OCTEL COMMUNICATIONS CORP
8-A12G/A, 1997-05-13
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 8-A/A

               FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                    PURSUANT TO SECTION 12(b) OR (g) OF THE
                        SECURITIES EXCHANGE ACT OF 1934


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

           DELAWARE                                     77-0029449
   -----------------------                         -------------------
   (STATE OF INCORPORATION                           (I.R.S. EMPLOYER
       OR ORGANIZATION                             IDENTIFICATION NO.)

                  1001 MURPHY RANCH ROAD, MILPITAS, CA  95035
- --------------------------------------------------------------------------------
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)

         If this Form relates to the registration of a class of debt securities
and is effective upon filing pursuant to General Instruction A.(c)(1), please
check the following box.  [ ]

         If this Form relates to the registration of a class of debt securities
and is to become effective simultaneously with the effectiveness of a
concurrent registration statement under the Securities Act of 1933 pursuant to
General Instruction A.(c)(2), please check the following box.  [ ]

       Securities to be registered pursuant to Section 12(b) of the Act:


    TITLE OF EACH CLASS                       NAME OF EACH EXCHANGE ON WHICH
    TO BE SO REGISTERED                       EACH CLASS IS TO BE REGISTERED
    -------------------                       ------------------------------
            NONE                                           NONE

       SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                        PREFERRED SHARE PURCHASE RIGHTS
- --------------------------------------------------------------------------------
                                (TITLE OF CLASS)


- --------------------------------------------------------------------------------
                                (TITLE OF CLASS)
<PAGE>   2
Item 1.  DESCRIPTION OF SECURITIES TO BE REGISTERED.

         On August 1, 1990, Octel Communications Corporation (the "Company")
filed a Registration Statement on Form 8-A (the "Registration Statement") with
the Securities Exchange Commission (the "Commission") in order to register
common share purchase rights issuable in accordance with the terms of the
Common Shares Rights Agreement (the "Original Rights Agreement") between the
Company and Bank of America NT & SA, as rights agent.  On August 30, 1996, the
Company filed an amendment to the Registration Statement with the Commission to
reflect the fact that the Company and The First National Bank of Boston, as
successor rights agent, entered into the Amended and Restated Common Shares
Rights Agreement (the "Prior Rights Agreement"), which supersedes the Original
Rights Agreement as originally executed

         On May 13, 1997, the Company and The First National Bank of Boston, as
successor rights agent, entered into the Second Amended and Restated Rights
Agreement (the "Amended Rights Agreement"), which supersedes the Prior Rights
Agreement as originally executed.  The Amended Rights Agreement is
substantially the same as the Prior Rights Agreement as originally executed,
with the following principal exceptions:

EXERCISABLE FOR PREFERRED STOCK

         Each Right is now exercisable, following the Distribution Date and
until the occurrence of certain specified events, for 1/100 of a share of a new
series of Preferred Stock designated "Series A Junior Participating Preferred
Stock."

EXPIRATION DATE OF THE RIGHTS

         The term of the Amended Rights Agreement has been extended from August
29, 2006 to May 13, 2007.

TRIGGERING OWNERSHIP THRESHOLD

         The Prior Rights Agreement provided that the "flip-in" provision of
the Rights would be triggered by an acquisition of 21% or more of the Company's
Common Stock.  The Amended Rights Agreement sets this threshold (the
"Triggering Threshold") at 20% and explicitly gives the Company's Board of
Directors the power to reduce the Triggering Threshold to 10%.

DISTRIBUTION DATE

         Under the Prior Rights Agreement, the Distribution Date was defined as
the earlier of (i) 10 days (or such later date as may be determined by the
Continuing Directors), following a public announcement that an "Acquiring
Person" (as defined) has acquired, or obtained the right to acquire, beneficial
ownership of a number of Common Shares equal to or greater than the Triggering
Threshold (the "Shares Acquisition Date") or (ii) 10 days (or such later date
as may be determined by a majority of the Continuing Directors) following the
commencement or announcement of a tender offer or exchange offer, the
consummation of which would result in the beneficial ownership by a person or
group of a number of Common Shares equal to or greater than the Triggering
Threshold.  Under the Amended Rights Plan, the Distribution Date is defined as
the earlier of (i) the tenth day after the Shares Acquisition Date or (ii)  the
tenth Business Day (or such later date as may be determined by action of the
Board of Directors prior to such time as any Person becomes an Acquiring
Person) after the date of the commencement by any person of, or of the first
public announcement of the intention of any person to commence, a tender or
exchange offer the consummation of which would result in any Person becoming
the Beneficial Owner of a number of Common Shares equal to or greater than the
Triggering Threshold.




                                      -2-
<PAGE>   3
AMENDMENT OF RIGHTS AGREEMENT

         The Prior Rights Agreement provided that the provisions of the Rights
Agreement could be supplemented or amended by the Board of Directors in any
manner prior to the close of business on the Distribution Date without the
approval of Rights holders.  After the Distribution Date, the provisions of the
Rights Agreement could be amended by the Board in order to cure any ambiguity,
defect or inconsistency, to make changes which do not adversely affect the
interests of holders of Rights (excluding the interests of any Acquiring
Person), or to shorten or lengthen any time period under the Rights Agreement;
provided, however, that no amendment to adjust the time period governing
redemption could be made at such time as (i) there is an Acquiring Person or
(ii) under certain circumstances, the majority of the directors in office shall
have changed to new directors associated with a person or group intending to
become an Acquiring Person.

         The Amended Rights Agreement provides that the Company may from time
to time supplement or amend the Rights Agreement without the approval of any
holders of Right Certificates in order to cure any ambiguity, to correct or
supplement any provision contained herein which may be defective or
inconsistent with any other provisions herein, or to make any other provisions
with respect to the Rights which the Company may deem necessary or desirable,
any such supplement or amendment to be evidenced by a writing signed by the
Company and the Rights Agent; provided, however, that from and after such time
as any Person becomes an Acquiring Person, the Rights Agreement shall not be
amended in any manner which would adversely affect the interests of the holders
of Rights.  Without limiting the foregoing, the Company may at any time prior
to such time as any Person becomes an Acquiring Person amend the Rights
Agreement to lower the Triggering Threshold to not less than the greater of (i)
the sum of .001% and the largest percentage of the outstanding Common Shares
then known by the Company to be beneficially owned by any Person (other than
the Company, any Subsidiary of the Company, any employee benefit plan of the
Company or any Subsidiary of the Company, or any entity holding Common Shares
for or pursuant to the terms of any such plan) and (ii) 10%.  Notwithstanding
the foregoing, in the event that a majority of the Board of Directors of the
Company is elected by stockholder action by written consent, then until the
earlier to occur of (i) the 180th day following the effectiveness of such
election or (ii) the next regular annual meeting of stockholders of the Company
following the effectiveness of such election (including any postponement or
adjournment thereof), the Rights Agreement shall not be supplemented or amended
in any manner reasonably likely to have the purpose or effect of facilitating a
Transaction (as defined) with an Interested Person (as defined).

ELIMINATION OF CERTAIN PROVISIONS

         The Amended Rights Agreement eliminates the permitted offer exceptions
to the "flip-in" and "flip-over" provisions. The existing "flip- in" provisions
in the Prior Rights Agreement provide that upon any person crossing the
triggering ownership threshold (other than as a result of a "permitted offer")
all of the Company's other stockholders would have the right to purchase
additional shares of the Company at a 50% discount.  "Permitted offers" were
defined as acquisitions pursuant to tender offers deemed adequate and otherwise
in the best interests of the Company by the Continuing Directors (as defined)
of the Company.  The "flip-over" provisions in the Prior Rights Agreement
provided that if any company were to merge or otherwise combine with the
Company or the Company were to sell 50% or more of its assets (other than in
certain transactions consummated with persons who acquired shares pursuant to a
permitted offer), each right would "flip-over" and become the right to purchase
common stock of the acquiring company at a 50% discount.  The "flip-in" and
"flip-over" provisions, absent the permitted offer exceptions, remain in the
Amended Rights Agreement.

         The Prior Rights Agreement provided an exception for a redemption
following acquisitions in excess of the triggering ownership threshold if such
redemption was in connection with a consolidation or merger in which





                                      -3-
<PAGE>   4
the Company was not the surviving corporation, the acquiror had held more than
21% of the Company's Common Stock for at least three years and the redemption
was approved by a majority of "continuing directors" (as defined).  The Amended
Rights Agreement eliminates this provision.

         The Prior Rights Agreement provided that Common Shares issued after
the Distribution Date could be issued with Rights if such shares were issued
(i) upon the conversion of securities issued after adoption of the Rights
Agreement or (ii) pursuant to the exercise of stock options or under employee
benefit plans unless such issuance would result in (or create a risk of) such
options or plans not qualifying for otherwise available special tax treatment.
The Amended Rights Agreement eliminates this provision.

         The Prior Rights Agreement provided that in the event that the Company
did not have sufficient Common Shares available for all Rights to be exercised,
or the Board decided that such action is necessary and not contrary to the
interests of Rights holders, the Company could instead substitute cash, assets
or other securities for the Common Shares into which the Rights would have
otherwise been exercisable.  The Amended Rights Agreement eliminates this
provision.

         The Prior Rights Agreement provided that the Rights could not be
redeemed after the date of a change in a majority of the directors resulting
from a proxy or consent solicitation, unless such redemption was approved by a
majority of "continuing directors."  "Continuing directors" was defined as
directors who were in office when the Rights Plan was adopted or who were
nominated by such directors and who were not affiliated with the acquiror.  The
Amended Rights Plan eliminates this provision and replaces it with a provision
that provides in the event that a majority of the Board is replaced as a result
of a consent solicitation, the Rights are not redeemable for 180 days following
the effectiveness of such election (or the next annual meeting, if sooner) if
such redemption is reasonably likely to have the purpose or effect of
facilitating a business combination with or acquisition by any person who
nominated any director so elected by written consent.

         In all other material respects, the disclosure concerning the Rights
and the Rights Agreement as set forth in the Registration Statement is
unchanged.

         The summary of the Amended Rights Agreement contained herein or in the
Registration Statement as originally filed is qualified in its entirety by
reference to the Amended Rights Agreement.

Item 2.  EXHIBITS.

                 1.       Second Amended and Restated Rights Agreement, dated
                          as of May 13, 1997 between Octel Communications
                          Corporation and The First National Bank of Boston,
                          including the form of Certificate of Designations,
                          Rights Certificate and the Summary of Rights attached
                          thereto as Exhibits A, B and C, respectively.





                                      -4-
<PAGE>   5
         Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934 the Registrant has duly caused this amendment to be signed on its
behalf by the undersigned, thereunto duly authorized.


Date:  May 13, 1997         OCTEL COMMUNICATIONS CORPORATION


                            By:  /s/ Derek S. Daley                             
                                ------------------------------------------------
                            Title: Vice President, General Counsel and Secretary
                                   ---------------------------------------------





                                      -5-
<PAGE>   6
                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
  EXHIBIT
    NO.                                  EXHIBIT
  -------     ----------------------------------------------------------------
    <S>       <C>
     1        Second Amended and Restated Rights Agreement, dated as of 
              May 13, 1997 between Octel Communications Corporation and The
              First National Bank of Boston, including the form of Certificate
              of Designations, Rights Certificate and the Summary of Rights
              attached thereto as Exhibits A, B and C, respectively.

</TABLE>





                                      -6-

<PAGE>   1





                        OCTEL COMMUNICATIONS CORPORATION

                                      AND

                       THE FIRST NATIONAL BANK OF BOSTON

                                  RIGHTS AGENT





                          SECOND AMENDED AND RESTATED

                                RIGHTS AGREEMENT



                            DATED AS OF MAY 13, 1997
<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                              PAGE
<S>                                                                                                            <C>
Section 1.  Certain Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1

Section 2.  Appointment of Rights Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4

Section 3.  Issue of Right Certificates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4

Section 4.  Form of Right Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

Section 5.  Countersignature and Registration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

Section 6.  Transfer, Split Up, Combination and Exchange of Right Certificates; Mutilated, 
Destroyed, Lost or Stolen Right Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights  . . . . . . . . . . . . . . . . . .  7

Section 8.  Cancellation and Destruction of Right Certificates . . . . . . . . . . . . . . . . . . . . . . . .  8

Section 9.  Availability of Preferred Shares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8

Section 10.  Preferred Shares Record Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

Section 11.  Adjustment of Purchase Price, Number of Shares or Number of Rights  . . . . . . . . . . . . . . .  9

Section 12.  Certificate of Adjusted Purchase Price or Number of Shares  . . . . . . . . . . . . . . . . . . . 14

Section 13.  Consolidation, Merger or Sale or Transfer of Assets or Earning Power  . . . . . . . . . . . . . . 15

Section 14.  Fractional Rights and Fractional Shares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Section 15.  Rights of Action  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Section 16.  Agreement of Right Holders  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Section 17.  Right Certificate Holder Not Deemed a Stockholder . . . . . . . . . . . . . . . . . . . . . . . . 17

Section 18.  Concerning the Rights Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Section 19.  Merger or Consolidation or Change of Name of Rights Agent . . . . . . . . . . . . . . . . . . . . 18

Section 20.  Duties of Rights Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
</TABLE>





                                      -i-
<PAGE>   3
                               TABLE OF CONTENTS
                                  (CONTINUED)

<TABLE>
<CAPTION>
                                                                                                              PAGE
<S>                                                                                                            <C>
Section 21.  Change of Rights Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Section 22.  Issuance of New Right Certificates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Section 23.  Redemption  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Section 24.  Exchange  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Section 25.  Notice of Certain Events  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Section 26.  Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Section 27.  Supplements and Amendments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Section 28.  Successors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Section 29.  Benefits of this Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Section 30.  Severability  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Section 31.  Governing Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Section 32.  Counterparts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Section 33.  Descriptive Headings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Signatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Exhibit A - Form of Certificate of Designations

Exhibit B - Form of Right Certificate

Exhibit C - Summary of Rights to Purchase Preferred Shares
</TABLE>





                                      -ii-
<PAGE>   4
                  SECOND AMENDED AND RESTATED RIGHTS AGREEMENT


         This Second Amended and Restated Rights Agreement, dated as of May 13,
1997, between Octel Communications Corporation, a Delaware corporation (the
"Company"), and The First National Bank of Boston (the "Rights Agent").

         WHEREAS, the Company and the Rights Agent are parties to that certain
Rights Agreement dated as of July 25, 1990, as amended and restated as of
August 29, 1996 (the "Prior Agreement");

         WHEREAS, on July 25, 1990 (the "Rights Dividend Declaration Date"),
the Board of Directors of the Company authorized and declared a dividend of one
Common Share Purchase Right (a "Right") for each Common Share (as hereinafter
defined) of the Company outstanding as of the Close of Business (as hereinafter
defined) on August 15, 1990 (the "Record Date"), each Right representing the
right to purchase one Common Share (as such number may be adjusted pursuant to
the provisions of this Agreement) upon the terms and subject to the conditions
herein set forth, and further authorized and directed the issuance of one Right
(as such number may be adjusted pursuant to the provisions of this Agreement)
with respect to each Common Share that shall become outstanding between the
Record Date and the earlier of the Distribution Date and the Expiration Date
(as such terms are hereinafter defined), and in certain circumstances after the
Distribution Date.

         WHEREAS, the Company has determined that, pursuant to Section 27 of
the Prior Agreement, the Prior Agreement shall be amended and restated as set
forth herein to, among other things, make each Right represent the right to
purchase one one-hundredth of a share of Series A Junior Participating
Preferred Stock (as such number may be adjusted pursuant to the provisions of
this Agreement), having the rights and preferences set forth in the form of
Certificate of Designations attached hereto as Exhibit A;

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

         Accordingly, in consideration of the premises and the mutual
agreements herein set forth, the parties hereby agree as follows:

         Section 1.  CERTAIN DEFINITIONS.  For purposes of this Agreement, the
following terms have the meanings indicated:

                 (a)      "Acquiring Person" shall mean any Person (as such
term is hereinafter defined) who or which, together with all Affiliates and
Associates (as such terms are hereinafter defined) of such Person, shall be the
Beneficial Owner (as such term is hereinafter defined) of 20% or more of the
Common Shares of the Company then outstanding, but shall not include the
Company, any Subsidiary (as such term is hereinafter defined) of the Company,
any employee benefit plan of the Company or any Subsidiary of the Company, or
any entity holding Common Shares for or pursuant to the terms of any such plan.
Notwithstanding the foregoing, no Person shall become an "Acquiring Person" as
the result





<PAGE>   5
of an acquisition of Common Shares by the Company which, by reducing the number
of shares outstanding, increases the proportionate number of shares
beneficially owned by such Person to 20% or more of the Common Shares of the
Company then outstanding; provided, however, that if a Person shall become the
Beneficial Owner of 20% or more of the Common Shares of the Company then
outstanding by reason of share purchases by the Company and shall, after such
share purchases by the Company, become the Beneficial Owner of any additional
Common Shares of the Company, then such Person shall be deemed to be an
"Acquiring Person".  Notwithstanding the foregoing, if the Board of Directors
of the Company determines in good faith that a Person who would otherwise be an
"Acquiring Person", as defined pursuant to the foregoing provisions of this
paragraph (a), has become such inadvertently, and such Person divests as
promptly as practicable a sufficient number of Common Shares so that such
Person would no longer be an "Acquiring Person," as defined pursuant to the
foregoing provisions of this paragraph (a), then such Person shall not be
deemed to be an "Acquiring Person" for any purposes of this Agreement.

                 (b)      "Affiliate" and "Associate" shall have the respective
meanings ascribed to such terms in Rule 12b-2 of the General Rules and
Regulations under the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), as in effect on the date of this Agreement.

                 (c)      A Person shall be deemed the "Beneficial Owner" of
and shall be deemed to "beneficially own" any securities:

                          (i)     which such Person or any of such Person's
                 Affiliates or Associates beneficially owns, directly or 
                 indirectly;

                          (ii)    which such Person or any of such Person's
                 Affiliates or Associates has (A) the right to acquire (whether
                 such right is exercisable immediately or only after the
                 passage of time) pursuant to any agreement, arrangement or
                 understanding (other than customary agreements with and
                 between underwriters and selling group members with respect to
                 a bona fide public offering of securities), or upon the
                 exercise of conversion rights, exchange rights, rights (other
                 than these Rights), warrants or options, or otherwise;
                 provided, however, that a Person shall not be deemed the
                 Beneficial Owner of, or to beneficially own, securities
                 tendered pursuant to a tender or exchange offer made by or on
                 behalf of such Person or any of such Person's Affiliates or
                 Associates until such tendered securities are accepted for
                 purchase or exchange; or (B) the right to vote pursuant to any
                 agreement, arrangement or understanding; provided, however,
                 that a Person shall not be deemed the Beneficial Owner of, or
                 to beneficially own, any security if the agreement,
                 arrangement or understanding to vote such security (1) arises
                 solely from a revocable proxy or consent given to such Person
                 in response to a public proxy or consent solicitation made
                 pursuant to, and in accordance with, the applicable rules and
                 regulations promulgated under the Exchange Act and (2) is not
                 also then reportable on Schedule 13D under the Exchange Act
                 (or any comparable or successor report); or





                                      -2-
<PAGE>   6
                          (iii)   which are beneficially owned, directly or
                 indirectly, by any other Person with which such Person or any
                 of such Person's Affiliates or Associates has any agreement,
                 arrangement or understanding (other than customary agreements
                 with and between underwriters and selling group members with
                 respect to a bona fide public offering of securities) for the
                 purpose of acquiring, holding, voting (except to the extent
                 contemplated by the proviso to Section 1(c)(ii)(B)) or
                 disposing of any securities of the Company.

                          Notwithstanding anything in this definition of
Beneficial Ownership to the contrary, the phrase "then outstanding," when used
with reference to a Person's Beneficial Ownership of securities of the Company,
shall mean the number of such securities then issued and outstanding together
with the number of such securities not then actually issued and outstanding
which such Person would be deemed to own beneficially hereunder.

                 (d)      "Business Day" shall mean any day other than a
Saturday, a Sunday, or a day on which banking institutions in California are
authorized or obligated by law or executive order to close.

                 (e)      "Close of business" on any given date shall mean 5:00
p.m., New York time, on such date; provided, however, that if such date is not
a Business Day it shall mean 5:00 p.m., New York time, on the next succeeding
Business Day.

                 (f)      "Common Shares" when used with reference to the
Company shall mean the shares of common stock, par value $.001 per share, of
the Company.  "Common Shares" when used with reference to any Person other than
the Company shall mean the capital stock (or equity interest) with the greatest
voting power of such other Person or, if such other Person is a Subsidiary of
another Person, the Person or Persons which ultimately control such
first-mentioned Person.

                 (g)      "Continuing Director" shall mean (i) any member of
the Board of Directors of the Company who, while a member of the Board, is not
an Acquiring Person, or an Affiliate or Associate of an Acquiring Person, or a
representative or nominee of an Acquiring Person or of any such Affiliate or
Associate, and who was a member of the Board of Directors of the Company prior
to the date of this Agreement, or (ii) any Person who subsequently becomes a
member of the Board who, while a member of the Board, is not an Acquiring
Person, or an Affiliate or Associate of an Acquiring Person, or a
representative or nominee of an Acquiring Person or of any such Affiliate or
Associate, if such Person's nomination for election or election to the Board is
recommended or approved by a majority of the Continuing Directors then on the
Board.

                 (h)      "Distribution Date" shall have the meaning set forth
in Section 3 hereof.

                 (i)      "Interested Person" with respect to a Transaction
shall mean any Person who (i) is or will become an Acquiring Person if the
Transaction were to be consummated or an Affiliate or Associate of such a
Person, and (ii) is, or directly or indirectly proposed, nominated or
financially supported a director of the Company in office at the time of
consideration of the Transaction in question who was elected by written consent
of stockholders.





                                      -3-
<PAGE>   7
                 (i)      "Final Expiration Date" shall have the meaning set
forth in Section 7 hereof.

                 (j)      "Person" shall mean any individual, firm, corporation
or other entity, and shall include any successor (by merger or otherwise) of
such entity.

                 (k)      "Preferred Shares" shall mean shares of Series A
Junior Participating Preferred Stock, par value $.001 per share, of the Company
having the rights and preferences set forth in the Form of Certificate of
Designations attached to this Agreement as Exhibit A.

                 (l)      "Redemption Date" shall have the meaning set forth in
Section 7 hereof.

                 (m)      "Shares Acquisition Date" shall mean the first date
of public announcement by the Company or an Acquiring Person that an Acquiring
Person has become such.

                 (n)      "Subsidiary" of any Person shall mean any corporation
or other entity of which a majority of the voting power of the voting equity
securities or equity interest is owned, directly or indirectly, by such Person.

                 (o)      "Transaction" shall mean any merger, consolidation or
sale of assets described in Section 13(a) hereof or any acquisition of Common
Shares which would result in a Person becoming an Acquiring Person.

         Section 2.  APPOINTMENT OF RIGHTS AGENT.  The Company hereby appoints
the Rights Agent to act as agent for the Company and the holders of the Rights
(who, in accordance with Section 3 hereof, shall prior to the Distribution Date
also be the holders of the Common Shares) in accordance with the terms and
conditions hereof, and the Rights Agent hereby accepts such appointment.  The
Company may from time to time appoint such co-Rights Agents as it may deem
necessary or desirable.

         Section 3.  ISSUE OF RIGHT CERTIFICATES.

                 (a)      Until the earlier of (i) the tenth day after the
Shares Acquisition Date or (ii) the tenth Business Day (or such later date as
may be determined by action of the Board of Directors prior to such time as any
Person becomes an Acquiring Person) after the date of the commencement by any
Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or of any Subsidiary of the Company or any entity
holding Common Shares for or pursuant to the terms of any such plan) of, or of
the first public announcement of the intention of any Person (other than the
Company, any Subsidiary of the Company, any employee benefit plan of the
Company or of any Subsidiary of the Company or any entity holding Common Shares
for or pursuant to the terms of any such plan) to commence, a tender or
exchange offer the consummation of which would result in any Person becoming
the Beneficial Owner of Common Shares aggregating 20% or more of the then
outstanding Common Shares (including any such date which is after the date of
this Agreement and prior to the issuance of the Rights; the earlier of such
dates being herein referred to as the "Distribution Date"), (x) the Rights will
be evidenced (subject to the provisions of Section 3(b) hereof) by the





                                      -4-
<PAGE>   8
certificates for Common Shares registered in the names of the holders thereof
(which certificates shall also be deemed to be Right Certificates) and not by
separate Right Certificates, and (y) the right to receive Right Certificates
will be transferable only in connection with the transfer of Common Shares.  As
soon as practicable after the Distribution Date, the Company will prepare and
execute, the Rights Agent will countersign, and the Company will send or cause
to be sent (and the Rights Agent will, if requested, send) by first-class,
insured, postage-prepaid mail, to each record holder of Common Shares as of the
Close of Business on the Distribution Date, at the address of such holder shown
on the records of the Company, a Right Certificate, in substantially the form
of Exhibit B hereto (a "Right Certificate"), evidencing one Right for each
Common Share so held.  As of the Distribution Date, the Rights will be
evidenced solely by such Right Certificates.

                 (b)      On the Record Date, or as soon as practicable
thereafter, the Company will send a copy of a Summary of Rights to Purchase
Preferred Shares, in substantially the form of Exhibit C hereto (the "Summary
of Rights"), by first-class, postage-prepaid mail, to each record holder of
Common Shares as of the Close of Business on the Record Date, at the address of
such holder shown on the records of the Company.  With respect to certificates
for Common Shares outstanding as of the Record Date, until the Distribution
Date, the Rights will be evidenced by such certificates registered in the names
of the holders thereof together with a copy of the Summary of Rights attached
thereto.  Until the Distribution Date (or the earlier of the Redemption Date or
the Final Expiration Date), the surrender for transfer of any certificate for
Common Shares outstanding on the Record Date, with or without a copy of the
Summary of Rights attached thereto, shall also constitute the transfer of the
Rights associated with the Common Shares represented thereby.

                 (c)      Certificates for Common Shares which become
outstanding (including, without limitation, reacquired Common Shares referred
to in the last sentence of this paragraph (c)) after the Record Date but prior
to the earliest of the Distribution Date, the Redemption Date or the Final
Expiration Date shall have impressed on, printed on, written on or otherwise
affixed to them the following legend:

         This certificate also evidences and entitles the holder hereof to
         certain rights as set forth in the Second Amended and Restated Rights
         Agreement between Octel Communications Corporation and The First
         National Bank of Boston, dated as of May 13, 1997 (the "Rights
         Agreement"), the terms of which are hereby incorporated herein by
         reference and a copy of which is on file at the principal executive
         offices of Octel Communications Corporation.  Under certain
         circumstances, as set forth in the Rights Agreement, such Rights will
         be evidenced by separate certificates and will no longer be evidenced
         by this certificate.  Octel Communications Corporation will mail to
         the holder of this certificate a copy of the Rights Agreement without
         charge after receipt of a written request therefor.  Under certain
         circumstances, as set forth in the Rights Agreement, Rights issued to
         any Person who becomes an Acquiring Person (as defined in the Rights
         Agreement) may become null and void.

With respect to such certificates containing the foregoing legend, until the
Distribution Date, the Rights associated with the Common Shares represented by
such certificates shall be evidenced by such certificates alone, and the
surrender for transfer of any such certificate shall also constitute the
transfer





                                      -5-
<PAGE>   9
of the Rights associated with the Common Shares represented thereby.  In the
event that the Company purchases or acquires any Common Shares after the Record
Date but prior to the Distribution Date, any Rights associated with such Common
Shares shall be deemed cancelled and retired so that the Company shall not be
entitled to exercise any Rights associated with the Common Shares which are no
longer outstanding.

         Section 4.  FORM OF RIGHT CERTIFICATES.  The Right Certificates (and
the forms of election to purchase Preferred Shares and of assignment to be
printed on the reverse thereof) shall be substantially the same as Exhibit B
hereto and may have such marks of identification or designation and such
legends, summaries or endorsements printed thereon as the Company may deem
appropriate and as are not inconsistent with the provisions of this Agreement,
or as may be required to comply with any applicable law or with any rule or
regulation made pursuant thereto or with any rule or regulation of any stock
exchange or automated quotation system on which the Rights may from time to
time be listed, or to conform to usage.  Subject to the provisions of Section
22 hereof, the Right Certificates shall entitle the holders thereof to purchase
such number of one one-hundredths of a Preferred Share as shall be set forth
therein at the price per one one-hundredth of a Preferred Share set forth
therein (the "Purchase Price"), but the number of such one one-hundredths of a
Preferred Share and the Purchase Price shall be subject to adjustment as
provided herein.

         Section 5.  COUNTERSIGNATURE AND REGISTRATION.  The Right Certificates
shall be executed on behalf of the Company by its Chairman of the Board, its
Chief Executive Officer, its President, any of its Vice Presidents, or its
Treasurer, either manually or by facsimile signature, shall have affixed
thereto the Company's seal or a facsimile thereof, and shall be attested by the
Secretary or an Assistant Secretary of the Company, either manually or by
facsimile signature.  The Right Certificates shall be manually countersigned by
the Rights Agent and shall not be valid for any purpose unless countersigned.
In case any officer of the Company who shall have signed any of the Right
Certificates shall cease to be such officer of the Company before
countersignature by the Rights Agent and issuance and delivery by the Company,
such Right Certificates, nevertheless, may be countersigned by the Rights Agent
and issued and delivered by the Company with the same force and effect as
though the person who signed such Right Certificates had not ceased to be such
officer of the Company; and any Right Certificate may be signed on behalf of
the Company by any person who, at the actual date of the execution of such
Right Certificate, shall be a proper officer of the Company to sign such Right
Certificate, although at the date of the execution of this Rights Agreement any
such person was not such an officer.

         Following the Distribution Date, the Rights Agent will keep or cause
to be kept, at its principal office, books for registration and transfer of the
Right Certificates issued hereunder.  Such books shall show the names and
addresses of the respective holders of the Right Certificates, the number of
Rights evidenced on its face by each of the Right Certificates and the date of
each of the Right Certificates.

         Section 6.  TRANSFER, SPLIT UP, COMBINATION AND EXCHANGE OF RIGHT
CERTIFICATES; MUTILATED, DESTROYED, LOST OR STOLEN RIGHT CERTIFICATES.  Subject
to the provisions of Section 14 hereof, at any time after the Close of Business
on the Distribution Date, and at or prior to the Close of Business on the
earlier of the Redemption Date or the Final Expiration Date, any Right
Certificate or Right Certificates (other than Right Certificates representing
Rights that have become void pursuant to Section 11(a)(ii)





                                      -6-
<PAGE>   10
hereof or that have been exchanged pursuant to Section 24 hereof) may be
transferred, split up, combined or exchanged for another Right Certificate or
Right Certificates, entitling the registered holder to purchase a like number
of one one-hundredths of a Preferred Share as the Right Certificate or Right
Certificates surrendered then entitled such holder to purchase.  Any registered
holder desiring to transfer, split up, combine or exchange any Right
Certificate or Right Certificates shall make such request in writing delivered
to the Rights Agent, and shall surrender the Right Certificate or Right
Certificates to be transferred, split up, combined or exchanged at the
principal office of the Rights Agent.  Thereupon the Rights Agent shall
countersign and deliver to the person entitled thereto a Right Certificate or
Right Certificates, as the case may be, as so requested.  The Company may
require payment of a sum sufficient to cover any tax or governmental charge
that may be imposed in connection with any transfer, split up, combination or
exchange of Right Certificates.

         Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation
of a Right Certificate, and, in case of loss, theft or destruction, of
indemnity or security reasonably satisfactory to them, and, at the Company's
request, reimbursement to the Company and the Rights Agent of all reasonable
expenses incidental thereto, and upon surrender to the Rights Agent and
cancellation of the Right Certificate if mutilated, the Company will make and
deliver a new Right Certificate of like tenor to the Rights Agent for delivery
to the registered holder in lieu of the Right Certificate so lost, stolen,
destroyed or mutilated.

         Section 7.  EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF
RIGHTS.

                 (a)      The registered holder of any Right Certificate may
exercise the Rights evidenced thereby (except as otherwise provided herein) in
whole or in part at any time after the Distribution Date upon surrender of the
Right Certificate, with the form of election to purchase on the reverse side
thereof duly executed, to the Rights Agent at the principal office of the
Rights Agent, together with payment of the Purchase Price for each one
one-hundredth of a Preferred Share as to which the Rights are exercised, at or
prior to the earliest of (i) the close of business on May 13, 2007 (the "Final
Expiration Date"), (ii) the time at which the Rights are redeemed as provided
in Section 23 hereof (the "Redemption Date"), or (iii) the time at which such
Rights are exchanged as provided in Section 24 hereof.

                 (b)      The Purchase Price for each one one-hundredth of a
Preferred Share purchasable pursuant to the exercise of a Right shall initially
be $100.00, and shall be subject to adjustment from time to time as provided in
Section 11 or 13 hereof and shall be payable in lawful money of the United
States of America in accordance with paragraph (c) below.

                 (c)      Upon receipt of a Right Certificate representing
exercisable Rights, with the form of election to purchase duly executed,
accompanied by payment of the Purchase Price for the shares to be purchased and
an amount equal to any applicable transfer tax required to be paid by the
holder of such Right Certificate in accordance with Section 9 hereof by
certified check, cashier's check or money order payable to the order of the
Company, the Rights Agent shall thereupon promptly (i) (A) requisition from any
transfer agent of the Preferred Shares certificates for the number of Preferred
Shares to be purchased and the Company hereby irrevocably authorizes its
transfer agent to comply with all such requests, or (B) requisition from the
depositary agent depositary receipts representing such number of one





                                      -7-
<PAGE>   11
one-hundredths of a Preferred Share as are to be purchased (in which case
certificates for the Preferred Shares represented by such receipts shall be
deposited by the transfer agent with the depositary agent) and the Company
hereby directs the depositary agent to comply with such request, (ii) when
appropriate, requisition from the Company the amount of cash to be paid in lieu
of issuance of fractional shares in accordance with Section 14 hereof, (iii)
after receipt of such certificates or depositary receipts, cause the same to be
delivered to or upon the order of the registered holder of such Right
Certificate, registered in such name or names as may be designated by such
holder and (iv) when appropriate, after receipt, deliver such cash to or upon
the order of the registered holder of such Right Certificate.

                 (d)      In case the registered holder of any Right
Certificate shall exercise less than all the Rights evidenced thereby, a new
Right Certificate evidencing Rights equivalent to the Rights remaining
unexercised shall be issued by the Rights Agent to the registered holder of
such Right Certificate or to his duly authorized assigns, subject to the
provisions of Section 14 hereof.

         Section 8.  CANCELLATION AND DESTRUCTION OF RIGHT CERTIFICATES.  All
Right Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in cancelled form,
or, if surrendered to the Rights Agent, shall be cancelled by it, and no Right
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Rights Agreement.  The Company shall deliver to
the Rights Agent for cancellation and retirement, and the Rights Agent shall so
cancel and retire, any other Right Certificate purchased or acquired by the
Company otherwise than upon the exercise thereof.  The Rights Agent shall
deliver all cancelled Right Certificates to the Company, or shall, at the
written request of the Company, destroy such cancelled Right Certificates, and
in such case shall deliver a certificate of destruction thereof to the Company.

         Section 9.  AVAILABILITY OF PREFERRED SHARES.  The Company covenants
and agrees that it will cause to be reserved and kept available out of its
authorized and unissued Preferred Shares or any Preferred Shares held in its
treasury, the number of Preferred Shares that will be sufficient to permit the
exercise in full of all outstanding Rights in accordance with Section 7.  The
Company covenants and agrees that it will take all such action as may be
necessary to ensure that all Preferred Shares delivered upon exercise of Rights
shall, at the time of delivery of the certificates for such Preferred Shares
(subject to payment of the Purchase Price), be duly and validly authorized and
issued and fully paid and nonassessable shares.

         The Company further covenants and agrees that it will pay when due and
payable any and all federal and state transfer taxes and charges which may be
payable in respect of the issuance or delivery of the Right Certificates or of
any Preferred Shares upon the exercise of Rights.  The Company shall not,
however, be required to pay any transfer tax which may be payable in respect of
any transfer or delivery of Right Certificates to a person other than, or the
issuance or delivery of certificates or depositary receipts for the Preferred
Shares in a name other than that of, the registered holder of the Right
Certificate evidencing Rights surrendered for exercise or to issue or to
deliver any certificates or depositary receipts for Preferred Shares upon the
exercise of any Rights until any such tax shall have been paid (any such tax
being payable by the holder of such Right Certificate at the time of surrender)
or until it has been established to the Company's reasonable satisfaction that
no such tax is due.





                                      -8-
<PAGE>   12
         Section 10.  PREFERRED SHARES RECORD DATE.  Each person in whose name
any certificate for Preferred Shares is issued upon the exercise of Rights
shall for all purposes be deemed to have become the holder of record of the
Preferred Shares represented thereby on, and such certificate shall be dated,
the date upon which the Right Certificate evidencing such Rights was duly
surrendered and payment of the Purchase Price (and any applicable transfer
taxes) was made; provided, however, that if the date of such surrender and
payment is a date upon which the Preferred Shares transfer books of the Company
are closed, such person shall be deemed to have become the record holder of
such shares on, and such certificate shall be dated, the next succeeding
Business Day on which the Preferred Shares transfer books of the Company are
open.  Prior to the exercise of the Rights evidenced thereby, the holder of a
Right Certificate shall not be entitled to any rights of a holder of Preferred
Shares for which the Rights shall be exercisable, including, without
limitation, the right to vote, to receive dividends or other distributions or
to exercise any preemptive rights, and shall not be entitled to receive any
notice of any proceedings of the Company, except as provided herein.

         Section 11.  ADJUSTMENT OF PURCHASE PRICE, NUMBER OF SHARES OR NUMBER
OF RIGHTS.  The Purchase Price, the number of Preferred Shares covered by each
Right and the number of Rights outstanding are subject to adjustment from time
to time as provided in this Section 11.

                 (a)      (i)     In the event the Company shall at any time
after the date of this Agreement (A) declare a dividend on the Preferred Shares
payable in Preferred Shares, (B) subdivide the outstanding Preferred Shares,
(C) combine the outstanding Preferred Shares into a smaller number of Preferred
Shares or (D) issue any shares of its capital stock in a reclassification of
the Preferred Shares (including any such reclassification in connection with a
consolidation or merger in which the Company is the continuing or surviving
corporation), except as otherwise provided in this Section 11(a), the Purchase
Price in effect at the time of the record date for such dividend or of the
effective date of such subdivision, combination or reclassification, and the
number and kind of shares of capital stock issuable on such date, shall be
proportionately adjusted so that the holder of any Right exercised after such
time shall be entitled to receive the aggregate number and kind of shares of
capital stock which, if such Right had been exercised immediately prior to such
date and at a time when the Preferred Shares transfer books of the Company were
open, he would have owned upon such exercise and been entitled to receive by
virtue of such dividend, subdivision, combination or reclassification;
provided, however, that in no event shall the consideration to be paid upon the
exercise of one Right be less than the aggregate par value of the shares of
capital stock of the Company issuable upon exercise of one Right.

                          (ii)    Subject to Section 24 of this Agreement, in
the event any Person becomes an Acquiring Person, each holder of a Right shall
thereafter have a right to receive, upon exercise thereof at a price equal to
the then current Purchase Price multiplied by the number of one one-hundredths
of a Preferred Share for which a Right is then exercisable, in accordance with
the terms of this Agreement and in lieu of Preferred Shares, such number of
Common Shares of the Company as shall equal the result obtained by (A)
multiplying the then current Purchase Price by the number of one one-hundredths
of a Preferred Share for which a Right is then exercisable and dividing that
product by (B) 50% of the then current per share market price of the Company's
Common Shares (determined pursuant to Section 11(d) hereof) on the date of the
occurrence of such event.  In the event that any Person shall become an





                                      -9-
<PAGE>   13
Acquiring Person and the Rights shall then be outstanding, the Company shall
not take any action which would eliminate or diminish the benefits intended to
be afforded by the Rights.

                                  From and after the occurrence of such event,
any Rights that are or were acquired or beneficially owned by any Acquiring
Person (or any Associate or Affiliate of such Acquiring Person) shall be void
and any holder of such Rights shall thereafter have no right to exercise such
Rights under any provision of this Agreement.  No Right Certificate shall be
issued pursuant to Section 3 that represents Rights beneficially owned by an
Acquiring Person whose Rights would be void pursuant to the preceding sentence
or any Associate or Affiliate thereof; no Right Certificate shall be issued at
any time upon the transfer of any Rights to an Acquiring Person whose Rights
would be void pursuant to the preceding sentence or any Associate or Affiliate
thereof or to any nominee of such Acquiring Person, Associate or Affiliate; and
any Right Certificate delivered to the Rights Agent for transfer to an
Acquiring Person whose Rights would be void pursuant to the preceding sentence
shall be cancelled.

                          (iii)   In the event that there shall not be
sufficient Common Shares issued but not outstanding or authorized but unissued
to permit the exercise in full of the Rights in accordance with the foregoing
subparagraph (ii), the Company shall take all such action as may be necessary
to authorize additional Common Shares for issuance upon exercise of the Rights.
In the event the Company shall, after good faith effort, be unable to take all
such action as may be necessary to authorize such additional Common Shares, the
Company shall substitute, for each Common Share that would otherwise be
issuable upon exercise of a Right, a number of Preferred Shares or fraction
thereof such that the current per share market price of one Preferred Share
multiplied by such number or fraction is equal to the current per share market
price of one Common Share as of the date of issuance of such Preferred Shares
or fraction thereof.

                 (b)      In case the Company shall fix a record date for the
issuance of rights, options or warrants to all holders of Preferred Shares
entitling them (for a period expiring within 45 calendar days after such record
date) to subscribe for or purchase Preferred Shares (or shares having the same
rights, privileges and preferences as the Preferred Shares ("equivalent
preferred shares")) or securities convertible into Preferred Shares or
equivalent preferred shares at a price per Preferred Share or equivalent
preferred share (or having a conversion price per share, if a security
convertible into Preferred Shares or equivalent preferred shares) less than the
then current per share market price of the Preferred Shares (as defined in
Section 11(d)) on such record date, the Purchase Price to be in effect after
such record date shall be determined by multiplying the Purchase Price in
effect immediately prior to such record date by a fraction, the numerator of
which shall be the number of Preferred Shares outstanding on such record date
plus the number of Preferred Shares which the aggregate offering price of the
total number of Preferred Shares and/or equivalent preferred shares so to be
offered (and/or the aggregate initial conversion price of the convertible
securities so to be offered) would purchase at such current market price and
the denominator of which shall be the number of Preferred Shares outstanding on
such record date plus the number of additional Preferred Shares and/or
equivalent preferred shares to be offered for subscription or purchase (or into
which the convertible securities so to be offered are initially convertible);
provided, however, that in no event shall the consideration to be paid upon the
exercise of one Right be less than the aggregate par value of the shares of
capital stock of the Company issuable upon exercise of one Right.  In case such
subscription price may be paid in a consideration part or all





                                      -10-
<PAGE>   14
of which shall be in a form other than cash, the value of such consideration
shall be as determined in good faith by the Board of Directors of the Company,
whose determination shall be described in a statement filed with the Rights
Agent.  Preferred Shares owned by or held for the account of the Company shall
not be deemed outstanding for the purpose of any such computation.  Such
adjustment shall be made successively whenever such a record date is fixed; and
in the event that such rights, options or warrants are not so issued, the
Purchase Price shall be adjusted to be the Purchase Price which would then be
in effect if such record date had not been fixed.

                 (c)      In case the Company shall fix a record date for the
making of a distribution to all holders of the Preferred Shares (including any
such distribution made in connection with a consolidation or merger in which
the Company is the continuing or surviving corporation) of evidences of
indebtedness or assets (other than a regular quarterly cash dividend or a
dividend payable in Preferred Shares) or subscription rights or warrants
(excluding those referred to in Section 11(b) hereof), the Purchase Price to be
in effect after such record date shall be determined by multiplying the
Purchase Price in effect immediately prior to such record date by a fraction,
the numerator of which shall be the then current per share market price of the
Preferred Shares on such record date, less the fair market value (as determined
in good faith by the Board of Directors of the Company, whose determination
shall be described in a statement filed with the Rights Agent) of the portion
of the assets or evidences of indebtedness so to be distributed or of such
subscription rights or warrants applicable to one Preferred Share and the
denominator of which shall be such current per share market price of the
Preferred Shares; provided, however, that in no event shall the consideration
to be paid upon the exercise of one Right be less than the aggregate par value
of the shares of capital stock of the Company to be issued upon exercise of one
Right.  Such adjustments shall be made successively whenever such a record date
is fixed; and in the event that such distribution is not so made, the Purchase
Price shall again be adjusted to be the Purchase Price which would then be in
effect if such record date had not been fixed.

                 (d)      (i)     For the purpose of any computation hereunder,
the "current per share market price" of any security (a "Security" for the
purpose of this Section 11(d)(i)) on any date shall be deemed to be the average
of the daily closing prices per share of such Security for the 30 consecutive
Trading Days (as such term is hereinafter defined) immediately prior to such
date; provided, however, that in the event that the current per share market
price of the Security is determined during a period following the announcement
by the issuer of such Security of (A) a dividend or distribution on such
Security payable in shares of such Security or securities convertible into such
shares, or (B) any subdivision, combination or reclassification of such
Security and prior to the expiration of 30 Trading Days after the ex-dividend
date for such dividend or distribution, or the record date for such
subdivision, combination or reclassification, then, and in each such case, the
current per share market price shall be appropriately adjusted to reflect the
current market price per share equivalent of such Security.  The closing price
for each day shall be the last sale price, regular way, or, in case no such
sale takes place on such day, the average of the closing bid and asked prices,
regular way, in either case as reported in the principal consolidated
transaction reporting system with respect to securities listed or admitted to
trading on the New York Stock Exchange or, if the Security is not listed or
admitted to trading on the New York Stock Exchange, as reported in the
principal consolidated transaction reporting system with respect to securities
listed on the principal national securities exchange on which the Security is
listed or admitted to trading or, if the Security is not listed or admitted to
trading on any national securities





                                      -11-
<PAGE>   15
exchange, the last quoted price or, if not so quoted, the average of the high
bid and low asked prices in the over-the-counter market, as reported by the
National Association of Securities Dealers, Inc. Automated Quotations System
("NASDAQ") or such other system then in use, or, if on any such date the
Security is not quoted by any such organization, the average of the closing bid
and asked prices as furnished by a professional market maker making a market in
the Security selected by the Board of Directors of the Company.  The term
"Trading Day" shall mean a day on which the principal national securities
exchange on which the Security is listed or admitted to trading is open for the
transaction of business or, if the Security is not listed or admitted to
trading on any national securities exchange, a Business Day.

                          (ii)    For the purpose of any computation hereunder,
the "current per share market price" of the Preferred Shares shall be
determined in accordance with the method set forth in Section 11(d)(i).  If the
Preferred Shares are not publicly traded, the "current per share market price"
of the Preferred Shares shall be conclusively deemed to be the current per
share market price of the Common Shares as determined pursuant to Section
11(d)(i) (appropriately adjusted to reflect any stock split, stock dividend or
similar transaction occurring after the date hereof), multiplied by one
hundred.  If neither the Common Shares nor the Preferred Shares are publicly
held or so listed or traded, "current per share market price" shall mean the
fair value per share as determined in good faith by the Board of Directors of
the Company, whose determination shall be described in a statement filed with
the Rights Agent.

                 (e)      No adjustment in the Purchase Price shall be required
unless such adjustment would require an increase or decrease of at least 1% in
the Purchase Price; provided, however, that any adjustments which by reason of
this Section 11(e) are not required to be made shall be carried forward and
taken into account in any subsequent adjustment.  All calculations under this
Section 11 shall be made to the nearest cent or to the nearest one
one-millionth of a Preferred Share or one ten-thousandth of any other share or
security as the case may be.  Notwithstanding the first sentence of this
Section 11(e), any adjustment required by this Section 11 shall be made no
later than the earlier of (i) three years from the date of the transaction
which requires such adjustment or (ii) the date of the expiration of the right
to exercise any Rights.

                 (f)      If as a result of an adjustment made pursuant to
Section 11(a) hereof, the holder of any Right thereafter exercised shall become
entitled to receive any shares of capital stock of the Company other than
Preferred Shares, thereafter the number of such other shares so receivable upon
exercise of any Right shall be subject to adjustment from time to time in a
manner and on terms as nearly equivalent as practicable to the provisions with
respect to the Preferred Shares contained in Section 11(a) through (c),
inclusive, and the provisions of Sections 7, 9, 10 and 13 with respect to the
Preferred Shares shall apply on like terms to any such other shares.

                 (g)      All Rights originally issued by the Company
subsequent to any adjustment made to the Purchase Price hereunder shall
evidence the right to purchase, at the adjusted Purchase Price, the number of
one one-hundredths of a Preferred Share purchasable from time to time hereunder
upon exercise of the Rights, all subject to further adjustment as provided
herein.





                                      -12-
<PAGE>   16
                 (h)      Unless the Company shall have exercised its election
as provided in Section 11(i), upon each adjustment of the Purchase Price as a
result of the calculations made in Sections 11(b) and (c), each Right
outstanding immediately prior to the making of such adjustment shall thereafter
evidence the right to purchase, at the adjusted Purchase Price, that number of
one one-hundredths of a Preferred Share (calculated to the nearest one
one-millionth of a Preferred Share) obtained by (A) multiplying (x) the number
of one one-hundredths of a share covered by a Right immediately prior to this
adjustment by (y) the Purchase Price in effect immediately prior to such
adjustment of the Purchase Price and (B) dividing the product so obtained by
the Purchase Price in effect immediately after such adjustment of the Purchase
Price.

                 (i)      The Company may elect on or after the date of any
adjustment of the Purchase Price to adjust the number of Rights, in
substitution for any adjustment in the number of one one-hundredths of a
Preferred Share purchasable upon the exercise of a Right.  Each of the Rights
outstanding after such adjustment of the number of Rights shall be exercisable
for the number of one one-hundredths of a Preferred Share for which a Right was
exercisable immediately prior to such adjustment.  Each Right held of record
prior to such adjustment of the number of Rights shall become that number of
Rights (calculated to the nearest one ten-thousandth) obtained by dividing the
Purchase Price in effect immediately prior to adjustment of the Purchase Price
by the Purchase Price in effect immediately after adjustment of the Purchase
Price.  The Company shall make a public announcement of its election to adjust
the number of Rights, indicating the record date for the adjustment, and, if
known at the time, the amount of the adjustment to be made.  This record date
may be the date on which the Purchase Price is adjusted or any day thereafter,
but, if the Right Certificates have been issued, shall be at least 10 days
later than the date of the public announcement.  If Right Certificates have
been issued, upon each adjustment of the number of Rights pursuant to this
Section 11(i), the Company shall, as promptly as practicable, cause to be
distributed to holders of record of Right Certificates on such record date
Right Certificates evidencing, subject to Section 14 hereof, the additional
Rights to which such holders shall be entitled as a result of such adjustment,
or, at the option of the Company, shall cause to be distributed to such holders
of record in substitution and replacement for the Right Certificates held by
such holders prior to the date of adjustment, and upon surrender thereof, if
required by the Company, new Right Certificates evidencing all the Rights to
which such holders shall be entitled after such adjustment.  Right Certificates
so to be distributed shall be issued, executed and countersigned in the manner
provided for herein and shall be registered in the names of the holders of
record of Right Certificates on the record date specified in the public
announcement.

                 (j)      Irrespective of any adjustment or change in the
Purchase Price or the number of one one-hundredths of a Preferred Share
issuable upon the exercise of the Rights, the Right Certificates theretofore
and thereafter issued may continue to express the Purchase Price and the number
of one one-hundredths of a Preferred Share which were expressed in the initial
Right Certificates issued hereunder.

                 (k)      Before taking any action that would cause an
adjustment reducing the Purchase Price below one one-hundredth of the then par
value, if any, of the Preferred Shares issuable upon exercise of the Rights,
the Company shall take any corporate action which may, in the opinion of its





                                      -13-
<PAGE>   17
counsel, be necessary in order that the Company may validly and legally issue
fully paid and nonassessable Preferred Shares at such adjusted Purchase Price.

                 (l)      In any case in which this Section 11 shall require
that an adjustment in the Purchase Price be made effective as of a record date
for a specified event, the Company may elect to defer until the occurrence of
such event the issuing to the holder of any Right exercised after such record
date of the Preferred Shares and other capital stock or securities of the
Company, if any, issuable upon such exercise over and above the Preferred
Shares and other capital stock or securities of the Company, if any, issuable
upon such exercise on the basis of the Purchase Price in effect prior to such
adjustment; provided, however, that the Company shall deliver to such holder a
due bill or other appropriate instrument evidencing such holder's right to
receive such additional shares upon the occurrence of the event requiring such
adjustment.

                 (m)      Anything in this Section 11 to the contrary
notwithstanding, the Company shall be entitled to make such reductions in the
Purchase Price, in addition to those adjustments expressly required by this
Section 11, as and to the extent that it in its sole discretion shall determine
to be advisable in order that any consolidation or subdivision of the Preferred
Shares, issuance wholly for cash of any Preferred Shares at less than the
current market price, issuance wholly for cash of Preferred Shares or
securities which by their terms are convertible into or exchangeable for
Preferred Shares, dividends on Preferred Shares payable in Preferred Shares or
issuance of rights, options or warrants referred to hereinabove in Section
11(b), hereafter made by the Company to holders of its Preferred Shares shall
not be taxable to such stockholders.

                 (n)      In the event that at any time after the date of this
Agreement and prior to the Distribution Date, the Company shall (i) declare or
pay any dividend on the Common Shares payable in Common Shares or (ii) effect a
subdivision, combination or consolidation of the Common Shares (by
reclassification or otherwise than by payment of dividends in Common Shares)
into a greater or lesser number of Common Shares, then in any such case (A) the
number of one one-hundredths of a Preferred Share purchasable after such event
upon proper exercise of each Right shall be determined by multiplying the
number of one one-hundredths of a Preferred Share so purchasable immediately
prior to such event by a fraction, the numerator of which is the number of
Common Shares outstanding immediately before such event and the denominator of
which is the number of Common Shares outstanding immediately after such event,
and (B) each Common Share outstanding immediately after such event shall have
issued with respect to it that number of Rights which each Common Share
outstanding immediately prior to such event had issued with respect to it.  The
adjustments provided for in this Section 11(n) shall be made successively
whenever such a dividend is declared or paid or such a subdivision, combination
or consolidation is effected.

         Section 12.  CERTIFICATE OF ADJUSTED PURCHASE PRICE OR NUMBER OF
SHARES.  Whenever an adjustment is made as provided in Section 11 or 13 hereof,
the Company shall promptly (a) prepare a certificate setting forth such
adjustment, and a brief statement of the facts accounting for such adjustment,
(b) file with the Rights Agent and with each transfer agent for the Common
Shares or the Preferred Shares a copy of such certificate and (c) mail a brief
summary thereof to each holder of a Right Certificate in accordance with
Section 25 hereof.





                                      -14-
<PAGE>   18
         Section 13.  CONSOLIDATION, MERGER OR SALE OR TRANSFER OF ASSETS OR
EARNING POWER.  In the event, directly or indirectly, at any time after a
Person has become an Acquiring Person, (a) the Company shall consolidate with,
or merge with and into, any other Person, (b) any Person shall consolidate with
the Company, or merge with and into the Company and the Company shall be the
continuing or surviving corporation of such merger and, in connection with such
merger, all or part of the Common Shares shall be changed into or exchanged for
stock or other securities of any other Person (or the Company) or cash or any
other property, or (c) the Company shall sell or otherwise transfer (or one or
more of its Subsidiaries shall sell or otherwise transfer), in one or more
transactions, assets or earning power aggregating 50% or more of the assets or
earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person other than the Company or one or more of its wholly-owned
Subsidiaries, then, and in each such case, proper provision shall be made so
that (i) each holder of a Right (except as otherwise provided herein) shall
thereafter have the right to receive, upon the exercise thereof at a price
equal to the then current Purchase Price multiplied by the number of one
one-hundredths of a Preferred Share for which a Right is then exercisable, in
accordance with the terms of this Agreement and in lieu of Preferred Shares,
such number of Common Shares of such other Person (including the Company as
successor thereto or as the surviving corporation) as shall equal the result
obtained by (A) multiplying the then current Purchase Price by the number of
one one-hundredths of a Preferred Share for which a Right is then exercisable
and dividing that product by (B) 50% of the then current per share market price
of the Common Shares of such other Person (determined pursuant to Section 11(d)
hereof) on the date of consummation of such consolidation, merger, sale or
transfer; (ii) the issuer of such Common Shares shall thereafter be liable for,
and shall assume, by virtue of such consolidation, merger, sale or transfer,
all the obligations and duties of the Company pursuant to this Agreement; (iii)
the term "Company" shall thereafter be deemed to refer to such issuer; and (iv)
such issuer shall take such steps (including, but not limited to, the
reservation of a sufficient number of its Common Shares in accordance with
Section 9 hereof) in connection with such consummation as may be necessary to
assure that the provisions hereof shall thereafter be applicable, as nearly as
reasonably may be, in relation to the Common Shares thereafter deliverable upon
the exercise of the Rights.  The Company shall not consummate any such
consolidation, merger, sale or transfer unless prior thereto the Company and
such issuer shall have executed and delivered to the Rights Agent a
supplemental agreement so providing.  The Company shall not enter into any
transaction of the kind referred to in this Section 13 if at the time of such
transaction there are any rights, warrants, instruments or securities
outstanding or any agreements or arrangements which, as a result of the
consummation of such transaction, would eliminate or substantially diminish the
benefits intended to be afforded by the Rights.  The provisions of this Section
13 shall similarly apply to successive mergers or consolidations or sales or
other transfers.

         Section 14.  FRACTIONAL RIGHTS AND FRACTIONAL SHARES.

                 (a)      The Company shall not be required to issue fractions
of Rights or to distribute Right Certificates which evidence fractional Rights.
In lieu of such fractional Rights, there shall be paid to the registered
holders of the Right Certificates with regard to which such fractional Rights
would otherwise be issuable, an amount in cash equal to the same fraction of
the current market value of a whole Right.  For the purposes of this Section
14(a), the current market value of a whole Right shall be the closing price of
the Rights for the Trading Day immediately prior to the date on which such
fractional





                                      -15-
<PAGE>   19
Rights would have been otherwise issuable.  The closing price for any day shall
be the last sale price, regular way, or, in case no such sale takes place on
such day, the average of the closing bid and asked prices, regular way, in
either case as reported in the principal consolidated transaction reporting
system with respect to securities listed or admitted to trading on the New York
Stock Exchange or, if the Rights are not listed or admitted to trading on the
New York Stock Exchange, as reported in the principal consolidated transaction
reporting system with respect to securities listed on the principal national
securities exchange on which the Rights are listed or admitted to trading or,
if the Rights are not listed or admitted to trading on any national securities
exchange, the last quoted price or, if not so quoted, the average of the high
bid and low asked prices in the over-the-counter market, as reported by NASDAQ
or such other system then in use or, if on any such date the Rights are not
quoted by any such organization, the average of the closing bid and asked
prices as furnished by a professional market maker making a market in the
Rights selected by the Board of Directors of the Company.  If on any such date
no such market maker is making a market in the Rights, the fair value of the
Rights on such date as determined in good faith by the Board of Directors of
the Company shall be used.

                 (b)      The Company shall not be required to issue fractions
of Preferred Shares (other than fractions which are integral multiples of one
one-hundredth of a Preferred Share) upon exercise of the Rights or to
distribute certificates which evidence fractional Preferred Shares (other than
fractions which are integral multiples of one one-hundredth of a Preferred
Share).  Fractions of Preferred Shares in integral multiples of one
one-hundredth of a Preferred Share may, at the election of the Company, be
evidenced by depositary receipts, pursuant to an appropriate agreement between
the Company and a depositary selected by it; provided, that such agreement
shall provide that the holders of such depositary receipts shall have all the
rights, privileges and preferences to which they are entitled as beneficial
owners of the Preferred Shares represented by such depositary receipts.  In
lieu of fractional Preferred Shares that are not integral multiples of one
one-hundredth of a Preferred Share, the Company shall pay to the registered
holders of Right Certificates at the time such Rights are exercised as herein
provided an amount in cash equal to the same fraction of the current market
value of one Preferred Share.  For the purposes of this Section 14(b), the
current market value of a Preferred Share shall be the closing price of a
Preferred Share (as determined pursuant to the second sentence of Section
11(d)(i) hereof) for the Trading Day immediately prior to the date of such
exercise.

                 (c)      The holder of a Right by the acceptance of the Right
expressly waives his right to receive any fractional Rights or any fractional
shares upon exercise of a Right (except as provided above).

         Section 15.  RIGHTS OF ACTION.  All rights of action in respect of
this Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Right
Certificates (and, prior to the Distribution Date, the registered holders of
the Common Shares); and any registered holder of any Right Certificate (or,
prior to the Distribution Date, of the Common Shares), without the consent of
the Rights Agent or of the holder of any other Right Certificate (or, prior to
the Distribution Date, of the Common Shares), may, in his own behalf and for
his own benefit, enforce, and may institute and maintain any suit, action or
proceeding against the Company to enforce, or otherwise act in respect of, his
right to exercise the Rights evidenced by such Right Certificate in the manner
provided in such Right Certificate and in this Agreement.  Without





                                      -16-
<PAGE>   20
limiting the foregoing or any remedies available to the holders of Rights, it
is specifically acknowledged that the holders of Rights would not have an
adequate remedy at law for any breach of this Agreement and will be entitled to
specific performance of the obligations under, and injunctive relief against
actual or threatened violations of the obligations of any Person subject to,
this Agreement.

         Section 16.  AGREEMENT OF RIGHT HOLDERS.  Every holder of a Right, by
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

                 (a)      prior to the Distribution Date, the Rights will be
transferable only in connection with the transfer of the Common Shares;

                 (b)      after the Distribution Date, the Right Certificates
are transferable only on the registry books of the Rights Agent if surrendered
at the principal office of the Rights Agent, duly endorsed or accompanied by a
proper instrument of transfer; and

                 (c)      the Company and the Rights Agent may deem and treat
the person in whose name the Right Certificate (or, prior to the Distribution
Date, the associated Common Shares certificate) is registered as the absolute
owner thereof and of the Rights evidenced thereby (notwithstanding any
notations of ownership or writing on the Right Certificates or the associated
Common Shares certificate made by anyone other than the Company or the Rights
Agent) for all purposes whatsoever, and neither the Company nor the Rights
Agent shall be affected by any notice to the contrary.

         Section 17.  RIGHT CERTIFICATE HOLDER NOT DEEMED A STOCKHOLDER.  No
holder, as such, of any Right Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Preferred Shares or
any other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a stockholder of the Company or any
right to vote for the election of directors or upon any matter submitted to
stockholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
stockholders (except as provided in Section 25 hereof), or to receive dividends
or subscription rights, or otherwise, until the Right or Rights evidenced by
such Right Certificate shall have been exercised in accordance with the
provisions hereof.

         Section 18.  CONCERNING THE RIGHTS AGENT.  The Company agrees to pay
to the Rights Agent reasonable compensation for all services rendered by it
hereunder and, from time to time, on demand of the Rights Agent, its reasonable
expenses and counsel fees and other disbursements incurred in the
administration and execution of this Agreement and the exercise and performance
of its duties hereunder.  The Company also agrees to indemnify the Rights Agent
for, and to hold it harmless against, any loss, liability, or expense, incurred
without negligence, bad faith or willful misconduct on the part of the Rights
Agent, for anything done or omitted by the Rights Agent in connection with the
acceptance and administration of this Agreement, including the costs and
expenses of defending against any claim of liability in the premises.





                                      -17-
<PAGE>   21
         The Rights Agent shall be protected and shall incur no liability for,
or in respect of any action taken, suffered or omitted by it in connection
with, its administration of this Agreement in reliance upon any Right
Certificate or certificate for the Preferred Shares or Common Shares or for
other securities of the Company, instrument of assignment or transfer, power of
attorney, endorsement, affidavit, letter, notice, direction, consent,
certificate, statement, or other paper or document believed by it to be genuine
and to be signed, executed and, where necessary, verified or acknowledged, by
the proper person or persons, or otherwise upon the advice of counsel as set
forth in Section 20 hereof.

         Section 19.  MERGER OR CONSOLIDATION OR CHANGE OF NAME OF RIGHTS
AGENT.  Any corporation into which the Rights Agent or any successor Rights
Agent may be merged or with which it may be consolidated, or any corporation
resulting from any merger or consolidation to which the Rights Agent or any
successor Rights Agent shall be a party, or any corporation succeeding to the
stock transfer or corporate trust powers of the Rights Agent or any successor
Rights Agent, shall be the successor to the Rights Agent under this Agreement
without the execution or filing of any paper or any further act on the part of
any of the parties hereto; provided, that such corporation would be eligible
for appointment as a successor Rights Agent under the provisions of Section 21
hereof.  In case at the time such successor Rights Agent shall succeed to the
agency created by this Agreement, any of the Right Certificates shall have been
countersigned but not delivered, any such successor Rights Agent may adopt the
countersignature of the predecessor Rights Agent and deliver such Right
Certificates so countersigned; and in case at that time any of the Right
Certificates shall not have been countersigned, any successor Rights Agent may
countersign such Right Certificates either in the name of the predecessor
Rights Agent or in the name of the successor Rights Agent; and in all such
cases such Right Certificates shall have the full force provided in the Right
Certificates and in this Agreement.

         In case at any time the name of the Rights Agent shall be changed and
at such time any of the Right Certificates shall have been countersigned but
not delivered, the Rights Agent may adopt the countersignature under its prior
name and deliver Right Certificates so countersigned; and in case at that time
any of the Right Certificates shall not have been countersigned, the Rights
Agent may countersign such Right Certificates either in its prior name or in
its changed name; and in all such cases such Right Certificates shall have the
full force provided in the Right Certificates and in this Agreement.

         Section 20.  DUTIES OF RIGHTS AGENT.  The Rights Agent undertakes the
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Right Certificates,
by their acceptance thereof, shall be bound:

                 (a)      The Rights Agent may consult with legal counsel (who
may be legal counsel for the Company), and the opinion of such counsel shall be
full and complete authorization and protection to the Rights Agent as to any
action taken or omitted by it in good faith and in accordance with such
opinion.

                 (b)      Whenever in the performance of its duties under this
Agreement the Rights Agent shall deem it necessary or desirable that any fact
or matter be proved or established by the Company prior to taking or suffering
any action hereunder, such fact or matter (unless other evidence in respect
thereof be herein specifically prescribed) may be deemed to be conclusively
proved and established by





                                      -18-
<PAGE>   22
a certificate signed by any one of the Chairman of the Board, the Chief
Executive Officer, the President, any Vice President, the Treasurer or the
Secretary of the Company and delivered to the Rights Agent; and such
certificate shall be full authorization to the Rights Agent for any action
taken or suffered in good faith by it under the provisions of this Agreement in
reliance upon such certificate.

                 (c)      The Rights Agent shall be liable hereunder to the
Company and any other Person only for its own negligence, bad faith or willful
misconduct.

                 (d)      The Rights Agent shall not be liable for or by reason
of any of the statements of fact or recitals contained in this Agreement or in
the Right Certificates (except its countersignature thereof) or be required to
verify the same, but all such statements and recitals are and shall be deemed
to have been made by the Company only.

                 (e)      The Rights Agent shall not be under any
responsibility in respect of the validity of this Agreement or the execution
and delivery hereof (except the due execution hereof by the Rights Agent) or in
respect of the validity or execution of any Right Certificate (except its
countersignature thereof); nor shall it be responsible for any breach by the
Company of any covenant or condition contained in this Agreement or in any
Right Certificate; nor shall it be responsible for any change in the
exercisability of the Rights (including the Rights becoming void pursuant to
Section 11(a)(ii) hereof) or any adjustment in the terms of the Rights
(including the manner, method or amount thereof) provided for in Section 3, 11,
13, 23 or 24, or the ascertaining of the existence of facts that would require
any such change or adjustment (except with respect to the exercise of Rights
evidenced by Right Certificates after actual notice that such change or
adjustment is required); nor shall it by any act hereunder be deemed to make
any representation or warranty as to the authorization or reservation of any
Preferred Shares to be issued pursuant to this Agreement or any Right
Certificate or as to whether any Preferred Shares will, when issued, be validly
authorized and issued, fully paid and nonassessable.

                 (f)      The Company agrees that it will perform, execute,
acknowledge and deliver or cause to be performed, executed, acknowledged and
delivered all such further and other acts, instruments and assurances as may
reasonably be required by the Rights Agent for the carrying out or performing
by the Rights Agent of the provisions of this Agreement.

                 (g)      The Rights Agent is hereby authorized and directed to
accept instructions with respect to the performance of its duties hereunder
from any one of the Chairman of the Board, the Chief Executive Officer, the
President, any Vice President, the Secretary or the Treasurer of the Company,
and to apply to such officers for advice or instructions in connection with its
duties, and it shall not be liable for any action taken or suffered by it in
good faith in accordance with instructions of any such officer or for any delay
in acting while waiting for those instructions.

                 (h)      The Rights Agent and any stockholder, director,
officer or employee of the Rights Agent may buy, sell or deal in any of the
Rights or other securities of the Company or become pecuniarily interested in
any transaction in which the Company may be interested, or contract with or
lend money to the Company or otherwise act as fully and freely as though it
were not Rights Agent under





                                      -19-
<PAGE>   23
this Agreement.  Nothing herein shall preclude the Rights Agent from acting in
any other capacity for the Company or for any other legal entity.

                 (i)      The Rights Agent may execute and exercise any of the
rights or powers hereby vested in it or perform any duty hereunder either
itself or by or through its attorneys or agents, and the Rights Agent shall not
be answerable or accountable for any act, default, neglect or misconduct of any
such attorneys or agents or for any loss to the Company resulting from any such
act, default, neglect or misconduct, provided reasonable care was exercised in
the selection and continued employment thereof.

         Section 21.  CHANGE OF RIGHTS AGENT.  The Rights Agent or any
successor Rights Agent may resign and be discharged from its duties under this
Agreement upon 30 days' notice in writing mailed to the Company and to each
transfer agent of the Common Shares or Preferred Shares by registered or
certified mail, and to the holders of the Right Certificates by first-class
mail.  The Company may remove the Rights Agent or any successor Rights Agent
upon 30 days' notice in writing, mailed to the Rights Agent or successor Rights
Agent, as the case may be, and to each transfer agent of the Common Shares or
Preferred Shares by registered or certified mail, and to the holders of the
Right Certificates by first-class mail.  If the Rights Agent shall resign or
be removed or shall otherwise become incapable of acting, the Company shall
appoint a successor to the Rights Agent.  If the Company shall fail to make
such appointment within a period of 30 days after giving notice of such removal
or after it has been notified in writing of such resignation or incapacity by
the resigning or incapacitated Rights Agent or by the holder of a Right
Certificate (who shall, with such notice, submit his Right Certificate for
inspection by the Company), then the registered holder of any Right Certificate
may apply to any court of competent jurisdiction for the appointment of a new
Rights Agent.  Any successor Rights Agent, whether appointed by the Company or
by such a court, shall be a corporation organized and doing business under the
laws of the United States or of any state of the United States, in good
standing, which is authorized under such laws to exercise corporate trust or
stock transfer powers and is subject to supervision or examination by federal
or state authority and which has at the time of its appointment as Rights Agent
a combined capital and surplus of at least $50 million.  After appointment, the
successor Rights Agent shall be vested with the same powers, rights, duties and
responsibilities as if it had been originally named as Rights Agent without
further act or deed; but the predecessor Rights Agent shall deliver and
transfer to the successor Rights Agent any property at the time held by it
hereunder, and execute and deliver any further assurance, conveyance, act or
deed necessary for the purpose.  Not later than the effective date of any such
appointment the Company shall file notice thereof in writing with the
predecessor Rights Agent and each transfer agent of the Common Shares or
Preferred Shares, and mail a notice thereof in writing to the registered
holders of the Right Certificates.  Failure to give any notice provided for in
this Section 21, however, or any defect therein, shall not affect the legality
or validity of the resignation or removal of the Rights Agent or the
appointment of the successor Rights Agent, as the case may be.

         Section 22.  ISSUANCE OF NEW RIGHT CERTIFICATES.  Notwithstanding any
of the provisions of this Agreement or of the Rights to the contrary, the
Company may, at its option, issue new Right Certificates evidencing Rights in
such form as may be approved by its Board of Directors to reflect any
adjustment or change in the Purchase Price and the number or kind or class of
shares or other securities or property purchasable under the Right Certificates
made in accordance with the provisions of this Agreement.





                                      -20-
<PAGE>   24
         Section 23.  REDEMPTION.

                 (a)      The Board of Directors of the Company may, at its
option, at any time prior to such time as any Person becomes an Acquiring
Person, redeem all but not less than all the then outstanding Rights at a
redemption price of $.001 per Right, appropriately adjusted to reflect any
stock split, stock dividend or similar transaction occurring after the date
hereof (such redemption price being hereinafter referred to as the "Redemption
Price").  The redemption of the Rights by the Board of Directors may be made
effective at such time, on such basis and with such conditions as the Board of
Directors in its sole discretion may establish.

                 (b)      Immediately upon the action of the Board of Directors
of the Company ordering the redemption of the Rights pursuant to paragraph (a)
of this Section 23, and without any further action and without any notice, the
right to exercise the Rights will terminate and the only right thereafter of
the holders of Rights shall be to receive the Redemption Price.  The Company
shall promptly give public notice of any such redemption; provided, however,
that the failure to give, or any defect in, any such notice shall not affect
the validity of such redemption.  Within 10 days after such action of the Board
of Directors ordering the redemption of the Rights, the Company shall mail a
notice of redemption to all the holders of the then outstanding Rights at their
last addresses as they appear upon the registry books of the Rights Agent or,
prior to the Distribution Date, on the registry books of the transfer agent for
the Common Shares.  Any notice which is mailed in the manner herein provided
shall be deemed given, whether or not the holder receives the notice.  Each
such notice of redemption will state the method by which the payment of the
Redemption Price will be made.  Neither the Company nor any of its Affiliates
or Associates may redeem, acquire or purchase for value any Rights at any time
in any manner other than that specifically set forth in this Section 23 or in
Section 24 hereof, and other than in connection with the purchase of Common
Shares prior to the Distribution Date.

                 (c)      Notwithstanding the provisions of Section 23(a), in
the event that a majority of the Board of Directors of the Company is elected
by stockholder action by written consent, then until the earlier to occur of
(i) the 180th day following the effectiveness of such election or (ii) the next
regular annual meeting of stockholders of the Company following the
effectiveness of such election (including any postponement or adjournment
thereof), the Rights shall not be redeemed if such redemption is reasonably
likely to have the purpose or effect of facilitating a Transaction with an
Interested Person.

         Section 24.  EXCHANGE.

                 (a)      The Board of Directors of the Company may, at its
option, at any time after any Person becomes an Acquiring Person, exchange all
or part of the then outstanding and exercisable Rights (which shall not include
Rights that have become void pursuant to the provisions of Section 11(a)(ii)
hereof) for Common Shares at an exchange ratio of one Common Share per Right,
appropriately adjusted to reflect any stock split, stock dividend or similar
transaction occurring after the date hereof (such exchange ratio being
hereinafter referred to as the "Exchange Ratio").  Notwithstanding the
foregoing, the Board of Directors shall not be empowered to effect such
exchange at any time after any Person (other than the Company, any Subsidiary
of the Company, any employee benefit plan of the Company





                                      -21-
<PAGE>   25
or any such Subsidiary, or any entity holding Common Shares for or pursuant to
the terms of any such plan), together with all Affiliates and Associates of
such Person, becomes the Beneficial Owner of 50% or more of the Common Shares
then outstanding.

                 (b)      Immediately upon the action of the Board of Directors
of the Company ordering the exchange of any Rights pursuant to paragraph (a) of
this Section 24 and without any further action and without any notice, the
right to exercise such Rights shall terminate and the only right thereafter of
a holder of such Rights shall be to receive that number of Common Shares equal
to the number of such Rights held by such holder multiplied by the Exchange
Ratio.  The Company shall promptly give public notice of any such exchange;
provided, however, that the failure to give, or any defect in, such notice
shall not affect the validity of such exchange.  The Company promptly shall
mail a notice of any such exchange to all of the holders of such Rights at
their last addresses as they appear upon the registry books of the Rights
Agent.  Any notice which is mailed in the manner herein provided shall be
deemed given, whether or not the holder receives the notice.  Each such notice
of exchange will state the method by which the exchange of the Common Shares
for Rights will be effected and, in the event of any partial exchange, the
number of Rights which will be exchanged.  Any partial exchange shall be
effected pro rata based on the number of Rights (other than Rights which have
become void pursuant to the provisions of Section 11(a)(ii) hereof) held by
each holder of Rights.

                 (c)      In the event that there shall not be sufficient
Common Shares issued but not outstanding or authorized but unissued to permit
any exchange of Rights as contemplated in accordance with this Section 24, the
Company shall take all such action as may be necessary to authorize additional
Common Shares for issuance upon exchange of the Rights.  In the event the
Company shall, after good faith effort, be unable to take all such action as
may be necessary to authorize such additional Common Shares, the Company shall
substitute, for each Common Share that would otherwise be issuable upon
exchange of a Right, a number of Preferred Shares or fraction thereof such that
the current per share market price of one Preferred Share multiplied by such
number or fraction is equal to the current per share market price of one Common
Share as of the date of issuance of such Preferred Shares or fraction thereof.

                 (d)      The Company shall not be required to issue fractions
of Common Shares or to distribute certificates which evidence fractional Common
Shares.  In lieu of such fractional Common Shares, the Company shall pay to the
registered holders of the Right Certificates with regard to which such
fractional Common Shares would otherwise be issuable an amount in cash equal to
the same fraction of the current market value of a whole Common Share.  For the
purposes of this paragraph (d), the current market value of a whole Common
Share shall be the closing price of a Common Share (as determined pursuant to
the second sentence of Section 11(d)(i) hereof) for the Trading Day immediately
prior to the date of exchange pursuant to this Section 24.

         Section 25.  NOTICE OF CERTAIN EVENTS.

                 (a)      In case the Company shall propose (i) to pay any
dividend payable in stock of any class to the holders of its Preferred Shares
or to make any other distribution to the holders of its Preferred Shares (other
than a regular quarterly cash dividend), (ii) to offer to the holders of its
Preferred Shares





                                      -22-
<PAGE>   26
rights or warrants to subscribe for or to purchase any additional Preferred
Shares or shares of stock of any class or any other securities, rights or
options, (iii) to effect any reclassification of its Preferred Shares (other
than a reclassification involving only the subdivision of outstanding Preferred
Shares), (iv) to effect any consolidation or merger into or with, or to effect
any sale or other transfer (or to permit one or more of its Subsidiaries to
effect any sale or other transfer), in one or more transactions, of 50% or more
of the assets or earning power of the Company and its Subsidiaries (taken as a
whole) to, any other Person, (v) to effect the liquidation, dissolution or
winding up of the Company, or (vi) to declare or pay any dividend on the Common
Shares payable in Common Shares or to effect a subdivision, combination or
consolidation of the Common Shares (by reclassification or otherwise than by
payment of dividends in Common Shares), then, in each such case, the Company
shall give to each holder of a Right Certificate, in accordance with Section 26
hereof, a notice of such proposed action, which shall specify the record date
for the purposes of such stock dividend, or distribution of rights or warrants,
or the date on which such reclassification, consolidation, merger, sale,
transfer, liquidation, dissolution, or winding up is to take place and the date
of participation therein by the holders of the Common Shares and/or Preferred
Shares, if any such date is to be fixed, and such notice shall be so given in
the case of any action covered by clause (i) or (ii) above at least 10 days
prior to the record date for determining holders of the Preferred Shares for
purposes of such action, and in the case of any such other action, at least 10
days prior to the date of the taking of such proposed action or the date of
participation therein by the holders of the Common Shares and/or Preferred
Shares, whichever shall be the earlier.

                 (b)      In case the event set forth in Section 11(a)(ii)
hereof shall occur, then the Company shall as soon as practicable thereafter
give to each holder of a Right Certificate, in accordance with Section 26
hereof, a notice of the occurrence of such event, which notice shall describe
such event and the consequences of such event to holders of Rights under
Section 11(a)(ii) hereof.

         Section 26.  NOTICES.  Notices or demands authorized by this Agreement
to be given or made by the Rights Agent or by the holder of any Right
Certificate to or on the Company shall be sufficiently given or made if sent by
first-class mail, postage prepaid, addressed (until another address is filed in
writing with the Rights Agent) as follows:

                          Octel Communications Corporation
                          1001 Murphy Ranch Road
                          Milpitas, California  95035-7912
                          Attention:  Chief Financial Officer

Subject to the provisions of Section 21 hereof, any notice or demand authorized
by this Agreement to be given or made by the Company or by the holder of any
Right Certificate to or on the Rights Agent shall be sufficiently given or made
if sent by first-class mail, postage prepaid, addressed (until another address
is filed in writing with the Company) as follows:

                          The First National Bank of Boston
                          435 Tasso Street, Suite 250
                          Palo Alto, California  94301
                          Attention:  Geoff Anderson





                                      -23-
<PAGE>   27
Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Right Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

       Section 27.  SUPPLEMENTS AND AMENDMENTS.

               (a)        The Company may from time to time supplement or amend
this Agreement without the approval of any holders of Right Certificates in
order to cure any ambiguity, to correct or supplement any provision contained
herein which may be defective or inconsistent with any other provisions herein,
or to make any other provisions with respect to the Rights which the Company
may deem necessary or desirable, any such supplement or amendment to be
evidenced by a writing signed by the Company and the Rights Agent; provided,
however, that from and after such time as any Person becomes an Acquiring
Person, this Agreement shall not be amended in any manner which would adversely
affect the interests of the holders of Rights.  Without limiting the foregoing,
the Company may at any time prior to such time as any Person becomes an
Acquiring Person amend this Agreement to lower the thresholds set forth in
Sections 1(a) and 3(a) to not less than the greater of (i) the sum of .001% and
the largest percentage of the outstanding Common Shares then known by the
Company to be beneficially owned by any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or any
Subsidiary of the Company, or any entity holding Common Shares for or pursuant
to the terms of any such plan) and (ii) 10%.

               (b)        Notwithstanding the provisions of Section 27(a), in
the event that a majority of the Board of Directors of the Company is elected
by stockholder action by written consent, then until the earlier to occur of
(i) the 180th day following the effectiveness of such election or (ii) the next
regular annual meeting of stockholders of the Company following the
effectiveness of such election (including any postponement or adjournment
thereof), this Rights Agreement shall not be supplemented or amended in any
manner reasonably likely to have the purpose or effect of facilitating a
Transaction with an Interested Person.

         Section 28.  SUCCESSORS.  All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

         Section 29.  BENEFITS OF THIS AGREEMENT.  Nothing in this Agreement
shall be construed to give to any person or corporation other than the Company,
the Rights Agent and the registered holders of the Right Certificates (and,
prior to the Distribution Date, the Common Shares) any legal or equitable
right, remedy or claim under this Agreement; but this Agreement shall be for
the sole and exclusive benefit of the Company, the Rights Agent and the
registered holders of the Right Certificates (and, prior to the Distribution
Date, the Common Shares).

         Section 30.  SEVERABILITY.  If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder





                                      -24-
<PAGE>   28
of the terms, provisions, covenants and restrictions of this Agreement shall
remain in full force and effect and shall in no way be affected, impaired or
invalidated.

         Section 31.  GOVERNING LAW.  This Agreement and each Right Certificate
issued hereunder shall be deemed to be a contract made under the laws of the
State of Delaware and for all purposes shall be governed by and construed in
accordance with the laws of such State applicable to contracts to be made and
performed entirely within such State.

         Section 32.  COUNTERPARTS.  This Agreement may be executed in any
number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute
but one and the same instrument.

         Section 33.  DESCRIPTIVE HEADINGS.  Descriptive headings of the
several Sections of this Agreement are inserted for convenience only and shall
not control or affect the meaning or construction of any of the provisions
hereof.





                                      -25-
<PAGE>   29
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed and attested, all as of the day and year first above written.


ATTEST:                                  OCTEL COMMUNICATIONS CORPORATION


By /s/ DEREK S. DALEY                    By /s/ ROBERT COHN
   -------------------------------          ------------------------------------
   Title: Vice President, General           Title: Chairman of the Board and CEO
             Counsel and Corporate
             Secretary


ATTEST:                                  THE FIRST NATIONAL BANK OF BOSTON


By /s/ DENNIS E. ROY                     By /s/ GEOFFREY D. ANDERSON
   -------------------------------          ------------------------------------
   Title:                                   Title:





                                      -26-
<PAGE>   30

                                                                       EXHIBIT A

                                      FORM

                                       OF

                          CERTIFICATE OF DESIGNATIONS

                                       OF

                 SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                       OF

                        OCTEL COMMUNICATIONS CORPORATION

                        (PURSUANT TO SECTION 151 OF THE
                       DELAWARE GENERAL CORPORATION LAW)

                         ______________________________


                 Octel Communications Corporation, a corporation organized and
existing under the General Corporation Law of the State of Delaware
(hereinafter called the "Corporation"), hereby certifies that the following
resolution was adopted by the Board of Directors of the Corporation as required
by Section 151 of the General Corporation Law at a meeting duly called and held
on April 30, 1997:

                 RESOLVED, that pursuant to the authority granted to and vested
in the Board of Directors of this Corporation (hereinafter called the "Board of
Directors" or the "Board") in accordance with the provisions of the Certificate
of Incorporation, the Board of Directors hereby creates a series of Preferred
Stock, par value $.001 per share (the "Preferred Stock"), of the Corporation
and hereby states the designation and number of shares, and fixes the relative
rights, preferences, and limitations thereof as follows:

                 SERIES A JUNIOR PARTICIPATING PREFERRED STOCK:

                 Section 1.  DESIGNATION AND AMOUNT.  The shares of such series
shall be designated as "Series A Junior Participating Preferred Stock" (the
"Series A Preferred Stock") and the number of shares constituting the Series A
Preferred Stock shall be two million (2,000,000).  Such number of shares may be
increased or decreased by resolution of the Board of Directors; provided, that
no decrease shall reduce the number of shares of Series A Preferred Stock to a
number less than the number of shares then





<PAGE>   31
outstanding plus the number of shares reserved for issuance upon the exercise
of outstanding options, rights or warrants or upon the conversion of any
outstanding securities issued by the Corporation convertible into Series A
Preferred Stock.

                 Section 2.  DIVIDENDS AND DISTRIBUTIONS.

                 (A)      Subject to the rights of the holders of any shares of
         any series of Preferred Stock (or any similar stock) ranking prior and
         superior to the Series A Preferred Stock with respect to dividends,
         the holders of shares of Series A Preferred Stock, in preference to
         the holders of Common Stock, par value $.001 per share (the "Common
         Stock"), of the Corporation, and of any other junior stock, shall be
         entitled to receive, when, as and if declared by the Board of
         Directors out of funds legally available for the purpose, quarterly
         dividends payable in cash on the first day of March, June, September
         and December in each year (each such date being referred to herein as
         a "Quarterly Dividend Payment Date"), commencing on the first
         Quarterly Dividend Payment Date after the first issuance of a share or
         fraction of a share of Series A Preferred Stock, in an amount per
         share (rounded to the nearest cent) equal to the greater of (a) $1 or
         (b) subject to the provision for adjustment hereinafter set forth, 100
         times the aggregate per share amount of all cash dividends, and 100
         times the aggregate per share amount (payable in kind) of all non-cash
         dividends or other distributions, other than a dividend payable in
         shares of Common Stock or a subdivision of the outstanding shares of
         Common Stock (by reclassification or otherwise), declared on the
         Common Stock since the immediately preceding Quarterly Dividend
         Payment Date or, with respect to the first Quarterly Dividend Payment
         Date, since the first issuance of any share or fraction of a share of
         Series A Preferred Stock.  In the event the Corporation shall at any
         time declare or pay any dividend on the Common Stock payable in shares
         of Common Stock, or effect a subdivision or combination or
         consolidation of the outstanding shares of Common Stock (by
         reclassification or otherwise than by payment of a dividend in shares
         of Common Stock) into a greater or lesser number of shares of Common
         Stock, then in each such case the amount to which holders of shares of
         Series A Preferred Stock were entitled immediately prior to such event
         under clause (b) of the preceding sentence shall be adjusted by
         multiplying such amount by a fraction, the numerator of which is the
         number of shares of Common Stock outstanding immediately after such
         event and the denominator of which is the number of shares of Common
         Stock that were outstanding immediately prior to such event.

                 (B)      The Corporation shall declare a dividend or
         distribution on the Series A Preferred Stock as provided in paragraph
         (A) of this Section immediately after it declares a dividend or
         distribution on the Common Stock (other than a dividend payable in
         shares of Common Stock); provided that, in the event no dividend or
         distribution shall have been declared on the Common Stock during the
         period between any Quarterly Dividend Payment Date and the next
         subsequent Quarterly Dividend Payment Date, a dividend of $1 per share
         on the Series A Preferred Stock shall nevertheless be payable on such
         subsequent Quarterly Dividend Payment Date.

                 (C)      Dividends shall begin to accrue and be cumulative on
         outstanding shares of Series A Preferred Stock from the Quarterly
         Dividend Payment Date next preceding the date of issue of such shares,
         unless the date of issue of such shares is prior to the record date
         for the first





                                      A-2
<PAGE>   32
         Quarterly Dividend Payment Date, in which case dividends on such
         shares shall begin to accrue from the date of issue of such shares, or
         unless the date of issue is a Quarterly Dividend Payment Date or is a
         date after the record date for the determination of holders of shares
         of Series A Preferred Stock entitled to receive a quarterly dividend
         and before such Quarterly Dividend Payment Date, in either of which
         events such dividends shall begin to accrue and be cumulative from
         such Quarterly Dividend Payment Date.  Accrued but unpaid dividends
         shall not bear interest.  Dividends paid on the shares of Series A
         Preferred Stock in an amount less than the total amount of such
         dividends at the time accrued and payable on such shares shall be
         allocated pro rata on a share-by-share basis among all such shares at
         the time outstanding.  The Board of Directors may fix a record date
         for the determination of holders of shares of Series A Preferred Stock
         entitled to receive payment of a dividend or distribution declared
         thereon, which record date shall be not more than 60 days prior to the
         date fixed for the payment thereof.

                 Section 3.  VOTING RIGHTS.  The holders of shares of Series A
Preferred Stock shall have the following voting rights:

                 (A)      Subject to the provision for adjustment hereinafter
         set forth, each share of Series A Preferred Stock shall entitle the
         holder thereof to 100 votes on all matters submitted to a vote of the
         stockholders of the Corporation.  In the event the Corporation shall
         at any time declare or pay any dividend on the Common Stock payable in
         shares of Common Stock, or effect a subdivision or combination or
         consolidation of the outstanding shares of Common Stock (by
         reclassification or otherwise than by payment of a dividend in shares
         of Common Stock) into a greater or lesser number of shares of Common
         Stock, then in each such case the number of votes per share to which
         holders of shares of Series A Preferred Stock were entitled
         immediately prior to such event shall be adjusted by multiplying such
         number by a fraction, the numerator of which is the number of shares
         of Common Stock outstanding immediately after such event and the
         denominator of which is the number of shares of Common Stock that were
         outstanding immediately prior to such event.

                 (B)      Except as otherwise provided herein, in any other
         Certificate of Designations creating a series of Preferred Stock or
         any similar stock, or by law, the holders of shares of Series A
         Preferred Stock and the holders of shares of Common Stock and any
         other capital stock of the Corporation having general voting rights
         shall vote together as one class on all matters submitted to a vote of
         stockholders of the Corporation.

                 (C)      Except as set forth herein, or as otherwise provided
         by law, holders of Series A Preferred Stock shall have no special
         voting rights and their consent shall not be required (except to the
         extent they are entitled to vote with holders of Common Stock as set
         forth herein) for taking any corporate action.

                 Section 4.  CERTAIN RESTRICTIONS.

                 (A)      Whenever quarterly dividends or other dividends or
         distributions payable on the Series A Preferred Stock as provided in
         Section 2 are in arrears, thereafter and until all accrued





                                      A-3
<PAGE>   33
         and unpaid dividends and distributions, whether or not declared, on
         shares of Series A Preferred Stock outstanding shall have been paid in
         full, the Corporation shall not:

                          (i)     declare or pay dividends, or make any other
                 distributions, on any shares of stock ranking junior (either
                 as to dividends or upon liquidation, dissolution or winding
                 up) to the Series A Preferred Stock;

                          (ii)    declare or pay dividends, or make any other
                 distributions, on any shares of stock ranking on a parity
                 (either as to dividends or upon liquidation, dissolution or
                 winding up) with the Series A Preferred Stock, except
                 dividends paid ratably on the Series A Preferred Stock and all
                 such parity stock on which dividends are payable or in arrears
                 in proportion to the total amounts to which the holders of all
                 such shares are then entitled;

                          (iii)   redeem or purchase or otherwise acquire for
                 consideration shares of any stock ranking junior (either as to
                 dividends or upon liquidation, dissolution or winding up) to
                 the Series A Preferred Stock, provided that the Corporation
                 may at any time redeem, purchase or otherwise acquire shares
                 of any such junior stock in exchange for shares of any stock
                 of the Corporation ranking junior (either as to dividends or
                 upon dissolution, liquidation or winding up) to the Series A
                 Preferred Stock; or

                          (vi)    redeem or purchase or otherwise acquire for
                 consideration any shares of Series A Preferred Stock, or any
                 shares of stock ranking on a parity with the Series A
                 Preferred Stock, except in accordance with a purchase offer
                 made in writing or by publication (as determined by the Board
                 of Directors) to all holders of such shares upon such terms as
                 the Board of Directors, after consideration of the respective
                 annual dividend rates and other relative rights and
                 preferences of the respective series and classes, shall
                 determine in good faith will result in fair and equitable
                 treatment among the respective series or classes.

                 (B)      The Corporation shall not permit any subsidiary of
         the Corporation to purchase or otherwise acquire for consideration any
         shares of stock of the Corporation unless the Corporation could, under
         paragraph (A) of this Section 4, purchase or otherwise acquire such
         shares at such time and in such manner.

                 Section 5.  REACQUIRED SHARES.  Any shares of Series A
Preferred Stock purchased or otherwise acquired by the Corporation in any
manner whatsoever shall be retired and cancelled promptly after the acquisition
thereof.  All such shares shall upon their cancellation become authorized but
unissued shares of Preferred Stock and may be reissued as part of a new series
of Preferred Stock subject to the conditions and restrictions on issuance set
forth herein, in the Certificate of Incorporation, or in any other Certificate
of Designations creating a series of Preferred Stock or any similar stock or as
otherwise required by law.





                                      A-4
<PAGE>   34
                 Section 6.  LIQUIDATION, DISSOLUTION OR WINDING UP.  Upon any
liquidation, dissolution or winding up of the Corporation, no distribution
shall be made (1) to the holders of shares of stock ranking junior (either as
to dividends or upon liquidation, dissolution or winding up) to the Series A
Preferred Stock unless, prior thereto, the holders of shares of Series A
Preferred Stock shall have received $100 per share, plus an amount equal to
accrued and unpaid dividends and distributions thereon, whether or not
declared, to the date of such payment, provided that the holders of shares of
Series A Preferred Stock shall be entitled to receive an aggregate amount per
share, subject to the provision for adjustment hereinafter set forth, equal to
100 times the aggregate amount to be distributed per share to holders of shares
of Common Stock, or (2) to the holders of shares of stock ranking on a parity
(either as to dividends or upon liquidation, dissolution or winding up) with
the Series A Preferred Stock, except distributions made ratably on the Series A
Preferred Stock and all such parity stock in proportion to the total amounts to
which the holders of all such shares are entitled upon such liquidation,
dissolution or winding up.  In the event the Corporation shall at any time
declare or pay any dividend on the Common Stock payable in shares of Common
Stock, or effect a subdivision or combination or consolidation of the
outstanding shares of Common Stock (by reclassification or otherwise than by
payment of a dividend in shares of Common Stock) into a greater or lesser
number of shares of Common Stock, then in each such case the aggregate amount
to which holders of shares of Series A Preferred Stock were entitled
immediately prior to such event under the proviso in clause (1) of the
preceding sentence shall be adjusted by multiplying such amount by a fraction
the numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

                 Section 7.  CONSOLIDATION, MERGER, ETC.  In case the
Corporation shall enter into any consolidation, merger, combination or other
transaction in which the shares of Common Stock are exchanged for or changed
into other stock or securities, cash and/or any other property, then in any
such case each share of Series A Preferred Stock shall at the same time be
similarly exchanged or changed into an amount per share, subject to the
provision for adjustment hereinafter set forth, equal to 100 times the
aggregate amount of stock, securities, cash and/or any other property (payable
in kind), as the case may be, into which or for which each share of Common
Stock is changed or exchanged.  In the event the Corporation shall at any time
declare or pay any dividend on the Common Stock payable in shares of Common
Stock, or effect a subdivision or combination or consolidation of the
outstanding shares of Common Stock (by reclassification or otherwise than by
payment of a dividend in shares of Common Stock) into a greater or lesser
number of shares of Common Stock, then in each such case the amount set forth
in the preceding sentence with respect to the exchange or change of shares of
Series A Preferred Stock shall be adjusted by multiplying such amount by a
fraction, the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to
such event.

                 Section 8.  NO REDEMPTION.  The shares of Series A Preferred 
Stock shall not be redeemable.

                 Section 9.  RANK.  The Series A Preferred Stock shall rank,
with respect to the payment of dividends and the distribution of assets, junior
to all series of any other class of the Corporation's Preferred Stock.





                                      A-5
<PAGE>   35
                 Section 10.  AMENDMENT.  The Certificate of Incorporation of
the Corporation shall not be amended in any manner which would materially alter
or change the powers, preferences or special rights of the Series A Preferred
Stock so as to affect them adversely without the affirmative vote of the
holders of at least two-thirds of the outstanding shares of Series A Preferred
Stock, voting together as a single class.

                 IN WITNESS WHEREOF, this Certificate of Designations is
executed on behalf of the Corporation by its Chairman of the Board and attested
by its Secretary this 13th day of May, 1997.



                                                   __________________________
                                                   Chairman of the Board


Attest:

______________________________
Secretary





                                      A-6
<PAGE>   36
                                                                       EXHIBIT B


                           FORM OF RIGHT CERTIFICATE


Certificate No. R-                       _____ Rights



NOT EXERCISABLE AFTER MAY 13, 2007 OR EARLIER IF REDEMPTION OR EXCHANGE OCCURS.
                           THE RIGHTS ARE SUBJECT TO
  REDEMPTION AT $.001 PER RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN THE
                               RIGHTS AGREEMENT.


                               RIGHT CERTIFICATE

                        OCTEL COMMUNICATIONS CORPORATION


         This certifies that ____________________, or registered assigns, is
the registered owner of the number of Rights set forth above, each of which
entitles the owner thereof, subject to the terms, provisions and conditions of
the Second Amended and Restated Rights Agreement, dated as of May 13, 1997 (the
"Rights Agreement"), between Octel Communications Corporation (the "Company"),
and The First National Bank of Boston (the "Rights Agent"), to purchase from
the Company at any time after the Distribution Date (as such term is defined in
the Rights Agreement) and prior to 5:00 P.M., New York time, on May 13, 2007 at
the principal office of the Rights Agent, or at the office of its successor as
Rights Agent, one one-hundredth of a fully paid non-assessable share of Series
A Junior Participating Preferred Stock, par value $.001 per share (the
"Preferred Shares"), of the Company, at a purchase price of $100.00 per one
one-hundredth of a Preferred Share (the "Purchase Price"), upon presentation
and surrender of this Right Certificate with the Form of Election to Purchase
duly executed.  The number of Rights evidenced by this Right Certificate (and
the number of one one-hundredths of a Preferred Share which may be purchased
upon exercise hereof) set forth above, and the Purchase Price set forth above,
are the number and Purchase Price as of May 13, 1997, based on the Preferred
Shares as constituted at such date.  As provided in the Rights Agreement, the
Purchase Price and the number of one one-hundredths of a Preferred Share which
may be purchased upon the exercise of the Rights evidenced by this Right
Certificate are subject to modification and adjustment upon the happening of
certain events.

         This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the





<PAGE>   37
rights, limitations of rights, obligations, duties and immunities hereunder of
the Rights Agent, the Company and the holders of the Right Certificates.
Copies of the Rights Agreement are on file at the principal executive offices
of the Company and the above-mentioned offices of the Rights Agent.

         This Right Certificate, with or without other Right Certificates, upon
surrender at the principal office of the Rights Agent, may be exchanged for
another Right Certificate or Right Certificates of like tenor and date
evidencing Rights entitling the holder to purchase a like aggregate number of
Preferred Shares as the Rights evidenced by the Right Certificate or Right
Certificates surrendered shall have entitled such holder to purchase.  If this
Right Certificate shall be exercised in part, the holder shall be entitled to
receive upon surrender hereof another Right Certificate or Right Certificates
for the number of whole Rights not exercised.

         Subject to the provisions of the Rights Agreement, the Rights
evidenced by this Certificate (i) may be redeemed by the Company at a
redemption price of $.001 per Right or (ii) may be exchanged in whole or in
part for Preferred Shares or shares of the Company's Common Stock, par value
$.001 per share; provided, however, in the event that (a) a majority of the
Board of Directors of the Company is elected by stockholder action by written
consent than until the earlier to occur of (i) the 180th day following the
effectiveness of such election or (ii) the next regular annual meeting of
stockholders of the Company following the effectiveness of such election, the
Rights are not redeemable if such redemption is reasonably likely to have the
purpose or effect of facilitating a Transaction with an Interested Person.
"Interested Person" with respect to a Transaction shall mean any person who (i)
is or will become an Acquiring Person (as defined in the Rights Agreement) if
the Transaction were to be consummated or an affiliate or associate of such a
person, and (ii) is, or directly or indirectly proposed, nominated or
financially supported a director of the Company in office at the time of
consideration of the  Transaction in question who was elected by written
consent of stockholders.  "Transaction" means any merger, consolidation or sale
of assets described in Section 13(a) of the Rights Agreement or any acquisition
of Common Shares which would result in a person becoming an Acquiring Person.

         No fractional Preferred Shares will be issued upon the exercise of any
Right or Rights evidenced hereby (other than fractions which are integral
multiples of one one-hundredth of a Preferred Share, which may, at the election
of the Company, be evidenced by depositary receipts), but in lieu thereof a
cash payment will be made, as provided in the Rights Agreement.

         No holder of this Right Certificate shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of the Preferred
Shares or of any other securities of the Company which may at any time be
issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except as
provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Right
Certificate shall have been exercised as provided in the Rights Agreement.





                                      B-2
<PAGE>   38
         This Right Certificate shall not be valid or obligatory for any
purpose until it shall have been countersigned by the Rights Agent.

         WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal.  Dated as of ____________________.

ATTEST:                                    OCTEL COMMUNICATIONS CORPORATION


__________________________________         By_______________________


Countersigned:


THE FIRST NATIONAL BANK OF BOSTON


By________________________________
       Authorized Signature





                                      B-3
<PAGE>   39
                   Form of Reverse Side of Right Certificate

                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Right Certificate.)


         FOR VALUE RECEIVED _______________________________ hereby sells,
assigns and transfers unto _____________________________________________________
________________________________________________________________________________
                 (Please print name and address of transferee)
this Right Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint ____________________
Attorney, to transfer the within Right Certificate on the books of the
within-named Company, with full power of substitution.


Dated:  ______________________, ____



                                        ________________________________________
                                           Signature


Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of
Securities Dealers, Inc., or a commercial bank or trust company having an
office or correspondent in the United States.

- ------------------------------------------------------------
         The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement).



                                            ____________________________________
                                            Signature

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





<PAGE>   40
             Form of Reverse Side of Right Certificate -- continued


                          FORM OF ELECTION TO PURCHASE

                 (To be executed if holder desires to exercise
                 Rights represented by the Right Certificate.)


To:  ___________________

         The undersigned hereby irrevocably elects to exercise
___________________________ Rights represented by this Right Certificate to
purchase the Preferred Shares issuable upon the exercise of such Rights and
requests that certificates for such Preferred Shares be issued in the name of:

Please insert social security
or other identifying number

________________________________________________________________________________
                        (Please print name and address)

________________________________________________________________________________
If such number of Rights shall not be all the Rights evidenced by this Right
Certificate, a new Right Certificate for the balance remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number

________________________________________________________________________________
                        (Please print name and address)

________________________________________________________________________________

Dated:  __________________________


                                            ____________________________________
                                            Signature





<PAGE>   41
Signature Guaranteed:

         Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of
Securities Dealers, Inc., or a commercial bank or trust company having an
office or correspondent in the United States.

             Form of Reverse Side of Right Certificate -- continued

- -------------------------------------------------------------
         The undersigned hereby certifies that the Rights evidenced by this
Right Certificate are not beneficially owned by an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement).

                                       _______________________________________
                                       Signature

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


                                     NOTICE

         The signature in the Form of Assignment or Form of Election to
Purchase, as the case may be, must conform to the name as written upon the face
of this Right Certificate in every particular, without alteration or
enlargement or any change whatsoever.

         In the event the certification set forth above in the Form of
Assignment or the Form of Election to Purchase, as the case may be, is not
completed, the Company and the Rights Agent will deem the beneficial owner of
the Rights evidenced by this Right Certificate to be an Acquiring Person or an
Affiliate or Associate thereof (as defined in the Rights Agreement) and such
Assignment or Election to Purchase will not be honored.





<PAGE>   42

                                                                       EXHIBIT C

                         SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES


         Pursuant to the Rights Agreement dated as of July 25, 1990 and amended
and restated as of August 29, 1996 and May 13, 1997 (the "Rights Agreement")
between Octel Communications Corporation (the "Company") and The First National
Bank of Boston, as Rights Agent (the "Rights Agent"), the Board of Directors of
the Company declared a dividend of one preferred share purchase right (a
"Right") for each outstanding share of common stock, par value $.001 per share
(the "Common Shares"), of the Company.  Each Right entitles the registered
holder to purchase from the Company one one-hundredth of a share of Series A
Junior Participating Preferred Stock, par value $.001 per share (the "Preferred
Shares"), of the Company at a price of $100 per one one-hundredth of a
Preferred Share (the "Purchase Price"), subject to adjustment.  The description
and terms of the Rights are set forth in the Rights Agreement.

         Until the earlier to occur of (i) 10 days following a public
announcement that a person or group of affiliated or associated persons (an
"Acquiring Person") have acquired beneficial ownership of 20% or more of the
outstanding Common Shares or (ii) 10 business days (or such later date as may
be determined by action of the Board of Directors prior to such time as any
person or group of affiliated persons becomes an Acquiring Person) following
the commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of 20% or more of the outstanding Common Shares
(the earlier of such dates being called the "Distribution Date"), the Rights
will be evidenced, with respect to any of the Common Share certificates
outstanding as of the Record Date, by such Common Share certificate with a copy
of this Summary of Rights attached thereto.

         The Rights Agreement provides that, until the Distribution Date (or
earlier redemption or expiration of the Rights), the Rights will be transferred
with and only with the Common Shares.  Until the Distribution Date (or earlier
redemption or expiration of the Rights), new Common Share certificates issued
after the Record Date upon transfer or new issuance of Common Shares will
contain a notation incorporating the Rights Agreement by reference.  Until the
Distribution Date (or earlier redemption or expiration of the Rights), the
surrender for transfer of any certificates for Common Shares outstanding as of
the Record Date, even without such notation or a copy of this Summary of Rights
being attached thereto, will also constitute the transfer of the Rights
associated with the Common Shares represented by such certificate.  As soon as
practicable following the Distribution Date, separate certificates evidencing
the Rights ("Right Certificates") will be mailed to holders of record of the
Common Shares as of the close of business on the Distribution Date and such
separate Right Certificates alone will evidence the Rights.




<PAGE>   43
         The Rights are not exercisable until the Distribution Date.  The
Rights will expire on May 13, 2007 (the "Final Expiration Date"), unless the
Final Expiration Date is extended or unless the Rights are earlier redeemed or
exchanged by the Company, in each case, as described below.

         The Purchase Price payable, and the number of Preferred Shares or
other securities or property issuable, upon exercise of the Rights are subject
to adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the
Preferred Shares, (ii) upon the grant to holders of the Preferred Shares of
certain rights or warrants to subscribe for or purchase Preferred Shares at a
price, or securities convertible into Preferred Shares with a conversion price,
less than the then-current market price of the Preferred Shares or (iii) upon
the distribution to holders of the Preferred Shares of evidences of
indebtedness or assets (excluding regular periodic cash dividends paid out of
earnings or retained earnings or dividends payable in Preferred Shares) or of
subscription rights or warrants (other than those referred to above).

         The number of outstanding Rights and the number of one one-hundredths
of a Preferred Share issuable upon exercise of each Right are also subject to
adjustment in the event of a stock split of the Common Shares or a stock
dividend on the Common Shares payable in Common Shares or subdivisions,
consolidations or combinations of the Common Shares occurring, in any such
case, prior to the Distribution Date.

         Preferred Shares purchasable upon exercise of the Rights will not be
redeemable.  Each Preferred Share will be entitled to a minimum preferential
quarterly dividend payment of $1 per share but will be entitled to an aggregate
dividend of 100 times the dividend declared per Common Share.  In the event of
liquidation, the holders of the Preferred Shares will be entitled to a minimum
preferential liquidation payment of $100 per share but will be entitled to an
aggregate payment of 100 times the payment made per Common Share.  Each
Preferred Share will have 100 votes, voting together with the Common Shares.
Finally, in the event of any merger, consolidation or other transaction in
which Common Shares are exchanged, each Preferred Share will be entitled to
receive 100 times the amount received per Common Share.  These rights are
protected by customary antidilution provisions.

         Because of the nature of the Preferred Shares' dividend, liquidation
and voting rights, the value of the one one-hundredth interest in a Preferred
Share purchasable upon exercise of each Right should approximate the value of
one Common Share.

         In the event that the Company is acquired in a merger or other
business combination transaction or 50% or more of its consolidated assets or
earning power are sold after a person or group has become an Acquiring Person,
proper provision will be made so that each holder of a Right will thereafter
have the right to receive, upon the exercise thereof at the then current
exercise price of the Right, that number of shares of common stock of the
acquiring company which at the time of such transaction will have a market
value of two times the exercise price of the Right.  In the event that any
person or group of affiliated or associated persons becomes an Acquiring
Person, proper provision shall be made so that each holder of a Right, other
than Rights beneficially owned by the Acquiring Person (which will thereafter
be void), will thereafter have the right to receive upon exercise that number
of Common Shares having a market value of two times the exercise price of the
Right.





                                      C-2

<PAGE>   44
         At any time after any person or group becomes an Acquiring Person and
prior to the acquisition by such person or group of 50% or more of the
outstanding Common Shares, the Board of Directors of the Company may exchange
the Rights (other than Rights owned by such person or group which will have
become void), in whole or in part, at an exchange ratio of one Common Share, or
one one-hundredth of a Preferred Share (or of a share of a class or series of
the Company's preferred stock having equivalent rights, preferences and
privileges), per Right (subject to adjustment).

         With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price.  No fractional Preferred Shares will be issued (other than
fractions which are integral multiples of one one-hundredth of a Preferred
Share, which may, at the election of the Company, be evidenced by depositary
receipts) and in lieu thereof, an adjustment in cash will be made based on the
market price of the Preferred Shares on the last trading day prior to the date
of exercise.

         At any time prior to the acquisition by a person or group of
affiliated or associated persons of beneficial ownership of 20% or more of the
outstanding Common Shares, the Board of Directors of the Company may redeem the
Rights in whole, but not in part, at a price of $.001 per Right (the
"Redemption Price"); provided, however, in the event that (a) a majority of the
Board of Directors is elected by written consent then until the earlier to
occur of (i) the 180th day following the effectiveness of such election or (ii)
the next regular annual meeting of stockholders (including any postponement or
adjournment thereof) following the effectiveness of such election, the rights
are not redeemable if such redemption is reasonably likely to have the purpose
or effect of facilitating a Transaction with an Interested Person.  The
redemption of the Rights may be made effective at such time on such basis with
such conditions as the Board of Directors in its sole discretion may establish.
Immediately upon any redemption of the Rights, the right to exercise the Rights
will terminate and the only right of the holders of Rights will be to receive
the Redemption Price.  "Interested Person" with respect to a Transaction shall
mean any person who (i) is or will become an Acquiring Person if the
Transaction were to be consummated or an affiliate or associate of such a
person, and (ii) is, or directly or indirectly proposed, nominated or
financially supported a director of the Company in office at the time of
consideration of the Transaction in question who was elected by written consent
of stockholders.  "Transaction" means any merger, consolidation or sale of
assets described in Section 13(a) of the Rights Agreement on any acquisition of
Common Shares which would result in a person becoming an Acquiring Person.

         The terms of the Rights may be amended by the Board of Directors of
the Company without the consent of the holders of the Rights, including an
amendment to lower certain thresholds described above to not less than the
greater of (i) the sum of .001% and the largest percentage of the outstanding
Common Shares then known to the Company to be beneficially owned by any person
or group of affiliated or associated persons and (ii) 10%, except that from and
after such time as any person or group of affiliated or associated persons
becomes an Acquiring Person no such amendment may adversely affect the
interests of the holders of the Rights.  In addition, in the event that a
majority of the Board of Directors of the Company is elected by written
consent, then until the earlier to occur of (i) the 180th day following the
effectiveness of such election or (ii) the next regular annual meeting of
stockholders of the Company following the effectiveness of such election
(including any postponement or





                                      C-3
<PAGE>   45
adjournment thereof), the terms of the Rights may not be supplemented or
amended in any manner reasonably likely to have the purpose or effect of
facilitating a Transaction with an Interested Person.

         Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the
right to vote or to receive dividends.

         A copy of the Second Amended and Restated Rights Agreement between the
Company and the Rights Agent dated as of May 13, 1997 (the "Second Amended and
Restated Rights Agreement") has been filed with the Securities and Exchange
Commission as an Exhibit to a Registration Statement on Form 8-A dated May 13,
1997.  A copy of the Second Amended and Restated Rights Agreement is available
free of charge from the Company.  This summary description of the Rights does
not purport to be complete and is qualified in its entirety by reference to the
Second Amended and Restated Rights Agreement, which is hereby incorporated
herein by reference.





                                      C-4


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