Document:

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                                                                   EXHIBIT 10.15

                                  RUBRIC, INC.

                             1997 STOCK OPTION PLAN

     1.   Purposes of the Plan. The purposes of this Stock Option Plan are to
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to Employees, Directors and
Consultants and to promote the success of the Company's business. Options
granted under the Plan may be Incentive Stock Options or Nonstatutory Stock
Options, as determined by the Administrator at the time of grant. Stock Purchase
Rights may also be granted under the Plan.

     2.   Definitions. As used herein, the following definitions shall apply:

          1.   "Administrator" means the Board or any of its Committees as shall
be administering the Plan in accordance with Section 4 hereof.

          2.   "Applicable Laws" means the requirements relating to the
administration of stock option plans under U.S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any other country or jurisdiction where Options or Stock Purchase Rights are
granted under the Plan.

          3.   "Board" means the Board of Directors of the Company.

          4.   "Code" means the Internal Revenue Code of 1986, as amended.

          5.   "Committee" means a committee of Directors appointed by the Board
in accordance with Section 4 hereof.

          6.   "Common Stock" means the Common Stock of the Company.

          7.   "Company" means Rubric, Inc., a Delaware corporation.

          8.   "Consultant" means any person who is engaged by the Company or
any Parent or Subsidiary to render consulting or advisory services to such
entity.

          9.   "Director" means a member of the Board of Directors of the
Company.

          10.  "Disability" means total and permanent disability as defined in
Section 22(e)(3) of the Code.
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          11.  "Employee" means any person, including Officers and Directors,
employed by the Company or any Parent or Subsidiary of the Company. A Service
Provider shall not cease to be an Employee in the case of (i) any leave of
absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may exceed ninety days,
unless reemployment upon expiration of such leave is guaranteed by statute or
contract. If reemployment upon expiration of a leave of absence approved by the
Company is not so guaranteed, on the 181st day of such leave any Incentive Stock
Option held by the Optionee shall cease to be treated as an Incentive Stock
Option and shall be treated for tax purposes as a Nonstatutory Stock Option.
Neither service as a Director nor payment of a director's fee by the Company
shall be sufficient to constitute "employment" by the Company.

          12.  "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

          13.  "Fair Market Value" means, as of any date, the value of Common
Stock determined as follows:

               1.   If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable;

               2.   If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean between the high bid and low asked prices for the Common Stock
on the last market trading day prior to the day of determination; or

               3.   In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Administrator.

          14.  "Incentive Stock Option" means an Option intended to qualify as
an incentive stock option within the meaning of Section 422 of the Code.

          15.  "Nonstatutory Stock Option" means an Option not intended to
qualify as an Incentive Stock Option.

          16.  "Officer" means a person who is an officer of the Company within
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

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          17.  "Option" means a stock option granted pursuant to the Plan.

          18.  "Option Agreement" means a written or electronic agreement
 between the Company and an Optionee evidencing the terms and conditions of an
individual Option grant. The Option Agreement is subject to the terms and
conditions of the Plan.

               1.   "Option Exchange Program" means a program whereby
 outstanding Options are exchanged for Options with a lower exercise price.

          19.  "Optioned Stock" means the Common Stock subject to an Option or a
Stock Purchase Right.

          20.  "Optionee" means the holder of an outstanding Option or Stock
Purchase Right granted under the Plan.

          21.  "Parent" means a "parent corporation," whether now or hereafter
existing, as defined in Section 424(e) of the Code.

          22.  "Plan" means this 1997 Stock Option Plan.

          23.  "Restricted Stock" means shares of Common Stock acquired pursuant
to a grant of a Stock Purchase Right under Section 11 below.

          24.  "Section 16(b)" means Section 16(b) of the Securities Exchange
Act of 1934, as amended.

          25.  "Service Provider" means an Employee, Director or Consultant.

          26.  "Share" means a share of the Common Stock, as adjusted in
accordance with Section 12 below.

          27.  "Stock Purchase Right" means a right to purchase Common Stock
pursuant to Section 11 below.

          28.  "Subsidiary" means a "subsidiary corporation," whether now or
hereafter existing, as defined in Section 424(f) of the Code.

     3.   Stock Subject to the Plan. Subject to the provisions of Section 12 of
the Plan, the maximum aggregate number of Shares which may be subject to option
and sold under the Plan is [_________] Shares. The Shares may be authorized but
unissued, or reacquired Common Stock.

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     If an Option or Stock Purchase Right expires or becomes unexercisable
without having been exercised in full, or is surrendered pursuant to an Option
Exchange Program, the unpurchased Shares which were subject thereto shall become
available for future grant or sale under the Plan (unless the Plan has
terminated). However, Shares that have actually been issued under the Plan, upon
exercise of either an Option or Stock Purchase Right, shall not be returned to
the Plan and shall not become available for future distribution under the Plan,
except that if Shares of Restricted Stock are repurchased by the Company at
their original purchase price, such Shares shall become available for future
grant under the Plan.

     1.   Administration of the Plan.

          1.   Administrator. The Plan shall be administered by the Board or a
Committee appointed by the Board, which Committee shall be constituted to comply
with Applicable Laws.

          2.   Powers of the Administrator. Subject to the provisions of the
Plan and, in the case of a Committee, the specific duties delegated by the Board
to such Committee, and subject to the approval of any relevant authorities, the
Administrator shall have the authority in its discretion:

               1.   to determine the Fair Market Value;

               2.   to select the Service Providers to whom Options and Stock
Purchase Rights may from time to time be granted hereunder;

               3.   to determine the number of Shares to be covered by each such
award granted hereunder;

               4.   to approve forms of agreement for use under the Plan;

               5.   to determine the terms and conditions, of any Option or
Stock Purchase Right granted hereunder. Such terms and conditions include, but
are not limited to, the exercise price, the time or times when Options or Stock
Purchase Rights may be exercised (which may be based on performance criteria),
any vesting acceleration or waiver of forfeiture restrictions, and any
restriction or limitation regarding any Option or Stock Purchase Right or the
Common Stock relating thereto, based in each case on such factors as the
Administrator, in its sole discretion, shall determine;

               6.   to determine whether and under what circumstances an Option
may be settled in cash under subsection 9(e) instead of Common Stock;

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               7.   to reduce the exercise price of any Option to the then
current Fair Market Value if the Fair Market Value of the Common Stock covered
by such Option has declined since the date the Option was granted;

               8.   to initiate an Option Exchange Program;

               9.   to prescribe, amend and rescind rules and regulations
relating to the Plan, including rules and regulations relating to sub-plans
established for the purpose of qualifying for preferred tax treatment under
foreign tax laws;

               10.  to allow Optionees to satisfy withholding tax obligations by
electing to have the Company withhold from the Shares to be issued upon exercise
of an Option or Stock Purchase Right that number of Shares having a Fair Market
Value equal to the amount required to be withheld. The Fair Market Value of the
Shares to be withheld shall be determined on the date that the amount of tax to
be withheld is to be determined. All elections by Optionees to have Shares
withheld for this purpose shall be made in such form and under such conditions
as the Administrator may deem necessary or advisable; and

               11.  to construe and interpret the terms of the Plan and awards
granted pursuant to the Plan.

          3.   Effect of Administrator's Decision. All decisions, determinations
and interpretations of the Administrator shall be final and binding on all
Optionees.

          4.   Eligibility.

               1.   Nonstatutory Stock Options and Stock Purchase Rights may be
granted to Service Providers. Incentive Stock Options may be granted only to
Employees.

               2.   Each Option shall be designated in the Option Agreement as
either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options. For purposes of this
Section 5(b), Incentive Stock Options shall be taken into account in the order
in which they were granted. The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

               3.   Neither the Plan nor any Option or Stock Purchase Right
shall confer upon any Optionee any right with respect to continuing the
Optionee's relationship as a Service Provider with the Company, nor shall it
interfere in any way

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with his or her right or the Company's right to terminate such relationship at
any time, with or without cause.

               5.   Term of Plan. The Plan shall become effective upon its
adoption by the Board. It shall continue in effect for a term of ten (10) years
unless sooner terminated under Section 14 of the Plan.

               6.   Term of Option. The term of each Option shall be stated in
the Option Agreement; provided, however, that the term shall be no more than ten
(10) years from the date of grant thereof. In the case of an Incentive Stock
Option granted to an Optionee who, at the time the Option is granted, owns stock
representing more than ten percent (10%) of the voting power of all classes of
stock of the Company or any Parent or Subsidiary, the term of the Option shall
be five (5) years from the date of grant or such shorter term as may be provided
in the Option Agreement.

               7.   Option Exercise Price and Consideration.

                    1.   The per share exercise price for the Shares to be
issued upon exercise of an Option shall be such price as is determined by the
Administrator, but shall be subject to the following:

                         1.   In the case of an Incentive Stock Option

                              1.   granted to an Employee who, at the time of
grant of such Option, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary,
the exercise price shall be no less than 110% of the Fair Market Value per Share
on the date of grant.

                              1.   granted to any other Employee, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

                         2.   In the case of a Nonstatutory Stock Option

                               1.   granted to a Service Provider who, at the
time of grant of such Option, owns stock representing more than ten percent
(10%) of the voting power of all classes of stock of the Company or any Parent
or Subsidiary, the exercise price shall be no less than 110% of the Fair Market
Value per Share on the date of grant.

                               2.   granted to any other Service Provider, the
per Share exercise price shall be no less than 85% of the Fair Market Value per
Share on the date of grant.

                         3.   Notwithstanding the foregoing, Options may be
granted with a per Share exercise price other than as required above pursuant to
a merger or other corporate transaction.

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                         2.   The consideration to be paid for the Shares to be
issued upon exercise of an Option, including the method of payment, shall be
determined by the Administrator (and, in the case of an Incentive Stock Option,
shall be determined at the time of grant). Such consideration may consist of (1)
cash, (2) check, (3) promissory note, (4) other Shares which (x) in the case of
Shares acquired upon exercise of an Option, have been owned by the Optionee for
more than six months on the date of surrender, and (y) have a Fair Market Value
on the date of surrender equal to the aggregate exercise price of the Shares as
to which such Option shall be exercised, (5) consideration received by the
Company under a cashless exercise program implemented by the Company in
connection with the Plan, or (6) any combination of the foregoing methods of
payment. In making its determination as to the type of consideration to accept,
the Administrator shall consider if acceptance of such consideration may be
reasonably expected to benefit the Company.

     8.   Exercise of Option.

          1.   Procedure for Exercise; Rights as a Stockholder. Any Option
granted hereunder shall be exercisable according to the terms hereof at such
times and under such conditions as determined by the Administrator and set forth
in the Option Agreement. Except in the case of Options granted to Officers,
Directors and Consultants, Options shall become exercisable at a rate of no less
than 20% per year over five (5) years from the date the Options are granted.
Unless the Administrator provides otherwise, vesting of Options granted
hereunder shall be tolled during any unpaid leave of absence. An Option may not
be exercised for a fraction of a Share.

               An Option shall be deemed exercised when the Company receives:
(i) written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised. Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan. Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Shares, notwithstanding the exercise of the Option. The
Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised. No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 12 of the Plan.

               Exercise of an Option in any manner shall result in a decrease in
the number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

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          2.   Termination of Relationship as a Service Provider. If an Optionee
ceases to be a Service Provider, such Optionee may exercise his or her Option
within such period of time as is specified in the Option Agreement (of at least
thirty (30) days) to the extent that the Option is vested on the date of
termination (but in no event later than the expiration of the term of the Option
as set forth in the Option Agreement). In the absence of a specified time in the
Option Agreement, the Option shall remain exercisable for three (3) months
following the Optionee's termination. If, on the date of termination, the
Optionee is not vested as to his or her entire Option, the Shares covered by the
unvested portion of the Option shall revert to the Plan. If, after termination,
the Optionee does not exercise his or her Option within the time specified by
the Administrator, the Option shall terminate, and the Shares covered by such
Option shall revert to the Plan.

          3.   Disability of Optionee. If an Optionee ceases to be a Service
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option Agreement
(of at least six (6) months) to the extent the Option is vested on the date of
termination (but in no event later than the expiration of the term of such
Option as set forth in the Option Agreement). In the absence of a specified time
in the Option Agreement, the Option shall remain exercisable for twelve (12)
months following the Optionee's termination. If, on the date of termination, the
Optionee is not vested as to his or her entire Option, the Shares covered by the
unvested portion of the Option shall revert to the Plan. If, after termination,
the Optionee does not exercise his or her Option within the time specified
herein, the Option shall terminate, and the Shares covered by such Option shall
revert to the Plan.

          4.   Death of Optionee. If an Optionee dies while a Service Provider,
the Option may be exercised within such period of time as is specified in the
Option Agreement (of at least six (6) months) to the extent that the Option is
vested on the date of death (but in no event later than the expiration of the
term of such Option as set forth in the Option Agreement) by the Optionee's
estate or by a person who acquires the right to exercise the Option by bequest
or inheritance. In the absence of a specified time in the Option Agreement, the
Option shall remain exercisable for twelve (12) months following the Optionee's
termination. If, at the time of death, the Optionee is not vested as to the
entire Option, the Shares covered by the unvested portion of the Option shall
immediately revert to the Plan. If the Option is not so exercised within the
time specified herein, the Option shall terminate, and the Shares covered by
such Option shall revert to the Plan.

          5.   Buyout Provisions. The Administrator may at any time offer to buy
out for a payment in cash or Shares, an Option previously granted, based on such
terms and conditions as the Administrator shall establish and communicate to the
Optionee at the time that such offer is made.

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          9.   Non-Transferability of Options and Stock Purchase Rights. The
Options and Stock Purchase Rights may not be sold, pledged, assigned,
hypothecated, transferred, or disposed of in any manner other than by will or by
the laws of descent or distribution and may be exercised, during the lifetime of
the Optionee, only by the Optionee.

          10.  Stock Purchase Rights.

               1.   Rights to Purchase. Stock Purchase Rights may be issued
either alone, in addition to, or in tandem with other awards granted under the
Plan and/or cash awards made outside of the Plan. After the Administrator
determines that it will offer Stock Purchase Rights under the Plan, it shall
advise the offeree in writing or electronically of the terms, conditions and
restrictions related to the offer, including the number of Shares that such
person shall be entitled to purchase, the price to be paid, and the time within
which such person must accept such offer. The terms of the offer shall comply in
all respects with Section 260.140.42 of Title 10 of the California Code of
Regulations. The offer shall be accepted by execution of a Restricted Stock
purchase agreement in the form determined by the Administrator.

               2.   Repurchase Option. Unless the Administrator determines
otherwise, the Restricted Stock purchase agreement shall grant the Company a
repurchase option exercisable upon the voluntary or involuntary termination of
the purchaser's service with the Company for any reason (including death or
disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock purchase agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company. The repurchase option shall lapse at such rate as the
Administrator may determine. Except with respect to Shares purchased by
Officers, Directors and Consultants, the repurchase option shall in no case
lapse at a rate of less than 20% per year over five (5) years from the date of
purchase.

               3.   Other Provisions. The Restricted Stock purchase agreement
shall contain such other terms, provisions and conditions not inconsistent with
the Plan as may be determined by the Administrator in its sole discretion.

               4.   Rights as a Stockholder. Once the Stock Purchase Right is
exercised, the purchaser shall have rights equivalent to those of a stockholder
and shall be a stockholder when his or her purchase is entered upon the records
of the duly authorized transfer agent of the Company. No adjustment shall be
made for a dividend or other right for which the record date is prior to the
date the Stock Purchase Right is exercised, except as provided in Section 12 of
the Plan.

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          11.  Adjustments Upon Changes in Capitalization, Merger or Asset Sale.

               1.   Changes in Capitalization. Subject to any required action by
the stockholderss of the Company, the number of shares of Common Stock covered
by each outstanding Option or Stock Purchase Right, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options or Stock Purchase Rights have yet been granted or which have
been returned to the Plan upon cancellation or expiration of an Option or Stock
Purchase Right, as well as the price per share of Common Stock covered by each
such outstanding Option or Stock Purchase Right, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company. The conversion of any convertible securities of
the Company shall not be deemed to have been "effected without receipt of
consideration." Such adjustment shall be made by the Board, whose determination
in that respect shall be final, binding and conclusive. Except as expressly
provided herein, no issuance by the Company of shares of stock of any class, or
securities convertible into shares of stock of any class, shall affect, and no
adjustment by reason thereof shall be made with respect to, the number or price
of shares of Common Stock subject to an Option or Stock Purchase Right.

               2.   Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option or Stock Purchase Right until
fifteen (15) days prior to such transaction as to all of the Optioned Stock
covered thereby, including Shares as to which the Option or Stock Purchase Right
would not otherwise be exercisable. In addition, the Administrator may provide
that any Company repurchase option applicable to any Shares purchased upon
exercise of an Option or Stock Purchase Right shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated. To the extent it has not been previously exercised, an
Option or Stock Purchase Right will terminate immediately prior to the
consummation of such proposed action.

               3.   Merger or Asset Sale. In the event of a merger of the
Company with or into another corporation, or the sale of substantially all of
the assets of the Company, each outstanding Option and Stock Purchase Right
shall be assumed or an equivalent option or right substituted by the successor
corporation or a Parent or Subsidiary of the successor corporation. In the event
that the successor corporation refuses to assume or substitute for the Option or
Stock Purchase Right, the Optionee shall fully vest in and have the right to
exercise the Option or Stock Purchase Right as to all of the Optioned Stock,
including Shares as to which it would not otherwise be vested or exercisable. If
an Option or Stock Purchase Right becomes fully vested and

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exercisable in lieu of assumption or substitution in the event of a merger or
sale of assets, the Administrator shall notify the Optionee in writing or
electronically that the Option or Stock Purchase Right shall be fully
exercisable for a period of fifteen (15) days from the date of such notice, and
the Option or Stock Purchase Right shall terminate upon the expiration of such
period. For the purposes of this paragraph, the Option or Stock Purchase Right
shall be considered assumed if, following the merger or sale of assets, the
option or right confers the right to purchase or receive, for each Share of
Optioned Stock subject to the Option or Stock Purchase Right immediately prior
to the merger or sale of assets, the consideration (whether stock, cash, or
other securities or property) received in the merger or sale of assets by
holders of Common Stock for each Share held on the effective date of the
transaction (and if holders were offered a choice of consideration, the type of
consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger or sale of
assets is not solely common stock of the successor corporation or its Parent,
the Administrator may, with the consent of the successor corporation, provide
for the consideration to be received upon the exercise of the Option or Stock
Purchase Right, for each Share of Optioned Stock subject to the Option or Stock
Purchase Right, to be solely common stock of the successor corporation or its
Parent equal in fair market value to the per share consideration received by
holders of Common Stock in the merger or sale of assets.

          12.  Time of Granting Options and Stock Purchase Rights. The date of
grant of an Option or Stock Purchase Right shall, for all purposes, be the date
on which the Administrator makes the determination granting such Option or Stock
Purchase Right, or such other date as is determined by the Administrator. Notice
of the determination shall be given to each Service Provider to whom an Option
or Stock Purchase Right is so granted within a reasonable time after the date of
such grant.

          13.  Amendment and Termination of the Plan.

               1.   Amendment and Termination. The Board may at any time amend,
alter, suspend or terminate the Plan.

               2.   Stockholder Approval. The Board shall obtain stockholder
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

               3.   Effect of Amendment or Termination. No amendment,
alteration, suspension or termination of the Plan shall impair the rights of any
Optionee, unless mutually agreed otherwise between the Optionee and the
Administrator, which agreement must be in writing and signed by the Optionee and
the Company. Termination of the Plan shall not affect the Administrator's
ability to exercise the powers granted to it hereunder with respect to Options
granted under the Plan prior to the date of such termination.

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               1.   Conditions Upon Issuance of Shares.

                    4.   Legal Compliance. Shares shall not be issued pursuant
to the exercise of an Option unless the exercise of such Option and the issuance
and delivery of such Shares shall comply with Applicable Laws and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

                    5.   Investment Representations. As a condition to the
exercise of an Option, the Administrator may require the person exercising such
Option to represent and warrant at the time of any such exercise that the Shares
are being purchased only for investment and without any present intention to
sell or distribute such Shares if, in the opinion of counsel for the Company,
such a representation is required.

               14.  Inability to Obtain Authority. The inability of the Company
to obtain authority from any regulatory body having jurisdiction, which
authority is deemed by the Company's counsel to be necessary to the lawful
issuance and sale of any Shares hereunder, shall relieve the Company of any
liability in respect of the failure to issue or sell such Shares as to which
such requisite authority shall not have been obtained.

               15.  Reservation of Shares. The Company, during the term of this
Plan, shall at all times reserve and keep available such number of Shares as
shall be sufficient to satisfy the requirements of the Plan.

               16.  Stockholder Approval. The Plan shall be subject to approval
by the stockholders of the Company within twelve (12) months after the date the
Plan is adopted. Such stockholder approval shall be obtained in the degree and
manner required under Applicable Laws.

               17.  Information to Optionees and Purchasers. The Company shall
provide to each Optionee and to each individual who acquires Shares pursuant to
the Plan, not less frequently than annually during the period such Optionee or
purchaser has one or more Options or Stock Purchase Rights outstanding, and, in
the case of an individual who acquires Shares pursuant to the Plan, during the
period such individual owns such Shares, copies of annual financial statements.
The Company shall not be required to provide such statements to key employees
whose duties in connection with the Company assure their access to equivalent
information.<PAGE>   1

                                                                   EXHIBIT 10.15

                              QUINTUS CORPORATION

                       AUTHORIZED OEM/RESELLER AGREEMENT

This Authorized OEM/Reseller Agreement (the "Agreement") is entered into as of
December 3, 1999, (the "Effective Date") by and between Quintus Corporation, a
Delaware corporation, having its principal place of business at 47212 Mission
Falls Court, Fremont, CA 94539 ("Quintus") and Lipstream Networks, Inc., a
Delaware Corporation with its principal place of business at 20401 Stevens Creek
Blvd., Cupertino, CA 95014 ("Lipstream").

In consideration of the covenants and conditions contained herein, the parties
agree as follows:

1.   DEFINITIONS.

     1.1  "Documentation" shall mean the related materials customarily supplied
by Lipstream to end users of the Licensed Software.

     1.2  "End-User" shall mean a third party to whom Quintus licenses the
Integrated Software or the Client solely for internal use and not for resale.
In the case of Quintus' internal use of the Integrated Software or Client,
Quintus shall be deemed the End-User.

     1.3  "Integrated Software" shall mean the Quintus products, which are sold
in conjunction with the Client and Quintus-developed customer relationship
applications, modified to include Lipstream's voice client functionality
through use of the SDK.

     1.4  "Updates" shall mean any error corrections or modifications which
Lipstream at its sole discretion deems to be logical improvements to the
Licensed Software previously supplied to Quintus under the Agreement, and which
Lipstream makes generally available to other licensees, and does not separately
price or market.

     1.5  "Client" shall mean the standard, generally available object code
commercial release and the underlying voice functionality of Lipstream's client
software described in Exhibit A that Lipstream distributes without charge. This
shall include all updates provided by Lipstream to Quintus under the terms of
this Agreement.

     1.6  "SDK" shall mean Software Developer's Kit, which is Lipstream's
development software that facilitates the integration of the Client into other
software.

2.   CUSTOMER OFFERINGS.

Quintus will integrate Client functionality, through the use of the SDK, into
its suite of web-based customer relationship management applications (the "End
User Offerings"). This End User Offering shall be comprised of three components:

     2.1  Integrated Software as defined above.

                                       1
<PAGE>   2
     2.2  Voice Service - Initial Block: An initial provision of pre-paid voice
usage to support an End User's Customer Service Representative's ("CSR") first
year of VoIP service to be acquired by End User through Quintus ("Initial
Block"). For example: If an End User purchases Integrated Software from Quintus
and contracts to allow up to 25 of its support CSRs to make use of such
software simultaneously, End User will be required to pre-purchase 25 Initial
Blocks to support the voice traffic to be generated by these CSRs in the first
year.

     2.3  Voice Service - Renewal Block(s). One-year extensions to the Initial
Blocks described above, are to be negotiated by Lipstream directly with the End
User.

3.   HOSTING.

Lipstream will host and continuously provide the voice services for the End
User.

4.   SALES.

Sales Responsibilities shall be as follows:

     4.1  Initial Sale. Quintus shall be responsible for all initial sales of
the Integrated Software and the Initial Blocks to support voice usage. Should
an End User seek to increase the number of CSR's during the first year, Quintus
will be responsible for selling the additional blocks required to accommodate
such an increase and will pro rate the fees until the end of the initial year.

     4.2  Renewal Sales. Lipstream shall be responsible for all sales of all
Renewal Blocks, both in the year directly following the Initial Block term as
well as all subsequent years. Quintus will make proper introductions between
Lipstream and End User at the time of initial sale.

5.   GRANT OF RIGHTS.

     5.1  Licenses. Subject to the terms and conditions of this Agreement,
Lipstream hereby grants to Quintus a limited, nonexclusive, nontransferable,
worldwide license during the term of this Agreement to (i) market and
distribute the Client and Documentation solely as part of the Integrated
Software in object code format for use by End-Users for their internal business
purposes only, (ii) allow Quintus' current resellers and distributors and
future resellers and distributors upon Lipstream's prior written consent, such
consent not to be unreasonably withheld, the right to market and distribute the
Client and Documentation, solely as part of the Integrated Software in object
code format for use by End Users for their internal business purposes only,
provided such reseller and/or distributor sublicenses the Client in accordance
with terms and conditions no less restrictive than those provided herein, (iii)
use the Client for its own internal use, and (iv) use the SDK to integrate the
Client into the Integrated Software. Quintus shall have no right to use,
license, distribute or otherwise transfer the Client or Documentation other
than those rights specifically granted hereunder.

     5.2  License to Clients. Subject to all terms of this Agreement, Lipstream
hereby grants to Quintus and Quintus' resellers and distributors, for the term
of this Agreement, a worldwide, nonexclusive, royalty free license to use,
reproduce and distribute the Clients to End Users of the Integrated Software.

                                       2
<PAGE>   3
     5.3  License to Documentation. Subject to all terms of this Agreement,
Lipstream grants to Quintus, for the term of this Agreement, a worldwide,
non-exclusive royalty free license to use, reproduce and distribute the
Documentation, but only in connection with the use or maintenance of the
Clients.

     5.4  Updates. Subject to all terms of this Agreement, Lipstream will
promptly provide to Quintus, during the term of this Agreement, all generally
available upgrades, releases and/or new versions of the Clients and/or
Documentation that Lipstream distributes without charge.

     5.5  Ownership. Quintus acknowledges that Lipstream retains title to and
ownership of all proprietary rights with respect to the Client and
Documentation. The Client and Documentation are protected by copyright,
trademark and trade secret laws and international treaty provisions. The
Client and Documentation are licensed and not sold.

     5.6  Development Copy. Quintus may use an unlimited number of copies of
the Integrated Software on an unlimited number of development and test servers,
at no additional charge, solely for demonstration, evaluation, training,
development and testing purposes during the term of this Agreement. Such copies
may not be deployed for operational use.

     5.7  No Other Rights. All rights not expressly granted to Quintus herein
are retained by Lipstream. Quintus agrees not to decompile, reverse-engineer or
otherwise attempt to derive or modify the Integrated Software, SDK or Client,
nor authorize or permit any third party to do so.

6.   COMPENSATION.

     6.1  Setup. Quintus shall reimburse Lipstream for access to its voice
services in the following way: Lipstream will create a new End User account,
and will establish an ongoing, web-based, End User-specific reporting facility,
to be made continuously available to Quintus for the monitoring of its End
User's voice usage at no charge to Quintus.

     6.2  Initial Block Fees. Quintus will pay Lipstream the Initial Block fees
as described in Exhibit B.

     6.3  Training Fees. Lipstream will provide End Users with an optional
one-day voice service training session for all End User-employed customer
service, support, engineering and/or managerial personnel the End User
identifies as requiring such training. Fees for such training shall be as
described in Exhibit B.

     6.4  Payment. On the [*] day of each new quarter, Quintus shall submit to
Lipstream a report detailing the End Users that have been sold services. Such
report shall be in reasonable detail, showing the basis for the payment. Payment
of such fees shall be due and payable net [*] from the receipt of the report.

     6.5  Records; Audit Rights. Quintus shall maintain complete and accurate
books and records with respect to copies and distribution of Client and
Integrated Software, or otherwise pertaining to the payment of fees hereunder
until at least three (3) years after termination of this Agreement. Lipstream
shall at any time, on at least twenty (20) business days prior notice to

[*] Certain information in this exhibit has been omitted and filed separately
    with the Commission. Confidential treatment has been requested with respect
    to the omitted portions.

                                       3
<PAGE>   4
Quintus, be entitled to retain an accounting firm to audit the books and
records of Quintus pertaining to the payment of fees to Lipstream hereunder,
for the sole purpose of confirming the accuracy of the License Fee payments.
Such accounting firm shall execute a nondisclosure agreement prior to any such
audit. Any such audit shall be performed at Lipstream's expense during normal
business hours. In the event of any underpayment of License Fees, Quintus shall
promptly remit to Lipstream all amounts due.

     6.6  Reporting. The parties shall comply with the reporting requirements
as found in Exhibit E.

     6.7  Taxes. All payments to Lipstream hereunder shall be net of all sales,
use, and other taxes, which may be imposed upon such payments.

7.   LIMITED WARRANTIES.

     7.1  Product Warranty. Lipstream warrants to Quintus and End User that,
for the term of this agreement (a) the media on which the Client is furnished
will, under normal use, be free from defects in material and workmanship and
(b) the Client will perform in accordance with the Documentation. Lipstream's
sole obligation under this warranty, and Quintus' exclusive remedy, shall be
that Lipstream at its expense shall use commercially reasonable efforts to
repair, so that it becomes non-infringing while giving equivalent performance,
or replace any non-conforming Client with substantially equivalent functional
software. Quintus has the right to terminate this Agreement should the Client
not conform to the then current Documentation, provided Quintus has given
Lipstream written notification of such nonconformance and such nonconformance
has not been cured within a sixty (60) day period, commencing upon receipt of
such written notification. In the event Lipstream is unable to correct the
non-conformity, Lipstream's sole liability and Quintus' sole remedy shall be a
refund of the Fees paid to Lipstream. If Quintus terminates this Agreement,
Quintus shall immediately return to Lipstream or destroy the Client and all
related Documentation at Lipstream's option. Upon receipt or destruction of the
Client and related Documentation, Lipstream shall refund the fees paid by
Quintus relating to the specific non-conforming Client.

     7.2  The warranty set forth above is made to and for the benefit of
Quintus only. The warranty will apply only if:

          (a)  the Client has been installed and used at all times and in
accordance with the Documentation;

          (b)  no modification, alteration or addition has been made to the
Client by persons other than Lipstream or its authorized representative;

          (c)  the media in which the Client is embedded has not been (i)
subject to accident, or misuse, or (ii) operated with other media not meeting
or not maintained in accordance with the manufacturer's specifications.

     7.3  Representations. Quintus shall not make any warranties or
representations binding on Lipstream with respect to the Services, and Quintus
shall limit its representations regarding the

                                       4

<PAGE>   5
Services to those contained in this Agreement. Quintus shall indemnify and hold
Lipstream harmless from and against warranty claims made by End-Users for
warranties made by Quintus that exceed the scope of the warranty expressly set
forth above.

     7.4  WARRANTY DISCLAIMER. EXCEPT AS EXPRESSLY STATED HEREIN, THE CLIENT IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, WARRANTIES OF PERFORMANCE OR MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE OR NON-INFRINGEMENT.

8.   PROPERTY RIGHTS.

8.1  Property Rights. Quintus acknowledges and agrees that, as between Quintus
and Lipstream, Lipstream owns all right, title, and interest in and to the
Client, SDK and Documentation subject to this Agreement, and in all of
Lipstream's patents, trademarks, trade names, inventions, copyrights, know-how
and trade secrets relating to the design, manufacture, marketing, operation or
service of the Client.

     8.2  Proprietary Notices. Quintus will ensure that all copies of the
Client, the Documentation and the Integrated Software reproduced or distributed
by Quintus, as applicable, will incorporate all copyright or other proprietary
notices in the same manner that Lipstream incorporates such notices in the
Client or Documentation or in any other manner reasonably requested by
Lipstream. Quintus shall not, and shall require that its End-Users do not,
remove, alter, cover or obfuscate any copyright notice or other proprietary
rights notices placed on, or embedded in the Client or Documentation by
Lipstream.

     8.3  Restrictions. Quintus shall not alter or remove any of Lipstream's
trademarks, marks or trade names (collectively "Trademarks") affixed to the
Client by Lipstream. Except as set forth in this Section 5.4, nothing contained
in this Agreement shall grant or shall be deemed to grant to Quintus any
right, title or interest in or to Lipstream's Trademarks. At no time during or
after the term of this Agreement shall Quintus challenge or assist others to
challenge Lipstream's Trademarks (except to the extent such restriction is
expressly prohibited by applicable law) or the registration thereof or attempt
to register any trademarks, marks or trade names confusingly similar to those
of Lipstream. Upon termination of this Agreement, Quintus shall immediately
cease to use all Lipstream's Trademarks.

     8.4  Goodwill. Any and all goodwill arising from Quintus' use of the
Lipstream Trademarks shall inure solely to the benefit of Lipstream when and
as, on an on-going basis, such acquisition of goodwill occurs, as well as at
the expiration or termination of this Agreement, without any separate payment
or other consideration of any kind to Quintus and Quintus agrees to take all
such actions necessary to effect such vesting.

9.   CONFIDENTIAL INFORMATION.

     9.1  Definition. As used in this Agreement, the term "Confidential
Information" shall mean any information disclosed by one party to the other
pursuant to this Agreement which is in

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<PAGE>   6
written, graphic, machine readable or other tangible form and is marked
"Confidential", "Proprietary" or in some other manner to indicate its
confidential nature. Confidential Information may also include oral information
disclosed by one party to the other pursuant to this Agreement, provided that
such information is designated as confidential at the time of disclosure and
reduced to a written summary by the disclosing party, within a reasonable time
period after its oral disclosure, which is marked in a manner to indicate its
confidential nature and delivered to the receiving party. Notwithstanding the
foregoing, the SDK and the SDK Documentation shall be deemed the Confidential
Information of Lipstream without the necessity of marking.

     9.2  General.  During the term of this Agreement and for a period of three
(3) years thereafter, each party shall treat as confidential all Confidential
Information of the other party, shall not use such Confidential Information
except as expressly set forth herein or otherwise authorized in writing, shall
implement reasonable procedures to prohibit the disclosure, unauthorized
duplication, misuse or removal of the other party's Confidential Information
and shall not disclose such Confidential Information to any third party except
as may be necessary and required in connection with the rights and obligations
of such party under this Agreement, and subject to confidentiality and nonuse
obligations at least as protective as those set forth herein. Without limiting
the foregoing, each of the parties shall use at least the same procedures and
degree of care which it uses to prevent the disclosure of its own confidential
information of like importance to prevent the disclosure of Confidential
Information disclosed to it by the other party under this Agreement, but in no
event less than reasonable care. The parties further agree to keep confidential
the terms and conditions of this Agreement.

     9.3  Exceptions. Notwithstanding the above, neither party shall have
liability to the other with regard to any Confidential Information of the other
which: (i) was generally known and available in the public domain at the time
it was disclosed or becomes generally known and available in the public domain
through no fault of the receiving party; (ii) was known to the receiving party
at the time of disclosure; (iii) is disclosed with the prior written approval
of the disclosing party; (iv) was independently developed by the receiving
party without any use of the disclosing party's Confidential Information; or
(v) becomes known to the receiving party from a source other than the
disclosing party without breach of this Agreement by the receiving party and
otherwise not in violation of the disclosing party's rights. In addition, the
receiving party shall be entitled to disclose the other party's Confidential
Information to the extent such disclosure is required by order or requirement
of a court, administrative agency, or other governmental body, provided
however, that the receiving party shall provide prompt notice thereof to the
disclosing party to enable the disclosing party to seek a protective order or
otherwise prevent or restrict such disclosure.

     9.4  Employee Agreements.  Each party shall obtain the execution of
non-disclosure agreements with its employees, agents and consultants having
access to Confidential Information of the other party, and shall diligently
enforce such agreements.

     9.5  Remedies.  If either party breaches any of its obligations with
respect to confidentiality and unauthorized use of Confidential Information
hereunder, the other party shall be entitled to seek equitable relief to
protect its interest therein, including but not limited to injunctive relief, as
well as money damages.

                                       6

<PAGE>   7
10.  INTELLECTUAL PROPERTY INDEMNITY.

     10.1  Indemnification. Lipstream shall defend, or at its option settle, at
its own expense, any claim, suit or proceeding brought against Quintus, its
officers, employees, directors and agents and Lipstream agrees to pay, subject
to the limitations hereinafter set forth, all reasonable damages and costs
(including reasonable attorney's fees), finally awarded against Quintus, as a
result of any such claim or any settlement entered into in good faith on such
issue in any such suit or proceeding, alleging that use of the SDK or Client or
distribution of the Client as part of the Integrated Software as contemplated
hereunder infringes any patent, copyright or trade secret of any third party
(collectively, "Intellectual Property Rights"). Lipstream's duty to indemnify
and defend is predicted upon Quintus doing the following (i) notify Lipstream
promptly of such claim, suit or proceeding, (ii) provide Lipstream with sole
control of any such action or settlement negotiations (it being understood that
Quintus may participate in such action at Quintus' expense with counsel of its
own choosing), and (iii) give Lipstream authority to proceed as contemplated
herein, and, at Lipstream's expense, give Lipstream proper and full
information and reasonable assistance to settle and/or defend any such claim,
suit or proceeding. If it is adjudicatively determined, or if Lipstream
believes it may be determined, that the SDK or Client infringes any
Intellectual Property Right, then Lipstream may, at its sole option and
expense, and in a reasonable time frame, either; (a) procure for Quintus the
right under such Intellectual Property Right to use or distribute such SDK and
Client as contemplated herein; (b) replace or modify the SDK and Client with
other functionally equivalent software; or (c) if (a) and (b) are not
practicable, as determined in Lipstream's sole discretion, terminate this
Agreement with respect to such SDK and Client and refund to Quintus all license
fees paid by Quintus for the terminated SDK and Client, less an amount equal
to one sixtieth (1/60th) of such license fees for each month or any portion
thereof which has elapsed since the commencement of the applicable license.
Lipstream will not be liable for any costs or expenses incurred without its
prior written authorization.

     10.2  Limitation. Notwithstanding the provisions of Section 10.1 above,
Lipstream assumes no liability to the extent such claims are based on (i) the
use of the SDK or Client other than as set forth in the Documentation; (ii) the
use of other than the most recent version and prior sequential version of the
SDK or Client; (iii) combination or use of the SDK or Client with software not
provided by Lipstream if the infringement would have been avoided by use of the
SDK or Client alone; (iv) any marking or branding not applied by Lipstream or
applied at the request of an authorized employee of Quintus; or (v) any
modification of the SDK or Client, or any part thereof, unless such
modification was made by or authorized by Lipstream, if the infringement would
have been avoided in the absence of such modification.

     10.3  Entire Liability. THE FOREGOING PROVISIONS OF THIS SECTION 10 STATE
THE ENTIRE LIABILITY AND OBLIGATIONS OF LIPSTREAM, AND THE EXCLUSIVE REMEDY OF
QUINTUS, WITH RESPECT TO THE INFRINGEMENT OF ANY PATENT, COPYRIGHT, TRADE
SECRET OR OTHER INTELLECTUAL PROPERTY RIGHT BY THE SDK OR CLIENT.

                                       7
<PAGE>   8
11.  LIMITED LIABILITY.

     11.1 EXCEPT FOR LIABILITY UNDER SECTIONS 5, 9 AND 10, IN NO EVENT SHALL
EITHER PARTY'S LIABILITY TO THE OTHER PARTY OR ANY THIRD PARTY ARISING OUT OF
THIS AGREEMENT EXCEED THE TOTAL AMOUNT ACTUALLY RECEIVED BY LIPSTREAM. EXCEPT
FOR LIABILITY UNDER SECTIONS 5, 9 AND 10, IN NO EVENT WILL EITHER PARTY BE
LIABLE TO THE OTHER PARTY OR ANY OTHER ENTITY FOR ANY SPECIAL, CONSEQUENTIAL OR
INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, DAMAGES FOR THE LOSS OF USE,
LOSS OF PROFITS AND/OR FOR THE LOSS OF DATA OR INFORMATION OF ANY KIND UNDER
ANY CAUSE OF ACTION, WHETHER FOR BREACH OF CONTRACT (INCLUDING NEGLIGENCE), OR
OTHERWISE, AND WHETHER OR NOT SUCH PARTY OR ITS AGENTS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. NOTHING IN THIS SECTION 8 IS INTENDED TO EXCLUDE OR
RESTRICT EITHER PARTY'S LIABILITY FOR DEATH OR PERSONAL INJURY OR PROPERTY
DAMAGE CAUSED BY THE GROSS NEGLIGENCE OF SUCH PARTY OR ITS EMPLOYEES OR AGENTS.

12.  TERM AND TERMINATION.

     12.1 Term. This Agreement shall commence upon the Effective Date and shall
continue in force for an initial term of Two (2) years unless terminated
earlier under the terms of this Section 9. Thereafter, this Agreement may be
renewed for successive one (1) year terms unless terminated by either party as
set forth herein.

     12.2 Termination. This Agreement may be terminated by either party upon
ninety (90) days written notice for no cause or if the other party (i) breaches
any material term or condition of this Agreement and fails to remedy the breach
within thirty (30) days after being given notice thereof, or (ii) ceases to
function as a going concern or to conduct operations in the normal course of
business, (iii) has a petition filed by or against it under any state or
federal bankruptcy or insolvency laws which petition has not been dismissed or
set aside within sixty (60) days of filing.

     12.3 Effect of Termination. In the event this Agreement is terminated,
Quintus' rights under this Agreement shall terminate, provided, however, that
Quintus' shall have the right to distribute its inventory of Integrated
Software in existence as of the date of termination, and each End-User's rights
to use the Integrated Software previously licensed to it by Quintus shall
survive. The SDK and Client and other Lipstream materials provided hereunder
will remain the property of Lipstream. Within thirty (30) days after the
termination of this Agreement, Quintus will prepare all such items in its
possession or control for shipment, or destroy such materials as Lipstream may
direct. Upon termination of this Agreement, neither party will retain any
copies of Confidential Information which may have been entrusted to it by the
other party, and within thirty (30) days of a written request by the other
party, an authorized representative of each party shall certify to the other
party that all copies of Confidential Information of the other party received
hereunder have been returned or destroyed. Notwithstanding the foregoing,
Quintus may retain one (1) copy of the Client and one (1) copy of any related
Documentation and may use such materials as is necessary to support its
installed End-User base. Quintus may honor any outstanding quotes for potential
End Users for a period of sixty (60) days commencing with the termination of
this Agreement.

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<PAGE>   9
     12.4 Limitation. In the event of termination by either party in accordance
with any of the provisions of this Agreement, neither party shall be liable to
the other because of such termination, for compensation, reimbursement or
damages on account of the loss of prospective profits or anticipated sales or
on account of expenditures, inventory, investment, leases or commitments in
connection with the business or goodwill of Lipstream or Quintus. Termination
shall not, however, relieve either party of obligations incurred prior to the
termination.

     12.5 Survival of Provisions. The provisions of Sections 7, 8, 9, 10, 11,
15.9 and 15.10 of this Agreement shall survive the termination of this
Agreement for any reason. All other rights and obligations of the parties shall
cease upon termination of this Agreement.

13.  MAINTENANCE AND ENHANCEMENT

     13.1  Maintenance. Provided the Client is used in accordance with the terms
and conditions of the Agreement, Lipstream will provide technical support,
upgrades and enhancements to Quintus as indicated herein for the current,
unaltered version of the Client at no charge to Quintus. All support provided by
Lipstream shall be in accordance with Exhibit D.

     13.2 Initial Block Term. During the term of the Initial Block, Lipstream
will support Quintus in the integration of the voice service on behalf of a
given End User of the Integrated Software, and will provide ongoing support as a
"first-tier" support provider for client and voice services. Lipstream will
support the End User directly during the term of the Initial Block for client
and voice services. Lipstream shall not be responsible for non-Lipstream related
End User technical issues.

     13.3 Renewal Block Term(s). During subsequent Renewal Block terms,
Lipstream shall be responsible for directly supporting the End User of the
Integrated Software in matters pertaining to the ongoing availability and
quality of Lipstream voice services. Quintus shall continue to support its End
Users directly in all other matters.

     13.4 SDK Support. Lipstream will provide ongoing technical support for the
SDK and agent downloadable Client to Quintus between 8:00am - 5:00pm PST,
Monday through Friday during the term of the Agreement.

14.  BRANDING

     14.1 Branding Requirement. Lipstream will receive text, icon, and/or logo
branding ("Voice by Lipstream") in any and all areas of the Lipstream voice
client functionality offering which become voice-enabled under the terms of
this agreement, as technically and practically feasible.

     14.2 Branding Exceptions. Lipstream will provide a list of branding
exceptions as Exhibit C to the Agreement. For any requests that fall outside of
Exhibit C, Quintus will contact Lipstream to (a) to determine if Lipstream and
Quintus agree that such an exception is acceptable, and (b) to cooperate in
good faith to agree upon what alternate method(s) may be devised to achieving
acceptable brand recognition for Quintus and the Lipstream Voice Service
offering.

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<PAGE>   10
15.  MISCELLANEOUS.

     15.1  Assignment. Neither this Agreement nor any rights under this
Agreement may be assigned or otherwise transferred by Quintus, in whole or in
part, without the prior written consent of Lipstream, which consent shall not
be unreasonably withheld, or whether voluntary or by operation of law,
including by way of sale of assets, merger or consolidation, without prior
written notification to Lipstream. Notwithstanding the foregoing, this
Agreement shall be binding upon and inure to the benefit of each party's
successors and assigns.

     15.2  Notices. All notices, demands or consents required or permitted
under this Agreement shall be in writing. Notice shall be considered delivered
and effective (a) when personally delivered; (b) the day following transmission
if sent by telex, telegram or facsimile followed by written confirmation by
registered overnight carrier or certified United States mail; (c) one (1) day
after posting when sent by registered private overnight carrier (e.g., DHL,
Federal Express, etc.); or (d) five (5) days after posting when sent by
certified United States mail. Notices shall be sent to the parties at the
addresses set forth on the first page of this Agreement or at such other
address as shall be given by either party to the other in writing.

     15.3  Publicity. Neither party will issue a press release or any other
announcement regarding this Agreement, or the relationship contemplated herein
unless both parties consent in writing, which consent shall not be unreasonably
withheld. Notwithstanding the foregoing, each party shall have the ability to
list the other party as a customer in its product literature and marketing
materials, including without limitation, on each party's website. In addition,
the parties agree to cooperate in issuing jointly approved press releases
concerning this Agreement, including without limitation an initial such release
within thirty (30) days after the Effective Date of this Agreement.

     15.4  Partial Invalidity. If any paragraph, provision, or clause in this
Agreement shall be found or be held to be invalid or unenforceable in any
jurisdiction in which this Agreement is being performed, the remainder of this
Agreement shall be valid and enforceable and the parties shall negotiate, in
good faith, a substitute, valid and enforceable provision which most nearly
effects the parties' intent in entering into this Agreement.

     15.5  Counterparts. This Agreement may be executed in two (2) or more
counterparts, all of which, taken together, shall be regarded as one and the
same instrument.

     15.6  Waiver and Amendment. No modification, amendment or waiver of any
provision of this Agreement shall be effective unless in writing and signed by
the party to be charged. The failure of either party to enforce at any time the
provisions of this Agreement shall in no way constitute a present or future
waiver of such provisions, nor in any way affect the right of either party to
enforce each and every such provision thereafter.

     15.7  Independent Contractors. The relationship of Lipstream and Quintus
established by this Agreement is that of independent contractors, and nothing
contained in this Agreement shall be construed to constitute the parties as
partners, joint venturers, co-owners or otherwise as participants in a joint or
common undertaking, or allow either party to create or assume any obligation on
behalf

                                       10
<PAGE>   11

of the other party. All financial obligations associated with a party's
business are the sole responsibility of such party.

     15.8 Governmental Approvals. Quintus represents and warrants that it will
obtain all required approvals of the government of any country outside the
United States in which it markets or distributes the Licensed Software in
connection with this Agreement.

     15.9 Governing Law. This Agreement shall be governed by and interpreted in
accordance with the laws of the State of California without reference to its
conflict of law principles and excluding the 1980 United Nations Convention on
Contracts for the International Sale of Goods.

     15.10 Jurisdiction; Venue. Any disputes under this Agreement shall be
subject to the exclusive jurisdiction and venue of the California State courts
and the Federal courts located in San Francisco County, California and the
parties hereby consent to the personal and exclusive jurisdiction and venue of
these courts.

     15.11 Force Majeure. Nonperformance of either party, except the payment of
money, shall be excused to the extent that performance is rendered impossible by
strike, fire, acts of God, governmental acts or orders or restrictions, failure
of suppliers, or any other reason where failure to perform is beyond the
reasonable control of and is not caused by the negligence of the non-performing
party.

     15.12 Entire Agreement. The terms and conditions herein contained,
including all Exhibits which are incorporated herein by reference, constitute
the entire agreement between the parties and supersedes all previous agreements
and understandings, whether oral or written, between the parties hereto with
respect to the subject matter hereof, and no agreement or understanding varying
or extending the same shall be binding upon either party hereto unless in a
written document signed by the party to be bound thereby.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
signed by duly authorized officers or representatives as of the date first
above written.

LIPSTREAM NETWORKS, INC.                QUINTUS CORPORATION

By: /s/ MATTHEW JONES                   By: /s/ MICHELLE E. FIELDS
    ---------------------------------       ---------------------------------

Name: Matthew Jones                     Name: Michelle E. Fields
      -------------------------------         -------------------------------

Title: CEO                              Title: Business Admin Manager
       ------------------------------          ------------------------------

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<PAGE>   12

                                   EXHIBIT A

                         SERVICES PROVIDED BY LIPSTREAM

1)   NETWORK SCALING & CAPACITY GOALS

     Provide for a voice service capacity that will support Services for
Quintus's End Users.

2)   SERVICE LOCATION PLAN

     a)   The services are to be hosted by Lipstream

3)   CLIENT LICENSE FROM LIPSTREAM TO END-USERS

     a)   The Client is available to End Users by download directly from
          Lipstream or through Quintus.

4)   LIPSTREAM CLIENT FEATURES

     a)   Interactive list of conference participants

     b)   Audio signal meter alongside of window to indicate spoken audio level

     c)   Self-adjusting microphone gain to normalize audio levels across
          participants

     d)   Signal meter to provide feedback to the End User on Internet traffic
          latency (i.e. whether the Internet is experiencing light or heavy
          traffic)

     e)   Status area on bottom of window

     f)   Visual indication of talking participants

     g)   Ability to ignore individual conference participants

     h)   Audio feedback on events, such as participant entry and exit

     i)   Instant text messaging ("Whispering")

     j)   Client is an ActiveX control and/or a Netscape plug-in

     k)   Client operates as an HTML object, and obeys size and location
          parameters. Possibilities include floating windows, frame-sets or
          placement (embed) within a Web page.

     l)   Target size of the Client is 150K including CODEC

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<PAGE>   13

      m) The Client will auto download and install on supported browsers
         [See Requirements]

      n) Joining a conference can be set to be either manual or automatic
         whereby the user is either prompted to enter their name or their name
         is automatically passed to the conference (no user entry required)

      o) Conference limits (i.e. the number of users in a conference) can be
         preset

      p) Implementation of TCP protocol fallback to better work with firewalls

5)    LIPSTREAM CLIENT REQUIREMENTS

      a) Network Connection: 28.8K kb or higher

      b) Processor: Pentium 90 MHz or faster

      c) Operating System: Windows 95, 98, or NT 4.0 [Macintosh support is not
         planned at this time]

      d) Browser: Microsoft Internet Explorer (supports auto-download and
         install), Version 3.02 or higher, Netscape Navigator, Version 3.0.4 or
         higher

      e) Sound Cards: Lipstream will support the widely available sound cards.
         Lipstream Engineering will continue to test and support well-known and
         new cards as they are released and will provide to Quintus a full list
         of supported sound cards as requested.

      f) An audio headset, or microphone and speakers/headphones

6)    LIPSTREAM PLANNED FUTURE FUNCTIONALITY

      a) Ability of Client to play a .wav file.

      b) Ability to run multiple instances of the Lipstream control on one
         computer.

                                       13
<PAGE>   14

                                   EXHIBIT B

                                 PRICING TERMS

1) Initial Block Fees:
Quintus will pay Lipstream the Initial Block fees in the amount of [*] per CSR.

2) Training Fees:
Fees for training shall be [*] per person, per session plus reasonable travel
and expenses and will be billed by Lipstream directly to End User.

[*] Certain information in this exhibit has been omitted and filed separately
    with the Commission. Confidential treatment has been requested with respect
    to the omitted portions.

                                       14
<PAGE>   15
                                   EXHIBIT C

             BRANDING EXCEPTION LIST (TO BE SUPPLIED BY LIPSTREAM)

                16. Exhibit C: Branding and Branding Exceptions

1.   Branding Guideline: As noted in Section 14, Company will receive text and
     logo branding ("Voice by Lipstream") in any and all areas of the Company
     voice client functionality offering which become voice-enabled under the
     terms of this Agreement. An example of such branding follows:

     [DIAGRAM]           Lipstream Client
                         Window

                         Inclusion of Text and Logo
                         attribution: "Voice by

     Figure A

2.   Branding Exceptions: Certain exceptions to the Branding Requirement
     specified in Section 14.1 are to be permitted without requirement for
     advance approval by the Company. Instead of the text and logo attribution
     depicted in Figure A, above, Customers may credit Lipstream for the
     provision of voice technology and service in the following ways:

     2.1  Inclusion of plain "Voice by Lipstream" text, in clearly-legible
          typeface of sufficient size to be legible from a standard
          computer-viewing distance, directly adjacent to the navigational
          elements by which an end-Customer (i.e., a visitor to a given Quintus
          Customer's website) might initiate a voice interaction with a Customer
          Service Representative.

                                       15
<PAGE>   16
                                   [DIAGRAM]

                                    Figure B

     2.2  Inclusion of the Lipstream logo, directly adjacent to the navigational
          elements by which an end-Customer (i.e., a visitor to a given Quintus
          Customer's website) might initiate a voice interaction with a Customer
          Service Representative.

                                       16
<PAGE>   17

                                   [GRAPHIC]

                                    Figure C

3.   Branding Escalations: Any and all additional Customer proposals entailing
     variances from the Branding Guideline and allowable Exceptions specified
     in Sections 1.0 and 2.0 of this Exhibit C shall be escalated to a
     qualifying member of the Company's Marketing staff for review prior to the
     granting of any approval for such variances.

                                       17
<PAGE>   18
                                   EXHIBIT D
                               LIPSTREAM SUPPORT

Title     QUINTUS TECHNICAL SUPPORT PLAN
Author    LIPSTREAM NETWORKS, INC.
Date      DATE
Revision  V1.0

I.  OBJECTIVE

This document defines terms and conditions by which Lipstream Networks, Inc.
will provide technical assistance in the use of the Lipstream Networks'
products by QUINTUS and QUINTUS' users.

Service will meet the following minimum delivery requirements:

<TABLE>
<CAPTION>
SERVICE                        AVAILABILITY  RESPONSE TIME+   RESPONSE TYPE
----------------------------   ------------  --------------   ------------------
<S>                            <C>           <C>               <C>
Business Hours Support         8am-6pm PST   1 hour           phone and/or email
--------------------------------------------------------------------------------
After Business Hours Support    6pm-8am PST  1 hour           phone
</TABLE>
--------------------------------------------------------------------------------
+ Actual resolution of incident may require additional time.

INCIDENT REPORTING & SUBMISSION

Incidents are to be submitted using one of the following mechanisms

Business Hours Support:

1. Via an automated, Web-based incident submission system provided by Lipstream
Networks at: http://support.lipstream.com

2. Via a phone call to Lipstream Technical Support Call Center at: 408-861-8233.

Each incident report should include the following information:

1. Platform information for end-user customer issues (per online submission
form).

After Business Hours Support:

1. Via a page to a Lipstream Technical Support Engineer at: 1-800-458-7073
or email to page.supportoncall(at)lipstream.com.

Email to the pager address triggers a page to the Technical Support engineer on
call. Please be sure to include your contract information.

o  INCIDENT REPORT RESPONSE & RESOLUTION (LIPSTREAM NETWORKS)

                                       18
<PAGE>   19
Lipstream Technical Support will respond within the specified response time.
The response can be either of the following:

1.  A phone call from a Lipstream Technical Support representative that either
resolves the issue or gathers the necessary information for further
investigation.

2.  Email from a Lipstream Technical Support representative that either
resolves the issue or gathers the necessary information for further
investigation.

After Lipstream Networks has completed a thorough investigation, each incident
will be categorized and the proper type of resolution applied, as defined by
Table 1 below:

TABLE 1

<TABLE>
<CAPTION>
INCIDENT TYPE                 RESOLUTION
---------------------------------------------------------------------------------------------
<S>                           <C>
End-use error                 Correct operational instructions are to be provided
---------------------------------------------------------------------------------------------
As designed                   Feature request may be submitted. Implementation will be at
                              the discretion of Lipstream Networks (see escalation process)
---------------------------------------------------------------------------------------------
Bug                           One of the following is to be provided:
                              1. Workaround, if available.
                              2. A fix in the next release of the software. A patch may be
                              provided if deemed necessary (see escalation process).
                              3. No fix.
---------------------------------------------------------------------------------------------
3rd-party incompatibility     Problems that are the result of 3rd-party software or hardware
                              incompatibilities and/or unsupported platforms (software and
                              hardware) will be closed; however, Lipstream may choose to
                              follow up with the 3rd-party directly to assist in resolving
                              any incompatibilities with Lipstream software.
---------------------------------------------------------------------------------------------
</TABLE>

Lipstream Technical Support will use best-effort to resolve all incidents.

IV. ESCALATION PROCEDURE

If the resolution to a specific incident does not satisfactorily resolve the
incident, the following procedure may be used to escalate an incident's
resolution:

o    Request a specific action such as:

     1.  Re-evaluation of incident by Lipstream Technical Support based on new
         information provided by QUINTUS and/or Quintus' end user.

     2.  Patch fix (for bug in product)

     3.  Feature request (for unsupported functionality)

                                      19

<PAGE>   20
o    The Technical Support Manager will review each request; once the review is
     complete, a conference call that includes appropriate QUINTUS and Lipstream
     personnel will be initiated to reach a mutually satisfying agreement.

                                      20
<PAGE>   21
                                   EXHIBIT E
                                 USAGE REPORTS

1.   QUINTUS WILL PROVIDE LIPSTREAM USAGE REPORTS CONTAINING THE TOTAL # OF NEW
     VOICE-ENABLED CSRs, BY CUSTOMER, WHENEVER QUINTUS AGREES TO PROVIDE SERVICE
     TO A NEW CUSTOMER, OR INCREASES SERVICE FOR AN EXISTING CUSTOMER.

2.   ON A MONTHLY BASIS LIPSTREAM WILL PROVIDE QUINTUS USAGE REPORTS CONTAINING
     THE FOLLOWING INFORMATION:

     a)   Simultaneous Users
          Monthly and daily graphs of peak, average, and minimum simultaneous
          users, by customer account

     b)   Usage Minutes
          Monthly graph of total usage minutes per day, by customer account

     c)   Session Length
          Monthly graph of average session length per user per day, by customer
          account

     d)   Conference Statistics
          Monthly graph of number of rooms (conferences) per day, and table of
          usage minutes and number of sessions for named rooms, by customer
          account

                                       21

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