Document:

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                                                                   Exhibit 10.35

                              EMPLOYMENT AGREEMENT

     EMPLOYMENT AGREEMENT dated as of March 14, 1999, by and between Redstone
Communications, Inc. with its principal place of business at 5 Carlisle Road,
Westford, Massachusetts 01886 (the "Company), and Chris Lawler, residing at
____________________ (the "Executive").

     WHEREAS, pursuant to an Agreement and Plan of Merger dated as of March 14,
1999 (the "Merger Agreement") among Siemens Corporation, a Delaware corporation
("Siemens"), Wolf Acquisition Corp., a Delaware corporation ("Acquisition"), and
the Company, Acquisition shall be merged with and into the Company (the
"Merger") and the Company shall be the surviving corporation in the Merger.

     WHEREAS, the Executive's stock and other equity interests in the Company
shall be acquired by Siemens in connection with the Merger.

     WHEREAS, the Executive has been employed by the Company, and the Company
wishes to offer continuing employment to the Executive in connection with the
Merger and the Executive wishes to accept such offer, on the terms set forth
below.

     Accordingly, the parties hereto agree as follows:

1.   TERM. The Company hereby employs the Executive, and the Executive hereby
accepts such employment, for an initial term commencing as of the Closing Date
(as defined in the Merger Agreement) and ending on the second anniversary of
such date, unless sooner terminated in accordance with the provisions of Section
4 or Section 5; with such employment to continue for successive one-year periods
in accordance with the terms of this Agreement (subject to termination as
aforesaid) unless either party notifies the other party in writing prior to 30
days before the expiration of the initial term and each annual renewal thereof
(the period during which the Executive is employed hereunder being hereinafter
referred to as the "Term"). Notwithstanding anything to the contrary contained
in this Agreement, in no event shall the Term commence, or any provision of this
Agreement be effective unless and until the Executive executes a Non-Competition
and Non-Solicitation Agreement and an Employee Patent and Secrecy Agreement
attached hereto as Exhibits A and B, respectively.

2.   DUTIES. During the Term, the Executive shall be employed by the Company as
Vice President of Engineering of the Company, and as such, the Executive shall
faithfully perform for the Company the duties of said office and shall perform
such other duties of an executive, managerial or administrative nature
consistent with such office as shall be specified and designated from time to
time by the Board of Directors of the Company. The Executive shall devote
substantially all of his business time and effort to the performance of his
duties hereunder.

3.   COMPENSATION.

     3.1. BASE SALARY. The Company shall pay the Executive during the Term a
base salary at the rate of $180,000 per annum (the "Annual Salary"), in
accordance with the customary payroll practices of the Company applicable to
senior executives. The Annual Salary shall be reviewed at least annually by the
Compensation Committee of the Board of Directors of the Company, but shall not
be decreased.

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     3.2. BONUS. During the Term, in addition to the Annual Salary, the
Executive shall participate in the Company's Milestone Incentive Compensation
Plan and shall have the opportunity to receive an annual bonus based on the
achievement of certain performance measures.

     3.3. BENEFITS -- IN GENERAL. The Executive shall be entitled during the
Term to participate in group life, hospitalization or disability insurance
plans, health programs, retirement plans, fringe benefit programs and similar
benefits that may be available to other senior executives of the Company
generally, on the same terms as such other executives, in each case to the
extent that the Executive is eligible under the terms of such plans or programs,
which plans and programs shall generally provide a level of benefits that is at
least as favorable as the benefits provided by the Company on the date hereof.

     3.4. EXPENSES. The Company shall pay or reimburse the Executive for all
ordinary and reasonable out-of-pocket expenses actually incurred (and, in the
case of reimbursement, paid) by the Executive during the Term in the performance
of the Executive's services under this Agreement in accordance with the ordinary
policies of the Company with respect to reimbursement of senior executives for
such expenses.

4.   TERMINATION UPON DEATH OR DISABILITY. If the Executive dies during the
Term, the Term shall terminate as of the date of death, and the obligations of
the Company to or with respect to the Executive shall terminate in their
entirety upon such date except as otherwise provided under this Section 4. If
the Executive becomes disabled for purposes of the long-term disability plan of
the Company for which the Executive is eligible, the Company shall have the
right, to the extent permitted by law, to terminate the employment of the
Executive upon notice in writing to the Executive. Upon termination of
employment due to death or disability, (i) the Executive (or the Executive's
estate or beneficiaries in the case of the death of the Executive) shall be
entitled to receive any Annual Salary and other benefits earned and accrued
under this Agreement prior to the date of termination (and reimbursement under
this Agreement for expenses incurred prior to the date of termination); (ii) the
Executive shall have a non-forfeitable right to, and shall be entitled to
receive, the consideration payable to the Executive under the Merger Agreement
with respect to which the Executive's rights were not vested at Closing (as
defined in the Merger Agreement) and which has not yet been paid as of the date
of termination; (iii) the Executive (or the Executive's estate or beneficiaries
in the case of the death of the Executive) shall be entitled to receive all
payments that he would have received under the Company's Milestone Incentive
Plan if he had remained employed through the Performance Period (as defined in
the Milestone Incentive Plan) and (iv) the Executive (or, in the case of his
death, his estate and beneficiaries) shall have no further rights to any other
compensation or benefits hereunder on or after the termination of employment, or
any other rights hereunder except as required by law.

5.   CERTAIN TERMINATIONS OF EMPLOYMENT.

     5.1. TERMINATION BY THE COMPANY FOR CAUSE.

          (a)  For purposes of this Agreement, "Cause" shall mean the
Executive's:

               (i)  commission of a felony, a crime of moral turpitude,
dishonesty, or any crime involving the Company;

               (ii) engagement in the performance of his duties hereunder, or
otherwise to the detriment of the Company, in willful misconduct, willful or
gross neglect, fraud, misappropriation or embezzlement;

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               (iii) failure to follow directions of the Board of Directors or
to follow the Company's written policies and practices, which failure is not
cured within 30 days after written notice thereof is provided to the Executive;

               (iv) breach of either of the agreements attached hereto as
Exhibits A and B, which breach is not cured within 30 days after written notice
thereof is provided to the Executive; or

               (v)  breach in any material respect of the terms and provisions
of this Agreement, which breach is not cured within 30 days after written notice
thereof is provided to the Executive; provided that the Company shall not be
permitted to terminate the Executive for Cause pursuant to Section 5.1(b) except
on written notice given to the Executive.

          (b)  The Company may terminate the Executive's employment hereunder
for Cause. If the Company terminates the Executive for Cause, (i) the Executive
shall receive Annual Salary and other benefits (but, in all events, and without
increasing the Executive's rights under any other provision hereof, excluding
any bonuses not yet paid) earned and accrued under this Agreement prior to the
termination of employment (and reimbursement under this Agreement for expenses
incurred prior to the termination of employment); and (ii) the Executive shall
have no further rights to any other compensation or benefits hereunder on or
after the termination of employment, or any other rights hereunder.

     5.2. TERMINATION BY THE COMPANY WITHOUT CAUSE; TERMINATION BY THE EXECUTIVE
FOR GOOD REASON.

          (a)  The Company may terminate the Executive's employment at any time
for any reason or no reason. If the Company terminates the Executive's
employment and the termination is not covered by Section 4 or 5.1 or the
Executive terminates service for "Good Reason", (i) the Executive shall receive
Annual Salary and other benefits earned and accrued under this Agreement and the
Company's Milestone Incentive Compensation Plan to the extent benefits are
earned, accrued and payable under the terms of such plan prior to the
termination of employment (and reimbursement under this Agreement for expenses
incurred prior to the termination of employment); (ii) the Executive shall
receive (A) a cash payment equal to 100% of the Executive's Annual Salary (as in
effect immediately before such termination), payable no later than 15 days after
such termination and (B) for a period of 12 months after termination of
employment such continuing coverage under the group health plan and the basic
life insurance plan as the Executive was receiving at the time of such
termination of employment at the same cost to the Executive as that paid by
active executive-level employees; (iii) the Executive shall have a
non-forfeitable right to, and shall be entitled to receive, the consideration
payable to the Executive under the Merger Agreement with respect to which the
Executive's rights were not vested at Closing (as defined in the Merger
Agreement) and which has not yet been paid as of the date of termination; (iv)
the Executive shall be entitled to receive all payments that he would have
received under the Company's Milestone Incentive Plan if he had remained
employed through the Performance Period (as defined in the Milestone Incentive
Plan); and (v) the Executive shall have no further rights to any other
compensation or benefits hereunder on or after the termination of employment, or
any other rights hereunder; provided that the Company's obligations with respect
to the payments and benefits provided for in this Section 5.2(a) are conditioned
upon the Executive's execution of a General Release in the standard form used by
the Company. It is expressly understood and agreed that any payment made
pursuant to this Section 5.2(a) shall be in lieu of any other payments that may
otherwise be due to the Executive under any severance or separation plan,
program or policy of the Company.

          (b)  For purposes of this Agreement, "Good Reason" shall mean (i) a
breach by the Company in any material respect of the terms and provisions of
this Agreement, which breach is not cured within 30 days after written notice
thereof is provided by the Executive or (ii) the relocation of the

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Company's principal place of business, without the consent of the Executive, by
more than 30 miles from such principal place of business on the date hereof.

          (c)  Notwithstanding clause (ii)(B) of the second sentence of Section
5.2(a), (i) nothing herein shall restrict the ability of the Company to amend or
terminate the plans and programs referred to in such clause (ii)(B) with respect
to employees of the Company generally from time to time in its sole discretion,
and (ii) the Company shall in no event be required to provide any benefits
otherwise required by such clause (ii)(B) after such time as the Executive
becomes entitled to receive benefits of the same type from another employer or
recipient of the Executive's services (such entitlement being determined without
regard to any individual waivers or other similar arrangements).

     5.3. TERMINATION BY THE EXECUTIVE OTHER THAN FOR GOOD REASON.

     The Executive may terminate his employment on at least 30 days' and not
more than 60 days' written notice given to the Company. If the Executive
terminates his employment and the termination is not covered by Section 4 or
5.2, (i) the Executive shall receive Annual Salary and other benefits (but, in
all events, and without increasing the Executive's rights under any other
provision hereof, excluding any bonuses not yet paid) earned and accrued under
this Agreement prior to the termination of employment (and reimbursement under
this Agreement for expenses incurred prior to the termination of employment);
and (ii) the Executive shall have no further rights to any other compensation or
benefits hereunder on or after the termination of employment, or any other
rights hereunder, except as required by law.

6.   OTHER PROVISIONS.

     6.1. SEVERABILITY. The Executive acknowledges and agrees that he has had an
opportunity to seek advice of counsel in connection with this Agreement. If it
is determined that any of the provisions of this Agreement, or any part thereof,
is invalid or unenforceable, the remainder of the provisions of this Agreement
shall not thereby be affected and shall be given full effect, without regard to
the invalid portions.

     6.2. DISPUTE RESOLUTION.

          (a)  Any and all claims, disputes, and controversies between the
Executive and the Company with respect to interpretation, construction, breach,
enforceability, and/or enforcement of the terms and provisions of this Agreement
(a "Dispute") shall be finally resolved as provided in this Section 6.2 by
binding arbitration. Arbitration shall be the exclusive means for determination
of all matters as above provided, and neither party shall otherwise institute
any action or proceeding in any court of law or equity, state or federal, other
than respecting enforcement of the arbitrator's decision or award hereunder. The
foregoing shall be a bona fide defense in any action or proceeding where the
matter in dispute was to be arbitrated or is being arbitrated pursuant to this
Agreement.

          (b)  The Company (or its successor in interest) or the Executive shall
have the right to submit a Dispute to arbitration, by delivery to the other, by
certified mail, of a written notice and demand for arbitration of such Dispute.
Arbitration shall be by the American Arbitration Association (the "AAA") in
accordance with its Rules applicable to such Disputes (the "Rules"), by a
neutral and impartial arbitrator acceptable to the Company and the Executive. If
such an arbitrator has not been selected by the Company and the Executive within
sixty days after AAA first provides a list of eligible arbitrators, or within
thirty days after the occurrence of a vacancy, a neutral and impartial
arbitrator shall be selected and appointed by the American Arbitration
Association, in accordance with its Rules. Unless otherwise required under
applicable law, the arbitration proceedings shall be conducted in the city where
the principal place of business of the Company is situated at the date of this
Agreement or a city mutually

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agreed to by the parties, and the procedural rules of the place of arbitration
shall apply. Each party shall be entitled to be represented by legal counsel.

          (c)  The arbitration proceedings (including discovery and the giving
of testimony) shall be conducted in strictest confidence pursuant to a
confidentiality agreement signed by the parties and devised to protect the
confidentiality of and valuable rights of the Company in the Confidential
Company Information (as defined in the Employee Patent and Secrecy Agreement)
and trade secrets as well as the confidentiality of any other confidential
information included in such proceedings. The arbitrator shall have the power
and authority to make such decisions and awards as he or she deems appropriate,
consistent with applicable law. To the extent applicable law sets particular
requirements for the conduct of such arbitration proceedings, such as, any with
respect to discovery, cross-examination, testimony, or availability of rights
and remedies, the arbitration proceedings shall be conducted in compliance with
those requirements.

          (d)  Subject to applicable law, the arbitrator may grant compensatory
damages and costs to the prevailing party (but not punitive or exemplary damages
and attorneys' fees and costs related to punitive or exemplary damages) and
injunctions that he or she may deem necessary or advisable directed to or
against a party, including a direction or order requiring specific performance
of any covenant, agreement or provision of this Agreement as a result of a
breach or threatened breach. Any decision or award of the arbitrator shall be
final, binding, and conclusive upon the parties and said decision and award may
be entered as a final judgment in any court of competent jurisdiction.

          (e)  Subject to the foregoing, the costs of such arbitration shall be
borne equally by the parties, except that each party shall bear its own
attorneys fees and costs.

     6.3. NOTICES. Any notice or other communication required or permitted
hereunder shall be in writing and shall be delivered personally, telegraphed,
telexed, sent by facsimile transmission or sent by certified, registered or
express mail, postage prepaid. Any such notice shall be deemed given when so
delivered personally, telegraphed, telexed or sent by facsimile transmission or,
if mailed, five days after the date of deposit in the United States mails as
follows:

               (i)  If to the Company, to:

                         Redstone Communications, Inc.
                         5 Carlisle Road
                         Westford, Massachusetts 01886
                         Attention:  Board of Directors

                         with a copy to:

                         Rogers & Wells LLP
                         200 Park Avenue
                         New York, New York 10166
                         Attention:  John A. Healy, Esq.

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               (ii) If to the Executive, to the address set forth above.

                         with a copy to:

                         Hale and Dorr LLP
                         60 State Street
                         Boston, Massachusetts 02109
                         Attention:  Mark G. Borden, Esq.

Any such person may by notice given in accordance with this Section 6.3 to the
other parties hereto designate another address or person for receipt by such
person of notices hereunder.

     6.4. ENTIRE AGREEMENT. Other than with respect to the agreements attached
hereto as Exhibits A and B entered into by the Company and the Executive dated
as of the date hereof, as they may be amended from time to time, which
agreements shall survive in their entirety without regard to this Agreement,
this Agreement contains the entire agreement between the parties with respect to
the subject matter hereof and supersedes all prior agreements, written or oral,
with respect thereto.

     6.5. WAIVERS AND AMENDMENTS. This Agreement may be amended, superseded,
canceled, renewed or extended, and the terms hereof may be waived, only by a
written instrument signed by the parties or, in the case of a waiver, by the
party waiving compliance. No delay on the part of any party in exercising any
right, power or privilege hereunder shall operate as a waiver thereof, nor shall
any waiver on the part of any party of any such right, power or privilege nor
any single or partial exercise of any such right, power or privilege, preclude
any other or further exercise thereof or the exercise of any other such right,
power or privilege.

     6.6. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS WITHOUT REGARD TO
PRINCIPLES OF CONFLICTS OF LAW.

     6.7. ASSIGNMENT. This Agreement, and the Executive's rights and obligations
hereunder, may not be assigned by the Executive; any purported assignment by the
Executive in violation hereof shall be null and void. In the event of any sale,
transfer or other disposition of all or substantially all of the Company's
assets or business, whether by merger, consolidation or otherwise, the Company
may assign this Agreement and its rights hereunder.

     6.8. WITHHOLDING. The Company shall be entitled to withhold from any
payments or deemed payments any amount of tax withholding required by law.

     6.9. BINDING EFFECT. This Agreement shall be binding upon and inure to the
benefit of the parties and their respective successors, permitted assigns,
heirs, executors and legal representatives.

     6.10. COUNTERPARTS. This Agreement may be executed by the parties hereto in
separate counterparts, each of which when so executed and delivered shall be an
original but all such counterparts together shall constitute one and the same
instrument. Each counterpart may consist of two copies hereof each signed by one
of the parties hereto.

     6.11. SURVIVAL. Anything contained in this Agreement to the contrary
notwithstanding, the provisions of Sections 6.2, 6.3 and 6.8, and the other
provisions of this Section 6 (to the extent necessary

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to effectuate the survival of Sections 6.2, 6.3 and 6.8), shall survive
termination of this Agreement and any termination of the Executive's employment
hereunder.

     6.12. NON-DISPARAGEMENT. While Executive's non-competition obligations
under Exhibit A are in effect, the Executive shall not publish any statement or
make any statement under circumstances reasonably likely to become public that
is critical of the Company or any of its affiliates, or in any way adversely
affecting or otherwise maligning the Company's business or the reputation of the
Company or any of its affiliates.

     6.13. EXISTING AGREEMENTS. The Executive represents to the Company that he
is not subject or a party to any employment or consulting agreement,
non-competition covenant or other agreement, covenant or understanding which
might prohibit him from executing this Agreement or limit his ability to fulfill
his responsibilities hereunder.

     6.14. HEADINGS. The headings in this Agreement are for reference only and
shall not affect the interpretation of this Agreement.

     6.15. EFFECTIVE DATE. Notwithstanding, anything to the contrary herein,
this Agreement shall become effective only upon the Effective Time (as defined
in the Merger Agreement), and this Agreement shall automatically be void upon
any termination of the Merger Agreement prior to the Effective Time.

                         [SIGNATURES ON FOLLOWING PAGE]

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     IN WITNESS WHEREOF, the parties hereto have signed their names as of the
day and year first above written.

                                   REDSTONE COMMUNICATIONS, INC.

                                   By:  /s/ James A. Dolce, Jr.
                                       -----------------------------------------

                                   Name:  /s/ James A. Dolce, Jr.
                                         ---------------------------------------

                                   Title:  President and Treasurer
                                          --------------------------------------

                                   By:  /s/ Chris Lawler
                                       -----------------------------------------
                                                     Executive

                                       8<PAGE>   1
                                                                   Exhibit 10.36

RTP OEM SOFTWARE LICENSE AGREEMENT

This OEM Software License Agreement is made and entered into as of the Effective
Date MARCH 1ST, 2001 by and between FUJITSU-SIEMENS Computers GmbH (hereinafter
called "FSC") and UNISPHERE NETWORKS INC. (hereinafter called "LICENSEE") with a
place of business at One Executive Drive, Chelmsford Massachusetts, 01824, USA
on behalf of itself and its Subsidiaries.

RECITALS

FSC develops and licenses software, APIs, documentation and other intellectual
property that enable Original Equipment Manufacturers ("OEMs") to build highly
available computing clusters for target applications which include
telecommunications equipment.

LICENSEE is an OEM who designs, manufactures, sells and supports a variety of
telecommunications equipment and software.

LICENSEE wishes to license the software known as the "Resilient Telco Platform",
hereinafter referred to as "RTP", subject to the terms and conditions of this
Agreement, for the purpose of building and redistributing software applications
with LICENSEE's equipment and/or software. RTP as used throughout this document
is understood to include also third party components as defined in Schedule D.

RTP-C Source code will be provided to enable LICENSEE to honor the response time
expectations of its service level agreements with its customers in making defect
corrections and for no other than these limited service purposes. Any other
source code changes need the prior written approval of FSC.

RTP-C can be run on both a single node as well as a multi node cluster without
requiring changes to the LICENSEE's API (except eventually changes due to timing
behavior). The target platform for the licensee is the Sun Microsystems Netra /
Solaris Operating System computer.

It is understood that both parties intend to decouple the existing SS7 protocol
stack (by Ulticom) and porting a new one into RTP. FSC is willing to provide RTP
without the existing SS7 stack, and will provide documentation and information
including a one-week workshop on the interaction between the SS7-stack and the
RTP. Any further support needs to be agreed upon separately.

Furthermore it is understood that FSC intends to replace the Oracle database by
another company's product. In this case the new database can only be used by
RTP, any applications built on top of RTP by Unisphere need a separate database
to be provided by Unisphere.

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NOW, THEREFORE, in consideration of the mutual promises and covenants herein,
the parties hereby agree as follows:

1.0      GENERAL TERMS - LICENSE GRANT

Terms of this agreement are individually negotiated and come under the purview
of Confidential Information and are governed by the Confidential Information
clause defined in Section 9.0.

1.1      FSC will provide to LICENSEE the human readable source code and all
         applicable user documentation (the "Source Code") and the matching
         machine readable binary code and all applicable user documentation (the
         "Object Code") for any delivered RTP version or release or patch,
         including comments, tools, notes, and related and supporting technical
         documentation of RTP to LICENSEE, excluding third party software
         components of RTP, for which FSC will supply to LICENSEE the machine
         readable object code. RTP is governed by the Confidential Information
         clause below.

1.2      In respect of RTP Software, FSC hereby grants to LICENSEE, and LICENSEE
         accepts, a nonexclusive (except as provided herein), world-wide,
         non-transferable (except as provided herein) license to:

         (i)      use, copy and modify the Source Code version of the RTP
                  Software (except 3rd party software) for purposes of
                  development of bug fixes, patches or work-arounds for any
                  reported problems or errors, which are of severity, level 1
                  and 2 and which require urgent resolution.

         (ii)     copy the Source Code as required for purposes of back-up,
                  disaster recovery or source code control, and

         (iii)    incorporate the Object Code version of the RTP Software into
                  the "Named Products" as hereinafter defined.

         (iv)     distribute and sublicense copies of the Object Code version of
                  the RTP Software to Licensee's end users for use with the
                  Named Products, under a sublicense agreement containing terms
                  and conditions substantially similar to those set forth in
                  this Agreement, and

         (v)      grant to Licensee's resellers the right to distribute and
                  sublicense copies of the Object Code version of the RTP
                  Software to end users for use with the Named Products, under
                  the same terms and subject to the same limitations and
                  obligations specified for Licensee above.

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1.3      Any use of RTP other than as provided in section 1.2 above is expressly
         prohibited by this Agreement. LICENSEE shall not have the right to
         place machine-readable object code for the SS7 and the database
         components of the RTP Software on its Internet site for downloading by
         its customers. Prior written approval of FSC is required if Licensee
         wishes to download the remaining components of RTP over the Internet.
         In no event shall Licensee place source code of RTP software on any
         Internet site. There is no limit on the number of copies of RTP as part
         of the Named Product that LICENSEE can sell or distribute, bundled with
         the Named Products but never on a stand-alone basis only, and whether
         directly to end user customers of LICENSEE or through third party
         distributors, or system integrators.

1.4      The License includes a limited license under patents owned by FSC, or
         in which FSC has sufficient rights from third parties to grant such
         rights, but only to the extent necessary or to exercise any license
         right granted by FSC to LICENSEE pursuant to this Agreement.

1.5      RTP (object code and source code) is licensed, not sold, to the
         LICENSEE. RTP and all modifications to the RTP are and shall become the
         sole property of FSC and its suppliers, and, other than as set forth
         above, this Agreement in no way confers any ownership rights to the RTP
         to the LICENSEE.

1.6      Except as otherwise provided in Section 1.5, Named Products are the
         sole property of LICENSEE and all ownership rights to the Named
         Products shall be and remain with the LICENSEE, and this Agreement in
         no way confers any right title or interest in or to the Named Products
         or any intellectual property rights included therein.

1.7      RTP Dependencies With 3rd Party Suppliers: It is FSC's responsibility
         to work with third parties to provide the agreed upon functionality and
         problem resolution required. The list of third party suppliers
         currently consists of:

- SS7 stack (Ulticom) [as long as it is bundled with RTP]

- Database (currently Oracle) [as far as RTP-C usage is concerned]

- Sun Cluster Software and Sun Solaris (as far as RTP-C usage is concerned)

- SNMP agent (SNMP Research International)

- Freeware/Shareware components.

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2.0      NAMED PRODUCTS

LICENSEE shall use the RTP for the purpose of creating the following Named
Products of the LICENSEE. The Named Products shall include any future revisions,
model numbers and successors for these products as well.

Named Products:  Unisphere Networks Inc. SRX-3000

The SRX-3000 is a service creation and delivery platform that allows providers
to integrate converged voice and multimedia services on cable modem access,
xDSL, and next-generation wireless networks as well as ATM and circuit-switched
networks. The SRX-3000 supports legacy and next- generation interfaces in a
integration of legacy and "new world" technologies. It enables a service
creation environment that gives service providers a choice of turnkey and mix
and match solutions. It provides control over IP, ATM, and legacy TDM
connections allowing mediation.

The Unisphere Networks Universal Call Engine provides delivery of services over
a normalized calling service interface. The Softswitch enables high-availability
and scalability to carrier grade Busy Hour Call Attempts through hardware
redundancy and multi-node clustering and rolling upgrades. It leverages
directory enabled technology to provide subscriber profile management, including
service level enforcement.

3.0      LICENSING AND ROYALTY FEES

3.1      ROYALTY FEES: LICENSEE will pay royalties per the royalty schedule
         defined in Schedule A.

3.2      DEPLOYMENT SUPPORT LICENSE FEE: LICENSEE will pay fees defined in
         Schedule B.

3.3      Royalty Fees and Deployment Support Fees due and payable shall be
         reported calendar quarterly within 10 days after each such period and
         be paid within 30 days after receipt of respective invoice. As soon as
         tools are available both parties intend to automate this process when
         technically and commercially feasible.

         Not more than once every two years, FSC may designate an independent
         certified auditor acceptable to LICENSEE to inspect the directly
         relevant records of LICENSEE during LICENSEE's regular business hours
         and at a time that is mutually agreed upon by both FSC and LICENSEE to
         determine the accuracy of all payments previously made by LICENSEE
         hereunder. The auditors will act under NDA to be mutually agreed by
         Licensee and FSC. Any expenses of such inspection shall be borne by
         FSC, unless the audit evidences an underpayment of more than five (5)
         percent. In case of an underpayment exceeding five (5) percent the
         reasonable cost for the audit shall be borne by LICENSEE. Any
         information derived from LICENSEE's reports or records shall be
         maintained in confidence by the auditor and FSC as Confidential
         Information of LICENSEE. Auditor is entitled to take notes on payment,

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         Ulticom boards, license fees and number of copies only. LICENSEE shall
         receive a copy of auditor's reports.

3.4      DEVELOPMENT SUPPORT LICENSE FEE: The normal up front development fee
         shall be waived due to the beneficial nature of the LICENSEE's project
         to FSC. All other development fee payments are due 30 days after
         receipt of invoice. FSC will invoice LICENSEE annually.

3.5      SOURCE CODE BUY OUT - FSC offers a source code buyout price of
         $250,000, not including the OMNI or database source code, but only in
         the event that FSC or any legal successor or any legal entity which has
         taken over the rights and obligations on RTP generally and permanently
         discontinues development and support of the RTP product. Any such
         buyout shall give Licensee non-exclusive rights to use the source code
         for the purposes of this Agreement especially for on going developments
         of the Named Product and for maintenance purposes. It is especially
         agreed upon by the parties, that any such buy out does not prevent FSC
         to grant third parties similar buyout rights, however limited to the
         specific purposes of respective license and service agreements
         concluded between FSC and such third parties. FSC shall provide at
         least a six-month notice of plans to terminate active development of
         the RTP product. In case of a source code buyout this Agreement shall
         be considered as terminated in accordance with section 5. Further
         details shall be mutually agreed upon in a separate source code buyout
         agreement.

3.6      DISCOUNTED TRANSFER PRICE - LICENSEE receives a transfer price of 60%
         of RTP list prices for software (Schedule A) and support and
         maintenance fees (Schedule B) and 65% for hardware (Schedule A). FSC
         agrees that LICENSEE shall receive it's best discounting structure at
         the time this agreement has been concluded under comparable conditions
         and further agrees not to discriminate against LICENSEE in the future.

3.7      MAINTENANCE: FSC provides Maintenance, which consists of Technical
         Support and includes all minor releases of RTP. Minor releases are
         those Software releases that add minor improvements and/or bug fixes to
         an existing major release, and are designated by alphabetic characters
         after the version number (e.g. 1.1B, 1.1C). FSC will provide Technical
         Support via telephone and e-mail as described in Schedules B and C of
         this Agreement. Under Technical Support, FSC shall use commercially
         reasonable efforts to assist LICENSEE in diagnosing errors/malfunctions
         and either correcting such errors/malfunctions, or assisting LICENSEE
         in using the Software to avoid them.

3.8      UPGRADES: Upgrades are major new releases of the RTP. A major release
         adds significant new functionality, and/or performance increase to a
         prior release, and is designated by a version number (e.g., 1.1, 2.0).
         FSC commits to continue upgrading RTP and provide it to LICENSEE.
         Maintenance and Upgrades are both covered by

                                                                    Page 5 of 27
<PAGE>   6
         the mandatory Development Support license and the Deployment
         Support license. For the current list prices see Schedule B.

3.9      Development Support: Source code must have a version number that
         matches the latest executable delivered. FSC will provide to Licensee
         the necessary information to construct its own "build environment" for
         RTP. Specifically FSC will provide support for problems encountered
         with executables, containing 3rd party components like e.g. Interfaces
         with Java, etc., if caused by the use of RTP.

3.10     New FEATURE REQUESTS: The process of feature requests has been
         introduced to address the occasional need for functionality of features
         deviating from the RTP manuals or for extending the documented RTP
         functionality. This process should be used for any additional
         requirements or features, licensee sees necessary for their respective
         applications. Feature request enter the RTP planning process and are
         discussed with RTP's customers for priority, time schedule and business
         impact. In the event that major RTP feature development, not previously
         included in the roadmap, is required by LICENSEE, additional costs for
         these features will be negotiated in good faith.

4.0      COPYRIGHTS

LICENSEE shall reproduce and apply any copyright or other proprietary rights
notices of third party products embedded in RTP to any copies of RTP, in whole
or in part, in any form. FSC acknowledges that LICENSEE's plan to either place
copyright notices within the Named Product itself (where it will not be viewed
by end user customers) or within a `help' or `about the Named Product' box in
the Named Product will satisfy this requirement.

4.1      Ulticom specifics: Each portion of the Software and Documentation
         reproduced by Licensee shall include the intellectual property notice
         or notices appearing in or on the corresponding portion of such
         materials as delivered by Licensor hereunder. Licensee shall ensure
         that all copies of the Software made pursuant to this Agreement
         CONSPICUOUSLY display a notice substantially in the following form:

COPYRIGHT (C) 1998 (OR OTHER APPROPRIATE YEAR(S)), ULTICOM, INC. ALL RIGHTS
RESERVED.

If Licensee is unsure of the appropriate year(s), it shall consult Licensor to
obtain the correct designation. Such notice shall be on labels on all media
containing Software. If the copyright symbol "(C)" cannot technically be
reproduced, Licensee shall use the word "Copyright" followed by the notation
"(c)" in its place.

                                                                    Page 6 of 27
<PAGE>   7
5.0      TERM AND TERMINATION

5.1      The initial term of this AGREEMENT shall commence on the EFFECTIVE DATE
         and continue thereafter for a period of 2 (two) years. Thereafter the
         term shall automatically extend from year to year unless both parties
         mutually agree to terminate the AGREEMENT including a termination by
         source code buy-out according to section 3.5.

5.2      Either Party may elect to terminate this AGREEMENT for a material
         breach of contract by the other Party upon delivery of at least 30 days
         prior written notice to the other Party; provided, however, if such
         material breach of contract is cured by the other Party within said 30
         days on or before the EFFECTIVE DATE of termination, such election and
         notice shall be of no further force and effect and this AGREEMENT shall
         not be terminated thereby.

5.3      Termination of this AGREEMENT shall not affect the licenses granted or
         copies of the Named Product sold by LICENSEE according to this
         AGREEMENT at the time of termination.

5.4      In case LICENSEE becomes a direct competitor of FSC by merging with or
         being acquired (50% or more) by a direct competitor of FSC in the field
         of Information Technology, LICENSEE will inform FSC promptly in
         writing. FSC is entitled within two months after receipt of such notice
         to terminate this AGREEMENT unless it consents to such a merger or
         acquisition. FSC shall not unreasonably withhold its consent. For
         purposes of this clause, and without limiting the generality of the
         foregoing, any withholding of consent by FSC shall not be deemed
         unreasonable if, in FSC's reasonable judgment, access by such third
         party to the RTP Software would be significantly injurious to FSC's
         business or reputation. Licenses already granted will remain unaffected
         by such termination and a reimbursement of prepaid license fees - if
         any - will be made on a pro-rata basis.

         5.5      In case FSC or its RTP-C technology is acquired by or is
         subject to a merger with a direct competitor of LICENSEE, FSC will
         inform LICENSEE promptly in writing. LICENSEE is entitled within two
         months after receipt of such notice to terminate this AGREEMENT unless
         LICENSEE consents to such a merger or acquisition. LICENSEE shall not
         unreasonably withhold its consent. For purposes of this clause, and
         without limiting the generality of the foregoing, any withholding of
         consent by LICENSEE shall not be deemed unreasonable if in LICENSEE's
         reasonable judgment, reliance by LICENSEE upon the performance by such
         competitor of FSC's duties under this Agreement would be significantly
         injurious to LICENSEE's business or reputation. Software licenses
         granted pursuant to Section 1 of this Agreement prior to the effective
         date of the termination shall be unaffected by such termination and a
         reimbursement of prepaid license fees, if any, will be made on a
         pro-rata basis. In addition to its right to terminate this Agreement,
         LICENSEE shall upon notice have the right to acquire the RTP C Source
         Code and all accompanying documentation and FSC shall grant a
         non-exclusive, perpetual and worldwide license to use, copy, modify,
         enhance, create derivative works from, produce, distribute,

                                                                    Page 7 of 27
<PAGE>   8
         license and support the Source Code. FSC shall deliver the Source Code
         and documentation within thirty days after the effective date of
         Licensee's termination. The price for the Source Code and documentation
         shall be twelve and one half million U.S. Dollars ($12,500,000) minus
         fifty percent (50%) of the cumulative royalty fees, after discount, (as
         defined in Schedule A of this Agreement) paid to FSC as of the
         effective date of such termination. Notwithstanding the foregoing, in
         no event shall the price for the Source Code and documentation be less
         than two and one half million U.S. Dollars ($2,500,000).

5.6      If this Agreement terminates for other reasons than Source Code buyout
         according to section 3.5 or 5.5, LICENSEE shall return all copies of
         the RTP (source code and object code) to FSC and shall certify in
         writing that all components of the RTP have been returned, made
         unreadable, or erased from the memory of LICENSEE's computers, all
         except the ones that may be necessary for LICENSEE to use in order to
         honor written maintenance commitments to customers existing as of the
         termination date; and LICENSEE shall have no further rights of
         distribution; however, termination of the License shall not affect any
         existing agreements with customers or licensees, whose license rights
         shall continue perpetually.

5.7      EXCEPT FOR TERMINATION DUE TO MATERIAL BREACH OF CONTRACT BY LICENSEE
         OR SOURCE CODE BUY OUT ACCORDING TO SECTIONS 3.5 AND 5.5, THE
         OBLIGATION OF FSC PURSUANT TO SECTION 2 OF SCHEDULE B AND SCHEDULE C TO
         PROVIDE SUPPORT AND MAINTENANCE ENDS 7 YEARS AFTER THE TERMINATION DATE
         OF THIS AGREEMENT.

6        REPRESENTATIONS AND WARRANTIES

6.1      FSC represents and warrants that FSC owns or has the legal right to use
         and license the RTP as licensed under this Agreement, that the RTP does
         not infringe any patent or copyright or violate any other proprietary
         rights of a third party, and that FSC has the full power and authority
         to enter into this Agreement. Concerning Ulticom the above statement is
         subject to pending contract signature between Siemens AG and Ulticom.
         FSC further represents and warrants to the best of its knowledge and
         belief that as of the Effective Date and thereafter throughout the
         term, the statements contained in this Article 6.0 are and shall be
         true and correct.

6.2      FSC warrants that the RTP, including related supporting data and files,
         will function correctly when dealing with dates, times and date/time
         related data in the following manner; (i) the RTP will accurately
         process date/time data (including calculating, comparing, and
         sequencing) from, into, and between the twentieth and twenty-first
         centuries, and the years 1999 and 2000 and leap year calculations, (ii)
         when used in combination with information technology products from
         other vendors used by RTP,

                                                                    Page 8 of 27
<PAGE>   9
         the RTP will accurately process date/time to data with the other
         vendor's information technology products, and (iii) the RTP will
         neither contain nor create any logical or mathematical inconsistency,
         will not malfunction, and will not cease to function when processing
         date/time data.

6.3      If LICENSEE requires information concerning origin of the RTP due to
         government contract requirements or other U.S. reporting requirements,
         LICENSEE will provide FSC with a written outline of the specific
         information requirements, which products such requirements apply to,
         and the reason or legal basis for the requirement. Upon receipt of such
         information from LICENSEE, FSC will supply the information requested.

6.4      EXCEPT AS EXPRESSLY PROVIDED HEREIN, FSC DOES NOT MAKE AND HEREBY
         DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTIES RELATING TO THE RTP,
         INCLUDING BUT NOT LIMITED TO, MERCHANTABILITY OR FITNESS FOR A
         PARTICULAR PURPOSE, OR ANY WARRANTIES THAT MIGHT ARISE FROM A COURSE OF
         DEALING, USAGE OR TRADE PRACTICE.

7        LIMITATION OF LIABILITY

7.1      TO THE MAXIMUM EXTENT PERMITTED BY LAW, UNDER NO CIRCUMSTANCES AND
         UNDER NO LEGAL THEORY, WHETHER TORT (INCLUDING NEGLIGENCE), PRODUCT
         LIABILITY, CONTRACT, OR OTHERWISE, SHALL EITHER PARTY BE LIABLE TO THE
         OTHER OR ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL,
         RELIANCE OR CONSEQUENTIAL DAMAGES, EVEN IF IT SHALL HAVE BEEN INFORMED
         OF THE POSSIBILITY OF SUCH DAMAGES.

7.2      In no event shall the aggregate liability of either party exceed the
         aggregate amount paid by LICENSEE for the RTP under this Agreement,
         except for loss or damage arising out of:

         (a)      breach of Sections 8.0 (INDEMNIFICATION) or 9.0 (CONFIDENTIAL
                  INFORMATION)of this Agreement, or

         (b)      Licensee's breach of its obligations under Section 1.3 of this
                  Agreement to (i) distribute the RTP Software only when bundled
                  with the Named Products and not on a stand-alone basis, and
                  (ii) not place the source code of the RTP Software on any
                  Internet site.

                                                                    Page 9 of 27
<PAGE>   10
         Each party's liability arising out of subparagraphs 7.2(a) and 7.2(b)
         shall be limited to the greater of (c) the amount of its applicable
         insurance coverage limits or (d) the aggregate amount paid by Licensee
         for the RTP under this Agreement, provided however that in no event
         shall such limitation of liability arising out of subparagraphs 7.2(a)
         and 7.2(b) be less than ten million US dollars ($10,000,000).

8. INDEMNIFICATION

8.1      Notwithstanding Article 7 above, FSC agrees that it will, at its own
         expense, defend LICENSEE in respect of any action brought against
         LICENSEE, and indemnify LICENSEE against any award of damages and costs
         made against LICENSEE in any and all claims, actions or suits alleging
         that the RTP used within the scope of the License herein granted
         constitutes an infringement of any patent or copyright or other
         intellectual property rights. The indemnification obligation shall not
         apply, where the infringement is caused by modifications of RTP made by
         LICENSEE, if the infringement is solely based on said modifications or
         attributably caused by any use of the RTP in combination, operation or
         use with any machine, program or other material, if the infringement is
         solely based on such combination.

8.2      LICENSEE shall notify FSC promptly in writing of any action brought
         against LICENSEE based on a claim described in Section 8.1. FSC shall
         defend such action at its expense and pay all expenses and costs
         attributable to such claim incurred by LICENSEE, and all settlements
         and damages awarded against LICENSEE in such action or settlement that
         are attributable to such claim. FSC shall have control of the defense
         of such action including appeals, and of all negotiations thereof,
         including the right to effect any settlement or compromise with the
         written consent of LICENSEE. LICENSEE shall reasonably cooperate with
         FSC in the defense of such claim at FSC cost, and may be represented,
         at LICENSEE's expense, by counsel of LICENSEE's selection. In the event
         that counsel retained by FSC advises FSC and/or Licensee that in the
         opinion of such counsel there exists a conflict between the interests
         of FSC and the interests of Licensee in connection with any issues
         arising out of such infringement claim, including without limitation
         the litigation or settlement thereof, then FSC shall retain, at its
         expense, additional outside counsel acceptable to Licensee to represent
         the interests of Licensee with respect to such conflict.

8.3      In case the RTP is held to constitute an infringement and its use is in
         any way enjoined, FSC shall at its option and expense (a) procure for
         LICENSEE the right to continue using the RTP or (b) replace or modify
         the same so that it becomes non-infringing and performs the same
         service with substantially the same quality, or, if neither of the
         foregoing options (a) or (b) are commercially practicable, (c) grant

                                                                   Page 10 of 27
<PAGE>   11
         LICENSEE a credit, less reasonable depreciation for use, damage and
         obsolescence, upon return of the RTP to FSC , but in no event less than
         the amount LICENSEE is obligated to return to its customers.

8.4      Except as expressly provided in Section 8.1, LICENSEE shall defend FSC
         from all third party claims brought against FSC to the extent based
         upon the combination of RTP with the Named Product, provided that FSC
         shall notify Licensee promptly in writing of any action brought against
         FSC based on a claim described in this Section 8.4. Licensee sole
         obligation shall be to defend such action at its expense and pay all
         expenses and costs attributable to such claim incurred by FSC, and all
         settlements and damages awarded against FSC in such action or
         settlement that are attributable to such claim. Licensee shall have
         control of the defense of such action including appeals, and of all
         negotiations thereof, including the right to effect any settlement or
         compromise with the written consent of FSC. FSC shall reasonably
         cooperate with Licensee in the defense of such claim at Licensee's
         cost, and may be represented, at FSC's expense, by counsel of FSC's
         selection. In the event that counsel retained by Licensee advises FSC
         and/or Licensee that in the opinion of such counsel there exists a
         conflict between the interests of FSC and the interests of Licensee in
         connection with any issues arising out of such infringement claim,
         including without limitation the litigation or settlement thereof, then
         Licensee shall retain, at its expense, additional outside counsel
         acceptable to FSC to represent the interests of FSC with respect to
         such conflict.

9        CONFIDENTIAL INFORMATION

9.1      Each party shall maintain the confidentiality of the other party's
         Confidential Information and shall not, without the other party's prior
         written consent, (a) use such Confidential Information in any manner
         not authorized under this Agreement, or (b) disclose any such
         Confidential Information in any form to any person, except to (i) its
         employees or agents whose access is necessary in connection with the
         performance of this Agreement and (ii) licensees licensed under this
         Agreement to receive such Confidential Information. Each party shall
         protect the other party's Confidential Information to the same extent
         and with all reasonable efforts as it protects its own Confidential
         Information in order to maintain the security and confidentiality of
         Confidential Information. "Confidential Information" means any business
         or technical information of either party, that (a) is provided to the
         other party in connection with this Agreement, (b) is designated in
         writing as confidential information, and (c) concerns the party's
         business, methods, plans, designs, procedures, systems operations, or
         technology, research, customer or financial data. Confidential
         Information includes the RTP and the Source Code, except to the extent
         that the License and rights granted under this Agreement permit
         distribution of the same (and derivative works thereof) to third
         parties. Confidential Information does not include

                                                                   Page 11 of 27
<PAGE>   12
         any information that (a) is or becomes publicly available through no
         act, omission or fault of the receiving party, (b) was or is known to
         the receiving party without any obligation of confidentiality before
         being received from the disclosing party, (c) is disclosed to the
         receiving party by a third party not under any obligation of
         confidentiality owing to the disclosing party, or (d) is independently
         developed by the receiving party.

9.2      Any breach of Section 9.1 above may cause immediate and irreparable
         harm for which monetary damages would be an inadequate remedy and
         therefore, if any Confidential Information is wrongfully disclosed or
         used, then in addition to the remedies provided by this Agreement and
         by law, the party whose Confidential Information is wrongfully
         disclosed or used shall be entitled to an injunction preventing further
         disclosure or use of the Confidential Information by the other party or
         by any third party to whom the Confidential Information has been
         wrongfully disclosed.

9.3      The obligations of this Article 9 shall continue throughout the term of
         this Agreement and shall survive for three (3) years following any
         expiration or termination of this Agreement.

10       EXPORT; RESTRICTED RIGHTS

The Parties agree to cooperate in complying with any export laws and regulations
of the United States, including the regulations of the U.S. Department of
Commerce, with respect to the export of U.S. origin technical data and
commodities, and agree to provide the Letters of Assurance and other documents
as may be required under such laws and regulations and secure licenses for
export or re-export.

11       ACCEPTANCE

11.1     LICENSEE shall diligently evaluate the RTP Software and shall submit a
         written acceptance or rejection to FSC within ninety (90) days after
         delivery of each RTP object code release or thirty (30) days after the
         last reported severity 1/2 error, whichever is later.

11.2     In the absence of written rejection by such date, LICENSEE will be
         deemed to have accepted the Licensed Programs.

11.3     LICENSEE may reject the Licensed Programs if:

                                                                   Page 12 of 27
<PAGE>   13

11.3.1   On the Acceptance Date, there are any unresolved problems of Severity 1
         or 2 (as set forth in Schedule C of each Addendum) reported to FSC at
         least thirty (30) days previously, or

11.3.2   On the Acceptance Date, there is an unreasonable number of open
         problems of Severity 3 or 4 which FSC has failed to resolve within the
         committed resolution time described in Schedule C.

11.4     Upon written rejection by such date, LICENSEE's license rights to the
         rejected Licensed Programs shall be terminated, LICENSEE shall destroy
         all of the Proprietary Information associated with the rejected
         Licensed Programs, and FSC will promptly refund to LICENSEE all
         payments made for the rejected Licensed Programs.

11.5     Following acceptance of the Licensed Programs by LICENSEE, FSC will
         have no liability for the consequences of any use, which LICENSEE makes
         of the Licensed Programs except, as otherwise provided in this
         Agreement.

12.0     MISCELLANEOUS

12.1     This Agreement may be amended only by the written agreement of the
         parties.

12.2     This Agreement, and the rights and obligations of a party hereunder,
         may not be assigned or delegated, voluntarily or by operation of law,
         without the prior written consent of the other party, which shall not
         be unreasonably withheld or delayed, provided, however, that either
         party may assign this Agreement without the prior written consent of
         the other (i) to any subsidiary or company of which the assigning party
         is a subsidiary so long as the assigning party remains responsible for
         such subsidiary's performance. or (ii) subject to sections 5.5 or 5.6
         of this Agreement, to a person or entity into which it has merged or
         which has otherwise succeeded to all or substantially all of its
         business and assets to which this Agreement pertains, by purchase of
         stock, assets, merger, reorganization or otherwise, and which has
         assumed in writing or by operation of law its obligations under this
         Agreement.

12.3     This Agreement is the result of negotiation between the parties and,
         accordingly, shall not be construed for or against either party
         regardless of which party drafted this Agreement or any portion
         thereof.

12.4     This Agreement constitutes the whole and entire agreement of the
         parties on the subject matter hereof. This Agreement supersedes all
         prior representations, proposals, correspondence, memoranda or other
         communications, whether written or oral, all of which are expressly
         excluded from this Agreement. In the event of a conflict between the
         terms of this Agreement and any schedules attached hereto the terms of
         the Agreement shall prevail.

                                                                   Page 13 of 27
<PAGE>   14
12.5     This Agreement shall be governed by and construed in accordance with
         the laws of the State of New York, exclusive of its conflict of law
         principles

12.6     FORCE MAJEURE. Neither party shall be liable for any loss or damage due
         to failure or delay arising out of acts of God or any other cause
         beyond that party's reasonable control.

12.7     Notwithstanding injunctive relief according to Section 9.2, all
         disputes arising out of or in connection with the present agreement,
         including any questions regarding its existence, validity or
         termination, shall be finally settled by binding arbitration under the
         "Commercial Rules" of arbitration of the American Arbitration
         Association (AAA) by three arbitrators in accordance with said Rules.
         Each party shall nominate one arbitrator for confirmation by the
         competent authority under the applicable Rules (Appointing Authority).
         Both arbitrators shall agree on the third arbitrator within 30 days.
         Should the two arbitrators fail, within the above time limit, to reach
         agreement on the third arbitrator, he shall be appointed by the
         Appointing Authority. If there are two or more defendants, any
         nomination of an arbitrator by or on behalf of such defendants must be
         by joint agreement between them. If such defendants fail, within the
         time limit fixed by the Appointing Authority, to agree on such joint
         nomination, the proceedings against each of them must be separated. All
         arbitrators must have sufficient experience in the IT industry and in
         international business transactions.
         Notwithstanding the rules of arbitration of the AAA, the parties (i)
         shall submit their dispute to the arbitrators within 2 months following
         their decision that they could not resolve their dispute, (ii) each
         party shall have no more than 5 days to present their case and (iii)
         the arbitrators shall be instructed to render their decision within 30
         days following the conclusion of each party's presentation. The
         arbitrators shall specify the basis for their decision. The arbitrators
         shall not award any punitive damages. The decision of the arbitrators
         shall be considered as a final and binding resolution of the dispute,
         shall not be subject of appeal and may be entered as a judgment in any
         court of competent jurisdiction. The seat of arbitration shall be
         Switzerland. The procedural law of this place shall apply where the
         Rules are silent, however no pre-trial discovery procedure or jury
         trial shall be allowed in the arbitration proceedings. The language to
         be used in the arbitration proceedings shall be English. The whole
         arbitration procedure shall be executed pursuant to a strict
         non-disclosure agreement signed by the parties and the arbitrators
         agreeing to conduct such proceedings and maintaining in confidence all
         confidential information or trade secrets disclosed or produced in the
         course thereof. All press releases or public statements regarding the
         status of such proceedings shall be prepared jointly and only by the
         parties, unless otherwise required by law.

12.8     Each party is and shall remain an independent contractor. Nothing in
         this Agreement shall be deemed to establish a partnership, joint
         venture or agency relationship between the parties. Neither party may
         obligate or bind the other party in any manner to a third party.

                                                                   Page 14 of 27
<PAGE>   15
12.9     Any notices required to be given under this Agreement shall be in
         writing and sent to the address of the appropriate party as set forth
         below or to such other address as may have been substituted by written
         notice and shall be effective upon receipt.

If to LICENSEE:

Michael Regan
VP Engineering - Voice
Unisphere Networks Inc.
One Executive Drive
Chelmsford, MA, 01824
978-848-0350 (voice)
978-848-0399 (fax)
e-mail: mregan@unispherenetworks.com

Georg Haubs
Vice President - Strategic Planning and Business Development
Unisphere Networks Inc.
One Executive Drive
Chelmsford, MA, 01824
978-848-0313 (voice)
978-848-0399 (fax)
e-mail: ghaubs@unispherenetworks.com

If to FSC:

Dr. Bartholomaeus Kellerer
Director UNIX Products
Fujitsu Siemens Computers GmbH
FSC EP OS XP
81730 Munchen
Phone: +49 89 636 47805
Fax: +49 89 636 48976
mailto: bartholomaeus.kellerer@fujitsu-siemens.com

Dr. Mathias Lejeune
FSC Legal
Fujitsu Siemens Computers GmbH
81730 Munchen
Phone: +49 89 636 42651
Fax: +49 89 636 46648
mailto: mathias.lejeune@fujitsu-siemens.com

                                                                   Page 15 of 27
<PAGE>   16
12.10    Any notices given shall be deemed to have been received as follows: if
         sent by facsimile, when transmitted; if sent by certified first class
         mail, on the date of delivery as shown on the return receipt; if sent
         by Federal Express or equivalent overnight delivery services or by
         personal delivery, on the date delivered.

12.11    The waiver by either party of a breach or default by the other party,
         or the failure to exercise any remedy, shall not be deemed to be a
         waiver of any future breach, default or remedy. All remedies of a party
         provided herein, together with all remedies available at law or in
         equity, shall be cumulative.

12.12    If any provision or provisions of this Agreement shall be held to be
         illegal, invalid or unenforceable, the legality, validity and
         enforceability of the remaining provisions of this Agreement shall not
         in any way be affected or impaired. The parties agree to negotiate to
         replace the illegal, invalid or unenforceable provision with a legal,
         valid and enforceable provision that preserves the rights and
         obligations of the parties to the fullest practicable extent.

12.13    This Agreement shall be binding upon, and inure to the benefit of, the
         successors and permitted assigns of the parties.

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed by
their respective duly authorized representatives as of the Effective Date.

FSC                                              UNISPHERE NETWORKS INC.

By: /s/ Kellerer                                 By:  /s/ James A. Dolce, Jr.
  ----------------------------------                 ---------------------------
         (Signature)                                        (Signature)

Name: Kellerer                                   Name:    James A. Dolce, Jr.
    --------------------------------                      ----------------------

Title: Director                                  Title:   CEO and President
     -------------------------------                      ----------------------

Date: March 9th, 2001                            Date:    March 9th, 2001
    --------------------------------                      ----------------------

By: /s/ illegible
  ----------------------------------
         (Signature)

Name: illegible
    --------------------------------

Title: Counsel
     -------------------------------

Date: March 9th, 2001
    --------------------------------

                                                                   Page 16 of 27
<PAGE>   17
SCHEDULE A - OFFERED PRODUCTS, TECHNOLOGY LICENSING FEES & ROYALTY SCHEDULE

RTP LIST PRICE-PRODUCT DELIVERABLES:

1. RTP-C

RTP-C is a package which bundles the following modules:

RTP-CS (Core Simplex) provides complete RTP API.

RTP-CNS (Core Non-Stop)

Upgrades a Simplex system to a highly available n-node cluster which allows full
non-stop computing functionality, distributed across multiple computing nodes
(for pricing purposes only, technically already contained in RTP-CS).

The simplex version is created for pricing purposes only; technically a
multi-node SW will be delivered.

2.    RTP-SS7 (provide SS7-Stack including ISUP + TCAP + MAP)

RTP- CS /CNS DEPLOYMENT LICENSES

INTERNET OFFLOAD

<TABLE>
<CAPTION>
PRODUCT           40,000 PORTS    EXPANSION FROM  40,001   EXPANSION FROM 200,001    EXPANSION ABOVE
                                  TO 200,000  PORTS        TO 600,000 PORTS          600,001  PORTS
------------------------------------------------------------------------------------------------------
<S>               <C>             <C>                      <C>                       <C>
RTP-CS            $ 20,000        $ 0.30 per port          $ 0.15 per port           $ 0.05   per port

RTP-CNS                                                    $ 25,000
</TABLE>

                                                                   Page 17 of 27
<PAGE>   18
VOICE APPLICATIONS

<TABLE>
<CAPTION>
PRODUCT           10,000 PORTS    EXPANSION FROM    EXPANSION FROM    EXPANSION FROM    EXPANSION FROM    EXPANSION
                                  10,001 TO         20,001 TO         60,001            120,001 TO        ABOVE 240,001
                                  20,000 PORTS      60,000 PORTS      TO 120,000 PORTS  240,000 PORTS     PORTS
-------------------------------------------------------------------------------------------------------------------------
<S>               <C>             <C>               <C>               <C>               <C>               <C>
RTP-CS            $ 35,000        $ 3.00 per port   $ 1.50 per port   $ 0.50 per port   $ 0.45 per port   $ 0.35 per port

RTP-CNS                                                               $ 25,000
</TABLE>

For small start configurations a special 5,000 port configuration is offered at
the price of $17,500.

Lab evaluation licenses for both applications are free of charge for 6 months
(maximum five simultaneous).

These prices are based on the following performance and configuration
assumptions provided by Licensee:

-    Voice: call duration 4 min; 1.5 ports per call on average

-    IOL: call duration 30 min; 2 ports per call

-    83 tps per CPU under normal system load including application processing
     (70%)

-    3 tps per call

Substantial Changes of these assumptions shall be reported from Licensee to FSC
and new prices will be negotiated in good faith.

RTP-SS7 DEPLOYMENT LICENSE (ULTICOM)
License prices are based on the aggregate annual purchasing volumes of Ulticom's
Software, Board and Link revenues including revenues for RM-series of Siemens AG
and related companies.

<TABLE>
<S>                                                             <C>
Less than $ 2,500,000                                           $ 106,000
$ 2,500,001 to $ 4,000,000                                      $  98,000
$ 4,000,001 and above                                           $  85,000
</TABLE>

RTP-SS7 BOARDS

 Board Prices are based on the aggregate annual purchasing volumes of software,
boards and link revenues including revenues for RM-series of Siemens AG and
related companies.

                                                                   Page 18 of 27
<PAGE>   19
<TABLE>
<CAPTION>
      BOARD                                               BOARD PRICE
                      --------------------------------------------------------------------------------
                        LESS THAN                 $2,500,001                     $ 4,000,001 AND ABOVE
                      $ 2, 500,000               TO $ 4,000,000
                      ------------               --------------                  ---------------------
<S>                   <C>                        <C>                             <C>
Two link V.35            $ 8.400                    $ 7.400                             $ 6.400
PCI Board

4-link T1/ E1           $ 13.000                    $ 11.600                           $ 10.600
PCI Board

8-link T1/E1 PCI        $ 17.000                    $ 16.000                           $ 14.800
Board

8-link T1/E1 PCI        $ 5.500 (net, no
Board for               additional discount)
development
purposes
</TABLE>

NOTE: HW support for Ulticom boards are not covered by this agreement and need
to be contracted separately between LICENSEE and Ulticom.

                                                                   Page 19 of 27
<PAGE>   20
SCHEDULE B - SUPPORT AND MAINTENANCE FEES

1. RTP-DEVELOPMENT- AND -SUPPORT LICENSE:

    RTP-DEVELOPMENT / SUPPORT LICENSE is required for each different
    application/project which is developed on top of RTP (example: Voice
    Application including Internet Offload). If the development group is spread
    over several development sites, the license has to be paid only once. The
    license includes 7x24 premium support for one year. For subsequent years a
    reduced support license is available.

    RTP-DEVELOPMENT LICENSE

    RTP-C-Development:  $  120,000
    RTP-SS7-Development:  $  127,000

    These development licenses are waived for the applications covered by this
    agreement on the day of signature.

    RTP-DEVELOPMENT-SUPPORT LICENSE

    RTP-PREMIUM-CARE (7X24) is an annual fee, which includes beside the
    maintenance all new update and upgrade versions of RTP. RTP-Premium-Care
    (7x24) is tailored to meet the support and maintenance needs of application
    developers. Standard support contracts for end customers are licensed per
    cluster. In opposite to these licenses, RTP-Premium-Care is a package for
    the complete development site. It covers a pool of cluster servers, which
    are deployed for application development. RTP-Premium-Care provides direct
    access to RTP engineering. RTP-Premium-Care is mandatory for each
    development and test site.

    The following table defines the support licenses available:

<TABLE>
<CAPTION>
        PRODUCT LICENSE                          NUMBER OF SYSTEMS       TOTAL LICENSE LIST
                                                                         PRICE
        -----------------------------------------------------------------------------------
<S>                                              <C>                     <C>
        RTP-C-Premium-Care-4                             1-4                   $ 40,000

        RTP-C-Premium-Care-UL                            > 4                   $ 60,000

        RTP-SS7-Premium-Care-4                           1-4                   $ 42,000

        RTP-SS7-Premium-Care-UL                          > 4                   $ 63,000
</TABLE>

                                                                   Page 20 of 27
<PAGE>   21
    For V1.0 the first annual fee is due with FCS (First Customer Shipment)
    planned for April/May 2001.

2. DEPLOYMENT SUPPORT LICENSE:

    For each deployed license of the Named Product, the licensee has to sell a
    RTP support license to the end customer (can be embedded in the support
    license of the Named Product). The deployment support license will be 15% of
    the RTP product list price. This annual support fee includes the maintenance
    support as described in Schedule C plus the new update and upgrade versions
    of RTP. FSC will provide second level support; front-line support has to be
    provided by the licensee (details in Schedule C).

                                                                   Page 21 of 27
<PAGE>   22
SCHEDULE C MAINTENANCE AND SUPPORT

In accordance with the article 3.0 and Schedule B of this Agreement, FSC will
provide Licensee and Licensee's customer with Maintenance and Support Services
as further described herein. These Services are only applicable to Licensee and
Licensee's customer with properly licensed RTP Software from FSC and a
non-terminated Development- or Deployment-Support License.

FSC RESPONSIBILITIES

FSC will provide back-end or third level technical support and maintenance for
RTP Software in accordance with the Maintenance and Support Services for

     -    RTP-Core as described below in section C 1

     -    RTP-SS7 (as long as Ulticom's SS7 stack is bundled with RTP) as
          described in Attachment D, OEM Maintenance and Support of the OEM
          License Agreement between Siemens AG and Ulticom.

FSC will also provide a support management escalation contact, to which any
concerns with quality of service or status of critical support incidents may be
directed.

Should Licensee request for on-site Engineering Support, Licensee shall
reimburse FSC for all reasonable travel and lodging expenses incurred by FSC
personnel to provide such support, and shall pay FSC its then-current
professional services daily consulting rate for the FSC personnel providing
Engineering Support.

LICENSEE RESPONSIBILITIES

Licensee will, at its own expense, provide front-line or first and second level
technical support to its distributors and end-customers. Such support includes
call receipt, call screening, installation assistance, problem identification
and diagnosis, efforts to create a repeatable demonstration of the Problem and,
if applicable, the distribution of any defective media or Updates.

When requesting support, Licensee will follow FSC's prescribed support
procedures and will make best efforts to provide necessary access to technical
information, diagnostic data, system configurations, and other items that FSC
will require to resolve reported Problems. Licensee will designate no more than
two (2) authorized contacts through which support will be routed to FSC.

SCHEDULE C 1 - MAINTENANCE AND SUPPORT SERVICES FOR RTP-CORE (RTP-C)

                                  Page 22 of 27
<PAGE>   23
SOFTWARE UPDATE SERVICES

Licensee with non-terminated Support License automatically receives a copy of
new releases of RTP-C and accompanying documentation when made generally
available by FSC. Licensee may install the new release on each device with a
valid Support License.

MAJOR RELEASES: FSC periodically produces "Major Releases" (e.g. Version 1.1,
2.0 etc.) of the RTP-C Software, which may contain significant new functions and
problem repairs. Each Major Release is supported with Minor Releases, Bug Fixing
Packages and Technical Support for thirty-six (36) months following the general
availability date of that Major Release.

MINOR RELEASES: During the support for a Major Release, FSC periodically
produces "Minor Releases" (e.g. Version 1.1B, 1.1C etc.) that may contain new
functions with limited impact and problem corrections. Minor Releases also
contain the official version of all fast bug fixes agreed upon between licensor
and licensee, which are implemented by Licensee between two Minor Releases.

BUG FIXING PACKAGES: During the support period of a Major Release and in between
Minor Release deliveries, FSC will deliver Bug Fixing Packages with corrections
to Critical Problems.

FSC reserves the right to change the frequency of Major Releases and Minor
Releases.

TECHNICAL SUPPORT

FSC shall maintain a trained staff capable of rendering Technical Support for
RTP-C Software.

PROBLEM REPORTING: FSC shall maintain a Customer Support Team capable of
receiving Licensee generated Problem Reports for Problems manifested on RTP-C.
The Customer Support Team is reachable 24 hours per day, 7 days per week via
e-mail or via telephone.

PROBLEM REPORTS: Problem Reports submitted by Licensee shall contain the
following information and shall be assigned a tracking number by FSC:

-    Identification of end-customers environment.

-    Problem Severity (see Table 1).

-    Identification of Software Releases in use.

-    Machine and Network Configuration.

-    Description of Problem, Circumstances leading to the Problem, Licensee's
     evaluation of the Problem, any other reasonable analysis data available
     such as line monitor traces, log files etc.

Licensee shall assist FSC, as reasonably requested, to perform additional tests
and gather information to aid FSC's analysis of the Problem. In the event of
critical problems that are not reproducible at FSC's facilities, FSC may request
remote access to Licensee's development center to assist FSC in collecting
and analyzing data in the data collection process. In the event the critical
problem is not reproducible at Licensee's development center, FSC may request
Licensee to obtain remote access to Licensee's

                                  Page 23 of 27
<PAGE>   24
End-customer site in consent with Licensee's end-customer.

PROBLEM SOLUTION. Within the Response Time (see Table 1) of verifying that such
Problem is present, FSC shall initiate work in a diligent manner toward
development of a Problem Solution (solution that enables the RTP Software to
substantially conform to the accompanying documentation for the release). FSC
shall inform Licensee of the expected time frame within which such Problem
Solution shall be delivered. Notwithstanding any such estimated time frame, FSC
shall make reasonable commercial efforts to provide Problem Solution within the
Resolution Time defined in Table 1.

RESPONSE AND RESOLUTION TIMES

<TABLE>
<CAPTION>
     SEVERITY       DESCRIPTION                                          RESPONSE TIME         RESOLUTION TIME
--------------------------------------------------------------------------------------------------------------------
<S>                 <C>                                                  <C>                   <C>
                    Critical - Problem that prevents or seriously
                    impairs the execution of a major function in the
        1           Licensed Programs either by LICENSEE or a
                    sublicensee of LICENSEE.  No suitable work-around    4 hours               1 working day
                    is available.

                    Severe Impact - Problem that significantly impairs                         5 working days
                    the execution of a major function in the Licensed
        2           Programs either by LICENSEE or a sub licensee of
                    LICENSEE. A short-term work-around is available.     4 hours

                    Degraded Operation - Problem that disables or        1 working day         20 working days
        3           impairs the execution of a minor function in the
                    Licensed Programs.

                                                                         14 working days       180 working days or in
                    Minor Impact - Problem in a rarely used function                           next maintenance
        4           or problem for which an easy and effective method                          release, whichever
                    for avoiding the impact exists.                                            comes sooner
</TABLE>

TABLE 1.

Proposals for temporary workarounds like reboot system/reload HW-Controller,
changes of configuration, reducing system load or deactivate single components
will be made by our support team within the Response Time.

                                  Page 24 of 27
<PAGE>   25

All Problem Solutions shall be deemed part of the RTP-C Software and subject to
the terms and conditions of the License Agreement. Depending on the nature of
the Problem and the timing of the next scheduled Major Release or Minor Release,
the Problem Solution may take one of the following forms:

-    Major Release or Minor Release.

-    Bug Fixing Package of RTP-C that delivers a correction of the Critical
     Problem.

-    Problem Repairs are only made to the Major Release, the latest Minor
     Release of the supported Major Release or the latest Bug Fixing Package.

-    Workaround instructions to enable Licensee to avoid the adverse effects of
     the Problem, including restarting some or all of the RTP components in the
     event a solution or fix has not been finalized.

-    Temporary "Fast Bug Fixes" implemented by Licensee. Licensee shall report
     these changes of the source code to FSC. FSC may integrate these changes
     into the next release of RTP-C or implement an own solution of this
     problem.

FSC shall include all Problem Solutions as agreed upon between Licensee and
Licensor in the next practical and all subsequent releases of the RTP-C.

                                  Page 25 of 27
<PAGE>   26
SCHEDULE D  - LIST OF DELIVERABLES

SOFTWARE
RTP-C  (CORE)
       RTP-C as specified in the documentation listed below
       Source Code RTP-C
       Machine-readable object code of  RTP-C
       Makefiles
       Tools and appropriate sources

RTP-SS7
       Machine-readable object code of SignalWare(R) from Ulticom
       No source code and no headerfiles

DOCUMENTATION
RTP-C
       Installation/Configuration Guide
       Administration Guide
       Programmer Guide
       Online Release Documentation
       Performance Documentation
           FSC will provide for Major Releases basic component-specific
           Performance figures, including (but in the future not limited)
           Context Manager, Communication Manager and Timer Manager.
       Data Sheet
       The high availability concept of the Resilient Telco Platform

RTP-SS7
       SignalWare(R) customer documentation from Ulticom

TESTING ON SUN-CLUSTER

RTP tests are performed on a limited set of non PrimePower configurations (at
the moment SUN-450 with 4 processors). Tests on other customer specific
configurations are in the responsibility of the application developer. On
request, test and problem Analysis support can be provided in the framework of
RTP service offerings. Of course, FSC takes responsibility for bug fixing in
case of identified RTP problems.

Each release shall be certified by FSC to provide the features, and successfully
work in the configurations, stated in its Release notes. Furthermore, FSC shall
certify that its software performs correctly with the base platform stated
above.

SUN CLUSTER CERTIFICATION

                                 Page 26 of 27
<PAGE>   27
In the event that the Named Product needs to be certified by Sun, both partners
will jointly go through this certification process, support each other and cover
all its portion of the cost. The initial certification cost payable to Sun will
be shared 50/50. FSC will pay its share by providing licenses free of charge up
to the amount due.

Annual renewal fees have to be carried by licensee. Additional certifications
due to major changes in the products have to be carried by the party whose
product causes the additional certification. FSC will not carry fees caused by
changes in the Sun Cluster Software.

3RD PARTY PRODUCTS PROVIDED BY FSC

SNMP AGENT (SNMP RESEARCH INC)

FSC provides LICENSEE with license for the RTP SNMP master-agent. Subagents
would have to be procured by LICENSEE from another vendor.

SS7 STACK

Development support of the Ulticom SS7 stack and SS7 boards is the
responsibility of FSC. Inter-operational feature negotiations and support issues
between RTP (including OS, clustering software and RTP) and the Ulticom solution
are the responsibility of FSC.

 SHAREWARE/FREEWARE USED IN RTP

 as listed in the RTP Data Sheet.

                                 Page 27 of 27

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