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                                                                   Exhibit 10.16

                Form of Registrant's Software License Agreement

                           SOFTWARE LICENSE AGREEMENT

This Software License Agreement is entered into by and between Portal Software,
Inc, a Delaware corporation with principal offices located at 10200 South De
Anza Boulevard, Cupertino, California 95014 ("Portal") and
                                                           --------------------,
a                          corporation with principal offices located at
  ------------------------
                                      ("Licensee") and shall become effective on
-------------------------------------
the date it is signed by Portal ("Effective Date").

1     DEFINITIONS

The following terms shall have the meanings set forth below. Additional terms
may be defined on attached schedules. "Agreement" means this Software License
Agreement, including any and all attached Schedules, addenda amendments hereto
and Orders hereunder. "Application" means the scope of activity for which the
Licensed Software will be used as specified on the applicable attached Schedule
A. The Licensed Software will not be used for any other purpose or activity
outside of the designated Application without Portal's explicit prior written
consent. "CDR" means a call detail record, an event detail record or other
instance of data pertaining to an incoming or outgoing communication (such as
time, duration, identity or location of sender or recipient, etc.).
"Confidential Information" means this Agreement, and any and all software
(whether in object code or source code), user documentation, data, drawings,
benchmark tests, specifications, Documentation, release notes, trade secrets,
logins, passwords and other access codes and any other information disclosed by
one party to the other which is (i) conspicuously marked "confidential" or
"proprietary" if in tangible form, (ii) identified as "confidential" or
"proprietary" at the time of disclosure or (iii) any other information that,
when taking into consideration the circumstances surrounding disclosure of the
same, a reasonable person would determine to be of a confidential or proprietary
nature. "Delivery Date" means the date that Portal provides Licensee with a
working login and password sufficient to allow Licensee to download the Licensed
Software over the Internet from Portal's customer website (www.pin.com) or in
the case of products that are not distributed by electronic download, the date
on which Portal ships such products. "Designated Support Representatives" means
the primary technical support liaison and backup technical support liaison
designated by Licensee. Licensee may change its Designated Support
Representative by providing Portal with ten (10) days prior written notice. Each
Designated Support Representative shall attend the Licensed Software training
classes specified on Schedule A. "Documentation" means the installation
instructions and user manuals for the Licensed Software. "Licensed Software"
means collectively (i) the software products in executable form (object code)
that are designated on a Schedule A, (ii) Documentation, (iii) any source code
or object code provided to Licensee by Portal (including without limitation SDK
- software development kit - products) and (iv) Updates. Notwithstanding the
foregoing, for purposes of the sections of this Agreement titled "Support
Services" "Warranty", "Licensed Software" shall not include enhancements or
modifications of the Licensed Software products or Documentation not made
generally available to all licensees of the Licensed Software. "Licensed
Software Database" means the database (or linked databases) associated with the
Licensed Software within which the Customer Records are stored. "Licensor" means
the licensor or authorized distributor of a Third Party Product. "Major Release"
means a release version of the License Software that provides significant
additional functionality, improved performance or material changes to the
Documentation. Major Releases are represented by a release number X.Y (e.g.,
4.2, 5.0, 6.1). "Minor Release" means a release version of the Licensed Software
that does not provide significant additional functionality, improved performance
or material changes to the product or associated Documentation. Minor Releases
are represented by release numbers X.Y.Z (e.g., 4.2.1, 5.0.2, 6.1.3). "Order"
means the ordering document attached to this Agreement as Schedule B by which
Licensee may order additional Subscriber licenses, CDR licenses, software
product licenses or services. An Order shall become effective on the date it is
countersigned by Portal. "Restricted Release" means any version of the Licensed
Software marked alpha, beta or which is otherwise designated as a Restricted
Release. "Revenue" means all gross revenues derived directly or indirectly in
connection with the Application commencing from the Effective Date of the
applicable Schedule A. "Seagate Products" means the Seagate(R) Crystal
Reports(R) software products listed on Schedule A. The Seagate Products are
Third Party Products (defined below). "Seat" means the named or specified (by
password or other user identification) individuals authorized by Licensee to use
Seagate Products or the Developer Suite Software, regardless of whether the
individual is actively using the Seagate Products or the Developer Suite
Software at any given time. Licensee may replace authorized Seats as necessary
to reflect personnel changes provided that the number of individuals authorized
to use the Licensed Software does not exceed the maximum number of authorized
Seats at any time. Regardless of the number of Subscribers or other units
licensed, where a number of Seats is specified for certain Licensed Software,
that Licensed Software may only be used for that number of Seats specified on
the applicable Schedule A. Seats may include the employees of Licensee or third
parties; provided that such third party is limited to use of the Seagate
Software or the Developer Suite Software (i) only as configured and deployed by
Licensee, and (ii) solely in connection with Licensee's internal business
operations as conducted by or through such third party, including but not
limited to the installation, administration or implementation of the Licensed
Software for Licensee. Licensee agrees that it is responsible for ensuring that
any usage by its employees and any such third parties is in accordance with the
terms and conditions of this Agreement. "Subscriber" means an individual
customer record ("Customer Record") in a Licensed Software Database. A Customer
Record may be referred to as an "account object" or a "service object" in the
Licensed Software and Documentation. The types of Subscribers licensed by
Licensee under this Agreement for Licensed Software and their associated pricing
are set forth on the applicable Schedule A relating to such Licensed Software.
If the Licensed Software is used to authenticate, bill, rate or otherwise track
the activities of individual users within a corporate or group account
("Organizational Hierarchy"), each such individual user will be deemed a
separate "Subordinate Subscriber". Subordinate Subscribers will be appropriately
categorized into their applicable sub-class in accordance with the criteria set
forth on Schedule A. "Support Services" means the technical and maintenance
support for the Licensed Software purchased by Licensee as set forth on a
Schedule A. "Term" means the period of time specified on Schedule A, or if no
Term is specified on Schedule A, then the Term shall be deemed to be twenty four
(24) months commencing from the Effective Date. "Third Party Product" means a
software product that is owned or licensed by an entity other than Portal, which
entity has authorized Portal to sublicense its software product(s) with or
embedded within the Licensed Software. Third Party Products can only be used in
conjunction with the Portal Licensed Software to process data processed by the
Licensed Software. "Update" means a subsequent release of a Licensed Software
product that is generally made available to licensees of that Licensed Software
product at no additional charge. Updates do not include any release, option or
future product that Portal licenses separately from the Licensed Software.

2     LICENSE
2.1     Subject to the terms and conditions of this Agreement, Portal grants
Licensee a non-exclusive, nonsublicensable, nontransferable license to install
the Licensed Software specified on a Schedule A on one or more computers located
at the Production Site(s) set forth on that Schedule A and that share the same
Licensed Software Database for the Term and to use such Licensed Software only
for the Application and only for the number of Subscribers, CDRs, Seats or
copies or amount of Revenue licensed under that Schedule At.

2.2     Licensee may install one (1) copy of the Licensed Software on a
secondary non-production system for disaster recovery purposes only located at
the Backup Site location set forth on the applicable Schedule A. Licensee may
install one (1) copy of the Licensed Software at the Development Site location
set forth on the applicable Schedule A to be used solely for Licensee's internal
testing, training and development use. Licensee may make a reasonable number of
backup copies of the Licensed Software exclusively for inactive archival
purposes only. Except as set forth hereinabove, Licensee shall not reproduce
Licensed Software, in whole or in part. All titles, trademark symbols, copyright
symbols and legends, and other proprietary markings incorporated in, marked on,
or affixed to any Licensed Software must be reproduced on every copy of the
Licensed Software and shall not be removed or obliterated.

2.3     Licensee may modify the business policy facilities modules source code
provided by Portal however only in the manner set forth in the applicable
Documentation. Licensee is hereby granted a royalty free, perpetual,
nonexclusive license to use any such modifications only in conjunction with the
Licensed Software and subject to the same restrictions as the Licensed Software.
Notwithstanding the foregoing, Portal shall not be precluded from developing,
using, marketing, distributing, or otherwise exploiting modifications of the
business policy facilities modules source code developed by Portal.

2.4     Portal or its Licensors shall at all times retain ownership of the
Licensed Software including without limitation any and all intellectual property
rights therein and copies thereof.

2.5     Within five (5) business days of the applicable Schedule A Effective
Date Portal will provide Licensee with a login and password which will enable
Licensee to download one machine-readable copy of the applicable Licensed
Software from Portal's website or in the case of products that are not
distributed by electronic download, Portal will ship such products within five
(5) business days.

2.6     "Ancillary Programs" are software programs or functionality that Portal
distributes with or within the Licensed Software to facilitate interoperability
between the Licensed Software and other software products or functionality and
that Portal generally licenses separately and charges additional license and
Support Service fees. Licensee will not use such Ancillary Programs unless it
obtains a license therefor from Portal.

2.7     Except for the license rights expressly granted to Licensee in this
Agreement, Portal grants and Licensee receives no other rights or licenses to
the Licensed Software, derivative works thereof, or any intellectual property
rights related thereto, whether by implication, estoppel or otherwise.

3     DEVELOPER SUITE LICENSE
For each Developer Suite license Seat purchased by Licensee (as set forth on
Schedule A) Portal grants Licensee the right to install the Developer Suite
product(s) set forth on Schedule A (`the "Developer Suite Software") on a single
computer for use by a single

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designated individual for the sole purpose of designing, developing, testing and
adapting third party software products to operate in conjunction with the
Licensed Software.

4     LICENSE RESTRICTIONS
Licensee will not itself, or through any parent, subsidiary, affiliate, agent or
other third party sell, lease, license, sublicense, modify (except as expressly
permitted in the applicable Documentation or as explicitly authorized by Portal
in writing) or encumber the Licensed Software or any part thereof. Except to the
minimum extent necessary to comply with applicable law (and then only to the
minimum extent allowed under such law to achieve interoperability with other
independently created computer software programs), Licensee will not itself, or
through any parent, subsidiary, affiliate, agent or other third party decompile,
disassemble, or reverse engineer any portion of the Licensed Software or attempt
to discover any source code or underlying ideas or algorithms of any Licensed
Software. Except as otherwise explicitly provided in this Agreement, Licensee
will not use the Licensed Software to provide processing services to third
parties, commercial timesharing, rental or sharing arrangements, or on a
"service bureau" basis or otherwise use or allow others to use the Licensed
Software for the benefit of any third party. Licensee will use the Licensed
Software only for the Application and only for the number of Subscribers, CDRs,
Seats and/or copies licensed under this Agreement. Licensee will not provide,
disclose, divulge or make available to, or permit use of the Licensed Software
by persons other than Licensee's employees, contractors and agents who are under
a legally binding obligation of confidentiality consistent with the
confidentiality provisions of this Agreement. Licensee will not transport,
export, or re-export of the Licensed Software, in whole or in part in violation
of the import or export control laws or regulations of the United States or any
other applicable country.

5     LICENSE AND SUPPORT SERVICES FEES
Licensee will pay Portal the license, services and Support Services fees as set
forth on each Schedule A and applicable Order.

6     PAYMENTS AND TAXES
6.1     Invoices for amounts due under this Agreement shall be due and payable
on the date set forth in the relevant Schedule A or Order(s). If no date is
stated, payment shall be due thirty (30) calendar days from Licensee's receipt
of invoice.

6.2     All payments due under this Agreement shall be made in U.S. dollars. In
addition to any remedies Portal may have hereunder or at law, any payments more
than thirty (30) days overdue will bear a late payment fee of 1.5% per month
commencing from the payment due date. If the foregoing would not be enforceable
under applicable law, then the applicable late payment fee shall be an amount
equal to the maximum rate allowed by law, accruing from the payment due date.

6.3     Portal may suspend or terminate Support Services for non-payment
continuing for more than fifteen (15) calendar days after Licensee's receipt of
a written notice from Portal informing of the failure to pay when due. Portal
shall have no liability for damages sustained by Licensee resulting from such
termination or suspension of Support Services pursuant to this Section 6.3.

6.4     The amounts set forth in this Agreement and all Orders hereunder are
exclusive of all taxes (including without limitation, value added taxes and
withholding taxes), tariffs, duties and the like. If Portal is required to pay
any sales, use, value-added, withholding or other tax, tariff, duty, etc.,
(other than taxes on Portal's net income) on the licenses or services provided
pursuant to this Agreement or pertaining to Licensee's use of the Licensed
Software, then such taxes shall be billed to and paid by Licensee.

7     SUPPORT SERVICES
Provided Licensee has paid the applicable Support Services fees, Portal,
directly or through or its authorized agent, shall provide Licensee with
technical support services and or Updates for Licensed Software in accordance
with the Support Services plan purchased by Licensee as set forth on the
applicable Schedule A. Portal reserves the right to modify its Support Services
plans any time. Portal will notify Licensee in writing of any material
modifications to Portal's Support Services plans. Licensee shall designate one
primary technical support liaison and one backup technical support liaison who
will be permitted to contact Portal during applicable technical support services
hours. Portal will support each Major Release of the Licensed Software for at
least eighteen (18) months from its initial commercial release ("Support Term").
Portal shall have no obligation to support (i) Licensed Software which has been
damaged due to Licensee's negligence, abuse, or misapplication, (ii) Licensed
Software which has been modified or altered in a manner not expressly authorized
by Portal, (iii) problems caused by use of the Licensed Software other than in
accordance with the Documentation, or (iv) Licensed Software installed in an
operating environment or hardware platform other than that for which it has been
designed as set forth in the applicable Documentation. Licensee will reasonably
cooperate with Portal in the resolution of support issues and, upon Portal's
request and during normal business hours, shall provide Portal with remote
access to the equipment on which the Licensed Software is installed and/or
operating. Portal will abide by Licensee's security policies and procedures and
will only use such remote access to provide Support Services for the Licensed
Software. Licensee understands that failure to provide Portal with such remote
access may result in delayed resolution of Support Services issues. If Licensee
fails to provide Portal with the above described remote access, Portal shall
have no liability for damages arising from delays which could reasonably have
been avoided had Licensee provided Portal with above-described dial-in access.
Support Services for supported products will automatically renew at the same
support level (if available) unless terminated by Licensee or Portal at least
sixty (60) days prior to the expiration of the then current annual Support
Services period as otherwise permitted under this Agreement.

8     CONSULTING SERVICES
Subject to payment of the applicable fees, Portal will provide Licensee with the
Support Services, training services and Solution Services ("Solution Services")
set forth on each Schedule A. Additionally, Portal may from time to time provide
Licensed Software implementation or other professional consulting services
agreed to by both parties ("Consulting Services"). Prior to the scheduling of
such Consulting Services, Licensee and Portal will enter into a Professional
Services Agreement separate from this Agreement. Unless otherwise agreed in
writing, all Consulting Services will be billed on a time and materials basis.
Consulting Services are bid separately from the Licensed Software licenses, and
Licensee may acquire either Licensed Software licenses or Consulting Services
without acquiring the other.

9     RESTRICTED RELEASES
If Licensee is selected for participation and elects to participate in a
Restricted Release program, Licensee agrees (i) Portal shall have no obligation
to correct errors in or deliver updates to the Restricted Release, (ii) Portal
shall have no obligation to support the Restricted Release, (iii) Licensee will
provide Portal with appropriate test data for the Restricted Release if
necessary to resolve problems in the Restricted Release encountered by Licensee
and will promptly report to Portal any error discovered in the Restricted
Release, (iv) the Restricted Release is experimental, may contain problems and
errors and is being provided to Licensee on an "AS-IS" basis with no warranty of
any kind, express or implied, (v) neither party will be responsible to the other
for any losses, claims or damages of whatever nature, arising out of or in
connection with the performance or nonperformance of the Restricted Release,
(vi) Licensee will not use the Restricted Release in production applications
without the prior written approval of Portal, and (vii) Licensee will stop using
and return or destroy any Restricted Release promptly upon Portal's request.

10    TERMINATION
This Agreement shall come into effect on the Effective Date and shall remain in
effect until termination of this Agreement by either party as provided herein
below. Portal may terminate a license to a Licensed Software product if Licensee
fails to pay the license fee therefor within fifteen (15) calendar days after
written notice from Portal that payment is past due. Either party may terminate
this Agreement if the other party breaches a material term of this Agreement and
fails to cure such breach within sixty (60) calendar days after receipt of
written notice describing the breach in reasonable detail. Upon termination of
this Agreement, all licenses granted hereunder shall immediately terminate,
Licensee shall immediately cease using the Licensed Software and Documentation
and Licensee shall certify in writing to Portal that all copies (in any form or
media) have been destroyed or returned to Portal. Upon expiration of the Term of
any particular license granted under this Agreement, Licensee shall immediately
cease using the applicable Licensed Software and Documentation and Licensee
shall certify in writing to Portal that all copies (in any form or media) have
been destroyed or returned to Portal. Termination shall not relieve Licensee
from paying all amounts accrued under this Agreement prior to termination and
shall not limit either party from pursuing any other available remedies.
Sections 4, 5, 6, 10, 11, 13, 14, 15.1, 17, 18 and 19 shall survive termination
or expiration of this Agreement.

11    INFRINGEMENT INDEMNITY
Portal at its own expense shall (i) defend or at its option settle, any claim or
suit against Licensee on the basis of infringement of any trademark, copyright,
trade secret or United States patent ("Intellectual Property Rights") by the
Licensed Software or permitted use thereof, and (ii) pay any final judgment
entered against Licensee on such issue or any settlement thereof, provided (a)
Portal has sole control of the defense and/or settlement, (b) Licensee notifies
Portal promptly in writing of each such claim or suit and gives Portal all
information known to Licensee relating thereto, and (c) Licensee cooperates with
Portal in the settlement and/or defense. (Licensee shall be reimbursed for all
reasonable out-of-pocket expenses incurred in providing any cooperation
requested by Portal.) If all or any portion of the Licensed Software is, or in
the opinion of Portal may become, the subject for any claim or suit for
infringement of any Intellectual Property Rights, Portal may, and in the event
of any adjudication that the Licensed Software or any part thereof does infringe
or if the permitted use of the Licensed Software or any part thereof is
enjoined, Portal shall, at its expense do one of the following things: (1)
procure for Licensee the right to use the Licensed Software or the affected part
thereof; (2) replace the Licensed Software or affected part with other suitable
programs; (3) modify the Licensed Software or affected part to make it
non-infringing; or (4) if Portal reasonably determines that none of the
foregoing remedies are commercially feasible, refund the aggregate payments made
by Licensee for the Licensed Software or affected part thereof. Portal shall
have no obligations under this Section 11 to the extent a claim is based upon
(A) the use of any version of the Licensed Software other than a current,
unaltered version provided by Portal, if infringement would have been avoided by
a current unaltered version; or (B) combination, operation or use of the
Licensed Software with software and/or hardware not delivered by Portal if such
infringement could have been avoided by combination, operation or use of the
Licensed Software with other software and/or hardware. This Section 11 states
the entire liability of Portal and the exclusive remedy of Licensee with respect
to any alleged infringement by the Licensed Software or any part thereof.

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12    WARRANTY
12.1    For ninety (90) calendar days from the Effective Date of this Agreement
("Warranty Period") Portal warrants that the Licensed Software when properly
used will operate in all material respects with its Documentation. If Licensee
provides Portal with written notice during the Warranty Period that the Licensed
Software fails to operate as warranted in this Section 12.1, Portal will use
reasonable efforts to cure the defect and make the Licensed Software operate as
herein warranted. Licensee's sole remedy in the event of breach by Portal of
this Section 12.1 shall be (i) replacement of the defective Licensed Software
program or defective portion thereof or (ii) termination of the license for the
nonconforming Licensed Software product and refund of the license fees paid
therefor. Portal shall have no obligations under this Section 12.1 to the extent
noncompliance results from (a) modification of the Licensed Software not
authorized by Portal, or (b) use of the Licensed Software for a purpose or in a
manner other than that for which it was designed. This Section 12.1 states
Portal's entire liability and Licensee's exclusive remedy with respect to any
breach by Portal of this Section 12.1.

12.2    Portal warrants that any services (including without limitation Solution
Services, training, implementation workshop or Support Services) performed under
this Agreement will be performed in a professional workmanlike manner consistent
with prevailing industry practices.

13    WARRANTY DISCLAIMER
EXCEPT AS EXPLICITLY SET FORTH IN SECTIONS 11 AND 12 ABOVE, PORTAL AND ITS
LICENSORS MAKE NO WARRANTIES, WHETHER EXPRESS OR IMPLIED, OR STATUTORY REGARDING
OR RELATING TO THE LICENSED SOFTWARE OR THE DOCUMENTATION, OR ANY MATERIALS OR
SERVICES FURNISHED OR PROVIDED TO LICENSEE UNDER THIS AGREEMENT. SPECIFICALLY,
PORTAL DOES NOT WARRANT THAT THE LICENSED SOFTWARE WILL BE ERROR FREE OR WILL
PERFORM IN AN UNINTERRUPTED MANNER. TO THE MAXIMUM EXTENT ALLOWED BY LAW, PORTAL
SPECIFICALLY DISCLAIMS ALL IMPLIED WARRANTIES OF SATISFACTORY QUALITY,
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (EVEN IF PORTAL HAD BEEN
INFORMED OF SUCH PURPOSE) WITH RESPECT TO THE LICENSED SOFTWARE, DOCUMENTATION
AND SERVICES AND WITH RESPECT TO THE USE OF ANY OF THE FOREGOING.

14    LIMITATION OF LIABILITY
14.1    IN NO EVENT SHALL EITHER PARTY OR ITS LICENSORS BE LIABLE FOR ANY
INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES OR DAMAGES FOR LOSS OF
REVENUES OR PROFITS, LOSS OF USE, BUSINESS INTERRUPTION, LOSS OF DATA, WHETHER
IN AN ACTION IN CONTRACT OR TORT, EVEN IF THE OTHER PARTY HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES. EACH PARTY AGREES TO TAKE REASONABLE ACTION TO
MITIGATE ITS DAMAGES. LICENSEE AGREES TO REGULARLY BACK UP ITS DATABASE(S) IN
ACCORDANCE WITH REASONABLE INDUSTRY PRACTICES.

14.2    EXCEPT IN THE CASE OF A BREACH OF SECTION 4 (LICENSE RESTRICTIONS), 11
(INFRINGEMENT INDEMNITY) OR 17 (CONFIDENTIALITY) NEITHER PARTY'S OR ITS
LICENSORS' LIABILITY FOR ANY DAMAGES SHALL EXCEED AN AMOUNT EQUAL TO THE TOTAL
FEES PAID AND OWED TO PORTAL UNDER THIS AGREEMENT.

15    AUDIT RIGHTS/QUARTERLY REPORTS
15.1    Licensee shall keep and maintain full, accurate and detailed records
regarding its payment obligations, the licenses granted under this Agreement and
the number and types of Subscribers in the Licensed Software Database and/or the
number of CDRs processed. Portal may, at its expense, no more than once per
year, and on thirty (30) days prior written notice, audit Licensee's use of the
Licensed Software and compliance with this Agreement. Any such audits shall
occur during normal business hours and shall not unreasonably interfere with
Licensee's business operations. If any such audit reveals a deficiency in any
amounts due to Portal hereunder, Licensee will be invoiced for such underpaid
fees based on the Price List in effect at the time the audit is completed. If
the underpaid fees exceed five percent (5%) of the license fees paid, then
Licensee shall also pay Portal's reasonable costs of conducting the audit.
Audits shall be conducted no more than once annually.

15.2    Commencing ninety (90) calendar days from each applicable Licensed
Software Delivery Date, Licensee will provide Portal with quarterly reports
("License Compliance Reports") setting forth (i) the total numbers and types of
Subscribers in the Licensed Software Database if a number of Subscribers is
specified on the applicable Schedule A, (ii) the number of CDRs processed by the
Licensed Software, if a CDR limit is specified in the applicable Schedule A
(iii) Revenue for the applicable calendar quarter and the cumulative Revenue to
date commencing from the applicable Schedule A Effective Date if a Revenue limit
is specified in Schedule A or if fees are based on Revenue (iv) a statement of
any additional license and Support Services fees owed to Portal and a reasonable
summary of how such amounts were calculated, and (v) the then-current addresses
of all locations where the Licensed Software is installed. Within thirty (30)
days following the end of each calendar quarter the License Compliance Reports
shall be sent to Portal care of (or such other address as Portal may designate
in writing):

     License Compliance Division
     Portal Software, Inc.
     10200 South De Anza Boulevard
     Cupertino, CA 95014

16    ASSIGNMENT/BINDING AGREEMENT
Neither this Agreement nor any rights under this Agreement may be assigned or
otherwise transferred by Licensee (by operation of law or otherwise), in whole
or in part, including by way of merger, acquisition or sale of all or
substantially all of the assets in one or more related transactions, without
Portal's prior written consent.

17    CONFIDENTIALITY
Each Party acknowledges that the Confidential Information constitutes valuable
trade secrets and each party agrees that it shall use the Confidential
Information of the other party solely in accordance with the provisions of this
Agreement and it will not disclose, or permit to be disclosed, the same directly
or indirectly, to any third party without the other party's prior written
consent. Notwithstanding the foregoing, either party may disclose Confidential
Information, in whole or in part (i) to its employees, officers, directors,
Licensors and or subcontractors who have a reasonable need to know and are
legally bound to keep such information confidential by confidentiality
obligations consistent with those of this Agreement, (ii) to its financing
sources, auditors, attorneys, other agents, financial institutions, professional
advisors and/or substantial potential investors having a reasonable need to
know, having no reasonably anticipated conflict of interest with the other
Party, and under a contractual or professional duty to maintain the
confidentiality of the terms and conditions disclosed thereto. Each party agrees
to exercise due care in protecting the Confidential Information from
unauthorized use and disclosure. However, neither party bears any responsibility
for safeguarding any information that it can document in writing (a) is in the
public domain through no fault of its own, (b) was properly known to it, without
restriction, prior to disclosure by disclosing party, (c) was properly disclosed
to it, without restriction, by another person with the legal authority to do so,
(d) is independently developed by receiving party without use of or reference to
disclosing party's Confidential Information or (e) is required to be disclosed
pursuant to a judicial or legislative order or proceeding; provided that, to the
extent permitted by and practical under the circumstances, receiving party
provides to disclosing party prior notice of the intended disclosure and an
opportunity to respond or object to the disclosure or if prior notice is not
permitted or practical under the circumstances, prompt notice of such
disclosure. In the event of actual or threatened breach of the provisions of
Section 4 or Section 17, the non-breaching party will be entitled to seek
immediate injunctive and other equitable relief, without waiving any other
rights or remedies available to it.

18    NOTICE
Any notice required or permitted under the terms of this Agreement or required
by law must be in writing and must be (a) delivered in person, (b) sent by
registered mail, return receipt requested, (c) sent by overnight air courier, or
(d) by facsimile, in each case forwarded to the appropriate address set forth
above. Either party may change its address for notice by written notice to the
other party. Notices will be considered to have been given at the time of actual
delivery in person, three (3) business days after posting, or one (1) business
day after (i) delivery to an overnight air courier service or (ii) the moment of
transmission by facsimile.

19    MISCELLANEOUS
19.1    Neither party will incur any liability to the other on account of any
loss or damage resulting from any delay or failure to perform all or any part of
this Agreement if such delay or failure is caused, in whole or in part, by
events, occurrences, or causes beyond its control and without negligence of the
parties. Such events, occurrences or causes will include, without limitation,
acts of God, strikes, lockouts, riots, acts of war, earthquakes, fire and
explosions, but the ability to meet financial obligations is expressly excluded.

19.2    Any waiver of the provisions of this Agreement or of a party's rights or
remedies under this Agreement must be in writing to be effective. Failure,
neglect or delay by a party to enforce the provisions of this Agreement or its
rights or remedies at any time will not be construed to be deemed a waiver of
such party's rights under this Agreement and will not in any way affect the
validity of the whole or any part of this Agreement or prejudice such party's
right to take subsequent action.

19.3    If any term, condition or provision in this Agreement is found to be
invalid, unlawful or unenforceable to any extent, the parties shall endeavor in
good faith to agree to such amendments that will preserve, as far as possible,
the intentions expressed in this Agreement. If the parties fail to agree on such
an amendment, such invalid term, condition or provision will be severed from the
remaining terms, conditions and provisions, which will continue to be valid and
enforceable to the fullest extent permitted by law.

19.4    This Agreement (including the Schedules and any addenda hereto signed by
both parties) contains the entire agreement of the parties with respect to the
subject matter of this Agreement and supersedes all previous communications,
representations, understandings and agreements, either oral or written, between
the parties with respect to said subject matter. No employee, agent,
representative or affiliate of Portal has authority to bind Portal to any oral
representations or warranty concerning the Licensed Software. Any written
representation or warranty not expressly contained in this Agreement is
unenforceable. This Agreement may not be modified or amended except in writing
signed by a duly authorized representative of each party. No other act,
document, usage or custom shall be deemed to amend or modify this Agreement.

19.5    No terms, provisions or conditions of any purchase order,
acknowledgement or other business form that Licensee may use in connection with
the acquisition or licensing of the Licensed Software will have any effect on
the rights, duties or obligations of the parties

                                Confidential                        Page 3 of 7

<PAGE>

under, or otherwise modify, this Agreement, regardless of any failure of Portal
to object to such terms, provisions, or conditions.

19.6    The parties agree to reasonably cooperate in joint marketing and public
relations activities including without limitation the issuance of a joint press
release announcing Licensee's selection of the Portal solution and participation
in Portal's Success Stories program. Licensee's public relations personnel will
have an opportunity to review and approve the final draft of any joint public
relations materials before distribution to the press. Following successful
implementation of the Licensed Software and at Portal's request, Portal shall be
permitted to conduct a brief telephone interview (not to exceed thirty minutes
without Licensee's consent) with a senior-level spokesperson within Licensee's
organization involved with the implementation of the Portal solution. Portal may
write and publish a high-level success story profile based on the interview and
discussing the reasons supporting Licensee's choice of the Portal solution and
the benefits realized by Licensee. Licensee shall have final approval over the
final content of such literature prior to initial distribution by Portal. Except
as provided in this Agreement, neither party will engage in joint public
relations activities without the prior written consent of the other party, which
consent shall not be unreasonably withheld, conditioned or delayed.

19.7    Licensee agrees to be a reference account for Portal and will, at
Portal's request, participate in at least four (4) telephone reference inquiries
per year and at least one (1) onsite visit per year provided that Portal shall
give Licensee reasonable advance notice of not less than (i) 48 hours in the
case of a telephone reference visit and (ii) 7 days in the case of an onsite
visit. Further, Portal shall be permitted to identify Licensee as a customer on
its customer lists and investor calls.

19.8    This Agreement may be executed simultaneously in two (2) or more
counterparts, each of which will be considered an original, but all of which
together will constitute one and the same instrument. The exchange of a fully
executed Agreement (in counterparts or otherwise) by fax shall be sufficient to
bind the parties to the terms and conditions of this Agreement.

19.9    Portal is an independent contractor; nothing in this Agreement shall be
construed to create a partnership, joint venture or agency relationship between
the parties.

19.10   If this license is acquired under a U. S. Government contract, use,
duplication or disclosure by the U. S. Government is subject to restrictions set
forth in FAR subparagraphs 52.227-19(a)-(d) for civilian agency contracts and
DFARS 252.227-7013(c)(ii) for Department of Defense contracts. Portal reserves
all unpublished rights under United States copyright laws.

19.11   In the event that this Agreement or the licenses granted hereunder
should ever become subject to US bankruptcy proceedings, all rights and licenses
granted under or pursuant to this Agreement by Portal to Licensee are, and shall
otherwise be deemed to be, licenses of rights to "intellectual property" as
defined in Section 365(n) of the Bankruptcy Code (11 U.S.C. Section 101 et.
seq.). The parties agree that Licensee, as a licensee of such rights, shall
retain and may fully exercise all of the rights and election under Section
365(n) of the Bankruptcy Code. The parties further agree that, in the event that
any proceeding shall be instituted by or against Portal seeking to adjudicate it
bankrupt, or insolvent, or seeking liquidation, winding up, reorganization,
insolvency or reorganization, or relief of debtors, or seeking an entry of an
order of relief, or the appointment of a receiver, trustee or other similar
official for it or any substantial part of its property or it shall take any
action to authorize any of the foregoing actions, Licensee shall have the right
to retain and enforce its rights under this Agreement as provided under Section
365(n) of the Bankruptcy Code, including but not limited to, the right to
continue to use the Licensed Software in accordance with the terms and
conditions of this Agreement.

19.12   This Agreement will be interpreted and construed pursuant to the laws of
the State of California and the United States without regard to conflict of laws
provisions thereof, and without regard to the United Nations Convention on the
International Sale of Goods. Any legal action or proceeding relating to this
Agreement shall be instituted in a state or federal court in Santa Clara County,
California. Portal and Licensee agree to submit to the jurisdiction of, and
agree that venue is proper in, these courts in any such action or proceeding.

19.13   The prevailing party in any action to enforce this Agreement will be
entitled to recover its reasonable attorney's fees and costs in connection with
such action.

19.14   The provisions of this Agreement allocate the risks between Portal and
Licensee. Licensee's pricing reflects this allocation of risk and the limitation
of liability specified in this Agreement.

19.15   The parties have requested that this Agreement and all documents
contemplated hereby be drawn up in English.

IN WITNESS WHEREOF, the authorized representatives of the parties hereby bind
the parties by signing below:

-----------------------------------------------------
"Licensee"

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

Name:
     ------------------------------------------------

Title:
      -----------------------------------------------

Date:
     ------------------------------------------------

Portal Software, Inc.

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

Name:
     ------------------------------------------------

Title:
      -----------------------------------------------

Date:
     ------------------------------------------------

                                 Confidential                        Page 4 of 7

<PAGE>

                        Portal Proprietary & Confidential

                                   SCHEDULE A

This Schedule is made a part of the Software License Agreement dated as of
     , 2002 between Portal Software, Inc. ("Portal") and
-----                                                    --------------
("Licensee") (the Agreement"). This Schedule A shall become effective on the
date it is signed by Portal ("Schedule A Effective Date")

1       LICENSED SOFTWARE
-------------------------
The following Portal Software products and their associated online documentation
will be provided by Portal and will comprise the "Licensed Software":

1.1     As of the Schedule A Effective Date, the most recent generally
commercially available English language version of:

        o        Infranet Base System
        o        Infranet Brand Manager
        o        Infranet DNA
        o        Infranet MultiDB
        o        Infranet InterConnect
        o        Infranet Provision
        o        Infranet RADIUS Manager
        o        Infranet Email Manager
        o        Infranet Netflow Manager
        o        Infranet IPT Manager
        o        Infranet EAI Manager
        o        Infranet LDAP Manager
        o        Infranet GPRS Manager
        o        Infranet WAP Manager
        o        Infranet Taxation Connector (Vertex)
        o        Infranet Taxation Connector (Billsoft)
        o        Infranet Taxation Connector (Taxware)
        o        Infranet Vertex Quantum Manager
        o        Infranet OpenWave MAG Connector
        o        Infranet Payment Connector (PaymentTech)
        o        Infranet Payment Connector (Bertelsmann)
        o        Infranet Resource Reservation Framework
        o        Infranet Microsoft Exchange Connector
        o        Infranet Cable & Satellite
        o        Infranet Cable & Satellite Framework
        o        Infranet Broadband Manager
        o        Infranet Video Manager
        o        Infranet NDS Agent
        o        Infranet Content Connector
        o        Infranet Developer Suite & SDKs (1 user)
        o        Seagate Reports for Infranet consisting of one (1) Seat for
                 Seagate(R)Crystal Info Designer Add-in Tool and two (2) Seats
                 for Seagate Crystal Info Desktop Client
        o        Business Policy Facilities Modules Source Code

2       APPLICATION /TERM/LICENSE LIMITS

2.1     Application:                         [FOR REVENUE BASED DEALS -The
                     -----------------------
        Licensed Software shall not be used in connection with the provision
        of "no-fee" or "free" services for which Licensee does not charge
        access or usage fees.]

2.2     Term: [Perpetual] [     years from the Schedule A Effective Date]
                           ----

                                                                       Page A-5

<PAGE>

                       Portal Proprietary & Confidential

2.3     Initial License Limit: [         Subscribers] [         CDRs] [
                                --------               --------        --------
Transactions] [$         of Revenue per {year}{quarter}]
                --------
2.4     Subscriber Types:

2.5     Geographic Territory:

3        INSTALLATION SITES
---------------------------
3.1    Production Site:

3.2    Development Site:

3.3    Backup Site:

4      LICENSE AND MAINTENANCE SUPPORT SERVICE FEES
---------------------------------------------------

     4.1    Software License Fees

     [FOR REVENUE DEALS - LICENSEE WILL PAY PORTAL, QUARTERLY IN ARREARS IN
     ACCORDANCE WITH SECTION     OF THIS AGREEMENT ("QUARTERLY REPORTS") AN
                             ---
     AMOUNT EQUAL TO THREE PERCENT (3%) OF QUARTERLY REVENUES. THE FOREGOING
     AMOUNT SHALL BE EXCLUSIVE OF STANDARD LEVEL MAINTENANCE SUPPORT SERVICES.
     [WITHIN THIRTY (30) DAYS OF THE SCHEDULE A EFFECTIVE DATE LICENSE SHALL PAY
     PORTAL A PREPAYMENT IN THE AMOUNT OF                   DOLLARS ($        )
                                          -----------------           --------
     WHICH SHALL BE APPLIED AGAINST ITS FUTURE PAYMENT OBLIGATIONS UNDER THIS
     AGREEMENT.]

     4.2    Software License Fees

     The following table sets forth the license fees for use of the Licensed
     Software for the Application for the number of Subscribers set forth in
     Section 2.3 above.
-------------------------------------------------------------------------------
  Description                   License Fee                   Payment Due Date
--------------------------------------------------------------------------------
Licensed Software                    $
--------------------------------------------------------------------------------
Infranet InterConnect
--------------------------------------------------------------------------------
Infranet Provision
--------------------------------------------------------------------------------
Infranet Content Connector
--------------------------------------------------------------------------------

     4.3    Annual Gold Level Support Services Fees

     Portal will provide one year of Standard Level Maintenance Support Services
     from the Schedule A Effective Date for the number of Subscribers set forth
     in Section 2.3 above for the fee set forth below.

-------------------------------------------------------------------------------
  Description                   Annual Fee                    Payment Due Date
--------------------------------------------------------------------------------
Standard Level Support
Services                           $
--------------------------------------------------------------------------------

5      ADDITIONAL SUBSCRIBER LICENSE AND SUPPORT SERVICES FEES
-------------------------------------------------------------
     For one (1) year from the Schedule A Effective Date Licensee may purchase
     licenses to use the Licensed Software for the Application for additional
     Subscribers ("Additional Subscribers") for the amounts set forth below and
     by using the Order Form attached to this Agreement as Schedule B.
     Additional Subscribers must be licensed in the incremental blocks specified
     and not one at a time. Associated Annual Support Services fees are due when
     Additional Subscribers are licensed but will be prorated over the remainder
     of the annual Support Services term during which they are added.

--------------------------------------------------------------------------------
Subscriber Numbers   Subscribers in    License Fee per    Annual Support
                     Block             Block              Services Fee Per Block
--------------------------------------------------------------------------------

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

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

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

                                                                       Page A-6

<PAGE>

                       Portal Proprietary & Confidential

6      TRAINING
---------------
     Portal will provide training in accordance with attached Schedule     .
                                                                       ----
     Training fees shall be due and payable within thirty (30) days of the
     Schedule A Effective Date. Such training must be utilized within twelve
     (12) months of the Schedule A Effective Date.

7      SOLUTION SERVICES
------------------------
     Portal will provide      [hours/days] (in blocks of 8 hours per day) of
                         ----
     Solution Services in accordance with attached Schedule     for a fee of
                                                            ---
                     ($      ), (plus actual and reasonable travel and expenses)
     ---------------   ------
     due and payable within thirty (30) days of the Schedule A Effective Date.
     Solution Services must be utilized within twelve (12) months of the
     Schedule A Effective Date.

Portal Software, Inc.
"Portal"                                "Licensee"

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

Name:                                   Name:
     -----------------------------------     -----------------------------------

Title:                                  Title:
      ----------------------------------      ----------------------------------

Date:                                   Date:
     -----------------------------------     -----------------------------------

                                                                       Page A-7<PAGE>

                                                                   Exhibit 10.18

                             PORTAL SOFTWARE, INC.
                2000 INTERNATIONAL EMPLOYEE STOCK PURCHASE PLAN
                ------------------------------------------------
                     (as amended through February 1, 2002)

     I.    PURPOSE OF THE PLAN

           This International Employee Stock Purchase Plan is intended to
promote the interests of Portal Software, Inc., a Delaware Corporation, by
providing eligible employees of the Corporation's Foreign Subsidiaries with the
opportunity to acquire a proprietary interest in the Corporation through the
purchase of shares of Common Stock at periodic intervals.

           Capitalized terms herein shall have the meanings assigned to such
terms in the attached Appendix.

           All share numbers in the document reflect the 3-for-1 split of the
Common Stock authorized by the Board in April 1999 and approved by the
shareholders in April 1999 and the 2-for-1 split of the Common Stock effected on
January 19, 2000.

     II.   ADMINISTRATION OF THE PLAN

           The Plan Administrator shall have full authority to interpret and
construe any provision of the Plan and to adopt such rules and regulations for
administering the Plan as it may deem necessary. Decisions of the Plan
Administrator shall be final and binding on all parties having an interest in
the Plan.

     III.  STOCK SUBJECT TO PLAN

           A. The stock purchasable under the Plan shall be shares of authorized
but unissued or reacquired Common Stock, including shares of Common Stock
purchased on the open market. The number of shares of Common Stock reserved for
issuance over the term of the Plan and the U.S. Plan shall be limited to
12,677,789 shares, less any shares issued under the U.S. Plan. Such reserve
consists of (i) 5,738,293 shares initially reserved for purchase as of the
Effective Time, plus (ii) an additional 3,426,888 share increase effected
February 2001 pursuant to Section III.B. below plus (iii) an additional
3,512,608 share increase effected February 2002 pursuant to Section III.B.
below.

           B. The number of shares of Common Stock available for issuance under
 the Plan and the U.S. Plan in the aggregate shall automatically increase on the
first trading day of February each year during the term of the Plan, beginning
February 1, 2001, by an amount equal to two percent (2%) of the total number of
shares of Common Stock outstanding on the last trading day of the immediately
preceding January, but in no event shall any such annual increase exceed
4,000,000 shares.

           C. Should any change be made to the Common Stock by reason of any
stock split, stock dividend, recapitalization, combination of shares, exchange
of shares or other change affecting the outstanding Common Stock as a class
without the Corporation's receipt of consideration, appropriate adjustments
shall be made to (i) the maximum number and class of securities issuable under
the Plan and the U.S. Plan, (ii) the maximum number and class of

<PAGE>

securities purchasable per Participant on any one Purchase Date, (iii) the
maximum number and class of securities purchasable by all Participants in the
aggregate on any one Purchase Date (iv) the number and class of securities and
the price per share in effect under each outstanding purchase right in order to
prevent the dilution or enlargement of benefits thereunder and (v) the maximum
number and/or class of securities by which the share reserve is to increase
automatically each calendar year pursuant to the provisions of Section III.B.

     IV.   OFFERING PERIODS

           A. Shares of Common Stock shall be offered for purchase under the
Plan through a series of successive offering periods until such time as (i) the
maximum number of shares of Common Stock available for issuance under the Plan
shall have been purchased or (ii) the Plan shall have been sooner terminated.

           B. Each offering period shall be of such duration (not to exceed
twenty-four (24) months) as determined by the Plan Administrator prior to the
start date of that offering period. However, the initial offering period shall
commence at the Effective Time and terminate on the last business day in May
2001. The next offering period shall commence on the first business day in June
2001, and subsequent offering periods shall commence as designated by the Plan
Administrator.

           C. Each offering period shall be comprised of a series of one or more
successive Purchase Intervals. Purchase Intervals shall run from the first
business day in June to the last business day in November each year and from the
first business day in December each year to the last business day in May in the
following year.

           D. Should the Fair Market Value per share of Common Stock on any
Purchase Date within an offering period be less than the Fair Market Value per
share of Common Stock on the start date of that offering period, then that
offering period shall automatically terminate immediately after the purchase of
shares of Common Stock on such Purchase Date, and a new offering period shall
commence on the next business day following such Purchase Date. The new offering
period shall have a duration of twenty (24) months, unless a shorter duration is
established by the Plan Administrator within five (5) business days following
the start date of that offering period.

     V.    ELIGIBILITY

           A. Each individual who is an Eligible Employee on the start date of
any offering period under the Plan may enter that offering period on such start
date or on any subsequent Semi-Annual Entry Date within that offering period,
provided he or she remains an Eligible Employee.

           B. Each individual who first becomes an Eligible Employee after the
start date of an offering period may enter that offering period on any
subsequent Semi-Annual Entry Date within that offering period on which he or she
is an Eligible Employee.

           C. The date an individual enters an offering period shall be
designated his or her Entry Date for purposes of that offering period.

                                       2.

<PAGE>

           D. To participate in the Plan for a particular offering period, the
Eligible Employee must complete the enrollment forms prescribed by the Plan
Administrator (including a stock purchase agreement and a payroll deduction
authorization) and file such forms with the Plan Administrator (or its
designate) on or before his or her scheduled Entry Date.

     VI.   PAYROLL DEDUCTIONS

           A. Except to the extent otherwise provided in the Plan (or any
addendum thereto) or authorized by the Plan Administrator, the purchase price
for the shares of Common Stock acquired under the Plan shall be paid from
accumulated payroll deductions authorized by the Participant.

           B. The payroll deduction authorized by the Participant for purposes
of acquiring shares of Common Stock during an offering period may be any
multiple of one percent (1%) of the Cash Earnings paid to the Participant during
each Purchase Interval within that offering period, up to a maximum of fifteen
percent (15%). The deduction rate so authorized shall continue in effect
throughout the offering period, except to the extent such rate is changed in
accordance with the following guidelines:

                    (i)    The Participant may, at any time during the offering
           period, reduce his or her rate of payroll deduction to become
           effective as soon as possible after filing the appropriate form with
           the Plan Administrator. The Participant may not, however, effect more
           than one (1) such reduction per Purchase Interval.

                    (ii)   The Participant may, prior to the commencement of any
           new Purchase Interval within the offering period, increase the rate
           of his or her payroll deduction by filing the appropriate form with
           the Plan Administrator. The new rate (which may not exceed the
           fifteen percent (15%) maximum) shall become effective on the start
           date of the first Purchase Interval following the filing of such
           form.

           C. The payroll deduction authorized by the Participant shall be
collected in the currency in which paid by the Foreign Subsidiary. The payroll
deductions collected during each Purchase Interval shall be converted into U.S.
Dollars on the Purchase Date for that Purchase Interval on the basis of the
exchange rate in effect on the day before such Purchase Date. The Plan
Administrator shall have the absolute discretion to determine the applicable
exchange rate to be in effect for each Purchase Date by any reasonable method
which may be based on the exchange rate actually available in the ordinary
course of business on such date. Any changes or fluctuations in the exchange
rate at which the payroll deductions collected on the Participant's behalf are
converted into U.S. Dollars on each Purchase Date shall be borne solely by the
Participant.

                                       3.

<PAGE>

           D. Payroll deductions shall begin on the first pay day
administratively feasible following the Participant's Entry Date into the
offering period and shall (unless sooner terminated by the Participant) continue
through the pay day ending with or immediately prior to the last day of that
offering period. The amounts so collected shall be credited to the Participant's
book account under the Plan, initially in the currency in which paid by the
Foreign Subsidiary until converted into U.S. dollars on the Purchase Date.
Except to the extent otherwise provided by the Plan (including any addendum
thereto) or by the Plan Administrator, (i) no interest shall be paid on the
balance from time to time outstanding in such account, and (ii) the amounts
collected from the Participant shall not be required to be held in any
segregated account or trust fund and may be commingled with the general assets
of the Corporation and used for general corporate purposes.

           E. Payroll deductions shall automatically cease upon the termination
of the Participant's purchase right in accordance with the provisions of the
Plan.

           F. The Participant's acquisition of Common Stock under the Plan on
any Purchase Date shall neither limit nor require the Participant's acquisition
of Common Stock on any subsequent Purchase Date, whether within the same or a
different offering period.

     VII.  PURCHASE RIGHTS

           A. Grant of Purchase Right. A Participant shall be granted a separate
              -----------------------
purchase right for each offering period in which he or she participates. The
purchase right shall be granted on the Participant's Entry Date into the
offering period and shall provide the Participant with the right to purchase
shares of Common Stock, in a series of successive installments over the
remainder of such offering period, upon the terms set forth below. The
Participant shall execute a stock purchase agreement embodying such terms and
such other provisions (not inconsistent with the Plan) as the Plan Administrator
may deem advisable.

           Under no circumstances shall purchase rights be granted under the
Plan to any Eligible Employee if such individual would, immediately after the
grant, own (within the meaning of Code Section 424(d)) or hold outstanding
options or other rights to purchase, stock possessing five percent (5%) or more
of the total combined voting power or value of all classes of stock of the
Corporation or any Corporate Affiliate.

           B. Exercise of the Purchase Right. Each purchase right shall be
              ------------------------------
automatically exercised in installments on each successive Purchase Date within
the offering period, and shares of Common Stock shall accordingly be purchased
on behalf of each Participant on each such Purchase Date. The purchase shall be
effected by applying the Participant's payroll deductions for the Purchase
Interval ending on such Purchase Date, as converted into U.S. Dollars, to the
purchase of whole shares of Common Stock at the U.S. Dollar purchase price in
effect for the Participant for that Purchase Date.

                                       4.

<PAGE>

           C. Purchase Price. The U.S. Dollar purchase price per share at which
              --------------
Common Stock will be purchased on the Participant's behalf on each Purchase Date
within the offering period shall be equal to eighty-five percent (85%) of the
lower of (i) the Fair Market Value per share of Common Stock on the
-----
Participant's Entry Date into that offering period or (ii) the Fair Market Value
per share of Common Stock on that Purchase Date.

           D. Number of Purchasable Shares. The number of shares of Common Stock
              ----------------------------
purchasable by a Participant on each Purchase Date during the offering period
shall be the number of whole shares obtained by dividing the amount collected
from the Participant through payroll deductions during the Purchase Interval
ending with that Purchase Date, as converted into U.S. Dollars, by the U.S.
Dollar purchase price in effect for the Participant for that Purchase Date.
However, the maximum number of shares of Common Stock purchasable per
Participant on any one Purchase Date shall not exceed three thousand five
hundred (3,500) shares, subject to periodic adjustments in the event of certain
changes in the Corporation's capitalization. In addition, the maximum aggregate
number of shares of Common Stock purchasable by all Participants on any one
Purchase Date under the Plan and the U.S. Plan shall not exceed one million two
hundred thousand (1,200,000) shares, subject to periodic adjustments in the
event of certain changes in the Corporation's capitalization. However, the Plan
Administrator shall have the discretionary authority, exercisable prior to the
start of any offering period under the Plan, to increase or decrease the
limitations to be in effect for the number of shares purchasable per Participant
and in the aggregate by all Participants on each Purchase Date during that
offering period.

           E. Excess Payroll Deductions. Any payroll deductions not applied to
              -------------------------
the purchase of shares of Common Stock on any Purchase Date because they are not
sufficient to purchase a whole share of Common Stock shall be held for the
purchase of Common Stock on the next Purchase Date. However, any payroll
deductions not applied to the purchase of Common Stock by reason of the
limitation on the maximum number of shares purchasable per Participant or in the
aggregate on the Purchase Date shall be promptly refunded in the currency in
which collected by the Foreign Subsidiary.

           F. Termination of Purchase Right. The following provisions shall
              -----------------------------
govern the termination of outstanding purchase rights:

                    (i)    A Participant may, at any time prior to the date 5
           days preceding the next scheduled Purchase Date in the offering
           period, terminate his or her outstanding purchase right by filing the
           appropriate form with the Plan Administrator (or its designate), and
           no further payroll deductions shall be collected from the Participant
           with respect to the terminated purchase right. Any payroll deductions
           collected during the Purchase Interval in which such termination
           occurs shall, at the Participant's election, be immediately refunded
           in the currency in which collected by the Foreign Subsidiary or held
           for the purchase of shares on the next Purchase Date. If no such
           election is made at the time such purchase right is terminated, then
           the payroll deductions collected with respect to

                                       5.

<PAGE>

           the terminated right shall be refunded as soon as possible in the
           currency in which collected by the Foreign Subsidiary.

                    (ii)   The termination of such purchase right shall be
           irrevocable, and the Participant may not resume participation in the
           offering period for which the terminated purchase right was granted
           unless he or she re-enrolls in the Plan (by making a timely filing of
           the prescribed enrollment forms) on or before a regularly-scheduled
           Entry Date into that offering period. In such event, the Participant
           shall be granted a new purchase right with a new purchase price based
           upon the Fair Market Value per share on Common Stock on his or her
           new Entry Date.

                    (iii)  Should the Participant cease to remain an Eligible
           Employee for any reason (including death, disability or change in
           status) while his or her purchase right remains outstanding, then
           that purchase right shall immediately terminate, and all of the
           Participant's payroll deductions for the Purchase Interval in which
           the purchase right so terminates shall be immediately refunded in the
           currency in which collected by the Foreign Subsidiary. However,
           should the Participant cease to remain in active service by reason of
           an approved unpaid leave of absence, then the Participant shall have
           the right, exercisable up until the last business day of the Purchase
           Interval in which such leave commences, to (a) withdraw all the
           payroll deductions collected to date on his or her behalf for that
           Purchase Interval or (b) have such funds held for the purchase of
           shares on his or her behalf on the next scheduled Purchase Date. In
           no event, however, shall any further payroll deductions be collected
           on the Participant's behalf during such leave. Upon the Participant's
           return to active service (x) within ninety (90) days following the
           commencement of such leave or (y) prior to the expiration of any
           longer period for which such Participant's right to reemployment with
           the Corporation is guaranteed by either statute or contract, his or
           her payroll deductions under the Plan shall automatically resume at
           the rate in effect at the time the leave began, unless the
           Participant withdraws from the Plan prior to his or her return. An
           individual who returns to active employment following a leave of
           absence which exceeds in duration the applicable (x) or (y) time
           period will be treated as a new Employee for purposes of subsequent
           participation in the Plan and must accordingly re-enroll in the Plan
           (by making a timely filing of the prescribed enrollment forms) on or
           before his or her scheduled Entry Date into the offering period.

           G. Transfer of Employment. In the event that a Participant who is an
              ----------------------
Employee of a Foreign Subsidiary is transferred and becomes an Employee of the
Corporation during a Purchase Interval under the Plan, such individual shall
continue to remain a Participant in the Plan and payroll deductions shall
continue to be collected until the next Purchase Date as if the Participant had
remained an Employee of the Foreign Subsidiary.

           In the event that an Employee of the Corporation who is a participant
in the U.S. Plan is transferred and becomes an Employee of a Foreign Subsidiary
during a Purchase Interval in effect under the U.S. Plan, such individual shall
automatically become a Participant under the

                                       6.

<PAGE>

Plan for the duration of the offering period in effect at that time under the
Plan and the balance in such individual's book account maintained under the U.S.
Plan shall be transferred as a balance to a book account opened for such
individual under the Plan. Such balance, together with all other payroll
deductions collected from such individual by the Foreign Subsidiary for the
remainder of the Purchase Interval under the Plan (as converted into U.S.
Dollars), shall be applied on the next Purchase Date to the purchase of shares
under the Plan.

           H. Change in Control. Each outstanding purchase right shall
              -----------------
automatically be exercised, immediately prior to the effective date of any
Change in Control, by applying the payroll deductions of each Participant for
the Purchase Interval in which such Change in Control occurs to the purchase of
whole shares of Common Stock at a purchase price per share equal to eighty-five
percent (85%) of the lower of (i) the Fair Market Value per share of Common
Stock on the Participant's Entry Date into the offering period in which such
Change in Control occurs or (ii) the Fair Market Value per share of Common Stock
immediately prior to the effective date of such Change in Control. However, the
applicable limitation on the number of shares of Common Stock purchasable per
Participant shall continue to apply to any such purchase, but not the limitation
applicable to the maximum number of shares of Common Stock purchasable in the
aggregate. Payroll deductions not yet converted into U.S. Dollars at the time of
the Change in Control shall be converted from the currency in which paid by the
Foreign Subsidiary into U.S. Dollars on the basis of the exchange rate in effect
at as determined by the Plan Administrator at the time of the Change in Control.

           The Corporation shall use its best efforts to provide at least ten
(10)-days prior written notice of the occurrence of any Change in Control, and
Participants shall, following the receipt of such notice, have the right to
terminate their outstanding purchase rights prior to the effective date of the
Change in Control.

           I. Proration of Purchase Rights. Should the total number of shares of
              ----------------------------
Common Stock to be purchased pursuant to outstanding purchase rights on any
particular date exceed the number of shares then available for issuance under
the Plan and the U.S. Plan, the Plan Administrator shall make a pro-rata
allocation of the available shares on a uniform and nondiscriminatory basis, and
the payroll deductions of each Participant and each participant in the U.S.
Plan, to the extent in excess of the aggregate purchase price payable for the
Common Stock pro-rated to such individual, shall be refunded.

           J. Assignability. The purchase right shall be exercisable only by the
              -------------
Participant and shall not be assignable or transferable by the Participant.

           K. Stockholder Rights. A Participant shall have no stockholder rights
              ------------------
with respect to the shares subject to his or her outstanding purchase right
until the shares are purchased on the Participant's behalf in accordance with
the provisions of the Plan and the Participant has become a holder of record of
the purchased shares.

     VIII. ACCRUAL LIMITATIONS

           A. No Participant shall be entitled to accrue rights to acquire
Common Stock pursuant to any purchase right outstanding under this Plan if and
to the extent such accrual, when

                                       7.

<PAGE>

aggregated with (i) rights to purchase Common Stock accrued under any other
purchase right granted under this Plan and (ii) similar rights accrued under
other International Employee Stock Purchase Plans (within the meaning of Code
Section 423) of the Corporation or any Corporate Affiliate, would otherwise
permit such Participant to purchase more than Twenty-Five Thousand U.S. Dollars
(U.S. $25,000.00) worth of stock of the Corporation or any Corporate Affiliate
(determined on the basis of the Fair Market Value per share on the date or dates
such rights are granted) for each calendar year such rights are at any time
outstanding.

           B. For purposes of applying such accrual limitations to the purchase
rights granted under the Plan, the following provisions shall be in effect:

                    (i)    The right to acquire Common Stock under each
           outstanding purchase right shall accrue in a series of installments
           on each successive Purchase Date during the offering period on which
           such right remains outstanding.

                    (ii)   No right to acquire Common Stock under any
           outstanding purchase right shall accrue to the extent the Participant
           has already accrued in the same calendar year the right to acquire
           Common Stock under one (1) or more other purchase rights at a rate
           equal to Twenty-Five Thousand U.S. Dollars (U.S. $25,000.00) worth of
           Common Stock (determined on the basis of the Fair Market Value per
           share on the date or dates of grant) for each calendar year such
           rights were at any time outstanding.

           C. If by reason of such accrual limitations, any purchase right of a
Participant does not accrue for a particular Purchase Interval, then the payroll
deductions which the Participant made during that Purchase Interval with respect
to such purchase right shall be promptly refunded.

           D. In the event there is any conflict between the provisions of this
Article and one or more provisions of the Plan or any instrument issued
thereunder, the provisions of this Article shall be controlling.

     IX.   EFFECTIVE DATE AND TERM OF THE PLAN

           A. The Plan was adopted by the Board on June 13, 2000 and shall
become effective at the Effective Time, provided no purchase rights granted
                                        --------
under the Plan shall be exercised, and no shares of Common Stock shall be issued
hereunder until the Corporation shall have complied with all applicable
requirements of the 1933 Act (including the registration of the shares of Common
Stock issuable under the Plan on a Form S-8 registration statement filed with
the Securities and Exchange Commission), all applicable listing requirements of
any stock exchange (or the Nasdaq National Market, if applicable) on which the
Common Stock is listed for trading and all other applicable requirements
established by law or regulation.

           B. Unless sooner terminated by the Board, the Plan shall terminate
upon the earliest of (i) the last business day in May, 2009, (ii) the date on
         --------
which all shares available for issuance under the Plan shall have been sold
pursuant to purchase rights exercised under the Plan or (iii) the date on which
all purchase rights are exercised in connection with a Corporate

                                       8.

<PAGE>

Transaction. No further purchase rights shall be granted or exercised, and no
further payroll deductions shall be collected, under the Plan following such
termination.

     X.    AMENDMENT OF THE PLAN

           A. The Board may alter, amend, suspend or terminate the Plan at any
time to become effective immediately following the close of any Purchase
Interval. However, the Plan may be amended or terminated immediately upon Board
action, if and to the extent necessary to assure that the Corporation will not
recognize, for financial reporting purposes, any compensation expense in
connection with the shares of Common Stock offered for purchase under the Plan,
should the financial accounting rules applicable to the Plan at the Effective
Time be subsequently revised so as to require the recognition of compensation
expense in the absence of such amendment or termination.

           B. In no event may the Board effect any of the following amendments
or revisions to the Plan without the approval of the Corporation's stockholders:
(i) increase the number of shares of Common Stock issuable under the Plan,
except for permissible adjustments in the event of certain changes in the
Corporation's capitalization, (ii) alter the purchase price formula so as to
reduce the purchase price payable for the shares of Common Stock purchasable
under the Plan or (iii) modify the eligibility requirements for participation in
the Plan.

     XI.   GENERAL PROVISIONS

           A. All costs and expenses incurred in the administration of the Plan
shall be paid by the Corporation; however, each Plan Participant shall bear all
costs and expenses incurred by such individual in the sale or other disposition
of any shares purchased under the Plan.

           B. Nothing in the Plan shall confer upon the Participant any right to
continue in the employ of the Corporation or any Corporate Affiliate for any
period of specific duration or interfere with or otherwise restrict in any way
the rights of the Corporation (or any Corporate Affiliate employing such person)
or of the Participant, which rights are hereby expressly reserved by each, to
terminate such person's employment at any time for any reason, with or without
cause.

           C. Except to the extent otherwise provided in any addendum to the
Plan, the provisions of the Plan shall be governed by the laws of the State of
California without resort to that State's conflict-of-laws rules.

           D. A Foreign Subsidiary or the Corporation, as the case may be, shall
have the right to deduct from any payment to be made under this Plan, or to
otherwise require, prior to the issuance or delivery of any shares of Common
Stock or the payment of any cash, payment by each Participant, of any tax
required by applicable law to be withheld.

           E. Additional provisions for individual Foreign Subsidiaries may be
incorporated in one or more Addenda to the Plan. Such Addenda shall have full
force and effect with respect to the Foreign Subsidiaries to which they apply.
In the event of a conflict between

                                       9.

<PAGE>

the provisions of such an Addendum and one or more other provisions of the Plan,
the provisions of the Addendum shall be controlling.

                                       10.

<PAGE>

                                   Schedule A
                                   ----------

                         Corporations Participating in
                   International Employee Stock Purchase Plan

Portal Software Argentina S.R.L.
Portal Software International Pty Limited
Portal Software (Europe) Limited
Portal Software Canada Inc.
Portal Software France
Portal Software Germany GmbH
Portal Software (Hamburg) GmbH
42 Consulting-Group GmbH
Portal Software (Asia Pacific) Limited
Portal Software Italia S.r.l.
Portal Software Japan K.K.
Portal Software Mexico, S. de R.L. de C.V.
Portal Software Netherlands B.V.
Portal Software Korea Limited Company
Portal Software Informatica S.L.
Portal Software Sweden AB
Solution 42 Iberica S.L
Portal Software International Sarl
Portal Software Taiwan Limited

<PAGE>

                                    APPENDIX
                                    --------

           The following definitions shall be in effect under the Plan:

           A. Board shall mean the Corporation's Board of Directors.
              -----

           B. Cash Earnings shall mean the (i) regular base salary paid to a
              -------------
Participant by one or more Foreign Subsidiaries during such individual's period
of participation in one or more offering periods under the Plan plus (ii) all
overtime payments, bonuses, profit-sharing distributions and other
incentive-type payments received during such period. Such Cash Earnings shall be
calculated before deduction of (A) any income or employment tax withholdings or
(B) any and all contributions made by the Participant to any salary deferral
plan now or hereafter established by the Corporation or any Corporate Affiliate.
However, Cash Earnings shall not include any contributions made on the
Participant's behalf by the Corporation or any Corporate Affiliate to any
employee benefit or welfare plan now or hereafter established.

           C. Change in Control shall mean a change in ownership of the
              -----------------
Corporation pursuant to any of the following transactions:

                    (i)    a merger or consolidation in which securities
           possessing more than fifty percent (50%) of the total combined voting
           power of the Corporation's outstanding securities are transferred to
           a person or persons different from the persons holding those
           securities immediately prior to such transaction, or

                    (ii)   the sale, transfer or other disposition of all or
           substantially all of the assets of the Corporation in complete
           liquidation or dissolution of the Corporation, or

                    (iii)  the acquisition, directly or indirectly by an person
           or related group of persons (other than the Corporation or a person
           that directly or indirectly controls, is controlled by or is under
           common control with the Corporation) of beneficial ownership (within
           the meaning of Rule 13d-3 of the 1934 Act) of securities possessing
           more than fifty percent (50%) of the total combined voting power of
           the Corporation's outstanding securities pursuant to a tender or
           exchange offer made directly to the Corporation's stockholders.

           D. Code shall mean the U.S. Internal Revenue Code of 1986, as
              ----
amended.

           E. Common Stock shall mean the Corporation's common stock.
              ------------

                                      A-1.

<PAGE>

           F. Corporate Affiliate shall mean any parent or subsidiary
              -------------------
corporation of the Corporation (as determined in accordance with Code Section
424), whether now existing or subsequently established.

           G. Corporation shall mean Portal Software, Inc., a Delaware
              -----------
corporation, and any corporate successor to all or substantially all of the
assets or voting stock of Portal Software, Inc. which shall by appropriate
action adopt the Plan.

           H. Effective Time shall mean the time at which a new offering period
              --------------
after May 31, 2001 begins under the U.S. Plan. For example, if a new offering
period began on June 1, 2001, the Effective Time would be June 1, 2001.

           I. Eligible Employee shall mean any person who is employed by a
              -----------------
Foreign Subsidiary on a basis under which he or she is regularly expected to
render more than twenty (20) hours of service per week for more than five (5)
months per calendar year for earnings considered wages under Code Section
3401(a).

           J. Entry Date shall mean the date an Eligible Employee first
              ----------
commences participation in the offering period in effect under the Plan. The
earliest Entry Date under the Plan shall be the Effective Time.

           K. Fair Market Value per share of Common Stock on any relevant date
              -----------------
shall be determined in accordance with the following provisions:

                    (i)    If the Common Stock is at the time traded on the
           Nasdaq National Market, then the Fair Market Value shall be the U.S.
           Dollar closing selling price per share of Common Stock on the date in
           question, as such price is reported by the National Association of
           Securities Dealers on the Nasdaq National Market. If there is no
           closing selling price for the Common Stock on the date in question,
           then the Fair Market Value shall be the U.S. Dollar closing selling
           price on the last preceding date for which such quotation exists.

                    (ii)   If the Common Stock is at the time listed on any
           Stock Exchange, then the Fair Market Value shall be the U.S. Dollar
           closing selling price per share of Common Stock on the date in
           question on the Stock Exchange determined by the Plan Administrator
           to be the primary market for the Common Stock, as such price is
           officially quoted in the composite tape of transactions on such
           exchange. If there is no U.S. Dollar closing selling price for the
           Common Stock on the date in question, then the Fair Market Value
           shall be the U.S. Dollar closing selling price on the last preceding
           date for which such quotation exists.

           L. Foreign Subsidiary shall mean any non-U.S. Corporate Affiliate or
              ------------------
Affiliates as may be authorized from time to time by the Board to extend the
benefits of the Plan to their Eligible Employees. The Foreign Subsidiaries
participating in the Plan as of the Effective Date are listed in attached
Schedule A.

           M. 1933 Act shall mean the Securities Act of 1933, as amended.
              --------

                                      A-2.

<PAGE>

           N. Participant shall mean any Eligible Employee of a Participating
              -----------
Corporation who is actively participating in the Plan.

           O. Plan shall mean the Corporation's 2000 International Employee
              ----
Stock Purchase Plan, as set forth in this document.

           P. Plan Administrator shall mean the committee of two (2) or more
              ------------------
Board members appointed by the Board to administer the Plan.

           Q. Purchase Date shall mean the last U.S. business day of each
              -------------
Purchase Interval. The initial Purchase Date shall be six months after the
Effective Time.

           R. Purchase Interval shall mean each successive six (6)-month period
              -----------------
within the offering period at the end of which there shall be purchased shares
of Common Stock on behalf of each Participant.

           S. Semi-Annual Entry Date shall mean the first U.S. business day in
              ----------------------
June and December each year on which an Eligible Employee may first enter an
offering period.

           T. Stock Exchange shall mean either the American Stock Exchange or
              --------------
the New York Stock Exchange.

           U. Underwriting Agreement shall mean the agreement between the
              ----------------------
Corporation and the underwriter or underwriters managing the initial public
offering of the Common Stock.

           V. U.S. Plan shall mean the Portal Software, Inc. 1999 Employee Stock
              ---------
Purchase Plan.

                                      A-3.

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