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                                                                    EXHIBIT 10.3

                                ACME PACKET, INC.

                 2000 AMENDED AND RESTATED EQUITY INCENTIVE PLAN

1.   PURPOSE

     This Plan is intended to encourage ownership of Common Stock by employees,
consultants and directors of the Company and its Affiliates and to provide
additional incentives for them to promote the success of the Company's business
through the grant of Awards of shares of the Company's Common Stock. The Plan is
intended to be an incentive stock option plan within the meaning of Section 422
of the Code but not all Awards granted hereunder are required to be Incentive
Options.

2.   DEFINITIONS

     As used in the Plan the following terms shall have the respective meanings
set out below, unless the context clearly requires otherwise:

     2.1. "ACCELERATE", "ACCELERATED", and "ACCELERATION", when used with
respect to an Option, means that as of the time of reference such Option will
become exercisable with respect to some or all of the shares of Common Stock for
which it was not then otherwise exercisable by its terms, and, when used with
respect to Restricted Stock, means that the Risk of Forfeiture otherwise
applicable to such Common Stock shall expire with respect to some or all of the
shares of Restricted Stock then still otherwise subject to the Risk of
Forfeiture.

     2.2. "ACQUIRING PERSON" means, with respect to any Transaction or any
acquisition described in clause (ii) of the definition of Change of Control, the
surviving or acquiring person or entity in connection with such Transaction or
acquisition, as the case may be, provided that if such surviving or acquiring
person or entity is controlled, directly or indirectly, by any other person or
entity (an "Ultimate Parent Entity") that is not itself controlled by any entity
or person that is not a natural person, the term "Acquiring Person" shall mean
such Ultimate Parent Entity.

     2.3. "AFFILIATE" means, with respect to any person or entity, any other
person or entity controlling, controlled by or under common control with the
first person or entity.

     2.4. "AWARD" means any grant or sale pursuant to the Plan of Options,
Restricted Stock, or Stock Grants.

     2.5. "AWARD AGREEMENT" means an agreement between the Company and the
recipient of an Award, setting forth the terms and conditions of the Award.

     2.6. "BENEFICIAL OWNERSHIP" has the meaning ascribed to such term in Rule
13d-3, or any successor rule thereto, promulgated by the Securities and Exchange
Commission pursuant to the Exchange Act.

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     2.7. "BOARD" means the Company's board of directors.

     2.8. "CHANGE OF CONTROL" means (i) the closing of any Sale of the Company
Transaction or (ii) the direct or indirect acquisition, in a single transaction
or a series of related transactions, by any person or Group (other than the
Company or a Controlled Affiliate of the Company) of Beneficial Ownership of
previously outstanding shares of capital stock of the Company if (A) immediately
after such acquisition, such person or Group, together with their respective
Affiliates, shall own or hold shares of capital stock of the Company possessing
at least twenty percent (20%) of the total voting power of the outstanding
capital stock of the Company and (B) immediately prior to such acquisition, such
person or Group, together with their respective Affiliates, did not own or hold
shares of capital stock of the Company possessing at least twenty percent (20%)
of the total voting power of the outstanding capital stock of the Company.
Notwithstanding anything expressed or implied in the foregoing provisions of
this definition to the contrary, any direct or indirect acquisition referred to
in clause (ii) above in this definition shall not be treated as a Change of
Control if, at any time prior to or after such direct or indirect acquisition, a
majority of the members of the Board of Directors of the Company as constituted
immediately prior to such direct or indirect acquisition consent in writing to
exclude such direct or indirect acquisition from the scope of this definition.

     2.9. "CODE" means the Internal Revenue Code of 1986, as amended from time
to time, or any successor statute thereto, and any regulations issued from time
to time thereunder.

     2.10. "CONTROLLED AFFILIATE" means, with respect to any person or entity,
any other person or entity that is controlled by such person or entity.

     2.11. "COMMITTEE" means any committee of the Board delegated responsibility
by the Board for the administration of the Plan, as provided in Section 5 of the
Plan. For any period during which no such committee is in existence, the term
"COMMITTEE" shall mean the Board and all authority and responsibility assigned
the Committee under the Plan shall be exercised, if at all, by the Board.

     2.12. "COMMON STOCK" means common stock, par value $0.001 per share, of the
Company.

     2.13. "COMPANY" means Acme Packet, Inc., a corporation organized under the
laws of the State of Delaware.

     2.14. "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

     2.15. "GRANT DATE" means the date as of which an Option is granted, as
determined under Section 7.1(a).

     2.16. "GROUP" has the meaning ascribed to such term in Section 13(d)(3) of
the Exchange Act or any successor section thereto.

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     2.17. "INCENTIVE OPTION" means an Option which by its terms is to be
treated as an "incentive stock option" within the meaning of Section 422 of the
Code.

     2.18. "MARKET VALUE" means the value of a share of Common Stock on a
particular date determined by such methods or procedures as may be established
by the Committee. Unless otherwise determined by the Committee, the Market Value
of Common Stock as of any date is the closing price for the Common Stock as
reported on the NASDAQ Global Market (or on any other national securities
exchange on which the Common Stock is then listed) for that date or, if no
closing price is reported for that date, the closing price on the next preceding
date for which a closing price was reported.

     2.19 "NONSTATUTORY OPTION" means any Option that is not an Incentive
Option.

     2.20 "OPTION" means an option granted under the Plan to purchase shares of
Common Stock.

     2.21 "OPTIONEE" means an employee, consultant or director of the Company to
whom an Option shall have been initially granted under the Plan.

     2.22 "PARTICIPANT" means any holder of an outstanding Award under the Plan.

     2.23 "PLAN" means this 2000 Amended and Restated Equity Incentive Plan of
the Company, as amended and in effect from time to time.

     2.24 "RESTRICTED STOCK" means a grant or sale pursuant to the Plan of
shares of Common Stock to an employee, consultant or director of the Company
subject to a Risk of Forfeiture.

     2.25 "RESTRICTION PERIOD" means the period of time, established by the
Committee in connection with an Award of Restricted Stock, during which such
shares of Restricted Stock are subject to a Risk of Forfeiture described in the
applicable Award Agreement.

     2.26 "RISK OF FORFEITURE" means a limitation on the right of a Participant
to retain an Award of Restricted Stock, including a right in the Company to
reacquire such Restricted Stock at less than its then Market Value, arising
because of the occurrence or non-occurrence of specified events or conditions.

     2.27 "SALE OF THE COMPANY TRANSACTION" means any Transaction in which the
stockholders of the Company immediately prior to such Transaction, together with
any and all of such stockholders' Affiliates, do not own or hold, immediately
after consummation of such Transaction, shares of capital stock of the Acquiring
Person in connection with such Transaction possessing at least a majority of the
total voting power of the outstanding capital stock of such Acquiring Person

     2.28 "SECURITIES ACT" means the Securities Act of 1933, as amended.

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     2.29 "STOCK GRANT" means the grant pursuant to the Plan of shares of Common
Stock not subject to restrictions or other forfeiture conditions.

     2.30 "TEN PERCENT OWNER" means a person who owns, or is deemed within the
meaning of Section 422(b)(6) of the Code to own, stock possessing more than 10%
of the total combined voting power of all classes of stock of the Company (or
any parent or subsidiary corporations of the Company, as defined in Section
424(e) and (f), respectively, of the Code). Whether a person is a Ten Percent
Owner shall be determined with respect to each Option based on the facts
existing immediately prior to the Grant Date of such Option.

     2.31 "TRANSACTION" means any merger or consolidation of the Company with or
into another person or entity or the sale or transfer of all or substantially
all of the assets of the Company, in each case in a single transaction or in a
series of related transactions

3.   TERM OF THE PLAN

     Unless the Plan shall have been earlier terminated by the Board, Awards may
be granted under this Plan at any time in the period commencing on the effective
date of approval of the Plan by the Board and ending immediately prior to the
tenth anniversary of the earlier of the adoption of the Plan by the Board or
approval of the Plan by the Company's stockholders. Awards granted pursuant to
the Plan within such period shall not expire solely by reason of the termination
of the Plan. Awards of Incentive Options granted prior to stockholder approval
of the Plan are hereby expressly conditioned upon such approval, but in the
event of the failure of the stockholders to approve the Plan shall thereafter
and for all purposes be deemed to constitute Nonstatutory Options.

4.   STOCK SUBJECT TO THE PLAN

     At no time shall the number of shares of Common Stock issued pursuant to or
subject to outstanding Awards granted under the Plan (including pursuant to
Incentive Options) exceed 12,200,000 shares of Common Stock; SUBJECT, HOWEVER,
to the provisions of Section 8 of the Plan. For purposes of applying the
foregoing limitation, (x) if any Option expires, terminates, or is cancelled for
any reason without having been exercised in full, or if any Award of Restricted
Stock is forfeited, the shares not purchased by the Participant or forfeited by
the Participant shall again be available for Awards thereafter to be granted
under the Plan, and (y) if any Option is exercised by delivering previously
owned shares in payment of the exercise price therefor, only the net number of
shares, that is, the number of shares issued minus the number received by the
Company in payment of the exercise price, shall be considered to have been
issued pursuant to an Award granted under the Plan. Shares of Common Stock
issued pursuant to the Plan may be either authorized but unissued shares or
shares held by the Company in its treasury.

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5.   ADMINISTRATION

     The Plan shall be administered by the Committee; PROVIDED, HOWEVER, that at
any time and on any one or more occasions the Board may itself exercise any of
the powers and responsibilities assigned the Committee under the Plan and when
so acting shall have the benefit of all of the provisions of the Plan pertaining
to the Committee's exercise of its authorities hereunder; AND PROVIDED FURTHER
that the Committee may delegate to an executive officer or officers the
authority to grant Awards hereunder to employees who are not officers and to
consultants in accordance with such guidelines as the Committee shall set forth
at any time or from time to time. Subject to the provisions of the Plan, the
Committee shall have complete authority, in its discretion, to make or to select
the manner of making all determinations with respect to each Award to be granted
by the Company under the Plan in addition to any other determination allowed the
Committee under the Plan including, without limitation: (a) the employee,
consultant or director to receive the Award; (b) the form of Award; (c) whether
an Option (if granted to an employee) will be an Incentive Option or a
Nonstatutory Option; (d) the time of granting an Award; (e) the number of shares
subject to an Award; (f) the exercise price of an Option or purchase price for
shares of Restricted Stock or for a Stock Grant and the method of payment of
such exercise price or such purchase price; (g) the term of an Option; (h) the
vesting period of shares of Restricted Stock and any acceleration thereof; (i)
the exercise date or dates of an Option and any acceleration thereof; and (j)
the effect of termination of any employment, consulting or Board member
relationship with the Company or any of its Affiliates on the subsequent
exercisability of an Option or on the Risk of Forfeiture of Restricted Stock. In
making such determinations, the Committee may take into account the nature of
the services rendered by the respective employees, consultants and directors,
their present and potential contributions to the success of the Company and its
Affiliates, and such other factors as the Committee in its discretion shall deem
relevant. Subject to the provisions of the Plan, the Committee shall also have
complete authority to interpret the Plan, to prescribe, amend and rescind rules
and regulations relating to it, to determine the terms and provisions of the
respective Award Agreements (which need not be identical), and to make all other
determinations necessary or advisable for the administration of the Plan. The
Committee's determinations made in good faith on matters referred to in this
Plan shall be final, binding and conclusive on all persons having or claiming
any interest under the Plan or an Award made pursuant hereto.

6.   AUTHORIZATION AND ELIGIBILITY

     The Committee may grant from time to time and at any time prior to the
termination of the Plan one or more Awards, either alone or in combination with
any other Awards, to any employee of or consultant to one or more of the Company
and its Affiliates or to any non-employee member of the Board or of any board of
directors (or similar governing authority) of any Affiliate. However, only
employees of the Company or of any parent or subsidiary corporations of the
Company, as defined in Sections 424(e) and (f), respectively, of the Code, shall
be eligible for the grant of an Incentive Option. Further, in no event shall the
number of shares of Common Stock covered by Options or

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other Awards granted to any one person in any one calendar year (or portion of a
year) exceed 12,200,000 shares of Common Stock. Each grant of an Award shall be
subject to all applicable terms and conditions of the Plan (including but not
limited to any specific terms and conditions applicable to that type of Award
set out in Section 7 below), and such other terms and conditions, not
inconsistent with the terms of the Plan, as the Committee may prescribe. No
prospective Participant shall have any rights with respect to an Award, unless
and until such Participant has executed an agreement evidencing the Award,
delivered a fully executed copy thereof to the Company, and otherwise complied
with the applicable terms and conditions of such Award.

7.   SPECIFIC TERMS OF AWARDS

     7.1. OPTIONS.

           (a) DATE OF GRANT. The granting of an Option shall take place at the
time specified in the Award Agreement. Only if expressly so provided in the
applicable Award Agreement shall the Grant Date be the date on which the Award
Agreement shall have been duly executed and delivered by the Company and the
Optionee.

           (b) EXERCISE PRICE. The price at which shares of Common Stock may be
acquired under each Incentive Option shall be not less than 100% of the Market
Value of Common Stock on the Grant Date, or not less than 110% of the Market
Value of Common Stock on the Grant Date if the Optionee is a Ten Percent Owner.
The price at which shares may be acquired under each Nonstatutory Option shall
not be so limited solely by reason of this Section.

           (c) OPTION PERIOD. No Incentive Option may be exercised on or after
the tenth anniversary of the Grant Date, or on or after the fifth anniversary of
the Grant Date if the Optionee is a Ten Percent Owner. The Option period under
each Nonstatutory Option shall not be so limited solely by reason of this
Section.

           (d) EXERCISABILITY. An Option may be immediately exercisable or
become exercisable in such installments, cumulative or non-cumulative, as the
Committee may determine. In the case of an Option not otherwise immediately
exercisable in full, the Committee may Accelerate such Option in whole or in
part at any time; PROVIDED, HOWEVER, that in the case of an Incentive Option,
any such Acceleration of such Incentive Option would not cause such Incentive
Option to fail to comply with the provisions of Section 422 of the Code or the
Optionee consents to such Acceleration.

           (e) EFFECT OF TERMINATION OF EMPLOYMENT, CONSULTING OR BOARD MEMBER
RELATIONSHIP. Unless the Committee shall provide otherwise with respect to any
Option, if the applicable Optionee's association with the Company or any of its
Affiliates as an employee, director or consultant ends for any reason or no
reason, regardless of whether the end of such association is effected by the
Company, any such Affiliate or such Optionee (whether voluntarily or
involuntarily, including because an entity with which such Optionee has any such
association ceases to be an Affiliate of the Company), and immediately following
the end of any such association, such Optionee is not associated

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with the Company or any of its Affiliates as an employee, director or
consultant, or if such Optionee dies, then any outstanding Option initially
granted to such Optionee, whether then held by such Optionee or any other
Participant, shall cease to be exercisable in any respect not later than ninety
(90) days following the end of such association or such death and, for the
period it remains exercisable following the end of such association or such
death, shall be exercisable only to the extent exercisable on the date of the
end of such association or such death. Military or sick leave or other bona fide
leave shall not be deemed a termination of employment, PROVIDED that it does not
exceed the longer of ninety (90) days or the period during which the absent
Optionee's reemployment rights, if any, are guaranteed by statute or by
contract.

           (f) TRANSFERABILITY. Except as otherwise provided in this subsection
(f), Options shall not be transferable, and no Option or interest therein may be
sold, transferred, pledged, assigned, or otherwise alienated or hypothecated,
other than by will or by the laws of descent and distribution (subject always to
the provisions of subsection (e) above). Except as otherwise provided in this
subsection (f), all of a Participant's rights in any Option may be exercised
during the life of such Participant only by such Participant or such
Participant's legal representative. However, the applicable Award Agreement or
the Committee (at or after the grant of a Nonstatutory Option) may provide that
a Nonstatutory Option may be transferred by the applicable Participant to a
family member; PROVIDED, HOWEVER, that any such transfer is without payment of
any consideration whatsoever and that no transfer of a Nonstatutory Option shall
be valid unless first approved by the Committee, acting in its sole discretion,
unless such transfer is permitted under the applicable Award Agreement. For this
purpose, "family member" means any child, stepchild, grandchild, parent,
stepparent, spouse, former spouse, sibling, niece, nephew, mother-in-law,
father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law,
including adoptive relationships, any person sharing the applicable
Participant's household (other than a tenant or employee), a trust in which the
foregoing persons and/or the applicable Participant have more than fifty percent
(50%) of the beneficial interests, a foundation in which the foregoing persons
and/or the applicable Participant control the management of assets, and any
other entity in which these persons and/or the applicable Participant own more
than fifty percent (50%) of the voting interests. The Committee may at any time
or from time to time delegate to one or more officers of the Company the
authority to permit transfers of Nonstatutory Options to third parties pursuant
to this subsection (f), which authorization shall be exercised by such officer
or officers in accordance with guidelines established by the Committee at any
time and from time to time. The restrictions on transferability set forth in
this subsection (f) shall in no way preclude any Participant from effecting
"cashless" exercises of an Option pursuant to the terms of the Plan.

           (g) METHOD OF EXERCISE. An Option may be exercised by a Participant
giving written notice, in the manner provided in Section 15, specifying the
number of shares of Common Stock with respect to which the Option is then being
exercised. The notice shall be accompanied by payment in the form of cash or
check payable to the order of the Company in an amount equal to the exercise
price of the shares of Common Stock to be purchased or, subject in each instance
to the Committee's approval, acting in its

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sole discretion and subject to such conditions, if any, as the Committee may
deem necessary to comply with applicable laws, rules and regulations or to avoid
adverse accounting effects to the Company, by delivery to the Company of (i)
shares of Common Stock having a Market Value equal to the exercise price of the
shares to be purchased, or (ii) the Participant's executed promissory note in
the principal amount equal to the exercise price of the shares to be purchased
and otherwise in such form as the Committee shall have approved. If the Common
Stock is traded on an established market, payment of any exercise price may also
be made through and under the terms and conditions of any formal cashless
exercise program authorized by the Company entailing the sale of the Common
Stock subject to any Option in a brokered transaction (other than to the
Company). Receipt by the Company of such notice and payment in any authorized or
combination of authorized means shall constitute the exercise of the Option.
Within thirty (30) days thereafter but subject to the remaining provisions of
the Plan, the Company shall deliver or cause to be delivered to the Participant
or his agent a certificate or certificates for the number of shares then being
purchased. Such shares shall be fully paid and nonassessable. Notwithstanding
any of the foregoing provisions in this subsection (g) to the contrary, (A) no
Option shall be considered to have been exercised unless and until all of the
provisions governing such exercise specified in the Plan and in the relevant
Award Agreement shall have been duly complied with; and (B) the obligation of
the Company to issue any shares upon exercise of an Option is subject to the
provisions of Section 9.1 hereof and to compliance by the Optionee and the
Participant with all of the provisions of the Plan and the relevant Award
Agreement.

           (h) LIMIT ON INCENTIVE OPTION CHARACTERIZATION. An Incentive Option
shall be considered to be an Incentive Option only to the extent that the number
of shares of Common Stock for which the Option first becomes exercisable in a
calendar year do not have an aggregate Market Value (as of the date of the grant
of the Option) in excess of the "current limit". The current limit for any
Optionee for any calendar year shall be $100,000 MINUS the aggregate Market
Value at the date of grant of the number of shares of Common Stock available for
purchase for the first time in the same year under each other Incentive Option
previously granted to the Optionee under the Plan, and under each other
incentive stock option previously granted to the Optionee under any other
incentive stock option plan of the Company and its Affiliates, after December
31, 1986. Any shares of Common Stock which would cause the foregoing limit to be
violated shall be deemed to have been granted under a separate Nonstatutory
Option, otherwise identical in its terms to those of the Incentive Option.

           (i) NOTIFICATION OF DISPOSITION. Each person exercising any Incentive
Option granted under the Plan shall be deemed to have covenanted with the
Company to report to the Company any disposition of such shares prior to the
expiration of the holding periods specified by Section 422(a)(1) of the Code
and, if and to the extent that the realization of income in such a disposition
imposes upon the Company federal, state, local or other withholding tax
requirements, or any such withholding is required to secure for the Company an
otherwise available tax deduction, to remit to the Company an amount in cash
sufficient to satisfy those requirements.

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           (j) RIGHTS PENDING EXERCISE. No person holding an Option shall be
deemed for any purpose to be a stockholder of the Company with respect to any of
the shares of Common Stock issuable pursuant to such Option, except to the
extent that such Option shall have been exercised with respect thereto and, in
addition, a certificate shall have been issued therefor and delivered to such
person or his agent.

     7.2. RESTRICTED STOCK.

           (a) PURCHASE PRICE. Shares of Restricted Stock shall be issued under
the Plan for such consideration, in cash, other property or services, or any
combination thereof, as is determined by the Committee.

           (b) ISSUANCE OF CERTIFICATES. Subject to subsection (c) below, each
Participant receiving an Award of Restricted Stock Award shall be issued a stock
certificate in respect of such shares of Restricted Stock. Such certificate
shall be registered in the name of such Participant, and, if applicable, shall
bear an appropriate legend referring to the terms, conditions, and restrictions
applicable to such Award substantially in the following form:

                    The transferability of this certificate and the shares
                    represented by this certificate are subject to the terms and
                    conditions of the Acme Packet, Inc. 2000 Amended and
                    Restated Equity Incentive Plan and an Award Agreement
                    entered into by the registered owner and Acme Packet, Inc.
                    Copies of such Plan and Agreement are on file in the offices
                    of Acme Packet, Inc.

           (c) ESCROW OF SHARES. The Committee may require that the stock
certificates evidencing shares of Restricted Stock be held in custody by a
designated escrow agent (which may but need not be the Company) until the
restrictions thereon shall have lapsed, and that the Participant deliver a stock
power, endorsed in blank, relating to the Common Stock covered by such Award.

           (d) RESTRICTIONS AND RESTRICTION PERIOD. During the Restriction
Period applicable to shares of Restricted Stock, such shares shall be subject to
limitations on transferability and a Risk of Forfeiture arising on the basis of
such conditions related to the performance of services, Company or Affiliate
performance or otherwise as the Committee may determine and provide for in the
applicable Award Agreement. Any such Risk of Forfeiture may be waived or
terminated, or the Restriction Period shortened, at any time by the Committee on
such basis as it deems appropriate.

           (e) RIGHTS PENDING LAPSE OF RISK OF FORFEITURE OR FORFEITURE OF
AWARD. Except as otherwise provided in the Plan or the applicable Award
Agreement, at all times prior to lapse of any Risk of Forfeiture applicable to,
or forfeiture of, an Award of Restricted Stock, the Participant shall have all
of the rights of a stockholder of the Company, including the right to vote the
shares of Restricted Stock.

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           (f) EFFECT OF TERMINATION OF EMPLOYMENT, CONSULTING OR BOARD MEMBER
RELATIONSHIP. Unless otherwise determined by the Committee at or after grant and
subject to the applicable provisions of the Award Agreement, if the applicable
original grantee's association with the Company or any of its Affiliates as an
employee, director or consultant ends for any reason or no reason during the
Restriction Period, regardless of whether the end of such association is
effected by the Company, any such Affiliate or such original grantee (whether
voluntarily or involuntarily, including because an entity with which such
original grantee has any such association ceases to be an Affiliate of the
Company), and immediately following the end of any such association, such
original grantee is not associated with the Company or any of its Affiliates as
an employee, director or consultant, or if such original grantee dies, then all
outstanding shares of Restricted Stock initially granted to such original
grantee that are still subject to Risk of Forfeiture, whether then held by such
original grantee or any other Participant, shall be forfeited or otherwise
subject to return to or repurchase by the Company if and to the extent so
provided by, and subject to and in accordance with, the terms of the applicable
Award Agreement; PROVIDED, HOWEVER, that military or sick leave or other bona
fide leave shall not be deemed a termination of employment, if it does not
exceed the longer of ninety (90) days or the period during which the absent
original grantee's reemployment rights, if any, are guaranteed by statute or by
contract.

           (g) LAPSE OF RESTRICTIONS. If and when the Restriction Period expires
without a prior forfeiture of the Restricted Stock, the certificates for such
shares shall be delivered to the Participant promptly if not theretofore so
delivered.

           (h) TRANSFERABILITY. Except as otherwise provided in this subsection
(h), shares of Restricted Stock shall not be transferable, and no share of
Restricted Stock or interest therein may be sold, transferred, pledged,
assigned, or otherwise alienated or hypothecated, other than by will or by the
laws of descent and distribution (subject always to the provisions of subsection
(f) above). The applicable Award Agreement or the Committee (at or after the
grant of a share of Restricted Stock) may provide that such share of Restricted
Stock may be transferred by the applicable Participant to a family member;
PROVIDED, HOWEVER, that any such transfer is without payment of any
consideration whatsoever and that no transfer of a share of Restricted Stock
shall be valid unless first approved by the Committee, acting in its sole
discretion, unless such transfer is permitted under the applicable Award
Agreement. For this purpose, "family member" means any child, stepchild,
grandchild, parent, stepparent, spouse, former spouse, sibling, niece, nephew,
mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or
sister-in-law, including adoptive relationships, any person sharing the
applicable Participant's household (other than a tenant or employee), a trust in
which the foregoing persons and/or the applicable Participant have more than
fifty percent (50%) of the beneficial interests, a foundation in which the
foregoing persons and/or the applicable Participant control the management of
assets, and any other entity in which these persons and/or the applicable
Participant own more than fifty percent (50%) of the voting interests. The
Committee may at any time or from time to time delegate to one or more officers
of the Company the authority to permit transfers of shares of Restricted Stock
to third parties pursuant to this subsection (h), which authorization shall be
exercised by

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such officer or officers in accordance with guidelines established by the
Committee at any time and from time to time.

     7.3. STOCK GRANTS.

           (a) IN GENERAL. Stock Grants shall be issued for such consideration,
in cash, other property or services, or any combination thereof, as is
determined by the Committee. Without limiting the generality of the foregoing,
Stock Grants may be awarded in such circumstances as the Committee deems
appropriate, including without limitation in recognition of significant
contributions to the success of the Company or its Affiliates or in lieu of
compensation otherwise already due. Stock Grants shall be made without
forfeiture conditions of any kind.

           (b) ISSUANCE OF CERTIFICATES. Each Participant receiving a Stock
Grant shall be issued a stock certificate in respect of such Stock Grant. Such
certificate shall be registered in the name of such Participant, and, if
applicable, shall bear an appropriate legend referring to the terms, conditions,
and restrictions applicable to such Award substantially in the following form:

                    The transferability of this certificate and the shares
                    represented by this certificate are subject to the terms and
                    conditions of the Acme Packet, Inc. 2000 Equity Incentive
                    Plan. A copy of such Plan is on file in the offices of Acme
                    Packet, Inc.

           7.4. AWARDS TO PARTICIPANTS OUTSIDE THE UNITED STATES. The Committee
may modify the terms of any Award under the Plan granted to a Participant who
is, at the time of grant or during the term of the Award, resident or primarily
employed outside of the United States in any manner deemed by the Committee to
be necessary or appropriate in order that such Award shall conform to laws,
regulations, and customs of the country in which the Participant is then
resident or primarily employed, or so that the value and other benefits of the
Award to the Participant, as affected by foreign tax laws and other restrictions
applicable as a result of the Participant's residence or employment abroad,
shall be comparable to the value of such an Award to a Participant who is
resident or primarily employed in the United States. An Award may be modified
under this Section 7.4 in a manner that is inconsistent with the express terms
of the Plan, so long as such modifications will not contravene any applicable
law or regulation. The Committee may establish supplements to, or amendments,
restatements, or alternative versions of the Plan for the purpose of granting
and administrating any such modified Award. No such modification, supplement,
amendment, restatement or alternative version may increase the share limit of
Section 4.

8.   ADJUSTMENT PROVISIONS

     8.1. ADJUSTMENT FOR CORPORATE ACTIONS. All of the share numbers set forth
in the Plan reflect the capital structure of the Company immediately after the
closing of the initial public offering of the Company's Common Stock. Subject to
the provisions of Section 8.2, if subsequent to such date the outstanding shares
of Common Stock (or any other securities covered by the Plan by reason of the
prior application of this Section) are

                                       11
<Page>

increased, decreased, or exchanged for a different number or kind of shares or
other securities, or if additional shares or new or different shares or other
securities are distributed with respect to such shares of Common Stock or other
securities, through merger, consolidation, sale of all or substantially all the
property of the Company, reorganization, recapitalization, reclassification,
stock dividend, stock split, reverse stock split, or other distribution with
respect to such shares of Common Stock, or other securities, an appropriate and
proportionate adjustment will be made in (i) the maximum numbers and kinds of
shares provided in Section 4, (ii) the numbers and kinds of shares or other
securities subject to the then outstanding Awards, (iii) the exercise price for
each share or other unit of any other securities subject to then outstanding
Options (without change in the aggregate purchase price as to which such Options
remain exercisable), and (iv) the repurchase price of each share of Restricted
Stock then subject to a Risk of Forfeiture in the form of a Company repurchase
right.

     8.2. CHANGE OF CONTROL. Subject to the applicable provisions of the Award
Agreement, in the event of a Change of Control, the Committee shall have the
discretion, exercisable in advance of, at the time of, or (except to the extent
otherwise provided below) at any time after, the Change of Control, to provide
for any or all of the following (subject to and upon such terms as the Committee
may deem appropriate): (A) the Acceleration, in whole or in part, of any or all
outstanding Options (including Options that are assumed or replaced pursuant to
clause (C) below) that are not exercisable in full at the time the Change of
Control, such Acceleration to become effective at the time of the Change of
Control, or at such time following the Change of Control that the employment,
consulting or Board member relationship of the applicable Optionee or Optionees
with the Company and its Affiliates terminates, or at such other time or times
as the Committee shall determine; (B) the lapse or termination of the Risk of
Forfeiture (including, without limitation, any or all of the Company's
repurchase rights) with respect to outstanding Awards of Restricted Stock, such
lapse or termination to become effective at the time of the Change of Control,
or at such time following the Change of Control that the employment, consulting
or Board member relationship with the Company and its Affiliates of the
Participant or Participants that hold such Awards of Restricted Stock (or the
person to whom such Awards of Restricted Stock were initially granted)
terminates, or at such other time or times as the Committee shall determine; (C)
the assumption of outstanding Options, or the substitution of outstanding
Options with equivalent options, by the acquiring or succeeding corporation or
entity (or an affiliate thereof); or (D) the termination of all Options (other
than Options that are assumed or substituted pursuant to clause (C) above) that
remain outstanding at the time of the consummation of the Change of Control,
PROVIDED THAT, the Committee shall have made the determination to effect such
termination prior to the consummation of the Change of Control and the Committee
shall have given, or caused to be given, to all Participants written notice of
such potential termination at least five business days prior to the consummation
of the Change of Control, and PROVIDED, FURTHER, THAT, if the Committee shall
have determined in its sole and absolute discretion that the Corporation make
payment or provide consideration to the holders of such terminated Options on
account of such termination, which payment or consideration shall be on such
terms and conditions as the Committee shall have determined (and which could
consist of, in the Committee's

                                       12
<Page>

sole and absolute discretion, payment to the applicable Optionee or Optionees of
an amount of cash equal to the difference between the Market Value of the shares
of Common Stock for which the Option is then exercisable and the aggregate
exercise price for such shares under the Option), then the Corporation shall be
required to make such payment or provide such consideration in accordance with
the terms and conditions so determined by the Committee; otherwise the
Corporation shall not be required to make any payment or provide any
consideration in connection with, or as a result of, the termination of Options
pursuant to the foregoing provisions of this clause (D). The provisions of this
Section 8.2 shall not be construed as to limit or restrict in any way the
Committee's general authority under Sections 7.1(d) or 7.2(d) hereof to
Accelerate Options in whole or in part at any time or to waive or terminate at
any time any Risk of Forfeiture applicable to shares of Restricted Stock. Each
outstanding Option that is assumed in connection with a Change of Control, or is
otherwise to continue in effect subsequent to a Change of Control, will be
appropriately adjusted, immediately after the Change of Control, as to the
number and class of securities and the price at which it may be exercised in
accordance with Section 8.1.

     8.3. DISSOLUTION OR LIQUIDATION. Upon dissolution or liquidation of the
Company, each outstanding Option shall terminate, but the Optionee (if at the
time he or she has an employment, consulting or Board member relationship with
the Company or any of its Affiliates) shall have the right, immediately prior to
such dissolution or liquidation, to exercise the Option to the extent
exercisable on the date of such dissolution or liquidation.

     8.4. RELATED MATTERS. Any adjustment in Awards made pursuant to this
Section 8 shall be determined and made, if at all, by the Committee and shall
include any correlative modification of terms, including exercise prices, rates
of vesting or exercisability, Risks of Forfeiture and applicable repurchase
prices, which the Committee may deem necessary or appropriate so as to ensure
that the rights of the Participants in their respective Awards are not
substantially diminished nor enlarged as a result of the adjustment and
corporate action other than as expressly contemplated in this Section 8. No
fraction of a share shall be purchasable or deliverable upon exercise, but in
the event any adjustment hereunder of the number of shares covered by an Award
shall cause such number to include a fraction of a share, such number of shares
shall be adjusted to the nearest smaller whole number of shares. No adjustment
of an Option exercise price per share pursuant to this Section 8 shall result in
an exercise price which is less than the par value of the Common Stock.

9.   SETTLEMENT OF AWARDS

     9.1. VIOLATION OF LAW. Notwithstanding any other provision of the Plan or
the relevant Award Agreement, if, at any time, in the reasonable opinion of the
Company, the issuance of shares of Common Stock covered by an Award may
constitute a violation of law, then the Company may delay such issuance and the
delivery of a certificate for such shares until (i) approval shall have been
obtained from such governmental agencies, other than the Securities and Exchange
Commission, as may be required under any applicable

                                       13
<Page>

law, rule, or regulation and (ii) in the case where such issuance would
constitute a violation of a law administered by or a regulation of the
Securities and Exchange Commission, one of the following conditions shall have
been satisfied:

          (a) the shares are at the time of the issue of such shares
effectively registered under the Securities Act; or

          (b) the Company shall have determined, on such basis as it deems
appropriate (including an opinion of counsel in form and substance satisfactory
to the Company) that the sale, transfer, assignment, pledge, encumbrance or
other disposition of such shares or such beneficial interest, as the case may
be, does not require registration under the Securities Act or any applicable
state securities laws.

     9.2. CORPORATE RESTRICTIONS ON RIGHTS IN STOCK. Any Common Stock to be
issued pursuant to Awards granted under the Plan shall be subject to all
restrictions upon the transfer thereof which may be now or hereafter imposed by
the Certificate of Incorporation and the By-laws of the Company, each as amended
and in effect from time to time. Whenever Common Stock is to be issued pursuant
to an Award, if the Committee so directs at the time of grant (or, if such Award
is an Option, at any time prior to the exercise thereof), the Company shall be
under no obligation, notwithstanding any other provision of the Plan or the
relevant Award Agreement to the contrary, to issue such shares until such time,
if ever, as the recipient of the Award (and any person who exercises any Option,
in whole or in part), shall have become a party to and bound by any agreement
that the Committee shall require in its sole discretion. In addition, any Common
Stock to be issued pursuant to Awards granted under the Plan shall be subject to
all stop-transfer orders and other restrictions as the Committee may deem
advisable under the rules, regulations and other requirements of any stock
exchange upon which the Common Stock is then listed, and any applicable federal
or state securities laws, and the Committee may cause a legend or legends to be
put on any such certificates to make appropriate reference to such restrictions.

     9.3. INVESTMENT REPRESENTATIONS. The Company shall be under no obligation
to issue any shares covered by an Award unless the shares to be issued pursuant
to Awards granted under the Plan have been effectively registered under the
Securities Act or the Participant shall have made such written representations
to the Company (upon which the Company believes it may reasonably rely) as the
Company may deem necessary or appropriate for purposes of confirming that the
issuance of such shares will be exempt from the registration requirements of
that Act and any applicable state securities laws and otherwise in compliance
with all applicable laws, rules and regulations, including but not limited to
that the Participant is acquiring shares for his or her own account for the
purpose of investment and not with a view to, or for sale in connection with,
the distribution of any such shares.

     9.4. REGISTRATION. If the Company shall deem it necessary or desirable to
register under the Securities Act or other applicable statutes any shares of
Common Stock issued or to be issued pursuant to Awards granted under the Plan,
or to qualify any such

                                       14
<Page>

shares of Common Stock for exemption from the Securities Act or other applicable
statutes, then the Company shall take such action at its own expense. The
Company may require from each recipient of an Award, or each holder of shares of
Common Stock acquired pursuant to the Plan, such information in writing for use
in any registration statement, prospectus, preliminary prospectus or offering
circular as is reasonably necessary for such purpose and may require reasonable
indemnity to the Company and its officers and directors from such holder against
all losses, claims, damage and liabilities arising from such use of the
information so furnished and caused by any untrue statement of any material fact
therein or caused by the omission to state a material fact required to be stated
therein or necessary to make the statements therein not misleading in the light
of the circumstances under which they were made.

     9.5. LOCK-UP. Without the prior written consent of the Company or the
managing underwriter in any public offering of shares of Common Stock, no
Participant shall 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 one hundred-eighty (180) day period commencing on the
effective date of the registration statement relating to any underwritten public
offering of securities of the Company. The foregoing restrictions are intended
and shall be construed so as to preclude any Participant from engaging in any
hedging or other transaction that is designed to or reasonably could be expected
to lead to or result in, a sale or disposition of any shares of Common Stock
during such period even if such shares of Common Stock are or would be disposed
of by someone other than such Participant. 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 shares of Common Stock or
with respect to any security that includes, relates to, or derives any
significant part of its value from any shares of Common Stock. Without limiting
the generality and applicability of the foregoing provisions of this Section
9.5, if, in connection with any underwritten public offering of securities of
the Company, the managing underwriter of such offering requires that the
Company's directors and officers enter into a lock-up agreement, then (a) each
Participant (regardless of whether or not such Participant has complied or
complies with the provisions of clause (b) below) shall be bound by, and shall
be deemed to have agreed to, the same lock-up terms as those to which the
Company's directors and officers are required to adhere; and (b) at the request
of the Company or such managing underwriter, each Participant shall execute and
deliver a lock-up agreement in form and substance equivalent to that which is
required to be executed by the Company's directors and officers.

     9.6. PLACEMENT OF LEGENDS; STOP ORDERS; ETC. Each share of Common Stock to
be issued pursuant to Awards granted under the Plan may bear a reference to the
investment representations made in accordance with Section 9.3 in addition to
any other applicable restrictions under the Plan, the terms of the Award and, if
applicable, under any agreement between the Company and any Optionee and/or
Participant, and to the fact that no registration statement has been filed with
the Securities and Exchange Commission in respect to such shares of Common
Stock. All certificates for shares of

                                       15
<Page>

Common Stock or other securities delivered under the Plan shall be subject to
such stock transfer orders and other restrictions as the Committee may deem
advisable under the rules, regulations, and other requirements of any stock
exchange upon which the Common Stock is then listed, and any applicable federal
or state securities law, and the Committee may cause a legend or legends to be
placed on any such certificates to make appropriate reference to such
restrictions.

     9.7. TAX WITHHOLDING. Whenever shares of Common Stock are issued or to be
issued pursuant to Awards granted under the Plan, the Company shall have the
right to require the recipient to remit to the Company an amount sufficient to
satisfy federal, state, local or other withholding tax requirements if, when,
and to the extent required by law (whether so required to secure for the Company
an otherwise available tax deduction or otherwise) prior to the delivery of any
certificate or certificates for such shares. The obligations of the Company
under the Plan shall be conditional on satisfaction of all such withholding
obligations and the Company shall, to the extent permitted by law, have the
right to deduct any such taxes from any payment of any kind otherwise due to the
recipient of an Award. However, in such cases Participants may elect, subject to
the approval of the Committee, acting in its sole discretion, to satisfy an
applicable withholding requirement, in whole or in part, by having the Company
withhold shares to satisfy their tax obligations. Participants may only elect to
have shares of Common Stock withheld having a Market Value on the date the tax
is to be determined equal to the minimum statutory total tax which could be
imposed on the transaction. All elections shall be irrevocable, made in writing,
signed by the Participant, and shall be subject to any restrictions or
limitations that the Committee deems appropriate.

10.  RESERVATION OF STOCK

     The Company shall at all times during the term of the Plan and any
outstanding Options granted hereunder reserve or otherwise keep available such
number of shares of Common Stock as will be sufficient to satisfy the
requirements of the Plan (if then in effect) and such Options and shall pay all
fees and expenses necessarily incurred by the Company in connection therewith.

11.  NO SPECIAL SERVICE RIGHTS

     Nothing contained in the Plan or in any Award Agreement shall confer upon
any recipient of an Award any right with respect to the continuation of his or
her employment, consulting or Board member relationship or other association
with the Company (or any Affiliate), or interfere in any way with the right of
the Company (or any Affiliate), subject to the terms of any separate employment,
consulting or Board member agreement or provision of law or corporate articles
or by-laws to the contrary, at any time to terminate such employment, consulting
or Board member agreement or to increase or decrease, or otherwise adjust, the
other terms and conditions of the recipient's employment, consulting or Board
member relationship or other association with the Company and its Affiliates.

                                       16
<Page>

12.  NONEXCLUSIVITY OF THE PLAN

     Neither the adoption of the Plan by the Board nor the submission of the
Plan to the stockholders of the Company shall be construed as creating any
limitations on the power of the Board to adopt such other incentive arrangements
as it may deem desirable, including without limitation, the granting of stock
options and restricted stock other than under the Plan, and such arrangements
may be either applicable generally or only in specific cases.

13.  TERMINATION AND AMENDMENT OF THE PLAN

     The Board may at any time terminate the Plan or make such amendments or
modifications of the Plan as it shall deem advisable. In the event of the
termination of the Plan, the terms of the Plan shall survive any such
termination with respect to any Award that is outstanding on the date of such
termination, unless the holder of such Award agrees in writing to terminate such
Award or to terminate all or any of the provisions of the Plan that apply to
such Award. Unless the Board otherwise expressly provides, any amendment or
modification of the Plan shall affect the terms of any Award outstanding on the
date of such amendment or modification as well as the terms of any Award made
from and after the date of such amendment or modification; provided, however,
that, except to the extent otherwise provided in the last sentence of this
paragraph, (i) no amendment or modification of the Plan shall apply to any Award
that is outstanding on the date of such amendment or modification if such
amendment or modification would reduce the number of shares subject to such
Award, increase the purchase price applicable to shares subject to such Award or
materially adversely affect the provisions applicable to such Award that relate
to the vesting or exercisability of such Award or of the shares subject to such
Award, (ii) no amendment or modification of the Plan shall apply to any
Incentive Option that is outstanding on the date of such amendment or
modification if such amendment or modification would result in such Incentive
Option no longer being treated as an "incentive stock option" within the meaning
of Section 422 of the Code and (iii) no amendment or modification of the Plan
shall apply to any Award that is outstanding on the date of such amendment or
modification unless such amendment or modification of the Plan shall also apply
to all other Awards outstanding on the date of such amendment or modification.
In the event of any amendment or modification of the Plan that is described in
clause (i), (ii) or (iii) of the foregoing proviso, such amendment or
modification of the Plan shall apply to any Award outstanding on the date of
such amendment or modification only if the recipient of such Award consents in
writing thereto.

                                       17
<Page>

     The Committee may amend or modify, prospectively or retroactively, the
terms of any outstanding Award without amending or modifying the terms of the
Plan itself, provided that as amended or modified such Award is consistent with
the terms of the Plan as in effect at the time of the amendment or modification
of such Award, but no such amendment or modification of such Award shall,
without the written consent of the recipient of such Award, reduce the number of
shares subject to such Award, increase the purchase price applicable to shares
subject to such Award, adversely affect the provisions applicable to such Award
that relate to the vesting or exercisability of such Award or of the shares
subject to such Award, otherwise materially adversely affect the terms of such
Award (except for amendments or modifications to the terms of such Award or of
the stock subject to such Award that are expressly permitted by the terms of the
Plan or that result from any amendment or modification of the Plan in accordance
with the provisions of the first paragraph of this Section 13), or, if such
Award is an Incentive Option, result in such Incentive Option no longer being
treated as an "incentive stock option" within the meaning of Section 422 of the
Code. Notwithstanding any of the foregoing provisions of this paragraph to the
contrary, the Committee is expressly authorized to amend any or all outstanding
Options to effect a repricing thereof by lowering the purchase price applicable
to the shares of Common Stock subject to such Option or Options without the
approval of the stockholders of the Company or the holder or holders of such
Option or Options, and, in connection with such repricing, to amend or modify
any of the other terms of the Option or Options so repriced, including, without
limitation, for purposes of reducing the number of shares subject to such Option
or Options or for purposes of adversely affecting the provisions applicable to
such Option or Options that relate to the vesting or exercisability thereof, in
each case without the approval of stockholders of the Company or the holder or
holders of such Option or Options.

     In addition, notwithstanding anything express or implied in any of the
foregoing provisions of this Section 13 to the contrary, the Committee may amend
or modify, prospectively or retroactively, the terms of any outstanding Award to
the extent the Committee reasonably determines necessary or appropriate to
conform such Award to the requirements of Section 409A of the Code (concerning
non-qualified deferred compensation), if applicable.

                                       18
<Page>

14.  INTERPRETATION OF THE PLAN

     In the event of any conflict between the provisions of this Plan and the
provisions of any applicable Award Agreement, the provisions of this Plan shall
control, except if and to the extent that the conflicting provision in such
Award Agreement was authorized and approved by the Committee at the time of the
grant of the Award evidenced by such Award Agreement or is ratified by the
Committee at any time subsequent to the grant of such Award, in which case the
conflicting provision in such Award Agreement shall control. Without limiting
the generality of the foregoing provisions of this Section 14, insofar as
possible the provisions of the Plan and such Award Agreement shall be construed
so as to give full force and effect to all such provisions. In the event of any
conflict between the provisions of this Plan and the provisions of any other
agreement between the Company and the Optionee and/or Participant, the
provisions of such agreement shall control except as required to fulfill the
intention that this Plan constitute an incentive stock option plan within the
meaning of Section 422 of the Code, but insofar as possible the provisions of
the Plan and any such agreement shall be construed so as to give full force and
effect to all such provisions.

15.  NOTICES AND OTHER COMMUNICATIONS

     Any notice, demand, request or other communication hereunder to any party
shall be deemed to be sufficient if contained in a written instrument delivered
in person or duly sent by first class registered, certified or overnight mail,
postage prepaid, or telecopied with a confirmation copy by regular, certified or
overnight mail, addressed or telecopied, as the case may be, (i) if to the
recipient of an Award, at his or her residence address last filed with the
Company and (ii) if to the Company, at its principal place of business,
addressed to the attention of its Chief Executive Officer, or to such other
address or telecopier number, as the case may be, as the addressee may have
designated by notice to the addressor. All such notices, requests, demands and
other communications shall be deemed to have been received: (i) in the case of
personal delivery, on the date of such delivery; (ii) in the case of mailing,
when received by the addressee; and (iii) in the case of facsimile transmission,
when confirmed by facsimile machine report.

                                       19
<Page>

16.  GOVERNING LAW

     The Plan and all Award Agreements and actions taken thereunder shall be
governed, interpreted and enforced in accordance with the laws of The
Commonwealth of Massachusetts, without regard to the conflict of laws principles
thereof.

17.  EFFECTIVENESS OF PLAN

     This 2000 Amended and Restated Equity Incentive Plan was approved on
September 19, 2006 by the Board and September 19, 2006 by the stockholders of
the Company, and shall take effect only upon the consummation of the Company's
initial public offering of its Common Stock.

                                   ----------<Page>

                                                                   EXHIBIT 10.22

                                ACME PACKET, INC.

                           2006 EQUITY INCENTIVE PLAN

1.   PURPOSE

     This Plan is intended to encourage ownership of Common Stock by employees,
consultants and directors of the Company and its Affiliates and to provide
additional incentive for them to promote the success of the Company's business
through the grant of Awards of shares of the Company's Common Stock. The Plan is
intended to be an incentive stock option plan within the meaning of Section 422
of the Code but not all Awards granted hereunder are required to be Incentive
Options.

2.   DEFINITIONS

     As used in the Plan the following terms shall have the respective meanings
set out below, unless the context clearly requires otherwise:

     2.1. "ACCELERATE", "ACCELERATED", and "ACCELERATION", when used with
respect to an Option, means that as of the time of reference such Option will
become exercisable with respect to some or all of the shares of Common Stock for
which it was not then otherwise exercisable by its terms, and, when used with
respect to Restricted Stock or Restricted Stock Units, as the case may be, means
that the Risk of Forfeiture otherwise applicable to such Restricted Stock or
Restricted Stock Units, as the case may be, shall expire with respect to some or
all of the shares of Restricted Stock or some or all of the Restricted Stock
Units, as the case may be, then still otherwise subject to the Risk of
Forfeiture.

     2.2. "ACQUIRING PERSON" means, with respect to any Transaction or any
acquisition described in clause (ii) of the definition of Change of Control, the
surviving or acquiring person or entity in connection with such Transaction or
acquisition, as the case may be, provided that if such surviving or acquiring
person or entity is controlled, directly or indirectly, by any other person or
entity (an "Ultimate Parent Entity") that is not itself controlled by any entity
or person that is not a natural person, the term "Acquiring Person" shall mean
such Ultimate Parent Entity.

     2.3. "AFFILIATE" means, with respect to any person or entity, any other
person or entity controlling, controlled by or under common control with the
first person or entity.

     2.4. "APPLICABLE VOTING CONTROL PERCENTAGE" means twenty percent (20%).

     2.5. "AWARD" means any grant or sale pursuant to the Plan of Options,
Restricted Stock, Restricted Stock Units or Stock Grants.

     2.6. "AWARD AGREEMENT" means an agreement between the Company and the
recipient of an Award, setting forth the terms and conditions of the Award.

<Page>

     2.7. "BENEFICIAL OWNERSHIP" has the meaning ascribed to such term in Rule
13d-3, or any successor rule thereto, promulgated by the Securities and Exchange
Commission pursuant to the Exchange Act.

     2.8. "BOARD" means the Company's board of directors.

     2.9. "CHANGE OF CONTROL" means (i) the closing of any Sale of the Company
Transaction or (ii) the direct or indirect acquisition, in a single transaction
or a series of related transactions, by any person or Group (other than the
Company or a Controlled Affiliate of the Company) of Beneficial Ownership of
previously outstanding shares of capital stock of the Company if (A) immediately
after such acquisition, such person or Group, together with their respective
Affiliates, shall own or hold shares of capital stock of the Company possessing
at least the Applicable Voting Control Percentage of the total voting power of
the outstanding capital stock of the Company and (B) immediately prior to such
acquisition, such person or Group, together with their respective Affiliates,
did not own or hold shares of capital stock of the Company possessing at least
the Applicable Voting Control Percentage of the total voting power of the
outstanding capital stock of the Company. Notwithstanding anything expressed or
implied in the foregoing provisions of this definition to the contrary, any
direct or indirect acquisition referred to in clause (ii) above in this
definition shall not be treated as a Change of Control if, at any time prior to
or after such direct or indirect acquisition, a majority of the members of the
Board of Directors of the Company as constituted immediately prior to such
direct or indirect acquisition consent in writing to exclude such direct or
indirect acquisition from the scope of this definition.

     2.10. "CODE" means the Internal Revenue Code of 1986, as amended from time
to time, or any successor statute thereto, and any regulations issued from time
to time thereunder.

     2.11. "CONTROLLED AFFILIATE" means, with respect to any person or entity,
any other person or entity that is controlled by such person or entity.

     2.12. "COMMITTEE" means any committee of the Board delegated responsibility
by the Board for the administration of the Plan, as provided in Section 5 of the
Plan. For any period during which no such committee is in existence, the term
"COMMITTEE" shall mean the Board and all authority and responsibility assigned
the Committee under the Plan shall be exercised, if at all, by the Board.

     2.13. "COMMON STOCK" means common stock, par value $0.001 per share, of the
Company.

     2.14. "COMPANY" means Acme Packet, Inc., a corporation organized under the
laws of the State of Delaware.

     2.15. "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

                                       2
<Page>

     2.16. "GRANT DATE" means the date as of which an Option is granted, as
determined under Section 7.1(a).

     2.17. "GROUP" has the meaning ascribed to such term in Section 13(d)(3) of
the Exchange Act or any successor section thereto.

     2.18. "INCENTIVE OPTION" means an Option which by its terms is to be
treated as an "incentive stock option" within the meaning of Section 422 of the
Code.

     2.19. "MARKET VALUE" means the value of a share of Common Stock on a
particular date determined by such methods or procedures as may be established
by the Committee. Unless otherwise determined by the Committee, the Market Value
of Common Stock as of any date is the closing price for the Common Stock as
reported on the NASDAQ Global Market (or on any other national securities
exchange on which the Common Stock is then listed) for that date or, if no
closing price is reported for that date, the closing price on the next preceding
date for which a closing price was reported.

     2.20. "NONSTATUTORY OPTION" means any Option that is not an Incentive
Option.

     2.21. "OPTION" means an option granted under the Plan to purchase shares of
Common Stock.

     2.22. "OPTIONEE" means an employee, consultant or director of the Company
to whom an Option shall have been initially granted under the Plan.

     2.23. "PARTICIPANT" means any holder of an outstanding Award under the
Plan.

     2.24. "PLAN" means this 2006 Equity Incentive Plan of the Company, as
amended and in effect from time to time.

     2.25. "RESTRICTED STOCK" means a grant or sale pursuant to the Plan of
shares of Common Stock to an employee, consultant or director of the Company
subject to a Risk of Forfeiture.

     2.26. "RESTRICTED STOCK UNITS" means rights granted pursuant to the Plan to
receive shares of Common Stock at the close of a Restriction Period, subject to
a Risk of Forfeiture.

     2.27. "RESTRICTION PERIOD" means the period of time, established by the
Committee in connection with an Award of Restricted Stock or Restricted Stock
Units, during which the shares of Restricted Stock or the Restricted Stock Units
are subject to a Risk of Forfeiture described in the applicable Award Agreement.

     2.28. "RISK OF FORFEITURE" means a limitation on the right of a Participant
to retain an Award of Restricted Stock or Restricted Stock Units, including a
right in the Company to reacquire such Restricted Stock at less than its then
Market Value and/or the

                                       3
<Page>

forfeiture of Restricted Stock Units held by a Participant, arising because of
the occurrence or non-occurrence of specified events or conditions.

     2.29. "SALE OF THE COMPANY TRANSACTION" means any Transaction in which the
stockholders of the Company immediately prior to such Transaction, together with
any and all of such stockholders' Affiliates, do not own or hold, immediately
after consummation of such Transaction, shares of capital stock of the Acquiring
Person in connection with such Transaction possessing at least a majority of the
total voting power of the outstanding capital stock of such Acquiring Person.

     2.30. "SECURITIES ACT" means the Securities Act of 1933, as amended.

     2.31. "STOCK GRANT" means the grant pursuant to the Plan of shares of
Common Stock not subject to restrictions or other forfeiture conditions.

     2.32. "TEN PERCENT OWNER" means a person who owns, or is deemed within the
meaning of Section 422(b)(6) of the Code to own, stock possessing more than 10%
of the total combined voting power of all classes of stock of the Company (or
any parent or subsidiary corporations of the Company, as defined in Section
424(e) and (f), respectively, of the Code). Whether a person is a Ten Percent
Owner shall be determined with respect to each Option based on the facts
existing immediately prior to the Grant Date of such Option.

     2.33. "TRANSACTION" means any merger or consolidation of the Company with
or into another person or entity or the sale or transfer of all or substantially
all of the assets of the Company, in each case in a single transaction or in a
series of related transactions.

3.   TERM OF THE PLAN

     Unless the Plan shall have been earlier terminated by the Board, Awards may
be granted under this Plan at any time in the period commencing upon the
effectiveness of the Plan in accordance with the provisions of Section 17 hereof
and ending immediately prior to the tenth anniversary of the adoption of the
Plan by the Board. Awards granted pursuant to the Plan within such period shall
not expire solely by reason of the termination of the Plan. Awards of Incentive
Options granted prior to stockholder approval of the Plan are hereby expressly
conditioned upon such approval, but in the event of the failure of the
stockholders to approve the Plan shall thereafter and for all purposes be deemed
to constitute Nonstatutory Options.

4.   STOCK SUBJECT TO THE PLAN

     Subject to the provisions of Section 8 of the Plan, at no time shall the
number of shares of Common Stock issued pursuant to or subject to outstanding
Awards granted under the Plan (including, without limitation, pursuant to
Incentive Options) exceed the sum of (a) 3,000,000 shares of Common Stock plus
(b) an annual increase to be added, automatically and without further action, on
January 1 of each calendar year equal to the lesser of (i) 3,000,000 shares of
Common Stock or (ii) five percent (5%) of the

                                       4
<Page>

Company's outstanding equity on a fully diluted basis (calculated by treating
all outstanding warrants, stock options and convertible securities of the
Company, whether or not then vested or exercisable, as if they had been
exercised for or converted into the full number of shares of capital stock of
the Company subject to such outstanding warrants, stock options and convertible
securties), on the December 31 that immediately precedes such January 1;
PROVIDED, HOWEVER, that the Board may, at any time and on any one or more
occasions, take action to waive the annual increase set forth in clause (b), in
whole or in part. For purposes of applying the foregoing limitation, (x) if any
Option expires, terminates, or is cancelled for any reason without having been
exercised in full, or if any Award of Restricted Stock or Restricted Stock Units
is forfeited, the shares not purchased by the Participant or forfeited by the
Participant shall again be available for Awards thereafter to be granted under
the Plan, and (y) if any Option is exercised by delivering previously owned
shares in payment of the exercise price therefor, only the net number of shares,
that is, the number of shares issued minus the number received by the Company in
payment of the exercise price, shall be considered to have been issued pursuant
to an Award granted under the Plan. Shares of Common Stock issued pursuant to
the Plan may be either authorized but unissued shares or shares held by the
Company in its treasury.

5.   ADMINISTRATION

     The Plan shall be administered by the Committee; PROVIDED, HOWEVER, that at
any time and on any one or more occasions the Board may itself exercise any of
the powers and responsibilities assigned the Committee under the Plan and when
so acting shall have the benefit of all of the provisions of the Plan pertaining
to the Committee's exercise of its authorities hereunder; AND PROVIDED FURTHER
that the Committee may delegate to an executive officer or officers the
authority to grant Awards hereunder to employees who are not officers, and to
consultants, in accordance with such guidelines as the Committee shall set forth
at any time or from time to time. Subject to the provisions of the Plan, the
Committee shall have complete authority, in its discretion, to make or to select
the manner of making all determinations with respect to each Award to be granted
by the Company under the Plan in addition to any other determination allowed the
Committee under the Plan including, without limitation: (a) the employee,
consultant or director to receive the Award; (b) the form of Award; (c) whether
an Option (if granted to an employee) will be an Incentive Option or a
Nonstatutory Option; (d) the time of granting an Award; (e) the number of shares
subject to an Award; (f) the exercise price of an Option or purchase price, if
any, for shares of Restricted Stock or for a Stock Grant and the method of
payment of such exercise price or such purchase price; (g) the term of an
Option; (h) the vesting period of shares of Restricted Stock or of Restricted
Stock Units and any acceleration thereof; (i) the exercise date or dates of an
Option and any acceleration thereof; and (j) the effect of termination of any
employment, consulting or Board member relationship with the Company or any of
its Affiliates on the subsequent exercisability of an Option or on the Risk of
Forfeiture of Restricted Stock or Restricted Stock Units. In making such
determinations, the Committee may take into account the nature of the services
rendered by the respective employees, consultants and directors, their present
and potential contributions to the success of the Company and its Affiliates,

                                       5
<Page>

and such other factors as the Committee in its discretion shall deem relevant.
Subject to the provisions of the Plan, the Committee shall also have complete
authority to interpret the Plan, to prescribe, amend and rescind rules and
regulations relating to it, to determine the terms and provisions of the
respective Award Agreements (which need not be identical), and to make all other
determinations necessary or advisable for the administration of the Plan. The
Committee's determinations made in good faith on matters referred to in this
Plan shall be final, binding and conclusive on all persons having or claiming
any interest under the Plan or an Award made pursuant hereto.

6.   AUTHORIZATION AND ELIGIBILITY

     The Committee may grant from time to time and at any time prior to the
termination of the Plan one or more Awards, either alone or in combination with
any other Awards, to any employee of or consultant to one or more of the Company
and its Affiliates or to any non-employee member of the Board or of any board of
directors (or similar governing authority) of any Affiliate. However, only
employees of the Company or of any parent or subsidiary corporations of the
Company, as defined in Sections 424(e) and (f), respectively, of the Code, shall
be eligible for the grant of an Incentive Option. Further, in no event shall the
number of shares of Common Stock covered by Options or other Awards granted to
any one person in any one calendar year (or portion of a year) exceed 3,000,000
shares of Common Stock.

     Each grant of an Award shall be subject to all applicable terms and
conditions of the Plan (including but not limited to any specific terms and
conditions applicable to that type of Award set out in Section 7 below), and
such other terms and conditions, not inconsistent with the terms of the Plan, as
the Committee may prescribe. No prospective Participant shall have any rights
with respect to an Award, unless and until such Participant has executed an
agreement evidencing the Award, delivered a fully executed copy thereof to the
Company, and otherwise complied with the applicable terms and conditions of such
Award.

7.   SPECIFIC TERMS OF AWARDS

     7.1. OPTIONS.

           (a) DATE OF GRANT. The granting of an Option shall take place at the
time specified in the Award Agreement. Only if expressly so provided in the
applicable Award Agreement shall the Grant Date be the date on which the Award
Agreement shall have been duly executed and delivered by the Company and the
Optionee.

           (b) EXERCISE PRICE. The price at which shares of Common Stock may be
acquired under each Incentive Option shall be not less than 100% of the Market
Value of Common Stock on the Grant Date, or not less than 110% of the Market
Value of Common Stock on the Grant Date if the Optionee is a Ten Percent Owner.
The price at which shares may be acquired under each Nonstatutory Option shall
not be so limited solely by reason of this Section.

                                       6
<Page>

           (c) OPTION PERIOD. No Incentive Option may be exercised on or after
the tenth anniversary of the Grant Date, or on or after the fifth anniversary of
the Grant Date if the Optionee is a Ten Percent Owner. The Option period under
each Nonstatutory Option shall not be so limited solely by reason of this
Section.

           (d) EXERCISABILITY. An Option may be immediately exercisable or
become exercisable in such installments, cumulative or non-cumulative, as the
Committee may determine. In the case of an Option not otherwise immediately
exercisable in full, the Committee may Accelerate such Option in whole or in
part at any time; PROVIDED, HOWEVER, that in the case of an Incentive Option,
any such Acceleration of such Incentive Option would not cause such Incentive
Option to fail to comply with the provisions of Section 422 of the Code or the
Optionee consents to such Acceleration.

           (e) EFFECT OF TERMINATION OF EMPLOYMENT, CONSULTING OR BOARD MEMBER
RELATIONSHIP. Unless the Committee shall provide otherwise with respect to any
Option, if the applicable Optionee's association with the Company or any of its
Affiliates as an employee, director or consultant ends for any reason or no
reason, regardless of whether the end of such association is effected by the
Company, any such Affiliate or such Optionee (whether voluntarily or
involuntarily, including because an entity with which such Optionee has any such
association ceases to be an Affiliate of the Company), and immediately following
the end of any such association, such Optionee is not associated with the
Company or any of its Affiliates as an employee, director or consultant, or if
such Optionee dies, then any outstanding Option initially granted to such
Optionee, whether then held by such Optionee or any other Participant, shall
cease to be exercisable in any respect not later than ninety (90) days following
the end of such association or such death and, for the period it remains
exercisable following the end of such association or such death, shall be
exercisable only to the extent exercisable on the date of the end of such
association or such death. Military or sick leave or other bona fide leave shall
not be deemed a termination of employment, PROVIDED that it does not exceed the
longer of ninety (90) days or the period during which the absent Optionee's
reemployment rights, if any, are guaranteed by statute or by contract.

           (f) TRANSFERABILITY. Except as otherwise provided in this subsection
(f), Options shall not be transferable, and no Option or interest therein may be
sold, transferred, pledged, assigned, or otherwise alienated or hypothecated,
other than by will or by the laws of descent and distribution (subject always to
the provisions of subsection (e) above). Except as otherwise provided in this
subsection (f), all of a Participant's rights in any Option may be exercised
during the life of such Participant only by such Participant or such
Participant's legal representative. However, the applicable Award Agreement or
the Committee (at or after the grant of a Nonstatutory Option) may provide that
a Nonstatutory Option may be transferred by the applicable Participant to a
family member; PROVIDED, HOWEVER, that any such transfer is without payment of
any consideration whatsoever and that no transfer of a Nonstatutory Option shall
be valid unless first approved by the Committee, acting in its sole discretion,
unless such transfer is permitted under the applicable Award Agreement. For this
purpose, "family member" means any child, stepchild, grandchild, parent,
stepparent, spouse, former spouse, sibling,

                                       7
<Page>

niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law,
brother-in-law, or sister-in-law, including adoptive relationships, any person
sharing the applicable Participant's household (other than a tenant or
employee), a trust in which the foregoing persons and/or the applicable
Participant have more than fifty percent (50%) of the beneficial interests, a
foundation in which the foregoing persons and/or the applicable Participant
control the management of assets, and any other entity in which these persons
and/or the applicable Participant own more than fifty percent (50%) of the
voting interests. The Committee may at any time or from time to time delegate to
one or more officers of the Company the authority to permit transfers of
Nonstatutory Options to third parties pursuant to this subsection (f), which
authorization shall be exercised by such officer or officers in accordance with
guidelines established by the Committee at any time and from time to time. The
restrictions on transferability set forth in this subsection (f) shall in no way
preclude any Participant from effecting "cashless" exercises of an Option
pursuant to the terms of the Plan.

           (g) METHOD OF EXERCISE. An Option may be exercised by a Participant
giving written notice, in the manner provided in Section 15, specifying the
number of shares of Common Stock with respect to which the Option is then being
exercised. The notice shall be accompanied by payment in the form of cash or
check payable to the order of the Company in an amount equal to the exercise
price of the shares of Common Stock to be purchased or, subject in each instance
to the Committee's approval, acting in its sole discretion and subject to such
conditions, if any, as the Committee may deem necessary to comply with
applicable laws, rules and regulations or to avoid adverse accounting effects to
the Company, by delivery to the Company of (i) shares of Common Stock having a
Market Value equal to the exercise price of the shares to be purchased, or (ii)
the Participant's executed promissory note in the principal amount equal to the
exercise price of the shares to be purchased and otherwise in such form as the
Committee shall have approved. If the Common Stock is traded on an established
market, payment of any exercise price may also be made through and under the
terms and conditions of any formal cashless exercise program authorized by the
Company entailing the sale of the Common Stock subject to any Option in a
brokered transaction (other than to the Company). Receipt by the Company of such
notice and payment in any authorized or combination of authorized means shall
constitute the exercise of the Option. Within thirty (30) days thereafter but
subject to the remaining provisions of the Plan, the Company shall deliver or
cause to be delivered to the Participant or his agent a certificate or
certificates for the number of shares then being purchased. Such shares shall be
fully paid and nonassessable. Notwithstanding any of the foregoing provisions in
this subsection (g) to the contrary, (A) no Option shall be considered to have
been exercised unless and until all of the provisions governing such exercise
specified in the Plan and in the relevant Award Agreement shall have been duly
complied with; and (B) the obligation of the Company to issue any shares upon
exercise of an Option is subject to the provisions of Section 9.1 hereof and to
compliance by the Optionee and the Participant with all of the provisions of the
Plan and the relevant Award Agreement.

           (h) LIMIT ON INCENTIVE OPTION CHARACTERIZATION. An Incentive Option
shall be considered to be an Incentive Option only to the extent that the number
of shares

                                       8
<Page>

of Common Stock for which the Option first becomes exercisable in a calendar
year do not have an aggregate Market Value (as of the date of the grant of the
Option) in excess of the "current limit". The current limit for any Optionee for
any calendar year shall be $100,000 MINUS the aggregate Market Value at the date
of grant of the number of shares of Common Stock available for purchase for the
first time in the same year under each other Incentive Option previously granted
to the Optionee under the Plan, and under each other incentive stock option
previously granted to the Optionee under any other incentive stock option plan
of the Company and its Affiliates, after December 31, 1986. Any shares of Common
Stock which would cause the foregoing limit to be violated shall be deemed to
have been granted under a separate Nonstatutory Option, otherwise identical in
its terms to those of the Incentive Option.

           (i) NOTIFICATION OF DISPOSITION. Each person exercising any Incentive
Option granted under the Plan shall be deemed to have covenanted with the
Company to report to the Company any disposition of such shares prior to the
expiration of the holding periods specified by Section 422(a)(1) of the Code
and, if and to the extent that the realization of income in such a disposition
imposes upon the Company federal, state, local or other withholding tax
requirements, or any such withholding is required to secure for the Company an
otherwise available tax deduction, to remit to the Company an amount in cash
sufficient to satisfy those requirements.

           (j) RIGHTS PENDING EXERCISE. No person holding an Option shall be
deemed for any purpose to be a stockholder of the Company with respect to any of
the shares of Common Stock issuable pursuant to such Option, except to the
extent that such Option shall have been exercised with respect thereto and, in
addition, a certificate shall have been issued therefor and delivered to such
person or his agent.

     7.2. RESTRICTED STOCK.

           (a) PURCHASE PRICE. Shares of Restricted Stock shall be issued under
the Plan for such consideration, in cash, other property or services, or any
combination thereof, as is determined by the Committee.

           (b) ISSUANCE OF CERTIFICATES. Subject to subsection (c) below, each
Participant receiving an Award of Restricted Stock shall be issued a stock
certificate in respect of such shares of Restricted Stock. Such certificate
shall be registered in the name of such Participant, and, if applicable, shall
bear an appropriate legend referring to the terms, conditions, and restrictions
applicable to such Award substantially in the following form:

               The transferability of this certificate and the shares
               represented by this certificate are subject to the terms and
               conditions of the Acme Packet, Inc. 2006 Equity Incentive Plan
               and an Award Agreement entered into by the registered owner and
               Acme Packet, Inc. Copies of such

                                       9
<Page>

               Plan and Agreement are on file in the offices of Acme
               Packet, Inc.

           (c) ESCROW OF SHARES. The Committee may require that the stock
certificates evidencing shares of Restricted Stock be held in custody by a
designated escrow agent (which may but need not be the Company) until the
restrictions thereon shall have lapsed, and that the Participant deliver a stock
power, endorsed in blank, relating to the Common Stock covered by such Award.

           (d) RESTRICTIONS AND RESTRICTION PERIOD. During the Restriction
Period applicable to shares of Restricted Stock, such shares shall be subject to
limitations on transferability and a Risk of Forfeiture arising on the basis of
such conditions related to the performance of services, Company or Affiliate
performance or otherwise as the Committee may determine and provide for in the
applicable Award Agreement. Any such Risk of Forfeiture may be waived or
terminated, or the Restriction Period shortened, at any time by the Committee on
such basis as it deems appropriate.

           (e) RIGHTS PENDING LAPSE OF RISK OF FORFEITURE OR FORFEITURE OF
AWARD. Except as otherwise provided in the Plan or the applicable Award
Agreement, at all times prior to lapse of any Risk of Forfeiture applicable to,
or forfeiture of, an Award of Restricted Stock, the Participant shall have all
of the rights of a stockholder of the Company, including the right to vote the
shares of Restricted Stock.

           (f) EFFECT OF TERMINATION OF EMPLOYMENT, CONSULTING OR BOARD MEMBER
RELATIONSHIP. Unless otherwise determined by the Committee at or after grant and
subject to the applicable provisions of the Award Agreement, if the applicable
original grantee's association with the Company or any of its Affiliates as an
employee, director or consultant ends for any reason or no reason during the
Restriction Period, regardless of whether the end of such association is
effected by the Company, any such Affiliate or such original grantee (whether
voluntarily or involuntarily, including because an entity with which such
original grantee has any such association ceases to be an Affiliate of the
Company), and immediately following the end of any such association, such
original grantee is not associated with the Company or any of its Affiliates as
an employee, director or consultant, or if such original grantee dies, then all
outstanding shares of Restricted Stock initially granted to such original
grantee that are still subject to Risk of Forfeiture, whether then held by such
original grantee or any other Participant, shall be forfeited or otherwise
subject to return to or repurchase by the Company if and to the extent so
provided by, and subject to and in accordance with, the terms of the applicable
Award Agreement; PROVIDED, HOWEVER, that military or sick leave or other bona
fide leave shall not be deemed a termination of employment, if it does not
exceed the longer of ninety (90) days or the period during which the absent
original grantee's reemployment rights, if any, are guaranteed by statute or by
contract.

           (g) LAPSE OF RESTRICTIONS. If and when the Restriction Period expires
without a prior forfeiture of the Restricted Stock, the certificates for such
shares shall be delivered to the Participant promptly if not theretofore so
delivered.

                                       10
<Page>

           (h) TRANSFERABILITY. Except as otherwise provided in this subsection
(h), shares of Restricted Stock shall not be transferable, and no share of
Restricted Stock or interest therein may be sold, transferred, pledged,
assigned, or otherwise alienated or hypothecated, other than by will or by the
laws of descent and distribution (subject always to the provisions of subsection
(f) above). The applicable Award Agreement or the Committee (at or after the
grant of a share of Restricted Stock) may provide that such share of Restricted
Stock may be transferred by the applicable Participant to a family member;
PROVIDED, HOWEVER, that any such transfer is without payment of any
consideration whatsoever and that no transfer of a share of Restricted Stock
shall be valid unless first approved by the Committee, acting in its sole
discretion, unless such transfer is permitted under the applicable Award
Agreement. For this purpose, "family member" means any child, stepchild,
grandchild, parent, stepparent, spouse, former spouse, sibling, niece, nephew,
mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or
sister-in-law, including adoptive relationships, any person sharing the
applicable Participant's household (other than a tenant or employee), a trust in
which the foregoing persons and/or the applicable Participant have more than
fifty percent (50%) of the beneficial interests, a foundation in which the
foregoing persons and/or the applicable Participant control the management of
assets, and any other entity in which these persons and/or the applicable
Participant own more than fifty percent (50%) of the voting interests. The
Committee may at any time or from time to time delegate to one or more officers
of the Company the authority to permit transfers of shares of Restricted Stock
to third parties pursuant to this subsection (h), which authorization shall be
exercised by such officer or officers in accordance with guidelines established
by the Committee at any time and from time to time.

     7.3. RESTRICTED STOCK UNITS.

           (a) CHARACTER. Each Restricted Stock Unit shall entitle the recipient
to a share of Common Stock at a close of such Restriction Period as the
Committee may establish and subject to a Risk of Forfeiture arising on the basis
of such conditions relating to the performance of services, Company or Affiliate
performance or otherwise as the Committee may determine and provide for in the
applicable Award Agreement. Any such Risk of Forfeiture may be waived or
terminated, or the Restriction Period shortened, at any time by the Committee on
such basis as it deems appropriate.

           (b) ISSUANCE OF CERTIFICATES. Unless otherwise determined by the
Committee at or after grant and subject to the applicable provisions of the
Award Agreement, at the close of the Restriction Period applicable to any
Restricted Stock Units (including, without limitation, the close of the
applicable Restriction Period as a result of (i) any Acceleration of Restricted
Stock Units in accordance with the terms of this Plan or any applicable Award
Agreement, (ii) any waiver, lapse or termination of the Risk of Forfeiture
applicable to Restricted Stock Units in accordance with the terms of this Plan
or any applicable Award Agreement or (iii) any shortening of the Restriction
Period applicable to any Restricted Stock Units in accordance with the terms of
this Plan or any applicable Award Agreement), the Company shall deliver or cause
to be delivered to the Participant that is the holder of such Restricted Stock
Units a stock certificate in respect

                                       11
<Page>

of the shares of Common Stock subject to such Restricted Stock Units. Such
certificate shall be registered in the name of such Participant, and, if
applicable, shall bear an appropriate legend referring to the terms, conditions,
and restrictions applicable to such shares of Common Stock substantially in the
following form:

               The transferability of this certificate and the shares
               represented by this certificate are subject to the terms and
               conditions of the Acme Packet, Inc. 2006 Equity Incentive Plan
               and an Award Agreement entered into by the registered owner and
               Acme Packet, Inc. Copies of such Plan and Agreement are on file
               in the offices of Acme Packet, Inc.

           (c) DIVIDENDS. At the discretion of the Committee, Participants may
be entitled to receive payments equivalent to any dividends declared with
respect to Common Stock referenced in grants of Restricted Stock Units but only
following the close of the applicable Restriction Period and then only if the
underlying Common Stock shall have been earned. Unless the Committee shall
provide otherwise, any such dividend equivalents shall be paid, if at all,
without interest or other earnings.

           (d) EFFECT OF TERMINATION OF EMPLOYMENT, CONSULTING OR BOARD MEMBER
RELATIONSHIP. Unless otherwise determined by the Committee at or after grant and
subject to the applicable provisions of the Award Agreement, if the applicable
original grantee's association with the Company or any of its Affiliates as an
employee, director or consultant ends for any reason or no reason during the
Restriction Period, regardless of whether the end of such association is
effected by the Company, any such Affiliate or such original grantee (whether
voluntarily or involuntarily, including because an entity with which such
original grantee has any such association ceases to be an Affiliate of the
Company), and immediately following the end of any such association, such
original grantee is not associated with the Company or any of its Affiliates as
an employee, director or consultant, or if such original grantee dies, then all
outstanding Restricted Stock Units initially granted to such original grantee
that are still subject to Risk of Forfeiture, whether then held by such original
grantee or any other Participant, shall be forfeited or otherwise subject to
return to the Company in accordance with the terms of the applicable Award
Agreement; PROVIDED, HOWEVER, that military or sick leave or other bona fide
leave shall not be deemed a termination of employment, if it does not exceed the
longer of ninety (90) days or the period during which the absent original
grantee's reemployment rights, if any, are guaranteed by statute or by contract.

           (e) TRANSFERABILITY. Except as otherwise provided in this subsection
(e), Restricted Stock Units shall not be transferable, and no Restricted Stock
Unit or interest therein may be sold, transferred, pledged, assigned, or
otherwise alienated or hypothecated. The applicable Award Agreement or the
Committee (at or after the grant of a Restricted Stock Unit) may provide that
such Restricted Stock Unit may be transferred by the applicable Participant to a
family member; PROVIDED, HOWEVER, that any such transfer is without payment of
any consideration whatsoever and that no transfer of

                                       12
<Page>

a Restricted Stock Unit shall be valid unless first approved by the Committee,
acting in its sole discretion, unless such transfer is permitted under the
applicable Award Agreement. For this purpose, "family member" means any child,
stepchild, grandchild, parent, stepparent, spouse, former spouse, sibling,
niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law,
brother-in-law, or sister-in-law, including adoptive relationships, any person
sharing the applicable Participant's household (other than a tenant or
employee), a trust in which the foregoing persons and/or the applicable
Participant have more than fifty percent (50%) of the beneficial interests, a
foundation in which the foregoing persons and/or the applicable Participant
control the management of assets, and any other entity in which these persons
and/or the applicable Participant own more than fifty percent (50%) of the
voting interests. The Committee may at any time or from time to time delegate to
one or more officers of the Company the authority to permit transfers of
Restricted Stock Units to third parties pursuant to this subsection (e), which
authorization shall be exercised by such officer or officers in accordance with
guidelines established by the Committee at any time and from time to time.

           (f) RIGHTS PENDING CLOSE OF APPLICABLE RESTRICTION PERIOD. No person
holding Restricted Stock Units shall be deemed for any purpose to be a
stockholder of the Company with respect to any of the shares of Common Stock
subject to such Restricted Stock Units, except to the extent that the Restricted
Period with respect to such Restricted Stock Units shall have closed and, in
addition, a certificate shall have been issued for such shares of Common Stock
and delivered to such person or his agent. Shares of Common Stock subject to
Restricted Stock Units shall be issued and outstanding only if and to the extent
that a stock certificate representing such shares has been issued and delivered
in accordance with the provisions of this Section 7.3.

     7.4. STOCK GRANTS.

           (a) IN GENERAL. Stock Grants shall be issued for such consideration,
in cash, other property or services, or any combination thereof, as is
determined by the Committee. Without limiting the generality of the foregoing,
Stock Grants may be awarded in such circumstances as the Committee deems
appropriate, including without limitation in recognition of significant
contributions to the success of the Company or its Affiliates or in lieu of
compensation otherwise already due. Stock Grants shall be made without
forfeiture conditions of any kind.

           (b) ISSUANCE OF CERTIFICATES. Each Participant receiving a Stock
Grant shall be issued a stock certificate in respect of such Stock Grant. Such
certificate shall be registered in the name of such Participant, and, if
applicable, shall bear an appropriate legend referring to the terms, conditions,
and restrictions applicable to such Award substantially in the following form:

               The transferability of this certificate and the shares
               represented by this certificate are subject to the terms and
               conditions of the Acme Packet, Inc. 2006 Equity Incentive

                                       13
<Page>

               Plan. A copy of such Plan is on file in the offices of Acme
               Packet, Inc.

           7.5. AWARDS TO PARTICIPANTS OUTSIDE THE UNITED STATES. The Committee
may modify the terms of any Award under the Plan granted to a Participant who
is, at the time of grant or during the term of the Award, resident or primarily
employed outside of the United States in any manner deemed by the Committee to
be necessary or appropriate in order that such Award shall conform to laws,
regulations, and customs of the country in which the Participant is then
resident or primarily employed, or so that the value and other benefits of the
Award to the Participant, as affected by foreign tax laws and other restrictions
applicable as a result of the Participant's residence or employment abroad,
shall be comparable to the value of such an Award to a Participant who is
resident or primarily employed in the United States. An Award may be modified
under this Section 7.5 in a manner that is inconsistent with the express terms
of the Plan, so long as such modifications will not contravene any applicable
law or regulation. The Committee may establish supplements to, or amendments,
restatements, or alternative versions of the Plan for the purpose of granting
and administrating any such modified Award. No such modification, supplement,
amendment, restatement or alternative version may increase the share limit of
Section 4.

8.   ADJUSTMENT PROVISIONS

     8.1. ADJUSTMENT FOR CORPORATE ACTIONS. All of the share numbers set forth
in the Plan reflect the capital structure of the Company immediately after the
closing of the initial public offering of the Company's Common Stock. Subject to
the provisions of Section 8.2, if subsequent to such date the outstanding shares
of Common Stock (or any other securities covered by the Plan by reason of the
prior application of this Section) are increased, decreased, or exchanged for a
different number or kind of shares or other securities, or if additional shares
or new or different shares or other securities are distributed with respect to
such shares of Common Stock or other securities, through merger, consolidation,
sale of all or substantially all the property of the Company, reorganization,
recapitalization, reclassification, stock dividend, stock split, reverse stock
split, or other distribution with respect to such shares of Common Stock, or
other securities, an appropriate and proportionate adjustment will be made in
(i) the maximum numbers and kinds of shares provided in Section 4, (ii) the
numbers and kinds of shares or other securities subject to the then outstanding
Awards, (iii) the exercise price for each share or other unit of any other
securities subject to then outstanding Options (without change in the aggregate
purchase price as to which such Options remain exercisable), and (iv) the
repurchase price of each share of Restricted Stock then subject to a Risk of
Forfeiture in the form of a Company repurchase right.

     8.2. CHANGE OF CONTROL. Subject to the applicable provisions of the Award
Agreement, in the event of a Change of Control, the Committee shall have the
discretion, exercisable in advance of, at the time of, or (except to the extent
otherwise provided below) at any time after, the Change of Control, to provide
for any or all of the following (subject to and upon such terms as the Committee
may deem appropriate): (A) the

                                       14
<Page>

Acceleration, in whole or in part, of any or all outstanding Options (including
Options that are assumed or replaced pursuant to clause (D) below) that are not
exercisable in full at the time the Change of Control, such Acceleration to
become effective at the time of the Change of Control, or at such time following
the Change of Control that the employment, consulting or Board member
relationship of the applicable Optionee or Optionees with the Company and its
Affiliates terminates, or at such other time or times as the Committee shall
determine; (B) the lapse or termination of the Risk of Forfeiture (including,
without limitation, any or all of the Company's repurchase rights) with respect
to outstanding Awards of Restricted Stock, such lapse or termination to become
effective at the time of the Change of Control, or at such time following the
Change of Control that the employment, consulting or Board member relationship
with the Company and its Affiliates of the Participant or Participants that hold
such Awards of Restricted Stock (or the person to whom such Awards of Restricted
Stock were initially granted) terminates, or at such other time or times as the
Committee shall determine; (C) the lapse or termination of the Risk of
Forfeiture with respect to any or all outstanding Awards of Restricted Stock
Units (including Restricted Stock Units that are assumed or replaced pursuant to
clause (D) below), such lapse or termination to become effective at the time of
the Change of Control, or at such time following the Change of Control that the
employment, consulting or Board member relationship with the Company and its
Affiliates of the Participant or Participants that hold such Awards of
Restricted Stock Units (or the person to whom such Awards of Restricted Stock
Units were initially granted) terminates, or at such other time or times as the
Committee shall determine; (D) the assumption of outstanding Options or
Restricted Stock Units, or the substitution of outstanding Options or Restricted
Stock Units with equivalent options or equivalent restricted stock units, as the
case may be, by the acquiring or succeeding corporation or entity (or an
affiliate thereof); (E) the termination of all Options (other than Options that
are assumed or substituted pursuant to clause (D) above) that remain

                                       15
<Page>

outstanding at the time of the consummation of the Change of Control, PROVIDED
THAT, the Committee shall have made the determination to effect such termination
prior to the consummation of the Change of Control and the Committee shall have
given, or caused to be given, to all Participants written notice of such
potential termination at least five business days prior to the consummation of
the Change of Control, and PROVIDED, FURTHER, THAT, if the Committee shall have
determined in its sole and absolute discretion that the Corporation make payment
or provide consideration to the holders of such terminated Options on account of
such termination, which payment or consideration shall be on such terms and
conditions as the Committee shall have determined (and which could consist of,
in the Committee's sole and absolute discretion, payment to the applicable
Optionee or Optionees of an amount of cash equal to the difference between the
Market Value of the shares of Common Stock for which the Option is then
exercisable and the aggregate exercise price for such shares under the Option),
then the Corporation shall be required to make such payment or provide such
consideration in accordance with the terms and conditions so determined by the
Committee, otherwise the Corporation shall not be required to make any payment
or provide any consideration in connection with, or as a result of, the
termination of Options pursuant to the foregoing provisions of this clause (E);
or (F) the termination of all Restricted Stock Units (other than Restricted
Stock Units that are assumed or substituted pursuant to clause (D) above) that
remain outstanding at the time of the consummation of the Change of Control,
PROVIDED THAT, if the Committee shall have determined in its sole and absolute
discretion that the Corporation make payment or provide consideration to the
holders of such terminated Restricted Stock Units on account of such
termination, which payment or consideration shall be on such terms and
conditions as the Committee shall have determined (and which could consist of,
in the Committee's sole and absolute discretion, payment to the applicable
Participant or Participants of an amount of cash equal to the Market Value of
the shares of Common Stock subject to the terminated Restricted Stock Units),
then the Corporation shall be required to make such payment or provide such
consideration in accordance with the terms and conditions so determined by the
Committee, otherwise the Corporation shall not be required to make any payment
or provide any consideration in connection with, or as a result of, the
termination of Restricted Stock Units pursuant to the foregoing provisions of
this clause (F). The provisions of this Section 8.2 shall not be construed as to
limit or restrict in any way the Committee's general authority under Sections
7.1(d) or 7.2(d) hereof to Accelerate Options in whole or in part at any time or
to waive or terminate at any time any Risk of Forfeiture applicable to shares of
Restricted Stock or Restricted Stock Units. Each outstanding Option or
Restricted Stock Unit that is assumed in connection with a Change of Control, or
is otherwise to continue in effect subsequent to a Change of Control, will be
appropriately adjusted, immediately after the Change of Control, as to the
number and class of securities and the price at which it may be exercised in
accordance with Section 8.1.

     8.3. DISSOLUTION OR LIQUIDATION. Upon dissolution or liquidation of the
Company, each outstanding Option shall terminate, but the Optionee (if at the
time he or she has an employment, consulting or Board member relationship with
the Company or any of its Affiliates) shall have the right, immediately prior to
such dissolution or liquidation, to exercise the Option to the extent
exercisable on the date of such dissolution or liquidation.

     8.4. RELATED MATTERS. Any adjustment in Awards made pursuant to this
Section 8 shall be determined and made, if at all, by the Committee and shall
include any correlative modification of terms, including exercise prices, rates
of vesting or exercisability, Risks of Forfeiture and applicable repurchase
prices, which the Committee may deem necessary or appropriate so as to ensure
that the rights of the Participants in their respective Awards are not
substantially diminished nor enlarged as a result of the adjustment and
corporate action other than as expressly contemplated in this Section 8. No
fraction of a share shall be purchasable or deliverable upon exercise, but in
the event any adjustment hereunder of the number of shares covered by an Award
shall cause such number to include a fraction of a share, such number of shares
shall be adjusted to the nearest smaller whole number of shares. No adjustment
of an Option exercise price per share pursuant to this Section 8 shall result in
an exercise price which is less than the par value of the Common Stock.

                                       16
<Page>

9.   SETTLEMENT OF AWARDS

     9.1. VIOLATION OF LAW. Notwithstanding any other provision of the Plan or
the relevant Award Agreement, if, at any time, in the reasonable opinion of the
Company, the issuance of shares of Common Stock covered by an Award may
constitute a violation of law, then the Company may delay such issuance and the
delivery of a certificate for such shares until (i) approval shall have been
obtained from such governmental agencies, other than the Securities and Exchange
Commission, as may be required under any applicable law, rule, or regulation and
(ii) in the case where such issuance would constitute a violation of a law
administered by or a regulation of the Securities and Exchange Commission, one
of the following conditions shall have been satisfied:

          (a) the shares are at the time of the issue of such shares
effectively registered under the Securities Act; or

          (b) the Company shall have determined, on such basis as it deems
appropriate (including an opinion of counsel in form and substance satisfactory
to the Company) that the sale, transfer, assignment, pledge, encumbrance or
other disposition of such shares or such beneficial interest, as the case may
be, does not require registration under the Securities Act or any applicable
state securities laws.

     9.2. CORPORATE RESTRICTIONS ON RIGHTS IN STOCK. Any Common Stock to be
issued pursuant to Awards granted under the Plan shall be subject to all
restrictions upon the transfer thereof which may be now or hereafter imposed by
the Certificate of Incorporation and the By-laws of the Company, each as amended
and in effect from time to time. Whenever Common Stock is to be issued pursuant
to an Award, if the Committee so directs at the time of grant (or, if such Award
is an Option, at any time prior to the exercise thereof), the Company shall be
under no obligation, notwithstanding any other provision of the Plan or the
relevant Award Agreement to the contrary, to issue such shares until such time,
if ever, as the recipient of the Award (and any person who exercises any Option,
in whole or in part), shall have become a party to and bound by any agreement
that the Committee shall require in its sole discretion. In addition, any Common
Stock to be issued pursuant to Awards granted under the Plan shall be subject to
all stop-transfer orders and other restrictions as the Committee may deem
advisable under the rules, regulations and other requirements of any stock
exchange upon which the Common Stock is then listed, and any applicable federal
or state securities laws, and the Committee may cause a legend or legends to be
put on any such certificates to make appropriate reference to such restrictions.

     9.3. INVESTMENT REPRESENTATIONS. The Company shall be under no obligation
to issue any shares covered by an Award unless the shares to be issued pursuant
to Awards granted under the Plan have been effectively registered under the
Securities Act or the Participant shall have made such written representations
to the Company (upon which the Company believes it may reasonably rely) as the
Company may deem necessary or appropriate for purposes of confirming that the
issuance of such shares will be exempt from the registration requirements of
that Act and any applicable state securities laws and

                                       17
<Page>

otherwise in compliance with all applicable laws, rules and regulations,
including but not limited to that the Participant is acquiring shares for his or
her own account for the purpose of investment and not with a view to, or for
sale in connection with, the distribution of any such shares.

     9.4. REGISTRATION. If the Company shall deem it necessary or desirable to
register under the Securities Act or other applicable statutes any shares of
Common Stock issued or to be issued pursuant to Awards granted under the Plan,
or to qualify any such shares of Common Stock for exemption from the Securities
Act or other applicable statutes, then the Company shall take such action at its
own expense. The Company may require from each recipient of an Award, or each
holder of shares of Common Stock acquired pursuant to the Plan, such information
in writing for use in any registration statement, prospectus, preliminary
prospectus or offering circular as is reasonably necessary for such purpose and
may require reasonable indemnity to the Company and its officers and directors
from such holder against all losses, claims, damage and liabilities arising from
such use of the information so furnished and caused by any untrue statement of
any material fact therein or caused by the omission to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading in the light of the circumstances under which they were made.

     9.5. LOCK-UP. Without the prior written consent of the Company or the
managing underwriter in any public offering of shares of Common Stock, no
Participant shall 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 one hundred-eighty (180) day period commencing on the
effective date of the registration statement relating to any underwritten public
offering of securities of the Company. The foregoing restrictions are intended
and shall be construed so as to preclude any Participant from engaging in any
hedging or other transaction that is designed to or reasonably could be expected
to lead to or result in, a sale or disposition of any shares of Common Stock
during such period even if such shares of Common Stock are or would be disposed
of by someone other than such Participant. 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 shares of Common Stock or
with respect to any security that includes, relates to, or derives any
significant part of its value from any shares of Common Stock. Without limiting
the generality and applicability of the foregoing provisions of this Section
9.5, if, in connection with any underwritten public offering of securities of
the Company, the managing underwriter of such offering requires that the
Company's directors and officers enter into a lock-up agreement, then (a) each
Participant (regardless of whether or not such Participant has complied or
complies with the provisions of clause (b) below) shall be bound by, and shall
be deemed to have agreed to, the same lock-up terms as those to which the
Company's directors and officers are required to adhere; and (b) at the request
of the Company or such managing underwriter, each Participant shall execute and
deliver a lock-up agreement in form and substance equivalent to that which is
required to be executed by the Company's directors and officers.

                                       18
<Page>

     9.6. PLACEMENT OF LEGENDS; STOP ORDERS; ETC. Each share of Common Stock to
be issued pursuant to Awards granted under the Plan may bear a reference to the
investment representations made in accordance with Section 9.3 in addition to
any other applicable restrictions under the Plan, the terms of the Award and, if
applicable, under any agreement between the Company and any Optionee and/or
Participant, and to the fact that no registration statement has been filed with
the Securities and Exchange Commission in respect to such shares of Common
Stock. All certificates for shares of Common Stock or other securities delivered
under the Plan shall be subject to such stock transfer orders and other
restrictions as the Committee may deem advisable under the rules, regulations,
and other requirements of any stock exchange upon which the Common Stock is then
listed, and any applicable federal or state securities law, and the Committee
may cause a legend or legends to be placed on any such certificates to make
appropriate reference to such restrictions.

     9.7. TAX WITHHOLDING. Whenever shares of Common Stock are issued or to be
issued pursuant to Awards granted under the Plan, the Company shall have the
right to require the recipient to remit to the Company an amount sufficient to
satisfy federal, state, local or other withholding tax requirements if, when,
and to the extent required by law (whether so required to secure for the Company
an otherwise available tax deduction or otherwise) prior to the delivery of any
certificate or certificates for such shares. The obligations of the Company
under the Plan shall be conditional on satisfaction of all such withholding
obligations and the Company shall, to the extent permitted by law, have the
right to deduct any such taxes from any payment of any kind otherwise due to the
recipient of an Award. However, in such cases Participants may elect, subject to
the approval of the Committee, acting in its sole discretion, to satisfy an
applicable withholding requirement, in whole or in part, by having the Company
withhold shares to satisfy their tax obligations. Participants may only elect to
have shares of Common Stock withheld having a Market Value on the date the tax
is to be determined equal to the minimum statutory total tax which could be
imposed on the transaction. All elections shall be irrevocable, made in writing,
signed by the Participant, and shall be subject to any restrictions or
limitations that the Committee deems appropriate.

10.  RESERVATION OF STOCK

     The Company shall at all times during the term of the Plan and any
outstanding Options granted hereunder reserve or otherwise keep available such
number of shares of Common Stock as will be sufficient to satisfy the
requirements of the Plan (if then in effect) and such Options and shall pay all
fees and expenses necessarily incurred by the Company in connection therewith.

11.  NO SPECIAL SERVICE RIGHTS

     Nothing contained in the Plan or in any Award Agreement shall confer upon
any recipient of an Award any right with respect to the continuation of his or
her employment, consulting or Board member relationship or other association
with the Company (or any Affiliate), or interfere in any way with the right of
the Company (or

                                       19
<Page>

any Affiliate), subject to the terms of any separate employment, consulting or
Board member agreement or provision of law or corporate articles or by-laws to
the contrary, at any time to terminate such employment, consulting or Board
member agreement or to increase or decrease, or otherwise adjust, the other
terms and conditions of the recipient's employment, consulting or Board member
relationship or other association with the Company and its Affiliates.

12.  NONEXCLUSIVITY OF THE PLAN

     Neither the adoption of the Plan by the Board nor the submission of the
Plan to the stockholders of the Company shall be construed as creating any
limitations on the power of the Board to adopt such other incentive arrangements
as it may deem desirable, including without limitation, the granting of stock
options, restricted stock and restricted stock units other than under the Plan,
and such arrangements may be either applicable generally or only in specific
cases.

13.  TERMINATION AND AMENDMENT OF THE PLAN

     The Board may at any time terminate the Plan or make such amendments or
modifications of the Plan as it shall deem advisable. In the event of the
termination of the Plan, the terms of the Plan shall survive any such
termination with respect to any Award that is outstanding on the date of such
termination, unless the holder of such Award agrees in writing to terminate such
Award or to terminate all or any of the provisions of the Plan that apply to
such Award. Unless the Board otherwise expressly provides, any amendment or
modification of the Plan shall affect the terms of any Award outstanding on the
date of such amendment or modification as well as the terms of any Award made
from and after the date of such amendment or modification; PROVIDED, HOWEVER,
that, except to the extent otherwise provided in the last sentence of this
paragraph, (i) no amendment or modification of the Plan shall apply to any Award
that is outstanding on the date of such amendment or modification if such
amendment or modification would reduce the number of shares subject to such
Award, increase the purchase price applicable to shares subject to such Award or
materially adversely affect the provisions applicable to such Award that relate
to the vesting or exercisability of such Award or of the shares subject to such
Award, (ii) no amendment or modification of the Plan shall apply to any
Incentive Option that is outstanding on the date of such amendment or
modification if such amendment or modification would result in such Incentive
Option no longer being treated as an "incentive stock option" within the meaning
of Section 422 of the Code and (iii) no amendment or modification of the Plan
shall apply to any Award that is outstanding on the date of such amendment or
modification unless such amendment or modification of the Plan shall also apply
to all other Awards outstanding on the date of such amendment or modification.
In the event of any amendment or modification of the Plan that is described in
clause (i), (ii) or (iii) of the foregoing proviso, such amendment or
modification of the Plan shall apply to any Award outstanding on the date of
such amendment or modification only if the recipient of such Award consents in
writing thereto.

                                       20
<Page>

     The Committee may amend or modify, prospectively or retroactively, the
terms of any outstanding Award without amending or modifying the terms of the
Plan itself, PROVIDED THAT as amended or modified such Award is consistent with
the terms of the Plan as in effect at the time of the amendment or modification
of such Award, but no such amendment or modification of such Award shall,
without the written consent of the recipient of such Award, reduce the number of
shares subject to such Award, increase the purchase price applicable to shares
subject to such Award, adversely affect the provisions applicable to such Award
that relate to the vesting or exercisability of such Award or of the shares
subject to such Award, or otherwise materially adversely affect the terms of
such Award (except for amendments or modifications to the terms of such Award or
of the stock subject to such Award that are expressly permitted by the terms of
the Plan or that result from any amendment or modification of the Plan in
accordance with the provisions of the first paragraph of this Section 13), or,
if such Award is an Incentive Option, result in such Incentive Option no longer
being treated as an "incentive stock option" within the meaning of Section 422
of the Code. Notwithstanding any of the foregoing provisions of this paragraph
to the contrary, the Committee is expressly authorized to amend any or all
outstanding Options to effect a repricing thereof by lowering the purchase price
applicable to the shares of Common Stock subject to such Option or Options
without the approval of the stockholders of the Company or the holder or holders
of such Option or Options, and, in connection with such repricing, to amend or
modify any of the other terms of the Option or Options so repriced, including,
without limitation, for purposes of reducing the number of shares subject to
such Option or Options or for purposes of adversely affecting the provisions
applicable to such Option or Options that relate to the vesting or
exercisability thereof, in each case without the approval of stockholders of the
Company or the holder or holders of such Option or Options.

     In addition, notwithstanding anything express or implied in any of the
foregoing provisions of this Section 13 to the contrary, the Committee may amend
or modify, prospectively or retroactively, the terms of any outstanding Award to
the extent the Committee reasonably determines necessary or appropriate to
conform such Award to the requirements of Section 409A of the Code (concerning
non-qualified deferred compensation), if applicable.

14.  INTERPRETATION OF THE PLAN

     In the event of any conflict between the provisions of this Plan and the
provisions of any applicable Award Agreement, the provisions of this Plan shall
control, except if and to the extent that the conflicting provision in such
Award Agreement was authorized and approved by the Committee at the time of the
grant of the Award evidenced by such Award Agreement or is ratified by the
Committee at any time subsequent to the grant of such Award, in which case the
conflicting provision in such Award Agreement shall control. Without limiting
the generality of the foregoing provisions of this Section 14, insofar as
possible the provisions of the Plan and such Award Agreement shall be construed
so as to give full force and effect to all such provisions. In the event of any
conflict between the provisions of this Plan and the provisions of any other
agreement

                                       21
<Page>

between the Company and the Optionee and/or Participant, the provisions of such
agreement shall control except as required to fulfill the intention that this
Plan constitute an incentive stock option plan within the meaning of Section 422
of the Code, but insofar as possible the provisions of the Plan and any such
agreement shall be construed so as to give full force and effect to all such
provisions.

15.  NOTICES AND OTHER COMMUNICATIONS

     Any notice, demand, request or other communication hereunder to any party
shall be deemed to be sufficient if contained in a written instrument delivered
in person or duly sent by first class registered, certified or overnight mail,
postage prepaid, or telecopied with a confirmation copy by regular, certified or
overnight mail, addressed or telecopied, as the case may be, (i) if to the
recipient of an Award, at his or her residence address last filed with the
Company and (ii) if to the Company, at its principal place of business,
addressed to the attention of its Chief Executive Officer, or to such other
address or telecopier number, as the case may be, as the addressee may have
designated by notice to the addressor. All such notices, requests, demands and
other communications shall be deemed to have been received: (i) in the case of
personal delivery, on the date of such delivery; (ii) in the case of mailing,
when received by the addressee; and (iii) in the case of facsimile transmission,
when confirmed by facsimile machine report.

16.  GOVERNING LAW

     The Plan and all Award Agreements and actions taken thereunder shall be
governed, interpreted and enforced in accordance with the laws of The
Commonwealth of Massachusetts, without regard to the conflict of laws principles
thereof.

17.  EFFECTIVENESS OF PLAN

     This 2006 Equity Incentive Plan was approved on September 19, 2006 by the
Board and September 19, 2006 by the stockholders of the Company, and shall take
effect only upon the consummation of the Company's initial public offering of
its Common Stock.

                                       22

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