Document:

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                                                                    EXHIBIT 10.9

CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE PORTIONS OF THE
AGREEMENT INDICATED WITH AN ASTERISK (*). A COMPLETE COPY OF THIS AGREEMENT,
INCLUDING THE REDACTED TERMS, HAS BEEN SEPARATELY FILED WITH THE SECURITIES &
EXCHANGE COMMISSION.

                      OBJECTIVE SYSTEMS INTEGRATORS, INC.
                               LICENSE AGREEMENT

                               CONTRACT No.:  325

THIS MASTER AGREEMENT ("Agreement") is entered into as of March 28, 2000
("Effective Date"), between OBJECTIVE SYSTEMS INTEGRATORS, INC. ("OSI"), and
VoiceStream Wireless Corporation. ("Licensee").

1. DEFINITIONS
   -----------

   (a)  Application Component.  OSI Software, other than NetExpert VSM Core
        ---------------------
        Products, licensed as a single off-the-shelf application component such
        as FM Exel(TM), including only those off-the-shelf Rulesets provided as
        part of that application component.

   (b)  Combined Software.  Computer code, modules, programs, data files or
        -----------------
        rules, including related documentation, resulting from (1) some or all
        of the same being linked, combined or otherwise operated with OSI
        Software, or (2) Licensee's modification of OSI Software.

   (c)  Deliverables.  Materials such as OSI Software and Manuals specifically
        ------------
        described as deliverables in a Statement of Work.

   (d)  Information.  Written, machine-reproducible and visual materials that
        -----------
        are described in this Agreement, or are clearly marked when disclosed,
        as being confidential, together with all written, visual and oral
        materials so identified in writing within 30 days after their
        disclosure.

   (e)  Installation Date.  The business day OSI declares Products ready for use
        -----------------
        if installed by OSI, or the business day after Products are delivered,
        if they are to be installed by Licensee.

   (f)  Licensee Software.  Computer code, modules, programs, data files or
        -----------------
        rules, including related documentation, owned or licensed by a third
        party to Licensee and designed to be linked, combined or otherwise
        operated with OSI Software to augment or enhance it. Licensee Software
        excludes Products.

   (g)  Manuals.  User manuals and similar documentation listed in an Order or
        -------
        supplied with OSI Software or Vendor Software. Manuals do not include
        product and service descriptions, advertising or marketing materials.

   (h)  NetExpert Framework Product.  OSI Software specifically listed in the
        ---------------------------
        Price List as part of the NetExpert(R) network management Framework.

   (i)  New Use.  Use of OSI or Vendor Software:
        -------

        (1) Other than as specifically provided by this Agreement.

   (j)  Order.  The form attached as Exhibit 1, as from time to time submitted
        -----
        by Licensee and accepted by OSI to acquire licenses for Products under
        the terms of this Agreement. If the terms of an accepted Order directly
        conflict with the terms of this Agreement (including, without
        limitation, the form attached as Exhibit 1, the terms of the accepted
        Order will govern.

   (k)  OSI Software.  Computer code, modules, programs, data files and rules
        ------------
        listed as OSI Software in the Price List, or provided to Licensee by OSI
        as Deliverables or otherwise in connection with Services or otherwise.
        OSI Software does not include Vendor Software.

   (l)  Price List.  The OSI price list in effect on the date an Order is
        ----------
        accepted and approved for use in the region where the Products are to be
        installed. Subject to the restrictions set forth herein or otherwise
        agreed upon in writing by the parties, OSI may change the Price List,
        including available Products, specifications and prices, on notice to
        Licensee.

   (m)  Products.  OSI Software, other Deliverables, Vendor Software and
        --------
        Manuals.

   (n)  Professional Services.  The Services described in a Statement of Work.
        ---------------------
<PAGE>

   (o)  Ruleset.  A group of instructions which, when taken as a whole,
        -------
        constitute a decision-making matrix used to direct the functions of
        NetExpert Framework Products for a specific network element, management
        operation or other application.

   (p)  Services.  Professional Services and Support Services.
        --------

   (q)  Statement of Work.  A description of Professional Services attached to a
        -----------------
        Work Order which is made a part of this Agreement.

   (r)  Support Services.  The update and support services described in Exhibit
        ----------------
        2.

   (s)  Vendor. A third party which directly or indirectly provides software
        ------
        embedded in OSI Software or Vendor Software.

   (t)  Vendor Software.  Computer code, modules, programs, data files or rules
        ---------------
        listed as Vendor Software on the Price List or provided to Licensee by
        OSI as separately packaged software in connection with Services or
        otherwise.

   (u)  Work Order.  A document executed by the parties which sets forth the
        ----------
        terms upon which Professional Services will be provided by OSI to
        Licensee, including the Statement of Work. If the terms of a Work Order
        directly conflict with the terms of this Agreement, the terms of the
        Work Order will govern.

2. ORDER, PRICE, PAYMENT
   ---------------------

   (a)  Orders.  Licensee will use the Order attached as Exhibit 1 to order OSI
        ------
        Software, professional services and maintenance and support services.
        Licensee has the option to use or not use OSI's professional services.
        If Licensee elects to order professional services from OSI during the
        life of this Agreement, it will use the form of Order illustrated at
        Exhibit 1.

   (b)  Price.  For the Order identified above, Licensee agrees to pay to OSI
        -----
        the price stated at Exhibit 1 for the OSI software encompassed by this
        Agreement. Exhibit 1 includes the price for professional services should
        Licensee elect to purchase professional services from OSI.. Professional
        Services charges will be billed according to the applicable Work Order,
        or if not otherwise specified, then according to OSI's then-current time
        and materials rates, minimums and other terms. If a Work Order is priced
        on a time and materials basis with a not-to-exceed amount, OSI will use
        all reasonable efforts to complete the work described in the Work Order
        for that amount, and OSI will provide advance notice to Licensee if that
        work will not be completed for that amount. On receipt of that notice,
        Licensee may determine whether to continue the work or to accept the
        work in its then-current form and terminate further work under that Work
        Order. Support Services will be billed at the then-current rates.

   (c)  Due Date.  Except as set forth in an Order or a Work Order, Licensee
        --------
        will be invoiced for payment no earlier than the Acceptance date as
        specified in Section 6(b). Except as set forth in an Order or Work
        Order, payment is due (*) days after the invoice date. Charges incurred
        on a monthly or other periodic basis are payable in advance on the first
        day of the applicable period unless otherwise agreed in an Order.

   (d)  Payments.  Payments for OSI products and services will be made in
        --------
        immediately available U.S. funds, without withholding for Taxes or other
        amounts. Amounts not paid within (*) days of when due will accrue
        interest at the lesser of (*) per month or the highest rate permitted
        by applicable law. Licensee will reimburse OSI for all fees, costs and
        expenses (including reasonable attorneys' fees and court costs) incurred
        to collect undisputed but unpaid amounts.Amounts invoiced to VoiceStream
        by OSI become final unless disputed in writing within thirty (30) days
        after the date of OSI's invoice. The "undisputed" portion of an OSI
        invoice is the portion excluded from a written statement from
        VoiceStream to OSI stating any disputed amount of an OSI invoice.
        VoiceStream's written statement of the amount disputed must be itemized
        with specificity so that OSI can understand the nature of the dispute on
        the face of the statement of dispute ("statement of amount disputed").
        VoiceStream's statement of amount disputed must be provided to OSI prior
        to the due date for payment of the OSI invoice to which the statement of
        amount disputed relates. If VoiceStream fails to provide the statement
        of amount disputed by the deadline described in this Section 2(d),
        VoiceStream waives any claim of any disputed amount related to the
        invoice.

   (e)  Taxes, Charges.  Prices are exclusive of, and Licensee will pay, all
        --------------
        sales, value-added, withholding or excise taxes, import duties and other
        government fees and charges of any nature whatsoever other than taxes
<PAGE>

        on the income of OSI ("Taxes"). Taxes paid or payable by OSI will be
        invoiced to and paid by Licensee. If Licensee is obliged to make any Tax
        or other withholding on or in relation to any payment due OSI under this
        Agreement, the amount due will be deemed to be that which, having been
        grossed-up and the applicable tax having been withheld, will yield OSI
        the same amount as it would have received had no Tax withholding been
        made. Prices are quoted exclusive of, and Licensee will pay, applicable
        freight and insurance charges.

   (f)  Right to Offset.  OSI may offset any amount owed by Licensee under this
        ---------------
        Agreement against any amounts OSI owes Licensee for any reason. Licensee
        may offset any amount owed by OSI to Licensee for any reason against any
        amount Licensee owes OSI under this Agreement.

   (g)  Audits.  On reasonable notice but no more than one time per quarter and
        ------
        after signing Licensee's standard nondisclosure agreement, OSI may use
        an independent auditor to inspect Licensee's facilities (including
        computers) and applicable records only to verify Licensee's proper use
        of and payment for all Products and Services. Licensee will keep records
        regarding its use of the Products in sufficient detail to permit that
        verification. If, following an audit, the independent auditor determines
        that there has been an underpayment of any amounts due, OSI will invoice
        Licensee for and Licensee will pay the amount of the underpayment plus
        interest as provided in Section 2(d) from the date each payment was due.
        If the underpayment for items under any Order was more than (*) percent
        of the amount actually due, OSI will also invoice Licensee for and
        Licensee will also pay OSI's actual inspection expensesand a (*)
        surcharge on the underpaid amount. If, following an audit, the
        independent auditor determines that there has been an overpayment of any
        amounts due, Licensee will invoice OSI for and OSI will pay the amount
        of the overpayment less the amount of OSI's actual audit expenses.

3. DELIVERY
   --------

   (a)  Delivery.  Except as set forth in a Work Order or notice from Licensee,
        --------
        OSI will pack and ship the Products according to its standard practice,
        F.O.B. factory, with freight and insurance prepaid and invoiced to
        Licensee. Licensee will reimburse OSI for any extra costs incurred to
        comply with Licensee's special packing and shipping arrangements.
        Scheduled delivery dates are only estimates. Each shipment is a separate
        sale obligating Licensee to pay OSI whether the shipment fully or
        partially fulfills an Order. Licensee has 60 days from receipt to verify
        that all Products have been received. OSI will replace missing Products
        (including all shipping) at no charge.

   (b)  Title, Risk of Loss.  Licensee will not acquire title to Products. Risk
        -------------------
        of loss for the Products will pass to Licensee when received by Licensee
        at its facility.

   (c)  Modifications and Cancellation.
        ------------------------------

        (1)  Professional Services to be provided under a Statement of Work may
             be canceled either (a) on 45 days notice by Licensee, or (b)
             immediately upon Licensee's written notice to OSI of a material
             breach of this Agreement by OSI, but Licensee will pay for all
             Professional Services properly provided by OSI through the date of
             cancellation at OSI's then-current time and materials rates
             (subject to the limitations of Section 2(b) and not to exceed the
             total amount due under that Statement of Work) and all costs
             reasonably incurred by OSI in connection with that cancellation.

        (2)  Professional Services can be modified by written notice from
             Licensee at any time. OSI will notify Licensee of any proposed
             increase in costs, delay in schedule or other consequence from that
             request, Licensee will notify OSI of any proposed decrease in
             costs, acceleration in schedule or other consequences, and the
             change will be implemented if the parties agree to a modification
             to the terms of the Statement of Work.

        (3)  If Licensee modifies or cancels an Order for Products without cause
             or without the required notice, Licensee will pay OSI's out-of-
             pocket expenses incurred in connection with the modification or
             cancellation.

4. TERM; TERMINATION
   -----------------
<PAGE>

   (a)  Term.  This Agreement will commence on the Effective Date and
        ----
        remain in effect for 24 months ("Term"), and unless sooner terminated,
        will automatically be renewed on a month-by-month basis until either
        party provides the other with 30 days' notice of its intention not to
        renew.

   (b)  Termination of Agreement.  This Agreement may be terminated
        ------------------------
        (1) by either party on breach by the other party remaining uncured 30
        days after notice specifying the breach with particularity or (2) by
        notice if the other party becomes insolvent, bankrupt or makes an
        assignment for the benefit of creditors.

        (c)  Survival.  On expiration of the Term or termination of this
             --------
        Agreement for any reason, the obligations of Licensee to pay amounts
        properly owed to OSI and the obligation of each party to discharge any
        liability or other obligation incurred before expiration or termination
        will survive, together with the provisions of the following Sections:
        2(b)-(h), 4(d), 5 and 7-11.

        (d)  Termination of Licenses.  The licenses granted in Section 5(b)
             -----------------------
        will terminate upon the earliest of the following to occur: (1)
        termination of this Agreement by OSI under Section 4(b) (2) any
        violation by Licensee of Section 5(h), (3) notice from Licensee or (4)
        expiration of the term otherwise expressly agreed upon by the parties.
        On termination of any license under this Section, Licensee will
        immediately destroy or return to OSI all copies of the Product then in
        its possession or under its control. Licensee will have no continuing
        rights to that Product, whether alone or as part of Combined Software.

5. LICENSES
   --------

   (a)  General.  This Section sets forth the rights granted to Licensee for the
        -------
        Products identified at Exibit 1.(*) The parties agree that OSI may
        conduct the audit(s) as provided in Section 2(g) above. Vendor Software
        may be subject to additional license restrictions and rights specified
        in licensing documents accompanying the Products. Except for Rulesets
        which are provided in NetExpert(R)'s 4GL programming language and
        "API's" and "header files" for which source code is provided, Licensee
        will receive only an object code license for Products.

   (b)  License Grant.  Subject to the terms of this Agreement, OSI grants
        -------------
        Licensee and Licensee accepts a perpetual, United States wide, personal,
        non-transferable (except as provided herein), non-exclusive license,
        without the right to sublicense, to load, install, execute, display and
        store OSI and Vendor Software only within the United States solely for
        its own internal use and to use the Manuals and Deliverables other than
        OSI Software for that purpose. Subject to the terms of this Agreement,
        Licensee may also (1) modify rules and data files included in OSI
        Software, and (2) modify OSI Software, link, combine or otherwise
        operate OSI and Vendor Software with Licensee Software and use the
        resulting Combined Software solely for Licensee's internal purposes.
        Except as expressly provided herein no other rights are granted to
        Licensee.

   (c)  Term, Limitations.  The term of the license granted in Section 5(b) will
        -----------------
        continue perpetually until terminated under Section 4(d), but Support
        Services will only be provided under Exhibit 2 while Licensee has a
        current Support Services subscription. Licensee will not, nor will it
        permit others to, use Products to develop code, objects, modules or
        programs which modify or substitute for code, objects, modules or
        programs in the Products. OSI and its Vendors retain title to all
        Products and all legally protected rights in Products, subject only to
        the licenses granted under this Agreement. Unless expressly disclosed
        and agreed to by Licensee, and except for OSI authorization codes
        designed to protect against non-OSI access to OSI Software Product
        source code and for OSI license keys used to make OSI Software Products
        "functional" for Licensee, Products may not contain authorization codes,
        lockout software or both to restrict their operation to properly
        licensed uses.

   (d)  Intellectual Property.  Products are copyrighted.  Licensee will not
        ---------------------
        sublicense Products and will not copy, alter, adapt, modify or make
        derivative works of Products except as expressly permitted by this
        Section. Licensee may make a reasonable number of backup and archival
        copies of OSI and Vendor Software for "cold backup" only (i.e., only one
        copy may be in use in any fashion at any time), provided that all
        copyright, patent, trademark and other proprietary notices on and in the
        Products are simultaneously copied. Licensee may make a reasonable
        number of copies of Manuals under the terms of this Agreement solely for
        the purposes permitted in Section 5(b). Licensee will not alter or
        remove any copyright, patent, trademark or other proprietary notice from
        the Products. Products may contain processes and techniques that are
        protected by patents. No license to use these processes and techniques
        apart from the Products is granted. Licensee will not acquire any right
        to the trademarks or tradenames of OSI and its Vendors. Licensee will
        not use, apply to register or register a trademark or trade name which
        is the same as or confusingly similar to any used by OSI or a Vendor.
<PAGE>

   (e)  Transfer to Alternative or Additional Computes.  Licensee will need to
        ----------------------------------------------
        provide notice to and obtain the requisite authorization codes from OSI
        before a transfer is affected.

   (f)  Reverse Engineering., Except for Rulesets which are provided in
        -------------------
        NetExpert's 4GL programming language and except for "API's" and "header
        files", Licensee will not, and waives to the fullest extent permitted by
        law any right to, reverse engineer, decompile or disassemble or
        otherwise attempt to derive the source code for or operation of OSI
        Software and Vendor Software, or to decode, de-encrypt or engineer
        around any authorization codes, lockout software or other security
        measures contained in the OSI Software.

   (g)  Use of Products to Provide Services to Third Parties.  Except as
        ----------------------------------------------------
        provided in Section 5(h), Licensee will not use Products to provide
        network management or operations support services to any third party,
        whether on its own network, through its own network elements, on the
        network of a third party, through the network elements of a third party,
        or otherwise, without executing a network services agreement with OSI
        and complying with the terms of that agreement.

   (h)  Transfers.  Except as provided for under Section 12 of this Agreement,
        ---------
        Licensee will not rent, license, sell or otherwise transfer any portion
        of the Products. Any purported transfer not provided for under Section
        12 of this Agreement will be void, will be a breach of this Agreement
        and will cause the licenses granted in this Agreement to automatically
        terminate.

        Further notwithstanding the foregoing, Licensee may assign its rights
        and obligations hereunder to one or more of the following entities: (i)
        Cook Inlet/VoiceStream PV/SS PCS, LLC (ii) Cook Inlet/VoiceStream PCS,
        LLC (iii) Cook Inlet/VoiceStream GSM II PCS, LLC, or (iv) Cook
        Inlet/VoiceStream GSM III PCS, LLC (collectively "Cook Inlet/VoiceStream
        LLCs"), so long as Licensee owns no less than a 49.9% interest in the
        assignee(s) Cook Inlet/VoiceStream LLC(s) at the time of the assignment.

   (i)  Reservation of Rights, Third Party Beneficiaries.  Except as set forth
        ------------------------------------------------
        in this Agreement, OSI reserves to itself and Vendors all rights to
        engage in activities which, absent a grant of rights, would give rise to
        liability for infringement of intellectual or intangible property
        rights. Oracle Corporation is a third party beneficiary of this
        Agreement and may directly enforce its rights under this Agreement and
        in its intellectual property directly against Licensee.

   (j)  Underlying Licenses; Licensee Software.  Licensee will ensure that valid
        --------------------------------------
        licenses for all required third party software are properly obtained and
        in place. Licensee Software is copyrighted, and OSI has no rights or
        licenses therein. Licensee and its Vendors retain title to all Licensee
        Software and all legally protected rights in the Licensee Software.
        Except as set forth in this Agreement, Licensee reserves to itself and
        Vendors all rights to engage in activities which, absent a grant of
        rights, would give rise to liability for infringement of intellectual or
        intangible property rights.

6. INSTALLATION, ACCEPTANCE, SUPPORT, TRAINING
   -------------------------------------------

   (a)  Installation and Control.  Except as set forth in a Statement of Work,
        ------------------------
        OSI has no responsibility for installing, testing, managing or
        controlling the Products.

   (b)  Acceptance. For Products on the Price List and any other Product not
        ----------
        provided under a Statement of Work, the Product will be accepted if it
        performs substantially as described in its Manual in effect at the time
        of delivery ("Documentation"). Deliverables will be accepted if they
        substantially conform to the specifications set forth in the applicable
        Statement of Work or in a requirements document provided as a
        Deliverable under a Statement of Work. Services. Exhibit 2 contains the
                                               --------
        terms upon which OSI will provide Support Services at Prices set forth
        in the Price List. Professional Services will be provided by OSI to
        Licensee under consecutively numbered Work Orders entered into by the
        parties under and made part of this Agreement.

   (c)  Training.  Except as set forth in a Work Order or other Exhibit to this
        --------
        Agreement, OSI and Vendor training will be at an additional fee in
        accordance with the provider's rates then in effect, and subject to the
        provider's cancellation policies, Licensee will reimburse OSI and its
        Vendors for all reasonable preapproved travel and other out-of-pocket
        expenses incurred by them in connection with any training they may
        furnish.

7. OWNERSHIP, PROPRIETARY RIGHTS
   -----------------------------

   (a)  Ownership.  All right, title and interest to copyrights, trade secrets,
        ---------
        patents and other intellectual property rights (1) in the Products will
        remain the exclusive property of OSI and its Vendors, as applicable, and
        (2)
<PAGE>

        in Licensee Software will remain the exclusive property of Licensee. For
        Combined Software, the parties will each retain full and exclusive
        rights to those portions of their respective software that are
        incorporated into the Combined Software. Combined Software will not be a
        joint work, and upon termination of the License to any Product included
        in Combined Software, Licensee's right to use that Product even as part
        of Combined Software will terminate, and OSI's right to use any portion
        of the Combined Software created or owned by Licensee will terminate.
        Licensee shall own all rights and title to the source code to any
        software Licensee properly develops under this Agreement.

   (b)  Proprietary Rights.  All aspects of OSI Software and Vendor Software,
        ------------------
        including programs, methods of processing, program design and structure,
        the interaction and unique programming techniques they employ and their
        screen formats, are Information and will (1) remain the exclusive
        property of OSI or its Vendors, (2) not be used except as permitted by
        this Agreement, and (3) not be disclosed or otherwise communicated by
        Licensee, directly or indirectly, to anyone except as permitted by this
        Agreement. All aspects of Licensee Software Software, including
        programs, methods of processing, program design and structure, the
        interaction and unique programming techniques they employ and their
        screen formats, are Information and will (1) remain the exclusive
        property of Licensee, (2) not be used except as permitted by this
        Agreement, and (3) not be disclosed or otherwise communicated by OSI,
        directly or indirectly, to anyone except as permitted by this Agreement.

8. REPRESENTATIONS & WARRANTIES
   ----------------------------

   (a)  Limited OSI Representations and Warranties. OSI represents and warrants
        ------------------------------------------
that except as set forth in Section 8(b):

        (1)  (*)

        (2)  For any OSI Software covered by Support Services, and for any
             period of extended warranty, until December 31, 2000, OSI Software
             will include Year 2000 capabilities such that in the normal
             operation of OSI Software: (1) values for current dates before,
             during and after the Year 2000 will not cause interruptions in
             normal operation, except that because of UNIX limitations, current
             dates greater than or equal to 2038 cannot be supported on 32 bit
             machines, or 64 bit machines using 32 bit dates, (2) manipulation
             of date-related data will produce desired results before, during
             and after the year 2000 and management of stored dates greater than
             or equal to 2038 will not cause problems on 32 bit machines, (3)
             date elements in interfaces and data storage will permit
             specification of century to eliminate date ambiguity, (4) for any
             date element represented without century, two digit years greater
             than or equal to 69 will convert to 19xx and two digit years less
             then 69 will covert to 20xx, and (5) leap years will be properly
             processed and recognized. No warranty is provided for any date
             related problems caused by Vendor Software, or by any other
             software or any hardware connected to OSI Software. The Services
             and Products will not infringe any trade name, trademark, service
             mark, copyright, patent, trade secret, literary, dramatic or
             intellectual property right of any third party, or infringe upon
             the right of privacy or publicity of any person or entity, or
             constitute a libel or slander of any person or entity.

        (3)  The Services and Products will conform in all material respects
             will the slated requirements of this Agreement. All Services
             provided by OSI will be performed in a professional manner and
             shall be of a high grade, nature, and quality.

        (4)  (*)

   (b)  Mutual Representations and Warranties.  OSI and VoiceStream each
        -------------------------------------
        represent and warrant that:

        (1)  Their execution, delivery, and performance of this Agreement (i)
             have been authorized by all necessary action, if any; (ii) do not
             violate any law, rule, or regulation or the terms of any order,
             judgment, or decree to which either party is subject, or the terms
             of any material agreement to which either party or any of its
             assets may be subject; and (iii) are not subject to the consent,
             approval, or other action of any third party.

        (2)  This Agreement is a valid and binding obligation of each party
             enforceable against each party in accordance with its terms.

        (3)  Each party shall have, obtain and maintain all proper business
             registrations or licenses required by federal, state or local law,
             and, on behalf of itself and its employees, shall pay all income
             taxes, unemployment taxes, social security, workers' compensation
             insurance, or other similar taxes, expenses or deductions arising
             from its activities under this Agreement.

   (c)  Modifications and Vendor Software.  OSI makes no warranty as to any
        ---------------------------------
        portion of OSI Software that is modified, altered or combined with any
        other software, such as Rulesets, by any party other than OSI or its
        agents or representatives, and as to any of the related Manual
        provisions, or as to any of the Vendor Software and related Manuals. OSI
        will transfer to Licensee any assignable warranties that OSI receives
        from Vendors for Vendor Software. OSI will cooperate with Licensee to
        obtain warranty service for Vendor Software as reasonably necessary.

   (d)  Pre-Release OSI Software.  Pre-Release OSI Software (such as "alpha" or
        ------------------------
        "beta" versions of new or existing OSI Software) may be provided in
        OSI's discretion to Licensee solely as an accommodation for its
        evaluation, comment and familiarization. Pre-Release OSI Software is
        provided without warranty of any nature. In particular, Pre-Release OSI
        Software may contain bugs and inoperable features that may not be
        corrected by OSI, and OSI may change Pre-Release OSI Software
        significantly prior to commercial release, or even not produce a
        commercial product based on Pre-Release OSI Software.

   (e)  Warranty Limitations.  SECTIONS 8(a), (b) AND (c) CONTAIN THE EXCLUSIVE
        --------------------
        WARRANTIES FOR PRODUCTS AND SERVICES. EXCEPT FOR THOSE WARRANTIES,
        PRODUCTS AND SERVICES ARE PROVIDED "AS-IS." NO OTHER WARRANTY, ORAL OR
        WRITTEN, IS EXPRESSED OR IMPLIED. EXCEPT TO THE EXTENT EXPRESSLY
        PROVIDED HEREIN, OSI DOES NOT WARRANT THAT (1) ANY PRODUCT OR SERVICE
        WILL MEET LICENSEE'S REQUIREMENTS, (2) THE PRODUCTS WILL PERFORM IN
        EVERY OPERATING ENVIRONMENT, (3) THE OPERATION OF THE PRODUCTS WILL BE
        UNINTERRUPTED OR
<PAGE>

        ERROR FREE, OR (4) ANY DEFECT OR MALFUNCTION IN THE PRODUCTS OR SERVICES
        IS CORRECTABLE OR WILL BE CORRECTED. OSI SPECIFICALLY DISCLAIMS THE
        IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        PURPOSE . The limited warranty provided in this Section 8 will not apply
        to, and OSI will have no warranty obligation with respect to, any defect
        or malfunction (1) to the extent it results from (A) improper
        modification or use by Licensee, or (B) hardware, software, interfacing
        or supplies other than those provided by OSI in the form provided by
        OSI, or (C) any cause other than ordinary use or (2) with respect to the
        warranties set forth in Section 8(a)(*), (2), (6), (8) and (9), for
        which OSI or Licensee (A) is unable to reproduce the nonconformity, (B)
        OSI is not provided with a description of the parameters, procedures or
        conditions which generate the problem in sufficient detail to permit
        isolating the code which causes the problem or (C) OSI is not provided
        with all data files, rules, Licensee Software and system access
        reasonably required to reproduce and analyze the problem.

9. LIMITATIONS, REMEDIES
   ---------------------

   (a)  Exclusive Remedies.  Licensee's sole remedy for a breach of the limited
        ------------------
        warranty in Section 8(a) will be for OSI to use commercially reasonable
        efforts to restore the Products to substantially conforming condition
        under the terms of Exhibit 2, or if OSI is unable after such efforts to
        so restore the Products, then for Licensee to obtain a full refund of
        the purchase price of the Products upon return of those Products to OSI
        and written certification by Licensee that it will no longer use the
        returned Product in any manner whatsoever.

   (b)  Non-Standard Uses.  Products are designed for standard commercial
        -----------------
        applications such as communications networks only and are not intended
        for planning, construction, maintenance or direct operation of critical
        systems or facilities, such as aircraft control systems and nuclear or
        hazardous waste facilities. Licensee will not use Products for such non-
        standard applications without OSI's prior consent, which will require
        additional contractual safeguards. If Licensee uses Products in such a
        non-standard application, it will be solely liable for the use and will
        indemnify and hold OSI harmless from all loss, damage, expense or
        liability in connection with that use.

   (c)  Aggregate Liability.  NEITHER PARTY WILL BE LIABLE FOR DAMAGES IN EXCESS
        -------------------
        OF THE AMOUNTS PAID TO OSI FOR THE PRODUCTS OR SERVICES HEREUNDER (*).
        THIS LIMITATION WILL (1) APPLY REGARDLESS OF THE FORM OF ACTION, WHETHER
        CONTRACT OR TORT, INCLUDING NEGLIGENCE AND STRICT LIABILITY, AND (2) NOT
        APPLY TO INDEMNITY UNDER SECTION 10 OR TO LIABILITY FOR REAL PROPERTY
        DAMAGE, DEATH OR BODILY INJURY CAUSED BY THE GROSS NEGLIGENCE OR WILLFUL
        MISCONDUCT OF THE LIABLE PARTY OR ITS VENDORS.

   (d)  Damages.  NEITHER PARTY WILL BE LIABLE, REGARDLESS OF THE FORM OF
        -------
        ACTION, FOR LOST DATA, REVENUES, PROFITS OR SAVINGS, OR FOR INDIRECT,
        CONSEQUENTIAL, INCIDENTAL, SPECIAL OR PUNITIVE DAMAGES, EVEN IF THE
        PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF THE DAMAGES.

   (e)  Time to Bring Claim.  No action will be brought against either party
        -------------------
        more than 18 months after the cause of action first arises.

10. INFRINGEMENT INDEMNITY
    ----------------------

    (a)  Indemnification by OSI.
         -----------------------

         (1)  OSI will defend Licensee against any claims, and indemnify and
              hold Licensee harmless against any judgments, directly or
              indirectly resulting from a claimed infringement or violation of
              any copyright, patent or other intellectual property right with
              respect to OSI Software arising under the laws of the United
              States of America or the State of Washington. OSI will have no
              liability for any such claims or judgments to the extent that they
              are based on (a) the actions of Licensee, its employees or agents,
              (b) use of a version, modification or adaptation of OSI Software,
              if the infringement would have been avoided by the use of a then-
              current unaltered release of OSI Software, (c) use of Combined
              Software, if OSI Software operated independent of the Combined
              Software is not the cause of the infringement, or
<PAGE>

              (d) use of OSI Software in combination with any computer software,
              hardware or data not delivered in that combination by OSI.

        (2)   On receiving notice of a claimed infringement, and without
              limiting its indemnification and hold harmless obligations as
              stated in Section 10(a)(1), OSI may (a) settle on terms that
              permit continued use of OSI Software, (b) discontinue distribution
              of the OSI Software that is the cause of the claim and provide a
              substitute for that OSI Software, (c) modify OSI Software to be
              non-infringing, or (d) if the foregoing remedies are not
              reasonably available, grant Licensee (i) a full refund for all OSI
              software license fees paid to OSI between the effective date of
              this Agreement and the date that the foregoing remedies are
              determined to be "not reasonably available" if such determination
              is made no later than 2 years from the effective date of this
              Agreement or (ii) alternatively, if such determination is made
              after 2 years from the effective date of this Agreement, a credit
              for the amounts paid for the depreciated value of the relevant
              portion of OSI Software (based on a (*) month life beginning on
              the date of delivery to Licensee) and accept its return.

        (3)   THIS SECTION PROVIDES LICENSEE'S SOLE AND EXCLUSIVE REMEDY AGAINST
              OSI FOR INFRINGEMENT OF PATENTS, COPYRIGHTS OR OTHER INTELLECTUAL
              PROPERTY RIGHTS.

   (b)  Indemnification by Licensee.  Licensee will defend OSI and its Vendors
        ---------------------------
        against any claims, and indemnify and hold OSI and its Vendors harmless
        against any judgments, directly or indirectly resulting from any claimed
        infringement or violation of any copyright, patent or other intellectual
        property right with respect to Products to the extent that Licensee
        Software or any of the acts described in Section 10(a)(1) is the cause
        of the claimed infringement or violation. THIS SECTION PROVIDES OSI'S
        SOLE AND EXCLUSIVE REMEDY AGAINST LICENSEE FOR INFRINGEMENT OF PATENTS,
        COPYRIGHTS OR OTHER INTELLECTUAL PROPERTY RIGHTS.

   (c)  Cooperation.  Notwithstanding the above, an indemnifying party is under
        -----------
        no obligation to defend or indemnify another party unless: (1) the
        indemnifying party has been promptly notified of the claim or suit and
        furnished with a copy of each material pleading, communication, notice
        and other action relating to the claim or suit; (2) the indemnified
        party permits the indemnifying party, at the indemnifying party's
        expense, to assume sole authority to conduct the trial or settlement of
        the claim or suit and any negotiations related to it; and (3) the
        indemnified party promptly provides all information and assistance
        reasonably requested by the indemnifying party in connection with the
        claim or suit, all at the indemnifying party's expense for the
        indemnified party's out-of-pocket expenses.

11.  GENERAL
     -------

     (a) Confidential Information.  In the course of their dealings, each party
         ------------------------
         will acquire Information about the other, including Information
         regarding business activities and operations, technical information and
         trade secrets of the party and its partners. Each party will hold in
         confidence any Information that it receives from the other party, not
         use that Information for purposes other than performance of this
         Agreement and not disclose the Information except to those employees
         and advisors who (1) have a need to know the same, and (2) are bound by
         law or have agreed in writing to maintain the Information in
         confidence. Information includes all nonpublic aspects of the Products,
         including programs, methods of processing, program design and
         structure, the interaction and unique programming techniques employed,
         and performance data and test results. It also includes the nonpublic
         plans of each party and Vendors for new products and services, product
         improvements and marketing strategies. If a party discovers Information
         has been improperly used, disseminated or published, it will
         immediately notify the other party and take all reasonable actions to
         minimize the impact of the disclosure.

     (b) Excluded Information.  Even if marked as confidential, the obligations
         --------------------
         in Section 11(a) will not apply to Information generally available to
         or known to the public, known by the receiving party without obligation
         of confidentiality before the negotiations leading to this Agreement,
         independently developed by the receiving party outside the scope of
         this Agreement, lawfully disclosed to the receiving party without
         restriction by a third party having the right to make the disclosure or
         required to be publicly disclosed to a tribunal. In the case of
         required disclosures to tribunals, the receiving party will promptly
         notify the other party of the proceeding and fully assist the
         disclosing party to obtain protective orders maintaining the
         confidentiality of the Information.
<PAGE>

     (c) Compliance with Export and Other Laws. The Products, Services and all
         -------------------------------------
         related rights, technical data and information are subject to export
         controls imposed by the U.S. Government and other countries. Licensee
         will not transmit any Products or information relating to Products or
         Services outside the United States of America, or to any person or
         entity prohibited by the U.S. Government, whether by name, by
         citizenship, residency or otherwise, and will comply with all
         applicable export control restrictions. Each party, at its expense,
         will comply with all applicable laws, regulations, codes and
         ordinances. Neither party will be bound by any provision of this
         Agreement to the extent, but only to the extent, that it violates
         applicable law.

     (d) Notices.  Notices, consents, approvals and communications given under
         -------
         this Agreement will be in writing, in the English language, sent by
         registered or certified mail, return receipt requested, postage
         prepaid, or by a courier service that obtains signed acknowledgement of
         receipt, to the address indicated below the signature block of this
         Agreement or to such other address as the affected party designates by
         prior notice and effective on the date received unless a later date is
         otherwise indicated in the notice, consent or communication.

     (e) Assignment.  Except as provided for under Section 12 of this Agreement,
         ----------
         this Agreement is not assignable by either party without the prior
         consent of the other party. This Agreement will be binding on and inure
         to the benefit of the parties and their respective successors and
         permitted assigns.

     (f) Governing Law.  This Agreement will be governed by and construed in
         -------------
         accordance with the laws of the State of Washington, United States of
         America, excluding choice of law principles. The United Nations
         Convention on Contracts for the International Sale of Goods will not
         apply.

     (g) Arbitration.  Any dispute, controversy or claim arising out of or
         -----------
         relating to this Agreement will be finally resolved by binding
         arbitration under the Rules of Arbitration of the United Nations
         Commission on International Trade Law in effect at the time of the
         arbitration ("UNCITRAL Rules"). There will be three arbitrators
         selected as follows: one arbitrator will be selected by OSI, one
         arbitrator will be selected by Licensee and the third arbitrator will
         be selected jointly by the first two arbitrators, except that if either
         party fails to select an arbitrator within 30 days after initiation of
         arbitration, or if the first two arbitrators fail to select the third
         arbitrator within 45 days after the initiation of arbitration, the
         President of the Washington Bar Association at that time will make the
         selection.

         (1) The venue of the arbitration will be King County, Washington. On
             reasonable notice to the other party and the arbitration panel,
             parties will be entitled to use expert and rebuttal witnesses.

         (2) Each party will pay its own fees and expenses incurred in
             connection with the arbitration. Common expenses of the arbitration
             (such as the fees and expenses of the arbitrators) will be borne by
             the parties in such amounts or proportions as the arbitrators may
             determine.

         (3) The award of the arbitrators will be (a) by majority vote, (b) in
             writing (including reasons), and (c) final and binding on the
             parties. Judgment upon the award may be entered and enforced by any
             court of competent jurisdiction.

         (4) In no event will the arbitrators award damages that are not
             permitted under the express terms of this Agreement.

         (5) Without prejudice to Article 26 of the UNCITRAL rules (Interim
             Measures of Protection), either party may apply to any court of
             competent jurisdiction for such interim relief as it considers
             appropriate, without the need to post bond or other security, or if
             required, then the minimum bond or other security permitted.

     (h) Equitable Relief.  Any breach of a party's obligations with respect to
         ----------------
         intellectual property rights will cause irreparable injury for which
         there are no adequate remedies at law. The aggrieved party will be
         entitled to equitable relief in addition to all other remedies that may
         be available, without the posting of bond or other security, or if
         required, then the minimum bond or security so required.

     (i) Force Majeure.  Neither party will be liable or held in default for a
         -------------
         failure or delay in performing its obligations under this Agreement,
         other than to make payment for amounts owing or to comply with Sections
         5 and 7, due to any cause beyond its reasonable control, so long as the
         party takes all reasonable steps to avoid and minimize the impact of
         such cause.
<PAGE>

     (j) Entire Agreement.  This Agreement, including its Exhibits, constitutes
         ----------------
         the entire agreement between the parties with respect to its subject
         matter and supersedes all prior communications, both oral and written,
         between the parties. Additionally, the terms and pricing regarding OSI
         maintenance and support services stated in this Agreement replace the
         terms and pricing regarding OSI maintenance and support services stated
         in the End User License Agreement, OSI Contract Number EUA-150, dated
         June 26, 1996 between OSI and Omnipoint Communications, Inc., as that
         End User License Agreement has been amended and supplemented by
         addenda. Except as set forth in Section 11(k), this Agreement may not
         be modified, and no rights will be waived, except by an instrument in
         writing signed by a duly authorized representative of both parties. If
         the terms of this Agreement conflict with the terms of any of its
         Exhibits, the Exhibits will prevail. As used in this Agreement, the
         term "including" means by way of example and not limitation.

     (k) Modifications to Exhibits.  If a change to Exhibit 2 materially reduces
         -------------------------
         Support Services during a period for which Licensee has already paid
         fees for those Support Services, Licensee may terminate those Support
         Services for the remainder of the period and receive a pro rata refund.
         Waivers. No waiver by a party of a breach of this Agreement will
         -------
         constitute a waiver of any other breach of the same or any other
         provision of this Agreement.

     (l) Execution.  Neither this Agreement or any modification of it will be
         ---------
         binding on either party unless it has been signed on behalf of such
         party by one of its Executive Officers. This Agreement may be executed
         in multiple counterparts, each of which will be deemed an original and
         all of which will constitute together one agreement. A counterpart
         delivered to a party by facsimile or similar electronic means will be
         deemed an original, equivalent in all respects to a manually executed
         counterpart.

     (m) Intentional Risk Allocation.  The provisions of this Agreement reflect
         ---------------------------
         an informed, voluntary allocation between the parties of the risks
         (known and unknown) that may exist in connection with this Agreement.
         This voluntary allocation was a material part of the bargain between
         the parties and the economic and other terms were negotiated and agreed
         to by the parties in reliance on that allocation.

     (n) Independent Contractors.  The parties are independent contractors.
         -----------------------
         Under no circumstances will the employees of one party be deemed the
         employees of the other for any purpose. This Agreement does not grant
         authority for either party to act for the other in an agency or other
         capacity, or to make commitments of any kind for the account of or on
         the behalf of the other.

     (o) Severability.  If any provision of this Agreement is determined to be
         ------------
         invalid or unenforceable, it will be deemed to be modified to the
         minimum extent necessary to be valid and enforceable. If it cannot be
         so modified, it will be deleted and the deletion will not affect the
         validity or enforceability of any other provision unless, as a result,
         the rights of either party are materially diminished or the obligations
         and burdens of either party are materially increased so as to be unjust
         or inequitable.

     (p) Cumulative Remedies.  Except as otherwise provided, the rights and
         -------------------
         remedies in this Agreement are cumulative and in addition to any other
         remedies available at law or equity.

12. Other (*)

<PAGE>

IN WITNESS WHEREOF the parties have caused this Agreement to be executed by
their duly authorized representatives.

OBJECTIVE SYSTEMS INTEGRATORS, INC.       VOICESTREAM WIRELESS CORPORATION

By:  /s/ Gregg B. Brelsford           By: /s/ Bob Stapleton
     ------------------------------       ----------------------------------

Title: Managing Attorney              Title: President & COO

Date:  March 28, 2000                 Date: March 28, 2000

Address for Notices:

Objective Systems Integrators, Inc.     ________________________________________
101 Park WAy                            ________________________________________
Folsom, CA  95630                       ________________________________________
Attn:  Contracts Administrator          Attn:___________________________________
Business Telephone:   (916) 353-2400    Business Telephone   (____) ____________
Facsimile for Notices: (916) 353-0647   Facsimile for Notices (____)____________
<PAGE>

                                   Exhibit 1(*)
                                   ---------

                                   Exhibit 2
                                   ---------

                                Support Services

1. DEFINITIONS
   ------------

   (a)  Defect.  An error in OSI Software or a failure of OSI Software to
        ------
        conform substantially with its then-current documentationthat can be
        reproduced by OSIor by Licensee for OSI's observation. Defects fall into
        three categories as follows:

        (1) Priority 1 (Production System Failure).  Licensee's primary
            --------------------------------------
            production system (a) is completely unavailable, (b) has a problem
            that occurs with sufficient frequency that the system is effectively
            rendered inoperable, or (c) is affected such that critical business
            processes are unavailable. In each case, no Workaround can be
            immediately identified. For Priority 1 Defects, both OSI and
            Licensee will commit full-time resources to resolve the situation.

        (2) Priority 2 (System Impairment).  Licensee's business processes are
            ------------------------------
            impacted or impaired, but Licensee's primary production system still
            functions.

        (3) Priority 3 (Minor Fault).  A Priority 1 or 2 Defect where a
            ------------------------
            Workaround has been identified, the impact on Licensee is minor, the
            Defect has no material operational impact on Licensee, or the Defect
            does not require immediate attention.

   (b)  Emergency Release.  A new version of OSI Software that incorporates
        -----------------
        Patches to rectify one or more Priority 1 or Priority 2 Defects. An
        Emergency Release may include additional documentation.

   (c)  Patch.  Replacement of, or provision of an addition to, a portion or
        -----
        module of OSI Software. A Patch may include additions or replacement to
        existing documentation

   (d)  Remote Access.  Access to Licensee's systems required by OSI to provide
        -------------
        Support Services, which may include dedicated connection, dial-up modem,
        internet, telnet or other means by which OSI can gain the required
        access.

   (e)  Workaround.  A modification to the procedures Licensee follows or the
        ----------
        data it supplies when using OSI Software. A Workaround is designed to
        enable OSI Software to operate without materially and adversely
        affecting Licensee's ability to use OSI Software in its production
        environment.

2. GENERAL.
   -------

   (a)  NetExpert Framework Products.  Provided Licensee (1) is current in
        ----------------------------
        paying all applicable Support Services charges, as set forth in the
        Price List at the time Support Services charges are incurred, (2) is not
        in material breach of this Agreement, and (3) has provided OSI with
        timely Remote Access to the affected system, OSI will provide to
        Licensee the Support Services specified below. Support Services will be
        provided only for the current generally available release, with all OSI
        recommended NetExpert(R), operating system, database and other patches
        applied; provided, that for six months after the introduction of a new
        release, OSI will use reasonable efforts to support the previous
        release. After that time, OSI will provide Support Services for
        superseded releases on a time and materials basis.

   (b)  Vendor Software.  As part of Support Services, and provided they are
        ---------------
        available for the form of Vendor Software licensed, OSI will procure for
        Licensee's benefit annual maintenance agreements with its Vendors for
        all Vendor Software.
<PAGE>

   (c)  Application Components and Rulesets.  Because Application Components and
        -----------------------------------
        Rulesets may vary between end-users even for the same network element,
        management operation or other operation, and because Application
        Components and Rulesets may be modified by others after delivery by OSI,
        unless otherwise agreed to by OSI in writing, Support Services for
        Application Components and Rulesets are provided only on a time and
        materials basis. The following Sections describe the limited Support
        Services available for Application Components and Rulesets when such
        Support Services are made available by OSI.

3. UPDATE SERVICES
   ---------------

   (a)  NetExpert Framework Product Updates.  On request by Licensee, OSI will
        -----------------------------------
        provide Licensee at no additional cost with new and interim versions of
        NetExpert Framework Products at the time each version is generally made
        available to its other customers. OSI will make such revisions and
        enhancements to NetExpert Framework Products as it deems necessary and
        appropriate. OSI may discontinue updating NetExpert Framework Products
        at any time or may incorporate any portion of existing NetExpert
        Framework Products into a new and distinct Product. In the latter case,
        OSI will offer to make the new Product available to Licensee at its
        then-current Price.

   (b)  Vendor Software Updates.  Vendors will, from time to time, release new
        -----------------------
        products or new or interim versions of Vendor Software that OSI will
        incorporate into or use with OSI Software. OSI will inform Licensee of
        Vendor new releases when, in OSI's judgment, they may be appropriate for
        use in or with OSI Software. For Vendor Software licensed to Licensee by
        OSI, new releases which OSI has the right to sublicense will be made
        available to Licensee in a timely manner consistent with their receipt
        from the Vendor and at OSI's then-current Prices.

   (c)  Application Components and Rulesets.  Generally, Application Components
        ------------------------------------
        and Rulesets are only updated on a time and materials basis.
        Occasionally OSI may update an Application Component or Ruleset for a
        new release of network element software, but unless OSI has agreed
        otherwise with Licensee, that updated Application Component or Ruleset
        will be made available for license by payment of a separate license fee,
        and integration and customization of that Application Component or
        Ruleset into Licensee's system will be required either by OSI, by
        Licensee or by a party contracted by Licensee.

4. EXTENDED WARRANTY SERVICES
   --------------------------

   (a)  Extended Warranty.  By maintaining a current subscription for Support
        -----------------
        Services for a Product, the limited warranty provided in Section 8(a) of
        the Agreement will, subject to the terms of the Agreement, be extended
        as set forth in this Section 4 for that Product.

   (b)  NetExpert Framework Products.  If Licensee believes that there is a
        ----------------------------
        Defect in NetExpert Framework Products Licensee will (1) promptly notify
        OSI, describing the parameters, procedures and conditions that result
        from the Defect in sufficient detail to permit OSI to isolate the code
        that caused the Defect, and (2) provide OSI with all data files,
        database rules, Licensee Software and Remote Access (and where required
        by OSI, onsite access) required to reproduce and analyze the Defect. If
        OSI is unable to reproduce the Defect, it will cooperate with Licensee
        to determine the reason for this inability. If but only if neither party
        is thereafter able to reproduce the Defect within 15 calendar days of
        OSI's receipt of the information required to be provided to OSI pursuant
        to Subsection 4(b)(2), OSI shall have no responsibility to take further
        action.

   (c)  Application Components and Rulesets.  When Support Services are
        -----------------------------------
        available for Application Components or Rulesets, the OSI Extended
        Warranty only covers Application Components and Rulesets in the form
        provided by OSI; on receipt by OSI of the notice described in Section
        4(b), OSI will analyze the Application Component or Ruleset in the form
        provided by OSI to determine if the Defect is reproducible. OSI will
        have no obligation for Defects not in the original Application Component
        or Ruleset provided by OSI.

   (d)  Vendor Software.  For Vendor Software where a support agreement is in
        ---------------
        place between OSI and the Vendor, OSI will use best efforts to verify
        all Defects in the Vendor Software as quickly as is commercially
        reasonable and to obtain a prompt resolution of the Defect from the
        Vendor.

   (e)  Response Times.  On notice of a Defect, OSI will during normal business
        --------------
        hours (unless Extended Services are purchased as described in Section
        4(f)) (1) initiate work to verify the Defect, (2) advise Licensee of its
        plans for resolving the Defect, and (3) use best efforts to resolve the
        Defect, as follows, and OSI will
<PAGE>

        promptly notify Licensee if a Defect cannot be resolved within these
        time periods and will cooperate in good faith with Licensee to arrive at
        an alternative period for resolution:

        (1)  Priority 1.  OSI will promptly initiate work to verify a Priority 1
             ----------
             Defect within two hours of being notified and will attempt to
             resolve the Defect within 5 business days.

        (2)  Priority 2.  OSI will initiate work to verify a Priority 2 Defect
             ----------
             no later than the next business day and will resolve the Defect
             within 10 business days.

        (3)  Priority 3. OSI will initiate work to verify a Priority 3 Defect
             ----------
             within 30 business days and will include a Patch for the Defect in
             the next update or version of OSI Software provided Licensee as
             applicable.

   (f)  Response.  OSI will work diligently to resolve Priority 1 and Priority 2
        --------
        Defects with either Workarounds, Patches or Emergency Releases. Whenever
        a workaround is practical OSI will verbally advise Licensee to the
        effect, followed by a confirmation posted on WebTAC or otherwise
        provided in writing to Licensee. If a Workaround does not resolve the
        Defect, OSI will use best efforts to provide a Patch or Emergency
        Release. If a Workaround is provided and resolves the Defect, it will be
        downgraded to Priority 3.

   (g)  Extended Services.  24 hour-a-day, 7 days-a-week Support Services are
        -----------------
        available for NetExpert Framework Products at an extra charge as shown
        in the Price List. If Licensee purchases this option, the following
        additional Support Services are available for resolution of Priority 1
        Defects:

        (1)  Response.  Licensee will be provided with a support
             --------
             telephone/paging number. OSI will attempt to respond within 15
             minutes of receiving Licensee's call, message or page and will
             promptly initiate work to verify the Priority 1 Defect.

        (2)  Resolution.  OSI will use best efforts to resolve the Priority 1
             ----------
             Defect within 2 hours and, if unable to resolve the Defect within
             that period, will continue diligently to pursue resolution of the
             Defect.

5. GENERAL ASSISTANCE
   ------------------

   As a part of Support Services, OSI will provide Licensee with a reasonable
   amount of generalized advice regarding the proper installation, configuration
   and operation of OSI Software in the form provided by OSI. Additional General
   Support Services are available on a time and materials basis.

6. HOTLINE SERVICES
   ----------------

   Telephone Hotline Support will be available from 6:00 a.m. to 5:00 p.m.,
   Pacific Standard Time, Monday through Friday (excluding OSI holidays) for
   Extended Warranty Services and General Support Services.

7. WEBTAC
   ------

   Subject to system availability, Licensee will have 24 hour-a-day, 7 days-a-
   week access to OSI's Technical Assistance Center on the World Wide Web, URL
   http://tac.osi.com/. Use of OSI's WebTAC is subject to the terms and
   procedures posted on that site.

8. GENERAL MATTERS
   ---------------

   (a)  Contacts and Internal Support.
        -----------------------------

        (1) Licensee will designate a single employee who will be the primary
            contact person and a single employee who will be the backup contact
            person (either of whom is the "Contact Person") for all matters
            related to Support Services. The Contact Person will have
            successfully completed all relevant OSI training. Only the Contact
            Person will be entitled to make use of Extended or Hotline Services
            or OSI's WebTAC.

        (2) All requests for Support Services and other assistance from within
            Licensee's organization will be made through the Contact Person.
            Licensee will be responsible for taking and documenting the
            following actions to the extent reasonable and appropriate prior to
            and after reporting any Defect to OSI, and Licensee will commit
            reasonable appropriate resources to working on the Defect until the
            source of the Defect is agreed upon:
<PAGE>

            (A) Maintaining an up-to-date record of system changes such as
                upgrades, patches and modifications to operating systems,
                databases, device software and Products;

            (B) Gathering all relevant information from the user reporting the
                Defect;

            (C) Identifying the nature of the Defect;

            (D) Reproducing the error and documenting the steps required for
                that reproduction;

            (E) Eliminating physical causes such as connections, device
                malfunctions and memory and CPU problems;

            (F) Examining logs, records, archives, core files and other user
                documentation;

            (G) Reaching where possible a tentative conclusion regarding
                causation;

            (H) Providing OSI with proper remote connectivity and other
                documentation and assistance required in connection with the
                Support Services; and

            (I) To the extent appropriate, interfacing with distributors of
                interfacing systems such as the operating system, database
                programs and other hardware and software, and working with those
                distributors to eliminate or identify errors in their systems.

   (b)  Commencement.  The first year of Support Services for each item of OSI
        ------------
        Software begins on its Installation Date ("Services Commencement").
        Renewal fees will be paid in advance on or before the anniversary of
        Services Commencement. The schedule of renewal fees will be specified in
        the then-current Price List.

   (c)  Comprehensive Coverage.  Because of the interconnection between versions
        ----------------------
        of NetExpert Framework Products and Vendor Software, if Licensee renews
        Support Services on at least one computer for one NetExpert Framework
        Product, Licensee must renew Support Services for all NetExpert
        Framework Products it has licensed. Licensee has the option to purchase
        available Support Services, if any, for all, some or none of the
        Application Components or Rulesets it licenses from OSI.

   (d)  Automatic Renewal.  Support Services will automatically renew each year
        -----------------
        unless Licensee cancels by notice to OSI at least 30 days prior to the
        end of any Support Services year.

   (e)  Cancellation.
        ------------

        (1) Support Services will be canceled as to a Product if and when the
            license granted to Licensee for that Product is terminated. Any
            unearned, prepaid amounts paid for such Support Services shall be
            refunded to Licensee immediately upon such termination.

        (2) Support Services will also be canceled at the end of any annual
            period if Licensee has not paid the applicable renewal fees before
            the end of the term. For a cancellation of this type, Licensee will
            not be entitled to any refund of previously paid fees of any type.

        (3) If Support Services are canceled , they will be canceled, effective
            immediately, for all OSI Software and Vendor Software. Cancellation
            of any Support Services will not, of itself, constitute termination
            of the Agreement.

   (f)  Reinstatement.  Licensee can reinstate Support Services by paying all
        -------------
        Support Services fees that are in arrears, plus any costs, on a time and
        material basis, that OSI incurs to update installations to the current
        version of OSI Software.

   (g)  Modifications and Unauthorized Uses.  OSI will have no obligation to
        -----------------------------------
        support OSI Software if the need for support arises because it (1) has
        been modified by Licensee, or (2) is being used in violation of the
        terms of the Agreement. If a reported Defect is not a Defect in Products
        but is actually a problem caused by user error, modification of Products
        by a party other than OSI, or third party hardware or software other
        than Vendor Software for which Support Services have been purchased, OSI
        will have the right to invoice Licensee on a time and materials basis
        for efforts provided by OSI personnel above 8 hours for each such Defect
        reported to OSI.
<PAGE>

   (h)  Limitations.  (*)
        -----------<PAGE>

                                                                   EXHIBIT 10.10

January 28, 2000

Mr. Bud Mullanix

Dear Bud:

OSI is pleased to confirm our offer of employment to you for the position Vice
President, Human Resources, in our Folsom location.  In this position you will
be reporting to me for a period not to exceed 90 days, after which you will
report to our Co-Chief Executive Officers.  Your anticipated start date will be
February 14, 2000.

   Base Salary:     $130,000 per year.
   Incentive Plan:  OSI's standard Executive Compensation Plan, which currently
                    is structured to pay out 50% of base at target performance.

Option Grant.  At the first meeting of the Board of Directors after your hire
------------
date, and subject to approval of the Board, you will be granted an option to
purchase 50,000 shares of OSI's common stock.  The option price will be the Fair
market Value of OSI stock on the date the Board approves your grant.  Options
will vest over 4 years from the grant date, as follows:  as long as you continue
to meet the vesting requirements in our Option Plan, your right to acquire 25%
of the shares under option will vest 12 months after the grant date, and your
right to acquire 1/48 of the shares under option will vest each month
thereafter.  Vesting will be tolled when you are on a leave of absence except as
otherwise required by law.  This is a general summary.  The actual terms of
option grants are as set forth in the Option Plan and Grant Agreement, both of
which that will be given to you at the time your grant is approved.

Standard Benefits.  Insurance benefits will be effective on the first day of the
-----------------
month following completion of 30 calendar days of employment.  During your first
year, you will earn three weeks of vacation/sick time in accordance with our
standard policies.  You may contribute any amount of your before tax
compensation, subject to the limits imposed by the Internal Revenue Service, to
the OSI 410(k) Plan.  You may also participate in the OSI Employee Stock
Purchase Plan beginning with the first Plan enrollment date after you begin
work.  Enrollment dates for the ESPP are April 30 and October 31.  Finally,
based on our success and profitability, you may receive the benefit of
discretionary contributions to the OSI Profit Sharing Plan.  Provided you
satisfy  the eligibility requirements of that Plan (currently, completion of 90
days of employment and over 1000 hours of service in a Plan year, which runs
from July 1 through June 30), contributions are made at the end of each fiscal
year.

Notwithstanding the above, during the period from the commencement of your
employment with OSI through your eligibility for coverage under OSI's standard
insurance benefits, we will reimburse you for any amounts that are actually paid
by you to obtain extended COBRA coverage for your insurance benefits at your
current employer.

Severance Agreement.  Promptly following your employment, OSI will enter into
-------------------
its standard Severance Agreement with you.  This Agreement provides for certain
salary continuation and other benefit in the event OSI has a Change in Control,
as more particularly defined.  A copy of that Agreement is attached.
<PAGE>

Bud Mullanix
January 28, 2000
Page 2

Representations.  As a condition to our offer of employment, you represent and
---------------
acknowledge that (1) your resume and employment application are complete and
accurate and do not contain any material misstatements, and (2) you have not
been convicted of any crime or found liable criminally or civilly for any action
or omission involving fraud, dishonesty or moral turpitude.

Contingencies.  We reserve the right to investigate your prior employment
-------------
history, personal references and educational background, as well as other
relevant information that is reasonably available to us.  We may also review
your credit report, driving record and criminal background.  Consistent with
legal requirements, your offer of employment is contingent on a satisfactory
background check.  Under the Immigration and Naturalization Act of 1986, your
offer is also contingent on your ability to provide proof of your right to work
and your completion of an INS Form I-9.

Legal Matters.  Please not that, as a condition of employment, you mist enter
-------------
into an agreement to arbitrate all disputes arising out of or related to your
employment.  This includes any issues related to the termination of your
employment and any claims of unlawful discrimination or unlawful harassment,
including sexual harassment.  Only an arbitrator, and not a judge or a jury,
will hear these disputes.  In addition, you must sign the attached Employee
Invention Agreement.

General.  Your employment at OSI will be governed by the traditional legal
-------
principals of employment at will.  Both you and OSI have the right to terminate
the employment relationship at any time, with or without notice and with or
without cause.  Except for the policies of at-will employment and mandatory
arbitration, we reserve the right to modify the terms and conditions of your
employment, including your compensation and your benefits.  You agree at all
times to comply with OSI's policies communicated to you and with all applicable
laws, regulations, codes and ordinances.

OSI is eager for you to join us and encourage you to accept this rewarding and
challenging opportunity.  We would appreciate your signing this letter below and
returning it to the undersigned as soon as possible, along with your signed
Employee Invention Agreement, your signed acknowledgement of our Alternative
Dispute Resolution Policy and your completed I-9.  Please return copies of
supporting identification(s) specified on the Form I-9 or be prepared to provide
them on your first day of employment.

This letter contains all of the details relating to our offer of employment.  No
one has the authority to modify or add new terms or conditions without the
signed approval of an OSI officer.  Please feel free to contact me at (916) 353-
2400, extension 2773, if you have any questions or concerns.  This offer will be
rescinded within seven working days if no reply is received.

Sincerely,                           Accepted by:

/s/ Philip N. Cardman                /s/ Bud Mullanix
----------------------------         ----------------------------
Philip N. Cardman                            Bud Mullanix               Date
Vice President

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