IBASIS INC
10-Q, 2000-05-15
BUSINESS SERVICES, NEC
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q
- --------------------------------------------------------------------------------


(Mark One)
[X]    Quarterly Report Pursuant to Section 13 or 15(d) of the Securities
       Exchange Act of 1934

                  For the Quarterly Period Ended MARCH 31, 2000

                                       or

[   ]  Transition Report Pursuant to Section 13 or 15(d) of the Securities
       Exchange Act of 1934

             For the Transition Period from __________ to __________


                        COMMISSION FILE NUMBER 000-27127


                                  IBASIS, INC.
             (Exact Name of Registrant as Specified in its Charter)


             DELAWARE                                    04-3332534
(State or Other Jurisdiction of             (I.R.S. Employer Identification No.)
 Incorporation or Organization)


                     20 SECOND AVENUE, BURLINGTON, MA 01803
          (Address of Principal Executive Offices, Including Zip Code)


                                 (781) 505-7500
              (Registrant's Telephone Number, Including Area Code)


Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

YES _X_  NO ___

As of May 8, 2000, there were 33,926,438 shares of the Registrant's Common
Stock, par value $0.001 per share, outstanding.

<PAGE>


                                  IBASIS, INC.
                                      Index

<TABLE>
<CAPTION>

                                                                                                                   PAGE
<S>                                                                                                                <C>

PART I - FINANCIAL INFORMATION

Item 1 - Financial Statements

          Condensed Consolidated Balance Sheets at March 31, 2000 and
             December 31, 1999 (Unaudited)                                                                           2

          Condensed Consolidated Statements of Operations for the Three Months Ended
             March 31, 2000 and 1999 (Unaudited)                                                                     3

          Condensed Consolidated Statements of Cash Flows for the Three Months Ended
             March 31, 2000 and 1999 (Unaudited)                                                                     4

          Notes to Condensed Consolidated Financial Statements (Unaudited)                                           5

Item 2 - Management's Discussion and Analysis of Financial Condition and Results of
             Operations                                                                                             6-9

Item 3 - Quantitative and Qualitative Disclosures About Market Risk                                                 10


PART II - OTHER INFORMATION

Item 6 - Exhibits                                                                                                   11

         Signature                                                                                                  12




                                       1
<PAGE>




                                  IBASIS, INC.
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                                   (Unaudited)

                                                                                     MARCH 31,                 DECEMBER 31,
                                                                                        2000                       1999
                                                                                        ----                       ----
                                     ASSETS

Current assets:
   Cash and cash equivalents                                                        $352,828,447               $123,665,961
   Marketable securities                                                              39,000,000                         --
   Accounts receivable, net of allowance for doubtful accounts of
   approximately $1,177,000 and $633,000, respectively                                 6,264,142                  5,404,338
   Prepaid expenses and other current assets                                           1,769,593                    964,675
                                                                                   -------------               ------------
           Total current assets                                                      399,862,182                130,034,974

Property and equipment, at cost:
   Construction in process                                                             6,639,553                         --
   Network equipment                                                                   6,858,170                  6,544,913
   Equipment under capital lease                                                      21,758,521                 16,430,153
   Leasehold improvements                                                              1,904,640                  1,696,755
   Computer software                                                                   1,886,541                    782,244
   Furniture and fixtures                                                                244,146                    154,970
                                                                                   -------------               ------------
                                                                                      39,291,571                 25,609,035
   Less- Accumulated depreciation and amortization                                    (5,138,017)                (3,218,920)
                                                                                   -------------               ------------
                                                                                      34,153,554                 22,390,115
Deferred financing costs, net of accumulated amortization of
   approximately $43,000 and $0, respectively                                          4,973,254                         --
Other assets                                                                           1,031,224                  1,048,000
                                                                                   -------------               ------------
                                                                                    $440,020,214               $153,473,089
                                                                                    ============               ============


                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                                                                  $ 6,240,654                $ 6,112,938
   Accrued expenses                                                                    6,022,385                  4,391,296
   Current portion of long term debt                                                   6,622,890                  4,376,280
                                                                                    ------------                -----------
           Total current liabilities                                                  18,885,929                 14,880,514

Long term debt, net of current portion                                               164,156,283                 11,688,843

Stockholders' equity:
   Common stock, $.001 par value, authorized- 85,000,000 shares, issued
    and outstanding- 33,832,376 and 31,642,728, respectively                              33,832                     31,642
   Additional paid-in capital                                                        297,466,653                156,887,447
   Deferred compensation                                                              (2,051,526)
                                                                                                                 (2,200,547)
   Accumulated deficit                                                               (38,470,957)               (27,814,810)
                                                                                    ------------                ------------
           Total stockholders' equity                                                256,978,002                126,903,732
                                                                                    ------------                ------------
                                                                                    $440,020,214               $153,473,089
                                                                                    ============                ============


</TABLE>


          THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONDENSED
                      CONSOLIDATED FINANCIAL STATEMENTS.

                                       2
<PAGE>


                                  IBASIS, INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)
<TABLE>
<CAPTION>

                                                                                      THREE MONTHS ENDED MARCH 31,
                                                                                     2000                           1999
                                                                                     ----                           ----
<S>                                                                             <C>                            <C>


Net revenue                                                                        $9,725,492                    $2,413,983
Operating expenses:
   Data communications and telecommunications                                      10,080,503                     2,586,302
   Research and development                                                         2,819,009                       864,784
   Selling and marketing                                                            3,288,280                       837,253
   General and administrative                                                       3,809,602                       611,313
   Depreciation and amortization                                                    1,926,272                       233,313
                                                                                -------------                   -----------
Total operating expenses                                                           21,923,666                     5,132,965
                                                                                -------------                   -----------
Loss from operations                                                              (12,198,174)                   (2,718,982)
Interest income                                                                     2,451,292                        54,246
Interest expense                                                                    (909,265)                      (60,252)
Other income (expense), net                                                                --                       (2,037)
Minority interest in loss of joint venture                                                 --                        49,000
                                                                                -------------                   -----------
   Net loss                                                                      (10,656,147)                   (2,678,025)
Accretion of dividends on redeemable convertible
   preferred stock                                                                        --                      (157,501)
                                                                                -------------                  ------------
   Net loss applicable to common stockholders                                   $(10,656,147)                  $(2,835,526)
                                                                                =============                  ============

Net loss per share:
   Basic and diluted net loss per share                                            $   (0.33)                    $   (0.38)
                                                                                =============                  ============
   Basic and diluted weighted average common shares    outstanding
                                                                                   32,205,878                     7,526,250
                                                                                =============                  ============

Pro forma net loss per share:
   Basic and diluted net loss per share                                            $   (0.33)                    $   (0.15)
                                                                                =============                  ============
   Basic and diluted weighted average common shares   outstanding
                                                                                   32,205,878                    17,838,750
                                                                                =============                  ============




</TABLE>



          THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONDENSED
                      CONSOLIDATED FINANCIAL STATEMENTS.

                                       3
<PAGE>


                                   IBASIS, INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)
<TABLE>
<CAPTION>

                                                                                           THREE MONTHS ENDED MARCH 31,
                                                                                      2000                            1999
                                                                                      ----                            ----
<S>                                                                              <C>                           <C>

Cash flows from operating activities:
    Net loss                                                                      $ (10,656,147)                 $ (2,678,025)
    Adjustments to reconcile net loss to net cash used in
       operating activities
       Depreciation and amortization                                                   1,926,272                       233,313
       Amortization of deferred financing costs                                           43,271                            --
       Minority interest                                                                      --                       (49,000)
       Amortization of deferred compensation                                             149,021                            --
       Changes in current assets and liabilities:
          Accounts receivable                                                          (859,804)                      (161,156)
          Prepaid expenses and other current assets                                    (804,918)                         7,968
          Accounts payable                                                              127,716                       (672,599)
          Accrued expenses                                                            1,631,089                        478,881
                                                                                  --------------                  -------------
             Net cash used in operating activities                                   (8,443,500)                    (2,840,618)
                                                                                  --------------                  -------------

Cash flows from investing activities:
    Increase in marketable securities                                               (39,000,000)                            --
    Purchases of property and equipment                                              (8,354,168)                       (81,905)
    Decrease/(increase) in other assets                                                  16,776                       (278,593)
                                                                                  --------------                  -------------
             Net cash used in investing activities                                  (47,337,392)                      (360,498)
                                                                                  --------------                  -------------

Cash flows from financing activities:
    Net proceeds from secondary offering of stock                                   140,493,000                             --
    Net proceeds from issuance of bonds                                             144,983,475                             --
    Proceeds from exercise of stock options                                              88,396                             --
    Payments on capital lease obligations                                              (621,493)                       (63,522)
                                                                                  --------------                  -------------
             Net cash provided by (used in) financing activities                     284,943,378                       (63,522)
                                                                                  --------------                  -------------

Net increase (decrease) in cash and cash equivalents                                 229,162,486                    (3,264,638)

Cash and cash equivalents, beginning of period                                       123,665,961                     7,399,451
                                                                                  --------------                  -------------

Cash and cash equivalents, end of period                                            $352,828,447                    $4,134,813
                                                                                  ==============                  =============

</TABLE>




          THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONDENSED
                      CONSOLIDATED FINANCIAL STATEMENTS.


                                       4
<PAGE>




                                  IBASIS, INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                   (Unaudited)

(1)    General

The interim condensed consolidated financial statements presented herein have
been prepared by iBasis, Inc. ("iBasis" or the "Company") without audit and, in
the opinion of management, reflect all adjustments of a normal recurring nature
necessary for a fair presentation. Interim results are not necessarily
indicative of results for a full year.

The condensed consolidated balance sheet presented as of December 31, 1999, has
been derived from the consolidated financial statements that have been audited
by the Company's independent public accountants. The unaudited condensed
consolidated financial statements have been prepared pursuant to the rules and
regulations of the Securities and Exchange Commission. Certain information and
footnote disclosures normally included in the annual financial statements
prepared in accordance with generally accepted accounting principles have been
omitted pursuant to those rules and regulations, but the Company believes that
the disclosures are adequate to make the information presented not misleading.
The condensed consolidated financial statements and notes included herein should
be read in conjunction with the consolidated financial statements and notes
included in the Company's Annual Report on Form 10-K for the year ended December
31, 1999.

(2)    Long term debt

Long term debt consists of the following:

<TABLE>
<CAPTION>

                                                                               MARCH 31,         DECEMBER 31,
                                                                                 2000                1999
                                                                                 ----                ----
<S>                                                                            <C>                 <C>

              5-3/4% Convertible Subordinated Notes, due 2005                $150,000,000          $        --
              Obligations under capital leases                                 20,779,173           16,065,123
              Revolving Credit Facility                                                --                   --
                                                                             ------------          -----------
                                                                              170,779,173           16,065,123
              Less: current portion                                             6,622,890            4,376,280
                                                                             ------------          -----------

              Long term debt, net of current portion                         $164,156,283          $11,688,843
                                                                             ============          ===========
</TABLE>



(3)    Net Loss Per Share and Pro Forma Net Loss Per Share

In accordance with Statement of Financial Accounting Standards No. 128, basic
net loss per common share is calculated by dividing net loss by the weighted
average number of common shares outstanding. The calculation of diluted net loss
per share is consistent with that of basic net loss per share but gives effect
to all dilutive potential common shares (that is, securities such as options,
warrants or convertible securities) that were outstanding during the period,
unless the effect is antidilutive. For the quarters ended March 31, 2000 and
1999, 2,639,701 and 771,218 potential common shares, respectively, have been
excluded from the calculation of diluted net loss per share, as their effects
are antidilutive.

The calculation for pro forma basic and diluted net loss per share is adjusted
to give effect to the conversion of all shares of preferred stock, Class A
common stock and Class B common stock from the date of original issuance.

                                       5
<PAGE>


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

The following discussion and analysis of the Company's financial condition and
results of operations for the three months ended March 31, 2000 and 1999 should
be read in conjunction with the consolidated financial statements and footnotes
for the three months ended March 31, 2000 included herein, and the year ended
December 31, 1999, included in the Company's Annual Report on Form 10-K.

OVERVIEW

We are a provider of international voice and fax call completion services, and
other value-added services using the Internet. We were incorporated in August
1996 and commenced commercial operations in May 1997. We first recorded revenue
from the sale of equipment in May 1997, and first recorded revenue from the sale
of voice and fax services over our network in January 1998. In July 1999, we
changed our name from "VIP Calling, Inc." to "iBasis, Inc."

In November 1999, we completed our initial public offering and issued 7,820,000
shares of common stock, which resulted in total net proceeds to us of
approximately $114.7 million. In March 2000, we completed a secondary public
offering of our common stock and issued 2,026,637 shares of common stock which
resulted in total net proceeds to us of approximately $140.5 million. Also in
March 2000, we completed an offering of $150.0 million in 5 3/4% convertible
subordinated notes, due in 2005. At any time prior to their maturity, these
notes are convertible into common stock at a conversion price of $86.14 per
share, subject to adjustment upon certain events.


RESULTS OF OPERATIONS

NET REVENUE. Our primary source of revenue is the fees that we receive from
customers for completing calls over our network. This revenue is dependent on
the volume of voice and fax traffic carried over the network, which is measured
in minutes. We charge our customers fees per minute of traffic that are
dependent on the length and destination of the call and recognize this revenue
in the period in which the call is completed. We also derive a limited amount of
revenue from the sale of equipment to our customers. Most of these equipment
sales are financed by us by offsetting termination fees otherwise payable to
local service providers against the equipment purchase price until the full
purchase price has been paid.

Our net revenue increased by $7.3 million to $9.7 million for the three
months ended March 31, 2000, from $2.4 million for the three months ended
March 31, 1999. This increase was primarily driven by an increase in revenue
from voice and fax call completion services to $9.6 million for the three
months ended March 31, 2000, from $2.3 million for the three months ended
March 31, 1999. The increase in voice and fax call completion services net
revenue resulted from an increase in the amount of traffic carried over our
network to 85.2 million minutes for the three months ended March 31, 2000,
from 16.8 million minutes for each of the three months ended March 31, 1999.
Net revenue from the sale of equipment was approximately $100,000 for the
three months ended March 31, 2000 and 1999.

                                       6
<PAGE>


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

DATA COMMUNICATIONS AND TELECOMMUNICATIONS EXPENSES. Data communications and
telecommunications expenses are comprised primarily of termination fees,
purchased minutes, equipment expense and other expenses associated with data
communications and telecommunications. Termination fees are paid to local
service providers to terminate calls received from our network. This traffic is
measured in minutes, and the per minute rates charged for terminating calls are
negotiated with the local service provider and included in our contract with our
local service provider. Should competition cause a decrease in our prices and,
as a result our profit margins, our contracts with our providers typically
provide us with the right to renegotiate the per minute termination fees.
Purchased minutes are fees we pay to other telecommunications carriers for
completing calls over the public circuit-switched network to destinations
outside of our network, and as a back-up to our network when our proprietary
Assured Quality Routing software indicates that either these lines are needed to
maintain the quality of our services or our capacity to a particular destination
has been exceeded. The amount of these fees depends on the volume of voice and
fax traffic carried over the public circuit-switched network, which is also
measured in minutes of traffic. The per minute rate charge for purchased minutes
is negotiated with public circuit-switched network carriers for each destination
served. The primary direct expenses that we incur in selling our equipment are
those incurred to purchase the component parts of our equipment from a variety
of vendors. These expenses are recorded when the equipment is installed and
operational. The expenses vary on the basis of the number of units to be
completed and delivered in a particular period, and will increase as equipment
sales increase. Other data communication and telecommunications expenses include
charges for Internet access at our Internet branch offices, fees for the fiber
optic connections between our Internet branch offices and our customers and/or
suppliers, facilities charges for overseas Internet access and phone lines to
the primary telecommunications carriers in particular countries, and charges for
the limited number of dedicated international private line circuits we use.

Data communications and telecommunications expenses increased by $7.5 million
to $10.1 million for the three months ended March 31, 2000, from $2.6 million
for the three months ended March 31, 1999. The increase in data
communications and telecommunications expense was driven by the increase in
traffic described above, as termination fees increased to $5.7 million for
the three months ended March 31, 2000, from $839,000 for the three months
ended March 31, 1999, and purchased minutes increased to $2.2 million for the
three months ended March 31, 2000 from $1.1 million for the three months
ended March 31, 1999. Equipment expenses directly related to equipment sales
increased to $100,000 for the three months ended March 31, 2000, from $93,000
for the three months ended March 31, 1999. Other data communications and
telecommunications expenses, including internet access, public
circuit-switched network access, and international private line charges,
increased to $2.1 million for the three months ended March 31, 2000, from
$568,000 for the three months ended March 31, 1999. As a percentage of total
revenue, data communications and telecommunications expenses decreased to
104% for the three months ended March 31, 2000, from 107% for the three
months ended March 31, 1999.

RESEARCH AND DEVELOPMENT EXPENSES. Research and development expenses include the
expenses of developing, operating, supporting and expanding our international
and domestic network, expenses associated with improving and operating our
global network operations center, salary, and payroll taxes and benefits paid
for employees directly involved in the development and operation of our global
network operations center and the rest of our network. Also included in this
category are research and development expenses that consist primarily of
expenses incurred in enhancing, developing, updating and supporting our network
and our proprietary software applications.



                                       7
<PAGE>



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

Research and development expenses increased by $1.9 million to $2.8 million
for the three months ended March 31, 2000, from $865,000 for the three months
ended March 31, 1999. This increase in research and development expenses is
due principally to the increase in personnel needed to support our expanding
network. As a percentage of total revenue, research and development expenses
decreased to 29% for the three months ended March 31, 2000, from 36% for the
three months ended March 31, 1999.

SELLING AND MARKETING EXPENSES. Selling and marketing expenses include
expenses relating to the salaries, payroll taxes, benefits and commissions
that we pay for sales personnel and the expenses associated with the
development and implementation of our promotion and marketing campaigns,
including expenses relating to our outside public relations firm and industry
analysts. Selling and marketing expenses increased by $2.5 million to $3.3
million for the three months ended March 31, 2000, from $837,000 for the
three months ended March 31, 1999. This increase is attributable to an
increase in the number of personnel and increased marketing expenses,
particularly in connection with public relations campaigns. As a percentage
of total revenue, selling and marketing expenses decreased to 34% for the
year ended March 31, 2000, from 35% for the three months ended March 31, 1999.

GENERAL AND ADMINISTRATIVE EXPENSES. General and administrative expenses
include salary, payroll tax and benefit expenses and related costs for
general corporate functions, including executive management, administration,
facilities, information technology and human resources. General and
administrative expenses increased by $3.2 million to $3.8 million for the
three months ended March 31, 2000, from $611,000 for the three months ended
March 31, 1999. General and administrative expenses increased primarily due
to an increase in the number of personnel, an increase in consulting and
professional fees, and an increase in our allowance for doubtful accounts. As
a percentage of total revenue, general and administrative expenses increased
to 39% for the three months ended March 31, 2000, from 25% for the three
months ended March 31, 1999.

DEPRECIATION AND AMORTIZATION EXPENSES. Depreciation and amortization
expenses increased by $1.7 million to $1.9 million for the three months ended
March 31, 2000, from $233,000 for the three months ended March 31, 1999. This
increase primarily resulted from additional purchases of capital equipment
and software that were needed to support our expanding network. As a
percentage of total revenue, depreciation and amortization expense increased
to 20% for the three months ended March 31, 2000 from 10% for the three
months ended March 31, 1999.

INTEREST INCOME AND INTEREST EXPENSE. Interest expense is primarily comprised of
interest on our 5 3/4% convertible subordinated notes and the various capital
leases pursuant to which we have financed a substantial majority of the hardware
components of our network. Interest income is primarily composed of income
earned on our cash and cash equivalents.

Interest income increased by $2.4 million to $2.5 million for the three
months ended March 31, 2000, from $54,000 for the three months ended March
31, 1999. This increase was primarily attributable to increased interest
earnings on our cash and cash equivalents as a result of our initial public
offering, completed in November 1999, our secondary offering of our common
stock, completed in March 2000, and the issuance of our 5 3/4% subordinated
notes, due in 2005. Interest expense increased by $849,000 to $909,000 for
the three months ended March 31, 2000 from $60,000 for the three months ended
March 31, 1999. This increase was attributable to interest on our 5 3/4%
convertible subordinated notes and capital equipment financing.

                                       8
<PAGE>


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

LIQUIDITY AND CAPITAL RESOURCES

Our principal capital and liquidity needs historically have related to the
development of our network infrastructure, our sales and marketing
activities, research and development expenses, and general capital needs. Our
capital needs have been met, in large part, from the net proceeds from our
initial and secondary public offerings, the issuance of our 5 3/4%
convertible subordinated notes and the sale of our Class B common stock and
preferred stock. As we have placed greater emphasis on expanding our network
infrastructure, we have also sought to meet our capital needs through vendor
capital leases and other equipment financings. We have also established a
line of credit with a bank.

Net cash used in operating activities was $8.4 million for the three months
ended March 31, 2000, as compared to $2.8 million for the three months ended
March 31, 1999. Cash used in operating activities for both periods resulted
from net losses and increases in accounts receivable and other current assets.

Net cash used in investing activities was $47.3 million for the three months
ended March 31, 2000, as compared to $360,000 for the three months ended
March 31, 1999. Cash used in investing activities was primarily related to
our investing in marketable securities during the three months ended March
31, 2000 and the purchases of equipment during the three months ended March
31, 1999 and 2000.

Net cash provided by financing activities was $284.9 million for the three
months ended March 31, 2000, as compared to net cash used in financing
activities of $64,000 for the three months ended March 31, 1999. These
amounts are primarily attributable to the net proceeds from our secondary
public offering of our common stock, the issuance of our 5 3/4% convertible
subordinated notes and the issuance of Class B common stock and preferred
stock.

INITIAL PUBLIC OFFERING. In November 1999, we completed our initial public
offering and issued 7,820,000 shares of common stock, which resulted in total
net proceeds to us of $114.7 million.

SECONDARY PUBLIC OFFERING. In March 2000, we completed our secondary public
offering in which we sold 2,026,637 shares of common stock, which resulted in
total net proceeds to us of $140.5 million. Concurrently, we offered $150.0
million in 5 3/4% convertible subordinated notes due in 2005. The notes are
convertible at any time prior to maturity into common stock at a conversion
price of $86.14 per share, subject to adjustment upon certain events.

REVOLVING LINE OF CREDIT. On June 18, 1999, we entered into a Loan and Security
Agreement with Silicon Valley Bank that provides us with access to a $1.5
million revolving credit facility. The line of credit is secured by a lien on
all of our assets, receivables and after acquired property. Interest accrues
daily on the unpaid principal of the facility at an annual rate equal to the
prime rate, as defined in the Loan and Security Agreement, plus 1%. We must make
interest payments on outstanding borrowings on a monthly basis, otherwise any
unpaid interest is added to the outstanding principal amount, and accrues
interest at the same rate. As of March 31, 2000, we had made no borrowings under
the Loan and Security Agreement. All outstanding amounts under our line of
credit shall become due and payable in full on June 18, 2000.



                                       9
<PAGE>


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


ITEM 3 - QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

To date, we have not engaged in trading market risk sensitive instruments or
purchasing hedging instruments that would be likely to expose us to market risk,
whether interest rate, foreign currency exchange, commodity price or equity
price risk. We have not purchased options or entered into swaps of forward or
futures contracts. Our primary market risk exposure is that of interest rate
risk on borrowings under our credit lines, which are subject to interest rates
based on the banks' prime rate, and a change in the applicable interest rate
that would affect the rate at which we could borrow funds or finance equipment
purchases. While to date our global operations have generated revenues in United
States dollars, we are



                                       10
<PAGE>


currently evaluating the impact of foreign currency exchange risk on our results
of operations as we continue to expand globally.

PART II - OTHER INFORMATION

ITEM 6 - EXHIBITS AND REPORTS ON FORM 8-K

(a)  The following exhibit is filed herewith:

1.1   Underwriting Agreement among iBasis, Inc. and FleetBoston Robertson
      Stephens, Inc., U.S. Bancorp Piper Jaffray, Inc., and Dain Rauscher
      Incorporated to issue and sell an agregate of 3,500,000 shares of
      iBasis, Inc.'s Common Stock, par value $0.001 per share.

1.2   Underwriting Agreement among iBasis, Inc. and FleetBoston Robertson
      Stephens, Inc., U.S. Bancorp Piper Jaffray, Inc., and Dain Rauscher
      Incorporated to issue and sell $150,000,000 aggregate principal amount
      of 5.75% Convertible Subordinated Notes, due 2005.

4.1   Indenture between iBasis, Inc. and The Bank of New York as Trustee.

27.1  Financial Data Schedule

CERTAIN IMPORTANT FACTORS

This quarterly report on Form 10-Q contains forward-looking statements based on
current expectations, estimates and projections about iBasis's industry and
management's beliefs and assumptions. In some cases you can identify these
statements by forward-looking words such as "anticipate," "believe," "could,"
"estimate," "expect," "intend," "may," "should," "will," and "would" or similar
words. You should read statements that contain these words carefully because
they discuss future expectations, contain projections of future results of
operations or of financial position or state other "forward-looking"
information. You should be aware that the occurrence of the events described in
this quarterly report could have an adverse effect on the business, results of
operations and financial position of iBasis.

Any forward-looking statements in this quarterly report are not guarantees of
future performance, and actual results, development and business decisions may
differ from those envisaged by these forward-looking statements, possibly
materially. iBasis disclaims any duty to update any forward-looking statements,
even if new information becomes available or other events occur in the future.



                                       11
<PAGE>


                                  IBASIS, INC.
                                    SIGNATURE



Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.




                                     iBasis, Inc.



MAY 15, 2000                      By: /s/ Michael J. Hughes
   (date)                             ------------------------------
                                      Michael J. Hughes
                                      Vice President and Chief Financial Officer
                                      (Authorized Officer and Principal
                                      Accounting Officer)



                                       12

<PAGE>


                                                                     Exhibit 1.1


                             UNDERWRITING AGREEMENT



                                                         March 9, 2000


FleetBoston Robertson Stephens Inc.
Chase Securities Inc. U.S. Bancorp Piper Jaffray Inc.
Dain Rauscher Incorporated
As Representatives of the several Underwriters
c/o FleetBoston Robertson Stephens Inc.
555 California Street, Suite 2600
San Francisco, CA 94104


Ladies and Gentlemen:

         INTRODUCTORY. iBasis, Inc., a Delaware corporation (the "Company"),
proposes to issue and sell to the several underwriters named in Exhibit A
(the "Underwriters") an aggregate of 2,026,637 shares of its Common Stock,
par value $0.001 per share (the "Common Shares"). In addition, the
stockholders of the Company named in Exhibit B (the "Selling Stockholders")
propose to sell to the Underwriters an aggregate of 1,473,363 Common Shares.
The 2,026,637 Common Shares to be sold by the Company and the 1,473,363
Common Shares to be sold by the Selling Stockholders are collectively called
the "Firm Shares." In addition, the Company and certain of the Selling
Stockholders have granted to the Underwriters an option to purchase up to an
additional 525,000 Common Shares (the "Option Shares") as provided in Section
2. The Firm Shares and, if and to the extent such option is exercised, the
Option Shares, are collectively called the "Shares." FleetBoston Robertson
Stephens Inc., Chase Securities, Inc., U.S. Bancorp Piper Jaffray Inc. and
Dain Rauscher Incorporated have agreed to act as representatives of the
several Underwriters (in such capacity, the "Representatives,") in connection
with the offering and sale of the Shares.

         The Company has prepared and filed with the Securities and Exchange
Commission (the "Commission") a registration statement on Form S-1 (File No.
333-96535), which contains a form of prospectus to be used in connection with
the public offering and sale of the Shares. Such registration statement, as
amended, including the financial statements, exhibits and schedules thereto, in
the form in which it was declared effective by the Commission under the
Securities Act of 1933, as amended, and the rules and regulations promulgated
thereunder (collectively, the "Securities Act"), including any information
deemed to be a part thereof at the time of effectiveness pursuant to Rule 430A
or Rule 434 under the Securities Act, is called the "Registration Statement."
Any registration statement filed by the Company pursuant to Rule 462(b) under
the Securities Act is called the "Rule 462(b) Registration Statement," and from
and after the date and time of filing of the Rule 462(b) Registration Statement
the term "Registration Statement" shall include the Rule 462(b) Registration
Statement. Such prospectus, in the form first used by the Underwriter after
effectiveness of the Registration Statement to confirm sales of


<PAGE>


the Shares, is called the "Prospectus," PROVIDED, HOWEVER, if the Company
has, with the consent of FleetBoston Robertson Stephens Inc., elected to rely
upon Rule 434 under the Securities Act, the term "Prospectus" shall mean the
Company's prospectus subject to completion (each, a "preliminary prospectus")
dated February 22, 2000 (such preliminary prospectus is called the "Rule 434
preliminary prospectus"), together with the applicable term sheet (the "Term
Sheet") prepared and filed by the Company with, the Commission under Rules
434 and 424(b) under the Securities Act and all references in this Agreement
to the date of the Prospectus shall mean the date of the Term Sheet. All
references in this Agreement to the Registration Statement, the Rule 462(b)
Registration Statement, a preliminary prospectus, the Prospectus or the Term
Sheet, or any amendments or supplements to any of the foregoing, shall
include any copy thereof filed with the Commission pursuant to its Electronic
Data Gathering, Analysis and Retrieval System ("EDGAR").

         The Company and the Selling Stockholders hereby confirm their
respective agreements with the Underwriters as follows:

SECTION 1. REPRESENTATIONS AND WARRANTIES.

         A.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

         The Company hereby represents, warrants and covenants to each
Underwriter as follows:

         (a) COMPLIANCE WITH REGISTRATION REQUIREMENTS. The Registration
Statement and any Rule 462(b) Registration Statement have been declared
effective by the Commission under the Securities Act. The Company has complied
with all requests of the Commission for additional or supplemental information.
No, stop order suspending the effectiveness of the Registration Statement or any
Rule 462(b) Registration Statement is in effect and no proceeding for such
purpose have been instituted or are pending or, to the knowledge of the Company,
are contemplated or threatened by the Commission.

         Each preliminary prospectus and the Prospectus when filed complied in
all material respects with the Securities Act and, if filed by electronic
transmission pursuant to EDGAR (except as may be permitted by Regulation S-T
under the Securities Act), was identical to the copy thereof delivered to the
Underwriters for use in connection with the offer and sale of the Shares. Each
of the Registration Statement, any Rule 462(b) Registration Statement and any
post-effective amendment thereto, at the time it became effective and at all
subsequent times, complied in all material respects with the Securities Act and
did not at the time the Registration Statement was declared effective, and will
not contain on the Closing Date and on any Second Closing date, any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein in the light of the
circumstances under which they were made, not misleading. The Prospectus, as
amended or supplemented, as of its date and at all subsequent times prior to and
including the Closing Date and any Second Closing Date, did not and will not on
the Closing Date or any Second Closing Date contain any untrue statement of a
material fact or omit to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading. The representations and warranties set forth in the two
immediately preceding


                                      -2-


<PAGE>


sentences do not apply to statements in or omissions from the Registration
Statement, any Rule 462(b) Registration Statement, or any post-effective
amendment thereto, or the Prospectus, or any amendments or supplements thereto,
made in reliance upon and in conformity with information relating to any
Underwriter furnished to the Company in writing by the Representative expressly
for use therein. There are no contracts or other documents required to be
described in the Prospectus or to be filed as exhibits to the Registration
Statement which have not been described or filed as required.

         (b) OFFERING MATERIALS FURNISHED TO UNDERWRITERS. The Company has
delivered to the Representatives three complete conformed copies of the
Registration Statement and of each consent and certificate of experts filed as a
part thereof, and conformed copies of the Registration Statement (without
exhibits) and preliminary prospectuses and the Prospectus, as amended or
supplemented, in such quantities and at such places as the Representatives have
reasonably requested for each of the Underwriters.

         (c) DISTRIBUTION OF OFFERING MATERIAL BY THE COMPANY. The Company has
not distributed and will not distribute, prior to the later of the Second
Closing Date (as defined below), if any, and the completion of the Underwriters'
distribution of the Shares, any offering material in connection with the
offering and sale of the Shares other than a preliminary prospectus, the
Prospectus or the Registration Statement.

         (d) THE UNDERWRITING AGREEMENT. This Agreement has been duly
authorized, executed and delivered by, and is a valid and binding agreement of,
the Company, enforceable against the Company in accordance with its terms,
except as rights to indemnification and contribution hereunder may be limited by
applicable law and public policy and except as the enforcement hereof may be
limited by bankruptcy, insolvency, reorganization, moratorium or other similar
laws relating to or affecting the rights and remedies of creditors or by general
equitable principles.

         (e) AUTHORIZATION OF THE SHARES TO BE SOLD BY THE COMPANY. The Common
Shares to be purchased by the Underwriters from the Company have been duly
authorized for issuance and sale pursuant to this Agreement and, when issued and
delivered by the Company pursuant to this Agreement, against payment therefore,
will be validly issued, fully paid and nonassessable.

         (f) AUTHORIZATION OF THE SHARES TO BE SOLD BY THE SELLING STOCKHOLDERS.
The Common Shares to be purchased by the Underwriters from the Selling
Stockholders, when issued, were validly issued, fully paid and nonassessable.

         (g) No APPLICABLE REGISTRATION OR OTHER SIMILAR RIGHTS. There are no
persons with registration or other similar rights to have any equity or debt
securities registered for sale under the Registration Statement or included in
the offering contemplated by this Agreement, except for such rights as have been
satisfied under the Registration Statement, duly waived or have lapsed in
accordance with their terms.

         (h) NO MATERIAL ADVERSE CHANGE. Subsequent to the respective dates as
of which information is given in the Prospectus: (i) there has been no material
adverse change, or any


                                      -3-


<PAGE>


development that could reasonably be expected to result in a material adverse
change, in the condition, financial or otherwise, or in the earnings, business,
operations or prospects, whether or not arising from transactions in the
ordinary course of business, of the Company and its subsidiaries, considered as
one entity (any such change or effect, where the context so requires, is called
a "Material Adverse Change" or a "Material Adverse Effect"); (ii) the Company
and its subsidiaries, considered as one entity, have not incurred any material
liability or obligation, indirect, direct or contingent, not in the ordinary
course of business nor entered into any material transaction or agreement not in
the ordinary course of business; and (iii) there has been no dividend or
distribution of any kind declared, paid or made by the Company or, except for
dividends paid to the Company or other subsidiaries, any of its subsidiaries on
any class of capital stock or repurchase or redemption by the Company or any of
its subsidiaries of any class of capital stock.

         (i) INDEPENDENT ACCOUNTANTS. Arthur Anderson LLP, who have expressed
their opinion with respect to the financial statements (which term as used in
this Agreement includes the related notes thereto) and supporting schedules
filed with the Commission as a part of the Registration Statement and included
in the Prospectus, are independent public or certified public accountants as
required by the Securities Act.

         (j) PREPARATION OF THE FINANCIAL STATEMENTS. The financial statements
filed with the Commission as a part of the Registration Statement and included
in the Prospectus present fairly the consolidated financial position of the
Company and its subsidiaries as of and at the dates indicated and the results of
their operations and cash flows for the periods specified. The supporting
schedules included in the Registration Statement present fairly the information
required to be stated therein. Such financial statements and supporting
schedules have been prepared in conformity with generally accepted accounting
principles as applied in the United States, ("U.S. GAAP") applied on a
consistent basis throughout the periods involved, except as may be expressly
stated in the related notes thereto. No other financial statements or supporting
schedules are required to be included in the Registration Statement. The
financial data set forth in the Prospectus under the captions "Summary-Summary
Consolidated Financial Data," "Selected Consolidated Financial Data" and
"Capitalization" fairly present the information set forth therein on a basis
consistent with that of the audited financial statements contained in the
Registration Statement other than the absence of footnotes. The pro forma and
pro forma as adjusted consolidated balance sheet data of the Company and its
subsidiaries and the related notes thereto included under the caption
"Summary--Summary Consolidated Financial Data," "Selected Consolidated Financial
Data" and elsewhere in the Prospectus and in the Registration Statement present
fairly the information contained therein, have been prepared in accordance with
the Commission's rules and guidelines with respect to pro forma financial
statements and have been properly presented on the bases described therein, and
the assumptions used in the preparation thereof are reasonable and the
adjustments used therein are appropriate to give effect to the transactions and
circumstances referred to therein. No other pro forma financial information is
required to be included in the Registration Statement pursuant to Regulation
S-X.

         (k) COMPANY'S ACCOUNTING SYSTEM. The Company and each of its
subsidiaries maintains a system of accounting controls sufficient to provide
reasonable assurances that (i) transactions are executed in accordance with
management's general or specific authorization;


                                      -4-


<PAGE>


(ii) transactions are recorded as necessary to permit preparation of financial
statements in conformity with U.S. GAAP and to maintain accountability for
assets; (iii) access to assets is permitted only in accordance with management's
general or specific authorization; and (iv) the recorded accountability for
assets is compared with existing assets at reasonable intervals and appropriate
action is taken with respect to any differences.

         (l) SUBSIDIARIES OF THE COMPANY. The Company does not own or control,
directly or indirectly, any corporation, association or other entity other than
as listed in Exhibit 21.1 to the Registration Statement. The subsidiaries
considered in the aggregate as a single subsidiary, would not constitute a
"significant subsidiary," as defined in Rule 1-02(v) of Regulation S-X under the
Securities Act.

         (m) INCORPORATION AND GOOD STANDING OF THE COMPANY AND ITS
SUBSIDIARIES. Each of the Company and its subsidiaries has been duly organized
and is validly existing as a corporation or limited liability company, as the
case may be, in good standing under the laws of the jurisdiction in which it is
organized with full corporate power and authority to own its properties and
conduct its business as described in the Prospectus, and is duly qualified to do
business as a foreign corporation and is in good standing under the laws of each
jurisdiction which requires such qualification, except where the failure to be
so qualified will not have a Material Adverse Change.

         (n) CAPITALIZATION AND OTHER CAPITAL STOCK. The authorized, issued
and outstanding capital stock of the Company, upon consummation of the
Closing and assuming no issuance of any of the Company's 5 3/4% Convertible
Subordinated Notes due 2005 that are being offered in a concurrent public
offering or issuance of Common Stock upon the conversion thereof, will be as
set forth in the Prospectus under the caption "Capitalization" (other than
for subsequent issuances, if any, pursuant to employee benefit plans
described in the Prospectus or upon exercise of outstanding options or
warrants described in the Prospectus). The Common Shares (including the
Shares) conform in all material respects to the description thereof contained
in the Prospectus. All of the issued and outstanding Common Shares, upon the
consummation of the Closing, will have been duly authorized and validly
issued, fully paid and nonassessable and will have been issued in compliance
with federal and state securities laws. None of the outstanding Common Shares
Will have been issued in violation of any preemptive rights, rights of first
refusal or other similar rights to subscribe for or purchase securities of
the Company. There are no authorized or outstanding options, warrants,
preemptive rights, rights of first refusal or other rights to purchase or
equity or debt securities convertible into or exchangeable or exercisable
for, any capital stock of the Company or any of its subsidiaries other than
those accurately and completely described in the Prospectus. The description
of the Company's stock option, stock bonus and other stock plans or
arrangements, and the options or other rights granted thereunder, set forth
in the Prospectus accurately and completely presents the information required
to be shown with respect to such plans, arrangements, options and rights.

         (o) STOCK EXCHANGE LISTING. The Shares have been registered pursuant to
Section 12(g) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act") and are approved for quotation on the Nasdaq National Market, subject only
to official notice of issuance, and the Company has taken no action designed to,
or likely to have the effect of,


                                      -5-


<PAGE>


terminating the registration of the Common Shares under the Exchange Act or
delisting the Common Shares from the Nasdaq National Market, nor has the Company
received any notification that the Commission or the National Association of
Securities Dealers, LLC (the "NASD") is contemplating terminating such
registration or listing.

         (p) NO CONSENTS, APPROVALS OR AUTHORIZATIONS REQUIRED. No consent,
approval, authorization, filing with or order of any court or governmental
agency or regulatory body is required in connection with the transactions
contemplated herein, except such as have been obtained or made under the
Securities Act and such as may be required (i) under the blue sky laws of any
jurisdiction in connection with the purchase and distribution of the Shares by
the Underwriters in the manner contemplated here and in the Prospectus, (ii) by
the NASD and (iii) by the federal and provincial law of Canada.

         (q) NON-CONTRAVENTION OF EXISTING INSTRUMENTS AGREEMENTS. Neither the
issue and sale of the Shares nor the consummation of any other of the
transactions herein contemplated nor the fulfillment of the terms hereof will
conflict with, result in a breach or violation or imposition of any lien, charge
or encumbrance upon any property or assets of the Company or any of its
subsidiaries pursuant to, (i) the charter or by-laws of the Company or any of
its subsidiaries, (ii) the terms of any indenture, contract, lease, mortgage,
deed of trust, note agreement, loan agreement or other agreement, obligation,
condition, covenant or instrument to which the Company or any of its
subsidiaries is a party or bound or to which its or their property is subject or
(iii) any statute, law, rule, regulation, judgment, order or decree applicable
to the Company or any of its subsidiaries of any court, regulatory body,
administrative agency, governmental body, arbitrator or other authority having
jurisdiction over the Company or any of its subsidiaries or any of its or their
respective properties.

         (r) NO DEFAULTS OR VIOLATIONS. Neither the Company nor any subsidiary
is in violation or default of (i) any provision of its charter or by-laws, (ii)
the terms of any indenture, contract, lease, mortgage, deed of trust, note
agreement, loan agreement or other agreement, obligation, condition, covenant or
instrument to which it is a party or bound or to which its property is subject
or (iii) any statute, law, rule, regulation, judgment, order or decree of any
court; regulatory body, administrative agency, governmental body, arbitrator or
other authority having jurisdiction over the Company or such subsidiary or any
of their respective properties, as applicable, except any such violations or
defaults which would not, singly or in the aggregate, result in a Material
Adverse Change or except as otherwise disclosed in the Prospectus.

         (s) NO ACTIONS, SUITS OR PROCEEDINGS. No action, suit or proceeding by
or before any court or governmental agency, authority or body or any arbitrator
involving the Company or any of its subsidiaries or its or their respective
properties is pending or, to the knowledge of the Company, threatened that (i)
could reasonably be expected to have a Material Adverse Effect on the
performance of this Agreement or the consummation of any of the transactions
contemplated hereby or (ii) could reasonably be expected to result in a Material
Adverse Effect.

         (t) ALL NECESSARY PERMITS, ETC. The Company and each subsidiary possess
such valid and current certificates, authorizations or permits issued by the
appropriate federal, state, local or foreign regulatory agencies or bodies
necessary to conduct their respective businesses, and


                                      -6-


<PAGE>


neither the Company nor any subsidiary has received any notice of proceedings
relating to the revocation or modification of, or non-compliance with, any such
certificate, authorization or permit which singly or in the aggregate, if the
subject of an unfavorable decision, ruling or finding, could reasonably be
expected to result in a Material Adverse Change.

         (u) TITLE TO PROPERTIES. The Company and each of its subsidiaries has
good and marketable title to all the properties and assets reflected as owned in
the financial statements referred to in Section 1(A)(j) above (or elsewhere in
the Prospectus), in each case free and clear of any security interests,
mortgages, liens, encumbrances, equities, claims and other defects, except such
as do not materially and adversely affect the value of such property and do not
materially interfere with the use made or proposed to be made of such property
by the Company or such subsidiary. The real property, improvements, equipment
and personal property held under lease by the Company or any subsidiary are held
under leases, with such exceptions, if any, as are not material and do not
materially interfere with the use made or proposed to be made of such real
property, improvements, equipment or personal property by the Company or such
subsidiary.

         (v) TAX LAW COMPLIANCE. The Company and its consolidated subsidiaries
have filed all necessary federal, state, local and foreign income and franchise
tax returns or have properly requested extensions thereto and have paid all
taxes required to be paid by any of them and, if due and payable, any related or
similar assessment, fine or penalty levied against any of them except as may be
being contested in good faith and by appropriate proceedings. The Company has
made adequate charges, accruals and reserves in the applicable financial
statements referred to in Section 1(A)(j) above in respect of all federal,
state, local and foreign income and franchise taxes for all periods as to which
the tax liability of the Company of its consolidated subsidiaries has not been
finally determined. The Company is not aware of any tax deficiency that has been
or might be asserted or threatened against the Company that could result in a
Material Adverse Change.

         (w) INTELLECTUAL PROPERTY RIGHTS. Each of the Company and its
subsidiaries owns or possesses legally enforceable rights to use all patents,
patent rights or licenses, inventions, collaborative research agreements, trade
secrets, know-how, trademarks, service marks, trade names and copyrights which
are necessary to conduct its businesses as described in the Registration
Statement and Prospectus; the expiration of any patents, patent rights, trade
secrets trademarks, service marks, trade names or copyrights would not result in
a Material Adverse Change that is not otherwise accurately and completely
described in the Prospectus; the Company has not received any notice of, and has
no knowledge of any infringement of or conflict with asserted rights of the
Company by others with respect to any patent, patent rights, inventions, trade
secrets, know-how, trademarks, service marks, trade names or copyrights; and the
Company has not received any notice of, and has no knowledge of, any
infringement of or conflict with asserted rights of others with respect to any
patent, patent rights, inventions, trade secrets, know-how, trademarks, service
marks, trade names or copyrights which, singly or in the aggregate, if the
subject of an unfavorable decision, ruling or finding, could reasonably be
expected to result in a Material Adverse Change. There is no claim being made
against the Company regarding patents, patent trademarks, service marks, trade
names or copyright that could reasonably be expected to result in a Material
Adverse Effect. The Company and its


                                      -7-


<PAGE>


subsidiaries do not in the conduct of their business as now conducted and as
proposed to be conducted as described in the Prospectus infringe or conflict
with any right or patent of any third party, or any discovery, invention,
product or process which is the subject of a patent application filed by any
third party, known to the Company or any of its subsidiaries, which such
infringement or conflict could reasonably be expected to result in a Material
Adverse Change.

         (x) YEAR 2000 PREPAREDNESS. There are no issues related to the
Company's, or any of its subsidiaries', preparedness for the Year 2000 that (i)
are of a character required to be described or referred to in the Registration
Statement or Prospectus by the Securities Act which have not been accurately and
completely described in the Registration Statement or Prospectus or (ii) could
reasonably be expected to result in any Material Adverse Change or that might
materially affect the properties, assets or rights of the Company or any of its
Subsidiaries. All internal computer systems and each Constituent Component (as
defined below) of those systems and all computer-related products and each
Constituent Component of those products of the Company and each of its
subsidiaries fully comply with Year 2000 Qualification Requirements. For
purposes of this Agreement, "Year 2000 Qualifications Requirements" means that
the internal computer systems and each Constituent Component (as defined below)
of those systems and all computer-related products and each Constituent
Component (as defined below) of those products of the Company and each of its
Subsidiaries (i) have been reviewed to confirm that they store, process
(including sorting and performing mathematical operations, calculations and
computations), input and output data-containing date and information correctly
regardless of whether the date contains dates and times before, on or after
January 1, 2000, (ii) have been designated to ensure date and time entry
recognition and calculations, and date data interface values that reflect the
century, (iii) accurately manage and manipulate data involving dates and times,
including single century formulas and multi-century formulas, and will not cause
an abnormal ending scenario within the application or generate incorrect values
or invalid results involving such dates, (iv) accurately process any date
rollover, and (v) accept and respond to two-digit year date input in a manner
that resolves any ambiguities as to the century. For purposes of this Agreement,
"Constituent Component" means all software (including operating systems,
programs, packages and utilities), firmware, hardware, networking components,
and peripherals provided as part of the configuration. The Company has inquired
of material vendors as to their preparedness for the Year 2000 and has disclosed
in the Registration Statement or Prospectus any issues relating to such material
vendors and known to the Company that could reasonably be expected to result in
any Material Adverse Change.

         (y) NO TRANSFER TAXES OR OTHER FEES. There are no transfer taxes or
other similar fees or charges under federal, state, local or foreign laws
required to be paid in connection with the execution and delivery of this
Agreement or the issuance and sale by the Company of the Shares.

         (z) COMPANY NOT AN "INVESTMENT COMPANY". The Company has been advised
of the rules and requirements under the Investment Company Act of 1940, as
amended (the "Investment Company Act"). The Company is not, and after receipt of
payment for the Shares will not be, an "investment company" or an entity
"controlled" by an "investment company" within the meaning of the Investment
Company Act and will conduct its business in a manner so that it will not become
subject to the Investment Company Act.


                                      -8-


<PAGE>


         (aa) INSURANCE. Except as otherwise accurately and completely described
in the Prospectus, each of the Company and its subsidiaries is insured by
recognized, financially sound and reputable institutions with policies in such
amounts and with such deductibles and covering such risks as are generally
deemed adequate and customary for their businesses including, but not limited
to, policies covering real and personal property owned or leased by the Company
and its subsidiaries against theft, damage, destruction, acts of vandalism and
earthquakes, general liability and Directors and Officers liability. The Company
has no reason to believe that it or any subsidiary will not be able (i) to renew
its existing insurance coverage as and when such policies expire or (ii) to
obtain comparable coverage from similar institutions as may be necessary or
appropriate to conduct its business as now conducted and at a cost that would
not result in a Material Adverse Change. Neither of the Company nor any
subsidiary has been denied any insurance coverage which it has sought or for
which it has applied.

         (bb) LABOR MATTERS. To the Company's knowledge, no labor disturbance by
the employees of the Company or any of its subsidiaries exists or is imminent;
and the Company is not aware of any existing or imminent labor disturbance by
the employees of any of its principal suppliers that could reasonably be
expected to result in a Material Adverse Change.

         (cc) NO PRICE STABILIZATION OR MANIPULATION. The Company and, to its
knowledge, each of its directors and officers, has not taken and will not take,
directly or indirectly, any action designed to or that could reasonably be
expected to cause or result in stabilization or manipulation of the price of the
Common Stock to facilitate the sale or resale of the Shares.

         (dd) LOCK-UP AGREEMENTS. Each officer and director of the company, each
Selling Stockholder and each beneficial owner of one or more percent of the
outstanding issued share capital of the Company (or option to acquire the same)
has signed an agreement in the form attached hereto as EXHIBIT A (the "Lock-up
Agreements"). The Company has provided to counsel for the Underwriters a
complete and accurate list of all securityholders of the Company and the number
and type of securities held by each securityholder. The Company has provided to
counsel for the Underwriters true, accurate and complete copies of all of the
Lock-up Agreements presently in effect or effected hereby. The Company hereby
represents and warrants that it will not release any of its officers, directors
or other stockholders from any Lock-up Agreements currently existing or
hereafter effected without the prior written consent of FleetBoston Robertson
Stephens Inc.

         (ee) RELATED PARTY TRANSACTIONS. There are no business relationships or
related-party transactions involving the Company or any subsidiary or any other
person required to be described in the Prospectus which have not been accurately
and completely described.

         (ff) NO UNLAWFUL CONTRIBUTIONS OR OTHER PAYMENTS. Neither the Company
nor any of its subsidiaries nor, to the Company's knowledge, any employee or
agent of the Company or any subsidiary, has made any contribution or other
payment to any official of, or candidate for, any federal, state or foreign
office in violation of any law or of the character required to be disclosed in
the Prospectus.


                                      -9-


<PAGE>


         (gg) ENVIRONMENTAL LAWS. (i) The Company is in compliance with all
rules, laws and regulations relating to the use, treatment, storage and
disposal of toxic substances and protection of health or the environment
("Environmental Laws") which are applicable to its business, except where the
failure to comply would not result in a Material Adverse Change, (ii) the
Company has received no notice from any governmental authority or third party
of an asserted claim under Environmental Laws, which claim is required to be
disclosed in the Registration Statement and the Prospectus, (iii) the Company
will not be required to make future material capital expenditures to comply
with Environmental Laws and (iv) no property which is owned, leased or
occupied by the Company has been designated as a Superfund site pursuant to
the Comprehensive Response, Compensation, and Liability Act of 1980, as
amended (42 U.S.C. Section 9601, ET SEQ.), or otherwise designated as a
contaminated site under applicable state or local law.

         (hh) ERISA COMPLIANCE. The Company and its subsidiaries and any
"employee benefit plan" (as defined under the Employee Retirement Income
Security Act of 1974, as amended, and the regulations and published
interpretations thereunder (collectively, "ERISA")) established or maintained by
the Company, its subsidiaries or their "ERISA Affiliates" (as defined below) are
in compliance in all material respects with ERISA. "ERISA Affiliate" means, with
respect to the Company or a subsidiary, any member of any group of organizations
described in Sections 414(b), (c), (m) or (o) of the Internal Revenue Code of
1986, as amended, and the regulations and published interpretations thereunder
(the "Code") of which the Company or such subsidiary is a member. No "reportable
event" (as defined under ERISA) has occurred or is reasonably expected to occur
with respect to any "employee benefit plan" established or maintained by the
Company, its subsidiaries or any of their ERISA Affiliates. No "employee benefit
plan" established or maintained by the Company, its subsidiaries or any of their
ERISA Affiliates, if such "employee benefit plan" were terminated, would have
any "amount of unfounded benefit liabilities" (as defined under ERISA). Neither
the Company, its subsidiaries nor any of their ERISA Affiliates has incurred or
reasonably expects to incur any liability under (i) Title IV of ERISA with
respect to termination of, or withdrawal from, any "employee benefit plan" or
(ii) Sections 412, 4971, 4975 or 4980B of the Code. Each "employee benefit plan"
established or maintained by the Company, its subsidiaries or any of their ERISA
Affiliates that is intended to be qualified under Section 401(a) of the Code is
so qualified and nothing has occurred, whether by action or failure to act,
which would cause the loss of such qualification.

         (ii) EXCHANGE ACT REPORTS FILED. The Company has filed all reports
required to be filed pursuant to the Securities Act and the Exchange Act.

         Any certificate signed by an executive officer of the Company and
delivered to the Representative or to counsel for the Underwriters at the
closing of any sale of the Shares shall be deemed to be a representation and
warranty by the Company to each Underwriter as to the matters set forth therein.

         B.   REPRESENTATIONS AND WARRANTIES OF THE SELLING STOCKHOLDERS.
         Each Selling Stockholder, severally and not jointly, represents,
warrants and covenants with each Underwriter as follows:


                                      -10-


<PAGE>


         (a) THE UNDERWRITING AGREEMENT. This Agreement has been duly
authorized, executed and delivered by or on behalf of such Selling Stockholder
and is a valid and binding agreement of such Selling Stockholder, enforceable in
accordance with its terms, except as rights to indemnification hereunder may be
limited by applicable law and except as the enforcement hereof may be limited by
bankruptcy, insolvency, reorganization, moratorium or other similar laws
relating to or affecting the rights and remedies of creditors or by general
equitable principles.

         (b) THE CUSTODY AGREEMENT AND POWER OF ATTORNEY. Each of the (i)
Custody Agreement signed by such Selling Stockholder and EquiServe Trust
Company, N.A., as custodian (the "Custodian"), relating to the deposit of the
Shares to be sold by such Selling Stockholder (the "Custody Agreement") and
(ii) Power of Attorney appointing certain individuals named therein as such
Selling Stockholder's attorneys-in-fact (each, an "Attorney-in-Fact") to the
extent set forth therein relating to the transactions contemplated hereby and
by the Prospectus (the "Power of Attorney"), of such Selling Stockholder has
been duly authorized, executed and delivered by such Selling Stockholder and
is a valid and binding agreement of such Selling Stockholder, enforceable
against such Selling Stockholder in accordance with its terms, except as
rights to indemnification thereunder may be limited by applicable law and
except as the enforcement thereof may be limited by bankruptcy, insolvency,
reorganization, moratorium or other similar laws relating to or affecting the
rights and remedies of creditors or by general equitable principles. Each
Selling Stockholder agrees that the Shares to be sold by such Selling
Stockholder on deposit with the Custodian are subject to the interests of the
Underwriters, that the arrangements made for such custody are to that extent
irrevocable, and that the obligations of such Selling Stockholder hereunder
shall not be terminated, except as provided in this Agreement or in the
Custody Agreement, by any act of the Selling Stockholder, by operation of
law, by death or incapacity of such Selling Stockholder or by the occurrence
of any other event. If such Selling Stockholder should die or become
incapacitated, or if any other event should occur, before the delivery of the
Shares to be sold by such Selling Stockholder hereunder, the documents
evidencing the Shares to be sold by such Selling Stockholder then on deposit
with the Custodian shall be delivered by the Custodian in accordance with the
terms and conditions of this Agreement as if such death, incapacity or other
event had not occurred, regardless of whether or not the Custodian shall have
received notice thereof.

         (c) TITLE TO SHARES TO BE SOLD. Such Selling Stockholder is the lawful
owner of the Shares to be sold by such Selling Stockholder hereunder and upon
sale and delivery of, and payment for, such Shares, as provided herein, such
Selling Stockholder will convey good and marketable title to such Shares, free
and clear of all liens, encumbrances, equities and claims whatsoever.

         (d) ALL AUTHORIZATIONS OBTAINED. Such Selling Stockholder has, and on
the First Closing Date and, if applicable, the Second Closing Date (as defined
below) will have, good and valid title to all of the Common Shares which may be
sold by such Selling Stockholder pursuant to this Agreement on such date and the
legal right and power, and all authorizations and approvals required by law to
enter into this Agreement and the Custody Agreement and Power of Attorney, to
sell, transfer and deliver all of the Shares which maybe sold by such Selling


                                      -11-


<PAGE>


Stockholder pursuant to this Agreement and to comply with its other obligations
hereunder and thereunder.

         (e) NO FURTHER CONSENTS, AUTHORIZATION OR APPROVALS. No consent,
approval, authorization or order of any court or governmental agency or body is
required for the consummation by such Selling Stockholder of the transactions
contemplated herein, except such as may have been obtained under the Securities
Act and such as may be required under the federal and provincial securities laws
of Canada or the blue sky laws or any jurisdiction in connection with the
purchase and distribution of the Shares by the Underwriters and such other
approvals as have been obtained.

         (f) NON-CONTRAVENTION. Neither the sale of the Shares being sold by
such Selling Stockholder nor the consummation of any other of the transactions
herein contemplated by such Selling Stockholder or the fulfillment of the terms
hereof by such Selling Stockholder will conflict with, result in a breach or
violation of, or constitute a default under any law or the terms of any
indenture or other agreement or instrument to which such Selling Stockholder is
party or bound, any judgment, order or decree applicable to such Selling
Stockholder or any court or regulatory body, administrative agency, governmental
body or arbitrator having jurisdiction over such Selling Stockholder.

         (g) NO REGISTRATION OR OTHER SIMILAR RIGHTS. Such Selling Stockholder
does not have, or has waived prior to the date hereof or otherwise had satisfied
any registration or other similar rights to have any equity or debt securities
registered for sale by the Company (i) under the Registration Statement or
included in the offering contemplated by this Agreement or (ii) under the
registration statement (Registration No. 333-96533) filed concurrently with the
Registration Statement in connection with the offering by the Company of up to
$172,500,000 aggregate principal amount of  % Convertible Subordinated Notes
due 2005 (the "Debt Offering") or included in the offering contemplated by
the underwriting agreement entered into by the Company in connection with the
Debt Offering..

         (h) NO PREEMPTIVE, CO-SALE OR OTHER RIGHTS. Such Selling Stockholder
does not have, or has waived prior to the date hereof, any preemptive right,
co-sale right or right of first refusal or other similar right to purchase any
of the Shares that are to be sold by the Company to the Underwriters pursuant to
this Agreement.

         (i) DISCLOSURE MADE BY SUCH SELLING STOCKHOLDER IN THE PROSPECTUS. All
information furnished by or on behalf of the Selling Stockholder in writing
expressly for use in the Registration Statement and Prospectus is, and on the
First Closing Date and, if applicable, the Second Closing Date (as defined
below) will be, true, correct, and complete in all material respects, and does
not, and on the First Closing Date and, if applicable, the Second Closing Date,
will not, contain any untrue statement of a material fact or omit to state any
material fact necessary to make such information not misleading. Such Selling
Stockholder confirms as accurate the number of shares of Common Shares set forth
opposite such Selling Stockholder's name in the Prospectus under the caption
"Principal and Selling Stockholders" (both prior to and after giving effect to
the sale of the Shares).


                                      -12-


<PAGE>


         (j) NO PRICE STABILIZATION OR MANIPULATION. Such Selling Stockholder
has not taken and will not take, directly or indirectly, any action designed to
or that might be reasonably expected to cause or result in stabilization or
manipulation of the price of the Common Stock to facilitate the sale or resale
of the Shares.

         (k) NO TRANSFER TAXES OR OTHER FEES. There are no transfer taxes or
other similar fees or charges under Federal law or the laws of any state, or any
political subdivision thereof, required to be paid in connection with the
execution and delivery of this Agreement or the sale by such Selling Stockholder
of the Shares.

         (l) DISTRIBUTION OF OFFERING MATERIALS BY THE SELLING STOCKHOLDERS.
Such Selling Stockholder has not distributed and will not distribute, prior to
the later of the Second Closing Date (as defined below) and the completion of
the Underwriters' distribution of the Shares, any offering material in
connection with the offering and sale of the Shares by such Selling Stockholder
other than a preliminary prospectus, the Prospectus or the Registration
Statement.

         (m) CONFIRMATION OF COMPANY REPRESENTATIONS AND WARRANTIES. Such
Selling Stockholder is not prompted to sell the Shares to be sold by such
Selling Stockholder by any material information concerning the Company which is
not set forth in the Registration Statement and the Prospectus. Such Selling
Stockholder, if a director and/or an officer of the Company, is aware of no fact
that causes such Selling Stockholder to believe that the representations and
warranties of the Company contained in Section 1(A) hereof are not true and
correct in all material respects.

         Any certificate signed by or on behalf of the Selling Stockholder and
delivered to the Representatives or to counsel for the Underwriters shall be
deemed to be a representation and warranty by such Selling Stockholder to each
Underwriter as to the matters covered thereby.

         SECTION 2.  PURCHASE, SALE AND DELIVERY OF THE SHARES.

         (a) THE FIRM SHARES. Upon the terms set forth herein, (i) the
Company agrees to issue and sell to the several Underwriters an aggregate of
2,026,637 Firm Shares and (ii) the Selling Stockholders agree to sell to the
several Underwriters an aggregate of 1,473,363 Firm Shares, each such Selling
Stockholder selling the number of Firm Shares set forth opposite such Selling
Stockholder's name on SCHEDULE B. On the basis of the representations,
warranties and agreements herein contained, and upon the terms but subject to
the conditions herein set forth, the Underwriters agree, severally and not
jointly, to purchase from the Company and the Selling Stockholders the
respective number of Firm Shares set forth opposite their names on SCHEDULE
A. The purchase price per Firm Share to be paid by the several Underwriters
to the Company and the Selling Stockholders shall be $73.00 per share.

         (b) THE FIRST CLOSING DATE. Delivery of the Firm Shares to be purchased
by the Underwriters and payment therefor shall be made by the Company and the
Representative at 6:00 a.m. San Francisco time, at the offices of Bingham Dana
LLP (or at such other place as may be agreed upon among the Representatives and
the Company), (i) on the third (3rd) full business day following the first day
that Shares are traded, (ii) if this Agreement is executed and


                                      -13-


<PAGE>


delivered after 1:30 P.M., San Francisco time, the fourth (4th) full business
day following the day that this Agreement is executed and delivered or (iii) at
such other time and date not later that seven (7) full business days following
the first day that Shares are traded as the Representative and the Company may
determine (or at such time and date to which payment and delivery shall have
been postponed pursuant to Section 8 hereof), such time and date of payment and
delivery being herein called the "Closing Date;" PROVIDED, HOWEVER, that if the
Company has not made available to the Representatives copies of the Prospectus
within the time provided in Section 4(d) hereof, the Representative may, in its
sole discretion, postpone the Closing Date until no later that two (2) full
business days following delivery of copies of the Prospectus to the
Representative.

         (c) THE OPTION SHARES; THE SECOND CLOSING DATE. In addition, on the
basis of the representations, warranties and agreements herein contained, and
upon the terms but subject to the conditions herein set forth, (i) the
Company hereby grants an option (the "Over-Allotment Option") to the several
Underwriters to purchase, severally and not jointly, up to an aggregate of
413,408 Option Shares from the Company and (ii) certain of the Selling
Stockholders hereby grant an option to the several Underwriters to purchase,
severally and not jointly, up to an aggregate of 111,592 Option Shares, such
Selling Stockholder selling the number of Option Shares set forth opposite
such Selling Stockholder's name on SCHEDULE B. THE OPTION SHARES SHALL BE
purchased at the purchase price per share to be paid by the Underwriters for
the Firm Shares. The Over Allotment Option is for use by the Underwriters
solely in covering any over-allotments in connection with the sale and
distribution of the Firm Shares. The Over-Allotment Option may be exercised
at any time upon notice by the Representatives to the Company, which notice
may be given at any time within 30 days from the date of this Agreement. The
time and date of delivery of the Option Shares, if subsequent to the First
Closing Date, is called the "Second Closing Date" and shall be determined by
the Representatives and shall not be earlier than three nor later than five
full business days after delivery of such notice of exercise. If any Option
Shares are to be purchased, each Underwriter agrees, severally and not
jointly, to purchase the number of Option Shares (subject to such adjustments
to eliminate fractional shares as the Representatives may determine) that
bears the same proportion to the total number of Option Shares to be
purchased as the number of Firm Shares set forth on SCHEDULE A opposite the
name of such Underwriter bears to the total number of Firm Shares. In the
event that the Over-Allotment Option is not exercised in full, the Option
Shares shall be allocated among the Company and the Selling Stockholders as
follows. First, each of Ofer Gneezy and Gordon VanderBrug shall sell up to
the number of shares set forth next to such Selling Stockholders' names on
SCHEDULE B (such shares to be allocated among such Selling Stockholders pro
rata based upon such maximum share amounts if the Over-Allotment Option is
exercised for fewer than 111,592 shares). Any remaining Option Shares shall
be sold by the Company. The Representatives may cancel the Over-Allotment
Option at any time prior to its expiration by giving written notice of such
cancellation to the Company.

                                      -14-


<PAGE>


         (d) PUBLIC OFFERING OF THE SHARES. The Representatives hereby advise
the Company and the Selling Stockholders that the Underwriters intend to offer
for sale to the public, as described in the Prospectus, their respective
portions of the Shares as soon after this Agreement has been executed and the
Registration Statement has been declared effective as the Representatives, in
their sole judgment, have determined is advisable and practicable.

         (e) PAYMENT FOR THE SHARES. Payment for the Shares sold by the Company
shall be made at the First Closing Date (and, if applicable, at the Second
Closing Date) by wire transfer in immediately available-funds to the order of
the Company. Payment for the Shares sold by the Selling Stockholders shall be
made at the First Closing Date (and, if applicable, at the Second Closing Date)
by wire transfer of immediately available funds to the order of the Custodian.

         It is understood that the Representatives have been authorized, for
their own accounts and the accounts of the several Underwriters, to accept
delivery of and receipt for, and make payment of the purchase price for, the
Firm Shares and any Option Shares the Underwriters have agreed to purchase.
FleetBoston Robertson Stephens Inc., individually and not as a Representative of
the Underwriters, may (but shall not be obligated to) make payment for any
Shares to be purchased by any Underwriter whose funds shall not have been
received by the Representatives by the First Closing Date or the Second Closing
Date, as the case may be, for the account of such Underwriter, but any such
payment shall not relieve such Underwriter from any of its obligations under
this Agreement.

         Each Selling Stockholder hereby agrees that (i) it will pay all stock
transfer taxes, stamp duties and other similar taxes, if any, payable upon the
sale or delivery of the Shares to be sold by such Selling Stockholder to the
several Underwriters, or otherwise in connection with the performance of such
Selling Stockholder's obligations hereunder and (ii) the Custodian is authorized
to deduct for such payment any such amounts from the proceeds to such Selling
Stockholder hereunder and to hold such amounts for the account of such Selling
Stockholder with the Custodian under the Custody Agreement.

         (f) DELIVERY OF THE SHARES. The Company shall deliver, or cause to be
delivered, a credit representing the Firm Shares to an account or accounts at
The Depository Trust Company, as designated by the Representatives for the
accounts of the Representatives and the several Underwriters at the First
Closing Date, against the irrevocable release of a wire transfer of immediately
available funds for the amount of the purchase price therefor. The Company shall
also deliver, or cause to be delivered a credit representing the Option Shares
the Underwriters have agreed to purchase at the First Closing Date (or the
Second Closing Date, as the case may be), to an account or accounts at The
Depository Trust Company as designated by the Representatives for the accounts
of the Representatives and the several Underwriters, against the irrevocable
release of a wire transfer of immediately available funds for the amount of the
purchase price therefor. Time shall be of the essence, and delivery at the time
and place specified in this Agreement is a further condition to the obligations
of the Underwriters.

         SECTION 3.  COVENANTS OF THE COMPANY.

         A.  COVENANTS OF THE COMPANY


                                      -15-


<PAGE>


         The Company further covenants and agrees with each Underwriter as
follows:

         (a) REGISTRATION STATEMENT MATTERS. The Company will (i) use its best
efforts to cause the Registration Statement to be declared effective or, if the
procedure in Rule 430A of the Securities Act is followed, to prepare and timely
file with the Commission under Rule 424(b) under the Securities Act a Prospectus
in a form approved by the Representatives containing information previously
omitted at the time of effectiveness of the Registration Statement in reliance
on Rule 430A of the Securities Act and (ii) not file any amendment to the
Registration Statement or supplement to the Prospectus of which the
Representatives shall not previously have been advised and furnished with a copy
or to which the Representatives shall have reasonably objected in writing or
which is not in compliance with the Securities Act. If the Company elects to
rely on Rule 462(b) under the Securities Act, the Company shall file a Rule
462(b) Registration Statement with the Commission in compliance with Rule 462(b)
under the Securities Act prior to the time confirmations are sent or given, as
specified by Rule 462(b)(2) under the Securities Act, and shall pay the
applicable fees in accordance with Rule 111 under the Securities Act.

         (b) SECURITIES ACT COMPLIANCE. The Company will advise the
Representatives promptly (i) when the Registration Statement or any
post-effective amendment thereto shall be declared effective, (ii) of receipt of
any comments from the Commission, (iii) of any request of the Commission for
amendment of the Registration Statement or for supplement to the Prospectus or
for any additional information and (iv) of the issuance by the Commission of any
stop order suspending the effectiveness of the Registration Statement or the use
of the Prospectus or of the institution of any proceedings for that purpose. The
Company will use its best efforts to prevent the issuance of any such stop order
preventing or suspending the use of the Prospectus and to obtain as soon as
possible the lifting thereof, if issued.

         (c) BLUE SKY COMPLIANCE. The Company will cooperate with the
Representatives and counsel for the Underwriters in endeavoring to qualify the
Shares for sale under the securities laws of such jurisdictions (both national
and foreign) as the Representatives may reasonably request and will make such
applications, file such documents, and furnish such information as may be
reasonably required for that purpose, provided the Company shall not be required
to qualify as a foreign corporation or to file a general consent to service of
process in any jurisdiction where it is not now so qualified or required to file
such a consent. The Company will, from time to time, prepare and file such
statements, reports and other documents, as are or may be required to continue
such qualifications in effect for so long a period as the Representatives may
reasonably request for distribution of the Shares.

         (d) AMENDMENTS AND SUPPLEMENTS TO THE PROSPECTUS AND OTHER SECURITIES
ACT MATTERS. The Company will comply with the Securities Act and the Exchange
Act, and the rules and regulations of the Commission thereunder, so as to permit
the completion of the distribution of the Shares as contemplated in this
Agreement and the Prospectus. If during the period in which a prospectus is
required by law to be delivered by an Underwriter or dealer, any event shall
occur as a result of which, in the judgment of the Company or in the reasonable
opinion of the Representatives or counsel for the Underwriters, it becomes
necessary to amend or


                                      -16-


<PAGE>


supplement the Prospectus in order to make the statements therein, in the light
of the circumstances existing at the time the Prospectus is delivered to a
purchaser, not misleading, or, if it is necessary at any time to amend or
supplement the Prospectus to comply with any law, the Company promptly will
prepare and file with the Commission, and furnish at its own expense to the
Underwriters and to dealers, an appropriate amendment to the Registration
Statement or supplement to the Prospectus so that the Prospectus as so amended
or supplemented will not, in the light of the circumstances when it is so
delivered, be misleading, or so that the Prospectus will comply with the law.

         (e) COPIES OF ANY AMENDMENTS AND SUPPLEMENTS TO THE PROSPECTUS. The
Company agrees to furnish the Representatives, without charge, during the period
beginning on the date hereof and ending on the later of the First Closing Date
or such date, as in the opinion of counsel for the Underwriters, the Prospectus
is no longer required by law to be delivered in connection with sales by an
Underwriter or dealer (the "Prospectus Delivery Period"), as many copies of the
Prospectus and any amendments and supplements thereto as the Representatives may
request.

         (f) INSURANCE. The Company shall obtain Directors and Officers
liability insurance in the minimum amount of $10.0 million which shall apply to
the offering contemplated hereby.

         (g) NOTICE OF SUBSEQUENT EVENTS. If at any time during the ninety (90)
day period after the Registration Statement becomes effective, any rumor,
publication or event relating to or affecting the Company shall occur as a
result of which in your opinion the market price of the Company Shares has been
or is likely to be materially affected (regardless of whether such rumor,
publication or event necessitates a supplement to or amendment of the
Prospectus), the Company will, after written notice from you advising the
Company to the effect set forth above, promptly prepare, consult with you
concerning the substance of and disseminate a press release or other public
statement, reasonably satisfactory to you, responding to or commenting on such
rumor, publication or event.

         (h) USE OF PROCEEDS. The Company shall apply the net proceeds from the
sale of the Shares sold by it in the manner described under the caption "Use of
Proceeds" in the Prospectus.

         (i) TRANSFER AGENT. The Company shall engage and maintain, at its
expense, a registrar and transfer agent for the Common Shares.

         (j) EARNINGS STATEMENT. AS soon as practicable, the Company will make
generally available to its security holders and to the Representatives an
earnings statement (which need not be audited) covering a period of at least 12
months beginning after the effective date of the Registration Statement that
satisfies the provisions of Section 11(a) of the Securities Act.

         (k) PERIODIC REPORTING OBLIGATIONS. During the Prospectus Delivery
Period the Company shall file, on a timely basis, with the Commission and the
Nasdaq National Market all reports and documents required to be filed under the
Exchange Act as required by the National Association of Security Dealers, LLC.


                                      -17-


<PAGE>


         (l) AGREEMENT NOT TO OFFER OR SELL ADDITIONAL SECURITIES. The
Company will not, without the prior written consent of FleetBoston Robertson
Stephens Inc., for a period of 90 days following the date of the Prospectus,
offer, sell or contract to sell, or otherwise dispose of or enter into any
transaction which is designed to, or could be expected to, result in the
disposition (whether by actual disposition or effective economic disposition
due to cash settlement or otherwise by the Company or any affiliate of the
Company or any person in privity with the Company or any affiliate of the
Company) directly or indirectly, or announce the offering of, any other
Common Shares or any securities convertible into, or exchangeable for, Common
Shares; PROVIDED, HOWEVER, that the Company may (i) issue and sell Common
Shares pursuant to any director or employee stock option plan, stock
ownership plan or dividend reinvestment plan of the Company in effect at the
date of the Prospectus and described in the Prospectus so long as at the time
of such issuance or sale, the Company already has or otherwise obtains a
Lock-Up Agreement in the form of Exhibit H from such holder providing that
none of those shares may be transferred on during the period of 90 days from
the date that the Registration Statement is declared effective (the "Lock-Up
Period") and the Company shall enter stop transfer instructions with its
transfer agent and registrar against the transfer of any such Common Shares,
(ii) the Company may issue the 5 3/4% Convertible Subordinated Notes due 2005
to be issued in a concurrent offering as described in the Prospectus and the
Common Shares issuable upon the conversion thereof, (iii) the Company may
issue Common Shares issuable upon the conversion of securities or the
exercise of warrants outstanding at the date of the Prospectus and described
in the Prospectus. Notwithstanding the foregoing, BancBoston Robertson
Stephens Inc. agrees it will not unreasonably withhold consent to the
issuance of equity securities in connection with an acquisition.

         (m) FUTURE REPORTS TO THE REPRESENTATIVES. During the period of three
years from the date hereof the Company will furnish to the Representatives (i)
as soon as practicable after the end of each fiscal year, copies of the Annual
Report of the Company containing the balance sheet of the Company as of the
close of such fiscal year and statements of income, stockholders' equity and
cash flows for the year then ended and the unqualified opinion thereon of the
Company's independent public or certified public accountants; (ii) as soon as
practicable after the filing thereof, copies of each proxy statement, Annual
Report on Form 10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K
or other report filed by the Company with the Commission, the National
Association of Securities Dealers, LLC or any securities exchange; and (iii) as
soon as available, copies of any report or communication of the Company mailed
generally to holders of its capital stock.

         B.  COVENANTS OF THE SELLING STOCKHOLDERS.

             Each Selling Stockholder, severally and jointly, further
covenants and agrees with each Underwriter:

         (a) AGREEMENT NOT TO OFFER OR SELL ADDITIONAL SECURITIES. Such Selling
Stockholder will not, during the Lock-Up Period, make a disposition of
Securities (as defined in EXHIBIT A hereto) now owned or hereafter acquired
directly by such person or with respect to which such person has or hereafter
acquires the power of disposition, otherwise than (i) as a bona fide gift or
gifts, provided the donee or donees thereof agree in writing to be bound by this
restriction, (ii) as


                                      -18-


<PAGE>


a distribution to partners or shareholders of such person, provided that the
distributees thereof agree in writing to be bound by the terms of this
restriction, (iii) with respect to dispositions of Common Shares acquired on the
open market or (iv) with the prior written consent of FleetBoston Robertson
Stephens Inc. The foregoing restriction has been expressly agreed to preclude
the holder of the Securities from engaging in any hedging or other transaction
which is designed to or reasonably expected to lead to or result in a
disposition of Securities during the Lock-Up Period, even if such Securities
would be disposed of by someone other than such holder. Such prohibited hedging
or other transactions would include, without limitation, any short sale (whether
or not against the box) or any purchase, sale or grant of any right (including,
without limitation, any put or call option) with respect to any Securities or
with respect to any security (other than a broad-based market basket or index)
that includes, relates to or derives any significant part of its value from
Securities. Furthermore, such person has also agreed and consented to the entry
of stop transfer instructions with the Company's transfer agent against the
transfer of the Securities held by such person except in compliance with this
restriction.

         (b) WAIVER OF REGISTRATION RIGHTS IN CONNECTION WITH THE REGISTRATIONS.
Such Selling Stockholder acknowledges that they are and continue to be subject
to the lock-up agreements that were entered into at the time of, or became
effective upon, the Company's initial public offering in November 1999, which
have been waived by the Representatives and the Company to the extent necessary
to permit the sale of the Selling Stockholder Shares pursuant to this Agreement.
Such Selling Stockholder hereby waives any notice requirements and any and all
rights such Selling Stockholder may have had under the First Amended and
Restated Registration Rights Agreement dated July 12, 1999 to include any shares
of Common Stock of such Selling Stockholder in the Registration Statement or the
registration statement for the Debt Offering. Such Selling Stockholder shall
provide any additional information or documents as reasonably requested by the
Company or the Representatives to further evidence the agreements and waivers
set forth in this Section 3(B)(b).

         (c) DELIVERY OF FORMS W-8 AND W-9. To deliver to the Representatives
prior to the First Closing Date a properly completed and executed United States
Treasury Department Form W-8 (if the Selling Stockholder is a non-United States
person) or Form W-9 (if the Selling Stockholder is a United States Person).

         (d) NOTIFICATION OF UNTRUE STATEMENTS, ETC. If, at any time prior to
the date on which the distribution of the Common Shares as contemplated herein
and in the Prospectus has been completed, as determined by the Representatives,
the Selling Stockholder has knowledge of the occurrence of any event as a result
of which the Prospectus or the Registration Statement, in each case as then
amended or supplemented, would include an untrue statement of a material fact or
omit to state any material fact necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading, such
Selling Stockholder will promptly notify the Company and the Representatives.

         SECTION 4. CONDITIONS OF THE OBLIGATIONS OF THE UNDERWRITERS. The
obligations of the several Underwriters to purchase and pay for the Shares as
provided herein on the First Closing Date and, with respect to the Option
Shares, the Second Closing Date, shall be subject to the accuracy of the
representations and warranties on the part of the Company and the Selling


                                      -19-


<PAGE>


Stockholders set forth in Section 1 hereof as of the date hereof and as of the
First Closing Date as though then made and, with respect to the Option Shares,
as of the Second Closing Date as though then made, to the timely performance by
the Company of its covenants and other obligations hereunder, and to each of the
following additional conditions:

         (a) COMPLIANCE WITH REGISTRATION REQUIREMENTS, NO STOP ORDER, NO
OBJECTION FROM THE NATIONAL ASSOCIATION OF SECURITIES DEALERS, LLC. The
Registration Statement shall have been declared effective prior to the execution
of this Agreement, or at such later date as shall be consented to in writing by
you; and no stop order suspending the effectiveness thereof shall have been
issued and no proceedings for that purpose shall have been initiated or, to the
knowledge of the Company or any Underwriter, threatened by the Commission, and
any request of the Commission for additional information (to be included in the
Registration Statement or the Prospectus or otherwise) shall have been complied
with to the satisfaction of Underwriters' Counsel; and the National Association
of Securities Dealers, LLC shall have raised no objection to the fairness and
reasonableness of the underwriting terms and arrangements.

         (b) CORPORATE PROCEEDINGS. All corporate proceedings and other legal
matters in connection with this Agreement, the Registration Statement and the
Prospectus, and the registration, authorization, issue, sale and delivery of the
Shares, shall have been in form and substance reasonably satisfactory to
Underwriters' Counsel, and such counsel shall have been furnished with such
papers and information as they may reasonably have requested to enable them to
pass upon the matters referred to in this Section 4.

         (c) NO MATERIAL ADVERSE CHANGE. Subsequent to the execution and
delivery of this Agreement and prior to the First Closing Date, or the Second
Closing Date, as the case may be, there shall not have been any Material Adverse
Change in the condition (financial or otherwise), earnings, operations, business
or prospects of the Company and its subsidiaries considered as one enterprise
from that described in the Registration Statement or Prospectus, which, in your
sole judgment, is material and adverse and that makes it, in your sole judgment,
impracticable or inadvisable to proceed with the public offering of the Shares
as contemplated by the Prospectus.

         (d) OPINION OF COUNSEL FOR THE COMPANY. You shall have received on the
First Closing Date and the Second Closing Date, as the case may be, an opinion
of Bingham Dana LLP counsel for the Company substantially in the form of EXHIBIT
C attached hereto, dated the First Closing Date or the Second Closing Date, as
the case may be, addressed to the Underwriters and with reproduced copies or
signed counterparts thereof for each of the Underwriters.

         (e) OPINION OF GOVERNMENT REGULATION COUNSEL FOR THE COMPANY. You shall
have received on the First Closing Date and the Second Closing Date, as the case
may be, an opinion of Swidler Berlin Sheroff Friedman, LLP, government
regulation counsel for the Company substantially in the form of EXHIBIT D
attached hereto.

         (f) OPINION OF COUNSEL FOR THE UNDERWRITERS. You shall have received on
the First Closing Date and the Second Closing Date, as the case may be, an
opinion of Alston & Bird LLP, substantially in the form of EXHIBIT E hereto. The
Company shall have furnished to such


                                      -20-


<PAGE>


counsel such documents as they may have requested for the purpose of enabling
them to pass upon such matters.

         (g) ACCOUNTANTS' COMFORT LETTER. You shall have received on the First
Closing Date and on the Second Closing Date, as the case may be, a letter from
Arthur Andersen LLP addressed to the Underwriters, dated the First Closing Date
or the Second Closing Date, as the case may be, confirming that they are
independent certified public accountants with respect to the Company within the
meaning of the Securities Act and the applicable published Rules and Regulations
and based upon the procedures described in such letter delivered to you
concurrently with the execution of this Agreement (herein called the "Original
Letter"), but carried out to a date not more than four (4) business days prior
to the First Closing Date or the Second Closing Date, as the case may be, (i)
confirming, to the extent true, that the statements and conclusions set forth in
the Original Letter are accurate as of the First Closing Date or the Second
Closing Date, as the case may be, and (ii) setting forth any revisions and
additions to the statements and conclusions set forth in the Original Letter
which are necessary to reflect any changes in the facts described in the
Original Letter since the date of such letter, or to reflect the availability of
more recent financial statements, data or information. The letter shall not
disclose any change in the condition (financial or otherwise), earnings,
operations, business or prospects of the Company and its subsidiaries considered
as one enterprise from that described in the Registration Statement or
Prospectus, which, in your sole judgment, is material and adverse and that makes
it, in your sole judgment, impracticable or inadvisable to proceed with the
public offering of the Shares as contemplated by the Prospectus. The Original
Letter from Arthur Andersen LLP shall be addressed to or for the use of the
Underwriters in form and substance satisfactory to the Underwriters and shall
(i) represent, to the extent true, that they are independent certified public
accountants with respect to the Company within the meaning of the Securities Act
and the applicable published Rules and Regulations, (ii) set forth their opinion
with respect to their examination of the consolidated balance sheet of the
Company as of December 31, 1998 and 1999 and related consolidated statements of
operations, shareholders' equity, and cash flows for the twelve (12) months
ended December 31, 1997, 1998 and 1999, , and (iii) address other matters agreed
upon by Arthur Andersen LLP and you. In addition, you shall have received from
Arthur Andersen LLP a letter addressed to the Company and made available to you
for the use of the Underwriters stating that their review of the Company's
system of internal accounting controls, to the extent they deemed necessary in
establishing the scope of their examination of the Company's consolidated
financial statements as of December 31, 1999, did not disclose any weaknesses in
internal controls that they considered to be material weaknesses.

         (h) OFFICERS' CERTIFICATE. You shall have received on the First Closing
Date and the Second Closing Date, as the case may be, a certificate of the
Company, dated the First Closing Date or the Second Closing Date, as the case
may be, signed by the Chief Executive Officer and Chief Financial Officer of the
Company, to the effect that, and you shall be satisfied that:

         (i) The representations and warranties of the Company in this Agreement
         are true and correct, as if made on and as of the First Closing Date or
         the Second Closing Date, as the case may be, and the Company has
         complied in all material respects with all the agreements and satisfied
         all the conditions on its part to be performed or satisfied at or prior
         to the First Closing Date or the Second Closing Date, as the case may
         be;


                                      -21-


<PAGE>


         (ii) No stop order suspending the effectiveness of the Registration
         Statement has been issued and no proceedings for that purpose have been
         instituted or are pending or threatened under the Securities Act;

         (iii) When the Registration Statement became effective and at all times
         subsequent thereto up to the delivery of such certificate, the
         Registration Statement and the Prospectus, and any amendments or
         supplements thereto, contained all material information required to be
         included therein by the Securities Act and in all material respects
         conformed to the requirements of the Securities Act, the Registration
         Statement and the Prospectus, and any amendments or supplements
         thereto, did not and does not include any untrue statement of a
         material fact or omit to state a material fact required to be stated
         therein or necessary to make the statements therein, in light of the
         circumstances under which they were made not misleading; and, since the
         effective date of the Registration Statement, there has occurred no
         event required to be set forth in an amended or supplemented Prospectus
         which has not been so set forth; and

         (iv) Subsequent to the respective dates as of which information is
         given in the Registration Statement and Prospectus, there has not been
         (a) any material adverse change in the condition (financial or
         otherwise), earnings, operations, business or prospects of the Company
         and its subsidiaries considered as one enterprise, (b) any transaction
         that is material to the Company and its subsidiaries considered as one
         enterprise, except transactions entered into in the ordinary course of
         business, (c) any obligation, direct or contingent, that is material to
         the Company and its subsidiaries considered as one enterprise, incurred
         by the Company or its subsidiaries, except obligations incurred in the
         ordinary course of business, (d) except as described in the Prospectus,
         any change in the capital stock or outstanding indebtedness of the
         Company or any of its subsidiaries that is material to the Company and
         its subsidiaries considered as one enterprise, (e) any dividend or
         distribution of any kind declared, paid or made on the capital stock of
         the Company or any of its subsidiaries, or (f) any loss or damage
         (whether or not insured) to the property of the Company or any of its
         subsidiaries which has been sustained or will have been sustained which
         has had or would reasonably be expected to have a material adverse
         effect on the condition (financial or otherwise), earnings, operations,
         business or prospects of the Company and its subsidiaries considered as
         one enterprise.

         (i) LOCK-UP AGREEMENT FROM CERTAIN STOCKHOLDERS OF THE COMPANY. The
Company shall have obtained and delivered to you an agreement in the form of
EXHIBIT F attached hereto from each officer and director of the Company, and
each beneficial owner of one or more percent of the outstanding issued share
capital of the Company (including holders of options to acquire the same).

         (j) OPINION OF COUNSEL FOR THE SELLING STOCKHOLDERS. You shall have
received on the First Closing Date and the Second Closing Date, as the case
may be, opinions of Bingham Dana LLP, special counsel for certain Selling
Stockholders, and opinions of counsel delivered by certain other Selling
Stockholders, in each case substantially in the form of EXHIBIT G attached
hereto, dated the First Closing Date or the Second Closing Date, as the case
may be, addressed to the

                                      -22-


<PAGE>


Underwriters and with reproduced copies or signed counterparts thereof for each
of the Underwriters.

         (k) SELLING STOCKHOLDER'S CERTIFICATE. On the First Closing Date and
the Second Closing Date, as the case may be, the Representatives shall have
received a written certificate executed by the Attorney-in-Fact of each Selling
Stockholders, dated as of the First Closing Date or the Second Closing Date, as
the case may be, to the effect that: (i) the representations, warranties and
covenants of such Selling Stockholder set forth in Section 1(B) of this
Agreement are true and correct with the same force and effect as though
expressly made by such Selling Stockholder on and as of such Closing Date; and
(ii) such Selling Stockholder has complied with all the agreements and satisfied
all the conditions on its part to be performed or satisfied at or prior to such
Closing Date.

         (l) SELLING STOCKHOLDER'S DOCUMENTS. At least three business days prior
to the date hereof, the Company and each Selling Stockholder shall have
furnished for review by the Representative copies of the Powers of Attorney and
Custody Agreements executed by the Selling Stockholders and such further
information, certificates and documents as the Representatives may reasonably
request.

         (m) STOCK EXCHANGE LISTING. The Shares shall have been approved for
quotation on the Nasdaq National Market, subject only to official notice of
issuance.

         (n) COMPLIANCE WITH PROSPECTUS DELIVERY REQUIREMENTS. The Company shall
have complied with the provisions of Section 3(e) hereof with respect to the
furnishing of Prospectuses.

         (o) ADDITIONAL DOCUMENTS. On or before each of the First Closing Date
and the Second Closing Date, as the case may be, the Representative and counsel
for the Underwriters shall have received such information, documents and
opinions as they may reasonably require for the purposes of enabling them to
pass upon the issuance and sale of the Shares as contemplated herein, or in
order to evidence the accuracy of any of the representations and warranties, or
the satisfaction of any of the conditions or agreements, herein contained.

         If any condition specified in this Section 4 is not satisfied when and
as required to be satisfied, this Agreement may be terminated by the
Representative by notice to the Company at any time on or prior to the First
Closing Date and, with respect to the Option Shares, at any time prior to the
Second Closing Date, which termination shall be without liability on the part of
any party to any other party, except that Section 5 (Payment of Expenses),
Section 6 (Reimbursement of Underwriters' Expenses), Section 7 (Indemnification
and Contribution) and Section 10 (Representations and Indemnities to Survive
Delivery) shall at all times be effective and shall survive such termination.

         SECTION 5. PAYMENT OF EXPENSES. The Company agrees to pay all costs,
fees and expenses incurred in connection with the performance of its obligations
hereunder and in connection with the transactions contemplated hereby,
including, without limitation, (i) all expenses incident to the issuance and
delivery of the Common Shares (including all printing and


                                      -23-


<PAGE>


engraving costs), (ii) all fees and expenses of the registrar and transfer agent
of the Common Stock, (iii) all necessary issue, transfer and other stamp taxes
in connection with the issuance and sale of the Shares to the Underwriters, (iv)
all fees and expenses of the Company's counsel, independent public or certified
public accountants and other advisors, (v) all costs and expenses incurred in
connection with the preparation, printing, filing, shipping and distribution of
the Registration Statement (including financial statements, exhibits, schedules,
consents and certificates of experts), each preliminary prospectus and the
Prospectus, and all amendments and supplements thereto, and this Agreement, (vi)
all filing fees, attorneys' fees and expenses incurred by the Company or the
Underwriters in connection with qualifying or registering (or obtaining
exemptions from the qualification or registration of) all or any part of the
Shares for offer and sale under the state securities or blue sky laws or the
provincial securities laws of Canada or any other country, and, if requested by
the Representatives, preparing and printing a "Blue Sky Survey," an
"International Blue Sky Survey" or other memorandum, and any supplements
thereto, advising the Underwriters of such qualifications, registrations and
exemptions, (vii) the filing fees incident to the National Association of
Securities Dealers, LLC review and approval of the Underwriters' participation
in the offering and distribution of the Common Shares, (viii) the fees and
expenses associated with obtaining approval for the quotation of the Shares on
the Nasdaq National Market, (ix) all reasonable costs and expenses incident to
the preparation and undertaking of "road show" presentations to be made to
prospective investors, and (x) all other fees, costs and expenses referred to in
Item 13 of Part II of the Registration Statement, PROVIDED, that in no event
shall the Company be required to pay in excess of $20,000 in respect of the fees
and expenses of Underwriter's counsel pursuant to this Section 5, or Section 5
of the Underwriting Agreement dated as of the date hereof relating to the
Company's concurrent public offering of Convertible Subordinated Notes due 2005.
Except as provided in this Section 5, Section 6, and Section 7 hereof, the
Underwriters shall pay their own expenses, including the fees and disbursements
of their counsel.

         The Selling Stockholders agree with each Underwriter to pay (directly
or by reimbursement) their pro rata share of all fees and expenses incident to
the performance of his, her or its obligations under this Agreement which are
not otherwise specifically provided for herein, including but not limited to (i)
fees and expenses of counsel and other advisors for such Selling Stockholder,
(ii) fees and expenses of the Custodian, and (iii) expenses and taxes incident
to the sale and delivery of the Common Shares to be sold by such Selling
Stockholder to the Underwriters hereunder (which taxes, if any, may be deducted
by the Custodian under the provisions of Section 2 of this Agreement).

         This Section 5 shall no affect or modify any separate, valid agreement
relating to the allocation of payment of expenses between the Company, on the
one hand, and the Selling Stockholders, on the other hand.

         SECTION 6. REIMBURSEMENT OF UNDERWRITERS' EXPENSES. If this Agreement
is terminated by the Representative pursuant to Section 4, Section 7, Section 8
or Section 9, or if the sale to the Underwriters of the Shares on the First
Closing Date is not consummated because of any refusal, inability or failure on
the part of the Company to perform any agreement herein or to comply with any
provision hereof, the Company agrees to reimburse the Representatives and the
other Underwriters (or such Underwriters as have terminated this Agreement with
respect to


                                      -24-


<PAGE>


themselves), severally, upon demand for all out-of-pocket expenses that shall
have been reasonably and actually incurred by the Representatives and the
Underwriters prior to the date of termination in connection with the proposed
purchase and the offering and sale of the Shares, including, without
limitations, to fees and disbursements of counsel, printing expenses, travel
expenses, postage, facsimile and telephone charges.

         SECTION 7.  INDEMNIFICATION AND CONTRIBUTION.

         (a) INDEMNIFICATION OF THE UNDERWRITERS.

         (1) The Company agrees to indemnify and hold harmless each Underwriter,
its officers and employees, and each person, if any, who controls any
Underwriter within the meaning of the Securities Act and the Exchange Act
against any loss, claim, damage, liability or expense, as incurred, to which
such Underwriter or such controlling per-son may become subject, under the
Securities Act, the Exchange Act or other federal or state statutory law or
regulation, or at common law or otherwise (including in settlement of any
litigation, if such settlement is effected with the written consent of the
Company, which consent shall not be unreasonably withheld or delayed), insofar
as such loss, claim, damage, liability or expense (or actions in respect thereof
as contemplated below) arises out of or is based (i) upon any untrue statement
or alleged untrue statement of a material fact contained in the Registration
Statement, or any amendment thereto, including any information deemed to be a
part thereof pursuant to Rule 430A or Rule 434 under the Securities Act, or the
omission or alleged omission therefrom of a material fact required to be stated
therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading; or (ii) upon any
untrue statement or alleged untrue statement of a material fact contained in any
preliminary prospectus or the Prospectus (or any amendment or supplement
thereto), or the omission or alleged omission therefrom of a material fact
necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading; or (iii) in whole or
in part upon any inaccuracy in the representations and warranties of the Company
contained herein; or (iv) in whole or in part upon any failure of the Company to
perform its obligations hereunder or under applicable law; or (v) any act or
failure to act or any alleged act or failure to act by any Underwriter in
connection with, or relating in any manner to, the Shares or the offering
contemplated hereby, and which is included as part of or referred to in any
loss, claim, damage, liability or action arising out of or based upon any matter
covered by clause (i), (ii), (iii) or (iv) above, provided that the Company
shall not be liable under this clause (v) to the extent that a court of
competent jurisdiction shall have determined by a final judgment that such loss,
claim, damage, liability or action resulted directly from any such acts or
failures to act undertaken or omitted to be taken by such Underwriter through
its bad faith or willful misconduct; and to reimburse each Underwriter and each
such controlling person for any and all expenses (including the reasonable fees
and disbursements of counsel chosen by FleetBoston Robertson Stephens Inc.) as
such expenses are reasonably incurred by such Underwriter or such controlling
person in connection with investigating, defending, settling, compromising or
paying any such loss, claim, damage, liability, expense or action; PROVIDED,
HOWEVER, that the foregoing indemnity agreement shall not apply to any loss,
claim, damage, liability or expense to the extent, but only to the extent,
arising out of or based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in reliance upon and in conformity with
written information furnished


                                      -25-


<PAGE>


to the Company by the Representatives expressly for use in the Registration
Statement, any preliminary prospectus or the Prospectus (or any amendment or
supplement thereto); and provided, further, that with respect to any preliminary
prospectus, the foregoing indemnity agreement shall not inure to the benefit of
any Underwriter from whom the person asserting any loss, claim, damage,
liability or expense purchased Shares, or any person controlling such
Underwriter, if copies of the Prospectus were timely delivered to the
Underwriter pursuant to Section 2 and a copy of the Prospectus. (as then amended
or supplemented if the Company shall have furnished any amendments or
supplements thereto) was not sent or given by or on behalf of such Underwriter
to such person, if required by law so to have been delivered, at or prior to the
written confirmation of the sale of the Shares to such person, and if the
Prospectus (as so amended or supplemented) would have cured the defect giving
rise to such loss, claim, damage, liability or expense. The indemnity agreement
set forth in this Section 7(a) shall be in addition to any liabilities that the
Company may otherwise have.

         (2) The Selling Stockholders, severally and not jointly, agree to
indemnify and hold harmless each Underwriter, its officers and employees, and
each person, if any, who controls any Underwriter within the meaning of the
Securities Act and the Exchange Act against any loss, claim, damage, liability
or expense, as incurred, to which such Underwriter or such controlling person
may become subject, under the Securities Act, the Exchange Act or other federal
or state statutory law or regulation, or at common law or otherwise (including
in settlement of any litigation, if such settlement is effected with the written
consent of the Company, which consent shall not be unreasonably withheld),
insofar as such loss, claim, damage, liability or expense (or actions in respect
thereof as contemplated below) arises out of or is based (i) upon any untrue
statement or alleged untrue statement of a material fact contained in the
Registration Statement, or any amendment thereto, including any information
deemed to be apart thereof pursuant to Rule 430A or Rule 434 under the
Securities Act, or the omission or alleged omission therefrom of a material fact
required to be stated therein or necessary to make the statements therein not
misleading; or (ii) upon any untrue statement or alleged untrue statement of a
material fact contained in any preliminary prospectus or the Prospectus (or any
amendment or supplement thereto), or the omission or alleged omission therefrom
of a material fact necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading, in the
case of subparagraphs (i) and (ii) of this Section 7(a)(2) to the extent, but
only to the extent, that such untrue statement or alleged untrue statement or
omission or alleged omission was made in reliance upon and in conformity with
written information furnished to the Company or such Underwriter by such Selling
Stockholder, directly or through such Selling Stockholder's representatives,
specifically for use in the preparation thereof; or (iii) in whole or in part
upon any inaccuracy in the representations and warranties of the Selling
Stockholder contained herein; or (iv) in whole or in part upon any failure of
the Selling Stockholder to perform its obligations hereunder or under law; or
(v) any act or failure to act or any alleged act or failure to act by any
Underwriter in connection with, or relating in any manner to, the Shares or the
offering contemplated hereby, and which is included as part of or referred to in
any loss, claim, damage, liability or action arising out of or based upon any
matter covered by clause (i), (ii), (iii) or (iv) above, provided that the
Selling Stockholder shall not be liable under this clause (v) to the extent that
a court of competent jurisdiction shall have determined by a final judgment that
such loss, claim, damage, liability or action resulted directly from any such
acts or failures to act undertaken or omitted to be taken by such


                                      -26-


<PAGE>


Underwriter through its bad faith or willful misconduct; and to reimburse each
Underwriter and each such controlling person for any and all expenses (including
the fees and disbursements of counsel chosen by FleetBoston Robertson Stephens
Inc.) as such expenses are reasonably incurred by such Underwriter or such
controlling person in connection with investigating, defending, settling,
compromising or paying any such loss, claim, damage, liability, expense or
action; provided, however, that the foregoing indemnity agreement shall not
apply to any loss, claim, damage, liability or expense to the extent, but only
to the extent, arising out of or based upon any untrue statement or alleged
untrue statement or omission or alleged omission made in reliance upon and in
conformity with written information furnished to the Selling Stockholder by the
Representatives expressly for use in the Registration Statement, any preliminary
prospectus or the Prospectus (or any amendment or supplement thereto); and
provided, further, that with respect to any preliminary prospectus, the
foregoing indemnity agreement shall not inure to the benefit of any Underwriter
from whom the person asserting any loss, claim, damage, liability or expense
purchased Shares, or any person controlling such Underwriter, if copies of the
Prospectus were timely delivered to the Underwriter pursuant to Section 2 and a
copy of the Prospectus (as then amended or supplemented if the Company shall
have furnished any amendments or supplements thereto) was not sent or given by
or on behalf of such Underwriter to such person, if required by law so to have
been delivered, at or prior to the written confirmation of the sale of the
Shares to such person, and if the Prospectus (as so amended or supplemented)
would have cured the defect giving rise to such loss, claim, damage, liability
or expense. The indemnity agreement set forth in this Section 7(a) shall be in
addition to any liabilities that the Selling Stockholders may otherwise have.

         (b) INDEMNIFICATION OF THE COMPANY, ITS DIRECTORS AND OFFICERS AND THE
SELLING STOCKHOLDERS. Each Underwriter agrees, severally and not jointly, to
indemnify and hold harmless the Company, each of its directors, each of its
officers who signed the Registration Statement, the Selling Stockholders and
each person, if any, who controls the Company or any of the Selling Stockholders
within the meaning of the Securities Act or the Exchange Act, against any loss,
claim, damage, liability or expense, as incurred, to which the Company, or any
such director, officer or controlling person may become subject, under the
Securities Act, the Exchange Act, or other federal or state statutory law or
regulation, or at common law or otherwise (including in settlement of any
litigation, if such settlement is effected with the written consent of such
Underwriter), insofar as such loss, claim, damage, liability or expense (or
actions in respect thereof as contemplated below) arises out of or is based (i)
upon any untrue or alleged untrue statement of a material fact contained in the
Registration Statement, any preliminary prospectus or the Prospectus (or any
amendment or supplement thereto), or arises out of or is based upon the omission
or alleged omission to state therein a material fact required to be stated
therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in the Registration
Statement, any preliminary prospectus, the Prospectus (or any amendment or
supplement thereto), in reliance upon and in conformity with written information
furnished to the Company and the Selling Stockholders by the Representatives
expressly for use therein and (ii) in whole or in part upon any failure of any
Underwriter to perform its obligations hereunder or under applicable law; and to
reimburse the Company, or any such director, officer, Selling Stockholder or
controlling person for any legal and other expense reasonably incurred by the


                                      -27-


<PAGE>


Company, or any such director, officer, Selling Stockholder or controlling
person in connection with investigating, defending, settling, compromising or
paying any such loss, claim, damage, liability, expense or action. The indemnity
agreement set forth in this Section 7(b) shall be in addition to any liabilities
that each Underwriter may otherwise have.

         (c) INFORMATION PROVIDED BY THE UNDERWRITERS. The Company and each of
the Selling Stockholders hereby acknowledge that the only information that the
Underwriters have furnished to the Company and the Selling Stockholders
expressly for use in the Registration Statement, any preliminary prospectus or
the Prospectus (or any amendment or supplement thereto) are the statements set
forth in the table in the first paragraph, the second paragraph, the third
paragraph and the tenth paragraph under the caption "Underwriting" in the
Prospectus; and the Underwriters confirm that such statements are true and
correct in all material respects.

         (d) NOTIFICATIONS AND OTHER INDEMNIFICATION PROCEDURES. Promptly after
receipt by an indemnified party under this Section 7 of notice of the
commencement of any action, such indemnified party will, if a claim in respect
thereof is to be made against an indemnifying party under this Section 7, notify
the indemnifying party in writing of the commencement thereof, but the omission
so to notify the indemnifying party will not relieve it from any liability which
it may have to any indemnified party for contribution or otherwise than under
the indemnity agreement contained in this Section 7 or to the extent it is not
prejudiced as a proximate result of such failure. In case any such action is
brought against any indemnified party and such indemnified party seeks or
intends to seek indemnity from an indemnifying party, the indemnifying party
will be entitled to participate in, and, to the extent that it shall elect,
jointly with all other indemnifying parties similarly notified, by written
notice delivered to the indemnified party promptly after receiving the aforesaid
notice from such indemnified party, to assume the defense thereof with counsel
reasonably satisfactory to such indemnified party; PROVIDED, HOWEVER, if the
defendants in any such action include both the indemnified party and the
indemnifying party and the indemnified party shall have reasonably concluded
that a conflict may arise between the positions of the indemnifying party and
the indemnified party in conducting the defense of any such action or that there
may be legal defenses available to it and/or other indemnified parties which are
different from or additional to those available to the indemnifying party, the
indemnified party or parties shall have the right to select separate counsel to
assume such legal defenses and to otherwise participate in the defense of such
action on behalf of such indemnified party or parties. Upon receipt of notice
from the indemnifying party to such indemnified party of such indemnifying
party's election so to assume the defense of such action and approval by the
indemnified party of counsel, the indemnifying party will not be liable to such
indemnified party under this Section 7 for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed separate counsel in
accordance with the proviso to the next preceding sentence (it being understood,
however, that the indemnifying party shall not be liable for the expenses of
more than one separate counsel (together with local counsel), approved by the
indemnifying party (FleetBoston Robertson Stephens Inc. in the case of Section
7(b) and Section 8), representing the indemnified parties who are parties to
such action), (ii) the indemnifying party shall not have employed counsel
satisfactory to the indemnified party to represent the indemnified party within
a reasonable time after notice of commencement of the action, or (iii) the
indemnifying party has authorized the employment of counsel for the


                                      -28-


<PAGE>


indemnified party at the expense of the indemnifying party, in each of which
cases the fees and expenses of counsel shall be at the expense of the
indemnifying party.

         (e) SETTLEMENTS. The indemnifying party under this Section 7 shall not
be liable for any settlement of any proceeding effected without its written
consent, which consent shall not be unreasonably withheld or delayed, but if
settled with such consent or if there be a final judgment for the plaintiff, the
indemnifying party agrees to indemnify the indemnified party against any loss,
claim, damage, liability or expense by reason of such settlement or judgment.
Notwithstanding the foregoing sentence, if at any time an indemnified party
shall have requested an indemnifying party to reimburse the indemnified party
for fees and expenses of counsel as contemplated by Section 7(d) hereof, the
indemnifying party agrees that it shall be liable for any settlement of any
proceeding effected without its written consent if (i) such settlement is
entered into more than 30 days after receipt by such indemnifying party of the
aforesaid request and (ii) such indemnifying party shall not have reimbursed the
indemnified party in accordance with such request prior to the date of such
settlement. No indemnifying party shall, without the prior written consent of
the indemnified party, effect any settlement, compromise or consent to the entry
of judgment in any pending or threatened action, suit or proceeding in respect
of which any indemnified party is or could have been a party and indemnity was
or could have been sought hereunder by such indemnified party, unless such
settlement, compromise or consent includes (i) an unconditional release of such
indemnified party from all liability on claims that are the subject matter of
such action, suit or proceeding and (ii) does not include a statement as to or
an admission of fault, culpability or a failure to act by or on behalf of any
indemnified party.

         (f) CONTRIBUTION. If the indemnification provided for in this Section 7
is unavailable to or insufficient to hold harmless an indemnified party under
Section 7(a) or (b) above in respect of any losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) then each
indemnifying party shall contribute to the aggregate amount paid or payable by
such indemnified party in such proportion as is appropriate to reflect the
relative benefits received by the Company and the Selling Stockholders on the
one hand and the Underwriters on the other from the offering of the Shares. If,
however, the allocation provided by the immediately preceding sentence is not
permitted by applicable law then each indemnifying party shall contribute to
such amount paid or payable by such indemnified party in such proportion as is
appropriate to reflect not only such relative benefits but also the relative
fault of the Company and the Selling Stockholders on the one hand and the
Underwriters on the other in connection with the statements or omissions which
resulted in such losses, claims, damages or liabilities, (or actions or
proceedings in respect thereof), as well as any other relevant equitable
considerations. The relative benefits received by the Company and the Selling
Stockholders on the one hand and the Underwriters on the other shall be deemed
to be in the same proportion as the total net proceeds from the offering (before
deducting expenses) received by the Company and the Selling Stockholders bears
to the total underwriting discounts and commissions received by the
Underwriters, in each case as set forth in the table on the cover page of the
Prospectus. The relative fault shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by the Company and the Selling Stockholders on the one hand or the
Underwriters on the other and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.


                                      -29-


<PAGE>


         The Company, Selling Stockholders and Underwriters agree that it would
not be just and equitable if contributions pursuant to this Section 7(f) were
determined by pro rata allocation (even if the Underwriters were treated as one
entity for such purpose) or by any other method of allocation which does not
take account of the equitable considerations referred to above in this Section
7(f). The amount paid or payable by an indemnified party as a result of the
losses, claims, damages or liabilities (or actions or proceedings in respect
thereof) referred to above in this Section 7(f) shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such action or claim.
Notwithstanding the provisions of this subsection (f), (i) no Underwriter shall
be required to contribute any amount in excess of the underwriting discounts and
commissions applicable to the Shares purchased by such Underwriter and (ii) no
person guilty of fraudulent misrepresentation (within the meaning of Section 11
(f) of the Securities Act) shall be entitled to contribution from any person who
was not guilty of such fraudulent misrepresentation. The Underwriters'
obligations in this Section 7(f) to contribute are several in proportion to
their respective underwriting obligations and not joint.

         (g) TIMING OF ANY PAYMENTS OF INDEMNIFICATION. Any losses, claims,
damages, liabilities or expenses for which an indemnified party is entitled to
indemnification or contribution under this Section 7 shall be paid by the
indemnifying party to the indemnified party as such losses, claims, damages,
liabilities or expenses are incurred, but in all cases, no later than thirty
(30) days of invoice to the indemnifying party.

         (h) SURVIVAL. The indemnity and contribution agreements contained in
this Section 7 and the representation and warranties of the Company set forth in
this Agreement shall remain operative and in full force and effect, regardless
of (i) any investigation made by or on behalf of any Underwriter or any person
controlling any Underwriter, the Company, its directors or officers, the Selling
Stockholders or any persons controlling the Company or a Selling Stockholder,
(ii) acceptance of any Shares and payment therefor hereunder, and (iii) any
termination of this Agreement. A successor to any Underwriter, or to the
Company, its directors or officers, the Selling Stockholders or any person
controlling the Company or a Selling Stockholder, shall be entitled to the
benefits of the indemnity, contribution and reimbursement agreements contained
in this Section 7.

         (i) ACKNOWLEDGEMENTS OF PARTIES. The parties to this Agreement hereby
acknowledge that they are sophisticated business persons who were represented by
counsel during the negotiations regarding the provisions hereof including,
without limitation, the provisions of this Section 7, and are fully informed
regarding said provisions. They further acknowledge that the provisions of this
Section 7 fairly allocate the risks in light of the ability of the parties to
investigate the Company and its business in order to assure that adequate
disclosure is made in the Registration Statement and Prospectus as required by
the Securities Act and the Exchange Act.

         SECTION 8. DEFAULT OF ONE OR MORE OF THE SEVERAL UNDERWRITERS. If, on
the First Closing Date or the Second Closing Date, as the case may be, any one
or more of the several Underwriters shall fail or refuse to purchase Shares that
it or they have agreed to purchase on


                                      -30-


<PAGE>


such date, and the aggregate number of Common Shares which such defaulting
Underwriter or Underwriters agreed but failed or refused to purchase does not
exceed 10% of the aggregate number of the Shares to be purchased on such date,
the other Underwriters shall be obligated, severally, in the proportions that
the number of Firm Common Shares set forth opposite their respective names on
SCHEDULE A bears to the aggregate number of Firm Shares set forth opposite the
names of all such non-defaulting Underwriters, or in such other proportions as
may be specified by the Representatives with the consent of the non-defaulting
Underwriters, to purchase the Shares which such defaulting Underwriter or
Underwriters agreed but failed or refused to purchase on such date. If, on the
First Closing Date or the Second Closing Date, as the case may be, any one or
more of the Underwriters shall fail or refuse to purchase Shares and the
aggregate number of Shares with respect to which such default occurs exceeds 10%
of the aggregate number of Shares to be purchased on such date, and arrangements
satisfactory to the Representatives and the Company for the purchase of such
Shares are not made within 48 hours after such default, this Agreement shall
terminate without liability of any party to any other party except that the
provisions of Section 4, and Section 7 shall at all times be effective and shall
survive such termination. In any such case either the Representatives or the
Company shall have the right to postpone the First Closing Date or the Second
Closing Date, as the case may be, but in no event for longer than seven days in
order that the required changes, if any, to the Registration Statement and the
Prospectus or any other documents or arrangements may be effected.

         As used in this Agreement, the term "Underwriter" shall be deemed to
include any person substituted for a defaulting Underwriter under this Section
8. Any action taken under this Section 8 shall not relieve any defaulting
Underwriter from liability in respect of any default of such Underwriter under
this Agreement.

         SECTION 9. TERMINATION OF THIS AGREEMENT. Prior to the First Closing
Date, this Agreement may be terminated by the Representatives by notice given to
the Company and the Selling Stockholders if at any time (i) trading or quotation
in any of the Company's securities shall have been suspended or limited by the
Commission or by the Nasdaq Stock Market, or trading in securities generally on
either the Nasdaq Stock Market or the New York Stock Exchange shall have been
suspended or limited, or minimum or maximum prices shall have been generally
established on any of such stock exchanges by the Commission or the NASD; (ii) a
general banking moratorium shall have been declared by any of federal, state, or
local authorities; (iii) there shall have occurred any outbreak or escalation of
national or international hostilities or any crisis or calamity, or any change
in the United States or international financial markets, or any substantial
change or development involving a prospective change in United States' or
international political, financial or economic conditions, as in the reasonable
judgment of the Representatives is material and adverse and makes it
impracticable or inadvisable to market the Common Shares in the manner and on
the terms described in the Prospectus or to enforce contracts for the sale of
securities; , (iv) in the reasonable judgment of the Representatives there shall
have occurred any Material Adverse Change; or (v) the Company shall have
sustained a loss by strike, fire, flood, earthquake, accident or other calamity
of such character as in the reasonable judgment of the Representatives may
interfere materially with the conduct of the business and operations of the
Company regardless of whether or not such loss shall have been insured. Any
termination pursuant to this Section 9 shall be without liability on


                                      -31-


<PAGE>


the part of (a) the Company or the Selling Stockholders to any Underwriter,
except that the Company and the Selling Stockholders shall be obligated to
reimburse the expenses of the Representatives and the Underwriters pursuant to
Sections 5 and 6 hereof, (b) any Underwriter to the Company or the Selling
Stockholders, or (c) of any party hereto to any other party except that the
provisions of Section 7 shall at all times be effective and shall survive such
termination.

         SECTION 10. REPRESENTATIONS AND INDEMNITIES TO SURVIVE DELIVERY. The
respective indemnities, agreements, representations, warranties and other
statements of the Company, of its officers and of the several Underwriters set
forth in or made pursuant to this Agreement will remain in full force and
effect, regardless of any investigation made by or on behalf of any Underwriter
or the Company or any of its or their respective partners, officers or directors
or any controlling person, as the case may be, and will survive delivery of and
payment for the Shares sold hereunder and any termination of this Agreement.

         SECTION 11. NOTICES. All communications hereunder shall be in writing
and shall be mailed, hand delivered or telecopied and confirmed to the parties
hereto as follows:

If to the Representatives:

         FLEETBOSTON ROBERTSON STEPHENS INC.
         555 California Street
         San Francisco, California 94104
         Facsimile: (415) 676-2696
         Attention: General Counsel

         Copy to:
         Alston & Bird LLP
         One Atlantic Center
         1201 West Peachtree Street
         Atlanta, Georgia 30309
         Facsimile: (404) 881-4777
         Attention: J. Vaughan Curtis, Esq.

If to the Company

         iBasis, Inc.
         20 Second Avenue
         Burlington, MA 01803
         Facsimile: 781-505-7300
         Attention: President


                                      -32-


<PAGE>


         Copy to:
         Bingham Dana LLP
         150 Federal Street
         Boston, MA 02110
         Facsimile: (617) 951-8736
         Attention: David L. Engel, Esq. and Johan V. Brigham, Esq.

If to the Selling Stockholders:

         iBasis, Inc.
         20 Second Avenue
         Burlington, MA 01803
         Facsimile: 781-505-7300
         Attention: Ofer Gneezy, Attorney-in-fact

         Copy to:
         Bingham Dana LLP
         150 Federal Street
         Boston, MA 02110
         Facsimile: (617) 951-8736
         Attention: David L. Engel, Esq. and Johan V. Brigham, Esq.

Any party hereto may change the address for receipt of communications by giving
written notice to the others.

         SECTION 12. SUCCESSORS. This Agreement will inure to the benefit of and
be binding upon the parties hereto, including any substitute Underwriters
pursuant to Section 9 hereof, and to the benefit of the employees, officers and
directors and controlling persons referred to in Section 7, and to their
respective successors, and no other person will have any right or obligation
hereunder. The term "successors" shall not include any purchaser of the Shares
as such from any of the Underwriters merely by reason of such purchase.

         SECTION 13. PARTIAL UNENFORCEABILITY. The invalidity or
unenforceability of any Section, paragraph or provision of this Agreement shall
not affect the validity or enforceability of any other Section, paragraph or
provision hereof. If any Section, paragraph or provision of this Agreement is
for any reason determined to be invalid or unenforceable, there shall be deemed
to be made such minor changes (and only such minor changes) as are necessary to
make it valid and enforceable.

         SECTION 14.  GOVERNING LAW PROVISIONS.

         (a) GOVERNING LAW. This agreement shall be governed by and construed in
accordance with the internal laws of the state of New York applicable to
agreements made and to be performed in such state.

         (b) CONSENT TO JURISDICTION. Any legal suit, action or proceeding
arising out of or based upon this Agreement or the transactions contemplated
hereby ("Related Proceedings") may


                                      -33-


<PAGE>


be instituted in the federal courts of the United States of America located in
the State of New York (collectively, the "Specified Courts"), and each party
irrevocably submits to the exclusive jurisdiction (except for proceedings
instituted in regard to the enforcement of a judgment of any such court (a
"Related Judgment"), as to which such jurisdiction is non-exclusive) of such
courts in any such suit, action or proceeding. Service of any process, summons,
notice or document by mail to such party's address set forth above shall be
effective service of process for any suit, action or other proceeding brought in
any such court. The parties irrevocably and unconditionally waive any objection
to the laying of venue of any suit, action or other proceeding in the Specified
Courts and irrevocably and unconditionally waive and agree not to plead or claim
in any such court that any such suit, action or other proceeding brought in any
such court has been brought in an inconvenient forum.

         (c) WAIVER OF IMMUNITY. With respect to any Related Proceeding, each
party irrevocably waives, to the fullest extent permitted by applicable law, all
immunity (whether on the basis of sovereignty or otherwise) from jurisdiction,
service of process, attachment (both before and after judgment) and execution to
which it might otherwise be entitled in the Specified Courts, and with respect
to any Related Judgment, each party waives any such immunity in the Specified
Courts or any other court of competent jurisdiction, and will not raise or claim
or cause to be pleaded any such immunity at or in respect of any such Related
Proceeding or Related Judgment, including, without limitation, any immunity
pursuant to the United States Foreign Sovereign Immunities Act of 1976, as
amended.

         SECTION 15. FAILURE OF A SELLING STOCKHOLDER TO SELL AND DELIVER
COMMON SHARES. If one or more of the Selling Stockholders shall fail to sell
and deliver to the Underwriters the Shares to be sold and delivered by such
Selling Stockholders at the First Closing Date or the Second Closing Date
pursuant to this Agreement, then the Company shall sell such number of Common
Shares as is equal to the number of Shares that such defaulting Selling
Stockholder had agreed to sell to the Underwriters hereunder. If one or more
of the Selling Stockholders shall fail to sell and deliver to the
Underwriters the Shares to be sold and delivered by such Selling Stockholders
pursuant to this Agreement at the First Closing Date, then the Underwriters
shall have the right, by written notice from the Representatives to the
Company and the Selling Stockholders, to postpone the First Closing Date, but
in no event for longer than seven days in order that the required changes, if
any, to the Registration Statement and the Prospectus or any other documents
or arrangements may be effected.

         SECTION 16. GENERAL PROVISIONS. This Agreement constitutes the entire
agreement of the parties to this Agreement and supersedes all prior written or
oral and all contemporaneous oral agreements, understandings and negotiations
with respect to the subject matter hereof. This Agreement may be executed in two
or more counterparts, each one of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.
This Agreement may not be amended or modified unless in writing by all of the
parties hereto, and no condition herein (express or implied) may be waived
unless waived in writing by each party whom the condition is meant to benefit.
The Table of Contents and the Section headings herein are for the convenience of
the parties only and shall not affect the construction or interpretation of this
Agreement.


                                      -34-


<PAGE>


         [The remainder of this page has been intentionally left blank.]






                                      -35-


<PAGE>


         If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Company the enclosed copies hereof,
whereupon this instrument, along with all counterparts hereof, shall become a
binding agreement in accordance with its terms.

                                                     Very truly yours,

                                                     IBASIS, INC.


                                                     By: /s/ Ofer Gneezy
                                                        ------------------------
                                                     Name: Ofer Gneezy
                                                     Title: President and CEO



                                                     THE SELLING STOCKHOLDERS
                                                     (severally and not jointly)


                                                     By: /s/ Ofer Gneezy
                                                        ------------------------
                                                     Name: Ofer Gneezy
                                                     Attorney-in-fact for the
                                                     Selling Stockholders



         The foregoing Underwriting Agreement is hereby confirmed and accepted
by the Representatives as of the date first above written.

FLEETBOSTON ROBERTSON STEPHENS INC.
CHASE SECURITIES INC.
U.S. BANCORP PIPER JAFFRAY INC.
DAIN RAUSCHER INCORPORATED




On their behalf and on behalf of each of the several underwriters named in
SCHEDULE A hereto.

BY:      FLEETBOSTON ROBERTSON STEPHENS INC.


By:      /s/ Mitchel Whitford
         ------------------------------------
         Authorized Signatory





                                      -36-


<PAGE>


                                    EXHIBIT A

                            Schedule of Underwriters

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------
Underwriter                                   Number of Firm Shares
                                                 to be Purchased

- -------------------------------------------------------------------------
<S>                                           <C>
FleetBoston Robertson Stephens Inc.               885,625
- -------------------------------------------------------------------------
Chase Securities Inc.                             885,625
- -------------------------------------------------------------------------
U.S. Bancorp. Piper Jaffrey Inc.                  885,625
- -------------------------------------------------------------------------
Dain Rauscher Incorporated                        593,125
- -------------------------------------------------------------------------
E*Offering                                        100,000
- -------------------------------------------------------------------------
HoaK Breedlove Wesneski & Co.                      75,000
- -------------------------------------------------------------------------
Kaufman Bros., L.P.                                75,000
- -------------------------------------------------------------------------
TOTAL UNDERWRITERS (__)                         3,500,000
- -------------------------------------------------------------------------
</TABLE>


                                      -37-


<PAGE>



                                    EXHIBIT B

                        Schedule of Selling Stockholders
<TABLE>
<CAPTION>
- -------------------------------------------------- ----------------------- ------------------------
                                                   Number of Firm Shares      Number of Option
Name and Address of Selling Stockholder                  to be Sold           Shares to be Sold
- -------------------------------------------------- ----------------------- ------------------------
<S>                                                <C>
- -------------------------------------------------- ----------------------- ------------------------

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

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

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

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

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

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

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

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

- -------------------------------------------------- ----------------------- ------------------------
</TABLE>


                                      -38-


<PAGE>



                                    EXHIBIT C

                       Opinion of Counsel for the Company


         (1) The Company has been duly incorporated and is validly existing as a
corporation in good standing under the DGCL.

         (2) The Company has the corporate power and authority to own, lease and
operate its properties and to conduct its business as described in the
Prospectus.

         (3) The Company is presently qualified to do business as a foreign
corporation in each jurisdiction within the United States in which it owns or
leases real property as described in the Registration Statement, except where
the failure to be so qualified would not have a Material Adverse Effect.

         (4) Immediately after the closing of the Offering, the authorized
capital stock of the Company will consist of (i) eighty-five million
(85,000,000) shares of common stock, $0.001 par value per share (the "COMMON
STOCK"), and (ii) fifteen million (15,000,000) shares of preferred stock, $0.001
par value per share, and there will be no shares of any other class of capital
stock authorized. All of the shares of Common Stock issued and outstanding
(including the Shares which may be sold by the Selling Stockholders) after the
closing of the Offering will have been duly authorized and validly issued and
will be fully paid and non-assessable. The shares of Common Stock issued and
outstanding after the closing of the Offering will not have been issued in
violation of, or subject to, any preemptive right, co-sale right, registration
right, right of first refusal or other similar right provided by (A) the
Restated Charter, the By-laws, or the DGCL, or (B), to our knowledge, any
agreement or instrument to which the Company is a party or by which the Company
is bound.

         (5) The Shares to be issued by the Company pursuant to the terms of the
Underwriting Agreement have been duly authorized and, upon issuance and delivery
against payment therefor in accordance with the terms thereof, will be duly and
validly issued and fully paid and nonassessable, and will not have been issued
in violation of or subject to any preemptive right, co-sale right, registration
right, right of first refusal or other similar right provided by (A) the
Restated Charter, the By-laws, or the DGCL, or (B), to our knowledge, any
agreement or instrument to which the Company is a party or by which the Company
is bound.

         (6) The Company has the corporate power and authority to enter into the
Underwriting Agreement and to issue, sell and deliver to the Underwriters the
Shares to be issued and sold by the Company thereunder.

         (7) The Underwriting Agreement has been duly authorized by all
necessary corporate action on the part of the Company and has been duly executed
and delivered by the Company and is a valid and binding agreement of the
Company, enforceable against the Company in accordance


                                      -39-


<PAGE>


with its terms (except that we express no opinion as to the enforceability of
the indemnification and contribution provisions of the Underwriting Agreement).

         (8) The Registration Statement has become effective under the Act and,
to our knowledge, no stop order suspending the effectiveness of the Registration
Statement has been issued and no proceedings for that purpose have been
instituted or are pending or threatened under the Act.

          (9) The Registration Statement and the Prospectus (other than the
financial statements (including supporting schedules) and financial data and
information and information derived therefrom, as to which we express no
opinion), as of the effective date of the Registration Statement, complied as to
form in all material respects with the requirements of the Act and the
applicable rules and regulations promulgated thereunder.

         (10) The information in the Prospectus under the caption "Description
of Capital Stock," to the extent that it constitutes matters of law or legal
conclusions, has been reviewed by us and is a fair summary of such matters and
conclusions, provided that no opinion is given as to the number of shares of
Common Stock or preferred stock outstanding. The form of the certificate
evidencing the Common Stock and filed as an exhibit to the Registration
Statement complies with the DGCL.

         (11) The description in the Registration Statement and the Prospectus
of the Restated Charter and the By-laws under the caption "Delaware Law and
Certain Certificate of Incorporation and By-Law Provisions," to the extent that
it constitutes matters of law or legal conclusions, is accurate in all material
respects and fairly presents the information with respect thereto required to be
presented by the Act.

         (12) To our knowledge, there are no agreements, contracts, leases or
documents to which the Company is a party of a character required to be
described or referred to in the Registration Statement or Prospectus or to be
filed as an exhibit to the Registration Statement which are not described or
referred to therein or filed as required.

         (13) The performance of the Underwriting Agreement and the consummation
of the transactions contemplated therein (other than performance of the
Company's indemnification obligations thereunder, concerning which no opinion is
expressed) will not (a) result in any violation of the Restated Charter or the
By-laws or (b) to our knowledge, result in a material breach or violation of any
of the terms and provisions of, or constitute a default under, any bond,
debenture, note or other evidence of indebtedness, or any lease, contract,
indenture, mortgage, deed of trust, loan agreement, joint venture or other
agreement or instrument known to us to which the Company is a party or by which
its properties are bound, or any applicable statute, rule or regulation known to
us or, to our knowledge, any order, writ or decree of any court, government or
governmental agency or body having jurisdiction over the Company or any of its
subsidiaries, or over any of their properties or operations (except that we
express no opinion as to the Company's performance of its obligations under the
indemnification and contribution provisions of the Underwriting Agreement, to
the extent such performance may be considered to violate securities laws or
public policy).


                                      -40-


<PAGE>


         (14) No consent, approval, authorization or order of or qualification
with any Federal or Massachusetts court, government or governmental agency or
body having jurisdiction over the Company or any of its subsidiaries, or over
any of their properties or operations is necessary in connection with the
consummation by the Company of the transactions contemplated under the
Underwriting Agreement, except (i) such as have been obtained under the Act or
the Exchange Act, (ii) such as may be required under state or other securities
or Blue Sky laws in connection with the purchase and the distribution of the
Shares by the Underwriters, or (iii) such as may be required by the National
Association of Securities Dealers, LLC.

         (15) To our knowledge, there are no legal or governmental proceedings
pending or overtly threatened against the Company or any of its subsidiaries of
a character required to be disclosed in the Registration Statement or the
Prospectus by the Act, other than those described therein.

         (16) To our knowledge, except as referred to in the Registration
Statement and Prospectus, no holders of any shares of Common Stock or other
securities of the Company have registration rights with respect to securities of
the Company and, except as referred to in the Registration Statement and
Prospectus, all holders of securities of the Company having rights known to us
to the registration of such shares of Common Stock or other securities because
of the filing of the Registration Statement by the Company have, with respect to
the offering contemplated thereby, waived such rights or such rights have
expired by reason of lapse of time following notification of the Company's
intent to file the Registration Statement.

         (17) The Company is not and, after giving effect to the offering and
the sale of the Shares and the application of the proceeds thereof as described
in the Prospectus, will not be, an "investment company" as such term is defined
in the Investment Company Act of 1940, as amended.

                                       ***

         In addition, we have participated in certain conferences with officers
and other representatives of the Company and representatives of the independent
accountants of the Company, at which conferences the contents of the
Registration Statement and Prospectus and related matters were discussed and,
although we do not assume any responsibility for the accuracy, completeness or
fairness of the statements contained in the Registration Statement or the
Prospectus, no facts have come to our attention that have caused us to believe
that, as of its effective date, the Registration Statement (other than the
financial statements and related schedules and other financial and statistical
data therein, as to which we express no view) contained an untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary to make the statements therein not misleading or that, as of its
date, the Prospectus (other than the financial statements and related schedules
and other financial and statistical data therein, as to which we express no
view) contained an untrue statement of a material fact or omitted to state a
material fact necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading or that, as of the date
hereof, as applicable, either the Registration Statement or the Prospectus
(other than the financial statements and related schedules and other financial
and statistical data therein, as to which we express no view) contains an untrue
statement of a material fact or omits to state a material fact


                                      -41-


<PAGE>


necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading.





                                      -42-


<PAGE>


                                    EXHIBIT D

            Opinion of Government Regulation Counsel For the Company

1. The statements in the Registration Statement under the captions "Risk Factors
- - Risk related to the Internet and Internet Telephony Industry" and "Business -
Government Regulation" (to the extent that the discussion in these sections
pertains to the Telecommunications Laws), insofar as such statements constitute
a summary of the legal matters, documents or proceedings pertaining to the
Companies, fairly summarize such matters referred to therein.



<PAGE>


                                    EXHIBIT E

                     Opinion of Counsel for the Underwriters

         1. The Shares to be issued by the Company have been duly authorized
and, upon issuance and delivery and payment therfor in accordance with the terms
of the Underwriting Agreement, will be validly issued, fully paid and
non-assessable.

         2. The Registration Statement complied as to form in all material
respects with the requirements of the Act; the Registration Statement has become
effective under the Act and, to our knowledge, no stop order proceedings with
respect thereto have been instituted or threatened or are pending under the Act.

         3. The Underwriting Agreement has been duly authorized, executed and
delivered by the Company and the Selling Stockholders.

         In connection with the preparation of the Registration Statement and
the Prospectus, we have participated in conferences with officers and
representatives of the Company, counsel for the Company and the independent
accountants of the Company, at which conferences we made inquiries of such
officers, representatives and others and discussed the contents of the
Registration Statement and the Prospectus. While the limitations inherent in the
independent verification of factual matters and the character of determinations
involved in the registration process are such that we are not passing upon and
do not assume any responsibility for the accuracy, completeness or fairness of
the statements contained in the Registration Statement or the Prospectus, based
on such participation, inquiries and discussion, no facts have come to our
attention that would lead us to believe that the Registration Statement (except
for financial statements, schedules, and other financial information contained
therein or omitted therefrom, as to which we express no belief) at the time it
became effective (but after giving effect to changes incorporated pursuant to
Rule 430A under the Act) contained any untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary to
make the statements therein not misleading, or that the Registration Statement,
the Prospectus and any amendment or supplement thereto (except for financial
statements, schedules and other financial information contained therein or
omitted therefrom, as to which we express no belief), as of the date thereof or
as of the date of this opinion, contained any untrue statement of a material
fact or omitted to state a material fact necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading.



<PAGE>


                                    EXHIBIT F




<PAGE>


                                    EXHIBIT G

                 Opinion of Counsel for the Selling Stockholders


                  (i) Each of the Underwriting Agreement and the Custody
Agreement has been duly authorized, executed and delivered on behalf of and
constitutes the valid and binding obligation of the Selling Stockholders
enforceable against each such Selling Stockholder in accordance with its terms
(except that we express no opinion as to the enforceability of the
indemnification and contribution provisions of the Underwriting Agreement).

                  (ii) To our knowledge, each Selling Stockholder has full legal
right, power and authority, and, to our knowledge, any approval required by law
(other than as required by state securities and blue sky laws as to which we
express no opinion) to sell, assign, transfer and deliver such Selling
Stockholder's Shares.

                  (iii) Assuming the Underwriters are protected purchasers, upon
delivery of the Shares of the Selling Stockholders against payment therefor as
provided in the Underwriting Agreement, good and marketable title to such
shares, free and clear of all liens, encumbrances, equities or claims, will be
transferred to the Underwriters who have purchased such Shares in good faith and
without notice of any such lien, encumbrance, equity or other adverse claim, as
that term is used and defined under Article 8 of the Uniform Commercial Code.




<PAGE>
                                                               Exhibit 1.2

                             Underwriting Agreement

                                  March 9, 2000

FleetBoston Robertson Stephens Inc.
Chase Securities, Inc.
U.S. Bancorp Piper Jaffray Inc.
Dain Rauscher Incorporated
As Representatives of the several Underwriters
c/o FleetBoston Robertson Stephens Inc.
555 California Street, Suite 2600
San Francisco, CA 94104

Ladies and Gentlemen:

     INTRODUCTORY. iBasis, Inc., a Delaware corporation (the "Company"),
proposes to issue and sell to the several underwriters named in SCHEDULE A
(the "Underwriters") $150,000,000 aggregate principal amount of its 5 3/4%
Convertible Subordinated Notes due 2005 (the "Firm Notes"). In addition, the
Company has granted to the Underwriters an option to purchase up to an
additional $22,500,000 aggregate principal amount of its 5 3/4% Convertible
Subordinated Notes due 2005 (the "Option Notes"), as provided in Section 2.
The Firm Notes and, if and to the extent such option is exercised, the Option
Notes, are collectively called the "Notes." The Notes are to be issued under
an Indenture dated as of March 15, 2000 (the "Indenture"), by and between the
Company and The Bank of New York, as trustee (the "Trustee"), pursuant to
which the Notes will be issued. The Notes will be convertible at the option
of the holders into the Company's Common Stock, par value $0.01 per share
(the "Common Stock"). The Notes and the shares of Common Stock into which the
Notes are convertible are referred to herein as the "Securities." FleetBoston
Robertson Stephens Inc., Chase Securities, Inc., U.S. Bancorp Piper Jaffray
Inc. and Dain Rauscher Incorporated have agreed to act as representatives of
the several Underwriters (in such capacity, the "Representatives,") in
connection with the offering and sale of the Notes.

     The Company has prepared and filed with the Securities and Exchange
Commission (the "Commission") a registration statement on Form S-1 (File No.
333-96533), which contains a form of prospectus to be used in connection with
the public offering and sale of the Notes. Such registration statement, as
amended, including the financial statements, exhibits and schedules thereto, in
the form in which it was declared effective by the Commission under the
Securities Act of 1933, as amended, and the rules and regulations promulgated
thereunder (collectively, the "Securities Act"), including any information
deemed to be a part thereof at the time of effectiveness pursuant to Rule 430A
or Rule 434 under the Securities Act, is called the "Registration Statement."
Any registration statement filed by the Company pursuant to Rule 462(b) under
the Securities Act is called the "Rule 462(b) Registration Statement," and from
and after the date and time of filing of the Rule 462(b) Registration Statement
the term "Registration Statement" shall include the Rule 462(b) Registration
Statement. Such prospectus, in the form

<PAGE>

first used by the Underwriter after effectiveness of the Registration
Statement to confirm sales of the Notes, is called the "Prospectus," PROVIDED,
HOWEVER, if the Company has, with the consent of FleetBoston Robertson Stephens
Inc., elected to rely upon Rule 434 under the Securities Act, the term
"Prospectus" shall mean the Company's prospectus subject to completion (each, a
"preliminary prospectus") dated February 22, 2000 (such preliminary prospectus
is called the "Rule 434 preliminary prospectus"), together with the applicable
term sheet (the "Term Sheet") prepared and filed by the Company with, the
Commission under Rules 434 and 424(b) under the Securities Act and all
references in this Agreement to the date of the Prospectus shall mean the date
of the Term Sheet. All references in this Agreement to the Registration
Statement, the Rule 462(b) Registration Statement, a preliminary prospectus, the
Prospectus or the Term Sheet, or any amendments or supplements to any of the
foregoing, shall include any copy thereof filed with the Commission pursuant to
its Electronic Data Gathering, Analysis and Retrieval System ("EDGAR").

     The Company hereby confirms its agreement with the Underwriters as follows:

SECTION 1. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

     The Company hereby represents, warrants and covenants to each Underwriter
as follows:

         (a) COMPLIANCE WITH REGISTRATION REQUIREMENTS. The Registration
Statement and any Rule 462(b) Registration Statement have been declared
effective by the Commission under the Securities Act. The Company has complied
with all requests of the Commission for additional or supplemental information.
No, stop order suspending the effectiveness of the Registration Statement or any
Rule 462(b) Registration Statement is in effect and no proceeding for such
purpose have been instituted or are pending or, to the knowledge of the Company,
are contemplated or threatened by the Commission.

         Each preliminary prospectus and the Prospectus when filed complied in
all material respects with the Securities Act and, if filed by electronic
transmission pursuant to EDGAR (except as may be permitted by Regulation S-T
under the Securities Act), was identical to the copy thereof delivered to the
Underwriters for use in connection with the offer and sale of the Notes. Each of
the Registration Statement, any Rule 462(b) Registration Statement and any
post-effective amendment thereto, at the time it became effective and at all
subsequent times, complied in all material respects with the Securities Act and
did not at the time the Registration Statement was declared effective, and will
not contain on the Closing Date and on any Second Closing date, any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein in the light of the
circumstances under which they were made, not misleading. The Prospectus, as
amended or supplemented, as of its date and at all subsequent times prior to and
including the Closing Date and any Second Closing Date, did not and will not on
the Closing Date or any Second Closing Date contain any untrue statement of a
material fact or omit to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading. The representations and warranties set forth in the two
immediately preceding sentences do not apply to statements in or omissions from
the Registration Statement, any Rule 462(b) Registration Statement, or any
post-effective amendment thereto, or the Prospectus, or

                                      -2-

<PAGE>

any amendments or supplements thereto, made in reliance upon and in conformity
with information relating to any Underwriter furnished to the Company in writing
by the Representative expressly for use therein. There are no contracts or other
documents required to be described in the Prospectus or to be filed as exhibits
to the Registration Statement which have not been described or filed as
required.

         (b) OFFERING MATERIALS FURNISHED TO UNDERWRITERS. The Company has
delivered to the Representatives three complete conformed copies of the
Registration Statement and of each consent and certificate of experts filed as a
part thereof, and conformed copies of the Registration Statement (without
exhibits) and preliminary prospectuses and the Prospectus, as amended or
supplemented, in such quantities and at such places as the Representatives have
reasonably requested for each of the Underwriters.

         (c) DISTRIBUTION OF OFFERING MATERIAL BY THE COMPANY. The Company has
not distributed and will not distribute, prior to the later of the Second
Closing Date (as defined below), if any, and the completion of the Underwriters'
distribution of the Notes, any offering material in connection with the offering
and sale of the Notes other than a preliminary prospectus, the Prospectus or the
Registration Statement.

         (d) THE UNDERWRITING AGREEMENT. This Agreement has been duly
authorized, executed and delivered by, and is a valid and binding agreement of,
the Company, enforceable against the Company in accordance with its terms,
except as rights to indemnification and contribution hereunder may be limited by
applicable law and public policy and except as the enforcement hereof may be
limited by bankruptcy, insolvency, reorganization, moratorium or other similar
laws relating to or affecting the rights and remedies of creditors or by general
equitable principles.

         (e) THE INDENTURE. The Company has all requisite corporate power and
authority to execute, deliver and perform its obligations under the Indenture.
The Indenture has been duly and validly authorized by the Company and, when duly
executed and delivered by the Company, and assuming the due authorization,
execution and delivery by the Trustee, will be the legal, valid and binding
obligation of the Company, enforceable against the Company in accordance with
its terms except as the enforceability thereof may be limited by the effect of
bankruptcy, insolvency, reorganization, moratorium or other similar laws
relating to or affecting the rights and remedies of creditors or by general
equitable principles. The Indenture meets the requirements for qualification
under the Trust Indenture Act of 1939, as amended (the "TIA") and at the First
Closing Date, the Indenture will have been qualified under the TIA. The
Indenture conforms in all material respects to the description thereof contained
in the Prospectus.

         (f) AUTHORIZATION OF THE NOTES. The Company has all requisite corporate
power and authority to execute, deliver and perform its obligations under the
Notes. The Notes, when issued, will be in the form contemplated by the
Indenture. The Notes to be purchased by the Underwriters from the Company have
been duly authorized for issuance and sale pursuant to this Agreement and, when
issued and authenticated in accordance with the terms of the Indenture and
delivered to and paid for by the Underwriters in accordance with the terms of
this Agreement, will be the legal, valid and binding obligations of the Company,
enforceable against the


                                   -3-

<PAGE>

Company in accordance with their terms and entitled to the benefits of the
Indenture except as the enforceability thereof may be limited by the effect of
bankruptcy, insolvency, reorganization, moratorium or other similar laws
relating to or affecting the rights and remedies of creditors or by general
equitable principles. The stockholders of the Company have no preemptive or
similar rights with respect to the Notes or the Common Stock issuable upon
conversion of the Notes.

         (g) AUTHORIZATION OF THE SHARES OF COMMON STOCK TO BE ISSUED UPON
CONVERSION OF THE NOTES. The Notes are convertible into shares of Common Stock
in accordance with the terms of the Indenture; the shares of Common Stock
initially issuable upon conversion of the Notes have been duly authorized and
reserved for issuance upon such conversion and, when issued upon such
conversion, will be validly issued, fully paid and nonassessable and will
conform to the description thereof contained in the Prospectus.

         (h) No APPLICABLE REGISTRATION OR OTHER SIMILAR RIGHTS. There are no
persons with registration or other similar rights to have any equity or debt
securities registered for sale under the Registration Statement or included in
the offering contemplated by this Agreement, except for such rights as have been
duly waived or have lapsed in accordance with their terms.

         (i) NO MATERIAL ADVERSE CHANGE. Subsequent to the respective dates as
of which information is given in the Prospectus: (i) there has been no material
adverse change, or any development that could reasonably be expected to result
in a material adverse change, in the condition, financial or otherwise, or in
the earnings, business, operations or prospects, whether or not arising from
transactions in the ordinary course of business, of the Company and its
subsidiaries, considered as one entity (any such change or effect, where the
context so requires, is called a "Material Adverse Change" or a "Material
Adverse Effect"); (ii) the Company and its subsidiaries, considered as one
entity, have not incurred any material liability or obligation, indirect, direct
or contingent, not in the ordinary course of business nor entered into any
material transaction or agreement not in the ordinary course of business; and
(iii) there has been no dividend or distribution of any kind declared, paid or
made by the Company or, except for dividends paid to the Company or other
subsidiaries, any of its subsidiaries on any class of capital stock or
repurchase or redemption by the Company or any of its subsidiaries of any class
of capital stock.

         (j) INDEPENDENT ACCOUNTANTS. Arthur Andersen LLP, who have expressed
their opinion with respect to the financial statements (which term as used in
this Agreement includes the related notes thereto) and supporting schedules
filed with the Commission as a part of the Registration Statement and included
in the Prospectus, are independent public or certified public accountants as
required by the Securities Act.

         (k) PREPARATION OF THE FINANCIAL STATEMENTS. The financial statements
filed with the Commission as a part of the Registration Statement and included
in the Prospectus present fairly the consolidated financial position of the
Company and its subsidiaries as of and at the dates indicated and the results of
their operations and cash flows for the periods specified. The supporting
schedules included in the Registration Statement present fairly the information
required to be stated therein. Such financial statements and supporting
schedules have been prepared in conformity with generally accepted accounting
principles as applied in the United

                                       -4-

<PAGE>

States, ("U.S. GAAP") applied on a consistent basis throughout the periods
involved, except as may be expressly stated in the related notes thereto. No
other financial statements or supporting schedules are required to be included
in the Registration Statement. The financial data set forth in the Prospectus
under the captions "Summary-Summary Consolidated Financial Data," "Selected
Consolidated Financial Data" and "Capitalization" fairly present the information
set forth therein on a basis consistent with that of the audited financial
statements contained in the Registration Statement other than the absence of
footnotes. The pro forma and pro forma as adjusted consolidated balance sheet
data of the Company and its subsidiaries and the related notes thereto included
under the caption "Summary--Summary Consolidated Financial Data," "Selected
Consolidated Financial Data" and elsewhere in the Prospectus and in the
Registration Statement present fairly the information contained therein, have
been prepared in accordance with the Commission's rules and guidelines with
respect to pro forma financial statements and have been properly presented on
the bases described therein, and the assumptions used in the preparation thereof
are reasonable and the adjustments used therein are appropriate to give effect
to the transactions and circumstances referred to therein. No other pro forma
financial information is required to be included in the Registration Statement
pursuant to Regulation S-X.

         (l) COMPANY'S ACCOUNTING SYSTEM. The Company and each of its
subsidiaries maintains a system of accounting controls sufficient to provide
reasonable assurances that (i) transactions are executed in accordance with
management's general or specific authorization; (ii) transactions recorded as
necessary to permit preparation of financial statements in conformity with U.S.
GAAP and to maintain accountability for assets; (iii) access to assets is
permitted only in accordance with management's general or specific
authorization; and (iv) the recorded accountability for assets is compared with
existing assets at reasonable intervals and appropriate action is taken with
respect to any differences.

         (m) SUBSIDIARIES OF THE COMPANY. The Company does not own or control,
directly or indirectly, any corporation, association or other entity other than
as listed in Exhibit 21.1 to the Registration Statement. The subsidiaries
considered in the aggregate as a single subsidiary, would not constitute a
"significant subsidiary," as defined in Rule 1-02(v) of Regulation S-X under the
Securities Act.

         (n) INCORPORATION AND GOOD STANDING OF THE COMPANY AND ITS
SUBSIDIARIES. Each of the Company and its subsidiaries has been duly organized
and is validly existing as a corporation or limited liability company, as the
case may be, in good standing under the laws of the jurisdiction in which it is
organized with full corporate power and authority to own its properties and
conduct its business as described in the Prospectus, and is duly qualified to do
business as a foreign corporation and is in good standing under the laws of each
jurisdiction which requires such qualification, except where the failure to be
so qualified will not have a Material Adverse Change.

         (o) CAPITALIZATION AND OTHER CAPITAL STOCK. The authorized, issued and
outstanding capital stock of the Company, upon consummation of the Closing, will
be as set forth in the Prospectus under the caption "Capitalization" (other than
for subsequent issuances, if any, pursuant to employee benefit plans described
in the Prospectus or upon exercise of outstanding options or warrants described
in the Prospectus), assuming no issuance of shares of Common

                                       -5-

<PAGE>

Stock in a concurrent public offering by the Company. The Notes and the Common
Stock conform in all material respects to the description thereof contained in
the Prospectus. All of the issued and outstanding Common Stock has been duly
authorized and validly issued, fully paid and nonassessable and will have been
issued in compliance with federal and state securities laws. None of the
outstanding Common Stock has been issued in violation of any preemptive rights,
rights of first refusal or other similar rights to subscribe for or purchase
securities of the Company. There are no authorized or outstanding options,
warrants, preemptive rights, rights of first refusal or other rights to purchase
or equity or debt securities convertible into or exchangeable or exercisable
for, any capital stock of the Company or any of its subsidiaries other than
those accurately and completely described in the Prospectus. The description of
the Company's stock option, stock bonus and other stock plans or arrangements,
and the options or other rights granted thereunder, set forth in the Prospectus
accurately and completely presents the information required to be shown with
respect to such plans, arrangements, options and rights.

         (p) CAPITALIZATION OF THE SUBSIDIARIES. All of the outstanding shares
of capital stock of each subsidiary have been duly and validly authorized and
issued and are fully paid and nonassessable, and, except as otherwise disclosed
in the Prospectus, all outstanding shares of capital stock of the subsidiaries
are owned by the Company, either directly or through its wholly-owned
subsidiaries, free and clear of any security interests, claims, liens or
encumbrances.

         (q) NO PROHIBITION ON SUBSIDIARIES FROM PAYING DIVIDENDS OR MAKING
OTHER DISTRIBUTIONS. No subsidiary of the Company is currently prohibited,
directly or indirectly, from paying any dividends to the Company, from making
any other distribution on such subsidiary's capital stock, from repaying to the
Company any loans or advances to such subsidiary from the Company or from
transferring any of such subsidiary's property or assets to the Company or any
other subsidiary of the Company, except as described in or contemplated by the
Prospectus, restrictions under securities laws, and except as such restrictions
would not have a Material Adverse Effect.

         (r) STOCK EXCHANGE LISTING. The shares of common stock issuable upon
conversion of the Notes have been registered pursuant to Section 12(g) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act") and are
approved for quotation on the Nasdaq National Market, subject only to official
notice of issuance. The Company has taken no action designed to, or likely to
have the effect of, terminating the registration of the Common Stock under the
Exchange Act or delisting the Common Stock from the Nasdaq National Market, nor
has the Company received any notification from the Commission or the National
Association of Securities Dealers, LLC (the "NASD") is contemplating terminating
such registration or listing.

         (s) NO CONSENTS, APPROVALS OR AUTHORIZATIONS REQUIRED. No consent,
approval, authorization, filing with or order of any court or governmental
agency or regulatory body is required in connection with the transactions
contemplated herein, except such as have been obtained or made under the
Securities Act and such as may be required (i) under the blue sky laws of any
jurisdiction in connection with the purchase and distribution of the Notes by
the Underwriters in the manner contemplated here and in the Prospectus, (ii) by
the NASD and (iii) by the federal and provincial law of Canada.

                                      -6-

<PAGE>

         (t) NON-CONTRAVENTION OF EXISTING INSTRUMENTS AGREEMENTS. Neither the
issuance and sale of the Notes, the issuance of the Common Stock upon conversion
of the Notes, nor the consummation any other of the transactions contemplated
herein or in the Indenture, nor the fulfillment of the terms hereof or thereof
will conflict with, result in a breach or Violation or imposition of any lien,
charge or encumbrance upon any property or assets of the Company or any of its
subsidiaries pursuant to, (i) the charter or by-laws of the Company or any of
its subsidiaries, (ii) the terms of any indenture, contract, lease, mortgage,
deed of trust, note agreement, loan agreement or other agreement, obligation,
condition, covenant or instrument to which the Company or any of its
subsidiaries is a party or bound or to which its or their property is subject or
(iii) any statute, law, rule, regulation, judgment, order or decree applicable
to the Company or any of its subsidiaries of any court, regulatory body,
administrative agency, governmental body, arbitrator or other authority having
jurisdiction over the Company or any of its subsidiaries or any of its or their
respective properties.

         (u) NO DEFAULTS OR VIOLATIONS. Neither the Company nor any subsidiary
is in violation or default of (i) any provision of its charter or by-laws, (ii)
the terms of any indenture, contract, lease, mortgage, deed of trust, note
agreement, loan agreement or other agreement, obligation, condition, covenant or
instrument to which it is a party or bound or to which its property is subject
or (iii) any statute, law, rule, regulation, judgment, order or decree of any
court; regulatory body, administrative agency, governmental body, arbitrator or
other authority having jurisdiction over the Company or such subsidiary or any
of their respective properties, as applicable, except any such violation or
default which would not, singly or in the aggregate, result in a Material
Adverse Change or except as otherwise disclosed in the Prospectus.

         (v) NO ACTIONS, SUITS OR PROCEEDINGS. No action, suit or proceeding by
or before any court or governmental agency, authority or body or any arbitrator
involving the Company or any of its subsidiaries or its or their respective
properties is pending or, to the knowledge of the Company, threatened that (i)
could reasonably be expected to have a Material Adverse Effect on the
performance of this Agreement or the consummation of any of the transactions
contemplated hereby or (ii) could reasonably be expected to result in a Material
Adverse Effect.

         (w) ALL NECESSARY PERMITS, ETC. The Company and each subsidiary possess
such valid and current certificates, authorizations or permits issued by the
appropriate federal, state, local or foreign regulatory agencies or bodies
necessary to conduct their respective businesses, and neither the Company nor
any subsidiary has received any notice of proceedings relating to the revocation
or modification of, or non-compliance with, any such certificate, authorization
or permit which singly or in the aggregate, if the subject of an unfavorable
decision, ruling or finding, could reasonably be expected to result in a
Material Adverse Change.

         (x) TITLE TO PROPERTIES. The Company and each of its subsidiaries has
good and marketable title to all the properties and assets reflected as owned in
the financial statements referred to in Section 1(i) above (or elsewhere in the
Prospectus), in each case free and clear of any security interests, mortgages,
liens, encumbrances, equities, claims and other defects, except such as do not
materially and adversely affect the value of such property and do not materially
interfere with the use made or proposed to be made of such property by the
Company or such subsidiary. The real property, improvements, equipment and
personal property held under lease

                                      -7-



<PAGE>

by the Company or any subsidiary are held under leases, with such exceptions, if
any, as are not material and do not materially interfere with the use made or
proposed to be made of such real property, improvements, equipment or personal
property by the Company or such subsidiary.

         (y) TAX LAW COMPLIANCE. The Company and its consolidated subsidiaries
have filed all necessary federal, state, local and foreign income and franchise
tax returns or have properly requested extensions thereto and have paid all
taxes required to be paid by any of them and, if due and payable, any related or
similar assessment, fine or penalty levied against any of them except as may be
being contested in good faith and by appropriate proceedings. The Company has
made adequate charges, accruals and reserves in the applicable financial
statements referred to in Section 1(i) above in respect of all federal, state,
local and foreign income and franchise taxes for all periods as to which the tax
liability of the Company of its consolidated subsidiaries has not been finally
determined. The Company is not aware of any tax deficiency that has been or
might be asserted or threatened against the Company that could result in a
Material Adverse Change.

         (z) INTELLECTUAL PROPERTY RIGHTS. Each of the Company and its
subsidiaries owns or possesses legally enforceable rights to use all patents,
patent rights or licenses, inventions, collaborative research agreements, trade
secrets, know-how, trademarks, service marks, trade names and copyrights which
are necessary to conduct its businesses as described in the Registration
Statement and Prospectus; the expiration of any patents, patent rights, trade
secrets trademarks, service marks, trade names or copyrights would not result in
a Material Adverse Change that is not otherwise accurately and completely
described in the Prospectus; the Company has not received any notice of, and has
no knowledge of any infringement of or conflict with asserted rights of the
Company by others with respect to any patent, patent rights, inventions, trade
secrets, know-how, trademarks, service marks, trade names or copyrights; and the
Company has not received any notice of, and has no knowledge of, any
infringement of or conflict with asserted rights of others with respect to any
patent, patent rights, inventions, trade secrets, know-how, trademarks, service
marks, trade names or copyrights which, singly or in the aggregate, if the
subject of an unfavorable decision, ruling or finding, could reasonably be
expected to result in a Material Adverse Change. There is no claim being made
against the Company regarding patents, patent trademarks, service marks, trade
names or copyright that could reasonably be expected to result in a Material
Adverse Effect. The Company and its subsidiaries do not in the conduct of their
business as now conducted and as proposed to be conducted as described in the
Prospectus infringe or conflict with any right or patent of any third party, or
any discovery, invention, product or process which is the subject of a patent
application filed by any third party, known to the Company or any of its
subsidiaries, which such infringement or conflict could reasonably be expected
to result in a Material Adverse Change.

         (aa) YEAR 2000 PREPAREDNESS. There are no issues related to the
Company's, or any of its subsidiaries', preparedness for the Year 2000 that
(i) are of a character required to be described or referred to in the
Registration Statement or Prospectus by the Securities Act which have not
been accurately and completely described in the Registration Statement or
Prospectus or (ii) could reasonably be expected to result in any Material
Adverse Change or that might materially affect the properties, assets or
rights of the Company or any of its Subsidiaries. All internal computer
systems and each Constituent Component (as defined below) of those systems

                                      -8-

<PAGE>

and all computer-related products and each Constituent Component of those
products of the Company and each of its subsidiaries fully comply with Year 2000
Qualification Requirements. For purposes of this Agreement, "Year 2000
Qualifications Requirements" means that the internal computer systems and each
Constituent Component (as defined below) of those systems and all
computer-related products and each Constituent Component (as defined below) of
those products of the Company and each of its Subsidiaries (i) have been
reviewed to confirm that they store, process (including sorting and performing
mathematical operations, calculations and computations), input and output data
containing date and information correctly regardless of whether the date
contains dates and times before, on or after January 1, 2000, (ii) have been
designated to ensure date and time entry recognition and calculations, and date
data interface values that reflect the century, (iii) accurately manage and
manipulate data involving dates and times, including single century formulas and
multi-century formulas, and will not cause an abnormal ending scenario within
the application or generate incorrect values or invalid results involving such
dates, (iv) accurately process any date rollover, and (v) accept and respond to
two-digit year date input in a manner that resolves any ambiguities as to the
century. For purposes of this Agreement, "Constituent Component" means all
software (including operating systems, programs, packages and utilities),
firmware, hardware, networking components, and peripherals provided as part of
the configuration. The Company has inquired of material vendors as to their
preparedness for the Year 2000 and has disclosed in the Registration Statement
or Prospectus any issues relating to such material vendors and known to the
Company that could reasonably be expected to result in any Material Adverse
Change.

         (bb) NO TRANSFER TAXES OR OTHER FEES. There are no transfer taxes or
other similar fees or charges under federal, state, local or foreign laws
required to be paid in connection with the execution and delivery of this
Agreement or the issuance and sale by the Company of the Notes.

         (cc) COMPANY NOT AN "INVESTMENT COMPANY". The Company has been advised
of the rules and requirements under the Investment Company Act of 1940, as
amended (the "Investment Company Act"). The Company is not, and after receipt of
payment for the Notes will not be, an "investment company" or an entity
"controlled" by an "investment company" within the meaning of the Investment
Company Act and will conduct its business in a manner so that it will not become
subject to the Investment Company Act.

         (dd) INSURANCE. Except as otherwise accurately and completely described
in the Prospectus, each of the Company and its subsidiaries is insured by
recognized, financially sound and reputable institutions with policies in such
amounts and with such deductibles and covering such risks as are generally
deemed adequate and customary for their businesses including, but not limited
to, policies covering real and personal property owned or leased by the Company
and its subsidiaries against theft, damage, destruction, acts of vandalism and
earthquakes, general liability and Directors and Officers liability. The Company
has no reason to believe that it or any subsidiary will not be able (i) to renew
its existing insurance coverage as and when such policies expire or (ii) to
obtain comparable coverage from similar institutions as may be necessary or
appropriate to conduct its business as now conducted and at a cost that would
not result in a Material Adverse Change. Neither of the Company nor any
subsidiary has been denied any insurance coverage which it has sought or for
which it has applied.

                                      -9-

<PAGE>

         (ee) LABOR MATTERS. To the Company's knowledge, no labor disturbance by
the employees of the Company or any of its subsidiaries exists or is imminent;
and the Company is not aware of any existing or imminent labor disturbance by
the employees of any of its principal suppliers that could reasonably be
expected to result in a Material Adverse Change.

         (ff) NO PRICE STABILIZATION OR MANIPULATION. The Company and, to its
knowledge, each of its directors and officers, has not taken and will not take,
directly or indirectly, any action designed to or that could reasonably be
expected to cause or result in stabilization or manipulation of the price of the
Common Stock to facilitate the sale or resale of the Notes.

         (gg) LOCK-UP AGREEMENTS. Each officer and director of the company and
each beneficial owner of one or more percent of the outstanding issued share
capital of the Company (or option to acquire the same) has signed an agreement
in the form attached hereto as EXHIBIT A (the "Lock-up Agreements"). The Company
has provided to counsel for the Underwriters a complete and accurate list of all
securityholders of the Company and the number and type of securities held by
each securityholder. The Company has provided to counsel for the Underwriters
true, accurate and complete copies of all of the Lock-up Agreements presently in
effect or effected hereby. The Company hereby represents and warrants that it
will not release any of its officers, directors or other stockholders from any
Lock-up Agreements currently existing or hereafter effected without the prior
written consent of FleetBoston Robertson Stephens Inc.

         (hh) RELATED PARTY TRANSACTIONS. There are no business relationships or
related-party transactions involving the Company or any subsidiary or any other
person required to be described in the Prospectus which have not been accurately
and completely described.

         (ii) NO UNLAWFUL CONTRIBUTIONS OR OTHER PAYMENTS. Neither the Company
nor any of its subsidiaries nor, to the Company's knowledge, any employee or
agent of the Company or any subsidiary, has made any contribution or other
payment to any official of, or candidate for, any federal, state or foreign
office in violation of any law or of the character required to be disclosed in
the Prospectus.

         (jj) ENVIRONMENTAL LAWS. (i) The Company is in compliance with all
rules, laws and regulations relating to the use, treatment, storage and disposal
of toxic substances and protection of health or the environment ("Environmental
Laws") which are applicable to its business, except where the failure to comply
would not result in a Material Adverse Change, (ii) the Company has received no
notice from any governmental authority or third party of an asserted claim under
Environmental Laws, which claim is required to be disclosed in the Registration
Statement and the Prospectus, (iii) the Company will not be required to make
future material capital expenditures to comply with Environmental Laws and (iv)
no property which is owned, leased or occupied by the Company has been
designated as a Superfund site pursuant to the Comprehensive Response,
Compensation, and Liability Act of 1980, as amended (42 U.S.C. Section 9601, ET
SEQ.), or otherwise designated as a contaminated site under applicable state or
local law.

                                      -10-

<PAGE>

         (kk) ERISA COMPLIANCE. The Company and its subsidiaries and any
"employee benefit plan" (as defined under the Employee Retirement Income
Security Act of 1974, as amended, and the regulations and published
interpretations thereunder (collectively, "ERISA")) established or maintained by
the Company, its subsidiaries or their "ERISA Affiliates" (as defined below) are
in compliance in all material respects with ERISA. "ERISA Affiliate" means, with
respect to the Company or a subsidiary, any member of any group of organizations
described in Sections 414(b), (c), (m) or (o) of the Internal Revenue Code of
1986, as amended, and the regulations and published interpretations thereunder
(the "Code") of which the Company or such subsidiary is a member. No "reportable
event" (as defined under ERISA) has occurred or is reasonably expected to occur
with respect to any "employee benefit plan" established or maintained by the
Company, its subsidiaries or any of their ERISA Affiliates. No "employee benefit
plan" established or maintained by the Company, its subsidiaries or any of their
ERISA Affiliates, if such "employee benefit plan" were terminated, would have
any "amount of unfounded benefit liabilities" (as defined under ERISA). Neither
the Company, its subsidiaries nor any of their ERISA Affiliates has incurred or
reasonably expects to incur any liability under (i) Title IV of ERISA with
respect to termination of, or withdrawal from, any "employee benefit plan" or
(ii) Sections 412, 4971, 4975 or 4980B of the Code. Each "employee benefit plan"
established or maintained by the Company, its subsidiaries or any of their ERISA
Affiliates that is intended to be qualified under Section 401(a) of the Code is
so qualified and nothing has occurred, whether by action or failure to act,
which would cause the loss of such qualification.

         (ll)     EXCHANGE ACT REPORTS FILED.  The Company has filed all reports
required to be filed pursuant to the Securities Act and the Exchange Act.

         (mm) FEDERAL RESERVE SYSTEM COMPLIANCE. Neither the Company nor any
agent acting on its behalf has taken, and none of them will take, any action
that might cause this Agreement or the issuance or sale of the Securities to
violate Regulation G (12 C.F.R. Part 207), Regulation T (12 C.F.R. Part 220),
Regulation U (12 C.F.R. Part 221) or Regulation X (12 C.F.R. Part 224) of the
Board of Governors of the Federal Reserve System or analogous foreign laws and
regulations.

         Any certificate signed by an executive officer of the Company and
delivered to the Representative or to counsel for the Underwriters at the
closing of any sale of the Notes shall be deemed to be a representation and
warranty by the Company to each Underwriter as to the matters set forth therein.

         SECTION 2.  PURCHASE, SALE AND DELIVERY OF THE NOTES.

         (a) THE FIRM NOTES. On the basis of the representations, warranties and
agreements herein contained, and upon the terms but subject to the conditions
herein set forth, the Company agrees to issue and sell to the Underwriters, and
each Underwriter agrees, severally and not jointly, to purchase from the
Company, at a purchase price of [97]% of the principal amount thereof (the
"Purchase Price"), the Firm Notes in the respective principal amount of Firm
Notes as hereinafter set forth. The obligation of each Underwriter to the
Company shall be to purchase from the Company that aggregate principal amount of
Firm Notes which is set forth opposite the name of such Underwriter set forth on
Schedule A.

                                      -11-

<PAGE>

         (b) THE FIRST CLOSING DATE. Delivery of the Firm Notes to be purchased
by the Underwriters and payment therefor shall be made by the Company and the
Representatives at 6:00 a.m. San Francisco time, at the New York, New York
offices of Bingham Dana LLP (or at such other place as may be agreed upon among
the Representatives and the Company), (i) on the third (3rd) full business day
following the first day that Notes are traded, (ii) if this Agreement is
executed and delivered after 1:30 P.M., San Francisco time, the fourth (4th)
full business day following the day that this Agreement is executed and
delivered or (iii) at such other time and date not later that seven (7) full
business days following the first day that Notes are traded as the
Representative and the Company may determine (or at such time and date to which
payment and delivery shall have been postponed pursuant to Section 8 hereof),
such time and date of payment and delivery being herein called the "Closing
Date;" PROVIDED, HOWEVER, that if the Company has not made available to the
Representatives copies of the Prospectus within the time provided in Section
4(d) hereof, the Representative may, in its sole discretion, postpone the
Closing Date until no later that two (2) full business days following delivery
of copies of the Prospectus to the Representative. The Firm Notes to be so
delivered will be made available to you at such office or such other location
including, without limitation, in New York, New York, as you may reasonably
request for checking at least one (1) full business day prior to the Closing
Date and will be in such names and denominations as you may request, such
request to be made at least two (2) full business days prior to the Closing
Date. If the Representatives so elect, delivery of the Firm Notes may be made by
credit through full fast transfer to the accounts at the Depository Trust
Company designated by the Representatives.

         (c) THE OPTION NOTES; THE SECOND CLOSING DATE. In addition, on the
basis of the representations, warranties and agreements herein contained, and
upon the terms but subject to the conditions herein set forth, the Company
hereby grants an option to the several Underwriters to purchase, severally and
not jointly, up to an aggregate of $22,500,000 principal amount of Option Notes
from the Company at the Purchase Price. The option granted hereunder is for use
by the Underwriters solely in covering sales of securities in excess of the
aggregate principal amount of Firm Notes. The option granted hereunder may be
exercised at any time upon notice by the Representatives to the Company, which
notice may be given at any time within 30 days from the date of this Agreement.
The time and date of delivery of the Option Notes, if subsequent to the First
Closing Date, is called the "Second Closing Date" and shall be determined by the
Representatives and shall not be earlier than three nor later than five full
business days after delivery of such notice of exercise. If any Option Notes are
to be purchased, each Underwriter agrees, severally and not jointly, to purchase
the aggregate principal amount of Option Notes that bears the same proportion to
the aggregate principal amount of Option Notes to be purchased as the aggregate
principal amount of Firm Notes set forth on SCHEDULE A opposite the name of such
Underwriter bears to the total aggregate principal amount of Firm Notes. The
Representatives may cancel the option at any time prior to its expiration by
giving written notice of such cancellation to the Company.

         (d) PUBLIC OFFERING OF THE NOTES. The Representatives hereby advise the
Company that the Underwriters intend to offer for sale to the public, as
described in the Prospectus, their respective portions of the Notes as soon
after this Agreement has been executed and the

                                      -12-

<PAGE>

Registration Statement has been declared effective as the Representatives, in
their sole judgment, have determined is advisable and practicable.

         (e) PAYMENT FOR THE NOTES. Payment for the Notes shall be made at the
First Closing Date (and, if applicable, at the Second Closing Date) by wire
transfer in immediately available funds to the order of the Company.

         It is understood that the Representatives have been authorized, for
their own accounts and the accounts of the several Underwriters, to accept
delivery of and receipt for, and make payment of the purchase price for, the
Firm Notes and any Option Notes the Underwriters have agreed to purchase.
FleetBoston Robertson Stephens Inc., individually and not as a Representative of
the Underwriters, may (but shall not be obligated to) make payment for any Notes
to be purchased by any Underwriter whose funds shall not have been received by
the Representatives by the First Closing Date or the Second Closing Date, as the
case may be, for the account of such Underwriter, but any such payment shall not
relieve such Underwriter from any of its obligations under this Agreement.

         (f) DELIVERY OF THE NOTES. The Company shall deliver, or cause to be
delivered, a credit representing the Firm Notes to an account or accounts at The
Depository Trust Company, as designated by the Representatives for the accounts
of the Representatives and the several Underwriters at the First Closing Date,
against the irrevocable release of a wire transfer of immediately available
funds for the amount of the purchase price therefor. The Company shall also
deliver, or cause to be delivered a credit representing the Option Notes the
Underwriters have agreed to purchase at the First Closing Date (or the Second
Closing Date, as the case may be), to an account or accounts at The Depository
Trust Company as designated by the Representatives for the accounts of the
Representatives and the several Underwriters, against the irrevocable release of
a wire transfer of immediately available funds for the amount of the purchase
price therefor. Time shall be of the essence, and delivery at the time and place
specified in this Agreement is a further condition to the obligations of the
Underwriters.

         SECTION 3.  COVENANTS OF THE COMPANY.

         The Company further covenants and agrees with each Underwriter as
follows:

         (a) REGISTRATION STATEMENT MATTERS. The Company will (i) use its best
efforts to cause the Registration Statement to be declared effective or, if the
procedure in Rule 430A of the Securities Act is followed, to prepare and timely
file with the Commission under Rule 424(b) under the Securities Act a Prospectus
in a form approved by the Representatives containing information previously
omitted at the time of effectiveness of the Registration Statement in reliance
on Rule 430A of the Securities Act and (ii) not file any amendment to the
Registration Statement or supplement to the Prospectus of which the
Representatives shall not previously have been advised and furnished with a copy
or to which the Representatives shall have reasonably objected in writing or
which is not in compliance with the Securities Act. If the Company elects to
rely on Rule 462(b) under the Securities Act, the Company shall file a Rule
462(b) Registration Statement with the Commission in compliance with Rule 462(b)
under the Securities Act prior to the time confirmations are sent or given, as
specified by Rule 462(b)(2)

                                      -13-

<PAGE>

under the Securities Act, and shall pay the applicable fees in accordance with
Rule 111 under the Securities Act.

         (b) SECURITIES ACT COMPLIANCE. The Company will advise the
Representatives promptly (i) when the Registration Statement or any
post-effective amendment thereto shall be declared effective, (ii) of receipt of
any comments from the Commission, (iii) of any request of the Commission for
amendment of the Registration Statement or for supplement to the Prospectus or
for any additional information and (iv) of the issuance by the Commission of any
stop order suspending the effectiveness of the Registration Statement or the use
of the Prospectus or of the institution of any proceedings for that purpose. The
Company will use its best efforts to prevent the issuance of any such stop order
preventing or suspending the use of the Prospectus and to obtain as soon as
possible the lifting thereof, if issued.

         (c) BLUE SKY COMPLIANCE. The Company will cooperate with the
Representatives and counsel for the Underwriters in endeavoring to qualify the
Notes for sale under the securities laws of such jurisdictions (both national
and foreign) as the Representatives may reasonably request and will make such
applications, file such documents, and furnish such information as may be
reasonably required for that purpose, provided the Company shall not be required
to qualify as a foreign corporation or to file a general consent to service of
process in any jurisdiction where it is not now so qualified or required to file
such a consent. The Company will, from time to time, prepare and file such
statements, reports and other documents, as are or may be required to continue
such qualifications in effect for so long a period as the Representatives may
reasonably request for distribution of theNotes.

         (d) AMENDMENTS AND SUPPLEMENTS TO THE PROSPECTUS AND OTHER SECURITIES
ACT MATTERS. The Company will comply with the Securities Act and the Exchange
Act, and the rules and regulations of the Commission thereunder, so as to permit
the completion of the distribution of the Notes as contemplated in this
Agreement and the Prospectus. If during the period in which a prospectus is
required by law to be delivered by an Underwriter or dealer, any event shall
occur as a result of which, in the judgment of the Company or in the reasonable
opinion of the Representatives or counsel for the Underwriters, it becomes
necessary to amend or supplement the Prospectus in order to make the statements
therein, in the light of the circumstances existing at the time the Prospectus
is delivered to a purchaser, not misleading, or, if it is necessary at any time
to amend or supplement the Prospectus to comply with any law, the Company
promptly will prepare and file with the Commission, and furnish at its own
expense to the Underwriters and to dealers, an appropriate amendment to the
Registration Statement or supplement to the Prospectus so that the Prospectus as
so amended or supplemented will not, in the light of the circumstances when it
is so delivered, be misleading, or so that the Prospectus will comply with the
law.

         (e) COPIES OF ANY AMENDMENTS AND SUPPLEMENTS TO THE PROSPECTUS. The
Company agrees to furnish the Representatives, without charge, during the period
beginning on the date hereof and ending on the later of the First Closing Date
or such date, as in the opinion of counsel for the Underwriters, the Prospectus
is no longer required by law to be delivered in connection with sales by an
Underwriter or dealer (the "Prospectus Delivery Period"), as many copies of the
Prospectus and any amendments and supplements thereto as the Representatives may
request.

                                      -14-

<PAGE>

         (f) INSURANCE. The Company shall obtain Directors and Officers
liability insurance in the minimum amount of $10.0 million which shall apply to
the offering contemplated hereby.

         (g) NOTICE OF SUBSEQUENT EVENTS. If at any time during the ninety (90)
day period after the Registration Statement becomes effective, any rumor,
publication or event relating to or affecting the Company shall occur as a
result of which in your opinion the market price of the Company Notes has been
or is likely to be materially affected (regardless of whether such rumor,
publication or event necessitates a supplement to or amendment of the
Prospectus), the Company will, after written notice from you advising the
Company to the effect set forth above, promptly prepare, consult with you
concerning the substance of and disseminate a press release or other public
statement, reasonably satisfactory to you, responding to or commenting on such
rumor, publication or event.

         (h) USE OF PROCEEDS. The Company shall apply the net proceeds from the
sale of the Notes sold by it in the manner described under the caption "Use of
Proceeds" in the Prospectus.

         (i) TRANSFER AGENT. The Company shall engage and maintain, at its
expense, a registrar and transfer agent for the Common Stock.

         (j) EARNINGS STATEMENT. As soon as practicable, the Company will make
generally available to its security holders and to the Representatives an
earnings statement (which need not be audited) covering a period of at least 12
months beginning after the effective date of the Registration Statement that
satisfies the provisions of Section 11(a) of the Securities Act.

         (k) PERIODIC REPORTING OBLIGATIONS. During the Prospectus Delivery
Period the Company shall file, on a timely basis, with the Commission and the
Nasdaq National Market all reports and documents required to be filed under the
Exchange Act as required by the NASD.

         (l) AGREEMENT NOT TO OFFER OR SELL ADDITIONAL SECURITIES. The Company
will not, without the prior written consent of FleetBoston Robertson Stephens
Inc., for a period of 90 days following the date of the Prospectus, offer, sell
or contract to sell, or otherwise dispose of or enter into any transaction which
is designed to, or could be expected to, result in the disposition (whether by
actual disposition or effective economic disposition due to cash settlement or
otherwise by the Company or any affiliate of the Company or any person in
privity with the Company or any affiliate of the Company) directly or
indirectly, or announce the offering of, any of its Common Stock or any
securities convertible into, or exchangeable for, Common Stock; PROVIDED,
HOWEVER, that the Company may (i) issue Common Stock upon conversion of the
Notes, (ii) issue and sell Common Stock pursuant to any director or employee
stock option plan, stock ownership plan or dividend reinvestment plan of the
Company in effect at the date of the Prospectus and described in the Prospectus
so long as at the time of such issuance or sale, the Company already has or
otherwise obtains a Lock-Up Agreement in the form of Exhibit 1-1 from such
holder providing that none of those shares of Common Stock may be transferred
during the period of 90 days from the date that the Registration Statement is
declared effective (the "Lock-Up Period") and the Company shall enter stop
transfer instructions with its transfer agent and registrar against the transfer
of any such Common Stock, (iii) the Company may issue

                                      -15-

<PAGE>

the shares of Common Stock to be issued in a concurrent offering as described in
the Prospectus, and (iv) the Company may issue Common Stock issuable upon the
conversion of securities or the exercise of warrants outstanding at the date of
the Prospectus and described in the Prospectus. Notwithstanding the foregoing,
FleetBoston Robertson Stephens Inc. agrees it will not unreasonably withhold
consent to the issuance of equity securities in connection with an acquisition.

         (m) FUTURE REPORTS TO THE REPRESENTATIVES. During the period of three
years from the date hereof the Company will furnish to the Representatives (i)
as soon as practicable after the end of each fiscal year, copies of the Annual
Report of the Company containing the balance sheet of the Company as of the
close of such fiscal year and statements of income, stockholders' equity and
cash flows for the year then ended and the unqualified opinion thereon of the
Company's independent public or certified public accountants; (ii) as soon as
practicable after the filing thereof, copies of each proxy statement, Annual
Report on Form 10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K
or other report filed by the Company with the Commission, the National
Association of Securities Dealers, LLC or any securities exchange; and (iii) as
soon as available, copies of any report or communication of the Company mailed
generally to holders of its capital stock.

         (n) DEPOSITORY TRUST COMPANY. The Company shall use its best efforts to
permit the Notes to be eligible for clearance and settlement through the
Depository Trust Company.

         SECTION 4. CONDITIONS OF THE OBLIGATIONS OF THE UNDERWRITERS. The
obligations of the several Underwriters to purchase and pay for the Notes as
provided herein on the First Closing Date and, with respect to the Option Notes,
the Second Closing Date, shall be subject to the accuracy of the representations
and warranties on the part of the Company set forth in Section 1 hereof as of
the date hereof and as of the First Closing Date as though then made and, with
respect to the Option Notes, as of the Second Closing Date as though then made,
to the timely performance by the Company of its covenants and other obligations
hereunder, and to each of the following additional conditions:

         (a) COMPLIANCE WITH REGISTRATION REQUIREMENTS, NO STOP ORDER, NO
OBJECTION FROM THE NATIONAL ASSOCIATION OF SECURITIES DEALERS, LLC. The
Registration Statement shall have been declared effective prior to the execution
of this Agreement, or at such later date as shall be consented to in writing by
you; and no stop order suspending the effectiveness thereof shall have been
issued and no proceedings for that purpose shall have been initiated or, to the
knowledge of the Company or any Underwriter, threatened by the Commission, and
any request of the Commission for additional information (to be included in the
Registration Statement or the Prospectus or otherwise) shall have been complied
with to the satisfaction of Underwriters' Counsel; and the National Association
of Securities Dealers, LLC shall have raised no objection to the fairness and
reasonableness of the underwriting terms and arrangements.

         (b) CORPORATE PROCEEDINGS. All corporate proceedings and other legal
matters in connection with this Agreement, the Registration Statement and the
Prospectus, and the registration, authorization, issue, sale and delivery of the
Notes and the authorization, issuance and delivery of the Common Stock issuable
upon conversion of the Notes, shall have been in

                                      -16-

<PAGE>

form and substance reasonably satisfactory to Underwriters' Counsel, and such
counsel shall have been furnished with such papers and information as they may
reasonably have requested to enable them to pass upon the matters referred to in
this Section 4.

         (c) NO MATERIAL ADVERSE CHANGE. Subsequent to the execution and
delivery of this Agreement and prior to the First Closing Date, or the Second
Closing Date, as the case may be, there shall not have been any Material Adverse
Change in the condition (financial or otherwise), earnings, operations, business
or prospects of the Company and its subsidiaries considered as one enterprise
from that described in the Registration Statement or Prospectus, which, in your
sole judgment, is material and adverse and that makes it, in your sole judgment,
impracticable or inadvisable to proceed with the public offering of the Notes as
contemplated by the Prospectus.

         (d) OPINION OF COUNSEL FOR THE COMPANY. You shall have received on the
First Closing Date and the Second Closing Date, as the case may be, an opinion
of Bingham Dana LLP counsel for the Company substantially in the form of EXHIBIT
B attached hereto, dated the First Closing Date or the Second Closing Date, as
the case may be, addressed to the Underwriters and with reproduced copies or
signed counterparts thereof for each of the Underwriters.

         (e) OPINION OF GOVERNMENT REGULATION COUNSEL FOR THE COMPANY. You shall
have received on the First Closing Date and the Second Closing Date, as the case
may be, an opinion of Swidler Berlin Sheroff Friedman, LLP, government
regulation counsel for the Company substantially in the form of EXHIBIT C
attached hereto.

         (f) OPINION OF COUNSEL FOR THE UNDERWRITERS. You shall have received on
the First Closing Date and the Second Closing Date, as the case may be, an
opinion of Alston & Bird LLP, substantially in the form of EXHIBIT D hereto. The
Company shall have furnished to such counsel such documents as they may have
requested for the purpose of enabling them to pass upon such matters.

         (g) ACCOUNTANTS' COMFORT LETTER. You shall have received on the First
Closing Date and on the Second Closing Date, as the case may be, a letter from
Arthur Andersen LLP addressed to the Underwriters, dated the First Closing Date
or the Second Closing Date, as the case may be, confirming that they are
independent certified public accountants with respect to the Company within the
meaning of the Securities Act and the applicable published Rules and Regulations
and based upon the procedures described in such letter delivered to you
concurrently with the execution of this Agreement (herein called the "Original
Letter"), but carried out to a date not more than four (4) business days prior
to the First Closing Date or the Second Closing Date, as the case may be, (i)
confirming, to the extent true, that the statements and conclusions set forth in
the Original Letter are accurate as of the First Closing Date or the Second
Closing Date, as the case may be, and (ii) setting forth any revisions and
additions to the statements and conclusions set forth in the Original Letter
which are necessary to reflect any changes in the facts described in the
Original Letter since the date of such letter, or to reflect the availability of
more recent financial statements, data or information. The letter shall not
disclose any change in the condition (financial or otherwise), earnings,
operations, business or prospects of the Company and its subsidiaries considered
as one enterprise from that described in the Registration Statement or
Prospectus, which, in your sole judgment, is material and adverse and that makes
it,

                                      -17-

<PAGE>

in your sole judgment, impracticable or inadvisable to proceed with the public
offering of the Notes as contemplated by the Prospectus. The Original Letter
from Arthur Andersen LLP shall be addressed to or for the use of the
Underwriters in form and substance satisfactory to the Underwriters and shall
(i) represent, to the extent true, that they are independent certified public
accountants with respect to the Company within the meaning of the Securities Act
and the applicable published Rules and Regulations, (ii) set forth their opinion
with respect to their examination of the consolidated balance sheet of the
Company as of December 31, 1998 and 1999 and related consolidated statements of
operations, shareholders' equity, and cash flows for the twelve (12) months
ended December 31, 1997, 1998 and 1999, and (iii) address other matters agreed
upon by Arthur Andersen LLP and you. In addition, you shall have received from
Arthur Andersen LLP a letter addressed to the Company and made available to you
for the use of the Underwriters stating that their review of the Company's
system of internal accounting controls, to the extent they deemed necessary in
establishing the scope of their examination of the Company's consolidated
financial statements as of December 31, 1999, did not disclose any weaknesses in
internal controls that they considered to be material weaknesses.

         (h) OFFICERS' CERTIFICATE. You shall have received on the First Closing
Date and the Second Closing Date, as the case may be, a certificate of the
Company, dated the First Closing Date or the Second Closing Date, as the case
may be, signed by the Chief Executive Officer and Chief Financial Officer of the
Company, to the effect that, and you shall be satisfied that:

         (i) The representations and warranties of the Company in this Agreement
         are true and correct, as if made on and as of the First Closing Date or
         the Second Closing Date, as the case may be, and the Company has
         complied in all material respects with all the agreements and satisfied
         all the conditions on its part to be performed or satisfied at or prior
         to the First Closing Date or the Second Closing Date, as the case may
         be;

         (ii) No stop order suspending the effectiveness of the Registration
         Statement has been issued and no proceedings for that purpose have been
         instituted or are pending or threatened under the Securities Act;

         (iii) When the Registration Statement became effective and at all times
         subsequent thereto up to the delivery of such certificate, the
         Registration Statement and the Prospectus, and any amendments or
         supplements thereto, contained all material information required to be
         included therein by the Securities Act and in all material respects
         conformed to the requirements of the Securities Act, the Registration
         Statement and the Prospectus, and any amendments or supplements
         thereto, did not and does not include any untrue statement of a
         material fact or omit to state a material fact required to be stated
         therein or necessary to make the statements therein, in light of the
         circumstances under which they were made not misleading; and, since the
         effective date of the Registration Statement, there has occurred no
         event required to be set forth in an amended or supplemented Prospectus
         which has not been so set forth; and

         (iv) Subsequent to the respective dates as of which information is
         given in the Registration Statement and Prospectus, there has not been
         (a) any material adverse change in the condition (financial or
         otherwise), earnings, operations, business or

                                      -18-

<PAGE>

         prospects of the Company and its subsidiaries considered as one
         enterprise, (b) any transaction that is material to the Company and its
         subsidiaries considered as one enterprise, except transactions entered
         into in the ordinary course of business, (c) any obligation, direct or
         contingent, that is material to the Company and its subsidiaries
         considered as one enterprise, incurred by the Company or its
         subsidiaries, except obligations incurred in the ordinary course of
         business, (d) except as described in the Prospectus, any change in the
         capital stock or outstanding indebtedness of the Company or any of its
         subsidiaries that is material to the Company and its subsidiaries
         considered as one enterprise, (e) any dividend or distribution of any
         kind declared, paid or made on the capital stock of the Company or any
         of its subsidiaries, or (f) any loss or damage (whether or not insured)
         to the property of the Company or any of its subsidiaries which has
         been sustained or will have been sustained which has had or would
         reasonably be expected to have a material adverse effect on the
         condition (financial or otherwise), earnings, operations, business or
         prospects of the Company and its subsidiaries considered as one
         enterprise.

         (i) LOCK-UP AGREEMENT FROM CERTAIN STOCKHOLDERS OF THE COMPANY. The
Company shall have obtained and delivered to you an agreement in the form of
EXHIBIT A attached hereto from each officer and director of the Company, and
each beneficial owner of one or more percent of the outstanding issued share
capital of the Company (including holders of options to acquire the same).

         (j) STOCK EXCHANGE LISTING. The Common Stock issuable upon conversion
of the Notes shall have been approved for quotation on the Nasdaq National
Market, subject only to official notice of issuance.

         (k) COMPLIANCE WITH PROSPECTUS DELIVERY REQUIREMENTS. The Company shall
have complied with the provisions of Section 3(e) hereof with respect to the
furnishing of Prospectuses.

         (l) INDENTURE MATTERS. The Indenture shall have been duly executed and
delivered by the Company and the Trustee and the Notes shall have been duly
executed and delivered by the Company and duly authenticated by the Trustee.

         (m) ADDITIONAL DOCUMENTS. On or before each of the First Closing Date
and the Second Closing Date, as the case may be, the Representative and counsel
for the Underwriters shall have received such information, documents and
opinions as they may reasonably require for the purposes of enabling them to
pass upon the issuance and sale of the Notes as contemplated herein, or in order
to evidence the accuracy of any of the representations and warranties, or the
satisfaction of any of the conditions or agreements, herein contained.

         If any condition specified in this Section 4 is not satisfied when and
as required to be satisfied, this Agreement may be terminated by the
Representative by notice to the Company at any time on or prior to the First
Closing Date and, with respect to the Option Notes, at any time prior to the
Second Closing Date, which termination shall be without liability on the part of
any party to any other party, except that Section 5 (Payment of Expenses),
Section 6 (Reimbursement

                                      -19-

<PAGE>

of Underwriters' Expenses), Section 7 (Indemnification and Contribution) and
Section 10 (Representations and Indemnities to Survive Delivery) shall at all
times be effective and shall survive such termination.

         SECTION 5. PAYMENT OF EXPENSES. The Company agrees to pay all costs,
fees and expenses incurred in connection with the performance of its obligations
hereunder and in connection with the transactions contemplated hereby,
including, without limitation, (i) all expenses incident to the issuance and
delivery of the Notes (including all printing and engraving costs), (ii) all
fees and expenses of the registrar and transfer agent of the Common Stock, (iii)
all necessary issue, transfer and other stamp taxes in connection with the
issuance and sale of the Notes to the Underwriters, (iv) all fees and expenses
of the Company's counsel, independent public or certified public accountants and
other advisors, (v) all costs and expenses incurred in connection with the
preparation, printing, filing, shipping and distribution of the Registration
Statement (including financial statements, exhibits, schedules, consents and
certificates of experts), each preliminary prospectus and the Prospectus, and
all amendments and supplements thereto, and this Agreement, (vi) all filing
fees, attorneys' fees and expenses incurred by the Company or the Underwriters
in connection with qualifying or registering (or obtaining exemptions from the
qualification or registration of) all or any part of the Notes for offer and
sale under the state securities or blue sky laws or the provincial securities
laws of Canada or any other country, and, if requested by the Representatives,
preparing and printing a "Blue Sky Survey," an "International Blue Sky Survey"
or other memorandum, and any supplements thereto, advising the Underwriters of
such qualifications, registrations and exemptions, (vii) the filing fees
incident to the NASD review and approval of the Underwriters' participation in
the offering and distribution of theNotes, (viii) the fees and expenses
associated with obtaining approval for the quotation of the Common Stock
issuable upon conversion of the Notes on the Nasdaq National Market, (ix) all
reasonable costs and expenses incident to the preparation and undertaking of
"road show" presentations to be made to prospective investors, and (x) all other
fees, costs and expenses referred to in Item 13 of Part II of the Registration
Statement, PROVIDED, that in no event shall the Company be required to pay in
excess of $20,000 in respect of the fees and expenses of Underwriter's counsel,
pursuant to this Section 5, or Section 5 of the Underwriting Agreement, dated as
of the date hereof, relating to the Company's concurrent public offering of
Common Stock. Except as provided in this Section 5, Section 6, and Section 7
hereof, the Underwriters shall pay their own expenses, including the fees and
disbursements of their counsel.

         SECTION 6. REIMBURSEMENT OF UNDERWRITERS' EXPENSES. If this Agreement
is terminated by the Representative pursuant to Section 4, Section 7, Section 8
or Section 9, or if the sale to the Underwriters of the Notes on the First
Closing Date is not consummated because of any refusal, inability or failure on
the part of the Company to perform any agreement herein or to comply with any
provision hereof, the Company agrees to reimburse the Representatives and the
other Underwriters (or such Underwriters as have terminated this Agreement with
respect to themselves), severally, upon demand for all out-of-pocket expenses
that shall have been reasonably and actually incurred by the Representatives and
the Underwriters prior to the date of termination in connection with the
proposed purchase and the offering and sale of the Notes, including, without
limitations, to fees and disbursements of counsel, printing expenses, travel
expenses, postage, facsimile and telephone charges.

                                      -20-

<PAGE>

         SECTION 7.  INDEMNIFICATION AND CONTRIBUTION.

         (a) INDEMNIFICATION OF THE UNDERWRITERS. The Company agrees to
indemnify and hold harmless each Underwriter, its officers and employees, and
each person, if any, who controls any Underwriter within the meaning of the
Securities Act and the Exchange Act against any loss, claim, damage, liability
or expense, as incurred, to which such Underwriter or such controlling per-son
may become subject, under the Securities Act, the Exchange Act or other federal
or state statutory law or regulation, or at common law or otherwise (including
in settlement of any litigation, if such settlement is effected with the written
consent of the Company, which consent shall not be unreasonably withheld or
delayed), insofar as such loss, claim, damage, liability or expense (or actions
in respect thereof as contemplated below) arises out of or is based (i) upon any
untrue statement or alleged untrue statement of a material fact contained in the
Registration Statement, or any amendment thereto, including any information
deemed to be a part thereof pursuant to Rule 430A or Rule 434 under the
Securities Act, or the omission or alleged omission therefrom of a material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading; or (ii)
upon any untrue statement or alleged untrue statement of a material fact
contained in any preliminary prospectus or the Prospectus (or any amendment or
supplement thereto), or the omission or alleged omission therefrom of a material
fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading; or (iii) in whole or
in part upon any inaccuracy in the representations and warranties of the Company
contained herein; or (iv) in whole or in part upon any failure of the Company to
perform its obligations hereunder or under applicable law; or (v) any act or
failure to act or any alleged act or failure to act by any Underwriter in
connection with, or relating in any manner to, the Note or the offering
contemplated hereby, and which is included as part of or referred to in any
loss, claim, damage, liability or action arising out of or based upon any matter
covered by clause (i), (ii), (iii) or (iv) above, provided that the Company
shall not be liable under this clause (v) to the extent that a court of
competent jurisdiction shall have determined by a final judgment that such loss,
claim, damage, liability or action resulted directly from any such acts or
failures to act undertaken or omitted to be taken by such Underwriter through
its bad faith or willful misconduct; and to reimburse each Underwriter and each
such controlling person for any and all expenses (including the reasonable fees
and disbursements of counsel chosen by FleetBoston Robertson Stephens Inc.) as
such expenses are reasonably incurred by such Underwriter or such controlling
person in connection with investigating, defending, settling, compromising or
paying any such loss, claim, damage, liability, expense or action; PROVIDED,
HOWEVER, that the foregoing indemnity agreement shall not apply to any loss,
claim, damage, liability or expense to the extent, but only to the extent,
arising out of or based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in reliance upon and in conformity with
written information furnished to the Company by the Representatives expressly
for use in the Registration Statement, any preliminary prospectus or the
Prospectus (or any amendment or supplement thereto); and provided, further, that
with respect to any preliminary prospectus, the foregoing indemnity agreement
shall not inure to the benefit of any Underwriter from whom the person asserting
any loss, claim, damage, liability or expense purchasedNotes, or any person
controlling such Underwriter, if copies of the Prospectus were timely delivered
to the Underwriter pursuant to Section 2 and a copy of the Prospectus. (as then
amended or supplemented if the Company shall

                                      -21-

<PAGE>

have furnished any amendments or supplements thereto) was not sent or given by
or on behalf of such Underwriter to such person, if required by law so to have
been delivered, at or prior to the written confirmation of the sale of the Notes
to such person, and if the Prospectus (as so amended or supplemented) would have
cured the defect giving rise to such loss, claim, damage, liability or expense.
The indemnity agreement set forth in this Section 7(a) shall be in addition to
any liabilities that the Company may otherwise have.

         (b) INDEMNIFICATION OF THE COMPANY, ITS DIRECTORS AND OFFICERS. Each
Underwriter agrees, severally and not jointly, to indemnify and hold harmless
the Company, each of its directors, each of its officers who signed the
Registration Statement and each person, if any, who controls the Company within
the meaning of the Securities Act or the Exchange Act, against any loss, claim,
damage, liability or expense, as incurred, to which the Company, or any such
director, officer or controlling person may become subject, under the Securities
Act, the Exchange Act, or other federal or state statutory law or regulation, or
at common law or otherwise (including in settlement of any litigation, if such
settlement is effected with the written consent of such Underwriter), insofar as
such loss, claim, damage, liability or expense (or actions in respect thereof as
contemplated below) arises out of or is based (i) upon any untrue or alleged
untrue statement of a material fact contained in the Registration Statement, any
preliminary prospectus or the Prospectus (or any amendment or supplement
thereto), or arises out of or is based upon the omission or alleged omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein, in light of the circumstances under which they were
made, not misleading in each case to the extent, but only to the extent, that
such untrue statement or alleged untrue statement or omission or alleged
omission was made in the Registration Statement, any preliminary prospectus, the
Prospectus (or any amendment or supplement thereto), in reliance upon and in
conformity with written information furnished to the Company by the
Representatives expressly for use therein and (ii) in whole or in part upon any
failure of any Underwriter to perform its obligations hereunder or under
applicable law; and to reimburse the Company, or any such director, officer or
controlling person for any legal and other expense reasonably incurred by the
Company, or any such director, officer or controlling person in connection with
investigating, defending, settling, compromising or paying any such loss, claim,
damage, liability, expense or action. The indemnity agreement set forth in this
Section 7(b) shall be in addition to any liabilities that each Underwriter may
otherwise have.

         (c) INFORMATION PROVIDED BY THE UNDERWRITERS. The Company hereby
acknowledges that the only information that the Underwriters have furnished to
the Company expressly for use in the Registration Statement, any preliminary
prospectus or the Prospectus (or any amendment or supplement thereto) are the
statements set forth in the table in the first paragraph, the second paragraph,
the third paragraph and the tenth paragraph under the caption "Underwriting" in
the Prospectus; and the Underwriters confirm that such statements are true and
correct in all material respects.

         (d) NOTIFICATIONS AND OTHER INDEMNIFICATION PROCEDURES. Promptly after
receipt by an indemnified party under this Section 7 of notice of the
commencement of any action, such indemnified party will, if a claim in respect
thereof is to be made against an indemnifying party under this Section 7, notify
the indemnifying party in writing of the commencement thereof, but the omission
so to notify the indemnifying party will not relieve it from any liability which
it

                                      -22-

<PAGE>

may have to any indemnified party for contribution or otherwise than under the
indemnity agreement contained in this Section 7 or to the extent it is not
prejudiced as a proximate result of such failure. In case any such action is
brought against any indemnified party and such indemnified party seeks or
intends to seek indemnity from an indemnifying party, the indemnifying party
will be entitled to participate in, and, to the extent that it shall elect,
jointly with all other indemnifying parties similarly notified, by written
notice delivered to the indemnified party promptly after receiving the aforesaid
notice from such indemnified party, to assume the defense thereof with counsel
reasonably satisfactory to such indemnified party; PROVIDED, HOWEVER, if the
defendants in any such action include both the indemnified party and the
indemnifying party and the indemnified party shall have reasonably concluded
that a conflict may arise between the positions of the indemnifying party and
the indemnified party in conducting the defense of any such action or that there
may be legal defenses available to it and/or other indemnified parties which are
different from or additional to those available to the indemnifying party, the
indemnified party or parties shall have the right to select separate counsel to
assume such legal defenses and to otherwise participate in the defense of such
action on behalf of such indemnified party or parties. Upon receipt of notice
from the indemnifying party to such indemnified party of such indemnifying
party's election so to assume the defense of such action and approval by the
indemnified party of counsel, the indemnifying party will not be liable to such
indemnified party under this Section 7 for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed separate counsel in
accordance with the proviso to the next preceding sentence (it being understood,
however, that the indemnifying party shall not be liable for the expenses of
more than one separate counsel (together with local counsel), approved by the
indemnifying party (FleetBoston Robertson Stephens Inc. in the case of Section
7(b) and Section 8), representing the indemnified parties who are parties to
such action), (ii) the indemnifying party shall not have employed counsel
satisfactory to the indemnified party to represent the indemnified party within
a reasonable time after notice of commencement of the action, or (iii) the
indemnifying party has authorized the employment of counsel for the indemnified
party at the expense of the indemnifying party, in each of which cases the fees
and expenses of counsel shall be at the expense of the indemnifying party.

         (e) SETTLEMENTS. The indemnifying party under this Section 7 shall not
be liable for any settlement of any proceeding effected without its written
consent, which consent shall not be unreasonably withheld or delayed, but if
settled with such consent or if there be a final judgment for the plaintiff, the
indemnifying party agrees to indemnify the indemnified party against any loss,
claim, damage, liability or expense by reason of such settlement or judgment.
Notwithstanding the foregoing sentence, if at any time an indemnified party
shall have requested an indemnifying party to reimburse the indemnified party
for fees and expenses of counsel as contemplated by Section 7(d) hereof, the
indemnifying party agrees that it shall be liable for any settlement of any
proceeding effected without its written consent if (i) such settlement is
entered into more than 30 days after receipt by such indemnifying party of the
aforesaid request and (ii) such indemnifying party shall not have reimbursed the
indemnified party in accordance with such request prior to the date of such
settlement. No indemnifying party shall, without the prior written consent of
the indemnified party, effect any settlement, compromise or consent to the entry
of judgment in any pending or threatened action, suit or proceeding in respect
of which any indemnified party is or could have been a party and indemnity was
or could have been sought

                                      -23-

<PAGE>

hereunder by such indemnified party, unless such settlement, compromise or
consent includes (i) an unconditional release of such indemnified party from all
liability on claims that are the subject matter of such action, suit or
proceeding and (ii) does not include a statement as to or an admission of fault,
culpability or a failure to act by or on behalf of any indemnified party.

         (f) CONTRIBUTION. If the indemnification provided for in this Section 7
is unavailable to or insufficient to hold harmless an indemnified party under
Section 7(a) or (b) above in respect of any losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) then each
indemnifying party shall contribute to the aggregate amount paid or payable by
such indemnified party in such proportion as is appropriate to reflect the
relative benefits received by the Company on the one hand and the Underwriters
on the other from the offering of the Notes. If, however, the allocation
provided by the immediately preceding sentence is not permitted by applicable
law then each indemnifying party shall contribute to such amount paid or payable
by such indemnified party in such proportion as is appropriate to reflect not
only such relative benefits but also the relative fault of the Company on the
one hand and the Underwriters on the other in connection with the statements or
omissions which resulted in such losses, claims, damages or liabilities, (or
actions or proceedings in respect thereof), as well as any other relevant
equitable considerations. The relative benefits received by the Company on the
one hand and the Underwriter on the other shall be deemed to be in the same
proportion as the total net proceeds from the offering (before deducting
expenses) received by the Company bears to the total underwriting discount
received by the Underwriters, in each case as set forth in the table on the
cover page of the Prospectus. The relative fault shall be determined by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or the omission or alleged omission to state a material fact
relates to information supplied by the Company on the one hand or the
Underwriters on the other and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.

         The Company and Underwriters agree that it would not be just and
equitable if contributions pursuant to this Section 7(f) were determined by pro
rata allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation which does not take account of the
equitable considerations referred to above in this Section 7(f). The amount paid
or payable by an indemnified party as a result of the losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) referred to above in
this Section 7(f) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any such action or claim. Notwithstanding the provisions of this
subsection (f), (i) no Underwriter shall be required to contribute any amount in
excess of the underwriting discount applicable to the Notes purchased by such
Underwriter and (ii) no person guilty of fraudulent misrepresentation (within
the meaning of Section 11 (f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. The Underwriters' obligations in this Section 7(f) to
contribute are several in proportion to their respective underwriting
obligations and not joint.

         (g) TIMING OF ANY PAYMENTS OF INDEMNIFICATION. Any losses, claims,
damages, liabilities or expenses for which an indemnified party is entitled to
indemnification or contribution under this Section 7 shall be paid by the
indemnifying party to the indemnified party

                                      -24-

<PAGE>

as such losses, claims, damages, liabilities or expenses are incurred, but in
all cases, no later than thirty (30) days of invoice to the indemnifying party.

         (h) SURVIVAL. The indemnity and contribution agreements contained in
this Section 7 and the representation and warranties of the Company set forth in
this Agreement shall remain operative and in full force and effect, regardless
of (i) any investigation made by or on behalf of any Underwriter or any person
controlling any Underwriter, the Company, its directors or officers or any
persons controlling the Company, (ii) acceptance of any Notes and payment
therefor hereunder, and (iii) any termination of this Agreement. A successor to
any Underwriter, or to the Company, its directors or officers, or any person
controlling the Company, shall be entitled to the benefits of the indemnity,
contribution and reimbursement agreements contained in this Section 7.

         (i) ACKNOWLEDGEMENTS OF PARTIES. The parties to this Agreement hereby
acknowledge that they are sophisticated business persons who were represented by
counsel during the negotiations regarding the provisions hereof including,
without limitation, the provisions of this Section 7, and are fully informed
regarding said provisions. They further acknowledge that the provisions of this
Section 7 fairly allocate the risks in light of the ability of the parties to
investigate the Company and its business in order to assure that adequate
disclosure is made in the Registration Statement and Prospectus as required by
the Securities Act and the Exchange Act.

         SECTION 8. DEFAULT OF ONE OR MORE OF THE SEVERAL UNDERWRITERS. If, on
the First Closing Date or the Second Closing Date, as the case may be, any one
or more of the several Underwriters shall fail or refuse to purchase Notes that
it or they have agreed to purchase on such date, and the aggregate principal
amount of Notes which such defaulting Underwriter or Underwriters agreed but
failed or refused to purchase does not exceed 10% of the aggregate principal
amount of Notes to be purchased on such date, the other Underwriters shall be
obligated, severally, in the proportions that the aggregate principal amount of
Firm Notes set forth opposite their respective names on SCHEDULE A bears to the
aggregate principal amount of Firm Notes set forth opposite the names of all
such non-defaulting Underwriters, or in such other proportions as may be
specified by the Representatives with the consent of the non-defaulting
Underwriters, to purchase the Notes which such defaulting Underwriter or
Underwriters agreed but failed or refused to purchase on such date. If, on the
First Closing Date or the Second Closing Date, as the case may be, any one or
more of the Underwriters shall fail or refuse to purchase Notes and the
aggregate principal amount of Notes with respect to which such default occurs
exceeds 10% of the aggregate principal amount of Notes to be purchased on such
date, and arrangements satisfactory to the Representatives and the Company for
the purchase of such Notes are not made within 48 hours after such default, this
Agreement shall terminate without liability of any party to any other party
except that the provisions of Section 4, and Section 7 shall at all times be
effective and shall survive such termination. In any such case either the
Representatives or the Company shall have the right to postpone the First
Closing Date or the Second Closing Date, as the case may be, but in no event for
longer than seven days in order that the required changes, if any, to the
Registration Statement and the Prospectus or any other documents or arrangements
may be effected.

- -25-

<PAGE>

         As used in this Agreement, the term "Underwriter" shall be deemed to
include any person substituted for a defaulting Underwriter under this Section
8. Any action taken under this Section 8 shall not relieve any defaulting
Underwriter from liability in respect of any default of such Underwriter under
this Agreement.

         SECTION 9. TERMINATION OF THIS AGREEMENT. Prior to the First Closing
Date, this Agreement may be terminated by the Representatives by notice given to
the Company if at any time (i) trading or quotation in any of the Company's
securities shall have been suspended or limited by the Commission or by the
Nasdaq Stock Market, or trading in securities generally on either the Nasdaq
Stock Market or the New York Stock Exchange shall have been suspended or
limited, or minimum or maximum prices shall have been generally established on
any of such stock exchanges by the Commission or the National Association of
Securities Dealers, LLC; (ii) a general banking moratorium shall have been
declared by any of federal, state, or local authorities; (iii) there shall have
occurred any outbreak or escalation of national or international hostilities or
any crisis or calamity, or any change in the United States or international
financial markets, or any substantial change or development involving a
prospective change in United States' or international political, financial or
economic conditions, as in the reasonable judgment of the Representatives is
material and adverse and makes it impracticable or inadvisable to market the
Notes in the manner and on the terms described in the Prospectus or to enforce
contracts for the sale of securities; (iv) in the reasonable judgment of the
Representatives there shall have occurred any Material Adverse Change; or (v)
the Company shall have sustained a loss by strike, fire, flood, earthquake,
accident or other calamity of such character as in the reasonable judgment of
the Representatives may interfere materially with the conduct of the business
and operations of the Company regardless of whether or not such loss shall have
been insured. Any termination pursuant to this Section 9 shall be without
liability on the part of (a) the Company to any Underwriter, except that the
Company shall be obligated to reimburse the expenses of the Representatives and
the Underwriters pursuant to Sections 5 and 6 hereof, (b) any Underwriter to the
Company, or (c) of any party hereto to any other party except that the
provisions of Section 7 shall at all times be effective and shall survive such
termination.

         SECTION 10. REPRESENTATIONS AND INDEMNITIES TO SURVIVE DELIVERY. The
respective indemnities, agreements, representations, warranties and other
statements of the Company, of its officers and of the several Underwriters set
forth in or made pursuant to this Agreement will remain in full force and
effect, regardless of any investigation made by or on behalf of any Underwriter
or the Company or any of its or their respective partners, officers or directors
or any controlling person, as the case may be, and will survive delivery of and
payment for the Notes sold hereunder and any termination of this Agreement.

         SECTION 11. NOTICES. All communications hereunder shall be in writing
and shall be mailed, hand delivered or telecopied and confirmed to the parties
hereto as follows:

                                      -26-

<PAGE>

If to the Representatives:

         FLEETBOSTON ROBERTSON STEPHENS INC.
         555 California Street
         San Francisco, California 94104
         Facsimile: (415) 676-2696
         Attention: General Counsel

         Copy to:
         Alston & Bird LLP
         One Atlantic Center
         1201 West Peachtree Street
         Atlanta, Georgia 30309
         Facsimile: (404) 881-4777
         Attention: J. Vaughan Curtis, Esq.

If to the Company

         iBasis, Inc.
         20 Second Avenue
         Burlington, MA 01803
         Facsimile: 781-505-7300
         Attention: President

         Copy to:
         Bingham Dana LLP
         150 Federal Street
         Boston, MA 02110
         Facsimile: (617) 951-8736
         Attention: David L. Engel, Esq. and Johan V. Brigham, Esq.

Any party hereto may change the address for receipt of communications by giving
written notice to the others.

         SECTION 12. SUCCESSORS. This Agreement will inure to the benefit of and
be binding upon the parties hereto, including any substitute Underwriters
pursuant to Section 9 hereof, and to the benefit of the employees, officers and
directors and controlling persons referred to in Section 7, and to their
respective successors, and no other person will have any right or obligation
hereunder. The term "successors" shall not include any purchaser of the Notes as
such from any of the Underwriters merely by reason of such purchase.

         SECTION 13. PARTIAL UNENFORCEABILITY. The invalidity or
unenforceability of any Section, paragraph or provision of this Agreement shall
not affect the validity or enforceability of any other Section, paragraph or
provision hereof. If any Section, paragraph or provision of this Agreement is
for any reason determined to be invalid or unenforceable, there shall be

                                     -27-

<PAGE>

deemed to be made such minor changes (and only such minor changes) as are
necessary to make it valid and enforceable.

         SECTION 14.  GOVERNING LAW PROVISIONS.

         (a) GOVERNING LAW. This agreement shall be governed by and construed in
accordance with the internal laws of the state of New York applicable to
agreements made and to be performed in such state.

         (b) CONSENT TO JURISDICTION. Any legal suit, action or proceeding
arising out of or based upon this Agreement or the transactions contemplated
hereby ("Related Proceedings") may be instituted in the federal courts of the
United States of America located in the State of New York (collectively, the
"Specified Courts"), and each party irrevocably submits to the exclusive
jurisdiction (except for proceedings instituted in regard to the enforcement of
a judgment of any such court (a "Related Judgment"), as to which such
jurisdiction is non-exclusive) of such courts in any such suit, action or
proceeding. Service of any process, summons, notice or document by mail to such
party's address set forth above shall be effective service of process for any
suit, action or other proceeding brought in any such court. The parties
irrevocably and unconditionally waive any objection to the laying of venue of
any suit, action or other proceeding in the Specified Courts and irrevocably and
unconditionally waive and agree not to plead or claim in any such court that any
such suit, action or other proceeding brought in any such court has been brought
in an inconvenient forum.

         (c) WAIVER OF IMMUNITY. With respect to any Related Proceeding, each
party irrevocably waives, to the fullest extent permitted by applicable law, all
immunity (whether on the basis of sovereignty or otherwise) from jurisdiction,
service of process, attachment (both before and after judgment) and execution to
which it might otherwise be entitled in the Specified Courts, and with respect
to any Related Judgment, each party waives any such immunity in the Specified
Courts or any other court of competent jurisdiction, and will not raise or claim
or cause to be pleaded any such immunity at or in respect of any such Related
Proceeding or Related Judgment, including, without limitation, any immunity
pursuant to the United States Foreign Sovereign Immunities Act of 1976, as
amended.

         SECTION 15. GENERAL PROVISIONS. This Agreement constitutes the entire
agreement of the parties to this Agreement and supersedes all prior written or
oral and all contemporaneous oral agreements, understandings and negotiations
with respect to the subject matter hereof. This Agreement may be executed in two
or more counterparts, each one of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.
This Agreement may not be amended or modified unless in writing by all of the
parties hereto, and no condition herein (express or implied) may be waived
unless waived in writing by each party whom the condition is meant to benefit.
The Table of Contents and the Section headings herein are for the convenience of
the parties only and shall not affect the construction or interpretation of this
Agreement.

         [The remainder of this page has been intentionally left blank.]

- -28-

<PAGE>

         If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Company the enclosed copies hereof,
whereupon this instrument, along with all counterparts hereof, shall become a
binding agreement in accordance with its terms.

                                            Very truly yours,

                                            IBASIS, INC.

                                            By:  /s/ Ofer Gneezy
                                                 -----------------------------
                                            Name:  Ofer Gneezy
                                                 -----------------------------
                                            Title: President and CEO
                                                 -----------------------------

         The foregoing Underwriting Agreement is hereby confirmed and accepted
by the Representatives as of the date first above written.

FLEETBOSTON ROBERTSON STEPHENS INC.
CHASE SECURITIES INC.
U.S. BANCORP PIPER JAFFRAY INC.
DAIN RAUSCHER INCORPORATED

On their behalf and on behalf of each of the several underwriters named in
SCHEDULE A hereto.

BY:      FLEETBOSTON ROBERTSON STEPHENS INC.

By:      /s/ M. Whitford
         ----------------------------------
         Authorized Signatory


<PAGE>


                                    EXHIBIT A

                            SCHEDULE OF UNDERWRITERS

- ------------------------------------------ -------------------------------------
Underwriter                                    Aggregate Principal Amount of
                                                 Firm Notes to be Purchased

- ------------------------------------------ -------------------------------------
FleetBoston Robertson Stephens Inc.                      96,375,000

- ------------------------------------------ -------------------------------------
Chase Securities Inc.                                    21,375,000

- ------------------------------------------ -------------------------------------
U.S. Bancorp. Piper Jaffrey Inc.                         21,375,000

- ------------------------------------------ -------------------------------------
Dain Rauscher Incorporated                               10,875,000

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

- ------------------------------------------ -------------------------------------
TOTAL UNDERWRITERS (__)                                 $150,000,000
- ------------------------------------------ -------------------------------------



<PAGE>

                                    EXHIBIT B

                       OPINION OF COUNSEL FOR THE COMPANY

         (1)      The Company has been duly incorporated and is validly existing
 as a corporation in good standing under the DGCL.

         (2)      The Company has the corporate power and authority to own,
lease and operate its properties and to conduct its business as described in
the Prospectus.

         (3) The Company is presently qualified to do business as a foreign
corporation in each jurisdiction within the United States in which it owns or
leases real property as described in the Registration Statement, except where
the failure to be so qualified would not have a Material Adverse Effect.

         (4) Immediately after the closing of the Offering, the authorized
capital stock of the Company will consist of (i) eighty-five million
(85,000,000) shares of common stock, $0.001 par value per share (the "COMMON
STOCK"), and (ii) fifteen million (15,000,000) shares of preferred stock, $0.001
par value per share, and there will be no shares of any other class of capital
stock authorized. All of the shares of Common Stock issued and outstanding after
the closing of the Offering will have been duly authorized and validly issued
and will be fully paid and non-assessable. The shares of Common Stock issued and
outstanding after the closing of the Offering will not have been issued in
violation of, or subject to, any preemptive right, co-sale right, registration
right, right of first refusal or other similar right provided by (A) the
Restated Charter, the By-laws, or the DGCL, or (B), to our knowledge, any
agreement or instrument to which the Company is a party or by which the Company
is bound.

          (5) The Company has the corporate power and authority to enter into
the Underwriting Agreement and the Indenture and to issue, sell and deliver to
the Underwriters the Notes to be issued and sold by the Company thereunder and
to consummate the transactions contemplated thereby.

         (6) The Underwriting Agreement has been duly authorized by all
necessary corporate action on the part of the Company and has been duly executed
and delivered by the Company and is a valid and binding agreement of the
Company, enforceable against the Company in accordance with its terms (except
that we express no opinion as to the enforceability of the indemnification and
contribution provisions of the Underwriting Agreement).

         (7) The Indenture has been duly authorized by all necessary corporate
action on the part of the Company and has been duly executed and delivered by
the Company and is a valid and binding obligation of the Company, enforceable in
accordance with its terms.

<PAGE>

BancBoston Robertson Stephens Inc.
Hambrecht & Quist LLC
U.S. Bancorp Piper Jaffray Inc.
November 16, 1999
Page 2

         (8) The Notes have been duly authorized on behalf of the Company, and
(assuming due execution, authentication, issuance and delivery as provided in
the Indenture) will constitute valid and binding obligations of the Company
entitled to the benefits of the Indenture and enforceable in accordance with
their terms; the Notes will not have been issued in violation of or subject to
any preemptive right, co-sale right, registration right, right of first refusal
or other similar right provided by (A) the Restated Charter, the By-laws, or the
DGCL, or (B), to our knowledge, any agreement or instrument to which the Company
is a party or by which the Company is bound.

         (9) The Shares initially issuable by the Company upon conversion of the
Notes have been duly authorized and reserved for issuance and, when issued and
delivered by the Company upon such conversion, will be duly and validly issued
and fully paid and nonassessable, and will not have been issued in violation of
or subject to any preemptive right, co-sale right, registration right, right of
first refusal or other similar right provided by (A) the Restated Charter, the
By-laws, or the DGCL, or (B), to our knowledge, any agreement or instrument to
which the Company is a party or by which the Company is bound.

         (10) The statements in the Prospectus under the caption "Description of
the Notes," insofar as such statements purport to summarize provisions of the
Notes and the Indenture, are accurate summaries in all material respects of the
provisions purported to be summarized therein.

         (11) The Registration Statement has become effective under the Act and,
to our knowledge, no stop order suspending the effectiveness of the Registration
Statement has been issued and no proceedings for that purpose have been
instituted or are pending or threatened under the Act.

          (12) The Registration Statement and the Prospectus (other than the
financial statements (including supporting schedules) and financial data and
information and information derived therefrom, as to which we express no
opinion), as of the effective date of the Registration Statement, complied as to
form in all material respects with the requirements of the Act and the
applicable rules and regulations promulgated thereunder.

         (13) The information in the Prospectus under the caption "Description
of Capital Stock," to the extent that it constitutes matters of law or legal
conclusions, has been reviewed by us and is a fair summary of such matters and
conclusions, provided that we give no opinion as to the number of shares of
Common Stock or preferred stock outstanding. .

         (14) The description in the Registration Statement and the Prospectus
of the Restated Charter and the By-laws under the caption "Delaware Law and
Certain Certificate of Incorporation and By-Law Provisions," to the extent that
it constitutes matters of law or legal


<PAGE>

BancBoston Robertson Stephens Inc.
Hambrecht & Quist LLC
U.S. Bancorp Piper Jaffray Inc.
November 16, 1999
Page 3

conclusions, is accurate in all material respects and fairly presents the
information with respect thereto required to be presented by the Act.

         (15) To our knowledge, there are no agreements, contracts, leases or
documents to which the Company is a party of a character required to be
described or referred to in the Registration Statement or Prospectus or to be
filed as an exhibit to the Registration Statement which are not described or
referred to therein or filed as required.

         (16) The performance of the Underwriting Agreement and the Indenture
and the consummation of the transactions contemplated therein (other than
performance of the Company's indemnification obligations thereunder, concerning
which no opinion is expressed) will not (a) result in any violation of the
Restated Charter or the By-laws or (b) to our knowledge, result in a material
breach or violation of any of the terms and provisions of, or constitute a
default under, any bond, debenture, note or other evidence of indebtedness, or
any lease, contract, indenture, mortgage, deed of trust, loan agreement, joint
venture or other agreement or instrument known to us to which the Company is a
party or by which its properties are bound, or any applicable statute, rule or
regulation known to us or, to our knowledge, any order, writ or decree of any
court, government or governmental agency or body having jurisdiction over the
Company or any of its subsidiaries, or over any of their properties or
operations (except that we express no opinion as to the Company's performance of
its obligations under the indemnification and contribution provisions of the
Underwriting Agreement, to the extent such performance may be considered to
violate securities laws or public policy).

         (17) No consent, approval, authorization or order of or qualification
with any Federal or Massachusetts court, government or governmental agency or
body having jurisdiction over the Company or any of its subsidiaries, or over
any of their properties or operations is necessary in connection with the
consummation by the Company of the transactions contemplated under the
Underwriting Agreement or the Indenture, except (i) such as have been obtained
under the Act, the Exchange Act or the Trust Indenture Act of 1939, (ii) such as
may be required under state or other securities or Blue Sky laws in connection
with the purchase and the distribution of the Shares by the Underwriters, or
(iii) such as may be required by the National Association of Securities Dealers,
LLC.

         (18) To our knowledge, there are no legal or governmental proceedings
pending or overtly threatened against the Company or any of its subsidiaries of
a character required to be disclosed in the Registration Statement or the
Prospectus by the Act, other than those described therein.

         (19) To our knowledge, except as referred to in the Registration
Statement and Prospectus, no holders of any shares of Common Stock or other
securities of the Company have

<PAGE>

BancBoston Robertson Stephens Inc.
Hambrecht & Quist LLC
U.S. Bancorp Piper Jaffray Inc.
November 16, 1999
Page 4

registration rights with respect to securities of the Company and, except as
referred to in the Registration Statement and Prospectus, all holders of
securities of the Company having rights known to us to the registration of such
shares of Common Stock or other securities because of the filing of the
Registration Statement by the Company have, with respect to the offering
contemplated thereby, waived such rights or such rights have expired by reason
of lapse of time following notification of the Company's intent to file the
Registration Statement.

         (20) The Company is not and, after giving effect to the offering and
the sale of the Shares and the application of the proceeds thereof as described
in the Prospectus, will not be, an "investment company" as such term is defined
in the Investment Company Act of 1940, as amended.

                                       ***

         In addition, we have participated in certain conferences with officers
and other representatives of the Company and representatives of the independent
accountants of the Company, at which conferences the contents of the
Registration Statement and Prospectus and related matters were discussed and,
although we do not assume any responsibility for the accuracy, completeness or
fairness of the statements contained in the Registration Statement or the
Prospectus, no facts have come to our attention that have caused us to believe
that, as of its effective date, the Registration Statement (other than the
financial statements and related schedules and other financial and statistical
data therein, as to which we express no view) contained an untrue statement of a
material fact or omitted to state a material fact required to be stated therein
or necessary to make the statements therein not misleading or that, as of its
date, the Prospectus (other than the financial statements and related schedules
and other financial and statistical data therein, as to which we express no
view) contained an untrue statement of a material fact or omitted to state a
material fact necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading or that, as of the date
hereof, as applicable, either the Registration Statement or the Prospectus
(other than the financial statements and related schedules and other financial
and statistical data therein, as to which we express no view) contains an untrue
statement of a material fact or omits to state a material fact necessary to make
the statements therein, in the light of the circumstances under which they were
made, not misleading.


<PAGE>


                                    EXHIBIT C

            OPINION OF GOVERNMENT REGULATION COUNSEL FOR THE COMPANY

1. The statements in the Registration Statement under the captions "Risk Factors
- - Risk related to the Internet and Internet Telephony Industry" and "Business -
Government Regulation" (to the extent that the discussion in these sections
pertains to the Telecommunications Laws), insofar as such statements constitute
a summary of the legal matters, documents or proceedings pertaining to the
Companies, fairly summarize such matters referred to therein.


<PAGE>


                                    EXHIBIT D

                     OPINION OF COUNSEL FOR THE UNDERWRITERS

         1. The Notes to be issued by the Company have been duly authorized and
(assuming due execution, authentication, issuance and delivery as provided in
the Indenture) will constitute valid and binding obligations of the Company
entitled to the benefits of the Indenture and enforceable in accordance with
their terms.

         2. The Registration Statement complied as to form in all material
respects with the requirements of the Act; the Registration Statement has become
effective under the Act and, to our knowledge, no stop order proceedings with
respect thereto have been instituted or threatened or are pending under the Act.

         3. The Underwriting Agreement and the Indenture have been duly
authorized, executed and delivered by the Company.

         In connection with the preparation of the Registration Statement and
the Prospectus, we have participated in conferences with officers and
representatives of the Company, counsel for the Company and the independent
accountants of the Company, at which conferences we made inquiries of such
officers, representatives and others and discussed the contents of the
Registration Statement and the Prospectus. While the limitations inherent in the
independent verification of factual matters and the character of determinations
involved in the registration process are such that we are not passing upon and
do not assume any responsibility for the accuracy, completeness or fairness of
the statements contained in the Registration Statement or the Prospectus, based
on such participation, inquiries and discussion, no facts have come to our
attention that would lead us to believe that the Registration Statement (except
for financial statements, schedules, and other financial information contained
therein or omitted therefrom, as to which we express no belief) at the time it
became effective (but after giving effect to changes incorporated pursuant to
Rule 430A under the Act) contained any untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary to
make the statements therein not misleading, or that the Registration Statement,
the Prospectus and any amendment or supplement thereto (except for financial
statements, schedules and other financial information contained therein or
omitted therefrom, as to which we express no belief), as of the date thereof or
as of the date of this opinion, contained any untrue statement of a material
fact or omitted to state a material fact necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading.

<PAGE>

                                                                  EXHIBIT 4.1

         INDENTURE dated as of March 15, 2000 between IBASIS, INC., a
Delaware corporation (hereinafter sometimes called the "Company", as more fully
set forth in Section 1.1), and The Bank of New York, a New York banking
corporation, as trustee (hereinafter sometimes called the "Trustee", as more
fully set forth in Section 1.1).

                              W I T N E S S E T H:

         WHEREAS, for its lawful corporate purposes, the Company has duly
authorized the issue of its 5 3/4% Convertible Subordinated Notes due 2005
(hereinafter sometimes called the "Notes"), in an aggregate principal amount not
to exceed $150,000,000 ($172,500,000 if the over-allotment option is exercised
in full) and to provide the terms and conditions upon which the Notes are to be
authenticated, issued and delivered, the Company has duly authorized the
execution and delivery of this Indenture; and

         WHEREAS, the Notes, the certificate of authentication to be borne by
the Notes, a form of assignment, a form of option to elect repayment upon a
Repurchase Event, a form of conversion notice and a certificate of transfer to
be borne by the Notes are to be substantially in the forms hereinafter provided
for; and

         WHEREAS, all acts and things necessary to make the Notes, when executed
by the Company and authenticated and delivered by the Trustee or a duly
authorized authenticating agent, as in this Indenture provided, the valid,
binding and legal obligations of the Company, and to constitute these presents a
valid agreement according to its terms, have been done and performed, and the
execution of this Indenture and the issue hereunder of the Notes have in all
respects been duly authorized.

         NOW, THEREFORE, THIS INDENTURE WITNESSETH:

         That in order to declare the terms and conditions upon which the Notes
are, and are to be, authenticated, issued and delivered, and in consideration of
the premises and of the purchase and acceptance of the Notes by the holders
thereof, the Company covenants and agrees with the Trustee for the equal and
proportionate benefit of the respective holders from time to time of the Notes
(except as otherwise provided below), as follows:


                                       1
<PAGE>

                                   ARTICLE 1.

                                   DEFINITIONS

         Section 1.1. DEFINITIONS. The terms defined in this Section 1.1 (except
as herein otherwise expressly provided or unless the context otherwise requires)
for all purposes of this Indenture and of any indenture supplemental hereto
shall have the respective meanings specified in this Section 1.1. All other
terms used in this Indenture, which are defined in the Trust Indenture Act or
which are by reference therein defined in the Securities Act (except as herein
otherwise expressly provided or unless the context otherwise requires) shall
have the meanings assigned to such terms in said Trust Indenture Act and in said
Securities Act as in force at the date of the execution of this Indenture. The
words "herein," "hereof," "hereunder," and words of similar import refer to this
Indenture as a whole and not to any particular Article, Section or other
Subdivision. The terms defined in this Article include the plural as well as the
singular.

         AFFILIATE: The term "Affiliate" of any specified person shall mean any
other person directly or indirectly controlling or controlled by or under direct
or indirect common control with such specified person. For the purposes of this
definition, "control," when used with respect to any specified person means the
power to direct or cause the direction of the management and policies of such
person, directly or indirectly, whether through the ownership of voting
securities, by contract or otherwise; and the terms "controlling" and
"controlled" have meanings correlative to the foregoing.

         BOARD OF DIRECTORS: The term "Board of Directors" shall mean the Board
of Directors of the Company or a committee of such Board duly authorized to act
for it hereunder.

         BOARD RESOLUTION: The term "Board Resolution" means a copy of a
resolution certified by the Secretary or an Assistant Secretary of the Company
to have been duly adopted by the Board of Directors, or duly authorized
committee thereof (to the extent permitted by applicable law), and to be in full
force and effect on the date of such certification, and delivered to the
Trustee.

         BUSINESS DAY: The term "Business Day" means each Monday, Tuesday,
Wednesday, Thursday and Friday which is not a day on which the banking
institutions in The City of New York or the city in which the Corporate Trust
Office is located are authorized or obligated by law or executive order to close
or be closed.

         CHANGE IN CONTROL: The term "Change in Control" shall have the meaning
specified in Section 16.4.

         CLOSE OF BUSINESS: The term "close of business" means 5 p.m. (New York
City time).

         COMMISSION: The term "Commission" shall mean the Securities and
Exchange Commission.


                                       2
<PAGE>

         COMMON STOCK: The term "Common Stock" shall mean any stock of any class
of the Company which has no preference in respect of dividends or of amounts
payable in the event of any voluntary or involuntary liquidation, dissolution or
winding up of the Company and which is not subject to redemption by the Company.
Subject to the provisions of Section 15.6, however, shares issuable on
conversion of Notes shall include only shares of the class designated as common
stock of the Company at the date of this Indenture or shares of any class or
classes resulting from any reclassification or reclassifications thereof and
which have no preference in respect of dividends or of amounts payable in the
event of any voluntary or involuntary liquidation, dissolution or winding up of
the Company and which are not subject to redemption by the Company; PROVIDED
that if at any time there shall be more than one such resulting class, the
shares of each such class then so issuable shall be substantially in the
proportion which the total number of shares of such class resulting from all
such reclassifications bears to the total number of shares of all such classes
resulting from all such reclassifications.

         COMPANY: The term "Company" shall mean iBasis, Inc., a Delaware
corporation, and subject to the provisions of Article 12, shall include its
successors and assigns.

         CONVERSION PRICE: The term "Conversion Price" shall have the meaning
specified in Section 15.4.

         CORPORATE TRUST OFFICE: The term "Corporate Trust Office," or other
similar term, shall mean the office of the Trustee at which at any particular
time its corporate trust business shall be principally administered, which
office is, at the date as of which this Indenture is dated, located at [101
Barclay Street, 21W, New York, New York 10286], Attention: Corporate Trust
Administration (iBasis 5 3/4% Convertible Subordinated Notes due 2005).

         CUSTODIAN: The term "Custodian" means the custodian with respect to
respect to the Notes in global form (as appointed by DTC), or any successor
person thereto and shall initially be the Trustee.

         DEFAULT: The term "default" shall mean any event that is, or after
notice or passage of time, or both, would be, an Event of Default.

         DEPOSITARY: The term "Depositary" means, with respect to the Notes
issuable or issued in whole or in part in global form, the person specified in
Section 2.5(d) as the Depositary with respect to such Notes, until a successor
shall have been appointed and become such pursuant to the applicable provisions
of this Indenture, and thereafter, "Depositary" shall mean or include such
successor.

         DESIGNATED SENIOR INDEBTEDNESS: The term "Designated Senior
Indebtedness" means the Company's obligations under any particular Senior
Indebtedness in which the instrument creating or evidencing the same or the
assumption or guarantee thereof (or related agreements or documents to which the
Company is a party) expressly provides that such Senior Indebtedness


                                       3
<PAGE>

shall be "Designated Senior Indebtedness" for purposes of this Indenture
(provided that such instrument, agreement or other document may place
limitations and conditions on the right of such Senior Indebtedness to exercise
the rights of Designated Senior Indebtedness).

         EVENT OF DEFAULT: The term "Event of Default" shall mean any event
specified in Section 7.1, continued for the period of time, if any, and after
the giving of notice, if any, therein designated.

         EXCHANGE ACT: The term "Exchange Act" means the Securities Exchange Act
of 1934, as amended, and the rules and regulations promulgated thereunder.

         EXPIRATION TIME: The term "Expiration Time" shall have the meaning
specified in Section 15.5(f).

         GLOBAL NOTE: The term "Global Note" shall have the meaning specified in
Section 2.5(b).

         INDEBTEDNESS: The term "Indebtedness" shall mean any obligations of, or
guaranteed or assumed by, the Company or any Significant Subsidiary for borrowed
money.

         INDENTURE: The term "Indenture" shall mean this instrument as
originally executed or, if amended or supplemented as herein provided, as so
amended or supplemented.

         NOTE OR NOTES: The terms "Note" or "Notes" shall mean any Note or
Notes, as the case may be, authenticated and delivered under this Indenture.

         NOTEHOLDER, HOLDER OR HOLDER: The terms "Noteholder", "Holder" or
"holder" as applied to any Note, or other similar terms (but excluding the term
"beneficial holder"), shall mean any person in whose name at the time a
particular Note is registered on the Note register.

         NOTE REGISTER: The term "Note register" shall have the meaning
specified in Section 2.5.

         OFFICERS' CERTIFICATE: The term "Officers' Certificate", when used with
respect to the Company, shall mean a certificate signed by (a) one of the
President, the Chief Executive Officer, Executive Vice President or any Vice
President (whether or not designated by a word or words added after the title
"Vice President") and (b) by one of the Treasurer or any Assistant Treasurer,
Secretary or any Assistant Secretary or Controller of the Company, which is
delivered to the Trustee. Each such certificate shall include the statements
provided for in Section 17.5 if and to the extent required by the provisions of
such Section.

         OPINION OF COUNSEL: The term "Opinion of Counsel" shall mean an opinion
in writing signed by legal counsel, who may be an employee of or counsel to the
Company, or other counsel acceptable to the Trustee, which is delivered to the
Trustee. Each such opinion shall


                                       4
<PAGE>

include the statements provided for in Section 17.5 if and to the extent
required by the provisions of such Section.

         OUTSTANDING: The term "outstanding," when used with reference to Notes,
shall, subject to the provisions of Section 9.4, mean, as of any particular
time, all Notes authenticated and delivered by the Trustee under this Indenture,
except:

         (a) Notes theretofore canceled by the Trustee or delivered to the
Trustee for cancellation;

         (b) Notes, or portions thereof, for the payment, or redemption of which
monies in the necessary amount shall have been deposited in trust with the
Trustee or with any paying agent (other than the Company) or shall have been set
aside and segregated in trust by the Company (if the Company shall act as its
own paying agent); PROVIDED that if such Notes are to be redeemed, as the case
may be, prior to the maturity thereof, notice of such redemption shall have been
given as provided in Section 3.2, or provision satisfactory to the Trustee shall
have been made for giving such notice;

         (c) Notes in lieu of which, or in substitution for which, other Notes
shall have been authenticated and delivered pursuant to the terms of Section 2.6
unless proof satisfactory to the Trustee is presented that any such Notes are
held by bona fide holders in due course; and

         (d) Notes converted into Common Stock pursuant to Article 15 and Notes
deemed not outstanding pursuant to Section 3.2.

         PERSON OR PERSON: The term "person" or "Person" shall mean an
individual, a corporation, a limited liability company, an association, a
partnership, an individual, a joint venture, a joint stock company, a trust, an
unincorporated organization or a government or an agency or a political
subdivision thereof.

         PREDECESSOR NOTE: The term "Predecessor Note" of any particular Note
shall mean every previous Note evidencing all or a portion of the same debt as
that evidenced by such particular Note; and, for the purposes of this
definition, any Note authenticated and delivered under Section 2.6 in lieu of a
lost, destroyed or stolen Note shall be deemed to evidence the same debt as the
lost, destroyed or stolen Note that it replaces.

         REPURCHASE EVENT: The term "Repurchase Event" shall have the meaning
specified in Section 16.4.

         REPURCHASE PRICE: The term "Repurchase Price" has the meaning specified
in Section 16.1.


                                       5
<PAGE>

         RESPONSIBLE OFFICER: The term "Responsible Officer", when used with
respect to the Trustee, shall mean an officer of the Trustee in the Corporate
Trust Office assigned and duly authorized by the Trustee to administer its
obligations under this Indenture.

         SECURITIES ACT: The term "Securities Act" means the Securities Act of
1933, as amended, and the rules and regulations promulgated thereunder.

         SENIOR INDEBTEDNESS: The term "Senior Indebtedness" means the principal
of, premium, if any, interest on (including any interest accruing after the
filing of a petition by or against the Company under any bankruptcy law, whether
or not allowed as a claim after such filing in any proceeding under such
bankruptcy law) and any other payment due pursuant to, any of the following,
whether outstanding on the date of this Indenture or thereafter incurred or
created:

                  (a) All indebtedness of the Company for money borrowed that is
         evidenced by notes, debentures, bonds or other securities (including,
         but not limited to, those which are convertible or exchangeable for
         securities of the Company);

                  (b) All indebtedness of the Company due and owing with respect
         to letters of credit (including, but not limited to, reimbursement
         obligations with respect thereto), bankers' guarantees or bankers'
         acceptances;

                  (c) All indebtedness or other obligations of the Company due
         and owing with respect to interest rate and currency swap agreements,
         cap, floor and collar agreements, currency spot and forward contracts
         and other similar agreements and arrangements;

                  (d) All indebtedness consisting of commitment or standby fees
         due and payable to lending institutions with respect to credit
         facilities or letters of credit available to the Company;

                  (e) All obligations of the Company under leases required or
         permitted to be capitalized under generally accepted accounting
         principles;

                  (f) All indebtedness or obligations of others of the kinds
         described in any of the preceding clauses (a), (b), (c), (d) or (e)
         assumed by or guaranteed in any manner by the Company or in effect
         guaranteed (directly or indirectly) by the Company through an agreement
         to purchase, contingent or otherwise, and all obligations of the
         Company under any such guarantee or other arrangements; and

                  (g) All renewals, extensions, refundings, deferrals,
         amendments or modifications of indebtedness or obligations of the kinds
         described in any of the preceding clauses (a), (b), (c), (d), (e) or
         (f);

unless in the case of any particular indebtedness, obligation, renewal,
extension, refunding, amendment, modification or supplement, the instrument or
other document creating or


                                       6
<PAGE>

evidencing the same or the assumption or guarantee of the same expressly
provides that such indebtedness, obligation, renewal, extension, refunding,
amendment, modification or supplement is subordinate to, or is not superior to,
or is PARI PASSU with, the Notes; PROVIDED that Senior Indebtedness shall not
include (i) any indebtedness of any kind of the Company to any subsidiary of the
Company, a majority of the voting stock of which is owned, directly or
indirectly, by the Company, (ii) indebtedness for trade payables or constituting
the deferred purchase price of assets or services incurred in the ordinary
course of business, or (iii) the Notes.

         SIGNIFICANT SUBSIDIARY: The term "Significant Subsidiary" means, with
respect to any person, a Subsidiary of such person that would constitute a
"significant subsidiary" as such term is defined under Rule 1-02 of Regulation
S-X of the Securities and Exchange Commission.

         SUBSIDIARY: The term "Subsidiary" means a corporation more than 50% of
the outstanding voting stock of which is owned, directly or indirectly, by the
Company or by one or more other Subsidiaries, or by the Company and one or more
other Subsidiaries. For the purposes of this definition, "voting stock" means
stock which ordinarily has voting power for the election of directors, whether
at all times or only so long as no senior class of stock has such voting power
by reason of any contingency.

         TRADING DAY: The term "Trading Day" has the meaning specified in
Section 15.5(h)(5).

         TRUST INDENTURE ACT: The term "Trust Indenture Act" shall mean the
Trust Indenture Act of 1939, as amended, as it was in force at the date of
execution of this Indenture, except as provided in Sections 11.3 and 15.6;
PROVIDED, HOWEVER, that in the event the Trust Indenture Act of 1939 is amended
after the date hereof, the term "Trust Indenture Act" shall mean, to the extent
required by such amendment, the Trust Indenture Act of 1939 as so amended.

         TRUSTEE: The term "Trustee" shall mean [The Bank of New York], and its
successors and any corporation resulting from or surviving any consolidation or
merger to which it or its successors may be a party and any successor trustee at
the time serving as successor trustee hereunder.

         The definitions of certain other terms are contained herein, including
those specified in Article 15 and Article 16.


                                       7
<PAGE>

                                   ARTICLE 2.

        ISSUE, DESCRIPTION, EXECUTION, REGISTRATION AND EXCHANGE OF NOTES

         Section 2.1. DESIGNATION, AMOUNT AND ISSUE OF NOTES. The Notes shall
be designated as "5 3/4% Convertible Subordinated Notes due 2005." Notes not to
exceed the aggregate principal amount of $150,000,000 (or $172,500,000 if the
over-allotment option set forth in Section 2(c) of the Underwriting Agreement
dated March 9, 2000, as amended from time to time by the parties
thereto), by and among the Company and the Underwriters is exercised in
full) upon the execution of this Indenture, or (except pursuant to Sections 2.5,
2.6, 3.3, 15.2 and 16.2) from time to time thereafter, may be executed by the
Company and delivered to the Trustee for authentication, and the Trustee shall
thereupon authenticate and deliver said Notes upon the written order of the
Company, signed by the Company's (a) President, Executive Vice President or any
Vice President (whether or not designated by a word or words added after the
title "Vice President") and (b) Treasurer or Assistant Treasurer or its
Secretary or any Assistant Secretary, without any further action by the Company
hereunder other than the provision to the Trustee of an Officer's Certificate
and Opinion of Counsel.

         Section 2.2. FORM OF NOTES. The Notes and the Trustee's certificate of
authentication to be borne by such Notes shall be substantially in the form set
forth in Exhibit A, which is incorporated in and made a part of this Indenture.

         Any of the Notes may have such letters, numbers or other marks of
identification and such notations, legends and endorsements as the officers
executing the same may approve (execution thereof to be conclusive evidence of
such approval) and as are not inconsistent with the provisions of this
Indenture, or as may be required to comply with any law or with any rule or
regulation made pursuant thereto or with any rule or regulation of any
securities exchange or automated quotation system on which the Notes may be
listed or designated for issuance, or to conform to usage.

         The Global Note shall represent such of the outstanding Notes as shall
be specified therein and shall provide that it shall represent the aggregate
amount of outstanding Notes from time to time endorsed thereon and that the
aggregate amount of outstanding Notes represented thereby may from time to time
be increased or reduced to reflect transfers or exchanges permitted hereby. Any
endorsement of the Global Note to reflect the amount of any increase or decrease
in the amount of outstanding Notes represented thereby shall be made by the
Trustee or the Custodian, at the direction of the Trustee, in such manner and
upon instructions given by the holder of such Notes in accordance with this
Indenture. Payment of principal of and interest and premium, if any (including
any redemption price), on the Global Note shall be made to the holder of such
Note.

         The terms and provisions contained in the form of Note attached as
Exhibit A hereto shall constitute, and is hereby expressly made, a part of this
Indenture and to the extent applicable, the


                                       8
<PAGE>

Company and the Trustee, by their execution and delivery of this Indenture,
expressly agree to such terms and provisions and to be bound thereby.

         Section 2.3. DATE AND DENOMINATION OF NOTES; PAYMENTS OF INTEREST. The
Notes shall be issuable in registered form without coupons in denominations of
$1,000 principal amount and integral multiples thereof. Every Note shall be
dated the date of its authentication, and shall bear interest from the
applicable date and accrued interest shall be payable March 15 and
September 15, commencing September 15, 2000 as specified on the face of the form
of Note, attached as Exhibit A hereto.

         The person in whose name any Note (or its Predecessor Note) is
registered at the close of business on any record date with respect to any
interest payment date (including any Note that is converted after the record
date and on or before the interest payment date) shall be entitled to receive
the interest payable on such interest payment date notwithstanding the
cancellation of such Note upon any transfer, exchange or conversion subsequent
to the record date and on or prior to such interest payment date. Interest may,
at the option of the Company, be paid by check mailed to the address of such
person on the Note registry; PROVIDED that, with respect to any holder of Notes
with an aggregate principal amount equal to or in excess of $2,000,000, at the
request of such holder in writing to the Company, interest on such holder's
Notes shall be paid by wire transfer in immediately available funds in
accordance with the wire transfer instruction supplied by such holder from time
to time to the Trustee and paying agent (if different from Trustee) at least two
days prior to the applicable record date. The term "record date" with respect to
any interest payment date shall mean the March 1 or September 1 preceding
said March 15 or September 15, respectively.

         Interest on the Notes shall be computed on the basis of a 360-day year
comprised of twelve 30-day months compounded semi-annually.

         Any interest on any Note which is payable, but is not punctually paid
or duly provided for, on any said March 15 or September 15 (herein called
"Defaulted Interest") shall forthwith cease to be payable to the Noteholder on
the relevant record date by virtue of his having been such Noteholder; and such
Defaulted Interest shall be paid by the Company, at its election in each case,
as provided in clause (1) or (2) below:

                  (1) The Company may elect to make payment of any Defaulted
         Interest to the persons in whose names the Notes (or their respective
         Predecessor Notes) are registered at the close of business on a special
         record date for the payment of such Defaulted Interest, which shall be
         fixed in the following manner. The Company shall notify the Trustee in
         writing of the amount of Defaulted Interest to be paid on each Note and
         the date of the payment (which shall be not less than twenty-five (25)
         days after the receipt by the Trustee of such notice, unless the
         Trustee shall consent to an earlier date), and at the same time the
         Company shall deposit with the Trustee an amount of money equal to the
         aggregate amount to be paid in respect of such Defaulted Interest or
         shall make arrangements satisfactory to the Trustee for such deposit
         prior to the date of the proposed


                                       9
<PAGE>

         payment, such money when deposited to be held in trust for the benefit
         of the persons entitled to such Defaulted Interest as in this clause
         provided. Thereupon the Trustee shall fix a special record date for the
         payment of such Defaulted Interest which shall be not more than fifteen
         (15) days and not less than ten (10) days prior to the date of the
         proposed payment and not less than ten (10) days after the receipt by
         the Trustee of the notice of the proposed payment. The Trustee shall
         promptly notify the Company of such special record date and, in the
         name and at the expense of the Company, shall cause notice of the
         proposed payment of such Defaulted Interest and the special record date
         therefor to be mailed, first-class postage prepaid, to each Noteholder
         as of such special record date at his address as it appears in the Note
         register, not less than ten (10) days prior to such special record
         date. Notice of the proposed payment of such Defaulted Interest and the
         special record date therefor having been so mailed, such Defaulted
         Interest shall be paid to the persons in whose names the Notes (or
         their respective Predecessor Notes) were registered at the close of
         business on such special record date and shall no longer be payable
         pursuant to the following clause (2).

                  (2) The Company may make payment of any Defaulted Interest in
         any other lawful manner not inconsistent with the requirements of any
         securities exchange or automated quotation system on which the Notes
         may be listed or designated for issuance, and upon such notice as may
         be required by such exchange or automated quotation system, if, after
         notice given by the Company to the Trustee of the proposed payment
         pursuant to this clause, such manner of payment shall be deemed
         practicable by the Trustee.

         Section 2.4. EXECUTION OF NOTES. The Notes shall be signed in the name
and on behalf of the Company by either the facsimile or manual signature of its
President, its Chief Executive Officer, any of its Executive or Senior Vice
Presidents, or any of its Vice Presidents (whether or not designated by a number
or numbers or word or words added before or after the title "Vice President")
and attested by either the manual or facsimile signature of its Secretary or any
of its Assistant Secretaries (which may be printed, engraved or otherwise
reproduced thereon, by facsimile or otherwise). Only such Notes as shall bear
thereon a certificate of authentication substantially in the form set forth on
the form of Note attached as Exhibit A hereto, manually executed by the Trustee
(or an authenticating agent appointed by the Trustee as provided by Section
17.11), shall be entitled to the benefits of this Indenture or be valid or
obligatory for any purpose. Such certificate by the Trustee (or such an
authenticating agent) upon any Note executed by the Company shall be conclusive
evidence that the Note so authenticated has been duly authenticated and
delivered hereunder and that the holder is entitled to the benefits of this
Indenture.

         In case any officer of the Company who shall have signed any of the
Notes shall cease to be such officer before the Notes so signed shall have been
authenticated and delivered by the Trustee, or disposed of by the Company, such
Notes nevertheless may be authenticated and delivered or disposed of as though
the person who signed such Notes had not ceased to be such officer of the
Company; and any Note may be signed on behalf of the Company by such persons


                                       10
<PAGE>

as, at the actual date of the execution of such Note, shall be the proper
officers of the Company, although at the date of the execution of this Indenture
any such person was not such an officer.

         Section 2.5. EXCHANGE AND REGISTRATION OF TRANSFER OF NOTES;
         DEPOSITARY.

         (a) (1) The Company shall cause to be kept at the Corporate Trust
Office a register (the register maintained in such office and in any other
office or agency of the Company designated pursuant to Section 5.2 being herein
sometimes collectively referred to as the "Note register") in which, subject to
such reasonable regulations as it may prescribe, the Company shall provide for
the registration of Notes and of transfers of Notes. Such register shall be in
written form or in any form capable of being converted into written form within
a reasonable period of time. The Trustee is hereby appointed "Note registrar"
for the purpose of registering Notes and transfers of Notes as herein provided.
The Company may appoint one or more co-registrars in accordance with Section
5.2.

               (2) Upon surrender for registration of transfer of any Note to
         the Note registrar or any co-registrar, and satisfaction of the
         requirements for such transfer set forth in this Section 2.5, the
         Company shall execute, and the Trustee shall authenticate and deliver,
         in the name of the designated transferee or transferees, one or more
         new Notes of any authorized denominations and of a like aggregate
         principal amount and bearing such restrictive legends as may be
         required by this Indenture.

               (3) Notes may be exchanged for other Notes of any authorized
         denominations and of a like aggregate principal amount, upon surrender
         of the Notes to be exchanged at any such office or agency. Whenever any
         Notes are so surrendered for exchange, the Company shall execute, and
         the Trustee shall authenticate and deliver, the Notes which the
         Noteholder making the exchange is entitled to receive, bearing
         registration numbers not contemporaneously outstanding.

               (4) All Notes presented or surrendered for registration of
         transfer or for exchange shall (if so required by the Company, the
         Trustee, the Note registrar or any co-registrar) be duly endorsed, or
         be accompanied by a written instrument or instruments of transfer in
         form satisfactory to the Company and duly executed, by the Noteholder
         thereof or his attorney-in-fact duly authorized in writing.

               (5) No service charge shall be charged to the Noteholder for any
         exchange or registration of transfer of Notes, but the Company may
         require payment of a sum sufficient to cover any tax, assessments or
         other governmental charges that may be imposed in connection therewith
         other than stamp or other duties imposed with respect to the issuance
         of the Notes, which shall be paid by the Company.

               (6) None of the Company, the Trustee, the Note registrar or any
         co-registrar shall be required to exchange or register a transfer of
         (a) any Notes for a period of fifteen (15) days next preceding any
         selection of Notes to be redeemed or (b) any Notes called


                                       11
<PAGE>

         for redemption or, if a portion of any Note is selected or called for
         redemption, such portion thereof selected or called for redemption or
         (c) any Notes surrendered for conversion or, if a portion of any Note
         is surrendered for conversion, such portion thereof surrendered for
         conversion or (d) any Notes, or a portion of any Note, surrendered for
         repurchase (and not withdrawn) in connection with a Repurchase Event.

               (7) All Notes issued upon any transfer or exchange of Notes in
         accordance with this Indenture shall be the valid obligations of the
         Company, evidencing the same debt, and entitled to the same benefits
         under this Indenture as the Notes surrendered upon such registration of
         transfer or exchange.

         (b) So long as the Notes are eligible for book-entry settlement with
the Depositary, unless otherwise required by law, all Notes shall be represented
by a Note in global form (the "Global Note") registered in the name of the
Depositary or the nominee of the Depositary. The transfer and exchange of
beneficial interests in the Global Note shall be effected through the Depositary
(but not the Trustee or the Custodian) in accordance with this Indenture
(including the restrictions on transfer set forth herein) and the procedures of
the Depositary therefor.

         (c) Reserved.

         (d) (1) Notwithstanding any other provisions of this Indenture (other
than the provisions set forth in this Section 2.5(d)), the Global Note may not
be transferred as a whole or in part except by the Depositary to a nominee of
the Depositary or by a nominee of the Depositary to the Depositary or another
nominee of the Depositary or by the Depositary or any such nominee to a
successor Depositary or a nominee of such successor Depositary.

               (2) The Depositary shall be a clearing agency registered under
         the Exchange Act. The Company initially appoints The Depository Trust
         Company to act as Depositary with respect to the Global Note.
         Initially, the Global Note shall be issued to the Depositary,
         registered in the name of Cede & Co., as the nominee of the Depositary,
         and deposited with the Trustee as custodian for Cede & Co.

               (3) If (i) the Depositary notifies the Company that it is
         unwilling or unable to continue as, or ceases to be, a clearing agency
         registered under Section 17A of the Exchange Act and a successor to the
         Depositary registered as a clearing agency under Section 17A of the
         Exchange Act is not able to be appointed by the Company within 90
         calendar days, or (ii) the Depositary is at any time unwilling or
         unable to continue as Depositary and a successor to the Depositary is
         not able to be appointed by the Company within 90 calendar days, or
         (iii) the Company, at its option, notifies the Trustee in writing that
         it elects to cause the issuance of Notes in the form of definitive
         Notes, the Company shall issue notes in denominations of $1,000 or an
         integral multiple thereof to all beneficial owners of the Global Note
         in exchange for their beneficial interests therein. If an Event of
         Default occurs and is continuing, the Company shall, at the request of
         the Noteholder thereof, exchange all or part of the Global Note for one
         or more definitive


                                       12
<PAGE>

         Notes; PROVIDED that the principal amount of each of such definitive
         Note and such Global Note, after such exchange, shall be $1,000.00 or
         an integral multiple thereof. Whenever a Global Note is exchanged as a
         whole for one or more definitive Notes it shall be surrendered by the
         holder thereof to the Trustee for cancellation.

               (4) If a Note in definitive form is issued in exchange for any
         portion of a Global Note after the close of business on any record date
         at the office or agency where such exchange occurs and before the
         opening of business at such office or agency on the next succeeding
         interest payment date, interest will not be payable on such interest
         payment date in respect of such definitive Note, but will be payable on
         such interest payment date only with respect to the exchanged portion
         of the Global Note in accordance with the provisions of this Indenture.

               (5) Definitive Notes issued in exchange for all or a part of the
         Global Note pursuant to this Section 2.5(d) shall be registered in such
         names and in such authorized denominations as the Depositary, pursuant
         to instructions from its direct or indirect participants or otherwise,
         shall instruct the Trustee. Upon execution and authentication, the
         Trustee shall deliver such definitive Notes to the persons in whose
         names such definitive Notes are so registered.

               (6) At such time as all interests in the Global Note have been
         redeemed, converted, canceled, repurchased or transferred, the Global
         Note shall be, upon receipt thereof, canceled by the Trustee in
         accordance with standing procedures and instructions existing between
         the Depositary and the Custodian. At any time prior to such
         cancellation, if any interest in the Global Note is exchanged for
         definitive Notes, redeemed, converted, canceled, repurchased or
         transferred to a transferee who receives definitive Notes therefor or
         any definitive Note is exchanged or transferred for part of the Global
         Note, the principal amount of the Global Note shall, in accordance with
         the standing procedures and instructions existing between the
         Depositary and the Custodian, be appropriately reduced or increased, as
         the case may be, and an endorsement shall be made on the Global Note,
         by the Trustee or the Custodian, at the direction of the Trustee, to
         reflect such reduction or increase.

         Section 2.6. MUTILATED, DESTROYED, LOST OR STOLEN NOTES.

         (a) In case any Note shall become mutilated or be destroyed, lost or
stolen, the Company in its discretion may execute, and upon its request the
Trustee or an authenticating agent appointed by the Trustee shall authenticate
and deliver, a new Note, bearing a number not contemporaneously outstanding, in
exchange and substitution for the mutilated Note, or in lieu of and in
substitution for the Note so destroyed, lost or stolen. In every case the
applicant for a substituted Note shall furnish to the Company, to the Trustee
and, if applicable, to such authenticating agent such security or indemnity as
may be required by them to save each of them harmless for any loss, liability,
cost or expense caused by or connected with such substitution, and, in every
case of destruction, loss or theft, the applicant shall also furnish to the
Company, to


                                       13
<PAGE>

the Trustee and, if applicable, to such authenticating agent evidence to their
satisfaction of the destruction, loss or theft of such Note and of the ownership
thereof.

         (b) The Trustee or such authenticating agent may authenticate any such
substituted Note and deliver the same upon the receipt of such security or
indemnity as the Trustee, the Company and, if applicable, such authenticating
agent may require. Upon the issuance of any substituted Note, the Company may
require the payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses connected
therewith. In case any Note which has matured or is about to mature or has been
called for redemption or is about to be converted into Common Stock shall become
mutilated or be destroyed, lost or stolen, the Company may, instead of issuing a
substitute Note, pay or authorize the payment of or convert or authorize the
conversion of the same (without surrender thereof except in the case of a
mutilated Note), as the case may be, if the applicant for such payment or
conversion shall furnish to the Company, to the Trustee and, if applicable, to
such authenticating agent such security or indemnity as may be required by them
to save each of them harmless for any loss, liability, cost or expense caused by
or connected with such substitution, and, in case of destruction, loss or theft,
evidence satisfactory to the Company, the Trustee and, if applicable, any paying
agent or conversion agent of the destruction, loss or theft of such Note and of
the ownership thereof.

         (c) Every substitute Note issued pursuant to the provisions of this
Section 2.6 by virtue of the fact that any Note is destroyed, lost or stolen
shall constitute an additional contractual obligation of the Company, whether or
not the destroyed, lost or stolen Note shall be found at any time, and shall be
entitled to all the benefits of (but shall be subject to all the limitations set
forth in) this Indenture equally and proportionately with any and all other
Notes duly issued hereunder. To the extent permitted by law, all Notes shall be
held and owned upon the express condition that the foregoing provisions are
exclusive with respect to the replacement or payment or conversion of mutilated,
destroyed, lost or stolen Notes and shall preclude any and all other rights or
remedies notwithstanding any law or statute existing or hereafter enacted to the
contrary with respect to the replacement or payment or conversion of negotiable
instruments or other securities without their surrender.

         Section 2.7. TEMPORARY NOTES. Pending the preparation of definitive
Notes, the Company may execute and the Trustee or an authenticating agent
appointed by the Trustee shall, upon written request of the Company,
authenticate and deliver temporary Notes (printed or lithographed). Temporary
Notes shall be issuable in any authorized denomination, and substantially in the
form of the definitive Notes but with such omissions, insertions and variations
as may be appropriate for temporary Notes, all as may be determined by the
Company. Every such temporary Note shall be executed by the Company and
authenticated by the Trustee or such authenticating agent upon the same
conditions and in substantially the same manner, and with the same effect, as
the definitive Notes. Without unreasonable delay the Company will execute and
deliver to the Trustee or such authenticating agent definitive Notes (other than
in the case of Notes in global form) and thereupon any or all temporary Notes
(other than any the Global Note) may be surrendered in exchange therefor, at
each office or agency maintained by


                                       14
<PAGE>

the Company pursuant to Section 5.2 and the Trustee or such authenticating agent
shall authenticate and deliver in exchange for such temporary Notes an equal
aggregate principal amount of definitive Notes. Such exchange shall be made by
the Company at its own expense and without any charge therefor. Until so
exchanged, the temporary Notes shall in all respects be entitled to the same
benefits and subject to the same limitations under this Indenture as definitive
Notes authenticated and delivered hereunder.

         Section 2.8. CANCELLATION OF NOTES PAID, ETC. All Notes surrendered for
the purpose of payment, redemption, repurchase, conversion, exchange or
registration of transfer, shall, if surrendered to the Company or any paying
agent or any Note registrar or any conversion agent, be surrendered to the
Trustee and promptly canceled by it, or, if surrendered to the Trustee, shall be
promptly canceled by it, and no Notes shall be issued in lieu thereof except as
expressly permitted by any of the provisions of this Indenture. Upon written
instructions of the Company, the Trustee shall destroy canceled Notes and, after
such destruction, shall deliver a certificate of such destruction to the
Company. If the Company shall acquire any of the Notes, such acquisition shall
not operate as a redemption or satisfaction of the indebtedness represented by
such Notes unless and until the same are delivered to the Trustee for
cancellation.

                                  ARTICLE 3.

                              REDEMPTION OF NOTES

         Section 3.1. REDEMPTION PRICES.

         (a) OPTIONAL REDEMPTION. The Company may, at its option, redeem all or
from time to time any part of the Notes on any date prior to maturity, upon
notice as set forth in Section 3.2, and at the optional redemption prices set
forth in the form of Note attached as Exhibit A hereto, together with accrued
interest, if any, to, but excluding, the date fixed for redemption, PROVIDED,
HOWEVER, that, other than as provided in Section 3.1(b), no such redemption
shall be effected before March 20, 2003.

         (b) PROVISIONAL REDEMPTION. The Notes may be redeemed by the Company (a
"Provisional Redemption"), in whole or in part, at any time prior to March 20,
2003, upon notice as set forth in Section 3.2, at a redemption price equal to
$1,000 per $1,000 principal amount of Notes to be redeemed plus accrued and
unpaid interest, if any, to the date of redemption (the "Provisional Redemption
Date") if (i) the closing price of the Common Stock shall have exceeded 150% of
the Conversion Price then in effect for at least 20 Trading Days in any
consecutive 30-Trading Day period ending on the Trading Day prior to the date of
mailing of the notice of redemption pursuant to Section 3.2 (the "Notice Date").
Upon any such Provisional Redemption, the Company shall make an additional
payment in cash (the "Make-Whole Payment") with respect to the Notes called for
redemption to holders on the Notice Date in an amount equal to $152.54 per
$1,000 Note, less the aggregate amount of any interest actually paid on such
Note at any time prior to the Notice Date. The Company shall make the
Make-Whole Payment on all Notes called for Provisional Redemption, including
any Notes converted into


                                       15
<PAGE>

Common Stock pursuant to the terms hereof after the Notice Date and prior to the
Provisional Redemption Date. For purposes of this Article, the term "Conversion
Price" shall have the meaning given such term in Section 15.4 hereof.

         Section 3.2. NOTICE OF REDEMPTION; SELECTION OF NOTES.

         (a) In case the Company shall desire to exercise the right to redeem
all or, as the case may be, any part of the Notes pursuant to Section 3.1, it
shall fix a date for redemption, and it, or at its request (which must be
received by the Trustee at least ten (10) Business Days prior to the date the
Trustee is requested to give notice as described below unless a shorter period
is agreed to by the Trustee), the Trustee in the name of and at the expense of
the Company, shall mail or cause to be mailed a notice of such redemption at
least twenty (20) and not more than sixty (60) days prior to the date fixed for
redemption to the holders of Notes so to be redeemed as a whole or in part at
their last addresses as the same appear on the Note register (PROVIDED that if
the Company shall give such notice, it shall also give such notice, and notice
of the Notes to be redeemed, to the Trustee). Such mailing shall be by first
class mail. The notice if mailed in the manner herein provided shall be
conclusively presumed to have been duly given, whether or not the holder
receives such notice. In any case, failure to give such notice by mail or any
defect in the notice to the holder of any Note designated for redemption as a
whole or in part shall not affect the validity of the proceedings for the
redemption of any other Note.

         (b) Each such notice of redemption shall identify the Notes
(including CUSIP number(s)) to be redeemed, shall specify the aggregate
principal amount of Notes to be redeemed, the date fixed for redemption, the
redemption price at which Notes are to be redeemed, the place or places of
payment, that payment will be made upon presentation and surrender of such
Notes, that interest accrued to, but excluding, the date fixed for redemption
will be paid as specified in said notice, and that on and after said date
interest thereon or on the portion thereof to be redeemed will cease to
accrue. Such notice shall also state the current Conversion Price and the
date on which the right to convert such Notes or portions thereof into Common
Stock will expire. If fewer than all the Notes are to be redeemed, the notice
of redemption shall identify the Notes to be redeemed. In case any Note is to
be redeemed in part only, the notice of redemption shall state the portion of
the principal amount thereof to be redeemed and shall state that on and after
the date fixed for redemption, upon surrender of such Note, a new Note or
Notes in principal amount equal to the unredeemed portion thereof will be
issued.

         (c) On or prior to the redemption date specified in the notice of
redemption given as provided in this Section, the Company will deposit with the
Trustee or with one or more paying agents (or, if the Company is acting as its
own paying agent, set aside, segregate and hold in trust as provided in Section
5.4) an amount of money sufficient to redeem on the redemption date all the
Notes (or portions thereof) so called for redemption (other than those
theretofore surrendered for conversion into Common Stock) at the appropriate
redemption price, together with accrued interest to, but excluding, the date
fixed for redemption; PROVIDED that if such payment is made on the redemption
date it must be received by the Trustee or paying agent, as the case may be, by
10:00 a.m. New York City time, on such date. If any Note called for redemption
is converted


                                       16
<PAGE>

pursuant hereto, any money deposited with the Trustee or any paying agent or so
segregated and held in trust for the redemption of such Note shall be paid to
the Company upon its request, or, if then held by the Company shall be
discharged from such trust.

         (d) If fewer than all the Notes are to be redeemed, the Company will
give the Trustee written notice in the form of an Officers' Certificate not
fewer than twenty-five (25) days (or such shorter period of time as may be
acceptable to the Trustee) prior to the redemption date as to the aggregate
principal amount of Notes to be redeemed. If fewer than all the Notes are to be
redeemed, the Trustee shall select the Notes or portions thereof to be redeemed
(in principal amounts of $1,000 or integral multiples thereof), by lot, or by a
method the Trustee considers fair and appropriate (as long as such method is not
prohibited by the rules of any United States national securities exchange or of
an established automated over-the-counter trading market in the United States on
which the Notes are then listed). If any Note selected for partial redemption is
converted in part after such selection, the converted portion of such Note shall
be deemed (so far as is possible) to be the portion to be selected for
redemption. The Notes (or portions thereof) so selected shall be deemed duly
selected for redemption for all purposes hereof, notwithstanding that any such
Note is converted as a whole or in part before the mailing of the notice of
redemption.

         (e) Upon any redemption of less than all Notes, the Company and the
Trustee may (but need not) treat as outstanding any Notes surrendered for
conversion during the period of fifteen (15) days next preceding the mailing of
a notice of redemption and may (but need not) treat as not outstanding any Note
authenticated and delivered during such period in exchange for the unconverted
portion of any Note converted in part during such period.

         Section 3.3.      PAYMENT OF NOTES CALLED FOR REDEMPTION.

         (a) If notice of redemption has been given as above provided, the Notes
or portion of Notes with respect to which such notice has been given shall,
unless converted into Common Stock pursuant to the terms hereof, become due and
payable on the date and at the place or places stated in such notice at the
applicable redemption price, together with interest accrued to, but excluding,
the date fixed for redemption, and on and after said date (unless the Company
shall default in the payment of such Notes at the redemption price, together
with interest accrued to, but excluding, said date) interest on the Notes or
portion of Notes so called for redemption shall cease to accrue and such Notes
shall cease after the close of business on the Business Day next preceding the
date fixed for redemption to be convertible into Common Stock and, except as
provided in Sections 8.5 and 13.4, to be entitled to any benefit or security
under this Indenture, and the holders thereof shall have no right in respect of
such Notes except the right to receive the redemption price thereof and unpaid
interest to, but excluding, the date fixed for redemption. On presentation and
surrender of such Notes at a place of payment in said notice specified, the said
Notes or the specified portions thereof to be redeemed shall be paid and
redeemed by the Company at the applicable redemption price, together with
interest accrued thereon to, but excluding, the date fixed for redemption;
PROVIDED that, if the applicable redemption date is an interest payment date,
the semi-annual payment of interest becoming due on such date shall be


                                       17
<PAGE>

payable to the holders of such Notes registered as such on the relevant record
date subject to the terms and provisions of Section 2.3 hereof.

         (b) Upon presentation of any Note redeemed in part only, the Company
shall execute and the Trustee shall authenticate and deliver to the holder
thereof, at the expense of the Company, a new Note or Notes, of authorized
denominations, in principal amount equal to the unredeemed portion of the Notes
so presented.

         (c) Notwithstanding the foregoing, the Trustee shall not redeem any
Notes or mail any notice of optional redemption during the continuance of a
default in payment of interest or premium on the Notes or of any Event of
Default of which, in the case of any Event of Default other than under Section
7.1(a), (b), (c) or (e), a Responsible Officer of the Trustee has knowledge. If
any Note called for redemption shall not be so paid upon surrender thereof for
redemption, the principal and premium, if any, shall, until paid or duly
provided for, bear interest from the date fixed for redemption at the rate borne
by the Note and such Note shall remain convertible into Common Stock until the
principal and premium, if any, shall have been paid or duly provided for.

         Section 3.4. CONVERSION ARRANGEMENT ON CALL FOR REDEMPTION. In
connection with any redemption of Notes, the Company may arrange for the
purchase and conversion of any Notes not converted prior to the expiration of
such conversion right by an agreement with one or more investment bankers or
other purchasers to purchase such Notes by paying to the Trustee in trust for
the Noteholders, on or before the date fixed for redemption, an amount not less
than the applicable redemption price, together with interest accrued to the date
fixed for redemption, of such Notes. Notwithstanding anything to the contrary
contained in this Article 3, the obligation of the Company to pay the redemption
price of such Notes, together with interest accrued to, but excluding, the date
fixed for redemption, shall be deemed to be satisfied and discharged to the
extent such amount is so paid by such purchasers. If such an agreement is
entered into, a copy of which, certified as true and correct by the Secretary or
Assistant Secretary of the Company will be filed with the Trustee prior to the
date fixed for redemption, any Notes not duly surrendered for conversion by the
holders thereof may, at the option of the Company, be deemed, to the fullest
extent permitted by law, acquired by such purchasers from such holders and
(notwithstanding anything to the contrary contained in Article 15) surrendered
by such purchasers for conversion, all as of immediately prior to the close of
business on the date fixed for redemption (and the right to convert any such
Notes shall be deemed to have been extended through such time), subject to
payment of the above amount as aforesaid. At the direction of the Company, the
Trustee shall hold and dispose of any such amount paid to it in the same manner
as it would monies deposited with it by the Company for the redemption of Notes.
Without the Trustee's prior written consent, no arrangement between the Company
and such purchasers for the purchase and conversion of any Notes shall increase
or otherwise affect any of the powers, duties, responsibilities or obligations
of the Trustee as set forth in this Indenture, and the Company agrees to
indemnify the Trustee from, and hold it harmless against, any loss, liability or
expense arising out of or in connection with any such arrangement for the
purchase and conversion of any Notes between the Company and such purchasers,
including the costs and


                                       18
<PAGE>

expenses incurred by the Trustee in the defense of any claim or liability
arising out of or in connection with the exercise or performance of any of its
powers, duties, responsibilities or obligations under this Indenture.

                                  ARTICLE 4.

                              SUBORDINATION OF NOTES

         Section 4.1. AGREEMENT OF SUBORDINATION. The Company covenants and
agrees, and each holder of Notes issued hereunder by his acceptance thereof
likewise covenants and agrees, that all Notes shall be issued subject to the
provisions of this Article 4; and each person holding any Note, whether upon
original issue or upon transfer, assignment or exchange thereof, accepts and
agrees to be bound by such provisions.

         The payment of the principal of, premium, if any, and interest on all
Notes (including, but not limited to, the redemption price or repurchase price
with respect to the Notes to be redeemed or repurchased, as provided in this
Indenture) issued hereunder shall, to the extent and in the manner hereinafter
set forth, be subordinated to the prior payment in full, in cash or in such
other form of payment as may be acceptable to the holders of Senior
Indebtedness, of all Senior Indebtedness, whether outstanding at the date of
this Indenture or thereafter incurred or created.

         No provision of this Article 4 shall prevent the occurrence of any
default or Event of Default hereunder.

         Section 4.2. PAYMENTS TO NOTEHOLDERS. No payment (including pursuant
to any redemption or repurchase of Notes) shall be made with respect to the
principal of, or premium, if any, or interest on the Notes, except payments and
distributions made by the Trustee as permitted by Section 4.6, if:

                  (a) a default in the payment of principal, premium, if any, or
         interest or other payment due on Designated Senior Indebtedness occurs
         and is continuing beyond any applicable period of grace; or

                  (b) any other default occurs and is continuing with respect to
         Designated Senior Indebtedness that then permits holders of the
         Designated Senior Indebtedness as to which such default related to
         accelerate its maturity and the Trustee and the Company receive a
         notice of such default (a "Payment Blockage Notice") from a
         representative of Designated Senior Indebtedness or a holder of
         Designated Senior Indebtedness or the Company.

         The Company may and shall resume payments on the Notes (1) in the case
of a payment default, on the date upon which such default is cured or waived or
ceases to exist, and (2) in the case of a nonpayment default with respect to
Designated Senior Indebtedness, on the earlier of


                                       19
<PAGE>

the date on which the nonpayment default is cured or waived or ceases to exist
or 179 days pass after the date on which the applicable Payment Blockage Notice
is received.

         No new period of payment blockage may be commenced pursuant to a
Payment Blockage Notice unless (A) at least 365 days shall have elapsed since
the first day of effectiveness of the immediately prior Payment Blockage Notice
and (B) all scheduled payments of principal, premium, if any, and interest on
the Notes that have come due have been paid in full in cash, or in such other
form of payment as may be acceptable to the holders of the Notes. No default
(whether or not such event of default is on the same issue of Designated Senior
Indebtedness) that existed or was continuing on the date of delivery of any
Payment Blockage Notice to the Trustee shall be, or be made, the basis for a
subsequent Payment Blockage Notice.

         In addition, in the event of any acceleration of the Notes because of
an Event of Default, no payment or distribution (including with respect to any
redemption or repurchase of the Notes) shall be made to the Trustee or any
holder of Notes with respect to the principal of, premium, if any, or interest
on the Notes, except payments and distributions made by the Trustee as permitted
by Section 4.6, until all Senior Indebtedness has been paid in full in cash or
other payment satisfactory to the holders of Senior Indebtedness or such
acceleration is rescinded in accordance with the terms of this Indenture. If
payment of the Notes is accelerated because of an Event of Default, the Company
shall promptly notify holders of Senior Indebtedness of the acceleration.

         Notwithstanding the foregoing, in the event that the Trustee or any
holder of Notes receives any payment or distribution of assets of the Company of
any kind in contravention of any term of this Indenture, whether in cash,
property or securities, including, without limitation, by way of setoff or
otherwise, before all Senior Indebtedness is paid in full, in cash or such other
form of payment as may be acceptable to the holders of Senior Indebtedness, then
such payment or distribution shall be held by the recipient or recipients in
trust for the benefit of, and shall immediately be paid over or delivered to,
the holders of Senior Indebtedness or their respective representative or
representatives, or to the trustee or trustees under any indenture pursuant to
which any instruments evidencing any Senior Indebtedness may have been issued,
as their respective interests may appear, as calculated by the Company, for
application to the payment of all Senior Indebtedness remaining unpaid to the
extent necessary to make payment in full, in cash or such other form of payment
as may be acceptable to the holders of Senior Indebtedness, of all Senior
Indebtedness remaining unpaid, after giving effect to any concurrent payment or
distribution, or provision therefor, to or for the holders of such Senior
Indebtedness.

         Nothing in this Section 4.2 shall apply to claims of, or payments to,
the Trustee pursuant to Section 8.6. This Section 4.2 shall be subject to the
further provisions of Section 4.6.

         Section 4.3. BANKRUPTCY AND DISSOLUTION, ETC. Upon any payment by the
Company, or distribution of assets of the Company of any kind or character,
whether in cash, property or securities, to creditors upon any dissolution,
winding-up, liquidation or reorganization of the Company, whether voluntary or
involuntary or in bankruptcy, insolvency, receivership or other proceedings, all
amounts due or to become due upon all Senior Indebtedness shall first be paid in


                                       20
<PAGE>

full, in cash or in such other form of payment as may be acceptable to the
holders of Senior Indebtedness, before any payment is made on account of the
principal or premium, if any, and interest on the Notes (except payments made
pursuant to Article 13 from monies deposited with the Trustee pursuant thereto
prior to the happening of such dissolution, winding-up, liquidation or
reorganization or bankruptcy, insolvency, receivership or other such
proceedings); and upon any such dissolution, winding-up, liquidation or
reorganization or bankruptcy, insolvency, receivership or other such
proceedings, any payment by the Company, or distribution of assets of the
Company of any kind or character, whether in cash, property or securities, to
which the holders of the Notes or the Trustee under this Indenture would be
entitled, except for the provision of this Article 4, shall (except as
aforesaid) be paid by the Company or by any receiver, trustee in bankruptcy,
liquidating trustee, agent or other person making such payment or distribution,
or by the holders of the Notes or by the Trustee under this Indenture if
received by them or it, directly to the holders of Senior Indebtedness (pro rata
to such holders on the basis of the respective amounts of Senior Indebtedness
held by such holders, or as otherwise required by law or a court order) or their
respective representative or representatives, or to the trustee or trustees
under any indenture pursuant to which any instruments evidencing any Senior
Indebtedness may have been issued, as their respective interests may appear, to
the extent necessary to pay all Senior Indebtedness in full in cash or in such
other form of payment as may be acceptable to the holders of Senior Indebtedness
after giving effect to any concurrent payment or distribution to or for the
holders of Senior Indebtedness, before any payment or distribution is made to
the holders of the Notes or to the Trustee under this Indenture.

         Notwithstanding the foregoing, in the event that the Trustee or any
holder of Notes receives any payment or distribution of assets of the Company of
any kind in contravention of any term of this Indenture, whether in cash,
property or securities, including, without limitation, by way of setoff or
otherwise, before all Senior Indebtedness is paid in full, in cash or such other
form of payment as may be acceptable to the holders of Senior Indebtedness, then
such payment or distribution shall be held by the recipient or recipients in
trust for the benefit of, and shall immediately be paid over or delivered to,
the holders of Senior Indebtedness or their respective representative or
representatives, or to the trustee or trustees under any indenture pursuant to
which any instruments evidencing any Senior Indebtedness may have been issued,
as their respective interests may appear, as calculated by the Company, for
application to the payment of all Senior Indebtedness remaining unpaid to the
extent necessary to make payment in full, in cash or such other form of payment
as may be acceptable to the holders of Senior Indebtedness, of all Senior
Indebtedness remaining unpaid, after giving effect to any concurrent payment or
distribution, or provision therefor, to or for the holders of such Senior
Indebtedness.

         For purposes of Section 4.2 hereof and this Section 4.3, the words
"cash, property or securities" shall not be deemed to include shares of stock of
the Company as reorganized or readjusted, or securities of the Company or any
other corporation provided for by a plan of reorganization or readjustment, the
payment of which is subordinated (at least to the extent provided in this
Article 4 with respect to the Notes) to the payment of all Senior Indebtedness
which may at the time be outstanding; PROVIDED that (i) the Senior Indebtedness
is assumed by the new corporation, if any, resulting from such reorganization or
adjustment, and (ii) the rights


                                       21
<PAGE>

of the holders of Senior Indebtedness (other than leases which are not assumed
by the Company or by the new corporation, as the case may be) are not, without
the consent of such holders, altered by such reorganization or readjustment. The
consolidation of the Company with, or the merger of the Company into, another
corporation or the liquidation or dissolution of the Company following the
conveyance or transfer of its property as an entirety, or substantially as an
entirety, to another corporation upon the terms and conditions provided for in
Article 12 shall not be deemed a dissolution, winding-up, liquidation or
reorganization for the purposes of this Section 4.3 if such other corporation
shall, as a part of such consolidation, merger, conveyance or transfer, comply
with the conditions stated in Article 12.

         Nothing in this Section 4.3 shall apply to claims of, or payments to,
the Trustee under or pursuant to Section 8.6. This Section 4.3 shall be subject
to the further provisions of Section 4.6.

         Section 4.4. SUBROGATION OF NOTES. Subject to the payment in full in
cash or in such other form of payment as may be acceptable to the holders of
Senior Indebtedness of all Senior Indebtedness, the rights of the holders of the
Notes shall be subrogated to the extent of the payments or distributions made to
the holders of such Senior Indebtedness pursuant to the provisions of this
Article 4 (equally and ratably with the holders of all indebtedness of the
Company which by its express terms is subordinated to other indebtedness of the
Company to substantially the same extent as the Notes are subordinated and is
entitled to like rights of subrogation) to the rights of the holders of Senior
Indebtedness to receive payments or distributions of cash, property or
securities of the Company applicable to the Senior Indebtedness until the
principal of, and premium, if any, and interest on the Notes shall be paid in
full; and, for the purposes of such subrogation, no payments or distributions to
the holders of the Senior Indebtedness of any cash, property or securities to
which the holders of the Notes or the Trustee would be entitled except for the
provisions of this Article 4, and no payment over pursuant to the provisions of
this Article 4, to or for the benefit of the holders of Senior Indebtedness by
holders of the Notes or the Trustee, shall, as between the Company, its
creditors other than holders of Senior Indebtedness, and the holders of the
Notes, be deemed to be a payment by the Company to or on account of the Senior
Indebtedness; and no payments or distributions of cash, property or securities
to or for the benefit of the holders of the Notes pursuant to the subrogation
provisions of this Article 4, which would otherwise have been paid to the
holders of Senior Indebtedness shall be deemed to be a payment by the Company to
or for the account of the Notes. It is understood that the provisions of this
Article 4 are and are intended solely for the purposes of defining the relative
rights of the holders of the Notes, on the one hand, and the holders of the
Senior Indebtedness, on the other hand.

         Nothing contained in this Article 4 or elsewhere in this Indenture or
in the Notes is intended to or shall impair, as among the Company, its creditors
other than the holders of Senior Indebtedness, and the holders of the Notes, the
obligation of the Company, which is absolute and unconditional, to pay to the
holders of the Notes the principal of, and premium, if any, and interest on the
Notes as and when the same shall become due and payable in accordance with their
terms, or is intended to or shall affect the relative rights of the holders of
the Notes and creditors of the Company other than the holders of the Senior
Indebtedness, nor shall anything


                                       22
<PAGE>

herein or therein prevent the Trustee or the holder of any Note from exercising
all remedies otherwise permitted by applicable law upon default under this
Indenture, subject to the rights, if any, under this Article 4 of the holders of
Senior Indebtedness in respect of cash, property or securities of the Company
received upon the exercise of any such remedy.

         Upon any payment or distribution of assets of the Company referred to
in this Article 4, the Trustee, subject to the provisions of Section 8.1, and
the holders of the Notes shall be entitled to rely upon any order or decree made
by any court of competent jurisdiction in which such bankruptcy, dissolution,
winding-up, liquidation or reorganization proceedings are pending, or a
certificate of the receiver, trustee in bankruptcy, liquidating trustee, agent
or other person making such payment or distribution, delivered to the Trustee or
to the holders of the Notes, for the purpose of ascertaining the persons
entitled to participate in such distribution, the holders of the Senior
Indebtedness and other indebtedness of the Company, the amount thereof or
payable thereon, the amount or amounts paid or distributed thereon and all other
facts pertinent thereto or to this Article 4.

         Section 4.5. AUTHORIZATION BY NOTEHOLDERS. Each holder of a Note by
his acceptance thereof authorizes and directs the Trustee on his behalf to take
such action as may be necessary or appropriate to effectuate the subordination
provided in this Article 4 and appoints the Trustee his attorney-in-fact for any
and all such purposes.

         Section 4.6. NOTICE TO TRUSTEE. The Company shall give written notice
to the Trustee of the issuance of any Designated Senior Indebtedness. In
addition, the Company shall give prompt written notice in the form of an
Officers' Certificate to a Responsible Officer of the Trustee and to any paying
agent of any fact known to the Company which would prohibit the making of any
payment of monies to or by the Trustee or any paying agent in respect of the
Notes pursuant to the provisions of this Article 4. Notwithstanding the
provisions of this Article 4 or any other provision of this Indenture, the
Trustee shall not be charged with knowledge of the existence of any Senior
Indebtedness or of any default or event of default with respect to any Senior
Indebtedness or of any other facts which would prohibit the making of any
payment of monies to or by the Trustee in respect of the Notes pursuant to the
provisions of this Article 4, unless and until a Responsible Officer of the
Trustee shall have received written notice thereof at the Corporate Trust Office
from the Company (in the form of an Officers' Certificate) or a holder or
holders of Senior Indebtedness or from any trustee thereof who shall have been
certified by the Company or otherwise established to the reasonable satisfaction
of the Trustee to be such holder or trustee; and before the receipt of any such
written notice, the Trustee, subject to the provisions of Section 8.1, shall be
entitled in all respects to assume that no such facts exist; PROVIDED that if on
a date at least two (2) Business Days prior to the date upon which by the terms
hereof any such monies may become payable for any purpose (including, without
limitation, the payment of the principal of, or premium, if any, or interest on
any Note), the Trustee shall not have received with respect to such monies the
notice provided for in this Section 4.6, then, anything herein contained to the
contrary notwithstanding, the Trustee shall have full power and authority to
receive such monies and to apply the same to the purpose for


                                       23
<PAGE>

which they were received, and shall not be affected by any notice to the
contrary which may be received by it on or after such prior date.

         Notwithstanding anything to the contrary hereinbefore set forth,
nothing shall prevent (a) any payment by the Company or the Trustee to the
Noteholders of amounts in connection with a redemption of Notes if (i) notice of
such redemption has been given to the Noteholders pursuant to Article 3 prior to
the receipt by the Trustee of written notice as aforesaid, and (ii) such notice
of redemption is given not earlier than sixty (60) days before the redemption
date, (b) any payment by the Company or the Trustee to the Noteholders of
amounts in connection with a repurchase of Notes if (i) notice of such
repurchase has been given pursuant to Article 16 prior to the receipt by the
Trustee of written notice as aforesaid, and (ii) such notice of repurchase is
given not earlier than forty (40) days before the repurchase date, or (c) any
payment by the Trustee to the Noteholders of monies deposited with it pursuant
to Section 13.1.

         The Trustee, subject to the provisions of Section 8.1, shall be
entitled to rely on the delivery to it of a written notice by a person
representing himself to be a holder of Senior Indebtedness (or a trustee on
behalf of such holder) to establish that such notice has been given by a holder
of Senior Indebtedness or a trustee on behalf of any such holder or holders. In
the event that the Trustee determines in good faith that further evidence is
required with respect to the right of any person as a holder of Senior
Indebtedness to participate in any payment or distribution pursuant to this
Article 4, the Trustee may request such person to furnish evidence to the
reasonable satisfaction of the Trustee as to the amount of Senior Indebtedness
held by such person, the extent to which such person is entitled to participate
in such payment or distribution and any other facts pertinent to the rights of
such person under this Article 4, and if such evidence is not furnished the
Trustee may defer any payment to such person pending judicial determination as
to the right of such person to receive such payment.

         Section 4.7. TRUSTEE'S RELATION TO SENIOR INDEBTEDNESS. The Trustee
and any agent of the Company or the Trustee in its individual capacity shall be
entitled to all the rights set forth in this Article 4 in respect of any Senior
Indebtedness at any time held by it, to the same extent as any other holder of
Senior Indebtedness, and nothing in Section 8.13 or elsewhere in this Indenture
shall deprive the Trustee or any such agent of any of its rights as such holder.
Nothing in this Article 4 shall apply to claims of, or payments to, the Trustee
under or pursuant to Section 8.6.

         With respect to the holders of Senior Indebtedness, the Trustee
undertakes to perform or to observe only such of its covenants and obligations
as are specifically set forth in this Article 4, and no implied covenants or
obligations with respect to the holders of Senior Indebtedness shall be read
into this Indenture against the Trustee. The Trustee shall not be deemed to owe
any fiduciary duty to the holders of Senior Indebtedness and, subject to the
provisions of Section 4.2 and Section 8.1, the Trustee shall not be liable to
any holder of Senior Indebtedness if it shall pay over or deliver to holders of
Notes, the Company or any other person money or assets to which any holder of
Senior Indebtedness shall be entitled by virtue of this Article 4 or otherwise.


                                       24
<PAGE>

         Section 4.8. NO IMPAIRMENT OF SUBORDINATION. No right of any present
or future holder of any Senior Indebtedness to enforce subordination as herein
provided shall at any time in any way be prejudiced or impaired by any act or
failure to act on the part of the Company or by any act or failure to act, in
good faith, by any such holder, or by any noncompliance by the Company with the
terms, provisions and covenants of this Indenture, regardless of any knowledge
thereof which any such holder may have or otherwise be charged with.

         Section 4.9. CERTAIN CONVERSIONS DEEMED PAYMENT. For the purposes of
this Article 4 only, (1) the issuance and delivery of junior securities upon
conversion of Notes in accordance with Article 15 shall not be deemed to
constitute a payment or distribution on account of the principal of (or premium,
if any) or interest on Notes or on account of the purchase or other acquisition
of Notes, and (2) the payment, issuance or delivery of cash, property or
securities (other than junior securities) upon conversion of a Note shall be
deemed to constitute payment on account of the principal of such Note. For the
purposes of this Section, the term "junior securities" means (a) shares of any
stock of any class of the Company and (b) securities of the Company which are
subordinated in right of payment to all Senior Indebtedness which may be
outstanding at the time of issuance or delivery of such securities to
substantially the same extent as, or to a greater extent than, the Notes are so
subordinated as provided in this Article. Nothing contained in this Article or
elsewhere in this Indenture or in the Notes is intended to or shall impair, as
among the Company, its creditors other than holders of Senior Indebtedness and
the holders of the Notes, the right, which is absolute and unconditional, of the
holder of any Note to convert such Note in accordance with Article 15.

         Section 4.10. ARTICLE APPLICABLE TO PAYING AGENTS. If at any time any
paying agent other than the Trustee shall have been appointed by the Company and
be then acting hereunder, the term Trustee as used in this Article 4 shall
(unless the context shall otherwise require) be construed as extending to and
including such paying agent within its meaning as fully for all intents and
purposes as if such paying agent were named in this Article in addition to or in
place of the Trustee; provided, however, that the first sentence of Section 4.5
shall not apply to the Company or any Affiliate of the Company if it or such
Affiliate acts as paying agent.

                                 ARTICLE 5.

                      PARTICULAR COVENANTS OF THE COMPANY

         Section 5.1. PAYMENT OF PRINCIPAL, PREMIUM AND INTEREST. The Company
covenants and agrees that it will duly and punctually pay or cause to be paid
the principal of and premium, if any, and interest on each of the Notes at the
places, at the respective times and in the manner provided herein and in the
Notes. Each installment of interest on the Notes due on any semi-annual interest
payment date may be paid by mailing checks for the interest payable to or upon
the written order of the holders of Notes entitled thereto as they shall appear
on the registry books of the Company, provided that, with respect to any holder
of Notes with an aggregate principal amount equal to or in excess of $2,000,000,
at the request of such holder in writing to


                                       25
<PAGE>

the Company, interest on such holder's Notes shall be paid by wire transfer in
immediately available funds in accordance with the wire transfer instructions
supplied by such holder from time to time to the Trustee and paying agent (if
different from Trustee) at least two days prior to the applicable record date;
PROVIDED, FURTHER that any payment to the Depositary or its nominee shall be
made by wire transfer of immediately available funds to the account of the
Depositary or its +nominee.

         Section 5.2. MAINTENANCE OF OFFICE OR AGENCY. The Company will
maintain in the Borough of Manhattan, The City of New York, an office or agency
where the Notes may be surrendered for registration of transfer or exchange or
for presentation for payment or for conversion, redemption or repurchase and
where notices and demands to or upon the Company in respect of the Notes and
this Indenture may be served. The Company will give prompt written notice to the
Trustee of the location, and any change in the location, of such office or
agency not designated or appointed by the Trustee. If at any time the Company
shall fail to maintain any such required office or agency or shall fail to
furnish the Trustee with the address thereof, such presentations, surrenders,
notices and demands may be made or served at the Corporate Trust Office or the
office or agency of the Trustee in the Borough of Manhattan, The City of New
York.

         The Company may also from time to time designate one or more other
offices or agencies where the Notes may be presented or surrendered for any or
all such purposes and may from time to time rescind such designations; PROVIDED
that no such designation or rescission shall in any manner relieve the Company
of its obligation to maintain an office or agency in the Borough of Manhattan,
The City of New York, for such purposes. The Company will give prompt written
notice to the Trustee of any such designation or rescission and of any change in
the location of any such other office or agency.

         The Company hereby initially designates the Trustee as paying agent,
Note registrar, Custodian and conversion agent and the Corporate Trust Office
and the office or agency of the Trustee in the Borough of Manhattan, The City of
New York (which initially shall be the office of the Trustee located at [101
Barclay Street, 21W, New York, New York 10286]) as one such office or agency of
the Company for each of the aforesaid purposes.

         So long as the Trustee is the Note registrar, the Trustee agrees to
mail, or cause to be mailed, the notices set forth in Section 8.10(a) and the
third paragraph of Section 8.11.

         Section 5.3. APPOINTMENTS TO FILL VACANCIES IN TRUSTEE'S OFFICE. The
Company, whenever necessary to avoid or fill a vacancy in the office of Trustee,
will appoint, in the manner provided in Section 8.10, a Trustee, so that there
shall at all times be a Trustee hereunder.


                                       26
<PAGE>

         Section 5.4.      PROVISIONS AS TO PAYING AGENT.

         (a) If the Company shall appoint a paying agent other than the Trustee
or if the Trustee shall appoint such a paying agent, it will cause such paying
agent to execute and deliver to the Trustee an instrument in which such agent
shall agree with the Trustee, subject to the provisions of this Section 5.4:

                                    (1) that it will hold all sums held by it as
                  such agent for the payment of the principal of and premium, if
                  any, or interest on the Notes (whether such sums have been
                  paid to it by the Company or by any other obligor on the
                  Notes) in trust for the benefit of the holders of the Notes;

                                    (2) that it will give the Trustee notice of
                  any failure by the Company (or by any other obligor on the
                  Notes) to make any payment of the principal of and premium, if
                  any, or interest on the Notes when the same shall be due and
                  payable; and

                                    (3) that at any time during the continuance
                  of an Event of Default, upon request of the Trustee, it will
                  forthwith pay to the Trustee all sums so held in trust.

                  The Company shall, on or before each due date of the principal
         of, premium, if any, or interest on the Notes, deposit with the paying
         agent a sum sufficient to pay such principal, premium, if any, or
         interest, and (unless such paying agent is the Trustee) the Company
         will promptly notify the Trustee of any failure to take such action,
         provided that if such deposit is made on the due date, such deposit
         must be received by the paying agent by 10:00 a.m., New York City time,
         on such date.

         (b) If the Company shall act as its own paying agent, it will, on or
before each due date of the principal of, premium, if any, or interest on the
Notes, set aside, segregate and hold in trust for the benefit of the holders of
the Notes a sum sufficient to pay such principal, premium, if any, or interest
so becoming due and will notify the Trustee of any failure to take such action
and of any failure by the Company (or any other obligor under the Notes) to make
any payment of the principal of, premium, if any, or interest on the Notes when
the same shall become due and payable.

         (c) Anything in this Section 5.4 to the contrary notwithstanding, the
Company may, at any time, for the purpose of obtaining a satisfaction and
discharge of this Indenture, or for any other reason, pay or cause to be paid to
the Trustee all sums held in trust by the Company or any paying agent hereunder
as required by this Section 5.4, such sums to be held by the Trustee upon the
trusts herein contained and upon such payment by the Company or any paying agent
to the Trustee, the Company or such paying agent shall be released from all
further liability with respect to such sums.


                                       27
<PAGE>

         (d) Anything in this Section 5.4 to the contrary notwithstanding, the
agreement to hold sums in trust as provided in this Section 5.4 is subject to
Sections 13.3 and 13.4.

         Section 5.5. EXISTENCE. Subject to Article 12, the Company will do or
cause to be done all things necessary to preserve and keep in full force and
effect its corporate existence.

         Section 5.6. RESERVED.

         Section 5.7. STAY, EXTENSION AND USURY LAWS. The Company covenants (to
the extent that it may lawfully do so) that it shall not at any time insist
upon, plead, or in any manner whatsoever claim or take the benefit or advantage
of, any stay, extension or usury law or other law which would prohibit or
forgive the Company from paying all or any portion of the principal of or
interest on the Notes as contemplated herein, wherever enacted, now or at any
time hereafter in force, or which may affect the covenants or the performance of
this Indenture; and the Company (to the extent it may lawfully do so) hereby
expressly waives all benefit or advantage of any such law, and covenants that it
will not, by resort to any such law, hinder, delay or impede the execution of
any power herein granted to the Trustee, but will suffer and permit the
execution of every such power as though no such law has been enacted.

         Section 5.8. COMPLIANCE CERTIFICATE. The Company shall deliver to
the Trustee within 120 days after the end of each fiscal year of the Company
(beginning with the fiscal year ending on December 31, 2000) an Officers'
Certificate stating whether or not to the best of their knowledge the signers
know of any default or Event of Default that occurred during such period. If
they do, such Officers' Certificate shall describe the default or Event of
Default and its status.

         Section 5.9. FURTHER INSTRUMENTS AND ACTS. Upon request of the
Trustee, the Company will execute and deliver such further instruments and do
such further acts as may be reasonably necessary or proper to carry out more
effectively the purposes of this Indenture.

         Section 5.10. PAYMENT OF TAXES AND OTHER CLAIMS. The Company will pay
or discharge or cause to be paid or discharged, before the same shall become
delinquent, (1) all material taxes, assessments and governmental charges levied
or imposed upon it or any subsidiary or upon the income, profits or property of
the Company or any subsidiary, (2) all material lawful claims for labor,
materials and supplies which, if unpaid, might by law become a lien upon the
property of the Company or any subsidiary; and (3) all stamps and similar
duties, if any, which may be imposed by the United States, the United Kingdom or
any political subdivision thereof or therein in connection with the issuance,
transfer, exchange or conversion of any Notes or with respect to this Indenture;
provided, however, that, in the case of clauses (1) and (2) that the Company
shall not be required to pay or discharge or cause to be paid or discharged any
such tax, assessment, charge or claim whose amount, applicability or validity is
being contested in good faith by appropriate proceedings.


                                       28
<PAGE>

                                   ARTICLE 6.

         NOTEHOLDERS' LISTS AND REPORTS BY THE COMPANY AND THE TRUSTEE

         Section 6.1. NOTEHOLDERS' LISTS. The Company covenants and agrees that
it will furnish or cause to be furnished to the Trustee, semi-annually, not more
than fifteen (15) days after each March 30 and September 30 in each year
beginning with September 30, 2000, and at such other times as the Trustee may
request in writing, within thirty (30) days after receipt by the Company of any
such request (or such lesser time as the Trustee may reasonably request in order
to enable it to timely provide any notice to be provided by it hereunder), a
list in such form as the Trustee may reasonably require of the names and
addresses of the holders of Notes as of a date not more than fifteen (15) days
(or such other date as the Trustee may reasonably request in order to so provide
any such notices) prior to the time such information is furnished, except that
no such list need be furnished so long as the Trustee is acting as Note
registrar.

         Section 6.2. PRESERVATION AND DISCLOSURE OF LISTS.

                  (a) The Trustee shall preserve, in as current a form as is
reasonably practicable, all information as to the names and addresses of the
holders of Notes contained in the most recent list furnished to it as provided
in Section 6.1 or maintained by the Trustee in its capacity as Note registrar,
if so acting. The Trustee may destroy any list furnished to it as provided in
Section 6.1 upon receipt of a new list so furnished.

                  (b) The rights of Noteholders to communicate with other
holders of Notes with respect to their rights under this Indenture or under the
Notes and the corresponding rights and duties of the Trustee, shall be as
provided by the Trust Indenture Act.

                  (c) Every Noteholder, by receiving and holding the same,
agrees with the Company and the Trustee that neither the Company nor the Trustee
nor any agent of either of them shall be held accountable by reason of any
disclosure of information as to names and addresses of holders of Notes made
pursuant to the Trust Indenture Act.

         Section 6.3. REPORTS BY TRUSTEE.

                  (a) The Trustee shall transmit to holders of Notes such
reports concerning the Trustee and its actions under this Indenture as may be
required pursuant to the Trust Indenture Act at the times and in the manner
provided pursuant thereto.

                  (b) A copy of such report shall, at the time of such
transmission to holders of Notes, be filed by the Trustee with each stock
exchange and automated quotation system upon which the Notes are listed, if any,
and with the Company and the Commission. The Company will notify the Trustee
when the Notes are listed on any stock exchange or automated quotation system
and when any such listing is discontinued.


                                       29
<PAGE>

         Section 6.4. REPORTS BY COMPANY.

                  (a) The Company shall file with the Trustee and the
Commission, and transmit to holders of Notes, such information, documents and
other reports and such summaries thereof, as may be required pursuant to the
Trust Indenture Act at the times and in the manner provided pursuant to such
Act; PROVIDED that any such information, documents or reports required to be
filed with the Commission pursuant to Section 13 or 15(d) of the Exchange Act
shall be filed with the Trustee within 15 days after the same is so required to
be filed with the Commission.

                  (b) The Company will deliver to the Trustee (i) as soon as
available and in any event within ninety (90) days after the end of each fiscal
year of the Company (x) a consolidated balance sheet of the Company and its
subsidiaries as of the end of such fiscal year and the related consolidated
statements of operations, stockholders' equity and cash flows for such fiscal
year, all reported on by an independent public accountant of nationally
recognized standing and (y) a report containing a management's discussion and
analysis of the financial condition and results of operations and a description
of the business and properties of the Company and (ii) as soon as available and
in any event within forty-five (45) days after the end of each of the first
three quarters of each fiscal year of the Company an unaudited consolidated
management's discussion and analysis of the financial condition and results of
operations of the Company for such quarter; provided that the foregoing
statements and reports shall not be required for any fiscal year or quarter, as
the case may be, with respect to which the Company files or expects to file with
the Trustee an annual report or quarterly report, as the case may be, pursuant
to the preceding paragraph of this Section 6.4. The Trustee shall have no
liability as regards the substance of the information provided by the Company or
its agents pursuant to this Section 6.4.

                                   ARTICLE 7.

                             DEFAULTS AND REMEDIES

         Section 7.1. EVENTS OF DEFAULT. In case one or more of the following
Events of Default (whatever the reason for such Event of Default and whether it
shall be voluntary or involuntary or be effected by operation of law or pursuant
to any judgment, decree or order of any court or any order, rule or regulation
of any administrative or governmental body) shall have occurred and be
continuing:

         (a) default in the payment of the principal of and premium, if any, on
any of the Notes as and when the same shall become due and payable either at
maturity or in connection with any redemption, by declaration or otherwise,
whether or not such payment is prohibited by the provisions of Article 4; or


                                       30
<PAGE>

         (b) default for thirty (30) days in the payment of any installment of
interest upon any of the Notes as and when the same shall become due and
payable, whether or not such payment is prohibited by the provisions of Article
4; or

         (c) failure on the part of the Company, within 5 days of the
satisfaction of the requirements for conversion set forth in Section 15.2 with
respect to any Note, to deliver shares of its common stock, including cash for
fractional shares, to the holder of such Note; or

         (d) failure on the part of the Company duly to observe or perform any
other of the covenants on the part of the Company in the Notes or in this
Indenture (other than a covenant a default in whose performance or whose breach
is elsewhere in this Section specifically dealt with) and the continuance of
such failure for a period of forty-five (45) days after the date on which
written notice of such failure, requiring the Company to remedy the same, shall
have been given to the Company by the Trustee, or to the Company and a
Responsible Officer of the Trustee by the holders of at least 25% in aggregate
principal amount of the outstanding Notes at the time outstanding determined in
accordance with Section 9.4; or

         (e) a default in the payment of the Repurchase Price in respect of any
Note on the repurchase date therefor in accordance with the provisions of
Article 16, whether or not such payment in cash of the Repurchase Price is
prohibited by the provisions of Article 4; or

         (f) failure on the part of the Company to provide a written notice of a
Repurchase Event in accordance with Section 16.2; or

         (g) failure on the part of the Company or any Significant Subsidiary to
make any payment at maturity, including any applicable grace period, in respect
of Indebtedness of, or guaranteed or assumed by, the Company or any Significant
Subsidiary, in a principal amount then outstanding in excess of U.S. $5,000,000,
and the continuance of such failure for a period of thirty (30) days after there
shall have been given, by registered or certified mail, to the Company by the
Trustee or to the Company and the Trustee by the holders of not less than 25% in
aggregate principal amount of the Notes then outstanding, a written notice
specifying such default and requiring the Company to cause such default to be
cured or waived and stating that such notice is a "Notice of Default" hereunder;
or

         (h) default on the part of the Company or any Significant Subsidiary
with respect to any Indebtedness of, or guaranteed or assumed by, the Company or
any Significant Subsidiary, which default results in the acceleration of
Indebtedness in a principal amount then outstanding in excess of U.S.
$5,000,000, and such Indebtedness shall not have been discharged or such
acceleration shall not have been rescinded or annulled for a period of thirty
(30) days after there shall have been given, by registered or certified mail, to
the Company by the Trustee or to the Company and the Trustee by the holders of
not less than 25% in aggregate principal amount of the Notes then outstanding, a
written notice specifying such default and requiring the Company to cause such
Indebtedness to be discharged or cause such default to be cured or waived or
such


                                       31
<PAGE>

acceleration to be rescinded or annulled and stating that such notice is a
"Notice of Default" hereunder; or

         (i) the Company or any Significant Subsidiary shall commence a
voluntary case or other proceeding seeking liquidation, reorganization or other
relief with respect to itself or its debts under any bankruptcy, insolvency or
other similar law now or hereafter in effect or seeking the appointment of a
trustee, receiver, liquidator, custodian or other similar official of it or any
substantial part of its property, or shall consent to any such relief or to the
appointment of or taking possession by any such official in an involuntary case
or other proceeding commenced against it, or shall make a general assignment for
the benefit of creditors, or shall fail generally to pay its debts as they
become due; or

         (j) an involuntary case or other proceeding shall be commenced against
the Company or any Significant Subsidiary seeking liquidation, reorganization or
other relief with respect to it or its debts under any bankruptcy, insolvency or
other similar law now or hereafter in effect or seeking the appointment of a
trustee, receiver, liquidator, custodian or other similar official of it or any
substantial part of its property, and such involuntary case or other proceeding
shall remain undismissed and unstayed for a period of ninety (90) consecutive
days;

then, and in each and every such case (other than an Event of Default specified
in Section 7.1(i) or (j) with respect to the Company), unless the principal of
all of the Notes shall have already become due and payable, either the Trustee
or the holders of not less than 25% in aggregate principal amount of the Notes
then outstanding hereunder determined in accordance with Section 9.4, by notice
in writing to the Company (and to the Trustee if given by Noteholders), may
declare the principal of and premium, if any, on all the Notes and the interest
accrued thereon to be due and payable immediately, and upon any such declaration
the same shall become and shall be immediately due and payable, anything in this
Indenture or in the Notes contained to the contrary notwithstanding. If an Event
of Default specified in Section 7.1(i) or (j) occurs and is continuing with
respect to the Company, the principal of all the Notes and the interest accrued
thereon shall be immediately due and payable. This provision, however, is
subject to the conditions that if, at any time after the principal of the Notes
shall have been so declared due and payable, and before any judgment or decree
for the payment of the monies due shall have been obtained or entered as
hereinafter provided, the Company shall pay or shall deposit with the Trustee a
sum sufficient to pay all matured installments of interest upon all Notes and
the principal of and premium, if any, on any and all Notes which shall have
become due otherwise than by acceleration (with interest on overdue installments
of interest (to the extent that payment of such interest is enforceable under
applicable law) and on such principal and premium, if any, at the rate borne by
the Notes, to the date of such payment or deposit) and amounts due to the
Trustee pursuant to Section 8.6, and if any and all defaults under this
Indenture, other than the nonpayment of principal of and premium, if any, and
accrued interest on Notes which shall have become due by acceleration, shall
have been cured or waived pursuant to Section 7.7, then and in every such case
the holders of a majority in aggregate principal amount of the Notes then
outstanding, by written notice to the Company and to the Trustee, may waive all
defaults or Events of Default and rescind and annul such declaration and its


                                       32
<PAGE>

consequences; but no such waiver or rescission and annulment shall extend to or
shall affect any subsequent default or Event of Default, or shall impair any
right consequent thereon. The Company shall notify the Responsible Officer of
the Trustee, promptly upon becoming aware thereof, of any default or Event of
Default and shall deliver to the Trustee a statement specifying such default or
Event of Default and the action the Company has taken, is taking or proposes to
take with respect thereto.

         In case the Trustee shall have proceeded to enforce any right under
this Indenture and such proceedings shall have been discontinued or abandoned
because of such waiver or rescission and annulment or for any other reason or
shall have been determined adversely to the Trustee, then and in every such case
the Company, the holders of Notes, and the Trustee shall be restored
respectively to their several positions and rights hereunder, and all rights,
remedies and powers of the Company, the holders of Notes, and the Trustee shall
continue as though no such proceeding had been instituted.

         Section 7.2. PAYMENTS OF NOTES ON DEFAULT; SUIT THEREFOR. The Company
covenants that (a) in case default shall be made in the payment by the Company
of any installment of interest upon any of the Notes as and when the same shall
become due and payable, and such default shall have continued for a period of
thirty (30) days, or (b) in case default shall be made in the payment of the
principal of or premium, if any, on any of the Notes as and when the same shall
have become due and payable, whether at maturity of the Notes or in connection
with any redemption or repurchase, by declaration under this Indenture or
otherwise, then, upon demand of the Trustee, the Company will pay to the
Trustee, for the benefit of the holders of the Notes, the whole amount that then
shall have become due and payable on all such Notes for principal and premium,
if any, or interest, or both, as the case may be, with interest upon the overdue
principal and premium, if any, and (to the extent that payment of such interest
is enforceable under applicable law) upon the overdue installments of interest
at the rate borne by the Notes; and, in addition thereto, such further amount as
shall be sufficient to cover the costs and expenses of collection, including
reasonable compensation to the Trustee, its agents, attorneys and counsel, and
any expenses or liabilities incurred by the Trustee hereunder other than through
its negligence or bad faith. Until such demand by the Trustee, the Company may
pay the principal of and premium, if any, and interest on the Notes to the
registered holders, whether or not the Notes are overdue.

         In case the Company shall fail forthwith to pay such amounts upon such
demand, the Trustee, in its own name and as trustee of an express trust, shall
be entitled and empowered to institute any actions or proceedings at law or in
equity for the collection of the sums so due and unpaid, and may prosecute any
such action or proceeding to judgment or final decree, and may enforce any such
judgment or final decree against the Company or any other obligor on the Notes
and collect in the manner provided by law out of the property of the Company or
any other obligor on the Notes wherever situated the monies adjudged or decreed
to be payable.

         In the case there shall be pending proceedings for the bankruptcy or
for the reorganization of the Company or any other obligor on the Notes under
Title 11 of the United


                                       33
<PAGE>

States Code, or any other applicable law, or in case a receiver, assignee or
trustee in bankruptcy or reorganization, liquidator, sequestrator or similar
official shall have been appointed for or taken possession of the Company or
such other obligor, the property of the Company or such other obligor, or in the
case of any other judicial proceedings relative to the Company or such other
obligor upon the Notes, or to the creditors or property of the Company or such
other obligor, the Trustee, irrespective of whether the principal of the Notes
shall then be due and payable as therein expressed or by declaration or
otherwise and irrespective of whether the Trustee shall have made any demand
pursuant to the provisions of this Section 7.2, shall be entitled and empowered,
by intervention in such proceedings or otherwise, to file and prove a claim or
claims for the whole amount of principal, premium, if any, and interest owing
and unpaid in respect of the Notes, and, in case of any judicial proceedings, to
file such proofs of claim and other papers or documents and to take such other
actions as it may deem necessary or advisable in order to have the claims of the
Trustee and of the Noteholders allowed in such judicial proceedings relative to
the Company or any other obligor on the Notes, its or their creditors, or its or
their property, and to collect and receive any monies or other property payable
or deliverable on any such claims, and to distribute the same after the
deduction of any amounts due the Trustee under Section 8.6; and any receiver,
assignee or trustee in bankruptcy or reorganization, liquidator, custodian or
similar official is hereby authorized by each of the Noteholders to make such
payments to the Trustee, and, in the event that the Trustee shall consent to the
making of such payments directly to the Noteholders, to pay to the Trustee any
amount due it for reasonable compensation, expenses, advances and disbursements,
including agents and counsel fees incurred by it up to the date of such
distribution. To the extent that such payment of reasonable compensation,
expenses, advances and disbursements out of the estate in any such proceedings
shall be denied for any reason, payment of the same shall be secured by a lien
on, and shall be paid out of, any and all distributions, dividends, monies,
securities and other property which the holders of the Notes may be entitled to
receive in such proceedings, whether in liquidation or under any plan of
reorganization or arrangement or otherwise.

         All rights of action and of asserting claims under this Indenture, or
under any of the Notes, may be enforced by the Trustee without the possession of
any of the Notes, or the production thereof on any trial or other proceeding
relative thereto, and any such suit or proceeding instituted by the Trustee
shall be brought in its own name as trustee of an express trust, and any
recovery of judgment shall, after provision for the payment of the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel, be for the ratable benefit of the holders of the Notes.

         In any proceedings brought by the Trustee (and in any proceedings
involving the interpretation of any provision of this Indenture to which the
Trustee shall be a party) the Trustee shall be held to represent all the holders
of the Notes, and it shall not be necessary to make any holders of the Notes
parties to any such proceedings.

         Section 7.3. APPLICATION OF MONIES COLLECTED BY TRUSTEE. Any monies
collected by the Trustee pursuant to this Article 7 shall be applied in the
order following, at the date or dates fixed by the Trustee for the distribution
of such monies, upon presentation of the several Notes,


                                       34
<PAGE>

and stamping thereon the payment, if only partially paid, and upon surrender
thereof, if fully paid:

                  First:  To the payment of all amounts due the Trustee under
         Section 8.6;

                  Second: Subject to the provisions of Article 4, in case the
         principal of the outstanding Notes shall not have become due and be
         unpaid, to the payment of interest on the Notes in default in the order
         of the maturity of the installments of such interest, with interest (to
         the extent that such interest has been collected by the Trustee) upon
         the overdue installments of interest at the rate borne by the Notes,
         such payments to be made ratably to the persons entitled thereto;

                  Third: Subject to the provisions of Article 4, in case the
         principal of the outstanding Notes shall have become due, by
         declaration or otherwise, and be unpaid, to the payment of the whole
         amount then owing and unpaid upon the Notes for principal and premium,
         if any, and interest, with interest on the overdue principal and
         premium, if any, and (to the extent that such interest has been
         collected by the Trustee) upon overdue installments of interest at the
         rate borne by the Notes; and in case such monies shall be insufficient
         to pay in full the whole amounts so due and unpaid upon the Notes, then
         to the payment of such principal and premium, if any, and interest
         without preference or priority of principal and premium, if any, over
         interest, or of interest over principal and premium, if any, or of any
         installment of interest over any other installment of interest, or of
         any Note over any other Note, ratably to the aggregate of such
         principal and premium, if any, and accrued and unpaid interest; and

                  Fourth:  Subject to the provisions of Article 4, to the
         payment of the remainder, if any, to the Company or any other person
         lawfully entitled thereto.

         Section 7.4. PROCEEDINGS BY NOTEHOLDER. No holder of any Note shall
have any right by virtue of or by availing of any provision of this Indenture to
institute any suit, action or proceeding in equity or at law upon or under or
with respect to this Indenture, or for the appointment of a receiver, trustee,
liquidator, custodian or other similar official, or for any other remedy
hereunder, unless such holder previously shall have given to the Trustee written
notice of an Event of Default and of the continuance thereof, as hereinbefore
provided, and unless also the holders of not less than 25% in aggregate
principal amount of the Notes then outstanding shall have made written request
upon the Trustee to institute such action, suit or proceeding in its own name as
Trustee hereunder and shall have offered to the Trustee such indemnity as may be
reasonably satisfactory to the Trustee against the costs, expenses and
liabilities to be incurred therein or thereby, and the Trustee for sixty (60)
days after its receipt of such notice, request and offer of indemnity, shall
have neglected or refused to institute any such action, suit or proceeding and
no direction inconsistent with such written request shall have been given to the
Trustee pursuant to Section 7.7; it being understood and intended, and being
expressly covenanted by the taker and holder of every Note with every other
taker and holder and the Trustee, that no one or more holders of Notes shall
have any right in any manner whatever by virtue of or by availing of


                                       35
<PAGE>

any provision of this Indenture to affect, disturb or prejudice the rights of
any other holder of Notes, or to obtain or seek to obtain priority over or
preference to any other such holder, or to enforce any right under this
Indenture, except in the manner herein provided and for the equal, ratable and
common benefit of all holders of Notes (except as otherwise provided herein).
For the protection and enforcement of this Section 7.4, each and every
Noteholder and the Trustee shall be entitled to such relief as can be given
either at law or in equity.

         Notwithstanding any other provision of this Indenture and any provision
of any Note, the right of any holder of any Note to receive payment of the
principal of and premium, if any, and interest on such Note, on or after the
respective due dates expressed in such Note, or to institute suit for the
enforcement of any such payment on or after such respective dates against the
Company shall not be impaired or affected without the consent of such holder.

         Anything in this Indenture or the Notes to the contrary
notwithstanding, the holder of any Note, without the consent of either the
Trustee or the holder of any other Note, in his own behalf and for his own
benefit, may enforce, and may institute and maintain any proceeding suitable to
enforce, his rights of conversion as provided herein.

         Section 7.5. PROCEEDINGS BY TRUSTEE. In case of an Event of Default
the Trustee may in its discretion proceed to protect and enforce the rights
vested in it by this Indenture by such appropriate judicial proceedings as the
Trustee shall deem most effectual to protect and enforce any of such rights,
either by suit in equity or by action at law or by proceeding in bankruptcy or
otherwise, whether for the specific enforcement of any covenant or agreement
contained in this Indenture or in aid of the exercise of any power granted in
this Indenture, or to enforce any other legal or equitable right vested in the
Trustee by this Indenture or by law.

         Section 7.6. REMEDIES CUMULATIVE AND CONTINUING. Except as provided in
the last paragraph of Section 2.6, all powers and remedies given by this Article
7 to the Trustee or to the Noteholders shall, to the extent permitted by law, be
deemed cumulative and not exclusive of any thereof or of any other powers and
remedies available to the Trustee or the holders of the Notes, by judicial
proceedings or otherwise, to enforce the performance or observance of the
covenants and agreements contained in this Indenture, and no delay or omission
of the Trustee or of any holder of any of the Notes to exercise any right or
power accruing upon any default or Event of Default occurring and continuing as
aforesaid shall impair any such right or power, or shall be construed to be a
waiver of any such default or any acquiescence therein; and, subject to the
provisions of Section 7.4, every power and remedy given by this Article 7 or by
law to the Trustee or to the Noteholders may be exercised from time to time, and
as often as shall be deemed expedient, by the Trustee or by the Noteholders.

         Section 7.7. DIRECTION OF PROCEEDINGS AND WAIVER OF DEFAULTS BY
MAJORITY OF NOTEHOLDERS. The holders of a majority in aggregate principal amount
of the Notes at the time outstanding determined in accordance with Section 9.4
shall have the right to direct the time, method, and place of conducting any
proceeding for any remedy available to the Trustee or exercising any trust or
power conferred on the Trustee; PROVIDED, HOWEVER, that (a) such direction


                                       36
<PAGE>

shall not be in conflict with any rule of law or with this Indenture, and (b)
the Trustee may take any other action deemed proper by the Trustee which is not
inconsistent with such direction. The holders of a majority in aggregate
principal amount of the Notes at the time outstanding determined in accordance
with Section 9.4 may on behalf of the holders of all of the Notes waive any past
default or Event of Default hereunder and its consequences except (i) a default
in the payment of interest or premium, if any, on, or the principal of, the
Notes when due, (ii) a failure by the Company to convert any Notes into Common
Stock or (iii) a default in respect of a covenant or provisions hereof which
under Article 11 cannot be modified or amended without the consent of the
holders of all Notes then outstanding. Upon any such waiver the Company, the
Trustee and the holders of the Notes shall be restored to their former positions
and rights hereunder; but no such waiver shall extend to any subsequent or other
default or Event of Default or impair any right consequent thereon. Whenever any
default or Event of Default hereunder shall have been waived as permitted by
this Section 7.7, said default or Event of Default shall for all purposes of the
Notes and this Indenture be deemed to have been cured and to be not continuing;
but no such waiver shall extend to any subsequent or other default or Event of
Default or impair any right consequent thereon.

         Section 7.8. NOTICE OF DEFAULTS. The Trustee shall, within ninety (90)
days after the occurrence of a default, mail to all Noteholders, as the names
and addresses of such holders appear upon the Note register, notice of all
defaults known to a Responsible Officer, unless such defaults shall have been
cured or waived before the giving of such notice; and provided that, except in
the case of default in the payment of the principal of, or premium, if any, or
interest on any of the Notes, including without limiting the generality of the
foregoing any default in the payment of any Repurchase Price or in the payment
of any amount due in connection with any redemption of Notes, then in any such
event the Trustee shall be protected in withholding such notice if and so long
as a trust committee of directors and/or Responsible Officers of the Trustee in
good faith determine that the withholding of such notice is in the interests of
the Noteholders.

         Section 7.9. UNDERTAKING TO PAY COSTS. All parties to this Indenture
agree, and each holder of any Note by his acceptance thereof shall be deemed to
have agreed, that any court may, in its discretion, require, in any suit for the
enforcement of any right or remedy under this Indenture, or in any suit against
the Trustee for any action taken or omitted by it as Trustee, the filing by any
party litigant in such suit of an undertaking to pay the costs of such suit and
that such court may in its discretion assess reasonable costs, including
reasonable attorneys' fees, against any party litigant in such suit, having due
regard to the merits and good faith of the claims or defenses made by such party
litigant; PROVIDED that the provisions of this Section 7.9 shall not apply to
any suit instituted by the Trustee, to any suit instituted by any Noteholder, or
group of Noteholders, holding in the aggregate more than 10% in principal amount
of the Notes at the time outstanding determined in accordance with Section 9.4,
or to any suit instituted by any Noteholder for the enforcement of the payment
of the principal of or premium, if any, or interest on any Note (including, but
not limited to, the redemption price or repurchase price with respect to the
Notes being redeemed or repurchased as provided in this Indenture) on or after
the due date expressed in such Note or to any suit for the enforcement of the
right to convert any Note in accordance with the provisions of Article 15.


                                       37
<PAGE>

         Section 7.10. DELAY OR OMISSION NOT WAIVER. No delay or omission of
the Trustee or of any holder of any Note to exercise any right or remedy
accruing upon any Event of Default shall impair any such right or remedy or
constitute a waiver of any such Event of Default or any acquiescence therein.
Every right and remedy given by this Article or by law to the Trustee or to the
holders of Notes may be exercised from time to time, and as often as may be
deemed expedient, by the Trustee or by the holders of Notes, as the case may be.

                                   ARTICLE 8.

                             CONCERNING THE TRUSTEE

         Section 8.1. DUTIES AND RESPONSIBILITIES OF TRUSTEE. The Trustee, prior
to the occurrence of an Event of Default and after the curing or waiver of all
Events of Default which may have occurred, undertakes to perform such duties and
only such duties as are specifically set forth in this Indenture. In case an
Event of Default has occurred (which has not been cured or waived) the Trustee
shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in their exercise, as a prudent person
would exercise or use under the circumstances in the conduct of such person's
own affairs.

         No provision of this Indenture shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure
to act or its own willful misconduct, except that:

                  (a) prior to the occurrence of an Event of Default and after
         the curing or waiving of all Events of Default which may have occurred:

                           (1) the duties and obligations of the Trustee shall
                  be determined solely by the express provisions of this
                  Indenture and, after it has been qualified thereunder, the
                  Trust Indenture Act, and the Trustee shall not be liable
                  except for the performance of such duties and obligations as
                  are specifically set forth in this Indenture and no implied
                  covenants or obligations shall be read into this Indenture and
                  the Trust Indenture Act against the Trustee; and

                           (2) in the absence of bad faith and willful
                  misconduct on the part of the Trustee, the Trustee may
                  conclusively rely, as to the truth of the statements and the
                  correctness of the opinions expressed therein, upon any
                  certificates or opinions furnished to the Trustee and
                  conforming to the requirements of this Indenture; but, in the
                  case of any such certificates or opinions which by any
                  provisions hereof are specifically required to be furnished to
                  the Trustee, the Trustee shall be under a duty to examine the
                  same to determine whether or not they conform to the
                  requirements of this Indenture;


                                       38
<PAGE>

                  (b) the Trustee shall not be liable for any error of judgment
         made in good faith by a Responsible Officer or Officers of the Trustee,
         unless it shall be provided that the Trustee was negligent in
         ascertaining the pertinent facts;

                  (c) the Trustee shall not be liable to any Noteholder with
         respect to any action taken or omitted to be taken by it in good faith
         in accordance with the direction of the holders of not less than a
         majority in principal amount of the Notes at the time outstanding
         determined as provided in Section 9.4 relating to the time, method and
         place of conducting any proceeding for any remedy available to the
         Trustee, or exercising any trust or power conferred upon the Trustee,
         under this Indenture; and

                  (d) whether or not therein provided, every provision of this
         Indenture relating to the conduct or affecting the liability of, or
         affording protection to, the Trustee shall be subject to the provisions
         of this Section.

                  None of the provisions contained in this Indenture shall
require the Trustee to expend or risk its own funds or otherwise incur personal
financial liability in the performance of any of its duties or in the exercise
of any of its rights or powers, if there is reasonable ground for believing that
the repayment of such funds or adequate indemnity against such risk or liability
is not reasonably assured to it.

         Section 8.2. RELIANCE ON DOCUMENTS, OPINIONS, ETC. Except as otherwise
provided in Section 8.1:

         (a) the Trustee may rely and shall be protected in acting upon any
resolution, certificate, statement, instrument, opinion, report, notice,
request, consent, order, bond, note, coupon or other paper or document believed
by it in good faith to be genuine and to have been signed or presented by the
proper party or parties;

         (b) any request, direction, order or demand of the Company mentioned
herein shall be sufficiently evidenced by an Officers' Certificate (unless other
evidence in respect thereof be herein specifically prescribed); and any
resolution of the Board of Directors may be evidenced to the Trustee by a copy
thereof certified by the Secretary or an Assistant Secretary of the Company;

         (c) the Trustee may consult with counsel and any advice of such counsel
or Opinion of Counsel shall be full and complete authorization and protection in
respect of any action taken or omitted by it hereunder in good faith and in
accordance with such advice or Opinion of Counsel;

         (d) the Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request, order or
direction of any of the Noteholders pursuant to the provisions of this
Indenture, unless such Noteholders shall have offered to the Trustee


                                       39
<PAGE>

reasonable security or indemnity against the costs, expenses and liabilities
which may be incurred therein or thereby;

         (e) the Trustee shall not be bound to make any investigation into the
facts or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture or
other paper or document, but the Trustee, in its discretion, may make such
further inquiry or investigation into such facts or matters as it may see fit,
and, if the Trustee shall determine to make such further inquiry or
investigation, it shall be entitled to examine the books, records and premises
of the Company, personally or by agent or attorney; PROVIDED, HOWEVER, that if
the payment within a reasonable time to the Trustee of the costs, expenses or
liabilities likely to be incurred by it in the making of such investigation is,
in the opinion of the Trustee, not reasonably assured to the Trustee by the
security afforded to it by the terms of this Indenture, the Trustee may require
indemnity reasonably satisfactory to the Trustee from the Noteholders against
such expenses or liability as a condition to so proceeding; the reasonable
expenses of every such examination shall be paid by the Company or, if paid by
the Trustee or any predecessor Trustee, shall be repaid by the Company upon
demand; and

         (f) the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed by it with due care
hereunder.

In no event shall the Trustee be liable for any consequential loss or damage of
any kind whatsoever (including but not limited to lost profits), even if the
Trustee has been advised of the likelihood of such loss or damage and regardless
of the form of action other than through the Trustee's willful misconduct or
gross negligence.

         Section 8.3. NO RESPONSIBILITY FOR RECITALS, ETC. The recitals
contained herein and in the Notes (except in the Trustee's certificate of
authentication) shall be taken as the statements of the Company, and the Trustee
assumes no responsibility for the correctness of the same. The Trustee makes no
representations as to the validity or sufficiency of this Indenture or of the
Notes. The Trustee shall not be accountable for the use or application by the
Company of any Notes or the proceeds of any Notes authenticated and delivered by
the Trustee in conformity with the provisions of this Indenture.

         Section 8.4. TRUSTEE, PAYING AGENTS, CONVERSION AGENTS OR REGISTRAR MAY
OWN NOTES. The Trustee, any paying agent, any conversion agent or Note
registrar, in its individual or any other capacity, may become the owner or
pledgee of Notes with the same rights it would have if it were not Trustee,
paying agent, conversion agent or Note registrar.

         Section 8.5. MONIES TO BE HELD IN TRUST. Subject to the provisions of
Section 13.4, all monies received by the Trustee shall, until used or applied as
herein provided, be held in trust for the purposes for which they were received.
Money held by the Trustee in trust hereunder need not be segregated from other
funds except to the extent required by law. The Trustee shall be


                                       40
<PAGE>

under no liability for interest on any money received by it hereunder except as
may be agreed from time to time by the Company and the Trustee.

         Section 8.6. COMPENSATION AND EXPENSES OF TRUSTEE. The Company
covenants and agrees to pay to the Trustee from time to time, and the Trustee
shall be entitled to, reasonable compensation for all services rendered by it
hereunder in any capacity (which shall not be limited by any provision of law in
regard to the compensation of a trustee of an express trust), and the Company
will pay or reimburse the Trustee upon its request for all reasonable expenses,
disbursements and advances reasonably incurred or made by the Trustee in
accordance with any of the provisions of this Indenture (including the
reasonable compensation and the expenses and disbursements of its agents and
counsel and of all persons not regularly in its employ) except any such expense,
disbursement or advance as may arise from its negligence, willful misconduct or
bad faith. The Company also covenants to indemnify the Trustee in any capacity
under this Indenture and its agents and any authenticating agent for, and to
hold them harmless against, any loss, liability or expense incurred without
negligence, willful misconduct or bad faith on the part of the Trustee or such
agent or authenticating agent, as the case may be, and arising out of or in
connection with the acceptance or administration of this trust or in any other
capacity hereunder, including the costs and expenses of defending themselves
against any claim of liability in the premises. The obligations of the Company
under this Section 8.6 to compensate or indemnify the Trustee and to pay or
reimburse the Trustee for expenses, disbursements and advances shall be secured
by a lien prior to that of the Notes upon all property and funds held or
collected by the Trustee as such, except, subject to the effect of Sections 4.3
and 7.6, funds held in trust herewith for the benefit of the holders of
particular Notes prior to the date of the accrual of such unpaid compensation or
indemnifiable claim. The obligation of the Company under this Section shall
survive the satisfaction and discharge of this Indenture. The indemnification
provided in this Section 8.6 shall extend to the officers, directors, agents and
employees of the Trustee.

         When the Trustee and its agents and any authenticating agent incur
expenses or render services after an Event of Default specified in Section
7.1(i) or (j) occurs, the expenses and the compensation for the services are
intended to constitute expenses of administration under any bankruptcy,
insolvency or similar laws.

         Section 8.7. OFFICERS' CERTIFICATE AS EVIDENCE. Except as otherwise
provided in Section 8.1, whenever in the administration of the provisions of
this Indenture the Trustee shall deem it necessary or desirable that a matter be
proved or established prior to taking or omitting any action hereunder, such
matter (unless other evidence in respect thereof be herein specifically
prescribed) may, in the absence of negligence, willful misconduct, recklessness
and bad faith on the part of the Trustee, be deemed to be conclusively proved
and established by an Officers' Certificate delivered to the Trustee, and such
Officers' Certificate, in the absence of negligence, willful misconduct,
recklessness and bad faith on the part of the Trustee, shall be full warrant to
the Trustee for any action taken or omitted by it under the provisions of this
Indenture upon the faith thereof.


                                       41
<PAGE>

         Section 8.8. CONFLICTING INTERESTS OF TRUSTEE. If the Trustee has or
shall acquire a conflicting interest within the meaning of the Trust Indenture
Act, the Trustee shall either eliminate such interest or resign, to the extent
and in the manner provided by, and subject to the provisions of, the Trust
Indenture Act and this Indenture.

         Section 8.9. ELIGIBILITY OF TRUSTEE. There shall at all times be a
Trustee hereunder which shall be a person that is eligible pursuant to the Trust
Indenture Act to act as such and has a combined capital and surplus (together
with its corporate parent) of at least $50,000,000. If such person publishes
reports of condition at least annually, pursuant to law or to the requirements
of any supervising or examining authority, then for the purposes of this
Section, the combined capital and surplus of such person shall be deemed to be
its combined capital and surplus as set forth in its most recent report of
condition so published. If at any time the Trustee shall cease to be eligible in
accordance with the provisions of this Section, it shall resign immediately in
the manner and with the effect hereinafter specified in this Article.

         Section 8.10. RESIGNATION OR REMOVAL OF TRUSTEE.

         (a) The Trustee may at any time resign by giving written notice of such
resignation to the Company and by mailing notice thereof to the holders of Notes
at their addresses as they shall appear on the Note register. Upon receiving
such notice of resignation, the Company shall promptly appoint a successor
trustee by written instrument, in duplicate, executed by order of the Board of
Directors, one copy of which instrument shall be delivered to the resigning
Trustee and one copy to the successor trustee. If no successor trustee shall
have been so appointed and have accepted appointment sixty (60) days after the
mailing of such notice of resignation to the Noteholders, the resigning Trustee
may petition any court of competent jurisdiction for the appointment of a
successor trustee, or any Noteholder who has been a bona fide holder of a Note
or Notes for at least six months may, subject to the provisions of Section 7.9,
on behalf of himself and all others similarly situated, petition any such court
for the appointment of a successor trustee. Such court may thereupon, after such
notice, if any, as it may deem proper and prescribe, appoint a successor
trustee.

         (b) In case at any time any of the following shall occur:

                                    (1) the Trustee shall fail to comply with
                  Section 8.8 within a reasonable time after written request
                  therefor by the Company or by any Noteholder who has been a
                  bona fide holder of a Note or Notes for at least six months,
                  or

                                    (2) the Trustee shall cease to be eligible
                  in accordance with the provisions of Section 8.9 and shall
                  fail to resign after written request therefor by the Company
                  or by any such Noteholder, or

                                    (3) the Trustee shall become incapable of
                  acting, or shall be adjudged a bankrupt or insolvent, or a
                  receiver of the Trustee or of its property shall be appointed,
                  or any public officer shall take charge or control of the
                  Trustee


                                       42
<PAGE>

                  or of its property or affairs for the purpose of
                  rehabilitation, conservation or liquidation,

         then, in any such case, the Company may by a Board resolution remove
         the Trustee and appoint a successor trustee by written instrument, in
         duplicate, executed by order of the Board of Directors, one copy of
         which instrument shall be delivered to the Trustee so removed and one
         copy to the successor trustee, or, subject to the provisions of Section
         7.9, any Noteholder who has been a bona fide holder of a Note or Notes
         for at least six months may, on behalf of himself and all others
         similarly situated, petition any court of competent jurisdiction for
         the removal of the Trustee and the appointment of a successor trustee.
         Such court may thereupon, after such notice, if any, as it may deem
         proper and prescribe, remove the Trustee and appoint a successor
         trustee.

         (c) The holders of a majority in aggregate principal amount of the
Notes at the time outstanding may at any time remove the Trustee and nominate a
successor trustee which shall be deemed appointed as successor trustee unless
within ten (10) days after notice to the Company of such nomination the Company
objects thereto, in which case the Trustee so removed or any Noteholder, upon
the terms and conditions and otherwise as in Section 8.10(a) provided, may
petition any court of competent jurisdiction for an appointment of a successor
trustee.

         (d) Any resignation or removal of the Trustee and appointment of a
successor trustee pursuant to any of the provisions of this Section 8.10 shall
become effective upon acceptance of appointment by the successor trustee as
provided in Section 8.11.

         Section 8.11. ACCEPTANCE BY SUCCESSOR TRUSTEE. Any successor trustee
appointed as provided in Section 8.10 shall execute, acknowledge and deliver to
the Company and to its predecessor trustee an instrument accepting such
appointment hereunder, and thereupon the resignation or removal of the
predecessor trustee shall become effective and such successor trustee, without
any further act, deed or conveyance, shall become vested with all the rights,
powers, duties and obligations of its predecessor hereunder, with like effect as
if originally named as trustee herein; but, nevertheless, on the written request
of the Company or of the successor trustee, the trustee ceasing to act shall,
upon payment of any amounts then due it pursuant to the provisions of Section
8.6, execute and deliver an instrument transferring to such successor trustee
all the rights and powers of the trustee so ceasing to act. Upon request of any
such successor trustee, the Company shall execute any and all instruments in
writing for more fully and certainly vesting in and confirming to such successor
trustee all such rights and powers. Any trustee ceasing to act shall,
nevertheless, retain a lien upon all property and funds held or collected by
such trustee as such, except for funds held in trust for the benefit of holders
of particular Notes, to secure any amounts then due it pursuant to the
provisions of Section 8.6.

         No successor trustee shall accept appointment as provided in this
Section 8.11 unless at the time of such acceptance such successor trustee shall
be qualified under the provisions of Section 8.8 and be eligible under the
provisions of Section 8.9.


                                       43
<PAGE>

         Upon acceptance of appointment by a successor trustee as provided in
this Section 8.11, each of the Company and the former trustee shall mail or
cause to be mailed notice of the succession of such trustee hereunder to the
holders of Notes at their addresses as they shall appear on the Note register.
If the Company fails to mail such notice within ten (10) days after acceptance
of appointment by the successor trustee, the successor trustee shall cause such
notice to be mailed at the expense of the Company.

         Section 8.12. SUCCESSION BY MERGER, ETC. Any corporation or other
entity into which the Trustee may be merged or converted or with which it may be
consolidated, or any corporation resulting from any merger, conversion or
consolidation to which the Trustee shall be a party, or any corporation or other
entity succeeding to all or substantially all of the corporate trust business of
the Trustee, shall be the successor to the Trustee hereunder without the
execution or filing of any paper or any further act on the part of any of the
parties hereto, provided that in the case of any corporation succeeding to all
or substantially all of the corporate trust business of the Trustee such
corporation shall be qualified under the provisions of Section 8.8 and eligible
under the provisions of Section 8.9.

         In case at the time such successor to the Trustee shall succeed to the
trusts created by this Indenture, any of the Notes shall have been authenticated
but not delivered, any such successor to the Trustee may adopt the certificate
of authentication of any predecessor trustee or authenticating agent appointed
by such predecessor trustee, and deliver such Notes so authenticated; and in
case at that time any of the Notes shall not have been authenticated, any
successor to the Trustee or an authenticating agent appointed by such successor
trustee may authenticate such Notes either in the name of any predecessor
trustee hereunder or in the name of the successor trustee; and in all such cases
such certificates shall have the full force which it is anywhere in the Notes or
in this Indenture provided that the certificate of the Trustee shall have;
PROVIDED, HOWEVER, that the right to adopt the certificate of authentication of
any predecessor Trustee or to authenticate Notes in the name of any predecessor
Trustee shall apply only to its successor or successors by merger, conversion or
consolidation.

         Section 8.13. LIMITATION ON RIGHTS OF TRUSTEE AS CREDITOR. If and when
the Trustee shall be or become a creditor of the Company (or any other obligor
upon the Notes), the Trustee shall be subject to the provisions of the Trust
Indenture Act regarding the collection of the claims against the Company (or any
such other obligor).


                                       44
<PAGE>

                                   ARTICLE 9.

                           CONCERNING THE NOTEHOLDERS

         Section 9.1. ACTION BY NOTEHOLDERS. Whenever in this Indenture it is
provided that the holders of a specified percentage in aggregate principal
amount of the Notes may take any action (including the making of any demand or
request, the giving of any notice, consent or waiver or the taking of any other
action), the fact that at the time of taking any such action, the holders of
such specified percentage have joined therein may be evidenced (a) by any
instrument or any number of instruments of similar tenor executed by Noteholders
in person or by agent or proxy appointed in writing, or (b) by the record of the
holders of Notes voting in favor thereof at any meeting of Noteholders duly
called and held in accordance with the provisions of Article X, or (c) by a
combination of such instrument or instruments and any such record of such a
meeting of Noteholders. Whenever the Company or the Trustee solicits the taking
of any action by the holders of the Notes, the Company or the Trustee may fix in
advance of such solicitation, a date as the record date for determining holders
entitled to take such action. The record date shall be not more than fifteen
(15) days prior to the date of commencement of solicitation of such action.

         Section 9.2. PROOF OF EXECUTION BY NOTEHOLDERS. Subject to the
provisions of Sections 8.1, 8.2 and 10.5, proof of the execution of any
instrument by a Noteholder or his agent or proxy shall be sufficient if made in
accordance with such reasonable rules and regulations as may be prescribed by
the Trustee or in such manner as shall be satisfactory to the Trustee. The
holding of Notes shall be proved by the Note register or by a certificate of the
Note registrar. The record of any Noteholders' meeting shall be proved in the
manner provided in Section 10.6.

         Section 9.3. WHO ARE DEEMED ABSOLUTE OWNERS. The Company, the Trustee,
any authenticating agent, any paying agent, any conversion agent and any Note
registrar may deem the person in whose name such Note shall be registered upon
the Note register to be, and may treat him as, the absolute owner of such Note
(whether or not such Note shall be overdue and notwithstanding any notation of
ownership or other writing thereon) for the purpose of receiving payment of or
on account of the principal of, premium, if any, and interest on such Note, for
conversion of such Note and for all other purposes; and neither the Company nor
the Trustee nor any paying agent nor any conversion agent nor any Note registrar
shall be affected by any notice to the contrary. All such payments so made to
any holder for the time being, or upon his order, shall be valid, and, to the
extent of the sum or sums so paid, effectual to satisfy and discharge the
liability for monies payable upon any such Note.

         Section 9.4. COMPANY-OWNED NOTES DISREGARDED. In determining whether
the holders of the requisite aggregate principal amount of Notes have concurred
in any direction, consent, waiver or other action under this Indenture, Notes
which are owned by the Company or any other obligor on the Notes or by any
person directly or indirectly controlling or controlled by or under direct or
indirect common control with the Company or any other obligor on the Notes shall
be disregarded and deemed not to be outstanding for the purpose of any such
determination;


                                       45
<PAGE>

PROVIDED that for the purposes of determining whether the Trustee shall be
protected in relying on any such direction, consent, waiver or other action only
Notes which a Responsible Officer knows are so owned shall be so disregarded.
Notes so owned which have been pledged in good faith may be regarded as
outstanding for the purposes of this Section 9.4 if the pledgee shall establish
to the satisfaction of the Trustee the pledgee's right to vote such Notes and
that the pledgee is not the Company, any other obligor on the Notes or a person
directly or indirectly controlling or controlled by or under direct or indirect
common control with the Company or any such other obligor. In the case of a
dispute as to such right, any decision by the Trustee taken upon the advice of
counsel shall be full protection to the Trustee. Upon request of the Trustee,
the Company shall furnish to the Trustee promptly an Officers' Certificate
listing and identifying all Notes, if any, known by the Company to be owned or
held by or for the account of any of the above described persons; and, subject
to Section 8.1, the Trustee shall be entitled to accept such Officers'
Certificate as conclusive evidence of the facts therein set forth and of the
fact that all Notes not listed therein are outstanding for the purpose of any
such determination.

         Section 9.5. REVOCATION OF CONSENTS; FUTURE HOLDERS BOUND. At any time
prior to (but not after) the evidencing to the Trustee, as provided in Section
9.1, of the taking of any action by the holders of the percentage in aggregate
principal amount of the Notes specified in this Indenture in connection with
such action, any holder of a Note which is shown by the evidence to be included
in the Notes the holders of which have consented to such action may, by filing
written notice with the Trustee at its Corporate Trust Office and upon proof of
holding as provided in Section 9.2, revoke such action so far as concerns such
Note. Except as aforesaid, any such action taken by the holder of any Note shall
be conclusive and binding upon such holder and upon all future holders and
owners of such Note and of any Notes issued in exchange or substitution
therefor, irrespective of whether any notation in regard thereto is made upon
such Note or any Note issued in exchange or substitution therefor.

                                   ARTICLE 10.

                              NOTEHOLDERS' MEETINGS

         Section 10.1. PURPOSE OF MEETINGS. A meeting of Noteholders may be
called at any time and from time to time pursuant to the provisions of this
Article 10 for any of the following purposes:

                  (a) to give any notice to the Company or to the Trustee or to
         give any directions to the Trustee permitted under this Indenture, or
         to consent to the waiving of any default or Event of Default hereunder
         and its consequences, or to take any other action authorized to be
         taken by Noteholders pursuant to any of the provisions of Article 7;

                  (b) to remove the Trustee and nominate a successor trustee
         pursuant to the provisions of Article 8;


                                       46
<PAGE>

                  (c) to consent to the execution of an indenture or indentures
         supplemental hereto pursuant to the provisions of Section 11.2;

                  (d) to take any other action authorized to be taken by or on
         behalf of the holders of any specified aggregate principal amount of
         the Notes under any other provision of this Indenture or under
         applicable law; or

                  (e) to take any other action authorized by this Indenture or
         under applicable law.

         Section 10.2. CALL OF MEETINGS BY TRUSTEE. The Trustee may at any time
call a meeting of Noteholders to take any action specified in Section 10.1, to
be held at such time and at such place in the Borough of Manhattan, The City of
New York, as the Trustee shall determine. Notice of every meeting of the
Noteholders, setting forth the time and the place of such meeting and in general
terms the action proposed to be taken at such meeting and the establishment of
any record date pursuant to Section 9.1, shall be mailed to holders of Notes at
their addresses as they shall appear on the Note register. Such notice shall
also be mailed to the Company. Such notices shall be mailed not less than twenty
(20) nor more than ninety (90) days prior to the date fixed for the meeting.

         Any meeting of Noteholders shall be valid without notice if the holders
of all Notes then outstanding are present in person or by proxy or if notice is
waived before or after the meeting by the holders of all Notes outstanding, and
if the Company and the Trustee are either present by duly authorized
representatives or have, before or after the meeting, waived notice.

         Section 10.3. QUORUM. The persons entitled to vote a majority in
principal amount of the outstanding Notes shall constitute a quorum. In the
absence of a quorum within 30 minutes of the time appointed for any such
meeting, the meeting shall, if convened at the request of Noteholders of Notes,
be dissolved. In any other case, the meeting may be adjourned for a period of
not less than 10 days as determined by the chairman of the meeting prior to the
adjournment of such meeting. In the absence of a quorum at any such adjourned
meeting, such adjourned meeting may be further adjourned for a period not less
than 10 days as determined by the chairman of the meeting prior to the
adjournment of such adjourned meeting (subject to repeated applications of this
sentence). Notice of the reconvening of any adjourned meeting shall be given as
provided in Section 10.2 except that such notice need be given only once not
less than five days prior to the date on which the meeting is scheduled to be
reconvened. Notice of the reconvening of an adjourned meeting shall state
expressly the percentage of the principal amount of the outstanding Notes which
shall constitute a quorum.

                  Subject to the foregoing, at the reconvening of any meeting
adjourned for a lack of a quorum, the Persons entitled to vote 25% in principal
amount of the outstanding Notes at the time shall constitute a quorum for the
taking of any action set forth in the notice of the original meeting.


                                       47
<PAGE>

                  At a meeting or an adjourned meeting duly reconvened and at
which a quorum is present as aforesaid, any resolution and all matters (except
as limited by the proviso to Section 11.2 and except to the extent Section 7.7
requires a different vote) shall be effectively passed and decided if passed or
decided by the lesser of (i) the holders of not less than a majority in
principal amount of outstanding Notes and (ii) the persons entitled to vote not
less than 66-2/3% in principal amount of outstanding Notes represented and
entitled to vote at such meeting.

                  Any resolution passed or decisions taken at any meeting of
holders of Notes duly held in accordance with this Section shall be binding on
all the holders of Notes whether or not present or represented at the meeting.
The Trustee shall, in the name and at the expense of the Company, notify all the
holders of Notes of any such resolutions or decisions.

         Section 10.4. CALL OF MEETINGS BY COMPANY OR NOTEHOLDERS. In case at
any time the Company, pursuant to a resolution of its Board of Directors, or the
holders of at least 10% in aggregate principal amount of the Notes then
outstanding, shall have requested the Trustee to call a meeting of Noteholders,
by written request setting forth in reasonable detail the action proposed to be
taken at the meeting, and the Trustee shall not have mailed the notice of such
meeting within twenty (20) days after receipt of such request, then the Company
or such Noteholders may determine the time and the place for such meeting and
may call such meeting to take any action authorized in Section 10.1, by mailing
notice thereof as provided in Section 10.2.

         Section 10.5. QUALIFICATIONS FOR VOTING. To be entitled to vote at any
meeting of Noteholders a person shall (a) be a holder of one or more Notes on
the record date pertaining to such meeting or (b) be a person appointed by an
instrument in writing as proxy by a holder of one or more Notes. The only
persons who shall be entitled to be present or to speak at any meeting of
Noteholders shall be the persons entitled to vote at such meeting and their
counsel and any representatives of the Trustee and its counsel and any
representatives of the Company and its counsel.

         Section 10.6. REGULATIONS. Notwithstanding any other provisions of
this Indenture, the Trustee may make such reasonable regulations as it may deem
advisable for any meeting of Noteholders, in regard to proof of the holding of
Notes and of the appointment of proxies, and in regard to the appointment and
duties of inspectors of votes, the submission and examination of proxies,
certificates and other evidence of the right to vote, and such other matters
concerning the conduct of the meeting as it shall think fit.

         The Trustee shall, by an instrument in writing, appoint a temporary
chairman of the meeting, unless the meeting shall have been called by the
Company or by Noteholders as provided in Section 10.3, in which case the Company
or the Noteholders calling the meeting, as the case may be, shall in like manner
appoint a temporary chairman. A permanent chairman and a permanent secretary of
the meeting shall be elected by vote of the holders of a majority in principal
amount of the Notes represented at the meeting and entitled to vote at the
meeting.


                                       48
<PAGE>

         Subject to the provisions of Section 9.4, at any meeting each
Noteholder or proxyholder shall be entitled to one vote for each $1,000
principal amount of Notes held or represented by him; PROVIDED, HOWEVER, that no
vote shall be cast or counted at any meeting in respect of any Note challenged
as not outstanding and ruled by the chairman of the meeting to be not
outstanding. The chairman of the meeting shall have no right to vote other than
by virtue of Notes held by him or instruments in writing as aforesaid duly
designating him as the proxy to vote on behalf of other Noteholders. Any meeting
of Noteholders duly called pursuant to the provisions of Section 10.2 or 10.3
may be adjourned from time to time by the holders of a majority of the aggregate
principal amount of Notes represented at the meeting, whether or not
constituting a quorum, and the meeting may be held as so adjourned without
further notice.

         Section 10.7. VOTING. The vote upon any resolution submitted to any
meeting of Noteholders shall be by written ballot on which shall be subscribed
the signatures of the holders of Notes or of their representatives by proxy and
the principal amount of the Notes held or represented by them. The permanent
chairman of the meeting shall appoint two inspectors of votes who shall count
all votes cast at the meeting for or against any resolution and who shall make
and file with the secretary of the meeting their verified written reports in
duplicate of all votes cast at the meeting. A record in duplicate of the
proceedings of each meeting of Noteholders shall be prepared by the secretary of
the meeting and there shall be attached to said record the original reports of
the inspectors of votes on any vote by ballot taken thereat and affidavits by
one or more persons having knowledge of the facts setting forth a copy of the
notice of the meeting and showing that said notice was mailed as provided in
Section 10.2. The record shall show the principal amount of the Notes voting in
favor of or against any resolution. The record shall be signed and verified by
the affidavits of the permanent chairman and secretary of the meeting and one of
the duplicates shall be delivered to the Company and the other to the Trustee to
be preserved by the Trustee, the latter to have attached thereto the ballots
voted at the meeting.

         Any record so signed and verified shall be conclusive evidence of the
matters therein stated.

         Section 10.8. NO DELAY OF RIGHTS BY MEETING. Nothing in this Article
10 contained shall be deemed or construed to authorize or permit, by reason of
any call of a meeting of Noteholders or any rights expressly or impliedly
conferred hereunder to make such call, any hindrance or delay in the exercise of
any right or rights conferred upon or reserved to the Trustee or to the
Noteholders under any of the provisions of this Indenture or of the Notes.


                                       49
<PAGE>

                                   ARTICLE 11.

                             SUPPLEMENTAL INDENTURES

         Section 11.1. SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF NOTEHOLDERS.
The Company, when authorized by the resolutions of the Board of Directors, and
the Trustee may from time to time and at any time enter into an indenture or
indentures supplemental hereto for one or more of the following purposes:

         (a)      to make provision with respect to the conversion rights of the
holders of Notes pursuant to the requirements of Section 15.6;

         (b) subject to Article 4, to convey, transfer, assign, mortgage or
pledge to the Trustee as security for the Notes, any property or assets;

         (c) to evidence the succession of another corporation to the Company,
or successive successions, and the assumption by the successor corporation of
the covenants, agreements and obligations of the Company pursuant to Article 12;

         (d) to add to the covenants of the Company such further covenants,
restrictions or conditions for the benefit of the holders of Notes, and to make
the occurrence, or the occurrence and continuance, of a default in any such
additional covenants, restrictions or conditions a default or an Event of
Default permitting the enforcement of all or any of the several remedies
provided in this Indenture as herein set forth; PROVIDED, HOWEVER, that in
respect of any such additional covenant, restriction or condition such
supplemental indenture may provide for a particular period of grace after
default (which period may be shorter or longer than that allowed in the case of
other defaults) or may provide for an immediate enforcement upon such default or
may limit the remedies available to the Trustee upon such default;

         (e) to provide for the issuance under this Indenture of Notes in coupon
form (including Notes registrable as to principal only) and to provide for
exchangeability of such Notes with the Notes issued hereunder in fully
registered form and to make all appropriate changes for such purpose;

         (f) to cure any ambiguity or to correct or supplement any provision
contained herein or in any supplemental indenture which may be defective or
inconsistent with any other provision contained herein or in any supplemental
indenture, or to make such other provisions in regard to matters or questions
arising under this Indenture which shall not materially adversely affect the
interests of the holders of the Notes;

         (g) to evidence and provide for the acceptance of appointment hereunder
by a successor Trustee with respect to the Notes; or


                                       50
<PAGE>

         (h) to modify, eliminate or add to the provisions of this Indenture to
such extent as shall be necessary to effect the qualifications of this Indenture
under the Trust Indenture Act, or under any similar federal statute hereafter
enacted.

          The Trustee is hereby authorized to join with the Company in the
execution of any such supplemental indenture, to make any further appropriate
agreements and stipulations which may be therein contained and to accept the
conveyance, transfer and assignment of any property thereunder, but the Trustee
shall not be obligated to, but may in its discretion, enter into any
supplemental indenture which affects the Trustee's own rights, duties or
immunities under this Indenture or otherwise.

         Any supplemental indenture authorized by the provisions of this Section
11.1 may be executed by the Company and the Trustee without the consent of the
holders of any of the Notes at the time outstanding, notwithstanding any of the
provisions of Section 11.2.

         Section 11.2. SUPPLEMENTAL INDENTURES WITH CONSENT OF NOTEHOLDERS.
With the consent (evidenced as provided in Article 9) of the holders of not less
than a majority in aggregate principal amount of the Notes at the time
outstanding (determined in accordance with Section 9.4), the Company, when
authorized by the resolutions of the Board of Directors, and the Trustee may
from time to time and at any time enter into an indenture or indentures
supplemental hereto for the purpose of adding any provisions to or changing in
any manner or eliminating any of the provisions of this Indenture or any
supplemental indenture or of modifying in any manner the rights of the holders
of the Notes; PROVIDED, HOWEVER, that no such supplemental indenture shall,
without the consent of the holders of all Notes then outstanding:

         (a)      extend the fixed maturity of any Note, or

         (b)      reduce the rate or extend the time of payment of interest on
any Note, or

         (c)      reduce the principal amount thereof or premium, if any, on any
Note, or

         (d)      reduce any amount payable on redemption or repurchase of any
Note, or

         (e) impair, or change in any respect adverse to the holder of Notes,
the obligation of the Company to repurchase any Note at the option of the holder
upon the happening of a Repurchase Event, or

         (f) impair or adversely affect the right of any Noteholder to institute
suit for the payment of his Note, or

         (g)      change the place where, or currency in which, the Notes are
payable, or

         (h) impair or change in any respect adverse to the Noteholders the
right to convert the Notes into Common Stock subject to the terms set forth
herein, including Section 15.6, or


                                       51
<PAGE>

         (i) modify the provisions of this Indenture with respect to the
subordination of the Notes in a manner adverse to the Noteholders, without the
consent of the holder of each Note so affected,

         (j) reduce the requirements of Section 10.3 for quorum or voting or the
percentage in principal amount of the outstanding Notes of any series, the
consent of whose holders is required for any such supplemental indenture, or the
consent of whose holder is required for any waiver with respect to such series
(or compliance with certain provisions of this Indenture or certain defaults
hereunder and their consequences) provided for in this Indenture, or

         (k) modify any of the provisions of this Section or Section 7.7, except
to increase the required percentage to effect such action or to provide that
certain other provisions of this Indenture cannot be modified or waived without
the consent of the holder of each outstanding Note affected thereby.

         Upon the request of the Company, accompanied by a copy of the
resolutions of the Board of Directors certified by its Secretary or Assistant
Secretary authorizing the execution of any such supplemental indenture, and upon
the filing with the Trustee of evidence of the consent of Noteholders as
aforesaid, the Trustee shall join with the Company in the execution of such
supplemental indenture unless such supplemental indenture affects the Trustee's
own rights, duties or immunities under this Indenture or otherwise, in which
case the Trustee may in is discretion, but shall not be obligated to, enter into
such supplemental indenture.

         It shall not be necessary for the consent of the Noteholders under this
Section 11.2 to approve the particular form of any proposed supplemental
indenture, but it shall be sufficient if such consent shall approve the
substance thereof.

         Section 11.3. EFFECT OF SUPPLEMENTAL INDENTURES. Any supplemental
indenture executed pursuant to the provisions of this Article 11 shall comply
with the Trust Indenture Act, as then in effect. Upon the execution of any
supplemental indenture pursuant to the provisions of this Article 11, this
Indenture shall be and be deemed to be modified and amended in accordance
therewith and the respective rights, limitation of rights, obligations, duties
and immunities under this Indenture of the Trustee, the Company and the holders
of Notes shall thereafter be determined, exercised and enforced hereunder
subject in all respects to such modifications and amendments and all the terms
and conditions of any such supplemental indenture shall be and be deemed to be
part of the terms and conditions of this Indenture for any and all purposes.

         Section 11.4. NOTATION ON NOTES. Notes authenticated and delivered
after the execution of any supplemental indenture pursuant to the provisions of
this Article 11 may bear a notation in form approved by the Trustee as to any
matter provided for in such supplemental indenture. If the Company or the
Trustee shall so determine, new Notes so modified as to conform, in the opinion
of the Trustee and the Board of Directors, to any modification of this Indenture
contained in any such supplemental indenture may, at the Company's expense, be
prepared and


                                       52
<PAGE>

executed by the Company, authenticated by the Trustee (or an authenticating
agent duly appointed by the Trustee pursuant to Section 17.11) and delivered in
exchange for the Notes then outstanding, upon surrender of such Notes then
outstanding.

         Section 11.5. EVIDENCE OF COMPLIANCE OF SUPPLEMENTAL INDENTURE TO BE
FURNISHED TRUSTEE. The Trustee, subject to the provisions of Sections 8.1 and
8.2, may receive an Officers' Certificate and an Opinion of Counsel as
conclusive evidence that any supplemental indenture executed pursuant hereto
complies with the requirements of this Article 11.

                                   ARTICLE 12.

                CONSOLIDATION, MERGER, SALE, CONVEYANCE AND LEASE

         Section 12.1. COMPANY MAY CONSOLIDATE, ETC. ON CERTAIN TERMS. The
Company shall not, directly or indirectly, consolidate with or merge with or
into any other Person or sell, lease, convey or transfer all its properties and
assets substantially as an entirety, whether in a single transaction or a series
of related transactions, to any Person or group of affiliated Persons unless:

                  (a) either (i) in the case of a merger or consolidation that
does not involve a transfer of all or substantially all of the Company's
properties and assets, the Company is the surviving entity or (ii) in case the
Company shall consolidate with or merge into another Person or sell, lease,
convey or transfer all its properties and assets substantially as an entirety,
whether in a single transaction or a series of related transactions, to any
Person, the Person formed by such consolidation or into which the Company is
merged, or the Person which acquires by sale, conveyance or transfer, or which
leases the properties and assets of the Company substantially as an entirety,
shall be a corporation, limited liability company, partnership or trust, shall
be organized and validly existing under the laws of the United States of
America, any state thereof or the District of Columbia and shall expressly
assume, by an indenture supplemental hereto, executed and delivered to the
Trustee, in form satisfactory to the Trustee, the due and punctual payment of
the principal of, premium, if any, and interest on all of the Notes as
applicable, and the performance or observance of every covenant of this
Indenture on the part of the Company to be performed or observed and shall have
provided for the applicable conversion rights set forth in Section 15.6 and the
repurchase rights set forth in Article 15,

                  (b) immediately after giving effect to such transaction, no
Event of Default, and no event that after notice or lapse of time or both, would
become an Event of Default, shall have happened and be continuing; and

                  (c) the Company has delivered to the Trustee an Officers
Certificate and an Opinion of Counsel, each stating that such consolidation,
merger, conveyance, transfer or lease and, if a supplemental indenture is
required in connection with such transaction, such supplemental indenture comply
with this Article and that all conditions precedent herein provided for relating
to such transaction have been complied with, together with any documents
required under Article 9.


                                       53
<PAGE>

         Section 12.2. SUCCESSOR CORPORATION TO BE SUBSTITUTED. In case of any
such consolidation, merger, sale, conveyance or lease in accordance with Section
12.1, and, where required in accordance with Section 12.1(a) upon the assumption
by the successor corporation, by supplemental indenture, executed and delivered
to the Trustee and satisfactory in form to the Trustee, of the due and punctual
payment of the principal of and premium, if any, and interest on all of the
Notes and the due and punctual performance of all of the covenants and
conditions of this Indenture to be performed by the Company, such successor
corporation shall succeed to and be substituted for the Company, with the same
effect as if it had been named herein as the party of the first part. Such
successor corporation thereupon may cause to be signed, and may issue either in
its own name or in the name of the Company any or all of the Notes issuable
hereunder which theretofore shall not have been signed by the Company and
delivered to the Trustee; and, upon the order of such successor corporation
instead of the Company and subject to all the terms, conditions and limitations
in this Indenture prescribed, the Trustee shall authenticate and shall deliver,
or cause to be authenticated and delivered, any Notes which previously shall
have been signed and delivered by the officers of the Company to the Trustee for
authentication, and any Notes which such successor corporation thereafter shall
cause to be signed and delivered to the Trustee for that purpose. All the Notes
so issued shall in all respects have the same legal rank and benefit under this
Indenture as the Notes theretofore or thereafter issued in accordance with the
terms of this Indenture as though all of such Notes had been issued at the date
of the execution hereof. In the event of any such consolidation, merger, sale,
conveyance or lease, the person named as the "Company" in the first paragraph of
this Indenture or any successor which shall thereafter have become such in the
manner prescribed in this Article 12 may be dissolved, wound up and liquidated
at any time thereafter and such person shall be released from its liabilities as
obligor and maker of the Notes and from its obligations under this Indenture.

         In case of any such consolidation, merger, sale, conveyance or lease,
such changes in phraseology and form (but not in substance) may be made in the
Notes thereafter to be issued as may be appropriate.

         Section 12.3. OPINION OF COUNSEL TO BE GIVEN TRUSTEE. The Trustee,
subject to Sections 8.1 and 8.2, shall receive an Officers' Certificate and an
Opinion of Counsel as conclusive evidence that any such consolidation, merger,
sale, conveyance or lease and any such assumption complies with the provisions
of this Article 12.


                                       54
<PAGE>

                                   ARTICLE 13.

                     SATISFACTION AND DISCHARGE OF INDENTURE

         Section 13.1. DISCHARGE OF INDENTURE. When (a) the Company shall
deliver to the Trustee for cancellation all Notes theretofore authenticated
(other than any Notes which have been destroyed, lost or stolen and in lieu of
or in substitution for which other Notes shall have been authenticated and
delivered) and not theretofore canceled, or (b) all the Notes not theretofore
canceled or delivered to the Trustee for cancellation shall have become due and
payable, or are by their terms to become due and payable within one year or are
to be called for redemption within one year under arrangements satisfactory to
the Trustee for the giving of notice of redemption, and the Company shall
deposit with the Trustee, in trust, funds sufficient to pay at maturity or upon
redemption of all of the Notes (other than any Notes which shall have been
mutilated, destroyed, lost or stolen and in lieu of or in substitution for which
other Notes shall have been authenticated and delivered) not theretofore
canceled or delivered to the Trustee for cancellation, including principal and
premium, if any, and interest due or to become due to such date of maturity or
redemption date, as the case may be, and if in either case the Company shall
also pay or cause to be paid all other sums payable hereunder by the Company,
then this Indenture shall cease to be of further effect (except as to (i)
remaining rights of registration of transfer, substitution and exchange and
conversion of Notes, (ii) rights hereunder of Noteholders to receive payments of
principal of and premium, if any, and interest on, the Notes and the other
rights, duties and obligations of Noteholders, as beneficiaries hereof with
respect to the amounts, if any, so deposited with the Trustee and (iii) the
rights, obligations and immunities of the Trustee hereunder), and the Trustee,
on demand of the Company accompanied by an Officers' Certificate and an Opinion
of Counsel as required by Section 17.5 and at the cost and expense of the
Company, shall execute proper instruments acknowledging satisfaction of and
discharging this Indenture; the Company, however, hereby agreeing to reimburse
the Trustee for any costs or expenses thereafter reasonably and properly
incurred by the Trustee and to compensate the Trustee for any services
thereafter reasonably and properly rendered by the Trustee in connection with
this Indenture or the Notes.

         Section 13.2. DEPOSITED MONIES TO BE HELD IN TRUST BY TRUSTEE. Subject
to Section 13.4, all monies deposited with the Trustee pursuant to Section 13.1
shall be held in trust and applied by it to the payment, notwithstanding the
provisions of Article 4, either directly or through any paying agent (including
the Company if acting as its own paying agent), to the holders of the particular
Notes for the payment or redemption of which such monies have been deposited
with the Trustee, of all sums due and to become due thereon for principal and
interest and premium, if any.

         Section 13.3. PAYING AGENT TO REPAY MONIES HELD. Upon the satisfaction
and discharge of this Indenture, all monies then held by any paying agent of the
Notes (other than the Trustee) shall, upon demand of the Company, be repaid to
it or paid to the Trustee, and thereupon such paying agent shall be released
from all further liability with respect to such monies.


                                       55
<PAGE>

         Section 13.4. RETURN OF UNCLAIMED MONIES. Subject to the requirements
of applicable law, any monies deposited with or paid to the Trustee for payment
of the principal of, premium, if any, or interest on Notes and not applied but
remaining unclaimed by the holders of Notes for two years after the date upon
which the principal of, premium, if any, or interest on such Notes, as the case
may be, shall have become due and payable, shall be repaid to the Company by the
Trustee on demand and all liability of the Trustee shall thereupon cease with
respect to such monies; and the holder of any of the Notes shall thereafter look
only to the Company for any payment which such holder may be entitled to collect
unless an applicable abandoned property law designates another person.

         Section 13.5. REINSTATEMENT. If (i) the Trustee or the paying agent is
unable to apply any money in accordance with Section 13.2 by reason of any order
or judgment of any court or governmental authority enjoining, restraining or
otherwise prohibiting such application and (ii) the holders of at least a
majority in principal amount of the then outstanding Notes so request by written
notice to the Trustee, the Company's obligations under this Indenture and the
Notes shall be revived and reinstated as though no deposit had occurred pursuant
to Section 13.1 until such time as the Trustee or the paying agent is permitted
to apply all such money in accordance with Section 13.2; PROVIDED, HOWEVER, that
if the Company makes any payment of interest on or principal of any Note
following the reinstatement of its obligations, the Company shall be subrogated
to the rights of the holders of such Notes to receive such payment from the
money held by the Trustee or paying agent.

                                   ARTICLE 14.

         IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS

         Section 14.1. INDENTURE AND NOTES SOLELY CORPORATE OBLIGATIONS. No
recourse for the payment of the principal of or premium, if any, or interest on
any Note, or for any claim based thereon or otherwise in respect thereof, and no
recourse under or upon any obligation, covenant or agreement of the Company in
this Indenture or in any supplemental indenture or in any Note, or because of
the creation of any indebtedness represented thereby, shall be had against any
incorporator, stockholder, employee, agent, officer or director or subsidiary,
as such, past, present or future, of the Company or of any successor
corporation, either directly or through the Company or any successor
corporation, whether by virtue of any constitution, statute or rule of law, or
by the enforcement of any assessment or penalty or otherwise; it being expressly
understood that all such liability is hereby expressly waived and released as a
condition of, and as a consideration for, the execution of this Indenture and
the issue of the Notes.


                                       56
<PAGE>

                                   ARTICLE 15.

                               CONVERSION OF NOTES

         Section 15.1. RIGHT TO CONVERT. Subject to and upon compliance with
the provisions of this Indenture, the holder of any Note shall have the right,
at his option, at any time following the date of original issuance of the Notes
and prior to the close of business on March 15, 2005 (except that, with
respect to any Note or portion of a Note which shall be called for redemption,
such right shall terminate, except as provided in the fifth paragraph of Section
15.2 and Section 3.4, at the close of business on the Business Day next
preceding the date fixed for redemption or repurchase of such Note or portion of
a Note unless the Company shall default in payment due upon redemption or
repurchase, as applicable, thereof) to convert the principal amount of any such
Note, or any portion of such principal amount which is $1,000 or an integral
multiple thereof, into that number of fully paid and non-assessable shares of
Common Stock (as such shares shall then be constituted) obtained by dividing the
principal amount of the Note or portion thereof surrendered for conversion by
the Conversion Price in effect at such time, by surrender of the Note so to be
converted in whole or in part in the manner provided in Section 15.2. A holder
of Notes is not entitled to any rights of a holder of Common Stock until such
holder has converted his Notes to Common Stock, and only to the extent such
Notes are deemed to have been converted to Common Stock under this Article 15. A
Note with respect to which a holder has delivered a notice in accordance with
Section 16.2 regarding such holder's election to require the Company to
repurchase such holder's Notes following the occurrence of a Repurchase Event
may be converted in accordance with this Article 15 only if such holder
withdraws such notice by delivering a written notice of withdrawal to the
Company prior to the close of business on last Business Day prior to the day
fixed for repurchase.

         Section 15.2. EXERCISE OF CONVERSION PRIVILEGE; ISSUANCE OF COMMON
STOCK ON CONVERSION; NO ADJUSTMENT FOR INTEREST OR DIVIDENDS. In order to
exercise the conversion privilege with respect to any Note in definitive form,
the holder of any such Note to be converted in whole or in part shall surrender
such Note, duly endorsed, at an office or agency maintained by the Company
pursuant to Section 5.2, accompanied by the funds, if any, required by the
penultimate paragraph of this Section 15.2, and shall give written notice of
conversion in the form provided on the Notes (or such other notice which is
acceptable to the Company) to the office or agency that the holder elects to
convert such Note or such portion thereof specified in said notice. Such notice
shall also state the name or names (with address) in which the certificate or
certificates for shares of Common Stock which shall be issuable on such
conversion shall be issued, and shall be accompanied by transfer taxes, if
required pursuant to Section 15.7. Each such Note surrendered for conversion
shall, unless the shares issuable on conversion are to be issued in the same
name as the registration of such Note, be duly endorsed by, or be accompanied by
instruments of transfer in form satisfactory to the Company duly executed by,
the holder or his duly authorized attorney.


                                       57
<PAGE>

         In order to exercise the conversion privilege with respect to any
interest in the Global Note, the beneficial holder must complete the appropriate
instruction form for conversion pursuant to the Depositary's book-entry
conversion program, deliver by book-entry delivery an interest in the Global
Note, furnish appropriate endorsements and transfer documents if required by the
Company or the Trustee or conversion agent, and pay the funds, if any, required
by the penultimate paragraph of this Section 15.2 and any transfer taxes, if
required pursuant to Section 15.7.

         As promptly as practicable after satisfaction of the requirements for
conversion set forth above, subject to compliance with any restrictions on
transfer if shares issuable on conversion are to be issued in a name other than
that of the Noteholder (as if such transfer were a transfer of the Note or Notes
(or portion thereof) so converted), the Company shall issue and shall deliver to
such holder at the office or agency maintained by the Company for such purpose
pursuant to Section 5.2, a certificate or certificates for the number of full
shares of Common Stock issuable upon the conversion of such Note or portion
thereof in accordance with the provisions of this Article and a check or cash in
respect of any fractional interest in respect of a share of Common Stock arising
upon such conversion, as provided in Section 15.3 (which payment, if any, shall
be paid no later than five Business Days after satisfaction of the requirements
for conversion set forth above). In case any Note of a denomination greater than
$1,000 shall be surrendered for partial conversion, and subject to Section 2.3,
the Company shall execute and the Trustee shall authenticate and deliver to the
holder of the Note so surrendered, without charge to him, a new Note or Notes in
authorized denominations in an aggregate principal amount equal to the
unconverted portion of the surrendered Note.

         Each conversion shall be deemed to have been effected as to any such
Note (or portion thereof) on the date on which the requirements set forth above
in this Section 15.2 have been satisfied as to such Note (or portion thereof),
and the person in whose name any certificate or certificates for shares of
Common Stock shall be issuable upon such conversion shall be deemed to have
become on said date the holder of record of the shares represented thereby;
PROVIDED, HOWEVER, that any such surrender on any date when the stock transfer
books of the Company shall be closed shall constitute the person in whose name
the certificates are to be issued as the record holder thereof for all purposes
on the next succeeding day on which such stock transfer books are open, but such
conversion shall be at the Conversion Price in effect on the date upon which
such Note shall be surrendered.

         Any Note or portion thereof surrendered for conversion during the
period from the close of business on the record date for any interest payment
date through the opening of business on the Business Day next preceding such
interest payment date shall (unless such Note or portion thereof being converted
shall have been called for redemption pursuant to a redemption notice mailed to
the Noteholders in accordance with Section 3.2 or eligible for repurchase
pursuant to a Company Notice mailed to the Noteholders in accordance with
Section 16.2) be accompanied by payment, in New York Clearing House funds or
other funds acceptable to the Company, of an amount equal to the interest
otherwise payable on such interest payment date on the principal amount being
converted; PROVIDED, HOWEVER, that no such payment need be made if there shall


                                       58
<PAGE>

exist at the time of conversion a default in the payment of interest on the
Notes. Except as provided above in this Section 15.2, no adjustment shall be
made for interest accrued on any Note converted or for dividends on any shares
issued upon the conversion of such Note as provided in this Article.

         Upon the conversion of an interest in the Global Note, the Trustee, or
the Custodian at the direction of the Trustee, shall make a notation on the
Global Note as to the reduction in the principal amount represented thereby.

         Section 15.3. CASH PAYMENTS IN LIEU OF FRACTIONAL SHARES. No
fractional shares of Common Stock or scrip representing fractional shares shall
be issued upon conversion of Notes. If more than one Note shall be surrendered
for conversion at one time by the same holder, the number of full shares which
shall be issuable upon conversion shall be computed on the basis of the
aggregate principal amount of the Notes (or specified portions thereof to the
extent permitted hereby) so surrendered for conversion. If any fractional share
of stock otherwise would be issuable upon the conversion of any Note or Notes,
the Company shall make an adjustment therefor in cash at the current market
value thereof to the holder of Notes. The current market value of a share of
Common Stock shall be the Closing Price on the first Trading Day immediately
preceding the day on which the Notes (or specified portions thereof) are deemed
to have been converted and such Closing Price shall be determined as provided in
Section 15.5(h).

         Section 15.4. CONVERSION PRICE. The conversion price shall be as
specified in the form of Note (herein called the "Conversion Price") attached as
Exhibit A hereto, subject to adjustment as provided in this Article 15.

         Section 15.5. ADJUSTMENT OF CONVERSION PRICE.  The Conversion Price
shall be adjusted from time to time by the Company as follows:

         (a) In case the Company shall hereafter pay a dividend or make a
distribution on any class of capital stock of the Company payable in shares of
Common Stock, the Conversion Price in effect at the opening of business on the
date following the date fixed for the determination of stockholders entitled to
receive such dividend or other distribution shall be reduced by multiplying such
Conversion Price by a fraction of which the numerator shall be the number of
shares of Common Stock outstanding at the close of business on the Record Date
(as defined in Section 15.5(h)) fixed for such determination and the denominator
shall be the sum of such number of shares and the total number of shares
constituting such dividend or other distribution, such reduction to become
effective immediately after the opening of business on the day following the
Record Date. If any dividend or distribution of the type described in this
Section 15.5(a) is declared but not so paid or made, the Conversion Price shall
again be adjusted to the Conversion Price which would then be in effect if such
dividend or distribution had not been declared.

         (b) In case the Company shall issue rights, options or warrants to all
holders of its outstanding shares of Common Stock (other than any rights,
options or warrants that by their


                                       59
<PAGE>

terms will also be issued to any Noteholder upon conversion of a Note into
Common Stock without any action required by the Company or any other person)
entitling them to subscribe for or purchase shares of Common Stock at a price
per share less than the Current Market Price (as defined in Section 15.5(h)) on
the Record Date fixed for the determination of stockholders entitled to receive
such rights, options or warrants, the Conversion Price shall be adjusted so that
the same shall equal the price determined by multiplying the Conversion Price in
effect at the opening of business on the date after such Record Date by a
fraction of which the numerator shall be the number of shares of Common Stock
outstanding at the close of business on the Record Date plus the number of
shares which the aggregate offering price of the total number of shares so
offered for subscription or purchase would purchase at such Current Market
Price, and of which the denominator shall be the number of shares of Common
Stock outstanding on the close of business on the Record Date plus the total
number of additional shares of Common Stock so offered for subscription or
purchase. Such adjustment shall become effective immediately after the opening
of business on the day following the Record Date fixed for determination of
stockholders entitled to receive such rights or warrants. To the extent that
shares of Common Stock are not delivered pursuant to such rights, options or
warrants, upon the expiration or termination of such rights or warrants the
Conversion Price shall be readjusted to the Conversion Price which would then be
in effect had the adjustments made upon the issuance of such rights or warrants
been made on the basis of delivery of only the number of shares of Common Stock
actually delivered. In the event that such rights or warrants are not so issued,
the Conversion Price shall again be adjusted to be the Conversion Price which
would then be in effect if such date fixed for the determination of stockholders
entitled to receive such rights or warrants had not been fixed. In determining
whether any rights or warrants entitle the holders to subscribe for or purchase
shares of Common Stock at less than such Current Market Price, and in
determining the aggregate offering price of such shares of Common Stock, there
shall be taken into account any consideration received for such rights or
warrants, the value of such consideration, if other than cash, to be determined
by the Board of Directors.

         Not in limitation of the foregoing, in the event that the Company
implements a stockholder rights plan, such rights plan shall provide that upon
conversion of the Notes the holders will receive, in addition to the Common
Stock issuable upon such conversion, the rights issued under such rights plan
(notwithstanding the occurrence of an event causing such rights to separate from
the Common Stock at or prior to the time of conversion). Any distribution of
rights, options or warrants pursuant to a stockholder rights plan complying with
the requirements set forth in the immediately preceding sentence of this
paragraph shall not constitute a distribution of rights, options or warrants for
the purposes of this Section 15.5(d).

         Rights, options or warrants distributed by the Company to all holders
of Common Stock entitling the holders thereof to subscribe for or purchase
shares of the Company's capital stock (either initially or under certain
circumstances), which rights, options or warrants, until the occurrence of a
specified event or events ("Trigger Event"): (i) are deemed to be transferred
with such shares of Common Stock; (ii) are not exercisable; and (iii) are also
issued in respect of future issuances of Common Stock, shall be deemed not to
have been distributed for purposes of this Section 15.5(b) (and no adjustment to
the Conversion Price under this Section 15.5(b) will


                                       60
<PAGE>

be required) until the occurrence of the earliest Trigger Event. If such right,
option or warrant is subject to subsequent events, upon the occurrence of which
such right or warrant shall become exercisable to purchase different securities,
evidences of indebtedness or other assets or entitle the holder to purchase a
different number or amount of the foregoing or to purchase any of the foregoing
at a different purchase price, then the occurrence of each such event shall be
deemed to be the date of issuance and record date with respect to a new right,
option or warrant (and a termination or expiration of the existing right, option
or warrant without exercise by the holder thereof). In addition, in the event of
any distribution (or deemed distribution) of rights, options or warrants, or any
Trigger Event or other event (of the type described in the preceding sentence)
with respect thereto, that resulted in an adjustment to the Conversion Price
under this Section 15.5(b), (1) in the case of any such rights, options or
warrants which shall all have been redeemed or repurchased without exercise by
any holders thereof, the Conversion Price shall be readjusted upon such final
redemption or repurchase to give effect to such distribution or Trigger Event,
as the case may be, as though it were a cash distribution, equal to the per
share redemption or repurchase price received by a holder of Common Stock with
respect to such rights or warrants (assuming such holder had retained such
rights, options or warrants), made to all holders of Common Stock as of the date
of such redemption or repurchase, and (2) in the case of such rights, options or
warrants all of which shall have expired or been terminated without exercise,
the Conversion Price shall be readjusted as if such rights and warrants had
never been issued.

         (c) In case the outstanding shares of Common Stock shall be subdivided
into a greater number of shares of Common Stock, the Conversion Price in effect
at the opening of business on the day following the day upon which such
subdivision becomes effective shall be proportionately reduced, and conversely,
in case outstanding shares of Common Stock shall be combined into a smaller
number of shares of Common Stock, the Conversion Price in effect at the opening
of business on the day following the day upon which such combination becomes
effective shall be proportionately increased, such reduction or increase, as the
case may be, to become effective immediately after the opening of business on
the day following the day upon which such subdivision or combination becomes
effective.

         (d) In case the Company shall, by dividend or otherwise, distribute to
all holders of its Common Stock shares of any class of capital stock of the
Company (other than any dividends or distributions to which Section 15.5(a)
applies) or evidences of its indebtedness, cash or other assets (including
securities, but excluding (1) any rights, options or warrants referred to in
Section 15.5(b) and, (2) dividends and distributions exclusively in cash (the
foregoing hereinafter in this Section 15.5(d) called the "Securities")), unless
the Company elects to reserve such Securities for distribution to the
Noteholders upon conversion of the Notes so that any such holder converting
Notes will receive upon such conversion, without any additional action on the
part of the Company or the Noteholder and in addition to the shares of Common
Stock to which such holder is entitled, the amount and kind of such Securities
which such holder would have received if such holder had converted its Notes
into Common Stock immediately prior to the Record Date (as defined in Section
15.5(h) for such distribution of the Securities) then, in each such case, the
Conversion Price shall be reduced so that the same shall be equal to the price


                                       61
<PAGE>

determined by multiplying the Conversion Price in effect immediately prior to
the close of business on the Record Date (as defined in Section 15.5(h)) with
respect to such distribution by a fraction of which the numerator shall be the
Current Market Price (determined as provided in Section 15.5(h)) on such date
less the fair market value (as determined by the Board of Directors, whose
determination shall be conclusive and described in a Board Resolution) on such
date of the portion of the Securities so distributed applicable to one share of
Common Stock and the denominator shall be such Current Market Price, such
reduction to become effective immediately prior to the opening of business on
the day following the Record Date; PROVIDED, HOWEVER, that in the event the then
fair market value (as so determined) of the portion of the Securities so
distributed applicable to one share of Common Stock is equal to or greater than
the Current Market Price on the Record Date, in lieu of the foregoing
adjustment, adequate provision shall be made so that each Noteholder shall have
the right to receive upon conversion of a Note (or any portion thereof) the
amount of Securities such holder would have received had such holder converted
such Note (or portion thereof) immediately prior to such Record Date. In the
event that such dividend or distribution is not so paid or made, the Conversion
Price shall again be adjusted to be the Conversion Price which would then be in
effect if such dividend or distribution had not been declared. If the Board of
Directors determines the fair market value of any distribution for purposes of
this Section 15.5(d) by reference to the actual or when issued trading market
for any securities comprising all or part of such distribution, it must in doing
so consider the prices in such market over the same period (the "Reference
Period") used in computing the Current Market Price pursuant to Section 15.5(h)
to the extent possible, unless the Board of Directors in a board resolution
determines in good faith that determining the fair market value during the
Reference Period would not be in the best interest of the Noteholder.

         For purposes of this Section 15.5(d) and Sections 15.5(a) and (b), any
dividend or distribution to which this Section 15.5(d) is applicable that also
includes shares of Common Stock, or rights, options or warrants to subscribe for
or purchase shares of Common Stock to which Section 15.5(b) applies (or both),
shall be deemed instead to be (1) a dividend or distribution of the evidences of
indebtedness, assets, shares of capital stock, rights or warrants other than
such shares of Common Stock or rights or warrants to which Section 15.5(b)
applies (and any Conversion Price reduction required by this Section 15.5(d)
with respect to such dividend or distribution shall then be made) immediately
followed by (2) a dividend or distribution of such shares of Common Stock or
such rights or warrants (and any further Conversion Price reduction required by
Sections 15.5(a) and (b) with respect to such dividend or distribution shall
then be made, except (A) the Record Date of such dividend or distribution shall
be substituted as "the date fixed for the determination of stockholders entitled
to receive such dividend or other distribution", "Record Date fixed for such
determination" and "Record Date" within the meaning of Section 15.5(a) and as
"the date fixed for the determination of stockholders entitled to receive such
rights or warrants", "the Record Date fixed for the determination of the
stockholders entitled to receive such rights or warrants" and "such Record Date"
within the meaning of Section 15.5(b) and (B) any shares of Common Stock
included in such dividend or distribution shall not be deemed "outstanding at
the close of business on the date fixed for such determination" within the
meaning of Section 15.5(a).


                                       62
<PAGE>

         (e) In case the Company shall, by dividend or otherwise, distribute to
all holders of its Common Stock cash (excluding any cash that is distributed
upon a merger or consolidation to which Section 15.6 applies or as part of a
distribution referred to in Section 15.5(d)), in an aggregate amount that,
combined together with (1) the aggregate amount of any other such distributions
to all holders of its Common Stock made exclusively in cash within the twelve
(12) months preceding the date of payment of such distribution, and in respect
of which no adjustment pursuant to this Section 15.5(e) has been made, and (2)
the aggregate of any cash plus the fair market value (as determined by the Board
of Directors, whose determination shall be conclusive and described in a Board
Resolution) of consideration payable in respect of any tender offer by the
Company or any of its subsidiaries for all or any portion of the Common Stock
concluded within the twelve (12) months preceding the date of payment of such
distribution, and in respect of which no adjustment pursuant to Section 15.5(f)
has been made, exceeds 10% of the product of the Current Market Price
(determined as provided in Section 15.5(h)) on the Record Date with respect to
such distribution times the number of shares of Common Stock outstanding on such
date, then, and in each such case, immediately after the close of business on
such date, the Conversion Price shall be reduced so that the same shall equal
the price determined by multiplying the Conversion Price in effect immediately
prior to the close of business on such Record Date by a fraction (i) the
numerator of which shall be equal to the Current Market Price on the Record Date
less an amount equal to the quotient of (x) the excess of such combined amount
over such 10% and (y) the number of shares of Common Stock outstanding on the
Record Date and (ii) the denominator of which shall be equal to the Current
Market Price on such date; PROVIDED, HOWEVER, that in the event the portion of
the cash so distributed applicable to one share of Common Stock is equal to or
greater than the Current Market Price of the Common Stock on the Record Date, in
lieu of the foregoing adjustment, adequate provision shall be made so that each
Noteholder shall have the right to receive upon conversion of a Note (or any
portion thereof) the amount of cash such holder would have received had such
holder converted such Note (or portion thereof) immediately prior to such Record
Date. In the event that such dividend or distribution is not so paid or made,
the Conversion Price shall again be adjusted to be the Conversion Price which
would then be in effect if such dividend or distribution had not been declared.
Any cash distribution to all holders of Common Stock as to which the Company
makes the election permitted by Section 15.5(n) and as to which the Company has
complied with the requirements of such Section shall be treated as not having
been made for all purposes of this Section 15.5(e)).

         (f) In case a tender offer made by the Company or any Subsidiary for
all or any portion of the Common Stock shall expire and such tender offer (as
amended upon the expiration thereof) shall require the payment to stockholders
(based on the acceptance (up to any maximum specified in the terms of the tender
offer) of Purchased Shares (as defined below)) of an aggregate consideration
having a fair market value (as determined by the Board of Directors, whose
determination shall be conclusive and described in a Board Resolution) that
combined together with (1) the aggregate of the cash plus the fair market value
(as determined by the Board of Directors, whose determination shall be
conclusive and described in a Board Resolution), as of the expiration of such
tender offer, of consideration payable in respect of any other tender offers, by
the Company or any of its subsidiaries for all or any portion of the Common
Stock


                                       63
<PAGE>

expiring within the twelve (12) months preceding the expiration of such tender
offer and in respect of which no adjustment pursuant to this Section 15.5(f) has
been made and (2) the aggregate amount of any distributions to all holders of
the Company's Common Stock made exclusively in cash within twelve (12) months
preceding the expiration of such tender offer and in respect of which no
adjustment pursuant to Section 15.5(e) has been made, exceeds 10% of the product
of the Current Market Price (determined as provided in Section 15.5(h)) as of
the last time (the "Expiration Time") tenders could have been made pursuant to
such tender offer (as it may be amended) times the number of shares of Common
Stock outstanding (including any tendered shares) on the Expiration Time, then,
and in each such case, immediately prior to the opening of business on the day
after the date of the Expiration Time, the Conversion Price shall be adjusted so
that the same shall equal the price determined by multiplying the Conversion
Price in effect immediately prior to close of business on the date of the
Expiration Time by a fraction of which the numerator shall be the number of
shares of Common Stock outstanding (including any tendered shares) on the
Expiration Time multiplied by the Current Market Price of the Common Stock on
the Trading Day next succeeding the Expiration Time and the denominator shall be
the sum of (x) the fair market value (determined as aforesaid) of the aggregate
consideration payable to stockholders based on the acceptance (up to any maximum
specified in the terms of the tender offer) of all shares validly tendered and
not withdrawn as of the Expiration Time (the shares deemed so accepted, up to
any such maximum, being referred to as the "Purchased Shares") and (y) the
product of the number of shares of Common Stock outstanding (less any Purchased
Shares) on the Expiration Time and the Current Market Price of the Common Stock
on the Trading Day next succeeding the Expiration Time, such reduction (if any)
to become effective immediately prior to the opening of business on the day
following the Expiration Time. In the event that the Company is obligated to
purchase shares pursuant to any such tender offer, but the Company is
permanently prevented by applicable law from effecting any such purchases or all
such purchases are rescinded, the Conversion Price shall again be adjusted to be
the Conversion Price which would then be in effect if such tender offer had not
been made. If the application of this Section 15.5(f) to any tender offer would
result in an increase in the Conversion Price, no adjustment shall be made for
such tender offer under this Section 15.5(f). Any cash distribution to all
holders of Common Stock as to which the Company has made the election permitted
by Section 15.5(n) and as to which the Company has complied with the
requirements of such Section shall be treated as not having been made for all
purposes of this Section 15.5(f).

         (g) In case of a tender or exchange offer made by a person other than
the Company or any Subsidiary for an amount which increases the offeror's
ownership of Common Stock to more than 25% of the Common Stock outstanding and
shall involve the payment by such person of consideration per share of Common
Stock having a fair market value (as determined by the Board of Directors),
whose determination shall be conclusive, and described in a resolution of the
Board of Directors at the last time (the "Expiration Time") tenders or exchanges
may be made pursuant to such tender or exchange offer (as it shall have been
amended) that exceeds the Current Market Price of the Common Stock on the
Trading Day next succeeding the Expiration Time, and in which, as of the
Expiration Time the Board of Directors is not recommending rejection of the
offer, the Conversion Price shall be reduced so that the same shall equal the
price


                                       64
<PAGE>

determined by multiplying the Conversion Price in effect immediately prior to
the Expiration Time by a fraction of which the numerator shall be the number of
shares of Common Stock outstanding (including any tendered or exchanged shares)
on the Expiration Time multiplied by the current Market Price of the Common
Stock on the Trading Day next succeeding the Expiration Time and the denominator
shall be the sum of (x) the fair market value (determined as aforesaid) of the
aggregate consideration payable to stockholders based on the acceptance (up to
any maximum specified in the terms of the tender or exchange offer) of all
shares validly tendered or exchanged and not withdrawn as of the Expiration Time
(the shares deemed so accepted, up to any such maximum, being referred to as the
"Purchased Shares") and (y) the product of the number of shares of Common Stock
outstanding (less any Purchased Shares) on the Expiration Time and the Current
Market Price of the Common Stock on the Trading Day next succeeding the
Expiration Time, such reduction to become effective immediately prior to the
opening of business on the day following the Expiration Time. In the event that
such person is obligated to purchase shares pursuant to any such tender or
exchange offer, but such person is permanently prevented by applicable law from
effecting any such purchases or all such purchases are rescinded, the Conversion
Price shall again be adjusted to be the Conversion Price which would then be in
effect if such tender or exchange offer had not been made. Notwithstanding the
foregoing, the adjustment described in this Section 15.5(g) shall not be made
if, as of the Expiration Time, the offering documents with respect to such offer
disclose a plan or intention to cause the Company to engage in any transaction
described in Article 12.

         (h) For purposes of this Section 15.5, the following terms shall have
the meaning indicated:

                                    (1) "Closing Price" with respect to any
                  securities on any day shall mean the closing sale price
                  regular way on such day or, in case no such sale takes place
                  on such day, the average of the reported closing bid and asked
                  prices, regular way, in each case on the Nasdaq National
                  Market or New York Stock Exchange, as applicable, or, if such
                  security is not listed or admitted to trading on such National
                  Market or Exchange, on the principal national security
                  exchange or quotation system on which such security is quoted
                  or listed or admitted to trading, or, if not quoted or listed
                  or admitted to trading on any national securities exchange or
                  quotation system, the average of the closing bid and asked
                  prices of such security on the over-the-counter market on the
                  day in question as reported by the National Quotation Bureau
                  Incorporated, or a similar generally accepted reporting
                  service, or if not so available, in such manner as furnished
                  by any New York Stock Exchange member firm selected from time
                  to time by the Board of Directors for that purpose, or a price
                  determined in good faith by the Board of Directors, whose
                  determination shall be conclusive and described in a Board
                  Resolution.

                                    (2) "Current Market Price" shall mean the
                  average of the daily Closing Prices per share of Common Stock
                  for the ten (10) consecutive Trading Days immediately prior to
                  the date in question; PROVIDED, HOWEVER, that (1) if the


                                       65
<PAGE>

                  "ex" date (as hereinafter defined) for any event (other than
                  the issuance or distribution requiring such computation) that
                  requires an adjustment to the Conversion Price pursuant to
                  Section 15.5(a), (b), (c), (d), (e), (f) or (g) occurs during
                  such ten (10) consecutive Trading Days, the Closing Price for
                  each Trading Day prior to the "ex" date for such other event
                  shall be adjusted by multiplying such Closing Price by the
                  same fraction by which the Conversion Price is so required to
                  be adjusted as a result of such other event, (2) if the "ex"
                  date for any event (other than the issuance or distribution
                  requiring such computation) that requires an adjustment to the
                  Conversion Price pursuant to Section 15.5(a), (b), (c), (d),
                  (e), (f) or (g) occurs on or after the "ex" date for the
                  issuance or distribution requiring such computation and prior
                  to the day in question, the Closing Price for each Trading Day
                  on and after the "ex" date for such other event shall be
                  adjusted by multiplying such Closing Price by the reciprocal
                  of the fraction by which the Conversion Price is so required
                  to be adjusted as a result of such other event, and (3) if the
                  "ex" date for the issuance or distribution requiring such
                  computation is prior to the day in question, after taking into
                  account any adjustment required pursuant to clause (1) or (2)
                  of this proviso, the Closing Price for each Trading Day on or
                  after such "ex" date shall be adjusted by adding thereto the
                  amount of any cash and the fair market value (as determined by
                  the Board of Directors in a manner consistent with any
                  determination of such value for purposes of Section 15.5(d),
                  (f) or (g), whose determination shall be conclusive and
                  described in a Board Resolution) of the evidences of
                  indebtedness, shares of capital stock or assets being
                  distributed applicable to one share of Common Stock as of the
                  close of business on the day before such "ex" date. For
                  purposes of any computation under Sections 15.5(f) or (g), the
                  Current Market Price of the Common Stock on any date shall be
                  deemed to be the average of the daily Closing Prices per share
                  of Common Stock for such day and the next two succeeding
                  Trading Days; PROVIDED, HOWEVER, that if the "ex" date for any
                  event (other than the tender offer requiring such computation)
                  that requires an adjustment to the Conversion Price pursuant
                  to Section 15.5(a), (b), (c), (d), (e), (f) and (g) occurs on
                  or after the Expiration Time for the tender or exchange offer
                  requiring such computation and prior to the day in question,
                  the Closing Price for each Trading Day on and after the "ex"
                  date for such other event shall be adjusted by multiplying
                  such Closing Price by the reciprocal of the fraction by which
                  the Conversion Price is so required to be adjusted as a result
                  of such other event. For purposes of this paragraph, the term
                  "ex" date, (1) when used with respect to any issuance or
                  distribution, means the first date on which the Common Stock
                  trades regular way on the relevant exchange or in the relevant
                  market from which the Closing Price was obtained without the
                  right to receive such issuance or distribution, (2) when used
                  with respect to any subdivision or combination of shares of
                  Common Stock, means the first date on which the Common Stock
                  trades regular way on such exchange or in such market after
                  the time at which such subdivision or combination becomes
                  effective, and (3) when used with respect to any tender or
                  exchange offer means the first date on which


                                       66
<PAGE>

                  the Common Stock trades regular way on such exchange or in
                  such market after the Expiration Time of such offer.
                  Notwithstanding the foregoing, whenever successive adjustments
                  to the Conversion Price are called for pursuant to this
                  Section 15.5, such adjustments shall be made to the Current
                  Market Price as may be necessary or appropriate to effectuate
                  the intent of this Section 15.5 and to avoid unjust or
                  inequitable results as determined in good faith by the Board
                  of Directors.

                                    (3) "fair market value" shall mean the
                  amount which a willing buyer would pay a willing seller in an
                  arm's length transaction.

                                    (4) "Record Date" shall mean, with respect
                  to any dividend, distribution or other transaction or event in
                  which the holders of Common Stock have the right to receive
                  any cash, securities or other property or in which the Common
                  Stock (or other applicable security) is exchanged for or
                  converted into any combination of cash, securities or other
                  property, the date fixed for determination of stockholders
                  entitled to receive such cash, securities or other property
                  (whether such date is fixed by the Board of Directors or by
                  statute, contract or otherwise).

                                    (5) "Trading Day" shall mean (x) if the
                  applicable security is listed or admitted for trading on the
                  New York Stock Exchange or another national security exchange,
                  a day on which the New York Stock Exchange or another national
                  security exchange is open for business or (y) if the
                  applicable security is quoted on the Nasdaq National Market, a
                  day on which trades may be made thereon or (z) if the
                  applicable security is not so listed, admitted for trading or
                  quoted, any day other than a Saturday or Sunday or a day on
                  which banking institutions in the State of New York are
                  authorized or obligated by law or executive order to close.

          (i) The Company may make such reductions in the Conversion Price, in
addition to those required by Sections 15.5(a), (b), (c), (d), (e), (f) and (g),
as the Board of Directors considers to be advisable to avoid or diminish any
income tax to holders of Common Stock or rights to purchase Common Stock
resulting from any dividend or distribution of stock (or rights to acquire
stock) or from any event treated as such for income tax purposes.

         To the extent permitted by applicable law, the Company from time to
time may reduce the Conversion Price by any amount for any period of time if the
period is at least twenty (20) days, the reduction is irrevocable during the
period and the Board of Directors shall have made a determination that such
reduction would be in the best interests of the Company, which determination
shall be conclusive and described in a Board Resolution. Whenever the Conversion
Price is reduced pursuant to the preceding sentence, the Company shall mail to
the holder of each Note at his last address appearing on the Note register
provided for in Section 2.5 a notice of the reduction at least fifteen (15) days
prior to the date the reduced Conversion Price


                                       67
<PAGE>

takes effect, and such notice shall state the reduced Conversion Price and the
period during which it will be in effect.

         (j) No adjustment in the Conversion Price shall be required unless such
adjustment would require an increase or decrease of at least 1% in such price;
PROVIDED, HOWEVER, that any adjustments which by reason of this Section 15.5(j)
are not required to be made shall be carried forward and taken into account in
any subsequent adjustment. All calculations under this Article 15 shall be made
by the Company and shall be made to the nearest cent or to the nearest one
hundredth of a share, as the case may be. No adjustment need be made for a
change in the par value or no par value of the Common Stock.

         (k) Whenever the Conversion Price is adjusted as herein provided, the
Company shall promptly file with the Trustee and any conversion agent other than
the Trustee an Officers' Certificate setting forth the Conversion Price after
such adjustment and setting forth a brief statement of the facts requiring such
adjustment. Promptly after delivery of such certificate, the Company shall
prepare a notice of such adjustment of the Conversion Price setting forth the
adjusted Conversion Price and the date on which each adjustment becomes
effective and shall mail such notice of such adjustment of the Conversion Price
to the holder of each Note at his last address appearing on the Note register
provided for in Section 2.5, within twenty (20) days of the effective date of
such adjustment. Failure to deliver such notice shall not effect the legality or
validity of any such adjustment.

         (l) In any case in which this Section 15.5 provides that an adjustment
shall become effective immediately after a Record Date for an event, the Company
may defer until the occurrence of such event (i) issuing to the holder of any
Note converted after such Record Date and before the occurrence of such event
the additional shares of Common Stock issuable upon such conversion by reason of
the adjustment required by such event over and above the Common Stock issuable
upon such conversion before giving effect to such adjustment and (ii) paying to
such holder any amount in cash in lieu of any fraction pursuant to Section 15.3.

         (m) For purposes of this Section 15.5, the number of shares of Common
Stock at any time outstanding shall not include shares held in the treasury of
the Company but shall include shares issuable in respect of scrip certificates
issued in lieu of fractions of shares of Common Stock. The Company will not pay
any dividend or make any distribution on shares of Common Stock held in the
treasury of the Company.

         (n) In lieu of making any adjustment to the Conversion Price pursuant
to Section 15.5(e), the Company may elect to reserve an amount of cash for
distribution to the holders of the Notes upon the conversion of the Notes so
that any such holder converting Notes will receive upon such conversion, in
addition to the shares of Common Stock and other items to which such holder is
entitled, the full amount of cash which such holder would have received if such
holder had, immediately prior to the Record Date for such distribution of cash,
converted its Notes into Common Stock, together with any interest accrued with
respect to such amount, in accordance with this Section 15.5(n). The Company may
make such election by providing an


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<PAGE>

Officers' Certificate to the Trustee to such effect on or prior to the payment
date for any such distribution and depositing with the Trustee on or prior to
such date an amount of cash equal to the aggregate amount the holders of the
Notes would have received if such holders had, immediately prior to the Record
Date for such distribution, converted all of the Notes into Common Stock. Any
such funds so deposited by the Company with the Trustee shall be invested by the
Trustee in marketable obligations issued or fully guaranteed by the United
States government with a maturity not more than three (3) months from the date
of issuance. Upon conversion of Notes by a holder, the holder will be entitled
to receive, in addition to the Common Stock issuable upon conversion, an amount
of cash equal to the amount such holder would have received if such holder had,
immediately prior to the Record Date for such distribution, converted its Note
into Common Stock, along with such holder's pro rata share of any accrued
interest earned as a consequence of the investment of such funds. Promptly after
making an election pursuant to this Section 15.5(n), the Company shall give or
shall cause to be given notice to all Noteholders of such election, which notice
shall state the amount of cash per $1,000 principal amount of Notes such holders
shall be entitled to receive (excluding interest) upon conversion of the Notes
as a consequence of the Company having made such election.

         Section 15.6. EFFECT OF RECLASSIFICATION, CONSOLIDATION, MERGER OR
SALE. If any of the following events occur, namely (i) any reclassification or
change of the outstanding shares of Common Stock (other than a change in par
value, or from par value to no par value, or from no par value to par value, or
as a result of a subdivision or combination), (ii) any consolidation, merger or
combination of the Company with another corporation as a result of which holders
of Common Stock shall be entitled to receive stock, securities or other property
or assets (including cash) with respect to or in exchange for such Common Stock,
or (iii) any sale or conveyance of the properties and assets of the Company as,
or substantially as, an entirety to any other corporation as a result of which
holders of Common Stock shall be entitled to receive stock, securities or other
property or assets (including cash) with respect to or in exchange for such
Common Stock, then the Company or the successor or purchasing corporation, as
the case may be, shall execute with the Trustee a supplemental indenture (which
shall comply with the Trust Indenture Act as in force at the date of execution
of such supplemental indenture if such supplemental indenture is then required
to so comply) providing that such Note shall be convertible into the kind and
amount of shares of stock and other securities or property or assets (including
cash) receivable upon such reclassification, change, consolidation, merger,
combination, sale or conveyance by a holder of a number of shares of Common
Stock issuable upon conversion of such Notes (assuming, for such purposes, a
sufficient number of authorized shares of Common Stock available to convert all
such Notes) immediately prior to such reclassification, change, consolidation,
merger, combination, sale or conveyance assuming such holder of Common Stock did
not exercise his rights of election, if any, as to the kind or amount of
securities, cash or other property receivable upon such consolidation, merger,
statutory exchange, sale or conveyance (provided that, if the kind or amount of
securities, cash or other property receivable upon such consolidation, merger,
statutory exchange, sale or conveyance is not the same for each share of Common
Stock in respect of which such rights of election shall not have been exercised
("non-electing share"), then for the purposes of this Section 15.6 the kind and
amount of securities, cash or other property receivable upon such consolidation,


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<PAGE>

merger, statutory exchange, sale or conveyance for each non-electing share shall
be deemed to be the kind and amount so receivable per share by a plurality of
the non-electing shares). Such supplemental indenture shall provide for
adjustments which shall be as nearly equivalent as may be practicable to the
adjustments provided for in this Article. If, in the case of any such
reclassification, change, consolidation, merger, combination, sale or
conveyance, the stock or other securities and assets receivable thereupon by a
holder of shares of Common Stock include shares of stock or other securities and
assets of a corporation other than the successor or purchasing corporation, as
the case may be, in such reclassification, change, consolidation, merger,
combination, sale or conveyance, then such supplemental indenture shall also be
executed by such other corporation and shall contain such additional provisions
to protect the interests of the holders of the Notes as the Board of Directors
shall reasonably consider necessary by reason of the foregoing, including to the
extent practicable the provisions providing for the repurchase rights set forth
in Article 16 herein.

         The Company shall cause notice of the execution of such supplemental
indenture to be mailed to each holder of Notes, at his address appearing on the
Note register provided for in Section 2.5 of this Indenture, within twenty (20)
days after execution thereof. Failure to deliver such notice shall not affect
the legality or validity of such supplemental indenture.

         The above provisions of this Section shall similarly apply to
successive reclassifications, changes, consolidations, mergers, combinations,
sales and conveyances.

         If this Section 15.6 applies to any event or occurrence, Section 15.5
shall not apply.

         Section 15.7. TAXES ON SHARES ISSUED. The issue of stock certificates
on conversions of Notes shall be made without charge to the converting
Noteholder for any tax in respect of the issue thereof. The Company shall not,
however, be required to pay any tax which may be payable in respect of any
transfer involved in the issue and delivery of stock in any name other than that
of the holder of any Note converted, and the Company shall not be required to
issue or deliver any such stock certificate unless and until the person or
persons requesting the issue thereof shall have paid to the Company the amount
of such tax or shall have established to the satisfaction of the Company that
such tax has been paid.

         Section 15.8. RESERVATION OF SHARES; SHARES TO BE FULLY PAID; LISTING
OF COMMON STOCK. The Company shall provide, free from preemptive rights, out of
its authorized but unissued shares or shares held in treasury, sufficient shares
to provide for the conversion of the Notes from time to time as such Notes are
presented for conversion.

         Before taking any action which would cause an adjustment reducing the
Conversion Price below the then par value, if any, of the shares of Common Stock
issuable upon conversion of the Notes, the Company will take all corporate
action which may, in the opinion of its counsel, be necessary in order that the
Company may validly and legally issue shares of such Common Stock at such
adjusted Conversion Price.


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<PAGE>

         The Company covenants that all shares of Common Stock issued upon
conversion of Notes will be fully paid and non-assessable by the Company and
free from all taxes, liens and charges with respect to the issue thereof.

         The Company further covenants that if at any time the Common Stock
shall be listed on the Nasdaq National Market or any other national securities
exchange or automated quotation system the Company will, if permitted by the
rules of such exchange or automated quotation system, list and keep listed, so
long as the Common Stock shall be so listed on such exchange or automated
quotation system, all Common Stock issuable upon conversion of the Notes.

         Section 15.9. RESPONSIBILITY OF TRUSTEE. The Trustee and any other
conversion agent shall not at any time be under any duty or responsibility to
any holder of Notes to determine whether any facts exist which may require any
adjustment of the Conversion Price, or with respect to the nature or extent or
calculation of any such adjustment when made, or with respect to the method
employed, or herein or in any supplemental indenture provided to be employed, in
making the same. The Trustee and any other conversion agent shall not be
accountable with respect to the validity or value (or the kind or amount) of any
shares of Common Stock, or of any securities or property, which may at any time
be issued or delivered upon the conversion of any Note; and the Trustee and any
other conversion agent make no representations with respect thereto. Subject to
the provisions of Section 8.1, neither the Trustee nor any conversion agent
shall be responsible for any failure of the Company to issue, transfer or
deliver any shares of Common Stock or stock certificates or other securities or
property or cash upon the surrender of any note for the purpose of conversion or
to comply with any of the duties, responsibilities or covenants of the Company
contained in this Article. Without limiting the generality of the foregoing,
neither the Trustee nor any conversion agent shall be under any responsibility
to determine the correctness of any provisions contained in any supplemental
indenture entered into pursuant to Section 15.6 relating either to the kind or
amount of shares of stock or securities or property (including cash) receivable
by Noteholders upon the conversion of their Notes after any event referred to in
such Section 15.6 or to any adjustment to be made with respect thereto, but,
subject to the provisions of Section 8.1, may accept as conclusive evidence of
the correctness of any such provisions, and shall be protected in relying upon,
the Officers' Certificate (which the Company shall be obligated to file with the
Trustee prior to the execution of any such supplemental indenture) with respect
thereto.

         Section 15.10. NOTICE TO HOLDERS PRIOR TO CERTAIN ACTIONS.  In case:

         (a) the Company shall declare a dividend (or any other distribution) on
its Common Stock (that would require an adjustment in the Conversion Price
pursuant to Section 15.5); or

         (b) the Company shall authorize the granting to the holders of its
Common Stock of rights or warrants to subscribe for or purchase any share of any
class or any other rights or warrants; or


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<PAGE>

         (c) of any reclassification of the Common Stock of the Company (other
than a subdivision or combination of its outstanding Common Stock, or a change
in par value, or from par value to no par value, or from no par value to par
value), or of any consolidation or merger to which the Company is a party and
for which approval of any shareholders of the Company is required, or of the
sale or transfer of all or substantially all of the assets of the Company; or

         (d)      of the voluntary or involuntary dissolution, liquidation or
winding-up of the Company;

the Company shall cause to be filed with the Trustee and to be mailed to each
holder of Notes at his address appearing on the Note register, provided for in
Section 2.5 of this Indenture, as promptly as possible but in any event at least
fifteen days prior to the applicable date hereinafter specified, a notice
stating (x) the date on which a record is to be taken for the purpose of such
dividend, distribution or rights or warrants, or, if a record is not to be
taken, the date as of which the holders of Common Stock of record to be entitled
to such dividend, distribution or rights are to be determined, or (y) the date
on which such reclassification, consolidation, merger, sale, transfer,
dissolution, liquidation or winding-up is expected to become effective or occur,
and the date as of which it is expected that holders of Common Stock of record
shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reclassification, consolidation, merger, sale,
transfer, dissolution, liquidation or winding-up. Failure to give such notice,
or any defect therein, shall not affect the legality or validity of such
dividend, distribution, reclassification, consolidation, merger, sale, transfer,
dissolution, liquidation or winding-up.


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                                   ARTICLE 16.

                       REPURCHASE UPON A REPURCHASE EVENT

         Section 16.1. REPURCHASE RIGHT.

         (a) If, at any time prior to March 15, 2005 there shall occur a
Repurchase Event, then each Noteholder shall have the right, at such holder's
option, to require the Company to repurchase all of such holder's Notes, or
any portion thereof (in principal amounts of $1,000 or integral multiples
thereof), on the date (the "repurchase date") that is forty (40) calendar
days after the date of the Company Notice (as defined in Section 16.2 below)
of such Repurchase Event (or, if such 40th day is not a Business Day, the
next succeeding Business Day). Such repurchase shall be made in cash at a
price equal to 105% of the principal amount of Notes such holder elects to
require the Company to repurchase, together with accrued interest, if any, to
the repurchase date (the "Repurchase Price") (or, at the option of the
Company, by delivery of Common Stock in accordance with the provisions of
Section 16.3); PROVIDED, HOWEVER, that if such repurchase date is March 15 or
September 15 then the interest payable on such date shall be paid to the
holder of record of the Note on the next preceding March 1 or September 1,
respectively. No Notes may be redeemed at the option of holders upon a
Repurchase Event if there has occurred and is continuing an Event of Default,
other than a default in the payment of the Repurchase Price with respect to
such Notes on the repurchase date.

         Section 16.2. NOTICES; METHOD OF EXERCISING REPURCHASE RIGHT, ETC.

         (a) Unless the Company shall have theretofore called for redemption all
of the outstanding Notes, on or before the fifteenth (15th) calendar day after
the occurrence of a Repurchase Event, the Company or, at the written request of
the Company, the Trustee, shall mail to all holders of record of the Notes a
notice (the "Company Notice") in the form as prepared by the Company of the
occurrence of the Repurchase Event and of the repurchase right set forth herein
arising as a result thereof. The Company shall also deliver a copy of such
notice of a repurchase right to the Trustee and cause a copy of such notice of a
repurchase right, or a summary of the information contained therein, to be
published once in a newspaper of general circulation in The City of New York.
The Company Notice shall contain the following information:

                  (1) the repurchase date,

                  (2) the date by which the repurchase right must be exercised,

                  (3) the last date by which the election to require repurchase,
                      if submitted, must be revoked;


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<PAGE>

                  (4) the Repurchase Price and whether the Repurchase Price
                      shall be payable in cash or Common Stock and, if
                      payable in Common Stock, the method of calculating
                      the amount of the Common Stock to be delivered upon
                      the repurchase as provided in Section 16.3(a);

                  (5) a description of the procedure which a holder must follow
                      to exercise a repurchase right, and

                  (6) the Conversion Price then in effect, the date on
                      which the right to convert the principal amount of
                      the Notes to be repurchased will terminate and the
                      place or places where Notes may be surrendered for
                      conversion.

                  No failure of the Company to give the foregoing notices or
         defect therein shall limit any holder's right to exercise a repurchase
         right or affect the validity of the proceedings for the repurchase of
         Notes.

                  If any of the foregoing provisions are inconsistent with
applicable law, such law shall govern.

         (b) To exercise a repurchase right, a holder shall deliver to the
Trustee on or before the thirty-fifth (35th) day after the Company Notice was
delivered (i) written notice to the Company (or agent designated by the Company
for such purpose) of the holder's exercise of such right, which notice shall set
forth the name of the holder, the principal amount of the Notes to be
repurchased, a statement that an election to exercise the repurchase right is
being made thereby, and, in the event that the Repurchase Price shall be paid in
shares of Common Stock, the name or names (with addresses) in which the
certificate or certificates for shares of Common Stock shall be issued, and (ii)
the Notes with respect to which the repurchase right is being exercised, duly
endorsed for transfer to the Company. Election of repurchase by a holder shall
be revocable at any time prior to, but excluding, the repurchase date, by
delivering written notice to that effect to the Trustee prior to the close of
business on the Business Day prior to the repurchase date.

         (c) If the Company fails to repurchase on the repurchase date any Notes
(or portions thereof) as to which the repurchase right has been properly
exercised, then the principal of such Notes shall, until paid, bear interest to
the extent permitted by applicable law from the repurchase date at the rate
borne by the Note and each such Note shall be convertible into Common Stock in
accordance with this Indenture (without giving effect to Section 16.2(b)) until
the principal of such Note shall have been paid or duly provided for.

         (d) Any Note which is to be repurchased only in part shall be
surrendered to the Trustee duly endorsed for transfer to the Company and
accompanied by appropriate evidence of genuineness and authority satisfactory to
the Company and the Trustee duly executed by, the holder thereof (or his
attorney duly authorized in writing), and the Company shall execute, and the
Trustee shall authenticate and deliver to the holder of such Note without
service charge, a new Note or Notes, containing identical terms and conditions,
of any authorized denomination as


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<PAGE>

requested by such holder in aggregate principal amount equal to and in exchange
for the unrepurchased portion of the principal of the Note so surrendered.

         (e) On or prior to the repurchase date, the Company shall deposit with
the Trustee or with a paying agent (or, if the Company is acting as its own
paying agent, segregate and hold in trust as provided in Section 5.4) the
Repurchase Price in cash for payment to the holder on the repurchase date;
PROVIDED that if payment is to be made in cash, such cash payment is made on the
repurchase date it must be received by the Trustee or paying agent, as the case
may be, by 10:00 a.m., New York City time, on such date; PROVIDED FURTHER that
if the Repurchase Price is to be paid in shares of Common Stock, such shares of
Common Stock are to be paid as promptly after the repurchase date as
practicable.

         (f) Any issuance of shares of Common Stock in respect of the Repurchase
Price shall be deemed to have been effected immediately prior to the close of
business on the repurchase date and the person or persons in whose name or names
any certificate or certificates for shares of Common Stock shall be issuable
upon such repurchase shall be deemed to have become on the repurchase date the
holder or holders of record of the shares represented thereby; provided,
however, that any surrender for repurchase on a date when the stock transfer
books of the Company shall be closed shall constitute the person or persons in
whose name or names the certificate or certificates for such shares are to be
issued as the record holder or holders thereof for all purposes at the opening
of business on the next succeeding day on which such stock transfer books are
open. No payment or adjustment shall be made for dividends or distributions on
any Common Stock issued upon repurchase of any Security declared prior to the
repurchase date.

         (g) No fractions of shares shall be issued upon repurchase of Notes. If
more than one Note shall be repurchased from the same holder and the Repurchase
Price shall be payable in shares of Common Stock, the number of full shares
which shall be issuable upon such repurchase shall be computed on the basis of
the aggregate principal amount of the Notes so repurchased. Instead of any
fractional share of Common Stock which would otherwise be issuable on the
repurchase of any Note or Notes, the Company will deliver to the applicable
holder its check for the current market value of such fractional share. The
current market value of a fraction of a share is determined by multiplying the
current market price of a full share by the fraction, and rounding the result to
the nearest cent. For purposes of this Section, the current market price of a
share of Common Stock is the Closing Price of the Common Stock on the Trading
Day immediately preceding the repurchase date.

         (h) Any issuance and delivery of certificates for shares of Common
Stock on repurchase of Notes shall be made without charge to the holder of Notes
being repurchased for such certificates or for any tax or duty in respect of the
issuance or delivery of such certificates or the securities represented thereby;
provided, however, that the Company shall not be required to pay any tax or duty
which may be payable in respect of (i) income of the holder or (ii) any transfer
involved in the issuance or delivery of certificates for shares of Common Stock
in a name other than that of the holder of the Notes being repurchased, and no
such issuance or


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<PAGE>

delivery shall be made unless and until the person requesting such issuance or
delivery has paid to the Company the amount of any such tax or duty or has
established, to the satisfaction of the Company, that such tax or duty has been
paid.

         (i) All Notes delivered for repurchase shall be delivered to the
Trustee to be canceled in accordance with the provisions of Section 2.8.

         Section 16.3. CONDITIONS TO THE COMPANY'S ELECTION TO PAY THE
REPURCHASE PRICE IN COMMON STOCK.

         The Company may elect to pay the Repurchase Price by delivery of shares
of Common Stock pursuant to Section 16.1 if and only if the following conditions
shall have been satisfied:

         (a) The shares of Common Stock deliverable in payment of the Repurchase
Price shall have a fair market value as of the repurchase date of not less than
the Repurchase Price. For purposes of Section 16.1 and this Section 16.3, the
fair market value of shares of Common Stock shall be determined by the Company
and shall be equal to 95% of the average of the Closing Prices of the Common
Stock for the five consecutive Trading Days immediately preceding and including
the third Trading Day prior to the repurchase date;

         (b) The Repurchase Price shall be paid only in cash in the event any
shares of Common Stock to be issued upon repurchase of Notes hereunder (i)
require registration under any federal securities law before such shares may be
freely transferable without being subject to any transfer restrictions under the
Securities Act upon repurchase and if such registration is not completed or does
not become effective prior to the repurchase date, and/or (ii) require
registration with or approval of any governmental authority under any state law
or any other federal law before such shares may be validly issued or delivered
upon repurchase and if such registration is not completed or does not become
effective or such approval is not obtained prior to the repurchase date;

         (c) Payment of the Repurchase Price may not be made in Common Stock
unless such stock is, or shall have been, or approved for quotation on the
Nasdaq National Market or listed on a national securities exchange, in either
case, prior to the repurchase date; and

         (d) All shares of Common Stock which may be issued upon repurchase of
the Notes will be issued out of the Company's authorized but unissued Common
Stock and, will upon issue, be duly and validly issued and fully paid and
non-assessable and free of any preemptive rights.

         If all of the conditions set forth in this Section 16.3 are not
satisfied in accordance with the terms thereof, the Repurchase Price shall be
paid by the Company only in cash.

         Section 16.4. CERTAIN DEFINITIONS.  For purposes of this Article 16:


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<PAGE>

         (a) the term "beneficial owner" shall be determined in accordance with
Rule 13d-3 and 13d-5, as in effect on the date of the original execution of this
Indenture, promulgated by the Securities and Exchange Commission pursuant to the
Exchange Act;

         (b) the term "person" or "group" shall include any syndicate or group
which would be deemed to be a "person" under Section 13(d) and 14(d) of the
Exchange Act as in effect on the date of the original execution of this
Indenture; and

         (c) the term "Continuing Director" means at any date a member of the
Company's Board of Directors (i) who was a member of such board on December 31,
1999 or (ii) who was nominated or elected by at least a majority of the
directors who were Continuing Directors at the time of such nomination or
election or whose election to the Company's Board of Directors was recommended
or endorsed by at least a majority of the directors who were Continuing
Directors at the time of such nomination or election or such lesser number
comprising a majority of a nominating committee if authority for such
nominations or elections has been delegated to a nominating committee whose
authority and composition have been approved by at least a majority of the
directors who were continuing directors at the time such committee was formed.
(Under this definition, if the Board of Directors of the Company as of the date
of this Indenture were to approve a new director or directors and then resign,
no Change in Control would occur even though the current Board of Directors
would thereafter cease to be in office).

         (d) the term "Repurchase Event" means a Change in Control or a
Termination of Trading.

         (e) a "Change in Control" shall be deemed to have occurred when (i) any
"person" or "group" (as such terms are used in Sections 13(d) and 14(d) of the
Exchange Act) is or becomes the "beneficial owner" (as defined in Rules 13-d3
and 13-d5 under the Exchange Act) of shares representing more than 50% of the
combined voting power of the then outstanding securities entitled to vote
generally in elections of directors of the Company (the "Voting Stock"); (ii)
approval by stockholders of the Company of any plan or proposal for the
liquidation, dissolution or winding up of the Company; (iii) the Company (A)
consolidates with or merges into any other corporation or any other corporation
merges into the Company, and in the case of any such transaction, the
outstanding Common Stock of the Company is changed or exchanged into other
assets or securities as a result, unless the stockholders of the Company
immediately before such transaction own, directly or indirectly immediately
following such transaction, at least 51% of the combined voting power of the
outstanding voting securities of the corporation resulting from such transaction
in substantially the same proportion as their ownership of the Voting Stock
immediately before such transaction, or (B) conveys, transfers or leases all or
substantially all of its assets to any person; or (iv) any time Continuing
Directors do not constitute a majority of the Board of Directors of the Company
(or, if applicable, a successor corporation to the Company); PROVIDED that a
Change in Control shall not be deemed to have occurred if either (x) the Closing
Price (as defined in Section 15.5(h)(1) hereof) of the Common Stock for any five
(5) Trading Days during the ten (10) Trading Days immediately preceding the
Change in Control is at least equal to 105% of the Conversion Price in effect on
the date on


                                       77
<PAGE>

which the Change in Control occurs or (y) in the case of a merger or
consolidation otherwise constituting a Change in Control, all of the
consideration (excluding cash payments for fractional shares) in such merger or
consolidation constituting the Change in Control consists of common stock traded
on a United States national securities exchange or quoted on the Nasdaq National
Market (or which will be so traded or quoted when issued or exchanged in
connection with such Change in Control) and as a result of such transaction or
transactions such Notes become convertible solely into such common stock.

         (f) a "Termination of Trading" shall have occurred if the Common Stock
(or other common stock into which the Notes are then convertible) is neither
listed for trading on a United States national securities exchange nor approved
for trading on an established automated over-the-counter trading market in the
United States.

                                   ARTICLE 17.

                            MISCELLANEOUS PROVISIONS

         Section 17.1. PROVISIONS BINDING ON COMPANY'S SUCCESSORS. All the
covenants, stipulations, promises and agreements of the Company in this
Indenture contained shall bind its successors and assigns whether so expressed
or not.

         Section 17.2. OFFICIAL ACTS BY SUCCESSOR CORPORATION. Any act or
proceeding by any provision of this Indenture authorized or required to be done
or performed by any board, committee or officer of the Company shall and may be
done and performed with like force and effect by the like board, committee or
officer of any corporation that shall at the time be the lawful sole successor
of the Company.

         Section 17.3. ADDRESSES FOR NOTICES, ETC. Any notice or demand which
by any provision of this Indenture is required or permitted to be given or
served by the Trustee or by the holders of Notes on the Company shall be deemed
to have been sufficiently given or made, for all purposes if given or served by
being deposited postage prepaid by registered or certified mail in a post office
letter box addressed (until another address is filed by the Company with the
Trustee) to 20 Second Avenue, Burlington, Massachusetts 01803, Attention: Chief
Financial Officer. Any notice, direction, request or demand hereunder to or upon
the Trustee shall be deemed to have been sufficiently given or made, for all
purposes, if given or served by being deposited postage prepaid by registered or
certified mail in a post office letter box addressed to the Corporate Trust
Office.

         The Trustee, by notice to the Company, may designate additional or
different addresses for subsequent notices or communications.


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<PAGE>

         Any notice or communication mailed to a Noteholder shall be mailed to
him by first class mail, postage prepaid, at his address as it appears on the
Note register and shall be sufficiently given to him if so mailed within the
time prescribed.

         Failure to mail a notice or communication to a Noteholder or any defect
in it shall not affect its sufficiency with respect to other Noteholders. If a
notice or communication is mailed in the manner provided above, it is duly
given, whether or not the addressee receives it.

         Section 17.4. GOVERNING LAW. This Indenture and each Note shall be
deemed to be a contract made under the laws of New York, and for all purposes
shall be construed in accordance with the laws of New York (without regard to
the conflict of laws provisions thereof).

         Section 17.5. EVIDENCE OF COMPLIANCE WITH CONDITIONS PRECEDENT;
CERTIFICATES TO TRUSTEE. Upon any application or demand by the Company to the
Trustee to take any action under any of the provisions of this Indenture, the
Company shall furnish to the Trustee an Officers' Certificate stating that all
conditions precedent, if any, provided for in this Indenture relating to the
proposed action have been complied with, and an Opinion of Counsel stating that,
in the opinion of such counsel, all such conditions precedent have been complied
with.

         Each certificate or opinion provided for by or on behalf of the Company
in this Indenture and delivered to the Trustee with respect to compliance with a
condition or covenant provided for in this Indenture shall include (1) a
statement that the person making such certificate or opinion has read such
covenant or condition; (2) a brief statement as to the nature and scope of the
examination or investigation upon which the statement or opinion contained in
such certificate or opinion is based; (3) a statement that, in the opinion of
such person, he has made such examination or investigation as is necessary to
enable him to express an informed opinion as to whether or not such covenant or
condition has been complied with; and (4) a statement as to whether or not, in
the opinion of such person, such condition or covenant has been complied with.

         Section 17.6. LEGAL HOLIDAYS. In any case where the date of maturity
of interest on or principal of the Notes or the date fixed for redemption of any
Note will not be a Business Day, then payment of such interest on or principal
of the Notes need not be made on such date, but may be made on the next
succeeding Business Day with the same force and effect as if made on the date of
maturity or the date fixed for redemption, and no interest shall accrue for the
period from and after such date.

         Section 17.7. NO SECURITY INTEREST CREATED. Nothing in this Indenture
or in the Notes, expressed or implied, shall be construed to constitute a
security interest under the Uniform Commercial Code or similar legislation, as
now or hereafter enacted and in effect, in any jurisdiction.

         Section 17.8. TRUST INDENTURE ACT. This Indenture is hereby made
subject to, and shall be governed by, the provisions of the Trust Indenture Act
required to be part of and to govern


                                       79
<PAGE>

indentures qualified under the Trust Indenture Act. If any provision hereof
limits, qualifies or conflicts with another provision hereof which is required
to be included in an indenture qualified under the Trust Indenture Act, such
required provision shall control.

         Section 17.9. BENEFITS OF INDENTURE. Nothing in this Indenture or in
the Notes, expressed or implied, shall give to any person, other than the
parties hereto, any paying agent, any authenticating agent, any Note registrar
and their successors hereunder, the holders of Notes and the holders of Senior
Indebtedness, any benefit or any legal or equitable right, remedy or claim under
this Indenture.

         Section 17.10. TABLE OF CONTENTS, HEADINGS, ETC. The table of contents
and the titles and headings of the articles and sections of this Indenture have
been inserted for convenience of reference only, are not to be considered a part
hereof, and shall in no way modify or restrict any of the terms or provisions
hereof.

         Section 17.11. AUTHENTICATING AGENT. The Trustee may appoint an
authenticating agent which shall be authorized to act on its behalf and subject
to its direction in the authentication and delivery of Notes in connection with
the original issuance thereof and transfers and exchanges of Notes hereunder,
including under Sections 2.4, 2.5, 2.6, 2.7 and 3.3, as fully to all intents and
purposes as though the authenticating agent had been expressly authorized by
this Indenture and those Sections to authenticate and deliver Notes. For all
purposes of this Indenture, the authentication and delivery of Notes by the
authenticating agent shall be deemed to be authentication and delivery of such
Notes "by the Trustee" and a certificate of authentication executed on behalf of
the Trustee by an authenticating agent shall be deemed to satisfy any
requirement hereunder or in the Notes for the Trustee's certificate of
authentication. Such authenticating agent shall at all times be a person
eligible to serve as trustee hereunder pursuant to Section 8.9.

         Any corporation into which any authenticating agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, consolidation or conversion to which any authenticating agent
shall be a party, or any corporation succeeding to the corporate trust business
of any authenticating agent, shall be the successor of the authenticating agent
hereunder, if such successor corporation is otherwise eligible under this
Section, without the execution or filing of any paper or any further act on the
part of the parties hereto or the authenticating agent or such successor
corporation.

         Any authenticating agent may at any time resign by giving written
notice of resignation to the Trustee and to the Company. The Trustee may at any
time terminate the agency of any authenticating agent by giving written notice
of termination to such authenticating agent and to the Company. Upon receiving
such a notice of resignation or upon such a termination, or in case at any time
any authenticating agent shall cease to be eligible under this Section, the
Trustee shall promptly appoint a successor authenticating agent (which may be
the Trustee), shall give written notice of such appointment to the Company and
shall mail notice of such appointment to all holders of Notes as the names and
addresses of such holders appear on the Note register.


                                       80
<PAGE>

         The Trustee agrees to pay to the authenticating agent from time to time
reasonable compensation for its services (to the extent pre-approved by the
Company in writing), and the Trustee shall be entitled to be reimbursed for such
pre-approved payments, subject to Section 8.6.

         The provisions of Sections 8.2, 8.3, 8.4, 9.3 and this Section 17.11
shall be applicable to any authenticating agent.

         Section 17.12. EXECUTION IN COUNTERPARTS. This Indenture may be
executed in any number of counterparts, each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

         [The Bank of New York] hereby accepts the trusts in this Indenture
declared and provided, upon the terms and conditions hereinabove set forth.

                                       81
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed as of the date first written above.

                                  IBASIS, INC.

                                  By:       /s/ Gordon J. VanderBrug
                                            ----------------------------
                                      Name:     Gordon J. VanderBrug
                                            ----------------------------
                                      Title:    Executive Vice President
                                            ----------------------------

Attest:


/s/ Erin C. Hartigan
- ------------------------------
Name:  Erin C. Hartigan
       -----------------------
Title: Executive Assistant
       -----------------------
          [Corporate Seal]

                                  THE BANK OF NEW YORK,
                                  as Trustee

                                  By: /s/ Michael Culhane
                                      --------------------------------
                                      Name:  Michael Culhane
                                             -------------------------
                                      Title: Vice President
                                             -------------------------


                                       82
<PAGE>

                                    EXHIBIT A

                                  FORM OF NOTE

[THE FOLLOWING LEGEND SHALL APPEAR ON THE FACE OF EACH GLOBAL NOTE:

         THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A
NOMINEE OF THE DEPOSITARY, WHICH MAY BE TREATED BY THE COMPANY, THE TRUSTEE AND
ANY AGENT THEREOF AS OWNER AND HOLDER OF THIS NOTE FOR ALL PURPOSES.

         UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE COMPANY OR
ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

         UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN
DEFINITIVE REGISTERED FORM IN THE LIMITED CIRCUMSTANCES REFERRED TO IN THE
INDENTURE, THIS GLOBAL SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE
DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO
THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY
SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR
DEPOSITARY.]


                                      A-1
<PAGE>

                                  IBASIS, INC.

                       ____% CONVERTIBLE SUBORDINATED NOTE
                                    DUE 2005

No. ________________                               U.S.$___________________

CUSIP NO. ______________

         IBASIS, INC., a corporation duly organized and existing under the laws
of the State of Delaware (herein called the "Company", which term includes any
successor person under the Indenture referred to on the reverse hereof), for
value received, hereby promises to pay to ________________________, the
principal sum of ________ United States Dollars (U.S.$______ ) (which principal
amount may from time to time be increased or decreased to such other principal
amounts (which, taken together with the principal amounts of all other
outstanding Notes under the Indenture, shall not exceed U.S.$172,500,000 in the
aggregate at any time) by adjustments made on the records of the Trustee
hereinafter referred to in accordance with the Indenture) on _____________, 2005
and to pay interest thereon, from _______________, 2000, or from the most recent
Interest Payment Date (as defined below) to which interest has been paid or duly
provided for, semi-annually in arrears on ________ and __________ in each year
(each, an "Interest Payment Date"), commencing ___________, 2000, at the rate of
____% per annum, until the principal hereof is due, and at the rate of ___% per
annum on any overdue principal and premium, if any, and, to the extent permitted
by law, on any overdue interest. The interest so payable, and punctually paid or
duly provided for, on any Interest Payment Date will, as provided in the
Indenture, be paid to the Person in whose name this Note (or one or more
Predecessor Notes) is registered at the close of business on the record date
with respect to any interest payment date, which shall be the __________ or
_________ (whether or not a Business Day), as the case may be, next preceding
such interest payment date. Except as otherwise provided in the Indenture, any
such interest not so punctually paid or duly provided for ("Defaulted Interest)
will forthwith cease to be payable to the Noteholder on the relevant record date
by virtue of his having been such Noteholder and may either be paid to the
Person in whose name this Note (or one or more Predecessor Note) is registered
at the close of business on a special record date for the payment of such
Defaulted Interest to be fixed in accordance with the Indenture or be paid at
any time in any other lawful manner not inconsistent with the requirements of
any automated quotation system or securities exchange on which the Notes may be
quoted or listed, and upon such notice as may be required by such exchange, all
as more fully provided in the Indenture. Payments of principal shall be made
upon the surrender of this Note at the Corporate Trust Office of the Trustee, or
at such other office or agency of the Company as may be designated by the
Company for such purpose in the Borough of Manhattan, The City of New York, in
such coin or currency of the United States of America as at the time of payment
shall be legal tender for the payment of public and private debts, by United
States Dollar check drawn on, or transfer to, a United States Dollar account.
Payments of interest on this Note may be made by United States Dollar check,
drawn on a United States Dollar Account, mailed to the address of the Person
entitled thereto as such address shall appear in the Note


                                      A-2
<PAGE>

Registry, or, upon written application by the Noteholder to the Trustee setting
forth wire instructions not later than two days prior to the applicable record
date, by transfer to a United States Dollar account; provided, however, that
transfers to United States Dollar accounts will be made only to Noteholders of
an aggregate principal amount of Notes in excess of $2,000,000; provided,
further that any payment to the Depositary or its nominee shall be made by wire
transfer of immediately available funds to the account of the Depositary or its
nominee.

         Except as specifically provided herein and in the Indenture, the
Company shall not be required to make any payment with respect to any tax,
assessment or other governmental charge imposed by any government or any
political subdivision or taxing authority thereof or therein.

         Reference is hereby made to the further provisions of this Note set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

         Unless the certificate of authentication hereon has been executed by
the Trustee referred to on the reverse hereof or an authenticating agent by the
manual signature of one of their respective authorized signatories, this Note
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.


                                      A-3
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Note to be duly
executed and delivered under its corporate seal.

                                  IBASIS, INC.

[Corporate Seal]

                                  By: _____________________________________
                                      Name: _______________________________
                                      Title: ______________________________


                                  By: _____________________________________
                                      Name: _______________________________
                                      Title: ______________________________

Attest:


__________________________
Name:
Title:

                    (Trustee's Certificate of Authentication)

        This is one of the _____% Convertible Subordinated Notes due 2005
referred to in the within-mentioned Indenture.

                                  [THE BANK OF NEW YORK], as Trustee

                                  By: ____________________________________
                                         Authorized Signatory


                                      A-4
<PAGE>

                                [FORM OF REVERSE]

         This Note is one of a duly authorized issue of securities of the
Company designated as its "___% Convertible Subordinated Notes due 2005" (herein
called the "Notes"), limited in aggregate principal amount to U.S. $172,500,000,
issued and to be issued under an Indenture, dated as of ____________, 2000
(herein called the "Indenture"), between the Company and [The Bank of New York],
as Trustee (herein called the "Trustee", which term includes any successor
trustee under the Indenture) to which Indenture and all indentures supplemental
thereto reference is hereby made for a statement of the respective rights,
limitations of rights, duties and immunities thereunder of the Company, the
Trustee, the holders of senior indebtedness and the holders of the Notes and of
the terms upon which the Notes are, and are to be, authenticated and delivered.
As provided in the Indenture and subject to certain limitations therein set
forth, Notes are exchangeable for a like aggregate principal amount of Notes of
any authorized denominations as requested by the holder surrendering the same
upon surrender of the Note or Notes to be exchanged, initially, at the Corporate
Trust Office of the Trustee. The Trustee upon such surrender by the holder will
issue the new Notes in the requested denominations.

         No sinking fund is provided for the Notes.

         The Notes are subject to Provisional Redemption by the Company, in
whole or in part, at any time prior to _____________, 2003, upon notice as set
forth in Section 3.2 of the Indenture, at a redemption price equal to $1,000 per
Note to be redeemed plus accrued and unpaid interest, if any, to the Provisional
Redemption Date if (i) the closing price of the Common Stock shall have exceeded
150% of the Conversion Price then in effect for at least 20 Trading Days in any
consecutive 30-Trading Day period ending on the Trading Day prior to the Notice
Date. Upon any such Provisional Redemption, the Company shall make a Make-Whole
Payment with respect to the Notes called for redemption to holders on the Notice
Date in an amount equal to $_____ per $1,000 Note, less the amount of any
interest actually paid on such Note prior to the Notice Date. The Company shall
make the Make-Whole Payment on all Notes called for Provisional Redemption,
including any Notes converted into Common Stock pursuant to the terms of the
Indenture after the Notice Date and prior to the Provisional Redemption Date.

         The Notes are also subject to redemption at the option of the Company
at any time on or after ____________, 2003, in whole or in part, upon not less
than 20 nor more than 60 days' notice to the holders prior to the date fixed for
redemption at the following optional redemption prices (expressed as percentages
of the principal amount) for the twelve-month period beginning on _______ of the
following years:

               YEAR                      REDEMPTION PRICE

               2003                        ________%

               2004                        ________%


                                      A-5
<PAGE>

and on ________, 2005 and thereafter at an optional redemption price equal to
100% of the principal amount, together, in each case, with accrued and unpaid
interest to (but excluding) the date fixed for redemption; provided, however,
that interest installments on Notes will be payable to the holders of such
Notes, or one or more Predecessor Notes, of record at the close of business on
the relevant record dates referred to on the face hereof, all as provided in the
Indenture.

         None of the Company, the Trustee, the Note registrar or any
co-registrar shall be required to exchange or register a transfer of (a) any
Notes for a period of fifteen (15) days next preceding any selection of Notes to
be redeemed or (b) any Notes called for redemption or, if a portion of any Note
is selected or called for redemption, such portion thereof selected or called
for redemption or (c) any Notes surrendered for conversion or, if a portion of
any Note is surrendered for conversion, such portion thereof surrendered for
conversion or (d) any Notes, or a portion of any Note, surrendered for
repurchase (and not withdrawn) in connection with a Repurchase Event.

         In any case where the due date for the payment of the principal of,
premium, if any, or interest on any Note or the last day on which a holder of a
Note has a right to convert his Note shall not be a Business Day, then payment
of principal, premium, if any, interest or delivery for conversion of such Note
need not be made on or by such date at such place but may be made on or by the
next succeeding Business Day, with the same force and effect as if made on the
date for such payment or the date fixed for redemption or repurchase, or by such
last day for conversion, and no interest shall accrue on the amount so payable
for the period after such date.

         Subject to and upon compliance with the provisions of the Indenture,
the holder of this Note is entitled, at his option, at any time following the
original issue date of the Notes and on or before the close of business on the
Business Day immediately preceding ____________, 2005, or in case this Note or a
portion hereof is called for redemption or the holder hereof has exercised his
right to require the Company to repurchase this Note or such portion hereof,
then in respect of this Note until but (unless the Company defaults in making
the payment due upon redemption or repurchase, as the case may be) not after,
the close of business on Business Day immediately preceding the any optional
redemption date or Provisional Redemption Date or the date fixed for repurchase,
as the case may be, to convert this Note (or any portion of the principal amount
hereof that is an integral multiple of U.S.$1,000, provided that the unconverted
portion of such principal amount is U.S.$1,000 or any integral multiple of
U.S.$1,000 in excess thereof) into fully paid and nonassessable shares of Common
Stock of the Company at an initial Conversion Rate of _______ shares of Common
Stock for each $1,000 principal amount of Notes (or at the current adjusted
Conversion Rate if an adjustment has been made as provided in the Indenture,
including pursuant to Section 15.5 of the Indenture) by surrender of this Note,
duly endorsed and, in case such surrender shall be made during the period from
the close of business on any record date next preceding any interest payment
date to the opening of business on such Interest Payment Date (except if this
Note or portion thereof has been called for redemption on a Provisional
Redemption Date or optional redemption date or is repurchasable on a date fixed
for repurchase), also accompanied by payment in New York Clearing House or other
funds


                                      A-6
<PAGE>

acceptable to the Company of an amount equal to the interest payable on such
interest payment date on the principal amount of this Note then being converted,
and also the conversion notice hereon duly executed, to the Company at the
Corporate Trust Office of the Trustee, or at such other office or agency of the
Company, subject to any laws or regulations applicable thereto and subject to
the right of the Company to terminate the appointment of any Conversion Agent
(as defined below) as may be designated by it for such purpose in the Borough of
Manhattan, The City of New York, or at such other offices or agencies as the
Company may designate (each a "Conversion Agent"), provided, however, that if
this Note or portion hereof has been called for redemption on a Provisional
Redemption Date or optional redemption date or is repurchasable on a repurchase
rate, then the holder of this Note on such record date will be entitled to
receive the interest accruing hereon from the interest payment date next
preceding the date of such conversion to such succeeding interest payment date
and the holder of this Note who converts this Note or a portion hereof during
such period shall not be required to pay such interest upon surrender of this
Note for conversion. Subject to the provisions of the preceding sentence, no
cash payment or adjustment is to be made on conversion for interest accrued
hereon from the interest payment date next preceding the day of conversion, or
for dividends on the Common Stock issued on conversion hereof. The Company shall
thereafter deliver to the holder the fixed number of shares of Common Stock
(together with any cash adjustment, as provided in the Indenture) into which
this Note is convertible and such delivery will be deemed to satisfy the
Company's obligation to pay the principal amount of this Note. No fractions of
shares or scrip representing fractions of shares will be issued on conversion,
but instead of any fractional interest (calculated to the nearest 1/100th of a
share) the Company shall pay a cash adjustment as provided in the Indenture. The
Conversion Rate is subject to adjustment as provided in the Indenture. In
addition, the Indenture provides that in case of certain consolidations or
mergers to which the Company is a party (other than a consolidation or merger
that does not result in any reclassification, conversion, exchange or
cancellation of the Common Stock) or the conveyance, transfer, sale or lease of
all or substantially all of the property and assets of the Company, the
Indenture shall be amended, without the consent of any holders of Notes, so that
this Note, if then outstanding, will be convertible thereafter, during the
period this Note shall be convertible as specified above, only into the kind and
amount of securities, cash and other property receivable upon such
consolidation, merger, conveyance, transfer, sale or lease by a holder of the
number of shares of Common Stock of the Company into which this Note could have
been converted immediately prior to such consolidation, merger, conveyance,
transfer, sale or lease (subject to the provisions of, and as more explicitly
set forth in, the Indenture). No adjustment in the Conversion Rate will be made
until such adjustment would require an increase or decrease of at least one
percent of such price, provided that any adjustment that would otherwise be made
will be carried forward and taken into account in the computation of any
subsequent adjustment. At any time of determination, the term "Conversion Price"
shall mean an amount equal U.S.$1,000 divided by the Conversion Rate (rounded to
the nearest cent)

         If a Repurchase Event occurs, the holder of this Note, at the holder's
option, shall have the right, in accordance with the provisions of the
Indenture, to require the Company to repurchase this Note (or any portion of the
principal amount hereof that is at least $1,000 or an


                                      A-7
<PAGE>

integral multiple) for cash at a price equal to 105% of the principal amount
thereof plus interest accrued to the repurchase date. At the option of the
Company, the Repurchase Price may be paid in cash or, subject to the conditions
provided in the Indenture, by delivery of shares of Common Stock having a fair
market value equal to the Repurchase Price. For purposes of this paragraph, the
fair market value of shares of Common Stock shall be determined by the Company
and shall be equal to 95% of the average of the Closing Prices Per Share for the
five consecutive Trading Days immediately preceding and including the third
Trading Day prior to the repurchase date. Whenever in this Note there is a
reference, in any context, to the principal of any Note as of any time, such
reference shall be deemed to include reference to the Repurchase Price payable
in respect of such Note to the extent that such Repurchase Price is, was or
would be so payable at such time, and express mention of the Repurchase Price in
any provision of this Note shall not be construed as excluding the Repurchase
Price so payable in those provisions of this Note when such express mention is
not made; provided, however, that, for the purposes of the second succeeding
paragraph, such reference shall be deemed to include reference to the Repurchase
Price only to the extent the Repurchase Price is payable in cash.

         [The following paragraph shall appear in each Global Security:

         In the event of a deposit or withdrawal of an interest in this Note,
including an exchange, transfer, redemption, repurchase or conversion of this
Note in part only, the Trustee, as custodian of the Depositary, shall make an
adjustment on its records to reflect such deposit or withdrawal in accordance
with the rules and procedures of The Depository Trust Company applicable to, and
as in effect at the time of, such transaction.]

         [The following paragraph shall appear in each Note that is not a Global
Security:

         In the event of redemption, repurchase or conversion of this Note in
part only, a new Note or Notes for the unredeemed, unrepurchased or unconverted
portion hereof will be issued in the name of the holder hereof.]

         The indebtedness evidenced by this Note is, to the extent and in the
manner provided in the Indenture, subordinate and subject in right of payment to
the prior payment in full in cash of all senior indebtedness of the Company, and
this Note is issued subject to such provisions of the Indenture with respect
thereto. Each holder of this Note, by accepting the same, (a) agrees to and
shall be bound by such provisions, (b) authorizes and directs the Trustee on his
behalf to take such action as may be necessary or appropriate to effectuate the
subordination so provided and (c) appoints the Trustee his attorney-in-fact for
any and all such purposes.

         If an Event of Default shall occur and be continuing, the principal of
all the Notes, together with accrued interest to the date of declaration, may be
declared due and payable in the manner and with the effect provided in the
Indenture. Upon payment (i) of the amount of principal so declared due and
payable, together with accrued interest to the date of declaration, and (ii) of
interest on any overdue principal and, to the extent permitted by applicable
law,


                                      A-8
<PAGE>

overdue interest, all of the Company's obligations in respect of the payment of
the principal of and interest on the Notes shall terminate.

         The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the holders of the Notes under the Indenture at any
time by the Company and the Trustee with either (a) the written consent of the
holders of not less than a majority in principal amount of the Notes at the time
outstanding, or (b) by the adoption of a resolution, at a meeting of holders of
the Outstanding Notes at which a quorum is present, by the holders of at least
66-2/3% in aggregate principal amount of the Outstanding Notes represented and
entitled to vote at such meeting. The Indenture also contains provisions
permitting the holders of specified percentages in principal amount of the Notes
at the time outstanding, on behalf of the holders of all the Notes, to waive
compliance by the Company with certain provisions of the Indenture and certain
past defaults under the Indenture and their consequences. Any such consent or
waiver by the holder of this Note shall be conclusive and binding upon such
holder and upon all future holders of this Note and of any Note issued in
exchange herefor or in lieu hereof whether or not notation of such consent or
waiver is made upon this Note or such other Note.

         As provided in and subject to the provisions of the Indenture, the
holder of this Note shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder, unless such holder shall have previously given the
Trustee written notice of a continuing Event of Default, the holders of not less
than 25% in principal amount of the outstanding Notes shall have made written
request to the Trustee to institute proceedings in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity and the Trustee
shall not have received from the holders of a majority in principal amount of
the outstanding Notes a direction inconsistent with such request, and shall have
failed to institute any such proceeding, for 60 days after receipt of such
notice, request and offer of indemnity. The foregoing shall not apply to any
suit instituted by the holder of this Note for the enforcement of any payment of
principal hereof, premiums if any, or interest hereon on or after the respective
due dates expressed herein or for the enforcement of the right to convert this
Note as provided in the Indenture.

         No reference herein to the Indenture and no provision of this Note or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of, premium, if any, and
interest on this Note at the times, places and rate, and in the coin or
currency, herein prescribed or to convert this Note as provided in the
Indenture.

         As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Note is registrable on the Note register upon
surrender of this Note for registration of transfer at the Corporate Trust
Office of the Trustee or at such other office or agency of the Company as may be
designated by it for such purpose in the Borough of Manhattan, The City of New
York (which shall initially be an office or agency of the Trustee), or at such
other offices or agencies as the Company may designate, duly endorsed by, or
accompanied by a written instrument of transfer in form satisfactory to the
Company and the


                                      A-9
<PAGE>

Note registrar duly executed by, the holder thereof or his attorney duly
authorized in writing, and thereupon one or more new Notes, of authorized
denominations and for the same aggregate principal amount, will be issued to the
designated transferee or transferees by the Note registrar. No service charge
shall be made for any such registration of transfer or exchange, but the Company
may require payment of a sum sufficient to recover any tax or other governmental
charge payable in connection therewith, other than as provided in the Indenture.

         Prior to due presentation of this Note for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name Note is registered, as the owner thereof for all
purposes, whether or not such Note be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

         No recourse for the payment of the principal (and premium, if any) or
interest on this Note and no recourse under or upon any obligation, covenant or
agreement of the Company in the Indenture or any indenture supplemental thereto
or in any Note, or because of the creation of any indebtedness represented
thereby, shall be had against any incorporator, stockholder, employee, agent,
officer or director or subsidiary, as such, past, present or future, of the
Company or of any successor corporation, either directly or through the Company
or any successor corporation, whether by virtue of any constitution, statute or
rule of law or by the enforcement of any assessment or penalty or otherwise, all
such liability being, by the acceptance hereof and as part of consideration for
the issue hereof, expressly waived and released.

         THE INDENTURE AND THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, UNITED STATES OF AMERICA
(WITHOUT REGARD TO THE CONFLICT OF LAW PROVISIONS THEREOF).

         All terms used in this Note which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.


                                      A-10
<PAGE>

                                  ABBREVIATIONS

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

         TEN COM           -    as tenants in common

         TEN ENT           -    as tenants by the entireties (Cust)

         JT TEN            -    as joint tenants with right of survivorship and
                                not as tenants in common

         UNIF GIFT MIN ACT -    _________________ Custodian _____________
                                                               (Minor)
                                 under Uniform Gifts to Minors Act _____________
                                                                     (State)

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


                                      A-11
<PAGE>

                    ELECTION OF HOLDER TO REQUIRE REPURCHASE

         (1) Pursuant to Article 16 of the Indenture, the undersigned hereby
elects to have this Note repurchased by the Company.

         (2) The undersigned hereby directs the Trustee or the Company to pay to
the undersigned an amount in cash or, at the Company's election, Common Stock
valued as set forth in the Indenture, equal to 100% of the principal amount to
be repurchased (as set forth below), plus interest accrued to the Repurchase
Date, as provided in the Indenture.

                               Dated: _________________________________________
                               ________________________________________________
                               ________________________________________________

                               Signature(s)

                               Signature(s) must be guaranteed by an Eligible
                               Guarantor Institution with membership in an
                               approved signature guarantee program pursuant to
                               Rule 17Ad-15 under the Securities Exchange Act of
                               1934.

                               ________________________________________________
                               Signature Guaranteed

Principal amount to be repurchased (at least U.S. $1,000 or an integral multiple
thereof $1,000): _______________________________

Remaining principal amount following such repurchase:
_________________________________

NOTICE: The signature to the foregoing Election must correspond to the Name as
written upon the face of this Note in every particular, without alteration or
any change whatsoever.


                                      A-12
<PAGE>

                                CONVERSION NOTICE

         The undersigned holder of this Note hereby irrevocably exercises the
option to convert this Note, or any portion of the principal amount hereof
(which is U.S.$1,000 or an integral multiple of U.S.$1,000 in excess thereof,
PROVIDED that the unconverted portion of such principal amount is U.S. $1,000 or
any integral multiple of U.S. $1,000 in excess thereof) below designated, into
shares of Common Stock in accordance with the terms of the Indenture referred to
in this Note, and directs that such shares, together with a check in payment for
any fractional share and any Notes representing any unconverted principal amount
hereof, be delivered to and be registered in the name of the undersigned unless
a different name has been indicated below. If shares of Common Stock or Notes
are to be registered in the name of a Person other than the undersigned, (a) the
undersigned will pay all transfer taxes payable with respect thereto and (b)
signature(s) must be guaranteed by an Eligible Guarantor Institution with
membership in an approved signature guarantee program pursuant to Rule 17Ad-15
under the Securities Exchange Act of 1934. Any amount required to be paid by the
undersigned on account of interest accompanies this Note.

Dated: _____________________      ________________________________________

                                  ________________________________________
                                  Signature(s)

If shares or Notes are to be registered in the name of a Person other than the
holder, please print such Person's name and address:

_______________________________
         Name


_______________________________
         Address


_______________________________
Social Security or other Identification
Number, if any


_______________________________
Signature Guaranteed


                                      A-13
<PAGE>

If only a portion of the Notes is to be converted, please indicate:

1.    Principal amount to be converted:

               U.S. $ ___________

2.    Principal amount and denomination of Notes representing unconverted
      principal amount to be issued:

               Amount U.S. $___________

      (U.S.$1,000 or any integral multiple of U.S.$1,000 in excess thereof,
      provided that the unconverted portion of such principal amount is U.S.
      $1,000 or any integral multiple of U.S. $1,000 in excess thereof)


                                      A-14
<PAGE>

                               FORM OF ASSIGNMENT

         For value received ________________ hereby sell(s), assign(s) and
transfer(s) unto ________________ (Please insert social security or other
identifying number of assignee) the within Note, and hereby irrevocably
constitutes and appoints ____________________ as attorney to transfer the said
Note on the books of the Company, with full power of substitution in the
premises.

Dated: _____________________      ________________________________________

                                  ________________________________________
                                  Signature(s)

                                  Signature(s) must be guaranteed by an Eligible
                                  Guarantor Institution with membership in an
                                  approved signature guarantee program pursuant
                                  to Rule 17Ad-15 under the Securities Exchange
                                  Act of 1934.


                                      A-15
<PAGE>

================================================================================

                                  IBASIS, INC.

                                       and

                             [THE BANK OF NEW YORK]

                                   AS TRUSTEE

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

                                    INDENTURE

                        DATED AS OF __________ ___, 2000

================================================================================

                   __% CONVERTIBLE SUBORDINATED NOTES DUE 2005
<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                 PAGE

<S>               <C>                                                                                            <C>
ARTICLE 1. DEFINITIONS                                                                                            2
   Section 1.1.   DEFINITIONS                                                                                     2

ARTICLE 2 ISSUE, DESCRIPTION, EXECUTION, REGISTRATION AND EXCHANGE OF NOTES                                       8
   Section 2.1.   DESIGNATION, AMOUNT AND ISSUE OF NOTES                                                          8
   Section 2.2.   FORM OF NOTES.                                                                                  8
   Section 2.3.   DATE AND DENOMINATION OF NOTES; PAYMENTS OF INTEREST                                            9
   Section 2.4.   EXECUTION OF NOTES                                                                             10
   Section 2.5.   EXCHANGE AND REGISTRATION OF TRANSFER OF NOTES; DEPOSITARY                                     11
   Section 2.6.   MUTILATED, DESTROYED, LOST OR STOLEN NOTES                                                     13
   Section 2.7.   TEMPORARY NOTES                                                                                14
   Section 2.8.   CANCELLATION OF NOTES PAID, ETC.                                                               15

ARTICLE 3.  REDEMPTION OF NOTES                                                                                  15
   Section 3.1.   REDEMPTION PRICES                                                                              15
   Section 3.2.   NOTICE OF REDEMPTION; SELECTION OF NOTES                                                       16
   Section 3.3.   PAYMENT OF NOTES CALLED FOR REDEMPTION                                                         17
   Section 3.4.   CONVERSION ARRANGEMENT ON CALL FOR REDEMPTION                                                  18

ARTICLE 4.  SUBORDINATION OF NOTES                                                                               19
   Section 4.1.   AGREEMENT OF SUBORDINATION                                                                     19
   Section 4.2.   PAYMENTS TO NOTEHOLDERS                                                                        19
   Section 4.3.   BANKRUPTCY AND DISSOLUTION, ETC.                                                               21
   Section 4.4.   SUBROGATION OF NOTES                                                                           22
   Section 4.5.   AUTHORIZATION BY NOTEHOLDERS                                                                   23
   Section 4.6.   NOTICE TO TRUSTEE                                                                              23
   Section 4.7.   TRUSTEE'S RELATION TO SENIOR INDEBTEDNESS                                                      25
   Section 4.8.   NO IMPAIRMENT OF SUBORDINATION                                                                 25
   Section 4.9.   CERTAIN CONVERSIONS DEEMED PAYMENT                                                             25

ARTICLE 5.  PARTICULAR COVENANTS OF THE COMPANY                                                                  26
   Section 5.1.   PAYMENT OF PRINCIPAL, PREMIUM AND INTEREST                                                     26
   Section 5.2.   MAINTENANCE OF OFFICE OR AGENCY                                                                26
   Section 5.3.   APPOINTMENTS TO FILL VACANCIES IN TRUSTEE'S OFFICE                                             27
   Section 5.4.   PROVISIONS AS TO PAYING AGENT                                                                  27
   Section 5.5.   EXISTENCE                                                                                      28
   Section 5.6.   RESERVED                                                                                       28
   Section 5.7.   STAY, EXTENSION AND USURY LAWS                                                                 28
   Section 5.8.   COMPLIANCE CERTIFICATE                                                                         28
   Section 5.9.   FURTHER INSTRUMENTS AND ACTS                                                                   29
   Section 5.10.  Payment of Taxes and Other Claims                                                              29

ARTICLE 6.  NOTEHOLDERS' LISTS AND REPORTS BY THE COMPANY AND THE TRUSTEE                                        29
   Section 6.1.   NOTEHOLDERS' LISTS                                                                             29
   Section 6.2.   PRESERVATION AND DISCLOSURE OF LISTS                                                           30
   Section 6.3.   REPORTS BY TRUSTEE                                                                             30
   Section 6.4.   REPORTS BY COMPANY                                                                             30

ARTICLE 7.  DEFAULTS AND REMEDIES                                                                                31
   Section 7.1.   EVENTS OF DEFAULT                                                                              31
   Section 7.2.   PAYMENTS OF NOTES ON DEFAULT; SUIT THEREFOR                                                    34
   Section 7.3.   APPLICATION OF MONIES COLLECTED BY TRUSTEE                                                     35
<PAGE>

   Section 7.4.   PROCEEDINGS BY NOTEHOLDER                                                                      36
   Section 7.5.   PROCEEDINGS BY TRUSTEE                                                                         37
   Section 7.6.   REMEDIES CUMULATIVE AND CONTINUING                                                             37
   Section 7.7.   DIRECTION OF PROCEEDINGS AND WAIVER OF DEFAULTS BY MAJORITY OF NOTEHOLDERS.                    37
   Section 7.8.   NOTICE OF DEFAULTS.                                                                            38
   Section 7.9.   UNDERTAKING TO PAY COSTS.                                                                      38
   Section 7.10.  DELAY OR OMISSION NOT WAIVER                                                                   38

ARTICLE 8  CONCERNING THE TRUSTEE                                                                                39
   Section 8.1.   DUTIES AND RESPONSIBILITIES OF TRUSTEE.                                                        39
   Section 8.2.   RELIANCE ON DOCUMENTS, OPINIONS, ETC.                                                          40
   Section 8.3.   NO RESPONSIBILITY FOR RECITALS, ETC.                                                           41
   Section 8.4.   TRUSTEE, PAYING AGENTS, CONVERSION AGENTS OR REGISTRAR MAY OWN NOTES.                          41
   Section 8.5.   MONIES TO BE HELD IN TRUST.                                                                    41
   Section 8.6.   COMPENSATION AND EXPENSES OF TRUSTEE.                                                          42
   Section 8.7.   OFFICERS' CERTIFICATE AS EVIDENCE.                                                             42
   Section 8.8.   CONFLICTING INTERESTS OF TRUSTEE.                                                              43
   Section 8.9.   ELIGIBILITY OF TRUSTEE.                                                                        43
   Section 8.10.  RESIGNATION OR REMOVAL OF TRUSTEE.                                                             43
   Section 8.11.  ACCEPTANCE BY SUCCESSOR TRUSTEE                                                                44
   Section 8.12.  SUCCESSION BY MERGER, ETC.                                                                     45
   Section 8.13.  LIMITATION ON RIGHTS OF TRUSTEE AS CREDITOR                                                    45

ARTICLE 9  CONCERNING THE NOTEHOLDERS                                                                            46
   Section 9.1.   ACTION BY NOTEHOLDERS                                                                          46
   Section 9.2.   PROOF OF EXECUTION BY NOTEHOLDERS.                                                             46
   Section 9.3.   WHO ARE DEEMED ABSOLUTE OWNERS                                                                 46
   Section 9.4.   COMPANY-OWNED NOTES DISREGARDED                                                                47
   Section 9.5.   REVOCATION OF CONSENTS; FUTURE HOLDERS BOUND                                                   47

ARTICLE 10. NOTEHOLDERS' MEETINGS                                                                                47
   Section 10.1.    PURPOSE OF MEETINGS                                                                          47
   Section 10.2.    CALL OF MEETINGS BY TRUSTEE                                                                  48
   Section 10.3.    QUORUM                                                                                       48
   Section 10.4.    CALL OF MEETINGS BY COMPANY OR NOTEHOLDERS                                                   49
   Section 10.5.    QUALIFICATIONS FOR VOTING                                                                    49
   Section 10.6.    REGULATIONS                                                                                  49
   Section 10.7.    VOTING                                                                                       50
   Section 10.8.    NO DELAY OF RIGHTS BY MEETING                                                                50

ARTICLE 11.  SUPPLEMENTAL INDENTURES                                                                             51
   Section 11.1.    SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF NOTEHOLDERS                                       51
   Section 11.2.    SUPPLEMENTAL INDENTURES WITH CONSENT OF NOTEHOLDERS                                          52
   Section 11.3.    EFFECT OF SUPPLEMENTAL INDENTURES                                                            53
   Section 11.4.    NOTATION ON NOTES                                                                            54
   Section 11.5.    Evidence of Compliance of Supplemental Indenture to Be Furnished Trustee                     54

ARTICLE 12. CONSOLIDATION, MERGER, SALE, CONVEYANCE AND LEASE                                                    54
   Section 12.1.    COMPANY MAY CONSOLIDATE, ETC. ON CERTAIN TERMS                                               54
   Section 12.2.    SUCCESSOR CORPORATION TO BE SUBSTITUTED                                                      55
   Section 12.3.    OPINION OF COUNSEL TO BE GIVEN TRUSTEE                                                       56

ARTICLE 13.  SATISFACTION AND DISCHARGE OF INDENTURE                                                             56
   Section 13.1.    DISCHARGE OF INDENTURE                                                                       56
   Section 13.2.    DEPOSITED MONIES TO BE HELD IN TRUST BY TRUSTEE                                              56
   Section 13.3.    PAYING AGENT TO REPAY MONIES HELD                                                            57
   Section 13.4.    RETURN OF UNCLAIMED MONIES                                                                   57
<PAGE>

   Section 13.5.    REINSTATEMENT                                                                                57

ARTICLE 14. IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS                                      57
   Section 14.1.    INDENTURE AND NOTES SOLELY CORPORATE OBLIGATIONS                                             57

ARTICLE 15.  CONVERSION OF NOTES                                                                                 58
   Section 15.1.    RIGHT TO CONVERT                                                                             58
   Section 15.2.    EXERCISE OF CONVERSION PRIVILEGE; ISSUANCE OF COMMON STOCK ON CONVERSION;
   NO ADJUSTMENT FOR INTEREST OR DIVIDENDS                                                                       58
   Section 15.3.    CASH PAYMENTS IN LIEU OF FRACTIONAL SHARES                                                   60
   Section 15.4.    CONVERSION PRICE                                                                             60
   Section 15.5.    ADJUSTMENT OF CONVERSION PRICE                                                               61
   Section 15.6.    EFFECT OF RECLASSIFICATION, CONSOLIDATION, MERGER OR SALE                                    70
   Section 15.7.    TAXES ON SHARES ISSUED                                                                       72
   Section 15.8.    RESERVATION OF SHARES; SHARES TO BE FULLY PAID; LISTING OF COMMON STOCK                      72
   Section 15.9.    RESPONSIBILITY OF TRUSTEE                                                                    72
   Section 15.10.   NOTICE TO HOLDERS PRIOR TO CERTAIN ACTIONS                                                   73

ARTICLE 16.  REPURCHASE UPON A REPURCHASE EVENT                                                                  74
   Section 16.1.    REPURCHASE RIGHT                                                                             74
   Section 16.2.    NOTICES; METHOD OF EXERCISING REPURCHASE RIGHT, ETC.                                         74
   Section 16.3.    CONDITIONS TO THE COMPANY'S ELECTION TO PAY THE REPURCHASE PRICE IN COMMON STOCK             77
   Section 16.4.    CERTAIN DEFINITIONS                                                                          78

ARTICLE 17.  MISCELLANEOUS PROVISIONS                                                                            79
   Section 17.1.    PROVISIONS BINDING ON COMPANY'S SUCCESSORS                                                   79
   Section 17.2.    OFFICIAL ACTS BY SUCCESSOR CORPORATION                                                       79
   Section 17.3.    ADDRESSES FOR NOTICES, ETC                                                                   79
   Section 17.4.    GOVERNING LAW                                                                                80
   Section 17.5.    EVIDENCE OF COMPLIANCE WITH CONDITIONS PRECEDENT; CERTIFICATES TO TRUSTEE                    80
   Section 17.6.    LEGAL HOLIDAYS                                                                               81
   Section 17.7.    NO SECURITY INTEREST CREATED                                                                 81
   Section 17.8.    TRUST INDENTURE ACT                                                                          81
   Section 17.9.    BENEFITS OF INDENTURE                                                                        81
   Section 17.10.   TABLE OF CONTENTS, HEADINGS, ETC.                                                            81
   Section 17.11.   AUTHENTICATING AGENT                                                                         81
   Section 17.12.   EXECUTION IN COUNTERPARTS                                                                    82
</TABLE>
<PAGE>

Reconciliation and tie between Trust Indenture Act of 1939 (the "TIA" or "Trust
Indenture Act") and this Indenture, dated as of ___________, 2000.

<TABLE>
<CAPTION>
TRUST INDENTURE ACT SECTION                                                        INDENTURE SECTION

<S>             <C>                                                                       <C>
Section  310    (a)(1)....................................................................8.9
                (a)(2)....................................................................8.9
                (b).......................................................................8.8, 8.9
Section  311    (a).......................................................................8.13
                (b).......................................................................8.13
Section  312    (a).......................................................................6.1
                (b).......................................................................6.2
Section  313    (a).......................................................................6.3
                (b).......................................................................6.3
                (c).......................................................................6.3
                (d).......................................................................6.3
Section  314    (a).......................................................................6.4
                (a)(4)....................................................................5.8
                (b).......................................................................N.A.
                (c)(1)....................................................................17.5
                (c)(2)....................................................................17.5
                (c)(3)....................................................................17.8
                (e).......................................................................17.5
Section  315    (a)........................................................................8.1
                (b).......................................................................7.8
                (c).......................................................................8.1
                (d).......................................................................8.1
                (e).......................................................................7.9
Section  316    (a) (last sentence).......................................................9.4
                (a)(1)(A).................................................................7.7
                (a)(1)(B).................................................................7.7
                (b).......................................................................7.4
                (c).......................................................................9.1
Section  317    (a)(1)....................................................................7.2
                (a)(2)....................................................................7.2
                (b).......................................................................5.4
Section  318    (a).......................................................................17.8
                (c).......................................................................17.8
</TABLE>

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

NOTE:         This reconciliation and tie shall not, for any purpose, be deemed
              to be a part of this Indenture.

              Attention should also be directed to Section 318(c) of the Trust
Indenture Act, which provides that the provisions of Sections 310 to and
including 317 of the Trust Indenture Act are a part of and govern every
qualified indenture, whether or not physically contained therein.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-END>                               MAR-31-2000
<CASH>                                     352,828,447
<SECURITIES>                                39,000,000
<RECEIVABLES>                                7,441,142
<ALLOWANCES>                                 1,177,000
<INVENTORY>                                          0
<CURRENT-ASSETS>                           399,862,182
<PP&E>                                      39,291,571
<DEPRECIATION>                               5,138,017
<TOTAL-ASSETS>                             440,020,214
<CURRENT-LIABILITIES>                       18,885,929
<BONDS>                                    164,156,283
                                0
                                          0
<COMMON>                                        33,832
<OTHER-SE>                                 256,944,170
<TOTAL-LIABILITY-AND-EQUITY>               440,020,214
<SALES>                                              0
<TOTAL-REVENUES>                             9,725,492
<CGS>                                                0
<TOTAL-COSTS>                               21,923,666
<OTHER-EXPENSES>                           (2,451,292)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             909,265
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (10,656,147)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (10,656,147)
<EPS-BASIC>                                     (0.33)
<EPS-DILUTED>                                        0


</TABLE>


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