CISCO SYSTEMS INC
S-8, 1999-12-21
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>   1

    As filed with the Securities and Exchange Commission December 21, 1999
                                                      Registration No. 333-_____

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                ---------------
                                    FORM S-8
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933

                                ---------------
                               CISCO SYSTEMS, INC.
             (Exact name of registrant as specified in its charter)


              CALIFORNIA                               77-0059951
     (State or other jurisdiction           (IRS Employer Identification No.)
   of incorporation or organization)


             170 WEST TASMAN DRIVE, SAN JOSE, CALIFORNIA 95134-1706
               (Address of principal executive offices) (Zip Code)

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

                  CALISTA, INC. 1999 EMPLOYEE STOCK OPTION PLAN

                            ------------------------
                            (Full title of the Plan)

                                ---------------
                                JOHN T. CHAMBERS
                 PRESIDENT, CHIEF EXECUTIVE OFFICER AND DIRECTOR
                               CISCO SYSTEMS, INC.
             170 WEST TASMAN DRIVE, SAN JOSE, CALIFORNIA 95134-1706
                     (Name and address of agent for service)
                                 (408) 526-4000
          (Telephone number, including area code, of agent for service)

                                ---------------
                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                       Proposed          Proposed
           Title of                                    Maximum           Maximum
          Securities                  Amount           Offering         Aggregate         Amount of
             to be                    to be             Price            Offering       Registration
          Registered              Registered(1)      per Share(2)        Price(2)            Fee
          ----------             --------------      ------------     -------------     ------------
<S>                              <C>                 <C>              <C>               <C>
Calista, Inc. 1999 Employee
Stock Option Plan                320,311 shares         $5.69         $1,822,569.59        $481.16

Common Stock (par value $0.01)
</TABLE>

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

(1)  This Registration Statement shall also cover any additional shares of
     Registrant's Common Stock which become issuable under the Calista, Inc.
     1999 Employee Stock Option Plan by reason of any stock dividend, stock
     split, recapitalization or other similar transaction effected without the
     Registrant's receipt of consideration which results in an increase in the
     number of the Registrant's outstanding shares of Common Stock.

(2)  Calculated solely for purposes of this offering under Rule 457(h) of the
     Securities Act of 1933, as amended, on the basis of the weighted average
     exercise price of the outstanding options.


<PAGE>   2


                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference

        Cisco Systems, Inc. (the "Registrant") hereby incorporates by reference
into this Registration Statement the following documents previously filed with
the Securities and Exchange Commission (the "Commission"):

        (a)  The Registrant's Annual Report on Form 10-K for the fiscal year
             ended July 31, 1999, filed with the Commission on September 28,
             1999, pursuant to Section 13 of the Securities Exchange Act of
             1934, as amended (the " 1934 Act");

        (b)  The Registrant's Quarterly Report on Form 10-Q for the fiscal
             quarter ended October 30, 1999, filed with the Commission on
             December 14, 1999.


        (c)  The Registrant's Current Reports on Form 8-K filed with the
             Commission on August 13, 1999, as amended on Form 8-K/A filed with
             the Commission on August 13, 1999, August 26, 1999, September 27,
             1999, October 20, 1999, November 4, 1999, November 17, 1999 and
             December 15, 1999;

        (d)  The Registrant's Registration Statement No. 000-18225 on Form 8-A
             filed with the Commission on January 11, 1990, together with
             Amendment No. 1 on Form 8-A/A filed with the Commission on February
             15, 1990, and including any other amendments or reports filed for
             the purpose of updating such description, in which there is
             described the terms, rights and provisions applicable to the
             Registrant's Common Stock, and;

        (e)  The Registrant's Registration Statement No. 000-18225 on Form 8-A
             filed with the Commission on June 11, 1998, including any
             amendments or reports filed for the purpose of updating such
             description, in which there is described the terms, rights and
             provisions applicable to the Registrant's Preferred Stock Purchase
             Rights.

        All reports and definitive proxy or information statements filed
pursuant to Section 13(a), 13(c), 14 or 15(d) of the 1934 Act after the date of
this Registration Statement and prior to the filing of a post-effective
amendment which indicates that all securities offered hereby have been sold or
which de-registers all securities then remaining unsold shall be deemed to be
incorporated by reference into this Registration Statement and to be a part
hereof from the date of filing of such documents. Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for purposes of this Registration Statement
to the extent that a statement contained herein or in any subsequently filed
document which also is deemed to be incorporated by reference herein modifies or
supersedes such statement. Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Registration Statement.

Item 4. Description of Securities

        Not Applicable.

Item 5. Interests of Named Experts and Counsel

        Not Applicable.

Item 6. Indemnification of Directors and Officers

        Section 317 of the California Corporations Code authorizes a court to
award, or a corporation's Board of Directors to grant indemnity to directors and
officers in terms sufficiently broad to permit indemnification (including
reimbursement of expenses incurred) under certain circumstances for liabilities
arising under the Securities Act of 1933, as amended, (the "1933 Act"). The
Registrant's Restated Articles of Incorporation, as amended, and Amended and
Restated Bylaws provide for indemnification of its directors, officers,
employees and other agents to the maximum extent permitted by the California
Corporations Code. In addition, the Registrant has entered into Indemnification
Agreements with each of its directors and officers.


                                      II-1
<PAGE>   3

Item 7. Exemption from Registration Claimed

        Not Applicable.

Item 8. Exhibits

<TABLE>
<CAPTION>
Exhibit Number        Exhibit
- --------------        -------
<S>                   <C>
   4                  Instruments Defining the Rights of Stockholders. Reference
                      is made to Registrant's Registration Statements No.
                      000-18225 on Form 8-A, together with the amendments and
                      exhibits thereto, which are incorporated herein by
                      reference pursuant to Items 3(d) and 3(e).
   5                  Opinion and consent of Brobeck, Phleger & Harrison LLP.
  23.1                Consent of PricewaterhouseCoopers LLP, Independent Accountants.
  23.2                Consent of Brobeck, Phleger & Harrison LLP is contained in Exhibit 5.
  24                  Power of Attorney.  Reference is made to page II-3 of this Registration Statement.
  99.1                Calista, Inc. 1999 Employee Stock Option Plan.
  99.2                Calista, Inc. - Form of Stock Option Award Agreement.
  99.3                Form of Option Assumption Agreement.
  99.4                Form of Option Assumption Agreement - Acceleration.
</TABLE>

Item 9. Undertakings

        A. The undersigned Registrant hereby undertakes: (1) to file, during any
period in which offers or sales are being made, a post-effective amendment to
this Registration Statement: (i) to include any prospectus required by Section
10(a)(3) of the 1933 Act, (ii) to reflect in the prospectus any facts or events
arising after the effective date of this Registration Statement (or the most
recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in this
Registration Statement and (iii) to include any material information with
respect to the plan of distribution not previously disclosed in this
Registration Statement or any material change to such information in this
Registration Statement; provided, however, that clauses (1)(i) and (1)(ii) shall
not apply if the information required to be included in a post-effective
amendment by those clauses is contained in periodic reports filed by the
Registrant pursuant to Section 13 or Section 15(d) of the 1934 Act that are
incorporated by reference into this Registration Statement; (2) that for the
purpose of determining any liability under the 1933 Act each such post-effective
amendment shall be deemed to be a new registration statement relating to the
securities offered therein and the offering of such securities at that time
shall be deemed to be the initial bona fide offering thereof; and (3) to remove
from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the Calista, Inc.
1999 Employee Stock Option Plan.

        B. The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the 1933 Act, each filing of the Registrant's
annual report pursuant to Section 13(a) or Section 15(d) of the 1934 Act that is
incorporated by reference into this Registration Statement shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

        C. Insofar as indemnification for liabilities arising under the 1933 Act
may be permitted to directors, officers or controlling persons of the Registrant
pursuant to the indemnification provisions summarized in Item 6 or otherwise,
the Registrant has been advised that, in the opinion of the Commission, such
indemnification is against public policy as expressed in the 1933 Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the Registrant of expenses incurred
or paid by a director, officer, or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the 1933 Act and will be governed by the final
adjudication of such issue.

                                      II-2
<PAGE>   4

                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8, and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of San Jose, State of California on this 21st day
of December, 1999.

                                            CISCO SYSTEMS, INC.

                                            By: /s/John T. Chambers
                                               ---------------------------------
                                               John T. Chambers
                                               President, Chief Executive
                                                 Officer and Director


                                POWER OF ATTORNEY

        KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints John T. Chambers and Larry R. Carter, and
each of them, as such person's true and lawful attorneys-in-fact and agents,
with full power of substitution and resubstitution, for such person and in such
person's name, place and stead, in any and all capacities, to sign any and all
amendments (including post-effective amendments) to this Registration Statement,
and to file same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
connection therewith, as fully to all intents and purposes as such person might
or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their or his or her
substitutes, may lawfully do or cause to be done by virtue thereof.

        Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons on
behalf of the Registrant and in the capacities and on the dates indicated:

<TABLE>
<CAPTION>
Signature                              Title                                           Date
- ---------                              -----                                           ----
<S>                                    <C>                                      <C>
/s/John T. Chambers                    President, Chief Executive               December 21, 1999
- ---------------------------------      Officer and Director
John T. Chambers                       (Principal Executive Officer)


/s/Larry R. Carter                     Senior Vice President, Finance           December 21, 1999
- ---------------------------------      and Administration, Chief Financial
Larry R. Carter                        Officer and Secretary
                                       (Principal Financial and Accounting
                                       Officer)


/s/John P. Morgridge                   Chairman of the Board and                December 21, 1999
- ---------------------------------      Director
John P. Morgridge
</TABLE>


                                      II-3
<PAGE>   5

<TABLE>
<S>                                    <C>                                      <C>
/s/Donald T. Valentine                 Vice Chairman of the Board and           December 21, 1999
- ---------------------------------      Director
Donald T. Valentine


/s/James F. Gibbons                    Director                                 December 21, 1999
- ---------------------------------
James F. Gibbons


/s/Steven M. West                      Director                                 December 21, 1999
- ---------------------------------
Steven M. West


/s/Edward R. Kozel                     Director                                 December 21, 1999
- ---------------------------------
Edward R. Kozel


/s/ Carol A. Bartz                     Director                                 December 21, 1999
- ---------------------------------
Carol A. Bartz


/s/James C. Morgan                     Director                                 December 21, 1999
- ---------------------------------
James C. Morgan


/s/Mary Cirillo                        Director                                 December 21, 1999
- ---------------------------------
Mary Cirillo


/s/Arun Sarin                          Director                                 December 21, 1999
- ---------------------------------
Arun Sarin
</TABLE>

                                      II-4
<PAGE>   6

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>
Exhibit Number        Exhibit
- --------------        -------
<S>                   <C>
   4                  Instruments Defining the Rights of Stockholders. Reference
                      is made to Registrant's Registration Statements No.
                      000-18225 on Form 8-A, together with the amendments and
                      exhibits thereto, which are incorporated herein by
                      reference pursuant to Items 3(d) and 3(e).
   5                  Opinion and consent of Brobeck, Phleger & Harrison LLP.
  23.1                Consent of PricewaterhouseCoopers LLP, Independent Accountants.
  23.2                Consent of Brobeck, Phleger & Harrison LLP is contained in Exhibit 5.
  24                  Power of Attorney.  Reference is made to page II-3 of this Registration Statement.
  99.1                Calista, Inc. 1999 Employee Stock Option Plan.
  99.2                Calista, Inc. - Form of Stock Option Award Agreement.
  99.3                Form of Option Assumption Agreement.
  99.4                Form of Option Assumption Agreement - Acceleration.
</TABLE>

<PAGE>   1

                                                                       EXHIBIT 5

             OPINION AND CONSENT OF BROBECK, PHLEGER & HARRISON LLP

                                December 21, 1999

Cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

        Re:  Cisco Systems, Inc. - Registration Statement for Offering of an
             Aggregate of 320,311 Shares of Common Stock

Dear Ladies and Gentlemen:

        We have acted as counsel to Cisco Systems, Inc., a California
corporation (the "Company"), in connection with the registration on Form S-8
(the "Registration Statement") under the Securities Act of 1933, as amended, of
an aggregate of 320,311 shares of common stock (the "Shares") and related stock
options under the Calista, Inc. 1999 Employee Stock Option Plan (the "Plan").
This opinion is being furnished in accordance with the requirements of Item 8 of
Form S-8 and Item 601(b)(5)(i) of Regulation S-K.

        We have reviewed the Company's charter documents and the corporate
proceedings taken by the Company in connection with the assumption of the Plan
and the options outstanding thereunder. Based on such review, we are of the
opinion that if, as and when the Shares are issued and sold (and the
consideration therefor received) pursuant to the provisions of option agreements
duly authorized under the Plan and in accordance with the Registration
Statement, such Shares will be duly authorized, legally issued, fully paid and
nonassessable.

        We consent to the filing of this opinion letter as Exhibit 5 to the
Registration Statement.

        This opinion letter is rendered as of the date first written above and
we disclaim any obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinion expressed herein. Our opinion is expressly
limited to the matters set forth above and we render no opinion, whether by
implication or otherwise, as to any other matters relating to the Company, the
Plan or the Shares.


                                            Very truly yours,

                                            /S/ BROBECK, PHLEGER & HARRISON LLP

                                            BROBECK, PHLEGER & HARRISON LLP


<PAGE>   1

                                                                    EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the incorporation by reference in this Registration
Statement on Form S-8 of our report dated August 10, 1999 relating to the
consolidated financial statements, which appears in the 1999 Annual Report to
Shareholders of Cisco Systems, Inc., which is incorporated by reference in Cisco
Systems, Inc.'s Annual Report on Form 10-K for the year ended July 31, 1999. We
also consent to the incorporation by reference of our report dated August 10,
1999 relating to the financial statement schedule, which appears in such Annual
Report on Form 10-K. We also consent to the incorporation by reference of our
report dated August 10, 1999, except as to the pooling of interests transactions
as described in Note 3b which is as of November 24, 1999, relating to the
supplementary consolidated financial statements of Cisco Systems, Inc. which
appears in the Current Report on Form 8-K dated December 15, 1999.


                                            /s/ PricewaterhouseCoopers LLP
                                            ------------------------------
                                            PricewaterhouseCoopers LLP



San Jose, California
December 17, 1999

<PAGE>   1

                                                                    EXHIBIT 99.1

                      CALISTA, INC., A DELAWARE CORPORATION

                         1999 EMPLOYEE STOCK OPTION PLAN

        1. Purposes of the Plan. The purposes of this Stock Option Plan are to
attract and retain the best available personnel, to provide additional incentive
to Employees, Directors and Consultants and to promote the success of the
Company's business.

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

                (a) "Administrator" means the Board or any of the Committees
appointed to administer the Plan.

                (b) "Applicable Laws" means the legal requirements relating to
the administration of stock incentive plans, if any, under applicable provisions
of federal and state securities laws, the corporate laws of California and, to
the extent other than California, the corporate law of the state of the
Company's incorporation, the Code, the rules of any applicable stock exchange or
national market system, and the rules of any foreign jurisdiction applicable to
Awards granted to residents therein.

                (c) "Award" means the grant of an Option, Restricted Stock, or
other right or benefit under the Plan.

                (d) "Award Agreement" means the written agreement evidencing the
grant of an Award executed by the Company and the Grantee, including any
amendments thereto.

                (e) "Board" means the Board of Directors of the Company.

                (f) "Code" means the Internal Revenue Code of 1986, as amended.

                (g) "Committee" means any committee appointed by the Board to
administer the Plan.

                (h) "Common Stock" means the common stock of the Company

                (i) "Company" means Calista, Inc., a Delaware corporation.

                (j) "Consultant" means any person (other than an Employee or a
Director, solely with respect to rendering services in such person's capacity as
a Director) who is engaged by the Company or any Related Entity to render
consulting or advisory services to the Company or such Related Entity.

                (k) "Continuous Service" means that the provision of services to
the Company or a Related Entity in any capacity of Employee, Director or
Consultant, is not interrupted or terminated. Continuous Service shall not be
considered interrupted in the case of (i) any approved leave of absence, (ii)
transfers among the Company, any Related Entity, or any successor, in any
capacity of Employee, Director or Consultant, or (iii) any change in status as


                                       1
<PAGE>   2

long as the individual remains in the service of the Company or a Related Entity
in any capacity of Employee, Director or Consultant (except as otherwise
provided in the Award Agreement). An approved leave of absence shall include
sick leave, military leave, or any other authorized personal leave. For purposes
of Incentive Stock Options, no such leave may exceed ninety (90) days, unless
reemployment upon expiration of such leave is guaranteed by statute or contract.

        (l) "Corporate Transaction" means any of the following transactions to
which the Company is a party, but excluding any such transaction that the
Administrator determines shall not be a Corporate Transaction:

                (i) a merger or consolidation in which the Company is not the
surviving entity, except for a transaction the principal purpose of which is to
change the state in which the Company is incorporated;

                (ii) the sale, transfer or other disposition of all or
substantially all of the assets of the Company (including the capital stock of
the Company's subsidiary corporations) in connection with the complete
liquidation or dissolution of the Company;

                (iii) any reverse merger in which the Company is the surviving
entity but in which securities possessing more than fifty percent (50%) of the
total combined voting power of the Company's outstanding securities are
transferred to a person or persons different from those who held such securities
immediately prior to such merger; or

                (iv) acquisition by any person or related group of persons
(other than the Company or by a Company-sponsored employee benefit plan) of
beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) of
securities possessing more than fifty percent (50%) of the total combined voting
power of the Company's outstanding securities.

        (m) "Director" means a member of the Board or the board of directors of
any Related Entity.

        (n) "Disability" means that a Grantee is permanently unable to carry out
the responsibilities and functions of the position held by the Grantee by reason
of any medically determinable physical or mental impairment. A Grantee will not
be considered to have incurred a Disability unless he or she furnishes proof of
such impairment sufficient to satisfy the Administrator in its discretion.

        (o) "Employee" means any person, including an Officer or Director, who
is an employee of the Company or any Related Entity. The payment of a director's
fee by the Company or a Related Entity shall not be sufficient to constitute
"employment" by the Company.

        (p) "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

        (q) "Fair Market Value" means, as of any date, the value of Common Stock
determined as follows:


                                       2
<PAGE>   3

                (i) Where there exists a public market for the Common Stock, the
Fair Market Value shall be (A) the closing price for a Share for the last market
trading day prior to the time of the determination (or, if no closing price was
reported on that date, on the last trading date on which a closing price was
reported) on the stock exchange determined by the Administrator to be the
primary market for the Common Stock or the Nasdaq National Market, whichever is
applicable or (B) if the Common Stock is not traded on any such exchange or
national market system, the average of the closing bid and asked prices of a
Share on the Nasdaq Small Cap Market for the day prior to the time of the
determination (or, if no such prices were reported on that date, on the last
date on which such prices were reported), in each case, as reported in The Wall
Street Journal or such other source as the Administrator deems reliable; or

                (ii) In the absence of an established market for the Common
Stock of the type described in (i), above, the Fair Market Value thereof shall
be determined by the Administrator in good faith and in a manner consistent with
Section 260.140.50 of Title 10 of the California Code of Regulations.

        (r) "Grantee" means an Employee, Director or Consultant who receives an
Award under the Plan.

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

        (t) "Non-Qualified Stock Option" means an Option not intended to qualify
as an Incentive Stock Option.

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

        (v) "Option" means an option to purchase Shares pursuant to an Award
Agreement granted under the Plan.

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

        (x) "Plan" means this 1999 Employee Stock Option Plan.

        (y) "Post-Termination Exercise Period" means the period specified in the
Award Agreement of not less than thirty (30) days commencing on the date of
termination of the Grantee's Continuous Service, or such longer period as may be
applicable upon death or Disability.

        (z) "Registration Date" means the first to occur of (i) the closing of
the first sale to the general public of (A) the Common Stock or (B) the same
class of securities of a successor corporation (or its Parent) issued pursuant
to a Corporate Transaction in exchange for or in substitution of the Common
Stock, pursuant to a registration statement filed with and


                                       3
<PAGE>   4

declared effective by the Securities and Exchange Commission under the
Securities Act of 1933, as amended; and (ii) in the event of a Corporate
Transaction, the date of the consummation of the Corporate Transaction if the
same class of securities of the successor corporation (or its Parent) issuable
in such Corporate Transaction shall have been sold to the general public
pursuant to a registration statement filed with and declared effective by the
Securities and Exchange Commission under the Securities Act of 1933, as amended,
on or prior to the date of consummation of such Corporate Transaction, .

                (aa) "Related Entity" means any Parent, Subsidiary and any
business, corporation, partnership, limited liability company or other entity in
which the Company, a Parent or a Subsidiary holds a substantial ownership
interest, directly or indirectly.

                (bb) "Restricted Stock" means Shares issued under the Plan to
the Grantee for such consideration, if any, and subject to such restrictions on
transfer, rights of first refusal, repurchase provisions, forfeiture provisions,
and other terms and conditions as established by the Administrator.

                (cc) "Share" means a share of the Common Stock.

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

        3. Stock Subject to the Plan.

                (a) Subject to the provisions of Section 11(a) below, the
maximum aggregate number of Shares which may be issued pursuant to all Awards
(including Incentive Stock Options) is six million four hundred thousand
(6,400,000) Shares. The Shares may be authorized, but unissued, or reacquired
Common Stock.

                (b) Any Shares covered by an Award (or portion of an Award)
which is forfeited or canceled, expires or is settled in cash, shall be deemed
not to have been issued for purposes of determining the maximum aggregate number
of Shares which may be issued under the Plan. If any unissued Shares are
retained by the Company upon exercise of an Award in order to satisfy the
exercise price for such Award or any withholding taxes due with respect to such
Award, such retained Shares subject to such Award shall become available for
future issuance under the Plan (unless the Plan has terminated). Shares that
actually have been issued under the Plan pursuant to an Award shall not be
returned to the Plan and shall not become available for future issuance under
the Plan, except that if unvested Shares are forfeited, or repurchased by the
Company at their original purchase price, such Shares shall become available for
future grant under the Plan.

        4. Administration of the Plan.

                (a) Plan Administrator. With respect to grants of Awards to
Employees, Directors, or Consultants, the Plan shall be administered by (A) the
Board or (B) a Committee (or a subcommittee of the Committee) designated by the
Board, which Committee shall be


                                       4
<PAGE>   5

constituted in such a manner as to satisfy Applicable Laws. Once appointed, such
Committee shall continue to serve in its designated capacity until otherwise
directed by the Board.

                (b) Powers of the Administrator. Subject to Applicable Laws and
the provisions of the Plan (including any other powers given to the
Administrator hereunder), and except as otherwise provided by the Board, the
Administrator shall have the authority, in its discretion:

                        (i) to select the Employees, Directors and Consultants
to whom Awards may be granted from time to time hereunder;

                        (ii) to determine whether and to what extent Awards are
granted hereunder;

                        (iii) to determine the number of Shares or the amount of
other consideration to be covered by each Award granted hereunder;

                        (iv) to approve forms of Award Agreements for use under
the Plan;

                        (v) to determine the terms and conditions of any Award
granted hereunder;

                        (vi) to establish additional terms, conditions, rules or
procedures to accommodate the rules or laws of applicable foreign jurisdictions
and to afford Grantees favorable treatment under such rules or laws; provided,
however, that no Award shall be granted under any such additional terms,
conditions, rules or procedures with terms or conditions which are inconsistent
with the provisions of the Plan;

                        (vii) to amend the terms of any outstanding Award
granted under the Plan, provided that any amendment that would adversely affect
the Grantee's rights under an outstanding Award shall not be made without the
Grantee's written consent;

                        (viii) to construe and interpret the terms of the Plan
and Awards, including without limitation, any notice of award or Award
Agreement, granted pursuant to the Plan; and

                        (ix) to take such other action, not inconsistent with
the terms of the Plan, as the Administrator deems appropriate.

        5. Eligibility. Awards other than Incentive Stock Options may be granted
to Employees, Directors and Consultants. Incentive Stock Options may be granted
only to Employees of the Company, a Parent or a Subsidiary. An Employee,
Director or Consultant who has been granted an Award may, if otherwise eligible,
be granted additional Awards. Awards may be granted to such Employees, Directors
or Consultants who are residing in foreign jurisdictions as the Administrator
may determine from time to time.


                                       5
<PAGE>   6

        6. Terms and Conditions of Awards.

                (a) Type of Awards. The Administrator is authorized under the
Plan to award any type of arrangement to an Employee, Director or Consultant
that is not inconsistent with the provisions of the Plan and that by its terms
involves or might involve the issuance of (i) Shares, (ii) an Option, or similar
right with a fixed or variable price related to the Fair Market Value of the
Shares and with an exercise or conversion privilege related to the passage of
time, the occurrence of one or more events, or the satisfaction of performance
criteria or other conditions, or (iii) any other security with the value derived
from the value of the Shares. Such awards include, without limitation, Options,
or sales or bonuses of Restricted Stock, and an Award may consist of one such
security or benefit, or two (2) or more of them in any combination or
alternative.

                (b) Designation of Award. Each Award shall be designated in the
Award Agreement. In the case of an Option, the Option shall be designated as
either an Incentive Stock Option or a Non-Qualified Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of Shares subject to Options designated as Incentive Stock Options which
become exercisable for the first time by a Grantee during any calendar year
(under all plans of the Company or any Parent or Subsidiary) exceeds $100,000,
such excess Options, to the extent of the Shares covered thereby in excess of
the foregoing limitation, shall be treated as Non-Qualified Stock Options. For
this purpose, Incentive Stock Options shall be taken into account in the order
in which they were granted, and the Fair Market Value of the Shares shall be
determined as of the grant date of the relevant Option.

                (c) Conditions of Award. Subject to the terms of the Plan, the
Administrator shall determine the provisions, terms, and conditions of each
Award including, but not limited to, the Award vesting schedule, repurchase
provisions, rights of first refusal, forfeiture provisions, form of payment
(cash, Shares, or other consideration) upon settlement of the Award, payment
contingencies, and satisfaction of any performance criteria. The performance
criteria established by the Administrator may be based on any one of, or
combination of, increase in share price, earnings per share, total shareholder
return, return on equity, return on assets, return on investment, net operating
income, cash flow, revenue, economic value added, personal management
objectives, or other measure of performance selected by the Administrator.
Partial achievement of the specified criteria may result in a payment or vesting
corresponding to the degree of achievement as specified in the Award Agreement.

                (d) Acquisitions and Other Transactions. The Administrator may
issue Awards under the Plan in settlement, assumption or substitution for,
outstanding awards or obligations to grant future awards in connection with the
Company or a Related Entity acquiring another entity, an interest in another
entity or an additional interest in a Related Entity whether by merger, stock
purchase, asset purchase or other form of transaction.

                (e) Deferral of Award Payment. The Administrator may establish
one or more programs under the Plan to permit selected Grantees the opportunity
to elect to defer receipt of consideration upon exercise of an Award,
satisfaction of performance criteria, or other


                                       6
<PAGE>   7

event that absent the election would entitle the Grantee to payment or receipt
of Shares or other consideration under an Award. The Administrator may establish
the election procedures, the timing of such elections, the mechanisms for
payments of, and accrual of interest or other earnings, if any, on amounts,
Shares or other consideration so deferred, and such other terms, conditions,
rules and procedures that the Administrator deems advisable for the
administration of any such deferral program.

                (f) Award Exchange Programs. The Administrator may establish one
or more programs under the Plan to permit selected Grantees to exchange an Award
under the Plan for one or more other types of Awards under the Plan on such
terms and conditions as determined by the Administrator from time to time.

                (g) Separate Programs. The Administrator may establish one or
more separate programs under the Plan for the purpose of issuing particular
forms of Awards to one or more classes of Grantees on such terms and conditions
as determined by the Administrator from time to time.

                (h) Early Exercise. The Award Agreement may, but need not,
include a provision whereby the Grantee may elect at any time while an Employee,
Director or Consultant to exercise any part or all of the Award prior to full
vesting of the Award. Any unvested Shares received pursuant to such exercise may
be subject to a repurchase right in favor of the Company or a Related Entity or
to any other restriction the Administrator determines to be appropriate.

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

                (j) Transferability of Awards. Non-Qualified Stock Options shall
be transferable (i) to the extent provided in the Award Agreement and in a
manner consistent with Section 260.140.41 of Title 10 of the California Code of
Regulations and (ii) by will, and by the laws of descent and distribution.
Incentive Stock Options and other Awards may not be sold, pledged, assigned,
hypothecated, transferred, or disposed of in any manner other than by will or by
the laws of descent or distribution and may be exercised, during the lifetime of
the Grantee, only by the Grantee.

                (k) Time of Granting Awards. The date of grant of an Award shall
for all purposes be the date on which the Administrator makes the determination
to grant such Award, or such other date as is determined by the Administrator.
Notice of the grant determination shall be given to each Employee, Director or
Consultant to whom an Award is so granted within a reasonable time after the
date of such grant.

                                       7
<PAGE>   8

        7. Award Exercise or Purchase Price, Consideration, Taxes and Reload
Options.

                (a) Exercise or Purchase Price. The exercise or purchase price,
if any, for an Award shall be as follows:

                        (i) In the case of an Incentive Stock Option:

                                (A) granted to an Employee who, at the time of
the grant of such Incentive Stock Option owns stock representing more than ten
percent (10%) of the voting power of all classes of stock of the Company or any
Parent or Subsidiary, the per Share exercise price shall be not less than one
hundred ten percent (110%) of the Fair Market Value per Share on the date of
grant; or

                                (B) granted to any Employee other than an
Employee described in the preceding paragraph, the per Share exercise price
shall be not less than one hundred percent (100%) of the Fair Market Value per
Share on the date of grant.

                        (ii) In the case of a Non-Qualified Stock Option:

                                (A) granted to a person who, at the time of the
grant of such Option, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary,
the per Share exercise price shall be not less than one hundred ten percent
(110%) of the Fair Market Value per Share on the date of grant; or

                                (B) granted to any person other than a person
described in the preceding paragraph, the per Share exercise price shall be not
less than eighty-five percent (85%) of the Fair Market Value per Share on the
date of grant.

                        (iii) In the case of the sale of Shares:

                                (A) granted to a person who, at the time of the
grant of such Award, or at the time the purchase is consummated, owns stock
representing more than ten percent (10%) of the voting power of all classes of
stock of the Company or any Parent or Subsidiary, the per Share purchase price
shall be not less than one hundred percent (100%) of the Fair Market Value per
Share on the date of grant; or

                                (B) granted to any person other than a person
described in the preceding paragraph, the per Share purchase price shall be not
less than eighty-five percent (85%) of the Fair Market Value per Share on the
date of grant.

                        (iv) In the case of other Awards, such price as is
determined by the Administrator.

                        (v) Notwithstanding the foregoing provisions of this
Section 7(a), in the case of an Award issued pursuant to Section 6(d), above,
the exercise or purchase price for the Award shall be determined in accordance
with the principles of Section 424(a) of the Code.


                                       8
<PAGE>   9

                (b) Consideration. Subject to Applicable Laws, the consideration
to be paid for the Shares to be issued upon exercise or purchase of an Award
including the method of payment, shall be determined by the Administrator (and,
in the case of an Incentive Stock Option, shall be determined at the time of
grant). In addition to any other types of consideration the Administrator may
determine, the Administrator is authorized to accept as consideration for Shares
issued under the Plan the following, provided that the portion of the
consideration equal to the par value of the Shares must be paid in cash or other
legal consideration permitted by the Delaware General Corporation Law:

                        (i) cash;

                        (ii) check;

                        (iii) delivery of Grantee's promissory note with such
recourse, interest, security, and redemption provisions as the Administrator
determines as appropriate ;

                        (iv) if the exercise or purchase occurs on or after the
Registration Date, surrender of Shares or delivery of a properly executed form
of attestation of ownership of Shares as the Administrator may require
(including withholding of Shares otherwise deliverable upon exercise of the
Award) which have a Fair Market Value on the date of surrender or attestation
equal to the aggregate exercise price of the Shares as to which said Award shall
be exercised (but only to the extent that such exercise of the Award would not
result in an accounting compensation charge with respect to the Shares used to
pay the exercise price unless otherwise determined by the Administrator);

                        (v) with respect to Options, if the exercise occurs on
or after the Registration Date, payment through a broker-dealer sale and
remittance procedure pursuant to which the Grantee (A) shall provide written
instructions to a Company designated brokerage firm to effect the immediate sale
of some or all of the purchased Shares and remit to the Company, out of the sale
proceeds available on the settlement date, sufficient funds to cover the
aggregate exercise price payable for the purchased Shares and (B) shall provide
written directives to the Company to deliver the certificates for the purchased
Shares directly to such brokerage firm in order to complete the sale
transaction; or

                        (vi) any combination of the foregoing methods of
payment.

                (c) Taxes. No Shares shall be delivered under the Plan to any
Grantee or other person until such Grantee or other person has made arrangements
acceptable to the Administrator for the satisfaction of any foreign, federal,
state, or local income and employment tax withholding obligations, including,
without limitation, obligations incident to the receipt of Shares or the
disqualifying disposition of Shares received on exercise of an Incentive Stock
Option. Upon exercise of an Award the Company shall withhold or collect from
Grantee an amount sufficient to satisfy such tax obligations.


                                       9
<PAGE>   10

        8. Exercise of Award.

                (a) Procedure for Exercise; Rights as a Shareholder.

                        (i) Any Award granted hereunder shall be exercisable at
such times and under such conditions as determined by the Administrator under
the terms of the Plan and specified in the Award Agreement but in the case of an
Option, in no case at a rate of less than twenty percent (20%) per year over
five (5) years from the date the Option is granted, subject to reasonable
conditions such as continued employment. Notwithstanding the foregoing, in the
case of an Option granted to an Officer, Director or Consultant, the Award
Agreement may provide that the Option may become exercisable, subject to
reasonable conditions such as such Officer's, Director's or Consultant's
Continuous Service, at any time or during any period established in the Award
Agreement.

                        (ii) An Award shall be deemed to be exercised when
written notice of such exercise has been given to the Company in accordance with
the terms of the Award by the person entitled to exercise the Award and full
payment for the Shares with respect to which the Award is exercised, including,
to the extent selected, use of the broker-dealer sale and remittance procedure
to pay the purchase price as provided in Section 7(b)(v). Until the issuance (as
evidenced by the appropriate entry on the books of the Company or of a duly
authorized transfer agent of the Company) of the stock certificate evidencing
such Shares, no right to vote or receive dividends or any other rights as a
shareholder shall exist with respect to Shares subject to an Award,
notwithstanding the exercise of an Option or other Award. No adjustment will be
made for a dividend or other right for which the record date is prior to the
date the stock certificate is issued, except as provided in the Award Agreement
or Section 11(a), below.

                (b) Exercise of Award Following Termination of Continuous
Service. In the event of termination of a Grantee's Continuous Service for any
reason other than Disability or death (but not in the event of a Grantee's
change of status from Employee to Consultant or from Consultant to Employee),
such Grantee may, but only during the Post-Termination Exercise Period (but in
no event later than the expiration date of the term of such Award as set forth
in the Award Agreement), exercise the Award to the extent that the Grantee was
entitled to exercise it at the date of such termination or to such other extent
as may be determined by the Administrator. In the event of a Grantee's change of
status from Employee to Consultant, an Employee's Incentive Stock Option shall
convert automatically to a Non-Qualified Stock Option on the day three (3)
months and one day following such change of status. To the extent that the
Grantee is not entitled to exercise the Award at the date of termination, or if
the Grantee does not exercise such Award to the extent so entitled within the
Post-Termination Exercise Period, the Award shall terminate.

                (c) Disability of Grantee. In the event of termination of a
Grantee's Continuous Service as a result of his or her Disability, Grantee may,
but only within twelve (12) months from the date of such termination (and in no
event later than the expiration date of the term of such Award as set forth in
the Award Agreement), exercise the Award to the extent that the Grantee was
otherwise entitled to exercise it at the date of such termination; provided,


                                       10
<PAGE>   11

however, that if such Disability is not a "disability" as such term is defined
in Section 22(e)(3) of the Code, in the case of an Incentive Stock Option such
Incentive Stock Option shall automatically convert to a Non-Qualified Stock
Option on the day three (3) months and one day following such termination. To
the extent that the Grantee is not entitled to exercise the Award at the date of
termination, or if Grantee does not exercise such Award to the extent so
entitled within the time specified herein, the Award shall terminate.

                (d) Death of Grantee. In the event of a termination of the
Grantee's Continuous Service as a result of his or her death, or in the event of
the death of the Grantee during the Post-Termination Exercise Period or during
the twelve (12) month period following the Grantee's Termination of Continuous
Service as a result of his or her Disability, the Grantee's estate or a person
who acquired the right to exercise the Award by bequest or inheritance may
exercise the Award, but only to the extent that the Grantee was entitled to
exercise the Award as of the date of termination, within twelve (12) months from
the date of death (but in no event later than the expiration of the term of such
Award as set forth in the Award Agreement). To the extent that, at the time of
death, the Grantee was not entitled to exercise the Award, or if the Grantee's
estate or a person who acquired the right to exercise the Award by bequest or
inheritance does not exercise such Award to the extent so entitled within the
time specified herein, the Award shall terminate.

        9. Conditions Upon Issuance of Shares.

                (a) Shares shall not be issued pursuant to the exercise of an
Award unless the exercise of such Award and the issuance and delivery of such
Shares pursuant thereto shall comply with all Applicable Laws, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

                (b) As a condition to the exercise of an Award, the Company may
require the person exercising such Award to represent and warrant at the time of
any such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required by any
Applicable Laws.

        10. Repurchase Rights. If the provisions of an Award Agreement grant to
the Company the right to repurchase Shares upon termination of the Grantee's
Continuous Service, the Award Agreement shall (or may, with respect to Awards
granted or issued to Officers, Directors or Consultants) provide that:

                (a) the right to repurchase must be exercised, if at all, within
ninety (90) days of the termination of the Grantee's Continuous Service (or in
the case of Shares issued upon exercise of Awards after the date of termination
of the Grantee's Continuous Service, within ninety (90) days after the date of
the Award exercise);

                (b) the consideration payable for the Shares upon exercise of
such repurchase right shall be made in cash or by cancellation of purchase money
indebtedness within the ninety (90) day periods specified in Section 10(a);


                                       11
<PAGE>   12

                (c) the amount of such consideration shall (i) be equal to the
original purchase price paid by Grantee for each such Share; provided, that the
right to repurchase such Shares at the original purchase price shall lapse at
the rate of at least twenty percent (20%) of the Shares subject to the Award per
year over five (5) years from the date the Award is granted (without respect to
the date the Award was exercised or became exercisable), and (ii) with respect
to Shares, other than Shares subject to repurchase at the original purchase
price pursuant to clause (i) above, not less than the Fair Market Value of the
Shares to be repurchased on the date of termination of Grantee's Continuous
Service; and

                (d) the right to repurchase Shares, other than the right to
repurchase Shares at the original purchase price pursuant to clause (i) of
Section 10(c), shall terminate on the Registration Date.

        11. Adjustments Upon Changes in Capitalization or Corporate Transaction.

                (a) Adjustments upon Changes in Capitalization. Subject to any
required action by the shareholders of the Company, the number of Shares covered
by each outstanding Award, and the number of Shares which have been authorized
for issuance under the Plan but as to which no Awards have yet been granted or
which have been returned to the Plan, the exercise or purchase price of each
such outstanding Award, as well as any other terms that the Administrator
determines require adjustment shall be proportionately adjusted for (i) any
increase or decrease in the number of issued Shares resulting from a stock
split, reverse stock split, stock dividend, combination or reclassification of
the Shares, or similar transaction affecting the Shares, (ii) any other increase
or decrease in the number of issued Shares effected without receipt of
consideration by the Company, or (iii) as the Administrator may determine in its
discretion, any other transaction with respect to Common Stock to which Section
424(a) of the Code applies or a similar transaction; provided, however that
conversion of any convertible securities of the Company shall not be deemed to
have been "effected without receipt of consideration." Such adjustment shall be
made by the Administrator and its determination shall be final, binding and
conclusive. Except as the Administrator determines, no issuance by the Company
of shares of stock of any class, or securities convertible into shares of stock
of any class, shall affect, and no adjustment by reason hereof shall be made
with respect to, the number or price of Shares subject to an Award.

                (b) Corporate Transaction. In the event of a Corporate
Transaction, each Award will terminate immediately prior to the specified
effective date of the Corporate Transaction, unless the Award is assumed by the
successor corporation or Parent thereof in connection with the Corporate
Transaction.

        12. Effective Date and Term of Plan. The Plan shall become effective
upon the earlier to occur of its adoption by the Board or its approval by the
shareholders of the Company. It shall continue in effect for a term of ten (10)
years unless sooner terminated. Subject to Section 16, below, and Applicable
Laws, Awards may be granted under the Plan upon its becoming effective.


                                       12
<PAGE>   13

        13. Amendment, Suspension or Termination of the Plan.

                (a) The Board may at any time amend, suspend or terminate the
Plan. To the extent necessary to comply with Applicable Laws, the Company shall
obtain shareholder approval of any Plan amendment in such a manner and to such a
degree as required.

                (b) No Award may be granted during any suspension of the Plan or
after termination of the Plan.

                (c) Any amendment, suspension or termination of the Plan
(including termination of the Plan under Section 12, above) shall not affect
Awards already granted, and such Awards shall remain in full force and effect as
if the Plan had not been amended, suspended or terminated, unless mutually
agreed otherwise between the Grantee and the Administrator, which agreement must
be in writing and signed by the Grantee and the Company.

        14. Reservation of Shares.

                (a) The Company, during the term of the Plan, will at all times
reserve and keep available such number of Shares as shall be sufficient to
satisfy the requirements of the Plan.

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

        15. No Effect on Terms of Employment/Consulting Relationship. The Plan
shall not confer upon any Grantee any right with respect to the Grantee's
Continuous Service, nor shall it interfere in any way with his or her right or
the Company's right to terminate the Grantee's Continuous Service at any time,
with or without cause.

        16. No Effect on Retirement and Other Benefit Plans. Except as
specifically provided in a retirement or other benefit plan of the Company or a
Related Entity, Awards shall not be deemed compensation for purposes of
computing benefits or contributions under any retirement plan of the Company or
a Related Entity, and shall not affect any benefits under any other benefit plan
of any kind or any benefit plan subsequently instituted under which the
availability or amount of benefits is related to level of compensation. The Plan
is not a "Retirement Plan" or "Welfare Plan" under the Employee Retirement
Income Security Act of 1974, as amended.

        17. Shareholder Approval. Continuance of the Plan shall be subject to
approval by the shareholders of the Company within twelve (12) months before or
after the date the Plan is adopted. Such shareholder approval shall be obtained
in the degree and manner required under Applicable Laws. Any Award exercised
before shareholder approval is obtained shall be rescinded if shareholder
approval is not obtained within the time prescribed, and Shares issued


                                       13
<PAGE>   14

on the exercise of any such Award shall not be counted in determining whether
shareholder approval is obtained.

        18. Information to Grantees. The Company shall provide to each Grantee,
during the period for which such Grantee has one or more Awards outstanding,
copies of financial statements at least annually.




                                       14

<PAGE>   1

                                                                    EXHIBIT 99.2

                                                       AWARD NUMBER: ___________

                                  CALISTA, INC.
                         1999 EMPLOYEE STOCK OPTION PLAN

                          STOCK OPTION AWARD AGREEMENT

        Grant of Option. Calista, Inc., a Delaware corporation (the "Company"),
hereby grants to the Grantee (the "Grantee") named in the Notice of Stock Option
Award (the "Notice"), an option (the "Option") to purchase the Total Number of
Shares of Common Stock subject to the Option (the "Shares") set forth in the
Notice, at the Exercise Price per Share set forth in the Notice (the "Exercise
Price") subject to the terms and provisions of the Notice, this Stock Option
Award Agreement (the "Option Agreement") and the Company's 1999 Employee Stock
Option Plan, as amended from time to time (the "Plan"), which are incorporated
herein by reference. Unless otherwise defined herein, the terms defined in the
Plan shall have the same defined meanings in this Option Agreement.

        If designated in the Notice as an Incentive Stock Option, the Option is
intended to qualify as an Incentive Stock Option as defined in Section 422 of
the Code. However, notwithstanding such designation, to the extent that the
aggregate Fair Market Value of Shares subject to Options designated as Incentive
Stock Options which become exercisable for the first time by the Grantee during
any calendar year (under all plans of the Company or any Parent or Subsidiary)
exceeds $100,000, such excess Options, to the extent of the Shares covered
thereby in excess of the foregoing limitation, shall be treated as Non-Qualified
Stock Options. For this purpose, Incentive Stock Options shall be taken into
account in the order in which they were granted, and the Fair Market Value of
the Shares shall be determined as of the date the Option with respect to such
Shares is awarded.


<PAGE>   2

    Exercise of Option.

        1. Right to Exercise. The Option shall be exercisable during its term in
accordance with the Vesting Schedule set out in the Notice and with the
applicable provisions of the Plan and this Option Agreement. The Option shall be
subject to the provisions of Section 11(b) of the Plan relating to the
exercisability or termination of the Option in the event of a Corporate
Transaction. No partial exercise of the Option may be for less than the lesser
of five percent (5%) of the total number of Shares subject to the Option or the
remaining number of Shares subject to the Option. In no event shall the Company
issue fractional Shares.

                (a) Method of Exercise. The Option shall be exercisable only by
delivery of an Exercise Notice (attached as Exhibit A) which shall state the
election to exercise the Option, the whole number of Shares in respect of which
the Option is being exercised, and such other provisions as may be required by
the Administrator. The Exercise Notice shall be signed by the Grantee and shall
be delivered in person, by certified mail, or by such other method as determined
from time to time by the Administrator to the Company accompanied by payment of
the Exercise Price. The Option shall be deemed to be exercised upon receipt by
the Company of such written notice accompanied by the Exercise Price, which, to
the extent selected, shall be deemed to be satisfied by use of the broker-dealer
sale and remittance procedure to pay the Exercise Price provided in Section
4(d), below.

                (b) Taxes. No Shares will be delivered to the Grantee or other
person pursuant to the exercise of the Option until the Grantee or other person
has made arrangements acceptable to the Administrator for the satisfaction of
applicable income tax, employment tax, and social security tax withholding
obligations, including, without limitation, obligations incident to the receipt
of Shares or the disqualifying disposition of Shares received on exercise of an
Incentive Stock Option. Upon exercise of the Option, the Company or the
Grantee's employer may offset or withhold (from any amount owed by the Company
or the Grantee's employer to the Grantee) or collect from the Grantee or other
person an amount sufficient to satisfy such tax obligations and/or the
employer's withholding obligations.

        2. Grantee's Representations. The Grantee understands that neither the
Option nor the Shares exercisable pursuant to the Option have been registered
under the Securities Act of 1933, as amended or any United States securities
laws. In the event the Shares purchasable pursuant to the exercise of the Option
have not been registered under the Securities Act of 1933, as amended, at the
time the Option is exercised, the Grantee shall, if requested by the Company,
concurrently with the exercise of all or any portion of the Option, deliver to
the Company his or her Investment Representation Statement in the form attached
hereto as Exhibit B.

        3. Method of Payment. Payment of the Exercise Price shall be made by any
of the following, or a combination thereof, at the election of the Grantee;
provided, however, that such exercise method does not then violate any
Applicable Law and, provided further, that the portion of the Exercise Price
equal to the par value of the Shares must be paid in cash or other legal
consideration permitted by the Delaware General Corporation Law:

                (a) cash;


                                       2
<PAGE>   3

                (b) check;

                (c) if the exercise occurs on or after the Registration Date,
surrender of Shares or delivery of a properly executed form of attestation of
ownership of Shares as the Administrator may require (including withholding of
Shares otherwise deliverable upon exercise of the Option) which have a Fair
Market Value on the date of surrender or attestation equal to the aggregate
Exercise Price of the Shares as to which the Option is being exercised;

                (d) if the exercise occurs on or after the Registration Date,
payment through a broker-dealer sale and remittance procedure pursuant to which
the Grantee (i) shall provide written instructions to a Company designated
brokerage firm to effect the immediate sale of some or all of the purchased
Shares and remit to the Company, out of the sale proceeds available on the
settlement date, sufficient funds to cover the aggregate exercise price payable
for the purchased Shares and (ii) shall provide written directives to the
Company to deliver the certificates for the purchased Shares directly to such
brokerage firm in order to complete the sale transaction; or

        4. Termination or Change of Continuous Service. In the event the
Grantee's Continuous Service terminates, the Grantee may, to the extent
otherwise so entitled at the date of such termination (the "Termination Date"),
exercise the Option during the Post-Termination Exercise Period. In no event
shall the Option be exercised later than the Expiration Date set forth in the
Notice. In the event of the Grantee's change in status from Employee, Director
or Consultant to any other status of Employee, Director or Consultant, the
Option shall remain in effect and, except to the extent otherwise determined by
the Administrator, continue to vest; provided, however, with respect to any
Incentive Stock Option that shall remain in effect after a change in status from
Employee to Director or Consultant, such Incentive Stock Option shall cease to
be treated as an Incentive Stock Option and shall be treated as a Non-Qualified
Stock Option on the day three (3) months and one (1) day following such change
in status. Except as provided in Sections 6 and 7 below, to the extent that the
Grantee is not entitled to exercise the Option on the Termination Date, or if
the Grantee does not exercise the Option within the Post-Termination Exercise
Period, the Option shall terminate.

        B. Disability of Grantee. In the event the Grantee's Continuous Service
terminates as a result of his or her Disability, the Grantee may, but only
within twelve (12) months from the Termination Date (and in no event later than
the Expiration Date), exercise the Option to the extent he or she was otherwise
entitled to exercise it on the Termination Date; provided, however, that if such
Disability is not a "disability" as such term is defined in Section 22(e)(3) of
the Code and the Option is an Incentive Stock Option, such Incentive Stock
Option shall cease to be treated as an Incentive Stock Option and shall be
treated as a Non-Qualified Stock Option on the day three (3) months and one (1)
day following the Termination Date. To the extent that the Grantee is not
entitled to exercise the Option on the Termination Date, or if the Grantee does
not exercise the Option to the extent so entitled within the time specified
herein, the Option shall terminate.


                                       3
<PAGE>   4

        5. Death of Grantee. In the event of the termination of the Grantee's
Continuous Service as a result of his or her death, or in the event of the
Grantee's death during the Post-Termination Exercise Period or during the twelve
(12) month period following the Grantee's Termination of Continuous Service as a
result of his or her Disability, the Grantee's estate, or a person who acquired
the right to exercise the Option by bequest or inheritance, may exercise the
Option, but only to the extent the Grantee could exercise the Option at the date
of termination, within twelve (12) months from the date of death (but in no
event later than the Expiration Date). To the extent that the Grantee is not
entitled to exercise the Option on the date of death, or if the Option is not
exercised to the extent so entitled within the time specified herein, the Option
shall terminate.

        6. Transferability of Option. The Option, if an Incentive Stock Option,
may not be transferred in any manner other than by will or by the laws of
descent and distribution and may be exercised during the lifetime of the Grantee
only by the Grantee. The Option, if a Non-Qualified Stock Option may be
transferred by will, by the laws of descent and distribution, and to the extent
and in the manner authorized by the Administrator, to members of the Grantee's
immediate family (as determined by the Administrator) or pursuant to a domestic
relations order. The terms of the Option shall be binding upon the executors,
administrators, heirs and successors of the Grantee.

        7. Term of Option. The Option may be exercised no later than the
Expiration Date set forth in the Notice or such earlier date as otherwise
provided herein.

        8. Company's Right of First Refusal.

                (a) Transfer Notice. Neither the Grantee nor a transferee
(either being sometimes referred to herein as the "Holder") shall sell,
hypothecate, encumber or otherwise transfer any Shares or any right or interest
therein without first complying with the provisions of this Section 10 or
obtaining the prior written consent of the Company. In the event the Holder
desires to accept a bona fide third-party offer for any or all of the Shares,
the Holder shall provide the Company with written notice (the "Transfer Notice")
of:

                        a. The Holder's intention to transfer;

                        b. The name of the proposed transferee;

                        c. The number of Shares to be transferred; and

                        d. The proposed transfer price or value and terms
                           thereof.


                                       4
<PAGE>   5

                (b) First Refusal Exercise Notice. The Company shall have the
right to purchase (the "Right of First Refusal") all but not less than all, of
the Shares which are described in the Transfer Notice (the "Offered Shares") at
any time during the period commencing upon receipt of the Transfer Notice and
ending forty-five (45) days after the first date on which the Company determines
that the Right of First Refusal may be exercised without incurring an accounting
expense with respect to such exercise (the "Option Period") at the per share
price or value and in accordance with the terms stated in the Transfer Notice,
which Right of First Refusal shall be exercised by written notice (the "First
Refusal Exercise Notice") to the Holder. During the Option Period and the
120-day period following the expiration of the Option Period, the Company also
may exercise its Repurchase Right in lieu or in addition to its Right of First
Refusal if the Repurchase Right is or becomes exercisable during the Option
Period or such 120-day period.

                (c) Payment Terms. The Company shall consummate the purchase of
the Offered Shares on the terms set forth in the Transfer Notice within 15 days
after delivery of the First Refusal Exercise Notice; provided, however, that in
the event the Transfer Notice provides for the payment for the Offered Shares
other than in cash, the Company and/or its assigns shall have the right to pay
for the Offered Shares by the discounted cash equivalent of the consideration
described in the Transfer Notice as reasonably determined by the Administrator.
Upon payment for the Offered Shares to the Holder or into escrow for the benefit
of the Holder, the Company or its assigns shall become the legal and beneficial
owner of the Offered Shares and all rights and interest therein or related
thereto, and the Company shall have the right to transfer the Offered Shares to
its own name or its assigns without the further action by the Holder.

        2. Assignment. Whenever the Company shall have the right to purchase
Shares under this Right of First Refusal, the Company may designate and assign
one or more employees, officers, directors or Stockholders of the Company or
other persons or organizations, to exercise all or a part of the Company's Right
of First Refusal.

                (d) Non-Exercise. If the Company and/or its assigns do not
collectively elect to exercise the Right of First Refusal within the Option
Period or such earlier time if the Company and/or its assigns notifies the
Holder that it will not exercise the Right of First Refusal, then the Holder may
transfer the Shares upon the terms and conditions stated in the Transfer Notice,
provided that:

                        a. The transfer is made within 120 days of the
expiration of the Option Period; and

                        b. The transferee agrees in writing that such Shares
shall be held subject to the provisions of this Option Agreement.

                (e) Expiration of Transfer Period. Following such 120-day
period, no transfer of the Offered Shares and no change in the terms of the
transfer as stated in the Transfer Notice (including the name of the proposed
transferee) shall be permitted without a new written Transfer Notice prepared
and submitted in accordance with the requirements of this Right of First
Refusal.


                                       5
<PAGE>   6

                (f) Exception for Certain Family Transfers. Anything to the
contrary contained in this section notwithstanding, the transfer of any or all
of the Shares during the Grantee's lifetime or on the Grantee's death by will or
intestacy to the Grantee's Immediate Family or a trust for the benefit of the
Grantee or the Grantee's Immediate Family shall be exempt from the provisions of
this Right of First Refusal (a "Permitted Transfer"); provided, however, that
(i) the transferee or other recipient shall receive and hold the Shares so
transferred subject to the provisions of this Option Agreement, and there shall
be no further transfer of such Shares except in accordance with the terms of
this Option Agreement and (ii) prior to any such transfer, each transferee shall
execute an agreement pursuant to which such transferee shall agree to receive
and hold such Shares subject to the provisions of this Option Agreement.
"Immediate Family" as used herein shall mean spouse, domestic partner (as
determined by the Administrator), child, lineal descendant or antecedent,
father, mother, brother or sister and the lineal descendants of such
individuals.

                (g) Termination of Right of First Refusal. The provisions of
this Right of First Refusal shall terminate as to all Shares upon the
Registration Date.

                (h) Additional Shares or Substituted Securities. In the event of
any transaction described in Section 11 of the Plan, any new, substituted or
additional securities or other property which is by reason of any such
transaction distributed with respect to the Shares shall be immediately subject
to the Right of First Refusal, but only to the extent the Shares are at the time
covered by such right.

                (i) Corporate Transaction. Immediately prior to the consummation
of a Corporate Transaction, the Right of First Refusal shall automatically lapse
in its entirety, except to the extent this Option Agreement is assumed by the
successor corporation (or its Parent) in connection with such Corporate
Transaction, in which case the Right of First Refusal shall apply to the new
capital stock or other property received in exchange for the Shares in
consummation of the Corporate Transaction, but only to the extent the Shares are
at the time covered by such right.

        9. Stop-Transfer Notices. In order to ensure compliance with the
restrictions on transfer set forth in this Option Agreement, the Notice or the
Plan, the Company may issue appropriate "stop transfer" instructions to its
transfer agent, if any, and, if the Company transfers its own securities, it may
make appropriate notations to the same effect in its own records.

        10. Refusal to Transfer. The Company shall not be required (i) to
transfer on its books any Shares that have been sold or otherwise transferred in
violation of any of the provisions of this Option Agreement or (ii) to treat as
owner of such Shares or to accord the right to vote or pay dividends to any
purchaser or other transferee to whom such Shares shall have been so
transferred.


                                       6
<PAGE>   7

        11. Tax Consequences. Set forth below is a brief summary as of the date
of this Option Agreement of some of the federal tax consequences of exercise of
the Option and disposition of the Shares. THIS SUMMARY IS NECESSARILY
INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. THE GRANTEE
SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THE OPTION OR DISPOSING OF THE
SHARES.

                (a) Exercise of Incentive Stock Option. If the Option qualifies
as an Incentive Stock Option, there will be no regular federal income tax
liability upon the exercise of the Option, although the excess, if any, of the
Fair Market Value of the Shares on the date of exercise over the Exercise Price
will be treated as income for purposes of the alternative minimum tax for
federal tax purposes and may subject the Grantee to the alternative minimum tax
in the year of exercise.

                (b) Exercise of Incentive Stock Option Following Disability. If
the Grantee's Continuous Service terminates as a result of Disability that is
not total and permanent disability as defined in Section 22(e)(3) of the Code,
to the extent permitted on the date of termination, the Grantee must exercise an
Incentive Stock Option within three (3) months of such termination for the
Incentive Stock Option to be qualified as an Incentive Stock Option.

                (c) Exercise of Non-Qualified Stock Option. On exercise of a
Non-Qualified Stock Option, the Grantee will be treated as having received
compensation income (taxable at ordinary income tax rates) equal to the excess,
if any, of the Fair Market Value of the Shares on the date of exercise over the
Exercise Price. If the Grantee is an Employee or a former Employee, the Company
will be required to withhold from the Grantee's compensation or collect from the
Grantee and pay to the applicable taxing authorities an amount in cash equal to
a percentage of this compensation income at the time of exercise, and may refuse
to honor the exercise and refuse to deliver Shares if such withholding amounts
are not delivered at the time of exercise.

                (d) Disposition of Shares. In the case of a Non-Qualified Stock
Option, if Shares are held for more than one year, any gain realized on
disposition of the Shares will be treated as long-term capital gain for federal
income tax purposes and subject to tax at a maximum rate of 20%. In the case of
an Incentive Stock Option, if Shares transferred pursuant to the Option are held
for more than one year after receipt of the Shares and are disposed more than
two years after the Date of Award, any gain realized on disposition of the
Shares also will be treated as capital gain for federal income tax purposes and
subject to the same tax rates and holding periods that apply to Shares acquired
upon exercise of a Non-Qualified Stock Option. If Shares purchased under an
Incentive Stock Option are disposed of prior to the expiration of such one-year
or two-year periods, any gain realized on such disposition will be treated as
compensation income (taxable at ordinary income rates) to the extent of the
difference between the Exercise Price and the lesser of (i) the Fair Market
Value of the Shares on the date of exercise, or (ii) the sale price of the
Shares.


                                       7
<PAGE>   8

        12. Lock-Up Agreement.

                (a) Agreement. The Grantee, if requested by the Company and the
lead underwriter of any public offering of the Common Stock or other securities
of the Company (the "Lead Underwriter"), hereby irrevocably agrees not to sell,
contract to sell, grant any option to purchase, transfer the economic risk of
ownership in, make any short sale of, pledge or otherwise transfer or dispose of
any interest in any Common Stock or any securities convertible into or
exchangeable or exercisable for or any other rights to purchase or acquire
Common Stock (except Common Stock included in such public offering or acquired
on the public market after such offering) during the 180-day period following
the effective date of a registration statement of the Company filed under the
Securities Act of 1933, as amended, or such shorter period of time as the Lead
Underwriter shall specify. The Grantee further agrees to sign such documents as
may be requested by the Lead Underwriter to effect the foregoing and agrees that
the Company may impose stop-transfer instructions with respect to such Common
Stock subject until the end of such period. The Company and the Grantee
acknowledge that each Lead Underwriter of a public offering of the Company's
stock, during the period of such offering and for the 180-day period thereafter,
is an intended beneficiary of this Section 14.

                (b) No Amendment Without Consent of Underwriter. During the
period from identification as a Lead Underwriter in connection with any public
offering of the Company's Common Stock until the earlier of (i) the expiration
of the lock-up period specified in Section 16(a) in connection with such
offering or (ii) the abandonment of such offering by the Company and the Lead
Underwriter, the provisions of this Section 14 may not be amended or waived
except with the consent of the Lead Underwriter.

        13. Entire Agreement: Governing Law. The Notice, the Plan and this
Option Agreement constitute the entire agreement of the parties with respect to
the subject matter hereof and supersede in their entirety all prior undertakings
and agreements of the Company and the Grantee with respect to the subject matter
hereof, and may not be modified adversely to the Grantee's interest except by
means of a writing signed by the Company and the Grantee. Nothing in the Notice,
the Plan and this Option Agreement (except as expressly provided therein) is
intended to confer any rights or remedies on any persons other than the parties.
The Notice, the Plan and this Option Agreement are to be construed in accordance
with and governed by the internal laws of the State of Delaware without giving
effect to any choice of law rule that would cause the application of the laws of
any jurisdiction other than the internal laws of the State of Delaware to the
rights and duties of the parties. Should any provision of the Notice, the Plan
or this Option Agreement be determined by a court of law to be illegal or
unenforceable, such provision shall be enforced to the fullest extent allowed by
law and the other provisions shall nevertheless remain effective and shall
remain enforceable.

        14. Headings. The captions used in the Notice and this Option Agreement
are inserted for convenience and shall not be deemed a part of the Option for
construction or interpretation.


                                       8
<PAGE>   9

        15. Dispute Resolution The provisions of this Section 17 shall be the
exclusive means of resolving disputes arising out of or relating to the Notice,
the Plan and this Option Agreement. The Company, the Grantee, and the Grantee's
assignees pursuant to Section 10 or a Permitted Transfer (the "parties") shall
attempt in good faith to resolve any disputes arising out of or relating to the
Notice, the Plan and this Option Agreement by negotiation between individuals
who have authority to settle the controversy. Negotiations shall be commenced by
either party by notice of a written statement of the party's position and the
name and title of the individual who will represent the party. Within thirty
(30) days of the written notification, the parties shall meet at a mutually
acceptable time and place, and thereafter as often as they reasonably deem
necessary, to resolve the dispute. If the dispute has not been resolved by
negotiation, the parties agree that any suit, action, or proceeding arising out
of or relating to the Notice, the Plan or this Option Agreement shall be brought
in the United States District Court for the Northern District of California (or
should such court lack jurisdiction to hear such action, suit or proceeding, in
a California state court in the County of San Francisco) and that the parties
shall submit to the jurisdiction of such court. The parties irrevocably waive,
to the fullest extent permitted by law, any objection the party may have to the
laying of venue for any such suit, action or proceeding brought in such court.
THE PARTIES ALSO EXPRESSLY WAIVE ANY RIGHT THEY HAVE OR MAY HAVE TO A JURY TRIAL
OF ANY SUCH SUIT, ACTION OR PROCEEDING. If any one or more provisions of this
Section 17 shall for any reason be held invalid or unenforceable, it is the
specific intent of the parties that such provisions shall be modified to the
minimum extent necessary to make it or its application valid and enforceable.

Notices. Any notice required or permitted hereunder shall be given in writing
and shall be deemed effectively given upon personal delivery or upon deposit in
the United States mail by certified mail (if the parties are within the United
States) or upon deposit for delivery by an internationally recognized express
mail courier service (for international delivery of notice), with postage and
fees prepaid, addressed to the other party at its address as shown beneath its
signature in the Notice, or to such other address as such party may designate in
writing from time to time to the other party.


<PAGE>   1

                                                                    EXHIBIT 99.3

                               CISCO SYSTEMS, INC.

                        STOCK OPTION ASSUMPTION AGREEMENT
                                  CALISTA, INC.
                         1999 EMPLOYEE STOCK OPTION PLAN

OPTIONEE:  <<First_Name>> <<Last_Name>>,

        STOCK OPTION ASSUMPTION AGREEMENT effective as of the 12th day of
November, 1999 by Cisco Systems, Inc., a California corporation ("Cisco").

        WHEREAS, the undersigned individual ("Optionee") holds one or more
outstanding options to purchase shares of the common stock of Calista, Inc., a
Delaware corporation ("Calista"), which were granted to Optionee under the
Calista, Inc. 1999 Employee Stock Option Plan (the "Plan") and are each
evidenced by a Notice of Stock Option Award and a Stock Option Award Agreement
(collectively, the "Option Agreement").

        WHEREAS, Calista has been acquired by Cisco through the merger of
Calista with and into Cisco (the "Merger") pursuant to the Agreement and Plan of
Merger and Reorganization, by and between Cisco and Calista (the "Merger
Agreement").

        WHEREAS, the provisions of the Merger Agreement require Cisco to assume
all obligations of Calista under all outstanding options under the Plan at the
consummation of the Merger and to issue to the holder of each outstanding option
an agreement evidencing the assumption of such option.

        WHEREAS, pursuant to the provisions of the Merger Agreement, the
exchange ratio (the "Exchange Ratio") in effect for the Merger is 0.052774 of a
share of Cisco common stock ("Cisco Stock") for each outstanding share of
Calista common stock ("Calista Stock").

        WHEREAS, this Agreement became effective immediately upon the
consummation of the Merger (the "Effective Time") in order to reflect certain
adjustments to Optionee's outstanding options which have become necessary by
reason of the assumption of those options by Cisco in connection with the
Merger.

        NOW, THEREFORE, it is hereby agreed as follows:

        1. The number of shares of Calista Stock subject to the options held by
Optionee immediately prior to the Effective Time (the "Calista Options") and the
exercise price payable per share are set forth below. Cisco hereby assumes, as
of the Effective Time, all the duties and obligations of Calista under each of
the Calista Options. In connection with such assumption, the number of shares of
Cisco Stock purchasable under each Calista Option hereby assumed and the
exercise price payable thereunder have been adjusted to reflect the Exchange
Ratio. Accordingly, the number of shares of Cisco Stock subject to each Calista
Option hereby assumed shall be as specified for that option below, and the
adjusted exercise price payable per


<PAGE>   2

share of Cisco Stock under the assumed Calista Option shall also be as indicated
for that option below.

<TABLE>
<CAPTION>
             CALISTA STOCK OPTIONS                            CISCO ASSUMED OPTIONS
 -------------------------------------------        ----------------------------------------
                                                      # of Shares
 # of Shares of Calista       Exercise Price           of Cisco            Adjusted Exercise
      Common Stock               per Share           Common Stock           Price per Share
 ----------------------       --------------        ----------------       -----------------
<S>                           <C>                   <C>                    <C>
     Calista Shares           $Calista Price        <<Cisco_Shares>>        $<<Cisco_Price>>
</TABLE>

        2. The intent of the foregoing adjustments to each assumed Calista
Option is to assure that the spread between the aggregate fair market value of
the shares of Cisco Stock purchasable under each such option and the aggregate
exercise price as adjusted pursuant to this Agreement will, immediately after
the consummation of the Merger, be not less than the spread which existed,
immediately prior to the Merger, between the then aggregate fair market value of
the Calista Stock subject to the Calista Option and the aggregate exercise price
in effect at such time under the Option Agreement. Such adjustments are also
intended to preserve, immediately after the Merger, on a per share basis, the
same ratio of exercise price per option share to fair market value per share
which existed under the Calista Option immediately prior to the Merger.

        3. The following provisions shall govern each Calista Option hereby
assumed by Cisco:

                (a) Unless the context otherwise requires, all references in
        each Option Agreement and, if applicable, in the Plan (as incorporated
        into such Option Agreement) (i) to the "Company" shall mean Cisco, (ii)
        to "Common Stock", "Stock" or "Share" shall mean share of Cisco Stock,
        (iii) to the "Board" shall mean the Board of Directors of Cisco and (iv)
        to the "Committee" shall mean the Compensation Committee of the Cisco
        Board of Directors and (v) to the "Administrator" shall mean the Cisco
        Board of Directors or the Cisco Compensation Committee, as appropriate.

                (b) The award date and the expiration date of each assumed
        Calista Option and all other provisions which govern either the exercise
        or the termination of the assumed Calista Option shall remain the same
        as set forth in the Option Agreement applicable to that option, and the
        provisions of the Option Agreement shall accordingly govern and control
        Optionee's rights under this Agreement to purchase Cisco Stock.

                (c) Pursuant to your Option Agreement, none of your options
        assumed by Cisco in connection with the transaction will vest and become
        exercisable on an accelerated basis upon the consummation of the Merger.
        Each Calista Option shall be assumed by Cisco as of the Effective Time.
        Each such assumed Calista Option shall thereafter continue to vest for
        any remaining unvested shares of Cisco Stock subject to that option in
        accordance with the same installment vesting schedule in effect under
        the applicable Option Agreement immediately prior to the Effective Time;
        provided, however, that the number of


                                       2
<PAGE>   3

        shares subject to each such installment shall be adjusted to reflect the
        Exchange Ratio.

                (d) For purposes of applying any and all provisions of the
        Option Agreement and/or the Plan relating to Optionee's status as an
        employee or a consultant of Calista, Optionee shall be deemed to
        continue in such status as an employee or a consultant for so long as
        Optionee renders services as an employee or a consultant to Cisco or any
        present or future Cisco subsidiary. Accordingly, the provisions of the
        Option Agreement governing the termination of the assumed Calista
        Options upon Optionee's cessation of service as an employee or a
        consultant of Calista shall hereafter be applied on the basis of
        Optionee's cessation of employee or consultant status with Cisco and its
        subsidiaries, and each assumed Calista Option shall accordingly
        terminate thirty (30)-days following such cessation of service as an
        employee or a consultant of Cisco and its subsidiaries.

                (e) The adjusted exercise price payable for the Cisco Stock
        subject to each assumed Calista Option shall be payable in any of the
        forms authorized under the Option Agreement applicable to that option.
        For purposes of determining the holding period of any shares of Cisco
        Stock delivered in payment of such adjusted exercise price, the period
        for which such shares were held as Calista Stock prior to the Merger
        shall be taken into account.

                (f) In order to exercise each assumed Calista Option, Optionee
        must deliver to Cisco a written notice of exercise in which the number
        of shares of Cisco Stock to be purchased thereunder must be indicated.
        The exercise must be for at least five percent (5%) of the total number
        of Shares subject to the Calista Option (or, if less than five percent
        (5%), the total remaining Shares subject to the Calista Option). The
        exercise notice must be accompanied by payment of the adjusted exercise
        price payable for the purchased shares of Cisco Stock and should be
        delivered to Cisco at the following address:

                             Cisco Systems, Inc.
                             170 West Tasman Drive
                             MS 11-3
                             San Jose, CA 95134
                             Attention:  Stock Administration

        4. Except to the extent specifically modified by this Option Assumption
Agreement, all of the terms and conditions of each Option Agreement as in effect
immediately prior to the Merger shall continue in full force and effect and
shall not in any way be amended, revised or otherwise affected by this Stock
Option Assumption Agreement.


                                       3
<PAGE>   4

        IN WITNESS WHEREOF, Cisco Systems, Inc. has caused this Stock Option
Assumption Agreement to be executed on its behalf by its duly-authorized officer
as of the 12th day of November, 1999.

                                            CISCO SYSTEMS, INC.

                                            By: /s/ LARRY R. CARTER
                                               ---------------------------------
                                               Larry R. Carter
                                               Corporate Secretary


                                 ACKNOWLEDGMENT

        The undersigned acknowledges receipt of the foregoing Stock Option
Assumption Agreement and understands that all rights and liabilities with
respect to each of his or her Calista Options hereby assumed by Cisco are as set
forth in the Option Agreement, the Plan, as applicable, and such Stock Option
Assumption Agreement.



                                          --------------------------------------
                                          <<FIRST_NAME>> <<LAST_NAME>>, OPTIONEE



DATED:  __________________, _____


                                       4

<PAGE>   1

                                                                    EXHIBIT 99.4

                                                                    Acceleration

                               CISCO SYSTEMS, INC.

                        STOCK OPTION ASSUMPTION AGREEMENT
                                  CALISTA, INC.
                         1999 EMPLOYEE STOCK OPTION PLAN

OPTIONEE:  <<First_Name>> <<Last_Name>>,

        STOCK OPTION ASSUMPTION AGREEMENT effective as of the 12th day of
November, 1999 by Cisco Systems, Inc., a California corporation ("Cisco").

        WHEREAS, the undersigned individual ("Optionee") holds one or more
outstanding options to purchase shares of the common stock of Calista, Inc., a
Delaware corporation ("Calista"), which were granted to Optionee under the
Calista, Inc. 1999 Employee Stock Option Plan (the "Plan") and are each
evidenced by a Notice of Stock Option Award and a Stock Option Award Agreement
(collectively, the "Option Agreement").

        WHEREAS, Calista has been acquired by Cisco through the merger of
Calista with and into Cisco (the "Merger") pursuant to the Agreement and Plan of
Reorganization, by and between Cisco and Calista (the "Merger Agreement").

        WHEREAS, the provisions of the Merger Agreement require Cisco to assume
all obligations of Calista under all outstanding options under the Plan at the
consummation of the Merger and to issue to the holder of each outstanding option
an agreement evidencing the assumption of such option.

        WHEREAS, pursuant to the provisions of the Merger Agreement, the
exchange ratio (the "Exchange Ratio") in effect for the Merger is 0.052774 of a
share of Cisco common stock ("Cisco Stock") for each outstanding share of
Calista common stock ("Calista Stock").

        WHEREAS, this Agreement became effective immediately upon the
consummation of the Merger (the "Effective Time") in order to reflect certain
adjustments to Optionee's outstanding options which have become necessary by
reason of the assumption of those options by Cisco in connection with the
Merger.

        NOW, THEREFORE, it is hereby agreed as follows:

        1. The number of shares of Calista Stock subject to the options held by
Optionee immediately prior to the Effective Time (the "Calista Options") and the
exercise price payable per share are set forth below. Cisco hereby assumes, as
of the Effective Time, all the duties and obligations of Calista under each of
the Calista Options. In connection with such assumption, the number of shares of
Cisco Stock purchasable under each Calista Option hereby assumed and the
exercise price payable thereunder have been adjusted to reflect the Exchange
Ratio. Accordingly, the number of shares of Cisco Stock subject to each Calista
Option hereby assumed shall be as specified for that option below, and the
adjusted exercise price payable per


<PAGE>   2

share of Cisco Stock under the assumed Calista Option shall also be as indicated
for that option below.

<TABLE>
<CAPTION>
             CALISTA STOCK OPTIONS                            CISCO ASSUMED OPTIONS
  -------------------------------------------     -------------------------------------------
  # of Shares of Calista       Exercise Price     # of Shares of Cisco      Adjusted Exercise
       Common Stock              per Share            Common Stock           Price per Share
  ----------------------       --------------     --------------------      -----------------
 <S>                           <C>                <C>                       <C>
      Calista Shares           $Calista Price        <<Cisco_Shares>>        $<<Cisco_Price>>
</TABLE>

        2. The intent of the foregoing adjustments to each assumed Calista
Option is to assure that the spread between the aggregate fair market value of
the shares of Cisco Stock purchasable under each such option and the aggregate
exercise price as adjusted pursuant to this Agreement will, immediately after
the consummation of the Merger, be not less than the spread which existed,
immediately prior to the Merger, between the then aggregate fair market value of
the Calista Stock subject to the Calista Option and the aggregate exercise price
in effect at such time under the Option Agreement. Such adjustments are also
intended to preserve, immediately after the Merger, on a per share basis, the
same ratio of exercise price per option share to fair market value per share
which existed under the Calista Option immediately prior to the Merger.

        3. The following provisions shall govern each Calista Option hereby
assumed by Cisco:

                (a) Unless the context otherwise requires, all references in
        each Option Agreement and, if applicable, in the Plan (as incorporated
        into such Option Agreement) (i) to the "Company" shall mean Cisco, (ii)
        to "Common Stock", "Stock" or "Share" shall mean a share of Cisco Stock,
        (iii) to the "Board" shall mean the Board of Directors of Cisco and (iv)
        to the "Committee" shall mean the Compensation Committee of the Cisco
        Board of Directors and (v) to the "Administrator" shall mean the Cisco
        Board of Directors or the Cisco Compensation Committee, as appropriate.

                (b) The award date and the expiration date of each assumed
        Calista Option and all other provisions which govern either the exercise
        or the termination of the assumed Calista Option shall remain the same
        as set forth in the Option Agreement applicable to that option, and the
        provisions of the Option Agreement shall accordingly govern and control
        Optionee's rights under this Agreement to purchase Cisco Stock.

                (c) Your Calista Option shall be assumed by Cisco as of the
        Effective Time. Pursuant to the terms of Amendment No. 1 to your Notice
        of Stock Option Award, which is incorporated by reference in your Option
        Agreement, your option assumed by Cisco in connection with the
        transaction will vest and become exercisable on an accelerated basis
        upon the consummation of the Merger. Accordingly, 25% of the Shares
        subject to your Calista Option vested immediately upon Consummation of
        the Merger, an additional 18.75% of the


                                       2
<PAGE>   3

        Shares subject to your Calista Option shall vest one year from the date
        of the consummation of the Merger and an additional 1.5625% of the
        Shares subject to your Calista Option shall vest monthly thereafter.

                (d) For purposes of applying any and all provisions of the
        Option Agreement and/or the Plan relating to Optionee's status as an
        employee or a consultant of Calista, Optionee shall be deemed to
        continue in such status as an employee or a consultant for so long as
        Optionee renders services as an employee or a consultant to Cisco or any
        present or future Cisco subsidiary. Accordingly, the provisions of the
        Option Agreement governing the termination of the assumed Calista
        Options upon Optionee's cessation of service as an employee or a
        consultant of Calista shall hereafter be applied on the basis of
        Optionee's cessation of employee or consultant status with Cisco and its
        subsidiaries, and each assumed Calista Option shall accordingly
        terminate thirty (30)-days following such cessation of service as an
        employee or a consultant of Cisco and its subsidiaries.

                (e) The adjusted exercise price payable for the Cisco Stock
        subject to each assumed Calista Option shall be payable in any of the
        forms authorized under the Option Agreement applicable to that option.
        For purposes of determining the holding period of any shares of Cisco
        Stock delivered in payment of such adjusted exercise price, the period
        for which such shares were held as Calista Stock prior to the Merger
        shall be taken into account.

                (f) In order to exercise each assumed Calista Option, Optionee
        must deliver to Cisco a written notice of exercise in which the number
        of shares of Cisco Stock to be purchased thereunder must be indicated.
        The exercise must be for at least five percent (5%) of the total number
        of Shares subject to the assumed Calista Option (or, if less than five
        percent (5%), the total remaining number of Shares subject to the
        Calista Option). The exercise notice must be accompanied by payment of
        the adjusted exercise price payable for the purchased shares of Cisco
        Stock and should be delivered to Cisco at the following address:

                             Cisco Systems, Inc.
                             170 West Tasman Drive
                             MS 11-3
                             San Jose, CA 95134-1706
                             Attention:  Stock Administration

        4. Except to the extent specifically modified by this Option Assumption
Agreement, all of the terms and conditions of each Option Agreement as in effect
immediately prior to the Merger shall continue in full force and effect and
shall not in any way be amended, revised or otherwise affected by this Stock
Option Assumption Agreement.


                                       3
<PAGE>   4

        IN WITNESS WHEREOF, Cisco Systems, Inc. has caused this Stock Option
Assumption Agreement to be executed on its behalf by its duly-authorized officer
as of the 12th day of November, 1999.


                                            CISCO SYSTEMS, INC.


                                            By: LARRY R. CARTER
                                               ---------------------------------
                                               Larry R. Carter
                                               Corporate Secretary


                                 ACKNOWLEDGMENT

        The undersigned acknowledges receipt of the foregoing Stock Option
Assumption Agreement and understands that all rights and liabilities with
respect to each of his or her Calista Options hereby assumed by Cisco are as set
forth in the Option Agreement, the Plan, as applicable, and such Stock Option
Assumption Agreement.


                                          <<FIRST_NAME>> <<LAST_NAME>>, OPTIONEE


DATED: __________________, ____


                                       4


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