<PAGE>

                                                                    Exhibit 4.4

                     STOCK OPTION AGREEMENT dated as of
                 August 9, 1999 (the "Agreement"), by and
                 between INTERNATIONAL NETWORK SERVICES, a
                 Delaware corporation ("Issuer"), and LUCENT
                 TECHNOLOGIES INC., a Delaware corporation
                 ("Grantee").


                                   RECITALS

          A.  Grantee, Intrepid Merger Inc., a Delaware corporation and a wholly
owned subsidiary of Grantee ("Sub"), and Issuer have entered into an Agreement
and Plan of Merger dated as of the date hereof (as the same may be amended or
supplemented, the "Merger Agreement"; defined terms used but not defined herein
have the meanings set forth in the Merger Agreement), providing for, among other
things, the merger of Sub with and into Issuer, with Issuer as the surviving
corporation in the Merger and becoming a wholly owned subsidiary of Grantee; and

          B.  As a condition and inducement to Grantee's willingness to enter
into the Merger Agreement, Grantee has requested that Issuer agree, and Issuer
has agreed, to grant Grantee the Option (as defined below).


          NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein, Issuer
and Grantee agree as follows:

          1.  Grant of Option.  Subject to the terms and conditions set forth
              ----------------
herein, Issuer hereby grants to Grantee an irrevocable option (the "Option") to
purchase up to 11,407,457 (as adjusted as set forth herein) shares (the "Option
Shares") of Common Stock, par value $0.001 per share ("Issuer Common Stock"), of
Issuer at a purchase price of $53.91 (as adjusted as set forth herein) per
Option Share (the "Purchase Price").

          2.  Exercise of Option.  (a)  Grantee may exercise the Option, with
              -------------------
respect to any or all of the Option Shares at any time or times, subject to the
provisions of Section 2(c), after the occurrence of any event as a result of
which Grantee is unconditionally entitled to receive the Termination Fee
pursuant to Section 5.09(b) of the Merger Agreement (a "Purchase Event");
provided, however, that (i) except as provided in the last sentence of this
--------  -------
Section 2(a), the Option will terminate and be of no further force and effect
upon the earliest to occur of (A) the
<PAGE>

                                                                               2

Effective Time, (B) 15 months after the first occurrence of a Purchase Event,
and (C) termination of the Merger Agreement in accordance with its terms prior
to the occurrence of a Purchase Event, unless, in the case of clause (C),
Grantee has the right to receive a Termination Fee following such termination
upon the occurrence of certain events, in which case the Option will not
terminate until the later of (x) 15 business days following the time such
Termination Fee becomes unconditionally payable and (y) the expiration of the
period in which Grantee has such right to receive a Termination Fee, and (ii)
any purchase of Option Shares upon exercise of the Option will be subject to
compliance with the HSR Act and the obtaining or making of any consents,
approvals, orders, notifications, filings or authorizations, the failure of
which to have obtained or made would have the effect of making the issuance of
Option Shares to Grantee illegal (the "Regulatory Approvals"). Notwithstanding
the termination of the Option, Grantee will be entitled to purchase the Option
Shares if it has exercised the Option in accordance with the terms hereof prior
to the termination of the Option and such termination of the Option will not
affect any rights hereunder which by their terms do not terminate or expire
prior to or as of such date.

          (b)  In the event that Grantee is entitled to and wishes to exercise
the Option, it will send to Issuer a written notice (an "Exercise Notice"; the
date of which being herein referred to as the "Notice Date") to that effect
which Exercise Notice also specifies the number of Option Shares, if any,
Grantee wishes to purchase pursuant to this Section 2(b), the number of Option
Shares, if any, with respect to which Grantee wishes to exercise its Cash-Out
Right (as defined herein) pursuant to Section 6(c), the denominations of the
certificate or certificates evidencing the Option Shares which Grantee wishes to
purchase pursuant to this Section 2(b) and a date (an "Option Closing Date"),
subject to the following sentence, not earlier than seven business days nor
later than 20 business days from the Notice Date for the closing of such
purchase (an "Option Closing").  Any Option Closing will be at an agreed
location and time in New York, New York on the applicable Option Closing Date or
at such later date as may be necessary so as to comply with the first sentence
of Section 2(a).

          (c)  Notwithstanding anything to the contrary contained herein, any
exercise of the Option and purchase of Option Shares shall be subject to
compliance with applicable laws and regulations, which may prohibit the purchase
of all the Option Shares specified in the Exercise Notice without first
obtaining or making certain Regulatory Approvals.  In
<PAGE>

                                                                               3

such event, if the Option is otherwise exercisable and Grantee wishes to
exercise the Option, the Option may be exercised in accordance with Section 2(b)
and Grantee shall acquire the maximum number of Option Shares specified in the
Exercise Notice that Grantee is then permitted to acquire under the applicable
laws and regulations, and if Grantee thereafter obtains the Regulatory Approvals
to acquire the remaining balance of the Option Shares specified in the Exercise
Notice, then Grantee shall be entitled to acquire such remaining balance. Issuer
agrees to use its reasonable efforts to assist Grantee in seeking the Regulatory
Approvals.

          In the event (i) Grantee receives official notice that a Regulatory
Approval required for the purchase of any Option Shares will not be issued or
granted or (ii) such Regulatory Approval has not been issued or granted within
six months of the date of the Exercise Notice, Grantee shall have the right to
exercise its Cash-Out Right pursuant to Section 6(c) with respect to the Option
Shares for which such Regulatory Approval will not be issued or granted or has
not been issued or granted.

          3.  Payment and Delivery of Certificates.  (a)  At any Option Closing,
              -------------------------------------
Grantee will pay to Issuer in immediately available funds by wire transfer to a
bank account designated in writing by Issuer an amount equal to the Purchase
Price multiplied by the number of Option Shares to be purchased at such Option
Closing plus the amount of any transfer, stamp or other similar taxes or charges
imposed in connection therewith.

          (b)  At any Option Closing, simultaneously with the delivery of
immediately available funds as provided in Section 3(a), Issuer will deliver to
Grantee a certificate or certificates representing the Option Shares to be
purchased at such Option Closing, which Option Shares will be free and clear of
all liens, claims, charges and encumbrances of any kind whatsoever.  If at the
time of issuance of Option Shares pursuant to an exercise of the Option
hereunder, Issuer shall have issued any securities similar to rights under a
stockholder rights plan, then each Option Share issued pursuant to such exercise
will also represent such a corresponding right with terms substantially the same
as and at least as favorable to Grantee as are provided under any such
stockholder rights plan then in effect.
<PAGE>

                                                                               4

          (c)  Certificates for the Option Shares delivered at an Option Closing
will have typed or printed thereon a restrictive legend which will read
substantially as follows:

     "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
     UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY BE REOFFERED OR SOLD
     ONLY IF SO REGISTERED OR IF AN EXEMPTION FROM SUCH REGISTRATION IS
     AVAILABLE.  SUCH SECURITIES ARE ALSO SUBJECT TO ADDITIONAL RESTRICTIONS ON
     TRANSFER AS SET FORTH IN THE STOCK OPTION AGREEMENT DATED AS OF AUGUST 9,
     1999, A COPY OF WHICH MAY BE OBTAINED FROM THE SECRETARY OF INTERNATIONAL
     NETWORK SERVICES AT ITS PRINCIPAL EXECUTIVE OFFICES."

It is understood and agreed that (i) the reference to restrictions arising under
the Securities Act in the above legend will be removed by delivery of substitute
certificate(s) without such reference if such Option Shares have been registered
pursuant to the Securities Act, such Option Shares have been sold in reliance on
and in accordance with Rule 144 under the Securities Act or Grantee has
delivered to Issuer a copy of a letter from the staff of the SEC, or an opinion
of counsel in form and substance reasonably satisfactory to Issuer and its
counsel, to the effect that such legend is not required for purposes of the
Securities Act and (ii) the reference to restrictions pursuant to this Agreement
in the above legend will be removed by delivery of substitute certificate(s)
without such reference if the Option Shares evidenced by certificate(s)
containing such reference have been sold or transferred in compliance with the
provisions of this Agreement under circumstances that do not require the
retention of such reference.

          4.  Representations and Warranties of Issuer. Issuer hereby represents
              -----------------------------------------
and warrants to Grantee as follows:

          Authorized Stock.  Issuer has taken all necessary corporate and other
          -----------------
     action to authorize and reserve and, subject to the expiration or
     termination of any required waiting period under the HSR Act, to permit it
     to issue, and, at all times from the date hereof until the obligation to
     deliver Option Shares upon the exercise of the Option terminates, shall
     have reserved for issuance, upon exercise of the Option, shares of Issuer
     Common Stock necessary for Grantee to exercise the Option, and Issuer will
     take all necessary corporate action to authorize and reserve for issuance
     all additional shares of Issuer Common Stock or other securities which may
     be issued pursuant to Section 6
<PAGE>

                                                                               5

     upon exercise of the Option. The shares of Issuer Common Stock to be issued
     upon due exercise of the Option, including all additional shares of Issuer
     Common Stock or other securities which may be issuable upon exercise of the
     Option or any other securities which may be issued pursuant to Section 6,
     upon issuance pursuant hereto, will be duly and validly issued, fully paid
     and nonassessable, and will be delivered free and clear of all liens,
     claims, charges and encumbrances of any kind or nature whatsoever,
     including without limitation any preemptive rights of any stockholder of
     Issuer.

          5.  Representations and Warranties of Grantee. Grantee hereby
              ------------------------------------------
represents and warrants to Issuer that:

          Purchase Not for Distribution.  Any Option Shares or other securities
          ------------------------------
     acquired by Grantee upon exercise of the Option will not be transferred or
     otherwise disposed of except in a transaction registered, or exempt from
     registration, under the Securities Act.

          6.  Adjustment upon Changes in Capitalization, Etc.  (a)  In the event
              -----------------------------------------------
of any change in Issuer Common Stock by reason of a stock dividend, split-up,
merger, recapitalization, combination, exchange of shares, or similar
transaction, the type and number of shares or securities subject to the Option,
and the Purchase Price thereof, will be adjusted appropriately, and proper
provision will be made in the agreements governing such transaction, so that
Grantee will receive upon exercise of the Option the number and class of shares
or other securities or property that Grantee would have received in respect of
Issuer Common Stock if the Option had been exercised immediately prior to such
event or the record date therefor, as applicable. Without limiting the parties'
relative rights and obligations under the Merger Agreement, if the number of
outstanding shares of Issuer Common Stock increases or decreases after the date
of this Agreement (other than pursuant to an event described in the first
sentence of this Section 6(a)), the number of shares of Issuer Common Stock
subject to the Option will be adjusted so that it equals 19.9% of the number of
shares of Issuer Common Stock then issued and outstanding, without giving effect
to any shares subject to or issued pursuant to the Option.

          (b)  Without limiting the parties' relative rights and obligations
under the Merger Agreement, in the event that Issuer enters into an agreement
(i) to consolidate with or merge into any person, other than Grantee or one of
its subsidiaries, and Issuer will not be the continuing or
<PAGE>

                                                                               6

surviving corporation in such consolidation or merger, (ii) to permit any
person, other than Grantee or one of its subsidiaries, to merge into Issuer and
Issuer will be the continuing or surviving corporation, but in connection with
such merger, the shares of Issuer Common Stock outstanding immediately prior to
the consummation of such merger will be changed into or exchanged for stock or
other securities of Issuer or any other person or cash or any other property, or
the shares of Issuer Common Stock outstanding immediately prior to the
consummation of such merger will, after such merger, represent less than 50% of
the outstanding voting securities of the merged company, or (iii) to sell or
otherwise transfer all or substantially all of its assets to any person, other
than Grantee or one of its subsidiaries, then, and in each such case, the
agreement governing such transaction will make proper provision so that the
Option will, upon the consummation of any such transaction and upon the terms
and conditions set forth herein, be converted into, or exchanged for, an option
with identical terms appropriately adjusted to acquire the number and class of
shares or other securities or property that Grantee would have received in
respect of Issuer Common Stock if the Option had been exercised immediately
prior to such consolidation, merger, sale, or transfer, or the record date
therefor, as applicable and make any other necessary adjustments.

          (c)  If, at any time during the period commencing on a Purchase Event
and ending on the termination of the Option in accordance with Section 2,
Grantee sends to Issuer an Exercise Notice indicating Grantee's election to
exercise its right (the "Cash-Out Right") pursuant to this Section 6(c), then
Issuer shall pay to Grantee, on the Option Closing Date, in exchange for the
cancelation of the Option with respect to such number of Option Shares as
Grantee specifies in the Exercise Notice, an amount in cash equal to such number
of Option Shares multiplied by the difference between (i) the average closing
price, for the 10 trading days commencing on the 12th trading day immediately
preceding the Option Closing Date, per share of Issuer Common Stock as reported
on The Nasdaq National Market (or, if not listed on The Nasdaq National Market,
as reported on any other national securities exchange or national securities
quotation system on which the Issuer Common Stock is listed or quoted, as
reported in The Wall Street Journal (Northeast edition), or, if not reported
            -----------------------
thereby, any other authoritative source) (the "Closing Price") and (ii) the
Purchase Price.  Notwithstanding the termination of the Option, Grantee will be
entitled to exercise its rights under this Section 6(c) if it has
<PAGE>

                                                                               7

exercised such rights in accordance with the terms hereof prior to the
termination of the Option.

          (d)  (i) Notwithstanding any other provision of this Agreement, in no
event shall Grantee's Total Profit (as hereinafter defined) plus any Termination
Fee paid to Grantee pursuant to Section 5.09(b) of the Merger Agreement exceed
in the aggregate $150 million and, if the total amount that otherwise would be
received by Grantee would exceed such amount, Grantee, at its election, shall
either (a) reduce the number of shares of Issuer Common Stock subject to the
Option, (b) deliver to Issuer for cancelation shares of Issuer Common Stock
previously purchased by Grantee, (c) pay cash to Issuer or (d) take any action
representing any combination of the preceding clauses (a), (b) and (c), so that
Grantee's actually realized Total Profit, when aggregated with such Termination
Fee so paid to Grantee, shall not exceed $150 million after taking into account
the foregoing actions.

     (ii)  Notwithstanding any other provision of this Agreement, the Option may
not be exercised for a number of Option Shares as would, as of the date of
exercise, result in a Notional Total Profit (as defined below) which, together
with any Termination Fee theretofore paid to Grantee, would exceed $150 million;
provided, that nothing in this sentence shall restrict any exercise of the
--------
Option permitted hereby on any subsequent date.

     (iii)  As used herein, the term "Total Profit" shall mean the aggregate
amount (before taxes) of the following: (A) the amount received by Grantee
pursuant to Issuer's repurchase of the Option (or any portion thereof) pursuant
to the exercise of the Cash-Out Right under Section 6(c) and (B)(x) the net cash
amounts or the fair market value of any property received by Grantee pursuant to
the sale of Option Shares (or other securities).

     (iv)  As used herein, the term "Notional Total Profit" with respect to any
number of Option Shares as to which Grantee may propose to exercise the Option
shall be the Total Profit determined as of the date of such proposal assuming
for such purpose that the Option was exercised on such date for such number of
Option Shares and assuming that such Option Shares, together with all other
Option Shares held by Grantee and its affiliates as of such date, were sold for
cash at the closing market price on The Nasdaq National Market (or, if shares of
Issuer Common Stock are not then listed or traded on The Nasdaq National Market,
on any other national securities exchange or national quotation system on which
shares of Issuer Common Stock are so listed
<PAGE>

                                                                               8

or traded) for shares of Issuer Common Stock as of the close of business on the
preceding trading day (less customary brokerage commissions).

          7.  Registration Rights.  (a) Issuer will, if requested by Grantee in
              --------------------
writing at any time and from time to time within two years of the exercise of
the Option, as expeditiously as possible prepare and file up to three
registration statements under the Securities Act if such registration is
necessary in order to permit the sale or other disposition of any or all shares
of securities that have been acquired by or are issuable to Grantee upon
exercise of the Option in accordance with the intended method of sale or other
disposition stated by Grantee, including a "shelf" registration statement under
Rule 415 under the Securities Act or any successor provision, and Issuer will
use its best efforts to qualify such shares or other securities under any
applicable state securities laws. Grantee agrees to cause, and to cause any
underwriters of any sale or other disposition to cause, any sale or other
disposition pursuant to such registration statement to be effected on a widely
distributed basis so that upon consummation thereof no purchaser or transferee
will own beneficially more than 5.0% of the then-outstanding voting power of
Issuer.  Issuer will use reasonable efforts to cause each such registration
statement to become effective, to obtain all consents or waivers of other
parties which are required therefor, and to keep such registration statement
effective for such period not in excess of 120 calendar days from the day such
registration statement first becomes effective as may be reasonably necessary to
effect such sale or other disposition.  The obligations of Issuer hereunder to
file a registration statement and to maintain its effectiveness may be suspended
for up to 120 calendar days in the aggregate if the Board of Directors of Issuer
shall have determined that the filing of such registration statement or the
maintenance of its effectiveness would require premature disclosure of material
nonpublic information that would materially and adversely affect Issuer or
otherwise interfere with or adversely affect any pending or proposed offering of
securities of Issuer or any other material transaction involving Issuer.  Any
registration statement prepared and filed under this Section 7, and any sale
covered thereby, will be at Issuer's expense except for underwriting discounts
or commissions, brokers' fees and the fees and disbursements of Grantee's
counsel related thereto.  Grantee will provide all information reasonably
requested by Issuer for inclusion in any registration statement to be filed
hereunder.  If, during the time periods referred to in the first sentence of
this Section 7, Issuer effects a registration under the
<PAGE>

                                                                               9

Securities Act of Issuer Common Stock for its own account or for any other
stockholders of Issuer (other than on Form S-4 or Form S-8, or any successor
form), it will allow Grantee the right to participate in such registration, and
such participation will not affect the obligation of Issuer to effect demand
registration statements for Grantee under this Section 7; provided that, if the
                                                          --------
managing underwriters of such offering advise Issuer in writing that in their
opinion the number of shares of Issuer Common Stock requested to be included in
such registration exceeds the number which can be sold in such offering, Issuer
will first reduce the shares requested to be included therein by Grantee before
reducing any other shares intended to be included therein by Issuer. In
connection with any registration pursuant to this Section 7, Issuer and Grantee
will provide each other and any underwriter of the offering with customary
representations, warranties, covenants, indemnification, and contribution in
connection with such registration.

          If a requested registration pursuant to this Section 7(a) involves an
underwritten offering, the underwriter or underwriters thereof shall be a
nationally recognized firm or firms selected by Issuer. Notwithstanding anything
else contained in this Section 7(a), each requested registration shall be for a
number of shares of Issuer Common Stock which represent at least one-fourth of
the total number of shares of Issuer Common Stock purchased by Grantee
hereunder.

          (b)  Notwithstanding Section 7(a), if Issuer receives a written
request (the "Registration Notice") from Grantee requesting that Issuer register
any or all shares of securities that have been acquired by Grantee upon exercise
of the Option (the "Registrable Securities"), Issuer will thereupon have the
option exercisable by written notice delivered to Grantee within ten business
days after receipt of the Registration Notice, to purchase all or any part of
the Registrable Securities for cash at a price (the "Option Price") equal to the
product of (i) the number of Registrable Securities so purchased and (ii) the
per share average of the closing sale prices of Issuer Common Stock on The
Nasdaq National Market (or any other national securities exchange or national
securities quotation system on which the shares of Issuer Common Stock are then
listed or quoted) for the twenty trading days immediately preceding the date of
the Registration Notice.  Any such purchase of Registrable Securities by Issuer
hereunder will take place at a closing to be held at the principal executive
offices of Issuer or its counsel at any reasonable date and time designated by
Issuer in such notice within ten business days after delivery of such notice.
The payment for the shares
<PAGE>

                                                                              10

to be purchased will be made by delivery at the time of such closing of the
Option Price in immediately available funds.

          8.  Transfers.  The Option Shares may not be sold, assigned,
              ----------
transferred, or otherwise disposed of except (i) in an underwritten public
offering as provided in Section 7 or (ii) to any purchaser or transferee who
would not, to the knowledge of Grantee after reasonable inquiry (which shall
include obtaining a representation from the purchaser or transferee),
immediately following such sale, assignment, transfer or disposal, beneficially
own more than 5.0% of the then-outstanding voting power of the Issuer; provided,
                                                                       --------
however, that Grantee shall be permitted to sell any Option Shares if such sale
-------
is made pursuant to a tender or exchange offer that has been approved or
recommended by a majority of the members of the Board of Directors of Issuer
(which majority shall include a majority of directors who were directors as of
the date hereof).

          9.  Quotation.  If Issuer Common Stock or any other securities to be
              ----------
acquired upon exercise of the Option are then quoted on The Nasdaq National
Market (or any other national securities exchange or national securities
quotation system), Issuer, upon the request of Grantee, will promptly file an
application to have the shares of Issuer Common Stock or other securities to be
acquired upon exercise of the Option quoted on The Nasdaq National Market (and
any such other national securities exchange or national securities quotation
system) and will use reasonable efforts to obtain approval of such quotation as
promptly as practicable.

          10.  Loss or Mutilation.  Upon receipt by Issuer of evidence
               -------------------
reasonably satisfactory to it of the loss, theft, destruction or mutilation of
this Agreement, and (in the case of loss, theft or destruction) of reasonably
satisfactory indemnification, and upon surrender and cancelation of this
Agreement, if mutilated, Issuer will execute and deliver a new Agreement of like
tenor and date. Any such new Agreement executed and delivered will constitute an
additional contractual obligation on the part of Issuer, whether or not the
Agreement so lost, stolen, destroyed, or mutilated shall at any time be
enforceable by anyone.

          11.  Miscellaneous.  (a)  Expenses.  Except as provided in Section 7,
               --------------       ---------
each of the parties hereto will bear and pay all costs and expenses incurred by
it or on its behalf in connection with the transactions contemplated hereunder,
including fees and expenses of its own financial consultants, investment
bankers, accountants, and counsel.
<PAGE>

                                                                              11

          (b)  Amendment.  This Agreement may not be amended, except by an
               ----------
instrument in writing signed on behalf of each of the parties.

          (c)  Extension; Waiver.  Any agreement on the part of a party to waive
               ------------------
any provision of this Agreement, or to extend the time for performance, will be
valid only if set forth in an instrument in writing signed on behalf of such
party.  The failure of any party to this Agreement to assert any of its rights
under this Agreement or otherwise will not constitute a waiver of such rights.

          (d)  Entire Agreement; No Third-Party Beneficiaries.  This Agreement,
               -----------------------------------------------
the Merger Agreement (including the documents and instruments attached thereto
as exhibits or schedules or delivered in connection therewith), the Stockholder
Agreement and the Confidentiality Agreement (i) constitute the entire agreement,
and supersede all prior agreements and understandings, both written and oral,
between the parties with respect to the subject matter of this Agreement, and
(ii) except as provided in Section 8.06 of the Merger Agreement, are not
intended to confer upon any person other than the parties any rights or
remedies.

          (e)  Governing Law.  This Agreement will be governed by, and construed
               --------------
in accordance with, the laws of the State of Delaware, regardless of the laws
that might otherwise govern under applicable principles of conflict of laws
thereof.

          (f)  Notices.  All notices, requests, claims, demands, and other
               --------
communications under this Agreement shall be sent in the manner and to the
addresses set forth in the Merger Agreement.

          (g)  Assignment.  Neither this Agreement, the Option nor any of the
               -----------
rights, interests, or obligations under this Agreement may be assigned or
delegated, in whole or in part, by operation of law or otherwise, by Issuer or
Grantee without the prior written consent of the other.  Any assignment or
delegation in violation of the preceding sentence will be void.  Subject to the
first and second sentences of this Section 11(g), this Agreement will be binding
upon, inure to the benefit of, and be enforceable by, the parties and their
respective successors and assigns.

          (h)  Further Assurances.  In the event of any exercise of the Option
               -------------------
by Grantee, Issuer and Grantee will execute and deliver all other documents and
instruments and take all other actions that may be reasonably necessary in
<PAGE>

                                                                              12

order to consummate the transactions provided for by such exercise.

          (i)  Enforcement.  The parties agree that irreparable damage would
               ------------
occur and that the parties would not have any adequate remedy at law in the
event that any of the provisions of this Agreement were not performed in
accordance with their specific terms or were otherwise breached.  It is
accordingly agreed that the parties will be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any Federal court located in the
State of Delaware or in Delaware state court, the foregoing being in addition to
any other remedy to which they are entitled at law or in equity.  In addition,
each of the parties hereto (i) consents to submit itself to the personal
jurisdiction of any Federal court located in the State of Delaware or any
Delaware state court in the event any dispute arises out of this Agreement or
any of the transactions contemplated by this Agreement, (ii) agrees that it will
not attempt to deny or defeat such personal jurisdiction by motion or other
request for leave from any such court, and (iii) agrees that it will not bring
any action relating to this Agreement or any of the transactions contemplated by
this Agreement in any court other than a Federal court sitting in the State of
Delaware or a Delaware state court.

          (j)  Severability.  If any term or other provision of this Agreement
               -------------
is invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect.  Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible to the fullest extent
permitted by applicable law in an acceptable manner to the end that the
transactions contemplated hereby are fulfilled to the extent possible.
<PAGE>

                                                                              13

          IN WITNESS WHEREOF, Issuer and Grantee have caused this Agreement to
be signed by their respective officers thereunto duly authorized as of the day
and year first written above.

                                INTERNATIONAL NETWORK SERVICES,

                                  by
                                    /s/ John L. Drew
                                    -------------------------
                                    Name:  John L. Drew
                                    Title: President and Chief
                                           Executive Officer


                                LUCENT TECHNOLOGIES INC.,

                                  by
                                    /s/ Patricia F. Russo
                                    -------------------------
                                    Name:  Patricia F. Russo
                                    Title: Executive Vice
                                           President, Strategy
                                           and Corporate
                                           Operations