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                                                                    Exhibit 10.1

                              SONUS NETWORKS, INC.
           NOTICE OF GRANT OF STOCK OPTIONS AND STOCK OPTION AGREEMENT
                       UNDER THE 1997 STOCK INCENTIVE PLAN

                         ADDITIONAL TERMS AND CONDITIONS

     1.   RELATIONSHIP TO PLAN. The Option is granted pursuant to the Company's
1997 Stock Incentive Plan, as amended (the "Plan"), and is in all respects
subject to the terms and conditions of the Plan, a copy of which has been
provided to the Optionee (the receipt of which the Optionee hereby
acknowledges). Capitalized terms used and not otherwise defined in this
Agreement are used as defined in the Plan. The Optionee hereby accepts the
Option subject to all the terms and provisions of the Plan. The Optionee further
agrees that all decisions under and interpretations of the Plan by the Company
will be final, binding, and conclusive upon the Optionee and his or her
successors, permitted assigns, heirs, and legal representatives.

     2.   VESTING. The Option will vest as follows, provided in each case that
the Optionee continues his or her employment with the Company or a subsidiary
thereof on the applicable vesting date:

          a.   NEW HIRE OPTION GRANT. The option will vest and become
               exercisable (i) with respect to 25% of the Shares on the first
               anniversary of the date that Optionee's employment with the
               Company commences ("Employment Date") and, (ii) with respect to
               the remaining 75% of the Shares, equal increments of 2.0833% of
               the Shares shall vest monthly thereafter through the fourth
               anniversary of the Employment Date;

          b.   REFERRAL GRANT. Options granted in connection with the Company's
               employee referral programs shall vest upon ninety (90) days of
               employment with the Company by the referred employee.

          c.   ALL OTHER OPTION GRANTS. All other Options granted by the Company
               shall vest and become exercisable (i) with respect to 25% of the
               Shares on the first anniversary of the Grant Date (as defined in
               the Notice of Grant of Stock Options and Option Agreement) and,
               (ii) with respect to the remaining 75% of the Shares, equal
               increments of 2.0833% of the Shares shall vest monthly thereafter
               through the fourth anniversary of the Grant Date.

A grant to a non-employee Director of the Company shall vest until the effective
date of such Director's resignation or removal from the Board of Directors of
the Company.

     3.   TERMINATION OF OPTION. The Option will terminate on the earlier of
(a) the tenth anniversary of the Grant Date (or the fifth anniversary of the
Grant Date, if the Optionee is a Ten Percent Owner), and (b) if the Optionee's
employment relationship with the Company terminates for any reason, the
applicable date determined from the following table:

<Table>
<Caption>
              REASON FOR TERMINATION             OPTION TERMINATION DATE
              ----------------------             -----------------------
     <S>      <C>                                <C>
     (i)      death of Optionee                  180 days thereafter

     (ii)     total and permanent                180 days thereafter
              disability of Optionee
              (as defined in Section
              22(e)(3) of the Internal
              Revenue Code of 1986,
              as amended)

     (iii)    termination for any                30 days  thereafter
              other reason
</Table>

Military or sick leave or other bona fide leave will not be deemed a termination
of the Optionee's employment relationship with the Company provided that it does
not exceed the longer of 90 days or the period during which the

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Stock Option Agreement, cont.

absent Optionee's re-employment rights are guaranteed by statute or by contract.

     4.   METHODS OF EXERCISE. Except as may otherwise be agreed by the Optionee
and the Company, the Option will be exercisable only by a written notice in form
and substance acceptable to the Company, specifying the number of shares to be
purchased and accompanied by payment in cash, by certified or bank check or as
otherwise permitted by the Plan, of the aggregate purchase price for the shares
for which the Option is being exercised.

     5.   PARTIAL EXERCISE. Until this Option terminates, you may exercise it
as to the number of vested option shares, determined in accordance with Section
2 above and as identified in the table set forth in the Notice of Stock Option
Grant and Stock Option Agreement, in full or in part, and from time to time,
except that this Option may not be exercised for a fraction of a share unless
such exercise is with respect to the final installment of stock subject to this
Option and a fractional share (or cash in lieu thereof) must be issued to permit
the Optionee to exercise completely such final installment. Any fractional share
with respect to which an installment of this Option cannot be exercised because
of the limitation contained in the preceding sentence shall remain subject to
this Option and shall be available for later purchase by the Optionee in
accordance with the terms hereof.

     6.   CHARACTERIZATION OF OPTION FOR TAX PURPOSES; OTHER OPTIONS. Although
the Option is intended to qualify as an "incentive stock option" under Section
422 of the Internal Revenue Code of 1986, as amended (the "Code"), the Company
makes no representation or warranty as to the tax treatment to the Optionee upon
receipt or exercise of the Option or sale or other disposition of the shares
covered by the Option. In addition, options granted to the Optionee under the
Plan and any and all other plans of the Company and its affiliates will not be
treated as incentive stock options for tax purposes to the extent that options
covering in excess of $100,000 of stock (based upon fair market value of the
stock as of the respective dates of grant of such options) become exercisable in
any calendar year; and such options will be subject to different tax treatment.
This Option is in addition to any other options heretofore or hereafter granted
to the Optionee by the Company, but a duplicate original of this instrument
shall not effect the grant of another option.

     7.   NO OBLIGATION TO EXERCISE OPTION. The grant and acceptance of this
Option imposes no obligation on the Optionee to exercise it.

     8.   ADJUSTMENT PROVISIONS. In the event of an Acquisition (as defined
below), if this Option is assumed or substituted by the Acquiror (as defined
below), then the number of Shares that are not then vested shall become
accelerated in vesting by 12 months upon the closing of the Acquisition. If this
Option is not assumed or substituted by the Acquiror, then the number of shares
covered by this Option that are not then vested shall accelerate in full and
become immediately exercisable. The Company may in its discretion accelerate the
vesting schedule at any time. For the purposes of this Agreement, "Acquisition"
shall mean any (i) merger or consolidation which results in the voting
securities of the Company outstanding immediately prior thereto representing
immediately thereafter (either by remaining outstanding or by being converted
into voting securities of the surviving or acquiring entity (the "Acquiror"))
less than a majority of the combined voting power of the voting securities of
the Company or the Acquiror outstanding immediately after such merger or
consolidation, (ii) sale of all or substantially all the assets of the Company
or (iii) sale of shares of capital stock of the Company, in a single transaction
or series of related transactions, representing at least 80% of the voting power
of the voting securities of the Company.

     9.   NO OBLIGATION TO CONTINUE EMPLOYMENT. The Company and any related
corporation are not by the Plan or this Option obligated to continue the
Optionee's employment.

     10.  NO RIGHTS AS STOCKHOLDER UNTIL EXERCISE. The Optionee shall have no
rights as a stockholder with respect to shares subject to this Agreement until a
stock certificate therefor has been issued to the Optionee and is fully paid
for. Except as is expressly provided in the Plan with respect to certain changes
in the capitalization of the Company, no adjustment shall be made for dividends
or similar rights for which the record date is prior to the date such stock
certificate is issued.

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     11.  COMPLIANCE WITH LAWS. The obligations of the Company to sell and
deliver Shares upon exercise of the Option are subject to all applicable laws,
rules, and regulations, including all applicable federal and state securities
laws, and the obtaining of all such approvals by government agencies as may be
deemed necessary or appropriate by the Board of Directors ("Board") or the
relevant committee of the Board.

     12.  EARLY DISPOSITION. The Optionee agrees to notify the Company in
writing immediately after the Optionee makes a Disqualifying Disposition of any
Common Stock received pursuant to the exercise of this Option. A Disqualifying
Disposition is any disposition (including any sale) of such Common Stock before
the LATER of (a) two years after the date the Optionee was granted this option
or (b) one year after the date the Optionee acquired Common Stock by exercising
this option. If the Optionee has died before such stock is sold, these holding
period requirements do not apply and no Disqualifying Disposition can occur
thereafter. The Optionee also agrees to provide the Company with any information
which it shall request concerning any such disposition. The Optionee
acknowledges that he or she will forfeit the favorable income tax treatment
otherwise available with respect to the exercise of this incentive stock option
if he or she makes a Disqualifying Disposition of the stock received on exercise
of this option. The Optionee is urged to consult with his or her own individual
tax and legal advisors as to the impact upon the exercise of this option as well
as a subsequent Disqualifying Disposition.

     13.  WITHHOLDING TAXES. If the Company in its discretion determines that it
is obligated to withhold tax with respect to a Disqualifying Disposition (as
defined in Section 12 of this Agreement) of Common Stock received by the
Optionee on exercise of this Option, the Optionee hereby agrees that the Company
may withhold from the Optionee's wages the appropriate amount of federal, state,
and local withholding taxes attributable to such Disqualifying Disposition. If
any portion of this Option is treated as a Nonstatutory option, the Optionee
hereby agrees that the Company may withhold from the Optionee's wages the
appropriate amount of federal, state, and local withholding taxes attributable
to the Optionee's exercise of such Nonstatutory Option. At the Company's
discretion, the amount required to be withheld may be withheld in cash from such
wages, paid by Optionee directly, or (with respect to compensation income
attributable to the exercise of this Option) in kind from the Common Stock
otherwise deliverable to the Optionee on exercise of this Option. The Optionee
further agrees that, if the Company does not withhold an amount from the
Optionee's wages sufficient to satisfy the Company's withholding obligation, the
Optionee will reimburse the Company on demand, in cash, for the amount under
withheld.

     14.  UNREGISTERED SHARES. If, at any time, the shares of Common Stock to be
issued upon exercise of this Option (the "Shares") are not effectively
registered under the Securities Act of 1933, as amended (the "Securities Act"),
then:

          (a) REGISTRATION. The Optionee agrees that if the Company at any time,
or from time to time, deems it necessary or desirable to make any registered
public offering(s) of shares of Common Stock, then, without the prior written
consent of the Company, the Optionee will not sell, make any short sale of,
loan, grant any option for the purchase of, pledge or otherwise encumber, or
otherwise dispose of, any shares of Common Stock during the 180 day period
commencing on the effective date of the registration statement relating to such
registered public offering(s) of shares of Common Stock.

          (b) INVESTMENT REPRESENTATIONS. The Optionee hereby represents,
warrants and covenants that upon Optionee's future exercise, in whole or in
part, of this Option: (i) the Optionee is purchasing the Shares for his/her own
account for investment only, and not with a view to, or for sale in connection
with, any distribution of the Shares in violation of the Securities Act, or any
rule or regulation under the Securities Act; (ii) the Optionee has had such
opportunity, as he/she has deemed adequate to obtain from representatives of the
Company such information as is necessary to permit him/her to evaluate the
merits and risks of his/her investment in the Company; (iii) the Optionee has
sufficient experience in business, financial and investment matters to be able
to evaluate the risks involved in the purchase of the Shares and to make an
informed investment decision with respect to such purchase; (iv) the Optionee
can afford a complete loss of the value of the Shares and is able to bear the
economic risk of holding such Shares for an indefinite period; (v) the Optionee
understands that (a) the Shares have not been registered under the Securities
Act and are "restricted securities" within the meaning of Rule 144 under the

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Securities Act, (b) the Shares cannot be sold, transferred or otherwise disposed
of unless they are subsequently registered under the Securities Act or an
exemption from registration is then available; (c) in any event, the exemption
from registration under Rule 144 will not be available for at least one year and
even then will not be available unless a public market then exists for the
Common Stock, adequate information concerning the Company is then available to
the public, and other terms and conditions of Rule 144 are complied with; and
(d) there is no registration statement on file with the Securities and Exchange
Commission with respect to any stock of the Company and the Company has no
obligation or current intention to register the Shares under the Securities Act.

          By making payment upon any exercise of this Option, in whole or in
part, the Optionee shall be deemed to have reaffirmed, as of the date of such
payment, the representations made in this Section 14.

          (c)  LEGEND ON SHARES. The Optionee acknowledges that a legend
substantially in the following form will be placed on any certificates
representing the Shares:

          "The shares represented by this certificate have not been registered
          under the Securities Act of 1933, as amended, and may not be sold,
          transferred or otherwise disposed of in the absence of an effective
          registration statement under such Act or an opinion of counsel
          satisfactory to the corporation to the effect that such registration
          is not required."

     15.  GENERAL. This Option may not be transferred except by will or the laws
of descent and distribution and, during the lifetime of the Optionee, may be
exercised only by the Optionee. This Agreement will be governed by and
interpreted and construed in accordance with the internal laws of the State of
Delaware (without reference to principles of conflicts or choice of law). The
captions of the sections of this Agreement are for reference only and will not
affect the interpretation or construction of this Agreement. This Agreement will
bind and inure to the benefit of the parties and their respective successors,
permitted assigns, heirs, devisees, and legal representatives. This Agreement
supersedes all prior agreements, written or oral, between the Optionee and the
Company relating to the subject matter of this Agreement.

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                                                                    Exhibit 10.2

                              SONUS NETWORKS, INC.
                               INDEMNITY AGREEMENT

       This Indemnity Agreement (this "Agreement") is made and entered into
effective as of the ___ day of ______, 2003, by and between Sonus Networks,
Inc., a Delaware corporation (the "Corporation"), and _______________ (the
"Indemnitee"), a director and/or officer of the Corporation.

       WHEREAS, it is essential to the Corporation to retain and attract as
directors and/or officers the most capable persons available;

       WHEREAS, the possibility of corporate litigation subjects directors and
officers to expensive litigation risks at the same time that the availability of
directors' and officers' liability insurance is limited;

       WHEREAS, the Corporation has agreed to indemnify its Directors and
officers so as to provide them with the maximum possible protection permitted by
law; and

       WHEREAS, because the statutory indemnification provisions of the General
Corporation Law of the State of Delaware, Section 145, expressly provide that
they are non-exclusive, the Corporation is willing to agree to indemnify
directors and officers who have entered into settlements of derivative suits or
have paid judgments, fines or penalties therefor, provided they have not
breached the applicable statutory standard of conduct; and

       WHEREAS, the General Corporation Law of the State of Delaware, Section
145, and the Corporation's Certificate of Incorporation and/or By-laws provide
that indemnification of the Directors and officers of the Corporation may be
authorized by agreement, and thereby contemplates that contracts of this nature
may be entered into between the Corporation and the Indemnitee with respect to
indemnification of the Indemnitee as a director and/or officer of the
Corporation.

       NOW, THEREFORE, for good and valuable consideration, the sufficiency and
adequacy of which is hereby acknowledged, the Corporation and the Indemnitee do
hereby agree as follows:

       1. AGREEMENT TO SERVE. The Indemnitee agrees to serve or continue to
serve as Director and/or officer of the Corporation for so long as he is duly
elected or appointed or until such time as he tenders his resignation in writing
or is otherwise terminated or removed from office.

       2. DEFINITIONS. As used in this Agreement:

            (a) The term "Proceeding" shall include any threatened, pending or
completed action, suit, arbitration, administrative hearing or other proceeding,
whether brought by or in the right of the Corporation or otherwise, whether
brought while the Indemnitee is acting or serving as a Director and/or officer
of the Corporation or subsequent to the Indemnitee serving in such capacity, and
whether of a civil, criminal, administrative or investigative nature, and any
appeal therefrom, in which the Indemnitee and/or the Corporation may be or may
have been involved as a party or otherwise, (i) by reason of the status of the
Indemnitee as a director and/or officer of the Corporation or as a director,
partner, trustee, officer, employee or agent of another corporation, domestic or
foreign, non-profit or for-profit, partnership, joint venture, trust or other
enterprise at the request of the Corporation ("Corporate Status"),

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or (ii) by reason of any action alleged to have been taken by him or of any
alleged inaction on his part in such Corporate Status.

            (b) The term "Expenses" shall include, without limitation,
attorneys' fees, retainers, court costs, transcript costs, fees and expenses of
experts, travel expenses, duplicating costs, printing and binding costs,
telephone charges, postage, delivery service fees and other disbursements or
expenses of the types customarily incurred in connection with investigations,
judicial or administrative proceedings or appeals, and any expenses of
establishing a right to indemnification under Paragraph 9 of this Agreement, in
each case to the extent actually and reasonably incurred by a person. The term
"Expenses" shall not include the amount of judgments, fines or penalties against
Indemnitee or amounts paid in settlement in connection with such matters.

            (c) References to "other enterprise" shall include, without
limitation, employee benefit plans; references to "fines" shall include, without
limitation, any excise tax assessed with respect to any employee benefit plan;
references to "serving at the request of the Corporation" shall include, without
limitation, any service as a director and/or officer of the Corporation which
imposes duties on, or involves services by, such director and/or officer with
respect to an employee benefit plan, its participants or beneficiaries; and a
person who acted in good faith and in a manner he or she reasonably believed to
be in the best interests of the participants and beneficiaries of an employee
benefit plan shall be deemed to have acted in a manner "not opposed to be best
interests of the Corporation" as referred to in this Agreement.

       3. PROCEEDINGS OTHER THAN BY OR IN THE RIGHT OF THE CORPORATION. The
Corporation shall indemnify the Indemnitee in accordance with the provisions of
this Agreement if the Indemnitee was or is a party to or threatened to be made a
party to or otherwise involved in any Proceeding (other than a Proceeding by or
in the right of the Corporation), by reason of the Indemnitee's Corporate Status
or by reason of any action alleged to have been taken or omitted in such
capacity, against all Expenses, judgments, fines, penalties and amounts paid in
settlement actually and reasonably incurred by him or it on his or its behalf in
connection with such Proceeding, if the Indemnitee acted in good faith and in a
manner he or it reasonably believed to be in, or not opposed to, the best
interests of the Corporation, and, with respect to any criminal Proceeding, had
no reasonable cause to believe his or its conduct was unlawful, provided, that,
in no event shall the Indemnitee be entitled to indemnification hereunder to the
extent that such indemnification is prohibited by the General Corporation Law of
the State of Delaware. The termination of Proceeding by judgment, order,
settlement, conviction or upon a plea of NOLO CONTENDERE or its equivalent,
shall not, of itself, create a presumption that the Indemnitee did not act in
good faith and in a manner which he or it reasonably believed to be in, or not
opposed to, the best interests of the Corporation, and, with respect to any
criminal Proceeding, had reasonable cause to believe that his or its conduct was
unlawful. Notwithstanding anything to the contrary in this Paragraph, except as
set forth in Paragraph 9 below, the Corporation shall not indemnify the
Indemnitee in connection with a Proceeding (or part thereof) initiated by the
Indemnitee, as the case may be, unless the initiation thereof was approved by
the Board of Directors of the Corporation.

       4. PROCEEDINGS BY OR IN THE RIGHT OF THE CORPORATION. The Corporation
shall indemnify the Indemnitee in accordance with the provisions of this
Agreement if the Indemnitee was or was or is a party to or threatened to be made
a party to or otherwise involved in any Proceeding by or in the right of the
Corporation to procure a judgment in its favor by reason of the Indemnitee's
Corporate Status or by

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reason of any action alleged to have been taken or omitted in such capacity,
against all Expenses and, to the extent permitted by law, amounts paid in
settlement actually and reasonably incurred by him or it or on his or its behalf
in connection with such Proceeding, if the Indemnitee acted in good faith and in
a manner he reasonably believed to be in, or not opposed to, the best interests
of the Corporation, except that no indemnification shall be made in respect of
any claim, issue or matter as to which the Indemnitee shall have been adjudged
to be liable to the Corporation unless and only to the extent that the Court of
Chancery of Delaware or the court in which such Proceeding was brought shall
determine upon application that, despite the adjudication of such liability but
in view of all the circumstances of the case, the Indemnitee is fairly and
reasonably entitled to indemnity for such Expenses which the Court of Chancery
of Delaware or such other court shall deem proper.

       5. COSTS AND EXPENSES RELATING TO SERVICE AS A WITNESS. The Corporation
shall indemnify the Indemnitee in accordance with the provisions of this
Agreement with respect to all Expenses incurred or suffered by the Indemnitee as
a result of the service, attendance or appearance by the Indemnitee as a witness
(or in any other non-party capacity) in any Proceeding (including any part of a
Proceeding such as appearance at a hearing, deposition or trial or any actions
taken in response to any subpoena, order, discovery request or the like) if such
service, attendance or appearance relates to or results from the Indemnitee's
Corporate Status or by reason of any action alleged to have been taken or
omitted in such capacity.

       6. INDEMNIFICATION FOR EXPENSES OF SUCCESSFUL PARTY. Notwithstanding
the other provisions of this Agreement, to the extent that the Indemnitee has
been successful, on the merits or otherwise, in defense of any Proceeding, or in
defense of any claim, issue or matter therein, he shall be indemnified against
Expenses actually and reasonably incurred by him or it or on his or its behalf
in connection therewith. Without limiting the foregoing, if any Proceeding or
any claim, issue or matter therein is disposed of, on the merits or otherwise
(including a disposition without prejudice), without (i) the disposition being
adverse to the Indemnitee, (ii) an adjudication that the Indemnitee was liable
to the Corporation, (iii) a plea of guilty or nolo contendere by the Indemnitee,
(iv) an adjudication that the Indemnitee did not act in good faith and in a
manner the Indemnitee reasonably believed to be in or not opposed to the best
interests of the Corporation, and (v) with respect to any criminal Proceeding,
an adjudication that the Indemnitee had reasonable cause to believe his conduct
was unlawful, the Indemnitee shall be considered for the purposes hereof to have
been wholly successful with respect thereto.

       7. NOTIFICATIONS AND DEFENSE OF CLAIM. As a condition precedent to his or
its right to be indemnified, the Indemnitee must notify the Corporation in
writing as soon as practicable of any Proceeding for which indemnity will or
could be sought. With respect to any Proceeding of which the Corporation is so
notified, the Corporation will be entitled to participate therein at its own
expense and/or to assume the defense thereof at its own expense, with legal
counsel reasonably acceptable to the Indemnitee. After notice from the
Corporation to the Indemnitee of its election to assume such defense, the
Corporation shall not be liable to the Indemnitee for any Expenses subsequently
incurred by the Indemnitee in connection with such Proceeding, other than as
provided below in this Paragraph 7. The Indemnitee shall have the right to
employ his or its own counsel in connection with such Proceeding, but the
Expenses of such counsel incurred after notice from the Corporation of its
assumption of the defense thereof shall be at the expense of the Indemnitee
unless (i) the employment of counsel by the Indemnitee has been authorized by
the Corporation, (ii) counsel to the Indemnitee and to the Corporation shall
have

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reasonably concluded that there may be a conflict of interest or position on any
significant issue between the Corporation and the Indemnitee in the conduct of
the defense of such Proceeding or (iii) the Corporation shall not in fact have
employed counsel to assume the defense of such Proceeding, in each of which
cases the Expenses of counsel for the Indemnitee shall be at the expense of the
Corporation, except as otherwise expressly provided by this Agreement. The
Corporation shall not be entitled, without the prior written consent of the
Indemnitee, to assume the defense of any Proceeding brought by or in the right
of the Corporation or as to which counsel for the Indemnitee shall have
reasonably made the conclusion provided for in clause (ii) above. The
Corporation shall not be required to indemnify the Indemnitee under this
Agreement for any amounts paid in settlement of any Proceeding affected without
its written consent. The Corporation shall not settle any Proceeding in any
manner that would impose any penalty or limitation on the Indemnitee without the
Indemnitee's written consent. Neither the Corporation nor the Indemnitee will
unreasonably withhold or delay its consent to any proposed settlement.

       8. ADVANCE OF EXPENSES. Subject to the provisions of Paragraph 9 below,
in the event that the Corporation does not assume the defense pursuant to
Paragraph 9 of this Agreement of any Proceeding of which the Corporation
receives notice under this Agreement, any Expenses incurred by or on behalf of
the Indemnitee in connection with any such Proceeding shall be paid by the
Corporation in advance of the final disposition of such Proceeding, PROVIDED,
HOWEVER, that the payment of such Expenses incurred by or on behalf of the
Indemnitee in advance of the final disposition of such Proceeding shall be made
only upon receipt of an undertaking by or on behalf of the Indemnitee to repay
all amounts so advanced in the event that it shall ultimately be determined that
the Indemnitee is not entitled to be indemnified by the Corporation as
authorized in this Agreement. Such undertaking shall be accepted without
reference to the financial ability of the Indemnitee to make repayment.

       9. PROCEDURE FOR INDEMNIFICATION. Any indemnification or advancement of
Expenses pursuant to Paragraphs 3, 4, 6, or 8 of this Agreement shall be made
promptly, and in any event within 60 days after receipt by the Corporation of
the written request of the Indemnitee unless with respect to requests under
Paragraphs 3, 4 or 8 the Corporation determines within such 60-day period that
the Indemnitee did not meet the applicable standard of conduct set forth in
Paragraph 3 or 4, as the case may be. Such determination shall be made in each
instance by (a) a majority vote of the directors of the Corporation consisting
of persons who are not at that time parties to the Proceeding in question
("DISINTERESTED DIRECTORS"), (b) a committee of two or more Disinterested
Directors designated by a majority vote of the Disinterested Directors, (c) if
there are no Disinterested Directors or if appointed by a majority vote of the
Disinterested Directors, independent legal counsel (who may be regular legal
counsel to the Corporation) or (d) by a majority vote of the stockholders of the
Corporation. The right to indemnification or advances of Expenses as granted by
this Agreement shall be enforceable by the Indemnitee in any court of competent
jurisdiction if the Corporation denies such request, in whole or in part, or if
no disposition thereof is made within the 60-day period referred to above. The
Indemnitee's Expenses incurred in connection with successfully establishing his
or its right to indemnification, in whole or in part, in any such Proceeding
shall also be indemnified by the Corporation. Unless otherwise provided by law,
the burden of proving that the Indemnitee is not entitled to indemnification or
advancement of Expenses under this Agreement shall be on the Corporation.

         10. OTHER RIGHTS. The indemnification and advancement of Expenses
provided by this Agreement shall not be deemed exclusive of any other rights to
which the Indemnitee may be entitled

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under the Certificate of Incorporation of the Corporation, as amended and/or
restated from time to time, the By-laws of the Corporation, as amended and/or
restated from time to time, the General Corporation Law of the State of
Delaware, any other law (common or statutory), and other agreement or any vote
of stockholders or Disinterested Directors, or otherwise, both as to action in
the Indemnitee's official capacity and as to action in any other capacity while
holding office for the Corporation, and shall continue as to the Indemnitee even
though the Indemnitee shall have ceased to be a director or officer, and shall
inure to the benefit of the estate, heirs, executors and administrators of the
Indemnitee.

       11. PARTIAL INDEMNIFICATION. If the Indemnitee is entitled under any
provision of this Agreement to indemnification by the Corporation for some or a
portion of the Expenses, judgments, fines, penalties or amounts paid in
settlement actually and reasonably incurred by him or it or on his or its behalf
in connection with any Proceeding but not, however, for the total amount
thereof, the Corporation shall nevertheless indemnify the Indemnitee for the
portion of such Expenses, judgments, fines, penalties or amounts paid in
settlement to which the Indemnitee is entitled.

       12. ALLOWANCE FOR COMPLIANCE WITH SEC REQUIREMENTS. The Indemnitee
acknowledges that the Securities and Exchange Commission ("SEC") has expressed
the opinion that indemnification of directors and officers for liabilities under
the Securities Act of 1933 ("ACT") is against public policy as expressed in the
Act and is, therefore, unenforceable. The Indemnitee each hereby acknowledge and
agree that it will not be a breach of this Agreement for the Corporation to
undertake with the SEC in connection with the registration for sale of any
shares or other securities of the Corporation from time to time that, in the
event a claim for indemnification against such liabilities (other than the
payment by the Corporation of expenses incurred or paid by a director or officer
of the Corporation in the successful defense of any Proceeding) is asserted in
connection with such shares or other securities being registered, the
Corporation will, unless in the opinion of its counsel the matter has been
settled by controlling precedent, submit to a court of competent jurisdiction on
the question of whether or not such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue. The Indemnitee further agree that such submission to a court of
competent jurisdiction shall not be a breach of this Agreement.

       13. REIMBURSEMENT TO CORPORATION BY INDEMNITEE; LIMITATION ON AMOUNTS
PAID BY CORPORATION. To the extent the Indemnitee has been indemnified by the
Corporation hereunder and later receives payments from any insurance carrier
covering the same Expenses, judgments, fines, penalties, or amounts paid in
settlement so indemnified by the Corporation hereunder, the Indemnitee shall
immediately reimburse the Corporation hereunder for all such amounts received
from the insurer.

       Notwithstanding anything contained herein to the contrary, the Indemnitee
shall not be entitled to recover amounts under this Agreement which, when added
to the amount of any insurance proceeds or indemnification payments made to, or
on behalf of, the Indemnitee under the Certificate of Incorporation or By-laws
of the Corporation, in the aggregate exceed the expenses, judgments, fines,
penalties and amounts paid in settlement actually and reasonably incurred by the
Indemnitee ("EXCESS AMOUNTS"). To the extent the Corporation or any insurance
carrier has paid Excess Amounts to the Indemnitee the Indemnitee shall be
obligated to immediately reimburse the Corporation for such Excess Amounts.

       14. CONTINUATION OF RIGHTS AND OBLIGATIONS. All rights and obligations of
the Corporation, the Indemnitee hereunder shall continue in full force and
effect despite the subsequent amendment or

                                       5

<Page>

modification of the Corporation's Certificate of Incorporation or By-laws, as
such are in effect on the date hereof, and such rights and obligations shall not
be affected by any such amendment or modification, any resolution of directors
or stockholders of the Corporation, or by any other corporate action which
conflicts with or purports to amend, modify, limit or eliminate any of the
rights or obligations of the Corporation, the Indemnitee hereunder.

       15. ASSIGNMENT. This Agreement shall not be assigned by the
Corporation, the Indemnitee without the prior written consent of the other
parties hereto, except that the Corporation may freely assign its rights and
obligations under this Agreement to any subsidiary for whom the Indemnitee is
serving as a director and/or officer thereof; provided, however, that no
permitted assignment shall release the assignor from its obligations hereunder.
Subject to the foregoing, this Agreement and all of the provisions hereof shall
be binding upon and inure to the benefit of the parties hereto and their
respective heirs, executors, successors and assigns, including, without
limitation, any successor to the Corporation by way of merger, consolidation
and/or sale or disposition of all or substantially all of the shares of the
Corporation.

       16. SAVING CLAUSE. If this Agreement or any portion thereof shall be
invalidated on any ground by any court of competent jurisdiction, the
Corporation shall nevertheless indemnify the Indemnitee as to Expenses,
judgments, fines, penalties and amounts paid in settlement with respect to any
proceeding to the full extent permitted by any applicable portion of this
Agreement that shall not have been invalidated or by any other applicable law.

       17. COUNTERPARTS. This Agreement may be executed in two or more fully or
partially executed counterparts each of which shall be deemed an original
binding the signer thereof against the other signing parties, but all
counterparts together shall constitute one and the same instrument. Executed
signature pages may be removed from counterpart agreements and attached to one
or more fully executed copies of this Agreement.

       18. GOVERNING LAW. This Agreement shall be governed by and construed and
enforced in accordance with, the laws of the State of Delaware. The Indemnitee
may elect to have the right to indemnification or reimbursement or advancement
of Expenses interpreted on the basis of the applicable law in effect at the time
of the occurrence of the event or events giving rise to the applicable
Proceeding, to the extent permitted by law, or on the basis of the applicable
law in effect at the time such indemnification or reimbursement or advancement
of Expenses is sought. Such election shall be made, by a notice in writing to
the Corporation, at the time indemnification or reimbursement or advancement of
Expenses is sought; provided, however, that if no such notice is given, and if
the General Corporation Law of Delaware is amended, or other Delaware law is
enacted, to permit further indemnification of the directors and officers, then
the Indemnitee shall be indemnified to the fullest extent permitted under the
General Corporation Law, as so amended, or by such other Delaware law, as so
enacted.

       19. NOTICES. Any and all notices or elections permitted or required to be
made under this Agreement shall be in writing, signed by the parties giving such
notice or election and shall be delivered personally, or sent by registered or
certified mail, return receipt requested, to the Company and the Indemnitee at
their respective addresses shown below.

       20. ENTIRE AGREEMENT. This Agreement constitutes the entire agreement of
the parties hereto

                                       6
<Page>

with respect to the subject matter contained herein and supersedes all prior
agreements whether oral or written by any officer, employee or representative of
any party hereto in respect of the subject matter contained herein; and any
prior agreement of the parties hereto in respect of the subject matter contained
herein is hereby terminated. For avoidance of doubt, the parties confirm that
the foregoing does not apply to or limit the Indemnitee's rights under Delaware
law or the Corporation's Certificate of Incorporation or By-Laws.

       21. MODIFICATION AND WAIVER. This Agreement may be amended from time to
time to reflect changes in Delaware law or for other reasons. No supplement,
modification or amendment of this Agreement shall be binding unless executed in
writing by both of the parties hereto. No waiver of any of the provisions of
this Agreement shall be deemed or shall constitute a waiver of any other
provision hereof nor shall any such waiver constitute a continuing waiver.

       22. ENFORCEMENT. The Corporation expressly confirms and agrees that it
has entered into this Agreement in order to induce the Indemnitee to continue to
serve as an officer or director of the Corporation, and acknowledges that the
Indemnitee is relying upon this Agreement in continuing in such capacity.

         23. PRONOUNS AND NOUNS. Whenever the context may require, any pronouns
used in this Agreement shall include the corresponding masculine, feminine or
neuter forms, and the singular forms of nouns and pronouns shall include the
pronouns shall include the plural and vice-versa.

       24. CAPTIONS. Captions of paragraphs have been added for convenience only
and shall not be deemed to be a part of this Agreement.

       IN WITNESS WHEREOF, the parties hereby have caused this Agreement to be
duly executed and signed effective as of the day and year first above written.

                                        SONUS NETWORKS, INC.

                                        By:
                                           -------------------------------------
                                        Name:
                                        Title:
                                        Address:
                                                 250 Apollo Drive
                                                 Chelmsford, MA  01824

                                        INDEMNITEE

                                        ----------------------------------------
                                        Name:
                                        Address:
                                                --------------------------------
                                                --------------------------------
                                                --------------------------------
                                                --------------------------------

                                       7

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