OCTEL COMMUNICATIONS CORP
S-8, 1997-01-31
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1
        AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 31, 1997
                                                REGISTRATION NO. 333-___________

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                        OCTEL COMMUNICATIONS CORPORATION
               (EXACT NAME OF ISSUER AS SPECIFIED IN ITS CHARTER)

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

       DELAWARE                                         77-0029449
(STATE OF INCORPORATION)                 (I.R.S. EMPLOYER IDENTIFICATION NUMBER)
                    

                             1001 MURPHY RANCH ROAD
                         MILPITAS, CALIFORNIA 95035-7912
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
                              --------------------
                        1987 EMPLOYEE STOCK PURCHASE PLAN
                          1996 SUPPLEMENTAL STOCK PLAN
                            (FULL TITLE OF THE PLAN)
                              --------------------
                              DEREK S. DALEY, ESQ.
                            VICE PRESIDENT, SECRETARY
                               AND GENERAL COUNSEL
                        OCTEL COMMUNICATIONS CORPORATION
                             1001 MURPHY RANCH ROAD
                         MILPITAS, CALIFORNIA 95035-7912
                                 (408) 321-2000
            (NAME, ADDRESS, INCLUDING ZIP CODE AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                              --------------------
                                    Copy to:
                                Mark Bonham, Esq.
                    WILSON, SONSINI, GOODRICH & ROSATI, P.C.
                               650 Page Mill Road
                        Palo Alto, California 94304-1050

                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
====================================================================================================================================
                                                                            PROPOSED             PROPOSED
                                                                            MAXIMUM               MAXIMUM            AMOUNT OF
                TITLE OF SECURITIES                AMOUNT TO BE          OFFERING PRICE          AGGREGATE         REGISTRATION
                  TO BE REGISTERED                  REGISTERED             PER SHARE          OFFERING PRICE            FEE
- ------------------------------------------------------------------------------------------------------------------------------------

<S>                                              <C>                      <C>              <C>                        <C>   
  - 1987 Employee Stock Purchase Plan            1,500,000 shares         $15.0875(1)      $22,631,250(1)             $  6,858
  - 1996 Supplemental Stock Plan                 1,000,000 shares         $  17.75(2)      $17,750,000                $  5,379
     TOTAL                                       2,500,000 SHARES                          $40,381,250                $ 12,237
====================================================================================================================================
</TABLE>

(1) Estimated pursuant to Rule 457(h) solely for purposes of calculating the
    registration fee on the basis of 85% of the closing price of $17.75 per
    share reported in the Nasdaq National Market on January 24, 1997.

(2) Estimated pursuant to Rule 457(h) solely for purposes of calculating the
    registration fee on the basis of the closing price of $17.75 per share
    reported in the Nasdaq National Market on January 24, 1997.
<PAGE>   2
                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents and information previously filed with the
Securities and Exchange Commission by Octel Communications Corporation (the
"Company") are hereby incorporated by reference in this Registration Statement:

         (1) The Company's Annual Report on Form 10-K for the fiscal year ended
June 30, 1996, filed pursuant to Section 13 of the Securities Exchange Act of
1934, as amended (the "Exchange Act").

         (2) The Company's Quarterly Report on Form 10-Q for the fiscal quarter
ended September 30, 1996, filed pursuant to Section 13 of the Exchange Act.

         (3) The description of the Company's Common Stock contained in the
Company's Registration Statement on Form 8-B filed February 12, 1990 pursuant to
Section 12(g) of the Exchange Act.

         (4) The description of the Company's Common Share Purchase Rights
contained in the Company's Registration Statement on Form 8-A filed August 1,
1990, as amended, pursuant to Section 12(g) of the Exchange Act.

         All documents subsequently filed by the Company pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a
post-effective amendment which indicates that all securities registered have
been sold or which deregisters all securities then remaining unsold, shall be
deemed to be incorporated by reference in this Registration Statement and to be
part hereof from the date of filing of such documents.

ITEM 4.  DESCRIPTION OF SECURITIES.

         Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

         Counsel for the Company, Wilson, Sonsini, Goodrich & Rosati,
Professional Corporation, 650 Page Mill Road, Palo Alto, California 94304, has
rendered an opinion to the effect that the Common Stock offered hereby, when
offered and sold in accordance with the related plans and agreements, will be
duly and validly issued, fully paid and nonassessable. Certain members of
Wilson, Sonsini, Goodrich & Rosati, Professional Corporation, or investment
partnerships of which such persons are partners, beneficially own approximately
7,500 shares of the Company's Common Stock.

                                      II-1
<PAGE>   3
ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Section 145 of the Delaware General Corporation Law 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 such indemnification under
certain circumstances for liabilities (including reimbursement for expenses
incurred) arising under the Securities Act of 1933, as amended (the "Securities
Act"). Further, in accordance with the Delaware General Corporation Law, the
Company's Certificate of Incorporation eliminates the liability of a director of
the Company to the Company and its stockholders for monetary damages for
breaches of such director's fiduciary duty of care in certain instances. Article
VI of the Bylaws of the Company provides for indemnification of certain agents
to the maximum extent permitted by the Delaware General Corporation Law. Persons
covered by this indemnification include any current or former directors,
officers, employees and other agents of the Company, as well as persons who
serve at the request of the Company as directors, officers, employees or agents
of another enterprise.

         In addition, the Company has entered into contractual agreements with
each director and certain officers of the Company designated by the Board to
indemnify such individuals to the full extent permitted by law. These Agreements
also resolve certain procedural and substantive matters that are not covered, or
are covered in less detail, in the Bylaws or by the Delaware General Corporation
Law.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not applicable.

ITEM 8.  EXHIBITS.

<TABLE>
<CAPTION>
     EXHIBIT
     NUMBER                         DESCRIPTION
     ------                         -----------

<S>               <C>                                                                      
          5.1     Opinion of counsel as to legality of securities being registered.

         10.1     1987 Employee Stock Purchase Plan.

         10.2     1996 Supplemental Stock Plan and form of agreement used thereunder.

         23.1     Consent of counsel (contained in Exhibit 5.1).

         23.2     Consent of KPMG Peat Marwick LLP (see page II-6).

         24.1     Power of Attorney (see page II-4).
</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 to include
any material information with respect to the plan of distribution not previously
disclosed in the Registration Statement or any material change to such 
information in the Registration Statement.

                                                        
                                      II-2
<PAGE>   4
                  (2) That, for the purpose of determining any liability under
the Securities 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.

                  (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 offering.

         (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act that is incorporated by reference in the 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
Securities Act may be permitted to directors, officers and controlling persons
of the registrant pursuant to the foregoing provisions, or otherwise, the
registrant has been advised that in the opinion of the Securities and Exchange
Commission, such indemnification is against public policy as expressed in the
Securities 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 Act and will
be governed by the final adjudication of such issue.

                                                      
                                      II-3
<PAGE>   5
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act, 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 Milpitas, State of California, on this 31st day of
January, 1997.

                                      OCTEL COMMUNICATIONS CORPORATION

                                      /s/ DEREK S. DALEY, ESQ.
                                      ---------------------------------
                                      Derek S. Daley, Esq.
                                      Vice President, Secretary and
                                       General Counsel

                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Robert Cohn and Derek S. Daley,
and each of them acting individually, as his attorney-in-fact, each with full
power of substitution, for him in any and all capacities, to sign any and all
amendments to this Registration Statement on Form S-8, and to file the same,
with exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, hereby ratifying and confirming all that
said attorney-in-fact, or his substitutes, may do or cause to be done by virtue
hereof.

                                                     
                                      II-4
<PAGE>   6
         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons on January 31,
1997 in the capacities indicated:

<TABLE>
<CAPTION>
          SIGNATURE                                       TITLE
          ---------                                       -----

<S>                                         <C> 
/s/ ROBERT COHN                             Chairman of the Board and Chief Executive
- -------------------------                   Officer (Principal Executive Officer)
(Robert Cohn)                               

/s/ W. MICHAEL WEST                         President, Chief Operating Officer and Director
- -------------------------
(W. Michael West)

/s/ JEAN-YVES DEXMIER                       Senior Vice President and Chief Financial
- -------------------------                   Officer (Principal Financial Officer and
(Jean-Yves Dexmier)                         Principal Accounting Officer)           
                                            
/s/ ANSON M. BEARD, JR.                     Director
- -------------------------
(Anson M. Beard, Jr.)

                                            Director
- -------------------------
(Leo J. Chamberlain)

/s/ DEBORAH A. COLEMAN                      Director
- -------------------------
(Deborah A. Coleman)

/s/ NATHANIEL DE ROTHSCHILD                 Director
- -------------------------
(Nathaniel de Rothschild)

/s/ JAMES A MCDIVITT                        Director
- -------------------------
(James A. McDivitt)
</TABLE>

                                      II-5
<PAGE>   7
                                                                   EXHIBIT 23.2

                         CONSENT OF INDEPENDENT AUDITORS

The Board of Directors and Stockholders
Octel Communications Corporation

We consent to incorporation by reference in the registration statement
on Form S-8 of Octel Communications Corporation and subsidiaries of our report
dated July 25, 1996, relating to the consolidated balance sheets of Octel
Communications Corporation and subsidiaries as of June 30, 1996 and 1995, and
the related consolidated statements of income, stockholders' equity, and cash
flows for each of the years in the three-year period ended June 30, 1996, and
the related financial statement schedule, which report appears in the June 30,
1996 annual report on Form 10-K of Octel Communications Corporation and
subsidiaries.

                                                       KPMG PEAT MARWICK LLP

Palo Alto, California
January 28, 1997

                                                     
                                      II-6
<PAGE>   8
                        OCTEL COMMUNICATIONS CORPORATION

                       REGISTRATION STATEMENT ON FORM S-8

                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
                                                                                                         Sequentially
     Exhibit                                                                                               Numbered
     Number                                          Description                                             Page
     ------                                          -----------                                             ----

<S>                  <C>                                                                                  <C>                     
       5.1           Opinion of counsel as to legality of securities being registered............


      10.1           1987 Employee Stock Purchase Plan ..........................................


      10.2           1996 Supplemental Stock Plan and form of agreement used
                     thereunder..................................................................

      23.1           Consent of Counsel (contained in Exhibit 5.1)...............................


      23.2           Consent of KPMG Peat Marwick LLP (see page II-6)............................


      24.1           Power of Attorney (see page II-4)...........................................
</TABLE>




                                      II-7

<PAGE>   1
                                                                     EXHIBIT 5.1

                                                   January 31, 1997

Octel Communications Corporation
1001 Murphy Ranch Road
Milpitas, CA 95035-7912

         RE:      REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-8 to be filed by
you with the Securities and Exchange Commission on or about January 31, 1997
(the "Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of 2,500,000 shares of your Common Stock
(the "Shares"), 1,500,000 of which are to be issued pursuant to the 1987
Employee Stock Purchase Plan and 1,000,000 of which are to be issued pursuant to
the 1996 Supplemental Stock Plan (together, the "Plans"). As your legal counsel,
we have examined the proceedings proposed to be taken in connection with the
issuance and sale of the Shares to be issued under the Plans.

         It is our opinion that the Shares, when issued and sold in the manner
referred to in the Plans and pursuant to the agreements which accompany the
Plans, will be legally and validly issued, fully paid and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement, including any Prospectus constituting a part thereof,
and any amendments thereto.

                                             Very truly yours,

                                             WILSON, SONSINI, GOODRICH & ROSATI
                                             Professional Corporation

MEB


<PAGE>   1
                                                                   Exhibit 10.1

                        OCTEL COMMUNICATIONS CORPORATION

                        1987 EMPLOYEE STOCK PURCHASE PLAN

                              As amended June 1996


         The following constitute the provisions of the Employee Stock Purchase
Plan of Octel Communications Corporation.

         1. PURPOSE. The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions. It is the intention
of the Company to have the Plan qualify as an "Employee Stock Purchase Plan"
under Section 423 of the Internal Revenue Code of 1986, as amended. The
provisions of the Plan shall, accordingly, be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

         2. DEFINITIONS.

                  (a) "Board" shall mean the Board of Directors of the Company.

                  (b) "Code" shall mean the Internal Revenue Code of 1986, as
amended.

                  (c) "Common Stock" shall mean the Common Stock, no par value,
of the Company.

                  (d) "Company" shall mean Octel Communications Corporation, a
Delaware corporation.

                  (e) "Compensation" shall mean all regular gross earnings,
including payments for overtime, shift premium, incentive compensation,
incentive payments, bonuses, commissions or other compensation.

                  (f) "Continuous Status as an Employee" shall mean the absence
of any interruption or termination of service as an Employee. Continuous Status
as an Employee shall not be considered interrupted in the case of a leave of
absence agreed to in writing by the Company, provided that such leave is for a
period of not more than 90 days or reemployment upon the expiration of such
leave is guaranteed by contract or statute.

                  (g) "Designated Subsidiaries" shall mean the Subsidiaries
which have been designated by the Board from time to time in its sole discretion
as eligible to participate in the Plan.

                  (h) "Employee" shall mean any person, including an officer,
who is customarily employed for at least twenty (20) hours per week and more
than five (5) months in a calendar year by the Company or one of its Designated
Subsidiaries.

                  (i) "Exercise Date" shall mean the last day of each offering
period of the Plan.

                  (j) "Offering Date" shall mean the first business day of each
offering period of the Plan, except that in the case of an individual who
becomes an eligible Employee after the first business day of an offering period
but prior to the first business day of the last calendar month of such offering
period, the term
<PAGE>   2
"Offering Date" shall mean the first business day of the calendar month
following the month in which that individual becomes an eligible Employee.

                           Options granted after the first business day of an
offering period will be subject to the same terms as the options granted on the
first business day of such offering period except that they will have a
different grant date (thus, potentially, a different exercise price) and,
because they expire at the same time as the options granted on the first
business day of such offering period, a shorter term.

                  (k) "Plan" shall mean this Employee Stock Purchase Plan.

                  (l) "Subsidiary" shall mean a corporation, domestic or
foreign, of which not less than 50% of the voting shares are held by the Company
or a Subsidiary, whether or not such corporation now exists or is hereafter
organized or acquired by the Company or a Subsidiary.

         3. ELIGIBILITY.

                  (a) Any person who is an Employee as of an Offering Date of a
given offering period shall be eligible to participate in such offering period
under the Plan, provided that such person was not eligible to participate in
such offering period as of any prior Offering Date, and further subject to the
requirements of para graph 5(a) and the limitations imposed by Section 423(b) of
the Code. Notwithstanding the foregoing sentence, any Employee who becomes an
eligible Employee in the months of July or August, 1988 may begin participation
in the Plan on September 1, 1988.

                  (b) Any provisions of the Plan to the contrary
notwithstanding, no Employee shall be granted an option under the Plan (i) if,
immediately after the grant, such Employee (or any other person whose stock
would be attributed to such Employee pursuant to Section 425(d) of the Code)
would own stock and/or hold outstanding options to purchase stock possessing
five percent (5%) or more of the total combined voting power or value of all
classes of stock of the Company or of any Subsidiary of the Company, or (ii)
which permits his rights to purchase stock under all employee stock purchase
plans (described in Section 423 of the Code) of the Company and its Subsidiaries
to accrue at a rate which exceeds Twenty-Five Thousand Dollars ($25,000) of fair
market value of such stock (determined at the time such option is granted) for
each calendar year in which such option is outstanding at any time.

         4. OFFERING PERIODS.

                  The Plan shall be implemented by one offering during each
six-month period of the Plan, commencing on or about the first day following the
end of the prior offering period, and continuing thereafter until terminated in
accordance with paragraph 19 or 23 hereof. The Board of Directors of the Company
shall have the power to change the duration of offering periods with respect to
future offerings without stockholder approval if such change is announced at
least fifteen (15) days prior to the scheduled beginning of the first offering
period to be affected.

         5. PARTICIPATION.

                  (a) An eligible Employee may become a participant in the Plan
by completing a subscription agreement authorizing payroll deduction on the form
provided by the Company and filing it with the Company's payroll office at such
time as is specified by the Company and is prior to the applicable

                                      -2-
<PAGE>   3
Offering Date (unless a later time for filing the subscription agreement is set
by the Board for all eligible Employees with respect to a given offering
period). Once properly made, an eligible Employee's election to participate
shall be automatically renewed for each subsequent offering period, subject to
any termination or withdrawal as provided in paragraph 10.

                  (b) Payroll deductions for a participant shall commence on the
first payroll following the Offering Date and shall end on the Exercise Date of
the offering period to which such authorization is applicable, unless sooner
terminated by the participant as provided in paragraph 10.

         6. PAYROLL DEDUCTIONS.

                  (a) At the time a participant files his subscription
agreement, he shall elect to have payroll deductions made on each payday during
the offering period in an amount not exceeding ten percent (10%) of the
Compensation which he receives on each payday during the offering period, and
the aggregate of such payroll deductions during the offering period shall not
exceed ten percent (10%) of his aggregate Compensation during said offering
period.

                  (b) All payroll deductions made by a participant shall be
credited to his account under the Plan. A participant may not make any
additional payments into such account.

                  (c) A participant may discontinue his participation in the
Plan as provided in paragraph 10, or may decrease (but not increase) the rate of
his payroll deductions during the offering period by completing or filing with
the Company a new authorization for payroll deduction. The change in rate shall
be effective fifteen (15) days following the Company's receipt of the new
authorization.

                  (d) Notwithstanding the foregoing, to the extent necessary to
comply with Section 423(b)(8) of the Code and paragraph 3(b) herein, a
participant's payroll deductions may be decreased to 0% at such time during any
Offering Period that the aggregate of all payroll deductions accumulated with
respect to such Offering Period and any other Offering Period ending within the
same calendar year equal $21,250. Payroll deductions shall recommence at the
rate provided in such participant's subscription agreement at the beginning of
the first Offering Period which is scheduled to end in the following calendar
year, unless terminated by the participant as provided in paragraph 11.

         7. GRANT OF OPTION.

                  (a) On each Offering Date of each offering period, each
eligible Employee beginning participation in such offering period on such
Offering Date shall be granted an option to purchase (at the per share option
price) up to a number of shares of the Company's Common Stock determined by
dividing such Employee's payroll deductions to be accumulated during such
offering period by the lower of (i) eighty-five percent (85%) of the fair market
value of a share of the Company's Common Stock on the Offering Date, or (ii)
eighty-five percent (85%) of the fair market value of a share of the Company's
Common Stock on the Exercise Date; provided that in no event shall an Employee
be permitted to purchase during any offering period more than a number of shares
determined by dividing $25,000 by the fair market value of a share of the
Company's Common Stock on the first day of such offering period, and provided
further that such purchase shall be subject to the limitations set forth in
Section 3(b) and 12 hereof. Fair market value of a share of the Company's Common
Stock shall be determined as provided in Section 7(b) herein.

                                      -3-
<PAGE>   4
                  (b) The option price per share of the shares offered in a
given offering period shall be the lower of: (i) 85% of the fair market value of
a share of the Common Stock of the Company on the Offering Date; or (ii) 85% of
the fair market value of a share of the Common Stock of the Company on the
Exercise Date. The fair market value of the Company's Common Stock on a given
date shall be determined by the Board in its discretion; provided, however, that
where there is a public market for the Common Stock, the fair market value per
Share shall be the closing sale price or, if not so reported, the mean of the
bid and asked prices of the Common Stock for such date, as reported in either
case in The Wall Street Journal (or, if not so reported, as otherwise reported
by the National Association of Securities Dealers Automated Quotation (NASDAQ)
System) or, in the event the Common Stock is listed on a stock exchange, the
fair market value per Share shall be the closing price on such exchange on such
date, as reported in The Wall Street Journal.

         8. EXERCISE OF OPTION. Unless a participant withdraws from the Plan as
provided in paragraph 10, his option for the purchase of shares will be
exercised automatically on the Exercise Date of the offering period, and the
maximum number of full shares subject to option will be purchased for him at the
applicable option price with the accumulated payroll deductions in his account.
The shares purchased upon exercise of an option hereunder shall be deemed to be
transferred to the participant on the Exercise Date. During his lifetime, a
participant's option to purchase shares hereunder is exercisable only by him.

         9. DELIVERY. As promptly as practicable after the Exercise Date of each
offering period, the Company shall arrange the delivery to each participant, as
appropriate, of a certificate representing the shares purchased upon exercise of
his option. Any cash remaining to the credit of a participant's account under
the Plan after a purchase by him of shares at the termination of each offering
period, or which is insufficient to purchase a full share of Common Stock of the
Company, shall be retained in the participant's account for the subsequent
offering period, subject to earlier withdrawal by the participant as provided in
paragraph 10.

         10. WITHDRAWAL; TERMINATION OF EMPLOYMENT.

                  (a) A participant may withdraw all but not less than all the
payroll deductions credited to his account under the Plan at any time prior to
the Exercise Date of the offering period by giving written notice to the
Company. All of the participant's payroll deductions credited to his account
will be paid to him promptly after receipt of his notice of withdrawal and his
option for the current period will be automatically terminated, and no further
payroll deductions for the purchase of shares will be made during the offering
period.

                  (b) Upon termination of the participant's Continuous Status as
an Employee prior to the Exercise Date of the offering period for any reason,
including retirement or death, the payroll deductions credited to his account
will be returned to him or, in the case of his death, to the person or persons
entitled thereto under paragraph 14, and his option will be automatically
terminated.

                  (c) In the event an Employee fails to remain in Continuous
Status as an Employee of the Company for at least twenty (20) hours per week
during the offering period in which the employee is a participant, he will be
deemed to have elected to withdraw from the Plan and the payroll deductions
credited to his account will be returned to him and his option terminated.

                  (d) A participant's withdrawal from an offering period will
not have any effect upon his eligibility to participate in a succeeding offering
period or in any similar plan which may hereafter be adopted by the Company.

                                      -4-
<PAGE>   5
         11. INTEREST. No interest shall accrue on the payroll deductions of a
participant in the Plan.

         12. STOCK.

                  (a) The maximum number of shares of the Company's Common Stock
which shall be made available for sale under the Plan shall be 5,750,000 shares,
subject to adjustment upon changes in capitalization of the Company as provided
in paragraph 18. If the total number of shares which would otherwise be subject
to options granted pursuant to Section 7(a) hereof during an offering period
exceeds the number of shares then available under the Plan (after deduction of
all shares for which options have been exercised or are then outstanding), the
Company shall make a pro rata allocation of the shares remaining available for
option grant in as uniform a manner as shall be practicable and as it shall
determine to be equitable. In such event, the Company shall give written notice
of such reduction of the number of shares subject to the option to each Employee
affected thereby and shall similarly reduce the rate of payroll deductions, if
necessary.

                  (b) The participant will have no interest or voting right in
shares covered by his option until such option has been exercised.

                  (c) Shares to be delivered to a participant under the Plan
will be registered in the name of the participant or jointly (with right of
survivorship) in the name of the participant and another person, such as his
spouse, whom the participant designates.

         13. ADMINISTRATION. The Plan shall be administered by the Board of the
Company or a committee of members of the Board appointed by the Board. The
administration, interpretation or application of the Plan by the Board or its
committee shall be final, conclusive and binding upon all participants. Members
of the Board who are eligible Employees are permitted to participate in the
Plan, provided that:

                  (a) Members of the Board who are eligible to participate in
the Plan may not vote on any matter affecting the administration of the Plan or
the grant of any option pursuant to the Plan.

                  (b) If a Committee is established to administer the Plan, no
member of the Board who is eligible to participate in the Plan may be a member
of the Committee.

         14. DESIGNATION OF BENEFICIARY.

                  (a) A participant may file a written designation of a
beneficiary who is to receive any shares and cash, if any, from the
participant's account under the Plan in the event of such participant's death
subsequent to the end of the offering period but prior to delivery to him of
such shares and cash. In addition, a participant may file a written designation
of a beneficiary who is to receive any cash from the participant's account under
the Plan in the event of such participant's death prior to the Exercise Date of
the offering period.

                  (b) Such designation of beneficiary may be changed by the
participant at any time by written notice. In the event of the death of a
participant and in the absence of a beneficiary validly designated under the
Plan who is living at the time of such participant's death, the Company shall
deliver such shares and/or cash to the executor or administrator of the estate
of the participant, or if no such executor or administrator has been appointed
(to the knowledge of the Company), the Company, in its discretion, may 

                                      -5-
<PAGE>   6
deliver such shares and/or cash to the spouse or to any one or more dependents
or relatives of the participant, or if no spouse, dependent or relative is known
to the Company, then to such other person as the Company may designate.

         15. TRANSFERABILITY. Neither payroll deductions credited to a
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in paragraph 14 hereof) by the participant. Any such
attempt at assignment, transfer, pledge or other disposition shall be without
effect, except that the Company may treat such act as an election to withdraw
funds in accordance with paragraph 10.

         16. USE OF FUNDS. All payroll deductions received or held by the
Company under the Plan may be used by the Company for any corporate purpose, and
the Company shall not be obligated to segregate such payroll deductions.

         17. REPORTS. Individual accounts will be maintained for each
participant in the Plan. Statements of account will be given to participating
Employees promptly following the Exercise Date, which statements will set forth
the amounts of payroll deductions, the per share purchase price, the number of
shares purchased and the remaining cash balance, if any.

         18. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION. Subject to any required
action by the stockholders of the Company, the number of shares of Common Stock
covered by each option under the Plan which has not yet been exercised and the
number of shares of Common Stock which have been authorized for issuance under
the Plan but have not yet been placed under option (collectively, the
"Reserves"), as well as the price per share of Common Stock covered by each
option under the Plan which has not yet been exercised, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of shares of Common Stock effected without receipt of
consideration by the Company; 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 Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issue 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 thereof shall be made with respect to, the
number or price of shares of Common Stock subject to an option.

         In the event of the proposed dissolution or liquidation of the Company,
the offering period will terminate immediately prior to the consummation of such
proposed action, unless otherwise provided by the Board. The Board may, in the
exercise of its sole discretion in such instances, declare that any offering
period shall terminate as of a date fixed by the Board and give each Plan
participant the right to exercise his option as to all or any part of the shares
subject to option thereunder, including shares as to which the option would not
otherwise be exercisable. In the event of a proposed sale of all or
substantially all of the assets of the Company, or the merger of the Company
with or into another corporation, each option under the Plan shall be assumed or
an equivalent option shall be substituted by such successor corporation or a
parent or subsidiary of such successor corporation. In the event that such
successor corporation refuses to assume the option or to substitute an
equivalent option, the Board shall, in lieu of such assumption or substitution,
provide for the Plan participant to have the right to exercise the option as to
all of the shares subject to option thereunder, including shares as to which the
option would not otherwise be exercisable. If the Board makes an option fully

                                      -6-
<PAGE>   7
exercisable in lieu of assumption or substitution in the event of a merger or
sale of assets, the Board shall notify the Plan participant that the option
shall be fully exercisable for a period of thirty (30) days from the date of
such notice, and the option will terminate upon the expiration of such period.

         The Board may, if it so determines in the exercise of its sole
discretion, also make provision for adjusting the Reserves, as well as the price
per share of Common Stock covered by each outstanding option, in the event that
the Company effects one or more reorganizations, recapitalizations, rights
offerings or other increases or reductions of shares of its outstanding Common
Stock, and in the event of the Company being consolidated with or merged into
any other corporation.

         19. AMENDMENT AND TERMINATION. The Board may at any time amend, alter,
suspend or discontinue the Plan, but, except as provided in paragraph 18, no
amendment, alteration, suspension or discontinuation shall be made which would
impair the rights of any participant arising out of any offering period which
has already commenced without his or her written consent. In addition, to the
extent necessary and desirable to comply with Rule 16b-3 under the Exchange Act
or with Section 423 of the Code (or any other appli cable law or regulation,
including the requirements of the NASD or an established stock exchange), the
Company shall obtain stockholder approval of any Plan amendment in such a manner
and to such a degree as required.

         20. NOTICES. All notices or other communications by a participant to
the Company under or in connection with the Plan shall be deemed to have been
duly given when received in the form specified by the Company at the location,
or by the person, designated by the Company for the receipt thereof.

         21. STOCKHOLDER APPROVAL.

                  (a) Continuance of the Plan shall be subject to approval by
the stockholders of the Company within twelve (12) months before or after the
date the Plan is adopted. If such stockholder approval is obtained at a duly
held stockholders' meeting, it must be obtained by the affirmative vote of the
holders of a majority of the outstanding shares of the Company, or if such
stockholder approval is obtained by written consent, it must be obtained by the
unanimous written consent of all stockholders of the Company; provided, however,
that approval at a meeting or by written consent may be obtained by a lesser
degree of stockholder approval if the Board determines, in its discretion after
consultation with the Company's legal counsel, that such a lesser degree of
stockholder approval will comply with all applicable laws and will not adversely
affect the qualification of the Plan under Section 423 of the Code.*

                  (b) If and in the event that the Company registers any class
of equity securities pursuant to Section 12 of the Exchange Act, any required
approval of the stockholders of the Company obtained after such registration
shall be solicited substantially in accordance with Section 14(a) of the
Exchange Act and the rules and regulations promulgated thereunder.

                  (c) If any required approval by the stockholders of the Plan
itself or of any amendment thereto is solicited at any time otherwise than in
the manner described in paragraph 21(b) hereof, then the Company shall, at or
prior to the first annual meeting of stockholders held subsequent to the later
of (1) the 

- --------
*    The Plan was approved at a duly held Shareholder's meeting in November of
     1987.

                                      -7-
<PAGE>   8
first registration of any class of equity securities of the Company
under Section 12 of the Exchange Act or (2) the granting of an option hereunder
to an officer or director after such registration, do the following:

                             (i) furnish in writing to the holders entitled to
vote for the Plan substantially the same information which would be required (if
proxies to be voted with respect to approval or disapproval of the Plan or
amendment were then being solicited) by the rules and regulations in effect
under Section 14(a) of the Exchange Act at the time such information is
furnished; and

                             (ii) file with, or mail for filing to, the
Securities and Exchange Commission four copies of the written information
referred to in subsection (i) hereof not later than the date on which such
information is first sent or given to stockholders.

         22. CONDITIONS UPON ISSUANCE OF SHARES. Shares shall not be issued with
respect to an option unless the exercise of such option and the issuance and
delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

         As a condition to the exercise of an option, the Company may require
the person exercising such option 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 of
the aforementioned applicable provisions of law.

         23. TERM OF PLAN. The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
stockholders of the Company as described in paragraph 21. It shall continue in
effect for a term of twenty (20) years unless sooner terminated under paragraph
19.

                                       -8-
<PAGE>   9
                        OCTEL COMMUNICATIONS CORPORATION

                          EMPLOYEE STOCK PURCHASE PLAN
                                 ENROLLMENT FORM



Date of enrollment:        _________________

1.       I, ________________________, hereby elect to participate in the Octel
         Communications Corporation 1987 Employee Stock Purchase Plan (the
         "Stock Purchase Plan") and subscribe to purchase shares of the
         Company's Common Stock, without par value, in accordance with this
         enrollment form and the Stock Purchase Plan.

2.       I hereby authorize the Company to deduct from each paycheck ____% of my
         GROSS PAY for each payday during this Offering Period, and each
         subsequent offering period during which I am eligible to participate,
         in accordance with the provisions of the Stock Purchase Plan. I also
         understand that this calculated amount will be deducted from my NET
         PAY, or after all payroll taxes.

3.       I understand that said payroll deductions shall be accumulated for the
         purchase of shares of Common Stock, without par value, at the
         applicable purchase price determined in accordance with the Stock
         Purchase Plan. I further understand that, except as otherwise set forth
         in the Stock Purchase Plan, unless I withdraw from the Stock Purchase
         Plan by giving written notice to the Company, shares will be purchased
         for me automatically on the Exercise Date of each offering period
         subsequent to my filing of this enrollment form.

4.       I understand that, before the Exercise Date for this Offering Period,
         the Company will provide me with a copy of the Company's most recent
         prospectus describing the 1987 Employee Stock Purchase Plan, and
         thereafter will provide me with annual updates and copies of any
         revised versions of the prospectus. Therefore, before my options
         received under the Plan are exercised to purchase Shares, I will have
         the opportunity (after receiving the prospectus and before the Exercise
         Date) to withdraw from the Plan and have returned to me all the money
         that was deducted from my pay for the purpose of purchasing shares. I
         acknowledge that I have received a copy of the complete "Octel
         Communications Corporation 1987 Employee Stock Purchase Plan." I
         understand that my participation in the Stock Purchase Plan is in all
         respects subject to the terms of the Plan.
<PAGE>   10
5.       Shares purchased for me under the Stock Purchase Plan should be issued
         in the name(s) of:

         Your name   _________________________________________________
                     As you wish it to appear on the stock certificate

         and

         Other*     _________________________________________________
                    As you wish it to appear on the stock certificate


* Please Note: If you wish for another person's name to appear on the stock
certificate in addition to you own, YOU MUST CHECK OFF ONE OF THE SELECTIONS
BELOW to specify the type of ownership. This selection will be indicated on your
stock certificate.

_____    TENANTS IN COMMON - Abbreviated as "TEN COM," may be specified to
         identify two or more owners.

_____    JOINT TENANCY WITH RIGHT OF SURVIVORSHIP AND NOT AS TENANTS IN COMMON -
         Abbreviated as "JT TEN," may be specified to identify two or more joint
         owners.

_____    TENANTS BY THE ENTIRETIES - Abbreviated as "TEN ENT," (not appropriate
         for California residents) may be specified for ownership by husband and
         wife.

_____    COMMUNITY PROPERTY - If specified, will not be abbreviated.

6.       I understand that if I dispose of any shares received by me pursuant to
         the Plan, either (1) within 2 years after the Offering Date (the first
         day of the offering period during which I purchased such shares) or (2)
         within 1 year after the date on which such shares were transferred to
         me, I will be treated for federal income tax purposes as having
         received ordinary income at the time of such disposition in an amount
         equal to the excess of the fair market value of the shares at the time
         such shares were transferred to me over the price which I paid for the
         shares.

         I HEREBY AGREE TO NOTIFY THE COMPANY IN WRITING WITHIN 30 DAYS AFTER
         THE DATE OF ANY SUCH DISPOSITION.

         However, if I dispose of such shares at any time after the expiration
         of the 2-year and 1-year holding periods, I understand that I will be
         treated for federal income tax purposes as having received income only
         at the time of such disposition, and that such income will be treated
         as ordinary income only to the extent of an amount equal to the lesser
         of (1) the excess of the fair market value of the shares at the time of
         such disposition over the purchase price which I paid for the shares
         under the option, or (2) the excess of the fair market value of the
         shares over the option price, measured as if the option had been
         exercised on the Offering Date. The remainder of the gain or loss, if
         any, recognized on such disposition will be treated as capital gain or
         loss. The federal income tax treatment of ordinary income and capital
         gain and loss is described in the Company's prospectus relating to the
         Stock Purchase Plan.

                                      -2-
<PAGE>   11
7.       I hereby agree to be bound by the terms of the Stock Purchase Plan. I
         understand that my enrollment is dependent upon my eligibility to
         participate in the Stock Purchase Plan.

8.       I FURTHER ACKNOWLEDGE AND UNDERSTAND THAT THE COMPANY'S OBLIGATION TO
         SELL SHARES TO ME IS CONDITIONAL UPON COMPLIANCE WITH ALL APPLICABLE
         FEDERAL AND STATE SECURITIES LAWS, AND SPECIFICALLY CONDITIONAL UPON
         THE EXISTENCE OF AN EFFECTIVE REGISTRATION STATEMENT REGARDING THE
         SHARES WHICH I WILL PURCHASE ON THE DATE OF THAT PURCHASE.

9.       In the event of my death, I hereby designate the following as my
         beneficiary(ies) to receive all payments and shares due me under the
         Stock Purchase Plan:

NAME:  (Please print)_________________________________________________________
                                      (First)         (Middle)          (Last)

- --------------------------                 ------------------------------------
Relationship
                                           ------------------------------------
                                           (Address)

NAME:  (Please print)_________________________________________________________
                              (First)         (Middle)               (Last)

- --------------------------                 ------------------------------------
Relationship
                                           ------------------------------------
                                          (Address)

NAME:  (Please print)_________________________________________________________
                                      (First)         (Middle)          (Last)

- --------------------------                 ------------------------------------
Relationship
                                           ------------------------------------
                                          (Address)

NAME:  (Please print)_________________________________________________________
                               (First)         (Middle)               (Last)

- --------------------------                 ------------------------------------
Relationship
                                           ------------------------------------
                                           (Address)
         Note: You may use the back side of this form to list any additional
beneficiary(ies) than those above or attach a list of your own.


Dated:____________      __________________________     ________________________

                                      -3-

<PAGE>   12
                         Signature of Employee           Print Name

  






                                      -4-

<PAGE>   1
                                                                Exhibit 10.2


                        OCTEL COMMUNICATIONS CORPORATION
                          1996 SUPPLEMENTAL STOCK PLAN


         1. PURPOSES OF THE PLAN. The purposes of this Supplemental Stock Plan
are:

               -       to attract and retain the best available personnel for
                       positions of substantial responsibility,

               -       to provide additional incentive to Employees, Directors
                       and Consultants, and

               -       to promote the success of the Company's business.

        Options granted under the Plan will be Nonstatutory Stock Options.

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

               (a) "ADMINISTRATOR" means the Board or any of its Committees as
shall be administering the Plan, in accordance with Section 4 of the Plan.

               (b) "APPLICABLE LAWS" means the requirements relating to the
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Options are, or will be, granted under
the Plan.

               (c) "BOARD" means the Board of Directors of the Company.

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

               (e) "COMMITTEE" means a committee of Directors appointed by the
Board in accordance with Section 4 of the Plan.

               (f) "COMMON STOCK" means the Common Stock of the Company.

               (g) "COMPANY" means Octel Communications Corporation, a Delaware
corporation.

               (h) "CONSULTANT" means any person, including an advisor, engaged
by the Company or a Parent or Subsidiary to render services to such entity.

               (i) "DIRECTOR" means a member of the Board.

               (j) "DISABILITY" means total and permanent disability as defined
in Section 22(e)(3) of the Code.
<PAGE>   2
               (k) "EMPLOYEE" means any person, including Officers, employed by
the Company or any Parent or Subsidiary of the Company. A Service Provider shall
not cease to be an Employee in the case of (i) any leave of absence approved by
the Company or (ii) transfers between locations of the Company or between the
Company, its Parent, any Subsidiary, or any successor. Neither service as a
Director nor payment of a director's fee by the Company shall be sufficient to
constitute "employment" by the Company.

               (l) "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

               (m) "FAIR MARKET VALUE" means, as of any date, the value of
Common Stock determined as follows:

                       (i) If the Common Stock is listed on any established
stock exchange or a national market system, including without limitation the
Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market,
its Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the date of determination or the last market trading day prior to the date of
determination, if such date is not a market trading day, as reported in The Wall
Street Journal or such other source as the Administrator deems reliable;

                       (ii) If the Common Stock is regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a Share of Common Stock shall be the mean between the high bid
and low asked prices for the Common Stock on the date of determination or the
last market trading day prior to the date of determination, if such date is not
a market trading day, as reported in The Wall Street Journal or such other
source as the Administrator deems reliable;

                       (iii) In the absence of an established market for the
Common Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

               (n) "NOTICE OF GRANT" means a written or electronic notice
evidencing certain terms and conditions of an individual Option grant. The
Notice of Grant is part of the Option Agreement.

               (o) "OFFICER" means a person who is an officer of the Company
within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

               (p) "OPTION" means a nonstatutory stock option granted pursuant
to the Plan, that is not intended to qualify as an incentive stock option within
the meaning of Section 422 of the Code and the regulations promulgated
thereunder.

               (q) "OPTION AGREEMENT" means an agreement between the Company and
an Optionee evidencing the terms and conditions of an individual Option grant.
The Option Agreement is subject to the terms and conditions of the Plan.

                                       -2-
<PAGE>   3
               (r) "OPTION EXCHANGE PROGRAM" means a program whereby outstanding
options are surrendered in exchange for options with a lower exercise price.

               (s) "OPTIONED STOCK" means the Common Stock subject to an Option.

               (t) "OPTIONEE" means the holder of an outstanding Option granted
under the Plan.

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

               (v) "PLAN" means this 1996 Supplemental Stock Plan.

               (w) "SERVICE PROVIDER" means an Employee, Consultant or Director.

               (x) "SHARE" means a share of the Common Stock, as adjusted in
accordance with Section 12 of the Plan.

               (y) "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. Subject to the provisions of Section 12 of
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 1,000,000 Shares. The Shares may be authorized, but unissued,
or reacquired Common Stock.

               If an Option expires or becomes unexercisable without having been
exercised in full, or is surrendered pursuant to an Option Exchange Program, the
unpurchased Shares which were subject thereto shall become available for future
grant or sale under the Plan (unless the Plan has terminated).

        4. ADMINISTRATION OF THE PLAN.

               (a) The Plan shall be administered by (A) the Board or (B) a
Committee, which committee shall be constituted to satisfy Applicable Laws.

               (b) Powers of the Administrator. Subject to the provisions of the
Plan, and in the case of a Committee, subject to the specific duties delegated
by the Board to such Committee, the Administrator shall have the authority, in
its discretion:

                       (i) to determine the Fair Market Value of the Common
Stock;

                       (ii) to select the Service Providers to whom Options may
be granted hereunder;

                       (iii) to determine whether and to what extent Options are
granted hereunder;

                                       -3-
<PAGE>   4
                       (iv) to determine the number of shares of Common Stock to
be covered by each Option granted hereunder;

                       (v) to approve forms of agreement for use under the Plan;

                       (vi) to determine the terms and conditions, not
inconsistent with the terms of the Plan, of any award granted hereunder. Such
terms and conditions include, but are not limited to, the exercise price, the
time or times when Options may be exercised (which may be based on performance
criteria), any vesting acceleration or waiver of forfeiture restrictions, and
any restriction or limitation regarding any Option or the shares of Common Stock
relating thereto, based in each case on such factors as the Administrator, in
its sole discretion, shall determine;

                       (vii) to reduce the exercise price of any Option to the
then current Fair Market Value if the Fair Market Value of the Common Stock
covered by such Option shall have declined since the date the Option was
granted;

                       (viii) to institute an Option Exchange Program;

                       (ix) to construe and interpret the terms of the Plan and
awards granted pursuant to the Plan;

                       (x) to prescribe, amend and rescind rules and regulations
relating to the Plan, including rules and regulations relating to sub-plans
established for the purpose of qualifying for preferred tax treatment under
foreign tax laws;

                       (xi) to modify or amend each Option (subject to Section
14(b) of the Plan), including the discretionary authority to extend the
post-termination exercisability period of Options longer than is otherwise
provided for in the Plan;

                       (xii) to authorize any person to execute on behalf of the
Company any instrument required to effect the grant of an Option or the
amendment of an Option previously granted by the Administrator;

                       (xiii) to determine the terms and restrictions applicable
to Options;

                       (xiv) to allow Optionees to satisfy withholding tax
obligations by electing to have the Company withhold from the Shares to be
issued upon exercise of an Option that number of Shares having a Fair Market
Value equal to the amount required to be withheld. The Fair Market Value of the
Shares to be withheld shall be determined on the date that the amount of tax to
be withheld is to be determined. All elections by an Optionee to have Shares
withheld for this purpose shall be made in such form and under such conditions
as the Administrator may deem necessary or advisable; and

                                       -4-
<PAGE>   5
                       (xv) to make all other determinations deemed necessary or
advisable for administering the Plan.

               (c) Effect of Administrator's Decision. The Administrator's
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options.

        5. ELIGIBILITY. Options may be granted to Service Providers; provided,
however, that notwithstanding anything to the contrary contained in the Plan,
Options may not be granted to Officers and Directors.

        6. LIMITATION. Neither the Plan nor any Option shall confer upon an
Optionee any right with respect to continuing the Optionee's relationship as a
Service Provider with the Company, nor shall they interfere in any way with the
Optionee's right or the Company's right to terminate such relationship at any
time, with or without cause.

        7. TERM OF PLAN. The Plan shall become effective upon its adoption by
the Board. It shall continue in effect for ten (10) years, unless sooner
terminated under Section 14 of the Plan.

        8. TERM OF OPTION. The term of each Option shall be stated in the Option
Agreement.

        9. OPTION EXERCISE PRICE AND CONSIDERATION.

               (a) Exercise Price. The per share exercise price for the Shares
to be issued pursuant to exercise of an Option shall be determined by the
Administrator.

               (b) Waiting Period and Exercise Dates. At the time an Option is
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions which must be satisfied before the
Option may be exercised.

               (c) Form of Consideration. The Administrator shall determine the
acceptable form of consideration for exercising an Option, including the method
of payment. Such consideration may consist entirely of:

                       (i) cash;

                       (ii) check;

                       (iii) promissory note;

                       (iv) other Shares which (A) in the case of Shares
acquired upon exercise of an option, have been owned by the Optionee for more
than six months on the date of surrender, and (B) have a Fair Market Value on
the date of surrender equal to the aggregate exercise price of the Shares as to
which said Option shall be exercised;

                                       -5-
<PAGE>   6
                       (v) consideration received by the Company under a
cashless exercise program implemented by the Company in connection with the
Plan;

                       (vi) a reduction in the amount of any Company liability
to the Optionee, including any liability attributable to the Optionee's
participation in any Company-sponsored deferred compensation program or
arrangement;

                       (vii) such other consideration and method of payment for
the issuance of Shares to the extent permitted by Applicable Laws; or

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

        10. EXERCISE OF OPTION.

               (a) Procedure for Exercise; Rights as a Stockholder. Any Option
granted hereunder shall be exercisable according to the terms of the Plan and at
such times and under such conditions as determined by the Administrator and set
forth in the Option Agreement. An Option may not be exercised for a fraction of
a Share.

                       An Option shall be deemed exercised when the Company
receives: (i) written or electronic notice of exercise (in accordance with the
Option Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised. Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan. Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised. No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 13 of the Plan.

                       Exercising an Option in any manner shall decrease the
number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

               (b) Termination of Relationship as a Service Provider. If an
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option, but only within such
period of time as is specified in the Option Agreement, and only to the extent
that the Option is vested on the date of termination (but in no event later than
the expiration of the term of such Option as set forth in the Option Agreement).
In the absence of a specified time in the Option Agreement, the Option shall
remain exercisable for three (3) months following the Optionee's termination.
If, on the date of termination, the Optionee is not vested as to

                                       -6-
<PAGE>   7
his or her entire Option, the Shares covered by the unvested portion of the
Option shall revert to the Plan. If, after termination, the Optionee does not
exercise his or her Option within the time specified by the Administrator, the
Option shall terminate, and the Shares covered by such Option shall revert to
the Plan.

               (c) Disability of Optionee. If an Optionee ceases to be a Service
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option
Agreement, to the extent the Option is vested on the date of termination (but in
no event later than the expiration of the term of such Option as set forth in
the Option Agreement). In the absence of a specified time in the Option
Agreement, the Option shall remain exercisable for twelve (12) months following
the Optionee's termination. If, on the date of termination, the Optionee is not
vested as to his or her entire Option, the Shares covered by the unvested
portion of the Option shall revert to the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified herein,
the Option shall terminate, and the Shares covered by such Option shall revert
to the Plan.

               (d) Death of Optionee. If an Optionee dies while a Service
Provider, the Option may be exercised within such period of time as is specified
in the Option Agreement (but in no event later than the expiration of the term
of such Option as set forth in the Notice of Grant), by the Optionee's estate or
by a person who acquires the right to exercise the Option by bequest or
inheritance, but only to the extent that the Option is vested on the date of
death. In the absence of a specified time in the Option Agreement, the Option
shall remain exercisable for twelve (12) months following the Optionee's
termination. If, at the time of death, the Optionee is not vested as to his or
her entire Option, the Shares covered by the unvested portion of the Option
shall immediately revert to the Plan. The Option may be exercised by the
executor or administrator of the Optionee's estate or, if none, by the person(s)
entitled to exercise the Option under the Optionee's will or the laws of descent
or distribution. If the Option is not so exercised within the time specified
herein, the Option shall terminate, and the Shares covered by such Option shall
revert to the Plan.

               (e) Buyout Provisions. The Administrator may at any time offer to
buy out for a payment in cash or Shares, an Option previously granted based on
such terms and conditions as the Administrator shall establish and communicate
to the Optionee at the time that such offer is made.

        11. NON-TRANSFERABILITY OF OPTIONS. Unless determined otherwise by the
Administrator, an Option 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
Optionee, only by the Optionee. If the Administrator makes an Option
transferable, such Option shall contain such additional terms and conditions as
the Administrator deems appropriate.

        12. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION, MERGER OR
ASSET SALE.

               (a) Changes in Capitalization. Subject to any required action by
the stockholders of the Company, the number of shares of Common Stock covered by
each outstanding Option, and the number of shares of Common Stock which have
been authorized for issuance under the Plan but as to

                                       -7-
<PAGE>   8
which no Options have yet been granted or which have been returned to the Plan
upon cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding Option, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; 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 Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, 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 thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

               (b) Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable. In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated. To the extent it has not been previously exercised, an
Option will terminate immediately prior to the consummation of such proposed
action.

               (c) Merger or Asset Sale. In the event of a merger of the Company
with or into another corporation, or the sale of substantially all of the assets
of the Company, each outstanding Option shall be assumed or an equivalent option
or right substituted by the successor corporation or a Parent or Subsidiary of
the successor corporation. In the event that the successor corporation refuses
to assume or substitute for the Option, the Optionee shall fully vest in and
have the right to exercise the Option as to all of the Optioned Stock, including
Shares as to which it would not otherwise be vested or exercisable. If an Option
becomes fully vested and exercisable in lieu of assumption or substitution in
the event of a merger or sale of assets, the Administrator shall notify the
Optionee in writing or electronically that the Option shall be fully vested and
exercisable for a period of fifteen (15) days from the date of such notice, and
the Option shall terminate upon the expiration of such period. For the purposes
of this paragraph, the Option shall be considered assumed if, following the
merger or sale of assets, the option or right confers the right to purchase or
receive, for each Share of Optioned Stock, immediately prior to the merger or
sale of assets, the consideration (whether stock, cash, or other securities or
property) received in the merger or sale of assets by holders of Common Stock
for each Share held on the effective date of the transaction (and if holders
were offered a choice of consideration, the type of consideration chosen by the
holders of a majority of the outstanding Shares); provided, however, that if
such consideration received in the merger or sale of assets is not solely common
stock of the successor corporation or its Parent, the Administrator may, with
the consent of the successor corporation, provide for the consideration to be
received upon the exercise of the Option, for each Share of Optioned Stock to be
solely common stock of the successor

                                       -8-
<PAGE>   9
corporation or its Parent equal in fair market value to the per share
consideration received by holders of Common Stock in the merger or sale of
assets.

        13. DATE OF GRANT. The date of grant of an Option shall be, for all
purposes, the date on which the Administrator makes the determination granting
such Option, or such other later date as is determined by the Administrator.
Notice of the determination shall be provided to each Optionee within a
reasonable time after the date of such grant.

        14. AMENDMENT AND TERMINATION OF THE PLAN.

               (a) Amendment and Termination. The Board may at any time amend,
alter, suspend or terminate the Plan.

               (b) Effect of Amendment or Termination. No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to options granted under the
Plan prior to the date of such termination.

        15. CONDITIONS UPON ISSUANCE OF SHARES.

               (a) Legal Compliance. Shares shall not be issued pursuant to the
exercise of an Option unless the exercise of such Option and the issuance and
delivery of such Shares shall comply with Applicable Laws and shall be further
subject to the approval of counsel for the Company with respect to such
compliance, if in the opinion of the Administrator such approval is necessary to
ensure compliance.

               (b) Investment Representations. As a condition to the exercise of
an Option the Company may require the person exercising such Option 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.

        16. INABILITY TO OBTAIN AUTHORITY. 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.

        17. RESERVATION OF SHARES. The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

                                       -9-
<PAGE>   10
                          1996 SUPPLEMENTAL STOCK PLAN

                             STOCK OPTION AGREEMENT


        Unless otherwise defined herein, the terms defined in the Plan shall
have the same defined meanings in this Option Agreement.

I.  NOTICE OF STOCK OPTION GRANT

[Optionee's Name and Address]

        You have been granted an option to purchase Common Stock of the Company,
subject to the terms and conditions of the Plan and this Option Agreement, as
follows:

        Grant Number                                 __________________________

        Date of Grant                                __________________________

        Vesting Commencement Date                    __________________________

        Exercise Price per Share                     $_________________________

        Total Number of Shares Granted               __________________________

        Type of Option:                              Nonstatutory Stock Option

        Term/Expiration Date:                        Five years and six months 
                                                     from Date of Grant

        VESTING SCHEDULE:

        Subject to the Optionee continuing to be a Service Provider on such
dates, this Option shall vest and become exercisable in accordance with the
following schedule:

        25% of the Shares subject to the Option shall vest twelve months after
the Vesting Commencement Date, and 25% of the Shares subject to the Option each
twelve months thereafter.
<PAGE>   11
        TERMINATION PERIOD:

        This Option may be exercised for three months after Optionee ceases to
be a Service Provider. Upon the death or Disability of the Optionee, this Option
may be exercised for six months after Optionee ceases to be a Service Provider.
In no event shall this Option be exercised later than the Term/Expiration Date
as provided above.

II.  AGREEMENT

        1. GRANT OF OPTION. The Plan Administrator of the Company hereby grants
to the Optionee named in the Notice of Grant attached as Part I of this
Agreement (the "Optionee") an option (the "Option") to purchase the number of
Shares, as set forth in the Notice of Grant, at the exercise price per share set
forth in the Notice of Grant (the "Exercise Price"), subject to the terms and
conditions of the Plan, which is incorporated herein by reference. Subject to
Section 14(b) of the Plan, in the event of a conflict between the terms and
conditions of the Plan and the terms and conditions of this Option Agreement,
the terms and conditions of the Plan shall prevail.

        2. EXERCISE OF OPTION.

               (a) Right to Exercise. This Option is exercisable during its term
in accordance with the Vesting Schedule set out in the Notice of Grant and the
applicable provisions of the Plan and this Option Agreement.

               (b) Method of Exercise. This Option is exercisable by delivery of
an exercise notice, in the form attached as Exhibit A (the "Exercise Notice"),
which shall state the election to exercise the Option, the number of Shares in
respect of which the Option is being exercised (the "Exercised Shares"), and
such other representations and agreements as may be required by the Company
pursuant to the provisions of the Plan. The Exercise Notice shall be completed
by the Optionee and delivered to the Company's stock administrator. The Exercise
Notice shall be accompanied by payment of the aggregate Exercise Price as to all
Exercised Shares. This Option shall be deemed to be exercised upon receipt by
the Company of such fully executed Exercise Notice accompanied by such aggregate
Exercise Price.

               No Shares shall be issued pursuant to the exercise of this Option
unless such issuance and exercise complies with Applicable Laws. Assuming such
compliance, for income tax purposes the Exercised Shares shall be considered
transferred to the Optionee on the date the Option is exercised with respect to
such Exercised Shares.

        3. METHOD OF PAYMENT. Payment of the aggregate Exercise Price shall be
by any of the following, or a combination thereof, at the election of the
Optionee:

               (a) cash; or

               (b) check; or

                                       -2-
<PAGE>   12
               (c) check; or

               (d) consideration received by the Company under a cashless
exercise program implemented by the Company in connection with the Plan; or

               (e) surrender of other Shares which (i) in the case of Shares
acquired upon exercise of an option, have been owned by the Optionee for more
than six (6) months on the date of surrender, AND (ii) have a Fair Market Value
on the date of surrender equal to the aggregate Exercise Price of the Exercised
Shares.

        4. NON-TRANSFERABILITY OF OPTION. This Option may not be transferred in
any manner otherwise than by will or by the laws of descent or distribution and
may be exercised during the lifetime of Optionee only by the Optionee. The terms
of the Plan and this Option Agreement shall be binding upon the executors,
administrators, heirs, successors and assigns of the Optionee.

        5. TERM OF OPTION. This Option may be exercised only within the term set
out in the Notice of Grant, and may be exercised during such term only in
accordance with the Plan and the terms of this Option Agreement.

        6. TAX CONSEQUENCES. Some of the federal tax consequences relating to
this Option, as of the date of this Option, are set forth below. THIS SUMMARY IS
NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE.
THE OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR
DISPOSING OF THE SHARES.

               (a) Exercising the Option. The Optionee may incur regular federal
income tax liability upon exercise of a Nonstatutory Stock Option. The Optionee
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
Exercised Shares on the date of exercise over their aggregate Exercise Price. If
the Optionee is an Employee or a former Employee, the Company will be required
to withhold from his or her compensation or collect from Optionee 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.

               (b) Disposition of Shares. If the Optionee holds Nonstatutory
Stock Option Shares for at least one year, any gain realized on disposition of
the Shares will be treated as long-term capital gain for federal income tax
purposes.

        7. ENTIRE AGREEMENT; GOVERNING LAW. The Plan is incorporated herein by
reference. 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 Optionee with
respect to the subject matter hereof, and may not be modified adversely

                                       -3-
<PAGE>   13
to the Optionee's interest except by means of a writing signed by the Company
and Optionee. This agreement is governed by the internal substantive laws, but
not the choice of law rules, of Delaware.

        8. NO GUARANTEE OF CONTINUED SERVICE. OPTIONEE ACKNOWLEDGES AND AGREES
THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED
ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (AND NOT
THROUGH THE ACT OF BEING HIRED, BEING GRANTED AN OPTION OR PURCHASING SHARES
HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE
TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO
NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A
SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL
NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE COMPANY'S RIGHT TO TERMINATE
OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT
CAUSE.

        By your signature and the signature of the Company's representative
below, you and the Company agree that this Option is granted under and governed
by the terms and conditions of the Plan and this Option Agreement. Optionee has
reviewed the Plan and this Option Agreement in their entirety, has had an
opportunity to obtain the advice of counsel prior to executing this Option
Agreement and fully understands all provisions of the Plan and Option Agreement.
Optionee hereby agrees to accept as binding, conclusive and final all decisions
or interpretations of the Administrator upon any questions relating to the Plan
and Option Agreement. Optionee further agrees to notify the Company upon any
change in the residence address indicated below.


OPTIONEE:                                OCTEL COMMUNICATIONS
                                         CORPORATION



- ------------------------------------     --------------------------------------
Signature                                By

- ------------------------------------     --------------------------------------
Print Name                               Title

- ------------------------------------
Residence Address

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

                                       -4-
<PAGE>   14
                                    EXHIBIT A

                          1996 SUPPLEMENTAL STOCK PLAN

                                 EXERCISE NOTICE


Octel Communications Corporation
1001 Murphy Ranch Road
Milpitas, CA  95035

Attention: Stock Administrator

        1. EXERCISE OF OPTION. Effective as of today, ________________, 199__,
the undersigned ("Purchaser") hereby elects to purchase ______________ shares
(the "Shares") of the Common Stock of Octel Communications Corporation (the
"Company") under and pursuant to the 1996 Supplemental Stock Plan (the "Plan")
and the Stock Option Agreement dated          , 19___ (the "Option Agreement").
The purchase price for the Shares shall be $ , as required by the Option 
Agreement.

        2. DELIVERY OF PAYMENT. Purchaser herewith delivers to the Company the
full purchase price for the Shares.

        3. REPRESENTATIONS OF PURCHASER. Purchaser acknowledges that Purchaser
has received, read and understood the Plan and the Option Agreement and agrees
to abide by and be bound by their terms and conditions.

        4. RIGHTS AS STOCKHOLDER. 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 Shares, no right to vote or receive dividends or
any other rights as a stockholder shall exist with respect to the Optioned
Stock, notwithstanding the exercise of the Option. The Shares so acquired shall
be issued to the Optionee as soon as practicable after exercise of the Option.
No adjustment will be made for a dividend or other right for which the record
date is prior to the date of issuance, except as provided in Section 13 of the
Plan.

        5. TAX CONSULTATION. Purchaser understands that Purchaser may suffer
adverse tax consequences as a result of Purchaser's purchase or disposition of
the Shares. Purchaser represents that Purchaser has consulted with any tax
consultants Purchaser deems advisable in connection with the purchase or
disposition of the Shares and that Purchaser is not relying on the Company for
any tax advice.

        6. ENTIRE AGREEMENT; GOVERNING LAW. The Plan and Option Agreement are
incorporated herein by reference. This Agreement, the Plan and the Option
Agreement constitute the entire agreement of the parties with respect to the
subject matter hereof and supersede in their entirety all
<PAGE>   15
prior undertakings and agreements of the Company and Purchaser with respect to
the subject matter hereof, and may not be modified adversely to the Purchaser's
interest except by means of a writing signed by the Company and Purchaser. This
agreement is governed by the internal substantive laws, but not the choice of
law rules, of Delaware.


Submitted by:                             Accepted by:

PURCHASER:                                OCTEL COMMUNICATIONS
                                          CORPORATION


- ----------------------------------        -------------------------------------
Signature                                 By

- ----------------------------------        -------------------------------------
Print Name                                Title


                                          -------------------------------------
                                          Date Received


ADDRESS:

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

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

                                       -2-


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