any stockholder, upon request and without
charge, a full statement of the powers, designations, preferences and relative,
participating, optional, or other special rights of each class of stock or
series thereof and the qualifications, limitations or restrictions of such
preferences and/or rights.

   The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM - as tenants in common            UNIF GIFT MIN ACT-      Custodian
                                                 ------   -----
TEN ENT - as tenants by the entireties           (Cust)   (Minor)
JT TEN  - as joint tenants with right
    of survivorship and not as            under Uniform Gifts to
    tenants in common                     Minors Act
                                          -----------
                                          (State)


 Additional abbreviations may also be used though not in the above list.


For value received,                      hereby sell, assign and transfer unto

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

PLEASE INSERT SOCIAL SECURITY OR OTHER
 IDENTIFYING NUMBER OF ASSIGNEE
[                                    ]
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Please print or typewrite name and address including postal zip code of assignee

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

- --------------------------------------------------------------------------------
                                  Shares
- ----------------------------------------------------------------------
of the Common Stock represented by the within Certificate, and do hereby
irrevocable constitute and appoint
                                  ----------------------------------------------

- --------------------------------------------------------------------------------
Attorney to transfer the said stock on the books of the within-named Corporation
with full power of substitution in the premises.

Dated
     ------------------------------

                                ------------------------------------------------
                                                     SIGNATURE

                                      -2-
<PAGE>

    Signature Guaranteed By:

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

- -----------------------------------------
   Banker or Member Firm of
     a Stock Exchange



Signature(s) Guaranteed:


- -------------------------------------------------------------------------------
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEM-
BERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO
S.E.C. RULE 17AD-15.


NOTICE: The signature to this assignment must correspond with the name as
written upon the face of the Certificate, in every particular, without
alteration or enlargement, or any change whatever.


                                      -3-

<PAGE>

                                                                    Exhibit 23.1

                        Consent of Independent Auditors


We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated February 3, 1999 (except for paragraphs 9 to 12 of Note
9, as to which the date is February 24, 1999), in Amendment No. 1 to the
Registration Statement (Form S-1 No. 333-80411) and related Prospectus of ITXC
Corp. dated July 15, 1999.



                                              /s/ Ernst & Young LLP


Metropark, New Jersey
July 14, 1999


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