Document:

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               WWEXCHANGE NETWORK SERVICES AGREEMENT BY & BETWEEN
                     TELTRAN INTERNATIONAL, INC. & ITXC CORP

      THIS WWEXCHANGE NETWORK SERVICES ORIGINATION/TERMINATION AGREEMENT (the
"Agreement") is made and entered into as of this day of , 1999 (the "Effective
Date"), by and between ITXC CORP, a Delaware corporation, with a principal
office at 600 College Road East, Princeton, New Jersey 08540 ("ITXC") and
Teltran International, Inc., a Delaware corporation with a principal office at
One Penn Plaza, Suite 4632, New York, NY 10119 ("Carrier" or "Teltran")).

      The Carrier and ITXC (hereinafter individually referred to as "Party" and
jointly as "Parties") agree to provide to and purchase from each other Internet
telephony and/or telecommunication services, further described in Section 1.1 of
this Agreement, hereinafter referred to as the "Services".

      IN CONSIDERATION of the premises and mutual agreements contained herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the Parties, intending to be legally bound, hereby
agree hereto as follows:

   1.  Termination Services to be provided

   1.1 Each Party will arrange for and be responsible for its costs associated
with terminating Internet telephony or Public Switched Telephone Network
("PSTN") calls from Internet Telephony and/or PSTN networks to be terminated
through the PSTN 24 hours a day, 7 days a week, in the locations and at the
rates listed in Attachment 1 or as may be amended from time to time as the
Parties may mutually agree. Each Party is solely responsible for and will
provide its customers/subscribers originating calls that terminate on the other
Party s equipment with all the necessary support as hereinafter more
specifically set forth.

   1.2 Each Party or its customers will be entirely responsible for providing
all end-user or caller related services for each Party's own customers,
including but not limited to authentication, authorization of customers,
marketing, sales, distribution, billing, collections, customer care, and
technical support, solely for its own originated traffic (hereinafter referred
to as Subscriber Services).

   1.3 Each party will provide English-speaking technical support staff 24 hours
a day, 7 days a week.

   2.  Routing

   Each Party reserves the right to route calls which it originates at its sole
discretion and/or use supplemental or alternative means of termination,
including without limitation the use of the PSTN.

3. Charges, Billing and Payment

   3.1 Termination charges applicable to the Services between the Carrier and
ITXC shall be set out in Attachment 1 to the Agreement. The service areas and
the rates listed in Attachment 1 are subject to change by either Party with five
(5) days written notice to the other Party. All rates exclude termination to
Special Service Numbers (i.e. Audiotext, 900 equivalent, Caller pay cellular
where the caller charge exceeds standard in-country termination rates and any
other premium charge calls.), unless explicitly priced otherwise.

   3.2 Once a month, each Party shall provide the other with an invoice that
includes, at a minimum, the following information: total number of calls, total
duration of calls, the country and city (if applicable) of termination; the
price per minute per country of termination and a statement setting forth the
total charges for the service month.

   3.3 Unless otherwise noted herein, calls will be billed in six second
increments with a 30 second initial increment, except Mexico which shall be in
60 second increments. Any process for the rounding of charges shall be equally
applied by the Parties.

   3.4 Each Party shall provide to the other a monthly invoice as soon as
practicable after the close of the service month to which the invoice relates
but in no event later than 30 days after the close of the month in which the
traffic

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listed on the invoice was delivered, unless otherwise mutually agreed to by the
Parties in writing. Net settlement of invoices shall occur, such that the
outstanding balance due from one Party shall be offset by the balance due from
the other Party. Each Party shall pay to the other all amounts shown on an
invoice, after taking into account the net settlement procedure described above,
within seven business days of its receipt of such invoice. Both Parties agree to
weekly, bi-monthly or every other week invoicing should it become necessary due
to the specifics of termination to a certain country. In instances where monthly
invoicing is not done, the invoicing and payment terms shall be negotiated
separately and added to this Agreement as an addendum.

   3.5 A monthly invoice shall be deemed to have been accepted by a Party if
either Party does not object in writing within 60 days receipt following the
date of the invoice. If an objection is made, the Parties shall use commercially
reasonable good faith efforts to resolve the dispute promptly. Neither Party may
withhold payment of a disputed amount and such disputed amounts shall be paid
initially. Failure to pay the disputed amount as required herein, may result in
the suspension of Services after a five day written notice period, and is a
material breach of this Agreement.

   3.6 All monetary references in this Agreement are denominated in U.S.
dollars and all financial transactions under this Agreement must be settled
in U.S. dollars.

   3.7 Call Detail Records (CDRs) of the terminating Party shall be the basis
for billing. In the event of a billing dispute between the Parties the
originating and terminating CDRs of both Parties shall be considered, using
mutually acceptable and industry standard practices for CDR comparison and
reconciliation.

4. Technical and Operational Matters

   4.1 Each Party will install, at its expense, all equipment within its own
network reasonably necessary to provide the Services in the locations in which
it is terminating calls as indicated in Attachment 1. The Parties will agree on
a detailed schedule for testing, and trials of Internet Telephony Services and
to use commercially diligent efforts to achieve deployment in a timely fashion.

   4.2 In the event of interruption of or natural degradation of the quality of
the Service, for purposes of a pre-service trial or otherwise, the Parties shall
use commercially reasonable efforts to restore the normal operation of the
Service with the least possible delay.

5. Branding; Publicity

The Parties agree to announce their deployment of commercial Internet Telephony
services and issue a press release to this effect within 15 days of execution of
this Agreement. The exact nature and content of this publicity shall be mutually
agreed upon by the Parties. Neither Party shall use the other Party s trademark
either on or in connection with the Services, Subscriber Services or otherwise
without the prior written consent of the other Party. The Parties agree that no
public statements or announcements relating to this Agreement, the Services,
Subscriber Services or their relationship shall be made by either Party without
the prior written consent of the other Party.

6. Term and Termination

This Agreement is effective for an initial term beginning on the Effective Date
and ending May 19, 2002, unless earlier terminated as provided herein.
Thereafter, this Agreement shall remain in effect from year to year unless and
until terminated by either Party by providing a written notice of cancellation
not less than 60 days prior to the intended cancellation date or as otherwise
provided herein. Notwithstanding the foregoing, either Party may terminate this
Agreement with 60 days prior written notice to the other Party.

Either Party may terminate this Agreement without any further liability to the
other Party, if such Party fails to (a) pay any fee or amount due under this
Agreement within 15 days of the due date of such fee or amount, or (b) perform
any other agreement under this Agreement, and such failure continues uncured for
a period of 30 days after the date of written notice identifying the breach to
the non-performing Party. Except where otherwise

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specifically noted, either Party may suspend Services immediately if it
reasonably suspects fraud or the threat of damage to its network by the other
Party [or its customers].

   7.  Representations and Warranties

   Each Party represents and warrants to the other: (a) it has all requisite
legal power and authority to execute and deliver this Agreement and perform its
obligations hereunder; and (b) no consent, approval, order or authorization of,
and/or registration, declaration or filing with, any court, administrative
agency or commission or other governmental authority or instrumentality, other
than those which have already been obtained, are required in connection with the
execution, delivery or performance of this Agreement.

8. Indemnification, Limitation of Liability and No Warranty

Each Party shall defend, indemnify and hold the other party and its directors,
officers, employees, agents and sub-contractors harmless from and against, any
and all suits, actions and proceedings, claims, liabilities, losses, damages
costs and expenses, arising directly or indirectly in connection with a
violation of law, regulation or order or the breach by it of any of its
obligations or representations hereunder, except to the extent such loss,
damage, cost or expense is due to any gross negligence or willful misconduct of
the Party seeking indemnification hereunder, or its directors, officers,
employees, agents or sub-contractors.

Unless caused or contributed to by such Party's gross negligence or willful
misconduct, neither Party shall be liable to the other for any special,
indirect, incidental, consequential, or exemplary damages, including without
limitation, loss of revenue, profits, customers, clients or goodwill arising in
any manner from this Agreement and the performance or non-performance of
business hereunder. The liability of either Party with respect to the
installation, provision, termination, maintenance, repair, interruption, or
restoration, of any Services shall not exceed an amount equal to the charge
applicable under this Agreement to the period during which services were
affected.

Each Party undertakes no liability whatever whether in contract, tort (including
liability for negligence) or otherwise for the acts or omissions of other
providers of telecommunication service or equipment or for faults in or failures
of such provider's service and/or equipment.

Each Party acknowledges that it is technically impracticable to provide service
free of faults and free of capacity limitations and the parties do not undertake
to do so. Neither Party makes any warranty, express or implied, with respect to
the Services. Each Party also makes no express or implied representations or
endorsements regarding any merchandise, information, products or services
provided by others or for any performance hereunder. The Services and associated
pricing are provided on an as is and as available basis without warranties of
any kind, express or implied, including but not limited to warranties of title
and non-infringement.

9. Confidentiality

All information exchanged between the Parties under this Agreement or during the
negotiations preceding this Agreement and relating either to the terms and
conditions of this Agreement or any activities contemplated by this Agreement
shall be confidential to them, their employees, their subsidiaries and legal
advisers and shall not be disclosed to any third party not used for any purpose
other than the performance of this Agreement without prior written consent of
both Parties, except that such information may be disclosed if required by any
government authority or regulatory body.

10. Assignment.

Neither Party may assign this Agreement, in whole or in part, without the prior
written notification of the other Party. Notwithstanding the foregoing, either
Party may assign this Agreement and/or assign its rights and duties hereunder,
in whole or in part, at any time and without the notification or consent, to any
of its present or future parent, affiliate or subsidiary.

                                     p. -3
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   11.  Notices.

All notices, requests, consents, and other communications hereunder shall be in
writing and shall be deemed effectively given and received upon delivery in
person, or one business day after delivery by international overnight courier
service, if sent for next business day delivery, or by telecopier (FAX)
transmission with sender s acknowledgment of transmission receipt, email with
recipient's acknowledgement of transmission receipt, or five business days after
deposit via certified or registered mail, return receipt requested, in each case
addressed as follows:

ITXC                                  CARRIER
Attn: Legal Dept.                   Attn: Peter Biagioli_____________________
----                                Teltran International, Inc.
ITXC CORP                           One Penn Plaza, Suite 4632
600 College Road East               New York, NY 10119_________________________
Princeton, NJ 08540                 1.212.643.1600
Phone: +1 (609) 419-1500            1.212.643.1997_________________________
Fax: +1 (609) 419-1511

Billing Contacts:
Attn: Billing Dept.                 Attn: Jim Supple___________________
ITXC CORP                           same as above
600 College Road East
Princeton, NJ 08540
Phone: +1 (609) 419-1500
Fax: +1 (609) 419-1511

12. Taxes

   Each party is responsible for complying with and paying all taxes or
surcharge assessed by government authorities with jurisdiction over its
activities. Termination charges in Section 3.1 shall not be reduced by payer to
reflect the effect of such taxes.

   13.  Applicable Law

   This Agreement and matters connected with the performance thereof will be
construed, interpreted, applied and governed in all respects in accordance with
the law of the State of New York, U.S.A. without regard to such jurisdiction's
conflict of laws provisions.

   14.  Relationship of the Parties

   Each Party will conduct itself under this Agreement as an independent
contractor and not as an agent, partner, joint venturer or employee of the other
Party, and will not bind or attempt to bind the other Party to any contract.
Nothing contained in this Agreement will be deemed to form a partnership or
joint venture between the Parties.

   15.  No Third Party Rights

   This Agreement is not intended and will not be construed to create any rights
or remedies in any parties other than ITXC and the Carrier and no person will
assert any rights as a third party beneficiary hereunder.

   16.  Alternative Dispute Resolution.
   The Parties agree that they will make a good faith effort to reach an
amicable resolution in the event of a dispute concerning this Agreement.
However, if such an amicable resolution is not reached, the Parties agree that
all disputes arising in connection with the Agreement shall be finally settled
by arbitration under the American Arbitration Association rules and procedures.
Arbitration shall be held in New York, New York, U.S.A. and shall be conducted
in English.

   17.  Government or Other Regulation

   Each Party is independently responsible for ensuring that its activities
(including the offering or providing of services or facilities) complies with
applicable laws and government or other regulation, including regulation of
common carrier telecommunications services and regulation of marketing
activities. Each Party will cooperate with

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the other in defending any civil, criminal or other claim threatened or brought
by any governmental agency or third party.

   18.  Strict Compliance.

      No failure of a Party to exercise any right or to insist upon strict
compliance by the other Party with any obligation and no custom or practice of
the Parties at variance with this Agreement shall constitute a waiver of the
right of a party to demand exact compliance. Waiver by one Party of any
particular default by the other Party shall not affect or impair a Party's
rights in respect to any subsequent default of the same or of a different
nature, nor shall any delay or omission of a Party to exercise any rights
arising from such default affect or impair the rights of that Party as to such
default or any subsequent default.

   19.  Entire Agreement.

      This Agreement constitutes the entire Agreement between the Parties and
shall supersede all previous negotiations, commitments, representations and
writings, written or oral. No custom, industry standard or course of dealing
between the Parties shall in any way vary or alter the terms and conditions of
this Agreement. This Agreement shall be deemed to have been drafted by both
Parties and, in the event of a dispute shall not be construed against either
Party. If any term or provision of this Agreement is held to be invalid, illegal
or unenforceable in any respect, such determination will not affect any other
provision of this Agreement, but such provision or provision will be ineffective
only to the extent of such invalidity, illegality or unenforceability without
invalidating the remainder of such provision or provisions or this Agreement.

   20.  Force Majeure.

      If the performance of this Agreement is interfered with by reason or any
circumstances beyond the reasonable control of the Party affected including acts
of God, fire, explosion, vandalism, fiber optic cable cut, storm, extreme
temperatures or other similar catastrophes; any law, order, regulation,
direction, action or request of any national government, including state,
provincial and local governments having jurisdiction over either Party, or of
any department, agency, commission, court, bureau, corporation or other
instrumentality of any one or more said governments, or of any civil or military
authority; national emergencies, insurrections, riots, wars, or strikes,
lock-outs, work stoppages or other labor difficulties; actions or inactions of a
third party provider or operator of facilities employed in provision of the
Services ("Force Majeure"), then the Party affected shall be excused from such
performance on a day-to-day basis.

   21.    Authoritative Version.

      The English version of this Agreement shall be the authoritative version
of this Agreement for all purposes. In the event of a conflict between the
English version and any translation of this Agreement, the English version shall
control.

   22.  Amendments.

      Any alteration or amendment to this Agreement or its exhibit(s), excluding
rates, shall be effective only if presented in writing and signed by authorized
representatives of both Parties (in the case of ITXC, only a Corporate Officer).
Notwithstanding the foregoing, rates may be changed unilaterally by either Party
in accordance with Section 3.1.

                                                                           p. -5
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   IN WITNESS WHEREOF, the Parties hereto have caused this WWeXchange Network
Services Agreement to be duly executed and delivered.

ITXC:                            CARRIER:
ITXC CORP.

By:                                    By:
   ------------------------------          ----------------------------

Name:                                  Name:   Byron R. Lerner
     ----------------------------                              -----------------
Title:                                 Title:  President & CEO
      ---------------------------                             ------------------
Date:                                  Date:
     ----------------------------           --------------------

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Exhibit 1: Terms and Conditions to WWEXCHANGE NETWORK SERVICES AGREEMENT BY &
BETWEEN TELTRAN INTERNATIONAL, INC. & ITXC CORP

1.    ITXC agrees that from the date of execution of this Agreement and
      Addendum thereto until January 31, 2000, to provide termination rates
      to Teltran, which shall not exceed those listed in Exhibit 2. ITXC
      shall not raise rates unless its termination costs increase or are
      above those rates listed in Exhibit 2 or cost-competitive Internet
      telephony is interrupted or of insufficient quality or capacity such
      that these rates provided to Teltran become commercially unreasonable
      to ITXC.

2.    This agreement shall include Teltran's wholly owned subsidiary, ChannelNET
      Ltd with offices at Enterprise House, 15 Whitworth Street West, Manchester
      M1 5WA, United Kingdom.

3.    The Parties agree that their rights to provide Termination Services are
      non-exclusive and that either Party may enter into additional agreement
      with other parties such services.

4.    ITXC agrees to install at its cost, (5) E-1 gateways in accordance with
      the terms and conditions of this Agreement.

5.    The Parties agree that this Agreement is non-exclusive and that either
      Party may purchase or provide termination services to other parties.

6.    Until such time as Teltran purchases its own switching equipment, ITXC
      agrees to use commercially reasonable efforts to provide weekly estimated
      usage reports to Teltran.

Exhibit 2: Termination rates

                                 (see attached)

                                                                           p. -7<PAGE>

                             STOCK OPTION AGREEMENT

OPTION AGREEMENT, made as of February 1, 2000 between TELTRAN INTERNATIONAL
GROUP, INC. (hereinafter called the "Company"), and BRYON R. LERNER providing
services for or on behalf or at the request of the Company or subsidiary of the
Company (hereinafter called the "Optionee").

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

      Optionee is an executive officer of the Company and the Company desires to
incentivize the efforts of Optionee, by affording the Optionee an opportunity to
purchase shares of its common stock in light of the extraordinary growth of the
Company.

      NOW, THEREFORE, in consideration of the mutual covenants hereinafter set
forth and for other good and valuable consideration, the parties hereto agree as
follows:

      1.   Certain Definitions.

           a. "Board of Directors" shall refer to the Board of Directors of the
Company.

           b. Common Shares shall mean the Common Stock of the Company as
authorized at the date hereof.

      2.   Grant of Option/Exercise.

           a.  The Company hereby grant to the Optionee, as a matter of separate
agreement and not in lieu of salary or any other compensation for services, the
right and option (hereinafter called the "Option") to purchase on the terms and
conditions set forth herein 890,500 shares of Common Stock (the "Option Shares")
eight dollars per share until the end of business of August 1, 2000 after which
time the option price shall be one dollar per share ("Exercise Price").
Notwithstanding the foregoing, the Exercise Price shall be one dollar per share
if early exercise pursuant to Paragraph 2 occurs prior to August 2, 2000.

           b.  The Option shall be exercisable (i) as to one third of Option
Shares on August 2, 2000 (ii) up to two thirds of such share on January 1, 2001
and (iii) all such shares on January 1, 2002 or sooner as provided herein.

           c.  The Option Shares shall include additional shares ("Additional
Shares") as shall equal the Differential Number as calculated below:

               (i)  As used herein ("Base Number") shall be 1,686,383 plus any
Additional Shares acquired upon exercise of this Option.

<PAGE>

               (ii)  As used  herein  "Differential  Number"  shall refer to
the difference  between nine and nine tenths (9.9%) percent of the outstanding
shares of the Company on any given date and the Base Number.

           d.  The Option shall expire at 6:00 P.M. (E.S.T.) on January 21,
2005.

      2.   Exercise After Services/Early Exercise. Notwithstanding the
foregoing this Option may be exerciseable by Optionee or his estate even if he
is no longer employed by the Company unless his services were terminated for
cause. The Option shall immediately become exercisable on the date of any
termination of employment or upon completion of any transaction or series of
transactions in which an unaffiliated third party acquires a majority of the
shares of the Company or which the Company or an affiliate is not the survivor
or in which the Company's operating assets are transferred to an unaffiliated
third party. In such event this option shall be exercisable during the five year
period thereafter for the Option Shares.

      3.   No Rights as a Shareholder. The Optionee shall have no rights as a
holder of the Option Shares subject to the Option until such shares shall be
issued to him upon the exercise of the Option.

      4.   Non-Assignability of Option. Except as the Board of Directors may
determine, the Option shall not be transferable otherwise than by will or the
laws of descent and distribution, and the Option shall be exercisable, during
the lifetime of the Optionee, only by the Optionee. More particularly (but
without limiting the generality of the foregoing), the Option may not be
assigned, transferred (except as aforesaid), pledged or hypothecated in any way
(whether by operation of law or otherwise), and shall not be subject to
execution, attachment or similar process. Any attempted assignment, transfer,
pledge, hypothecation or other disposition of the Option contrary to the
provisions hereof, and the levy of any execution, attachment or similar process
upon the Option, shall be null and void and without effect.

      5.   Adjustments Upon Changes in Capitalization.

           a.  In the event that prior to the exercise of the Option in full,
the outstanding Common Stock is changed by reason or reorganization, merger,
consolidation, recapitalization, reclassification, stock split-up, combination
of shares, stock dividends or the like, an appropriate adjustment shall be made
by the Board of Directors in the aggregate number of shares available under this
Option and in the number of shares and exercise price subject to this Option. If
the Company shall be reorganized, consolidated or merged with another
corporation, or if all or substantially all of the assets of the Company shall
be sold or exchanged, the holder of an Option shall, at the time of issuance of
the stock under such a corporate event, be entitled to receive upon the exercise
of his Option the same number and kind of shares of stock or the same amount of
property, cash or securities as he would have been, immediately prior to such
event.

                                       2
<PAGE>

           b.  Any adjustment in the number of shares shall apply
proportionately to only the unexercised portion of the Option granted hereunder.
If fractions of a share would result from any such adjustment, the adjustment
shall be revised to the next lower whole number of shares.

      6.   Method of Exercise of Option. Subject to the terms and conditions of
this Agreement and such other method of the exercise as the Board of Directors
may agree upon, the Option may be exercised by written notice to the Company at
its principal office, presently located at One Penn Plaza, New York, New York
10119, attention of the Company's Secretary. Such notice shall state the
election to exercise the Option and the number of Common Shares in respect of
which it is being exercised, shall be signed by the person or persons so
exercising the Option and shall either be accompanied by payment in full, by
check payable to the order of the Company in the amount of the purchase price of
said shares in which event the Company shall, subject to the provisions of
paragraph 11, deliver a certificate or certificates representing said shares.

      7.   Restrictions on Issuance.

           a.  Unless prior to the exercise of the Option the Common Stocks
issuable upon such exercise have been registered with the Securities and
Exchange Commission pursuant to the Securities Act of 1933, as amended, the
notice of exercise shall be accompanied by a representation or agreement of the
individual exercising the Option to the Company to the effect that such shares
are being acquired for investment and not with a view to the resale or
distribution thereof or such other documentation as may be required by the
Company, unless in the opinion of counsel to the Company, such representation,
agreement or documentation is not necessary to comply with said Act.

           b.  The Company shall not be obligated to issue and deliver any
Common Shares until they have been listed on each securities exchange on which
Common Shares may then be listed nor until there has been qualification under or
compliance with such state or federal laws, rules or regulations as the Company
may deem applicable. The Company shall use reasonable efforts to obtain such
listing, qualification and compliance.

           c.  Notwithstanding the foregoing, the Option Shares shall be
included in a registration statement to be filed by the Company.

           8.  Company Obligations. The Company shall at all times during the
term of the Option reserve and keep available such number of Common Shares as
will be sufficient to satisfy the requirements of this Agreement, shall pay all
original issue and/or transfer taxes with respect to the issue and/or transfer
of shares by the Company pursuant hereto and all other fees and expenses
necessarily incurred by the Company in connection therewith and will from time
to time use its best efforts to comply with all laws and regulations which in
the opinion of counsel for the Company shall be applicable thereto.

                                       3
<PAGE>

           9.  No Contract of Employment. The execution of this Agreement shall
not be deemed to be a contract of employment or a grant of any right to any
employee optionee to remain in the employ of the Company or any subsidiary.

           10. Governing Law. This Option Agreement shall be construed in
accordance with and governed by the laws of the State of New York.

      IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
executed by its officers hereunto duly authorized, and the Optionee has hereunto
set his hand and seal, all on the day and year first above written.

                                    TELTRAN INTERNATIONAL GROUP, LTD.

                                    By:
                                       -----------------------------------

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

                                       ------------------------, President

AGREED TO AND ACCEPTED:

-----------------------------------
[Type below line name], Optionee

                                       4

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