NATURAL MICROSYSTEMS CORP
S-8, 1996-07-30
TELEPHONE & TELEGRAPH APPARATUS
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As filed with the Securities and Exchange Commission on July 30, 1996,
                                       Registration No. 333-________

                SECURITIES AND EXCHANGE COMMISSION
                       Washington, D.C.  20549

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

                 NATURAL MICROSYSTEMS CORPORATION
          (Exact name of registrant as specified in its charter)


       Delaware                                 04-2814586
    (State or other                          (I.R.S. Employer
     jurisdiction of                        Identification No.)
     incorporation or
      organization)
                          8 Erie Drive
                 Natick, Massachusetts 01760-1339
                          (508) 650-1300
  (Address, including zip code, and telephone number, including area code,
                of registrant's principal executive offices)

                      1993 Stock Option Plan
                1993 Employee Stock Purchase Plan
               1995 Non-Statutory Stock Option Plan
                        (Full title of plans)
                           ___________

                       Robert P. Schechter
              President and Chief Executive Officer
                 Natural MicroSystems Corporation
                           8 Erie Drive
                Natick, Massachusetts  01760-1339
             (Name and address of agent for service)

                 CALCULATION OF REGISTRATION FEE
                                                 
Title of                       Proposed         Proposed     
securities                     maximum          maximum      Amount of
to be         Amount to be     offering price   offering     registration
registered    registered (1)   per share(2)     price (2)    fee 

Common Stock,   790,000
$.01 par value  Shares         $27.75          $21,922,500   $7,559.49

(1) Plus such additional number  of shares as may be required  pursuant to the
Plan in the event of a stock dividend, split-up of shares, recapitalization or
other similar change in the Common Stock.

(2) Estimated solely for the  purpose of calculating the registration fee,  in
accordance with Rule 457(h)(1),  on the basis of  the average of the  high and
low prices of the  Common Stock as reported on  the Nasdaq National Market  on
July 24, 1996.

                         EXPLANATORY NOTE

     This Registration Statement has  been prepared in accordance
with the  requirements of Form S-8,  as amended.  The  purpose of
this  Registration Statement  is  to register  790,000 shares  of
Common Stock, $.01 par value, of Natural MicroSystems Corporation
(the  "Company"); 200,000 of which  shares have been reserved for
issuance  under the  Company's  1995  Non-Statutory Stock  Option
Plan,  540,000 of which  shares have  been reserved  for issuance
under  the Company's 1993 Stock  Option Plan and  50,000 of which
shares have been reserved  for issuance under the Company's  1993
Employee Stock Purchase Plan.   190,000 shares issuable under the
1993  Stock  Option Plan  and  50,000 shares  issuable  under the
Employee Stock  Purchase  Plan have  previously  been  registered
pursuant to Registration Statement No. 33-76324.













































                            PART II

        INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.   Incorporation of Documents by Reference

     The following documents are hereby incorporated by reference
in this Registration Statement:

          (a)  The  Company's  Form  10-K   for  the  year  ended
     December  31, 1995  filed with  the Securities  and Exchange
     Commission (the "Commission") under the  Securities Exchange
     Act of 1934, as amended (the "Exchange Act"); and

          (b)  The  Company's Form  10-Q  for  the quarter  ended
     March  31,  1996  filed  with the  Securities  and  Exchange
     Commission (the "Commission") under the Exchange Act; and

          (c)  The  description of  the  Company's  Common  Stock
     incorporated  by  reference  in the  Company's  registration
     statement  on Form 8-A (SEC File No. 0-23282) filed with the
     Commission  on  January  25,   1994  from  the  registration
     statement on Form S-1 (SEC File No. 33-72596) filed with the
     Commission on December 6, 1993.

In addition, all documents filed by the Company after the initial
filing date  of this registration statement  pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, and  prior to the
filing  of a  post-effective amendment  which indicates  that all
shares registered hereunder have  been sold or which de-registers
all  shares  then  remaining  unsold,  shall   be  deemed  to  be
incorporated by  reference in this registration  statement and to
be a part hereof from the date of filing of such documents.

Item 4.   Description of Securities

     Not applicable.

Item 5.   Interests of Named Experts and Counsel

     The legality  of the shares  of Common Stock  offered hereby
has been passed  upon for the Company by Choate,  Hall & Stewart,
(a  partnership  including professional  corporations),  53 State
Street, Exchange Place, Boston,  Massachusetts 02109.  Richard N.
Hoehn, a partner of the firm, is Secretary of the Company.






                               II-1








Item 6.   Indemnification of Officers and Directors 

     Section 145 of the  General Corporation Law of the  State of
Delaware provides  that a  corporation may indemnify  a director,
officer, employee or agent against expenses (including attorneys'
fees), judgments, fines  and for  amounts paid  in settlement  in
respect  of or  in  successful defense  of  any action,  suit  or
proceeding  if  he  acted  in  good  faith  and  in  a manner  he
reasonably believed to be in or not opposed to the best interests
of the corporation, and,  with respect to any criminal  action or
proceeding,  had no reasonable  cause to believe  his conduct was
unlawful.

     Article Tenth of  the Company's Fourth Restated  Certificate
of Incorporation provides that  no director of the  Company shall
be  personally liable  to  the Company  or  its stockholders  for
monetary  damages for  breach of  fiduciary  duty as  a director,
except for liability (i) for any breach of the director's duty of
loyalty, (ii) for  acts or omissions  not in good faith  or which
involve  intentional misconduct  or a  knowing violation  of law,
(iii) under  Section 174 of the Delaware  General Corporation Law
or  (iv) for any transaction  from which the  director derived an
improper personal benefit.  Article Tenth further provides that a
director's personal  liability shall be eliminated  or limited in
the future to  the fullest extent permitted from  time to time by
the Delaware General Corporation Law.

     Article   Eleventh   of   the  Company's   Fourth   Restated
Certificate of Incorporation provides  that the Company shall, to
the fullest extent permitted from time to time under the Delaware
General  Corporation Law,  indemnify  each of  its directors  and
officers  against  all  expenses  (including   attorneys'  fees),
judgments, fines and amounts paid in settlement in respect of any
action,  suit or proceeding in which such director or officer may
be  involved or with which he  may be threatened, while in office
or thereafter, by reason  of his or  her actions or omissions  in
connection with services to  the Company, such indemnification to
include  prompt  payment  of  expenses in  advance  of  the final
disposition of any such action, suit or proceeding.


Item 7.   Exemption from Registration Claimed.

     Not applicable.

Item 8.   Exhibits 

     5.1  Opinion of Choate, Hall & Stewart as to the legality of
          the shares being registered.

     10.1 The Company's 1993 Stock  Option Plan  (As  Amended and
          Restated Effective March 8, 1996).



                               II-2


     
     
     10.2 Registrant's  1993 Employee  Stock  Purchase  Plan  (As
          Amended and Restated Effective March 8, 1996). 

     10.3 Registrant's 1995 Non-Statutory Stock Option Plan.
          (As Amended and Restated Effective March 8, 1996). 

     23.1 Consent of KPMG Peat Marwick LLP.

     23.2 Consent of Choate, Hall & Stewart (included in 
          Exhibit 5.1). 

     25.1 Power of Attorney (included in page II-5).

Item 9.   Undertakings

     (a)  The Company hereby undertakes:

          (1)  To  file, during  any  period in  which offers  or
sales  are  being  made,   a  post-effective  amendment  to  this
registration statement to  include any material information  with
respect to the plan  of distribution not previously disclosed  in
the  registration  statement  or  any  material  change  to  such
information in the registration statement;

          (2)  that, for the purpose of determining any liability
under the  Securities Act  of 1933,  as amended (the  "Securities
Act"), each such post-effective amendment shall be deemed to be a
new  registration statement  relating to  the  securities offered
therein, and the offering  of such securities at that  time shall
be deemed to be the initial bona fide offering thereof; and

          (3)  to remove  from registration  by means of  a post-
effective amendment any of  the securities being registered which
remain unsold at the termination of the offering.

     (b)  The Company  hereby  undertakes that,  for purposes  of
determining any  liability under the Securities  Act, each filing
of  the  Company's annual  report  pursuant to  Section  13(a) or
Section  15(d) of  the  Exchange  Act  that  is  incorporated  by
reference in the registration  statement shall be deemed to  be a
new  registration  statement relating  to the  securities offered
therein, and the offering  of such securities at that  time shall
be deemed to be the initial bona fide offering thereof.

     (h)  Insofar  as  indemnification  for  liabilities  arising
under the Securities Act may be permitted  to directors, officers
and controlling persons of the Company pursuant to the  foregoing
provisions, or  otherwise, the Company  has been advised  that in
the  opinion of  the Commission  such indemnification  is against
public  policy  as  expressed  in  the  Securities  Act  and  is,
therefore,  unenforceable.    In  the  event  that  a  claim  for
indemnification against such liabilities (other than the  payment
by  the Company  of  expenses incurred  or  paid by  a  director,

                               II-3


              


officer or controlling  person of the  Company in the  successful
defense  of any action, suit  or proceeding) is  asserted by such
director, officer  or controlling  person in connection  with the
securities  being registered,  the  Company will,  unless in  the
opinion of  counsel the matter  has been  settled by  controlling
precedent,  submit to  a  court of  appropriate jurisdiction  the
question  whether such  indemnification by  it is  against public
policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue. 

                            SIGNATURES

     Pursuant to the requirements of the  Securities Act of 1933,
the  Company certifies that it has  reasonable grounds to believe
that it meets all of  the requirements for filing a Form  S-8 and
has duly caused this  Registration Statement to be signed  on its
behalf by the undersigned, thereunto duly authorized, in the Town
of Natick, Commonwealth of Massachusetts on  July 23, 1996.


                              Natural MicroSystems Corporation
                              (Issuer and Employer)

                              By: /s/ Robert P. Schechter
                                  Robert P. Schechter, President
                                  and Chief Executive Officer



























                               II-4





                                  
                        POWER OF ATTORNEY

     KNOW ALL MEN  BY THESE PRESENTS, that each  individual whose
signature  appears  below  constitutes  and  appoints  Robert  P.
Schechter,  John F.  Kennedy and  Richard N.  Hoehn, jointly  and
severally, his true and lawful attorneys-in-fact and agents  with
full  powers of substitution, for him  and in his name, place and
stead, in any and all capacities, to sign any and all  amendments
(including  post-effective  amendments)   to  this   registration
statement, and to file  the same, with all exhibits  thereto, and
all documents in  connection therewith, with  the Securities  and
Exchange Commission,  granting  unto said  attorneys-in-fact  and
agents,  and each  of them, full  power and  authority to  do and
perform each and every  act and thing requisite and  necessary to
be  in  and about  the  premises,  as fully  to  all intents  and
purposes as he might or could  do in person, hereby ratifying and
confirming all  that said attorneys-in-fact and agents, or any of
them,  or their or his substitute or substitutes, may lawfully do
or cause to be done by virtue thereof.

     Pursuant  to the requirements of the Securities Act of 1933,
this registration statement  has been signed  below on the  dates
indicated by the following persons in the capacities indicated.

Name                         Capacity                        Date


/s/ Robert P. Schechter      President, Chief Executive      7/23/96
Robert P. Schechter          Officer and Director
                             (Principal Executive Officer)

/s/ John F. Kennedy          Chief Financial Officer         7/23/96
John F. Kennedy              (Principal Financial Officer)
                        

/s/ David C. Flynn           Controller                      7/23/96
David C. Flynn               (Principal Accounting Officer)

/s/ Charles T. Foskett       Director                        7/23/96
Charles T. Foskett

/s/ David F. Millet          Director                        7/23/96
David F. Millet

/s/ Ronald W. White          Director                        7/23/96
Ronald W. White

/s/ Zenas W. Hutcheson, III  Director                        7/23/96
Zenas W. Hutcheson, III

/s/ C. William McDaniel      Director                        7/23/96
C. William McDaniel

                                   

                                   
                               II-5



                        INDEX TO EXHIBITS 

Exhibit Number                                         

     5.1     Opinion of Choate, Hall & Stewart as to the legality
             of the shares being registered.

     10.1    The Company's 1993 Stock Option Plan  (As Amended
             and Restated Effective March 8, 1996).

     10.2    Registrant's 1993 Employee Stock Purchase Plan (As
             Amended and Restated Effective March 8, 1996). 

     10.3    Registrant's 1995 Non-Statutory Stock Option Plan
             (As Amended and Restated Effective March 8, 1996). 

     23.1    Consent of KPMG Peat Marwick LLP.

     23.2    Consent of Choate, Hall & Stewart (included in
             Exhibit 5.1). 

     25.1    Power of Attorney (included in page II-5).




























                               II-6


                                                  Exhibit 5.1

                      CHOATE, HALL & STEWART
        A PARTNERSHIP INCLUDING PROFESSIONAL CORPORATIONS
                          EXCHANGE PLACE
                         53 STATE STREET
                 BOSTON, MASSACHUSETTS 02109-2891
                     TELEPHONE (617)248-5000
                     FACSIMILE (617) 248-4000
                          TELEX 49615860

                                                July 30, 1996

Natural MicroSystems Corporation
8 Erie Drive
Natick, Massachusetts 01760-1339

Gentlemen:

     This opinion is delivered to you in connection with the
registration statement on Form S-8 (the "Registration Statement")
to be filed on or about July 30, 1996 by Natural MicroSystems
Corporation (the "Company") under the Securities Act of 1933, as
amended, for registration under said Act of 790,000 shares of
common stock, $.01 par value (the "Common Stock"), of the
Company.

     We are familiar with the Company's Certificate of
Incorporation, as amended, its By-Laws, as amended, and the
records of its corporate proceedings.  We have also examined such
other documents, records and certificates and made such further
investigation as we have deemed necessary for the purposes of
this opinion.

     Based upon and subject to the foregoing, we are of the
opinion that the 790,000 shares of Common Stock to be sold by the
Company under its 1993 Stock Option Plan, its 1993 Employee Stock
Purchase Plan and its 1995 Non-Statutory Stock Option Plan, each
as in effect on the date hereof, when issued against receipt of
the agreed purchase price therefor, will be legally issued, fully
paid and nonassessable.

     We understand that this opinion is to be used in connection
with the Registration Statement and consent to the filing of this
opinion as an exhibit to the Registration Statement.  We further
consent to the reference to this firm in the section entitled
"Interests of Named Experts and Counsel" in the Registration
Statement.

                                   Very truly yours,

                                   CHOATE, HALL & STEWART





                                           Exhibit 10.1

                 NATURAL MICROSYSTEMS CORPORATION

                      1993 STOCK OPTION PLAN

        (As Amended and Restated Effective March 8, 1996)
                                       

1.  PURPOSE

     The purpose of this Natural MicroSystems Corporation 1993
Stock Option Plan (the "Plan") is to provide an incentive to
certain key employees of and consultants to Natural MicroSystems
Corporation (the "Company") or any of its subsidiaries by
providing them an opportunity to participate in the ownership of
the Company.

     This Plan provides for the grant of incentive stock options,
as defined in Section 422 of the Internal Revenue Code of 1986,
as amended (the "Code"), and other ("non-statutory") stock
options to key employees of and consultants to the Company or any
of its subsidiaries.  All such incentive stock options and
non-statutory options which may be granted under this Plan are
hereinafter referred to as "Options."


2.  ADMINISTRATION OF THE PLAN

     This Plan shall be administered by the Board of Directors of
the Company (the "Board").  Subject to the provisions of
Section 15, the Board is authorized to interpret the Plan, to
prescribe, amend and rescind rules and regulations relating to
it, and to make all other determinations necessary or advisable
for its administration.  The Board shall have the right, at its
discretion, to delegate any and all of its powers hereunder to
the Chief Executive Officer ("CEO") of the Company (excluding, as
to such officer, any power in respect of Options granted or to be
granted to officers of the Company) or to a Committee appointed
by the Board.  If the Board delegates its powers to the CEO or a
Committee, in whole or in part, the CEO's or Committee's
determinations with respect thereto shall not be subject to
approval by the Board, and to the extent of such delegation,
references in this Plan to the Board shall be deemed to refer to
the CEO or the Committee.


3.  SHARES COVERED BY THE PLAN

     Options may be granted under the Plan while the Plan is in
effect for the purchase of not in excess of 730,000 shares of the
Common Stock, $.01 par value ("Common Stock"), of the Company



(subject to adjustment as provided in Section 12 hereof).  Shares
covered by unexercised Options which are no longer exercisable
for any reason shall be available for issuance under Options
granted hereunder for purposes of computing the foregoing
limitation unless the Plan has been terminated.  Shares delivered
on exercise of Options may be made available from authorized and
unissued Common Stock or from Common Stock held in the Treasury
of the Company.  In connection with the grant of any
non-statutory stock option under the Plan, the Board may in its
discretion provide for a cash payment to be made to the person
exercising the Option, at the time of exercise, in such amount as
the Board determines to be appropriate to reimburse such person,
in whole or in part, for any federal or state income taxes
incurred in connection with such exercise.  Such payment may be
applied to the satisfaction of any applicable withholding tax
which is incurred in connection with such exercise or with such
payment.


4.  ELIGIBILITY

     The persons who shall be eligible to receive Options under
the Plan shall be key employees of and consultants to the Company
or any of its subsidiaries.  Such persons are hereinafter
referred to as "Eligible Individuals."


5.  ALLOTMENT OF OPTIONS AND NUMBER OF SHARES

     The allotment of Options among the Eligible Individuals, the
number of shares to be covered by each Option to be granted, and
the designation of Options as either incentive stock options or
non-statutory stock options shall be determined by the Board;
provided, however, that an incentive stock option may be granted
only to an Eligible Individual who is an employee of or
consultant to the Company or a subsidiary. 


6.  INDIVIDUAL PARTICIPANT LIMITATION 

     Any other provision of the Plan notwithstanding, the number
of shares of Common Stock for which Options may be granted in any
single fiscal year of the Company to any Eligible Individual
shall not exceed 200,000 shares (the "Individual Limit").  For
purposes of the foregoing limitation, if any Option is cancelled,
the cancelled Option shall continue to be counted against the
Individual Limit; and if after grant the exercise price of an
Option is modified, the transaction shall be treated as the
cancellation of the Option and the grant of a new Option.  In any
such case, both the Option that is cancelled and the Option
deemed to be granted shall be counted against the Individual
Limit.

                          -2-






7.  OPTION AGREEMENTS

     Each Eligible Individual to whom an Option is granted (an
"Optionee") shall enter into a written agreement with the Company
setting forth the terms and conditions of the Option granted to
him, which agreement may contain such terms, conditions and
restrictions not inconsistent with the terms of the Plan as the
Board shall approve.


8.  OPTION PRICE

     The price to be paid by an Optionee who exercises an Option
shall be determined by the Board; provided that in no event shall
the price be less than the fair market value of the Common Stock
on the date the Option is granted; and provided that in the case
of an incentive stock option granted to an Eligible Individual
who owns stock representing more than 10% of the voting power of
all classes of stock of the Company or any of its subsidiaries,
the option price shall not be less than 110% of such fair market
value.


9.  DURATION AND RATE OF EXERCISE OF OPTIONS

     The option period shall be fixed by the Board but in any
event each Option shall by its terms be exercisable no later than
the expiration of ten years from the date the Option is granted;
provided that in the case of an incentive stock option granted to
an Eligible Individual who owns stock representing more than 10%
of the voting power of all classes of stock of the Company or any
of its subsidiaries, the option shall not be exercisable after
the expiration of five years from the date the Option is granted.

     The Board shall determine the rate at which each Option
shall be exercisable, provided that in no event shall an Option
be exercisable at a rate greater than 12.50% of the shares under
the Option per quarter.

     The Board shall determine the manner in which each Option
shall be exercisable, the timing and form of the purchase price
to be paid by an Optionee upon the exercise of an Option, and any
restrictions to be imposed upon the Common Stock received on
exercise of an Option.  To the extent provided in the option
agreement, payment of the purchase price may be entirely in cash,
part in cash and part by personal promissory note or in whole or
in part by the surrender of a whole number of shares of
previously issued Common Stock of the Company.  Previously issued
shares of Common Stock shall be accepted as payment in an amount
equal to the then fair market value of the surrendered shares.


                          -3-







10.  NONTRANSFERABILITY OF OPTIONS

     Each Option granted under the Plan to any Eligible
Individual shall by its terms not be transferable by him
otherwise than by will or the laws of descent and distribution,
and shall be exercisable during his lifetime only by him.


11.  RIGHTS AS A STOCKHOLDER

     An Optionee shall have no rights as a stockholder with
respect to any shares covered by his Options until he shall have
become the holder of record of such shares, and no adjustment
shall be made, except adjustments pursuant to Section 12 hereof,
for dividends (ordinary or extraordinary, whether in cash,
securities or other property) or distributions or other rights in
respect of such shares for which the record date is prior to the
date on which he shall have become the holder of record thereof.


12.  EFFECT OF CHANGE IN STOCK SUBJECT TO THE PLAN

     In the event there is any change in the shares of Common
Stock of the Company through the declaration of stock dividends
or through recapitalizations resulting in stock subdivisions or
combinations or exchanges of shares or otherwise, the number of
shares available for Option, the exercise price of outstanding
Options, and the number of shares subject to any Option shall be
appropriately adjusted by the Board.

     If the Company is merged into or consolidated with another
corporation under circumstances where the Company is not the
surviving corporation, or if the Company is liquidated or sells
or otherwise disposes of substantially all of its assets to
another corporation while unexercised Options remain outstanding,
(i) subject to the provisions of clauses (iii) and (iv) below,
after the effective date of such merger, consolidation or sale,
as the case may be, each holder of an outstanding Option shall be
entitled, upon exercise of such Option, to receive in lieu of
shares of Common Stock, shares of such stock or other securities
as the holders of shares of Common Stock received pursuant to the
terms of the merger, consolidation or sale; or (ii) the Board may
waive any discretionary limitations imposed pursuant to Section 9
hereof so that all Options from and after a date prior to the
effective date of such merger, consolidation, liquidation or
sale, as the case may be, specified by the Board, shall be
exercisable in full; or (iii) all outstanding Options may be
cancelled by the Board as of the effective date of any such
merger, consolidation, liquidation or sale provided that notice
of such cancellation shall be given to each holder of an Option,
and each holder of an Option shall have the right to exercise
such Option in full (without regard to any discretionary

                          -4-






limitations imposed pursuant to Section 9 hereof) during a 30-day
period preceding the effective date of such merger,
consolidation, liquidation or sale; or (iv) all outstanding
Options may be cancelled by the Board as of the date of any such
merger, consolidation, liquidation or sale provided that notice
of such cancellation shall be given to each holder of an Option,
and each holder of an Option shall have the right to exercise
such Option but only to the extent exercisable in accordance with
any discretionary limitations imposed pursuant to Section 9 prior
to the effective date of such merger, consolidation, liquidation
or sale.


13.  GRANT OF OPTIONS IN CONNECTION WITH CERTAIN ACQUISITIONS

     The Board may grant Options under the Plan in substitution
for incentive stock options or non-statutory stock options
granted under plans of other employers, if such grant occurs by
reason of a corporate merger, consolidation, separation,
reorganization, or liquidation to which the Company is a party,
or by reason of the acquisition of property or stock of another
corporation by the Company; provided that, with respect to any
incentive stock option, such transaction is a transaction to
which Section 424(a) of the Code applies.  The Board may impose
such terms and conditions upon the grant of any incentive stock
option under this Section 13 as are necessary to ensure that the
substitution will not constitute a modification of the Option
under Section 424(h) of the Code, even though any such term or
condition would otherwise be inconsistent with the provisions of
this Plan.  Options granted under the provisions of this
Section 13 may be granted at a price less than the fair market
value of the Common Stock on the date such Option is granted, so
long as the ratio of the option price to the fair market value of
the Common Stock is no more favorable to the Optionee than the
ratio of the option price to the fair market value of the stock
subject to the old option immediately before such substitution. 
Except as otherwise specifically provided in the agreement
setting forth the terms and conditions of such an Option, the
provisions of this Plan shall govern any options granted under
this Section 13.  Nothing in this Section 13 shall be deemed to
authorize the grant of Options under the Plan for a number of
shares in excess of the number set forth in Section 3, nor to
limit in any way the authority of the Board to grant substituted
options in connection with such transactions other than under the
Plan.


14.  USE OF PROCEEDS

     The proceeds received by the Company from the sale of Common
Stock pursuant to the Plan may be used for general corporate
purposes.

                          -5-






15.  AMENDMENT AND DISCONTINUANCE

     The Board may from time to time alter or suspend and at any
time discontinue the Plan.  However, no action of the Board may
alter or impair an Optionee's rights under any outstanding Option
previously granted under the Plan, without the consent of the
holder of the Option.


16.  EFFECTIVE DATE AND TERMINATION DATE

     The Plan shall become effective and shall be deemed to have
been adopted on October 22, 1993, the date of its adoption by the
Board.  The stockholders of the Company approved the Plan on
January 13, 1994.  Any amendment to the Plan for which
stockholder approval is sought shall become effective as of the
date of the adoption of such amendment by the Board, subject to
such stockholder approval within 12 months of such date.  The
Plan shall remain in effect until terminated by the Board, but
not later than ten years after the date the Plan is initially
adopted by the Board, or is approved by the stockholders,
whichever first occurs.

                           ____________


     Adopted by the Board of Directors on October 22, 1993, with
the approval of the stockholders on January 13, 1994.  Amended by
the Board of Directors on March 17, 1995, with the approval of
the stockholders on April 21, 1995.  Amended by the Board of
Directors on March 8, 1996, with the approval of the stockholders
on May 3, 1996.




















                          -6-




                                                  Exhibit 10.2 

                 NATURAL MICROSYSTEMS CORPORATION

                1993 EMPLOYEE STOCK PURCHASE PLAN

        (As Amended and Restated Effective March 8, 1996)
                      ______________________

l.   PURPOSE  

     The purpose of this Employee Stock Purchase Plan (the
"Plan") is to provide employees of Natural MicroSystems
Corporation, a Delaware corporation (the "Company"), and its
subsidiaries, an opportunity to purchase Common Stock, $.01 par
value, of the Company (the "Shares").  The Plan is intended to
qualify as an "employee stock purchase plan" within the meaning
of Section 423 of the Internal Revenue Code of 1986, as amended
(the "Code").

2.   ADMINISTRATION OF THE PLAN

     The Board of Directors or any committee or persons to whom
it delegates its authority (the "Administrator") shall
administer, interpret and apply all provisions of the Plan.  The
Administrator may waive such provisions of the Plan as it deems
necessary to meet special circumstances not anticipated or
covered expressly by the Plan.  Nothing contained in this Section
shall be deemed to authorize the Administrator to alter or
administer the provisions of the Plan in a manner inconsistent
with the provisions of Section 423 of the Code.  No member of the
Administrator shall be liable for any action or determination
made in good faith with respect to the Plan or any right granted
under it.

3.   ELIGIBLE EMPLOYEES

     Subject to the provisions of Sections 8, 9 and 10 below, any
individual who is in the full-time employment (as defined below)
of the Company, or any of its subsidiaries (as defined in Section
424(f) of the Code) the employees of which are designated by the
Board of Directors as eligible to participate in the Plan, is
eligible to participate in any Offering of Shares (as defined in
Section 4 below) made by the Company hereunder.  Full-time
employment shall include all employees whose customary employment
is:

     (a)  in excess of 20 hours per week; and

     (b)  more than five months in the relevant calendar year.


 



4.   OFFERING DATES

     From time to time the Company, by action of the Board of
Directors, will grant rights to purchase Shares to employees
eligible to participate in the Plan pursuant to one or more
offerings (each of which is an "Offering") on a date or series of
dates (each of which is an "Offering Date") designated for this
purpose by the Board of Directors.

5.   PRICES

     The price per share for each grant of rights hereunder shall
be the lesser of:

     (a)  eighty-five percent (85%) of the fair market value of a
          Share on the Offering Date on which such right was
          granted; or

     (b)  eighty-five percent (85%) of the fair market value of a
          Share on the date such right is exercised.  At its
          discretion, the Board of Directors may determine a
          higher price for a grant of rights.

     For purposes of this Plan, the term "fair market value" on
     any date means shall mean (i) the average (on that date) of
     the high and low prices for shares of the Common Stock on
     the principal national securities exchange on which the
     Common Stock are traded, if the Common Stock is then listed
     on a national securities exchange; or (ii) the last reported
     sale price (on that date) of shares of the Common Stock on
     NASDAQ if the Common Stock is not then listed on a national
     securities exchange; or, if not so reported or listed, (iii)
     the closing bid price (or average of bid prices) last quoted
     (on that date) of shares of the Common Stock on the
     over-the-counter market.  If the Company's Common Stock is
     not publicly traded at the time a right is granted under
     this Plan, "fair market value" shall mean the fair market
     value of shares of the Common Stock as determined by the
     Administrator after taking into consideration all factors
     which it deems appropriate, including, without limitation,
     recent sale and offer prices of shares of the Common Stock
     in private transactions negotiated at arm's length.

 6.  EXERCISE OF RIGHTS AND METHOD OF PAYMENT

     (a)  Rights granted under the Plan will be exercisable
          periodically on specified dates as determined by the
          Board of Directors.

     (b)  The method of payment for Shares purchased upon
          exercise of rights granted hereunder shall be through
          regular payroll deductions or by lump sum cash payment,

                                2






          or both, as determined by the Board of Directors.  No
          interest shall be paid upon payroll deductions unless
          specifically provided for by the Board of Directors.

     (c)  Any payments received by the Company from a
          participating employee and not utilized for the
          purchase of Shares upon exercise of a right granted
          hereunder shall be promptly returned to such employee
          by the Company after termination of the right to which
          the payment relates.

7.   TERM OF RIGHTS

     Rights granted on any Offering Date shall be exercisable
upon the expiration of such period ("Offering Period") as shall
be determined by the Board of Directors when it authorizes the
Offering, provided that such Offering Period shall in no event be
longer than twenty-seven (27) months.

8.   SHARES COVERED BY THE PLAN

     No more than 100,000 Shares may be sold pursuant to rights
granted under the Plan; provided, however, that appropriate
adjustment shall be made in such number, in the number of Shares
covered by outstanding rights granted hereunder, in the exercise
price of the rights and in the maximum number of Shares which an
employee may purchase (pursuant to Section 9 below) to give
effect to any mergers, consolidations, reorganizations,
recapitalizations, stock splits, stock dividends or other
relevant changes in the capitalization of the Company occurring
after the effective date of the Plan, provided that no fractional
Shares shall be subject to a right and each right shall be
adjusted downward to the nearest full Share.  Any agreement of
merger or consolidation will include provisions for protection of
the then existing rights of participating employees under the
Plan.  Either authorized and unissued Shares or issued Shares
heretofore or hereafter reacquired by the Company may be made
subject to rights under the Plan.  If for any reason any right
under the Plan terminates in whole or in part, Shares subject to
such terminated right may again be subjected to a right under the
Plan.

9.   LIMITATIONS ON GRANTS

     (a)  No employee shall be granted a right hereunder if such
          employee, immediately after the right is granted, would
          own stock or rights to purchase stock possessing five
          percent (5%) or more of the total combined voting power
          or value of all classes of stock of the Company, or of
          any subsidiary, computed in accordance with Sections
          423(b)(3) and 424(d) of the Code.


                                3






     (b)  No employee shall be granted a right which permits his
          right to purchase shares under all employee stock
          purchase plans of the Company and its subsidiaries to
          accrue at a rate which exceeds twenty-five thousand
          dollars ($25,000) (or such other maximum as may be
          prescribed from time to time by the Code) of the fair
          market value of such Shares (determined at the time
          such right is granted) for each calendar year in which
          such right is outstanding at any time in accordance
          with the provisions of Section 423(b)(8) of the Code.

     (c)  No right granted to any participating employee under a
          single Offering shall cover more shares than may be
          purchased at an exercise price equal to 10% of the
          compensation payable to the employee during the
          Offering not taking into consideration any changes in
          the employee's rate of compensation after the date the
          employee elects to participate in the Offering, or such
          other percentage as determined by the Board of
          Directors from time to time.

10.  LIMIT ON PARTICIPATION

     Participation in an Offering shall be limited to eligible
employees who elect to participate in such Offering in the
manner, and within the time limitation, established by the Board
of Directors when it authorizes the offering.

11.  CANCELLATION OF ELECTION TO PARTICIPATE

     An employee who has elected to participate in an Offering
may, unless the employee has waived this cancellation right at
the time of such election in a manner established by the Board of
Directors, cancel such election as to all (but not part) of the
rights granted under such Offering by giving written notice of
such cancellation to the Company before the expiration of the
Offering Period.  Any amounts paid by the employee for the Shares
or withheld for the purchase of Shares from the employee's
compensation through payroll deductions shall be paid to the
employee, without interest, upon such cancellation.

12.  TERMINATION OF EMPLOYMENT

     Upon termination of employment for any reason, including the
death of the employee, before the date on which any rights
granted under the Plan are exercisable, all such rights shall
immediately terminate and amounts paid by the employee for the
Shares or withheld for the purchase of Shares from the employee's
compensation through payroll deductions shall be paid to the
employee or to the employee's estate, without interest.


                                4







13.  EMPLOYEE'S RIGHTS AS STOCKHOLDER

     No participating employee shall have any rights as a
stockholder in the Shares covered by a right granted hereunder
until such right has been exercised, full payment has been made
for the corresponding Shares and the Share certificate is
actually issued.

14.  RIGHTS NOT TRANSFERABLE

     Rights under the Plan are not assignable or transferable by
a participating employee and are exercisable only by the
employee.

15.  LIMITS ON SALE OF STOCK PURCHASED UNDER THE PLAN

     The Plan is intended to provide shares of Common Stock for
investment and not for resale.  The Company does not, however,
intend to restrict or influence any employee in the conduct of
his/her own affairs.  An employee may, therefore, sell stock
purchased under the Plan at any time the employee chooses,
subject to compliance with any applicable Federal or state
securities laws; provided, however, that because of certain
Federal tax requirements, each employee agrees by entering the
Plan, promptly to give the Company notice of any such stock
disposed of within two years after the date of grant of the
applicable right showing the number of such shares disposed of. 
THE EMPLOYEE ASSUMES THE RISK OF ANY MARKET FLUCTUATIONS IN THE
PRICE OF THE STOCK.

16.  AMENDMENTS TO OR DISCONTINUANCE OF THE PLAN

     The Board of Directors may at any time terminate or amend
this Plan without notice and without further action on the part
of stockholders of the Company, provided that no such termination
or amendment shall adversely affect the then existing rights of
any participating employee.

17.  EFFECTIVE DATE AND APPROVALS

     The Plan is being adopted by the Board of Directors on
October 22, 1993 to become effective as of said date. The Plan
was  approved by the stockholders on January 13, 1994.  The
Company's obligation to offer, sell and deliver its Shares under
the Plan is subject to the approval of any governmental authority
required in connection with the authorized issuance or sale of
such Shares and is further subject to the Company receiving the
opinion of its counsel that all applicable securities laws have
been complied with.

18.  TERM OF PLAN.  No rights shall be granted under the Plan
after October 22, 2003.

     Amended by the Board of Directors on March 8, 1996, with the
approval of the stockholders on May 3, 1996.

                                      5

                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                                           Exhibit 10.3

                 NATURAL MICROSYSTEMS CORPORATION

               1995 NON-STATUTORY STOCK OPTION PLAN

        (As Amended and Restated Effective March 8, 1996)

                                       

1.  PURPOSE

     The purpose of this Natural MicroSystems Corporation 1995
Non-Statutory Stock Option Plan (the "Plan") is to provide an
incentive to certain employees (other than executive officers,
who are not eligible to participate in the Plan) of and
consultants to Natural MicroSystems Corporation (the "Company")
or any of its subsidiaries by providing them an opportunity to
participate in the ownership of the Company.

     This Plan provides for the grant of non-statutory stock
options (i.e., stock options which are not intended to qualify as
incentive stock options as defined in Section 422 of the Internal
Revenue Code of 1986, as amended (the "Code")) to non-executive
officer employees of and consultants to the Company or any of its
subsidiaries.  All such stock options which may be granted under
this Plan are hereinafter referred to as "Options."


2.  ADMINISTRATION OF THE PLAN

     This Plan shall be administered by the Board of Directors of
the Company (the "Board").  Subject to the provisions of
Section 14, the Board is authorized to interpret the Plan, to
prescribe, amend and rescind rules and regulations relating to
it, and to make all other determinations necessary or advisable
for its administration.  The Board shall have the right, at its
discretion, to delegate any and all of its powers hereunder to
the Chief Executive Officer ("CEO") of the Company (excluding, as
to such officer, any power in respect of Options granted or to be
granted to officers of the Company) or to a Committee appointed
by the Board.  If the Board delegates its powers to the CEO or a
Committee, in whole or in part, the CEO's or Committee's
determinations with respect thereto shall not be subject to
approval by the Board, and to the extent of such delegation,
references in this Plan to the Board shall be deemed to refer to
the CEO or the Committee.


3.  SHARES COVERED BY THE PLAN
     
     Options may be granted under the Plan while the Plan is in
effect for the purchase of not in excess of 200,000 shares of the
Common Stock, $.01 par value ("Common Stock"), of the Company
(subject to adjustment as provided in Section 11 hereof).  Shares
covered by unexercised Options which are no longer exercisable
for any reason shall be available for issuance under Options
granted hereunder for purposes of computing the foregoing
limitation unless the Plan has been terminated.  Shares delivered
on exercise of Options may be made available from authorized and
unissued Common Stock or from Common Stock held in the Treasury
of the Company.  In connection with the grant of any Option under
the Plan, the Board may in its discretion provide for a cash
payment to be made to the person exercising the Option, at the
time of exercise, in such amount as the Board determines to be
appropriate to reimburse such person, in whole or in part, for
any federal or state income taxes incurred in connection with
such exercise.  Such payment may be applied to the satisfaction
of any applicable withholding tax which is incurred in connection
with such exercise or with such payment.


4.  ELIGIBILITY

     The persons who shall be eligible to receive Options under
the Plan shall be non-executive officer employees of and
consultants to the Company or any of its subsidiaries.  Such
persons are hereinafter referred to as "Eligible Individuals."


5.  ALLOTMENT OF OPTIONS AND NUMBER OF SHARES

     The allotment of Options among the Eligible Individuals, the
number of shares to be covered by each Option to be granted shall
be determined by the Board. 


6.  OPTION AGREEMENTS

     Each Eligible Individual to whom an Option is granted (an
"Optionee") shall enter into a written agreement with the Company
setting forth the terms and conditions of the Option granted to
him, which agreement may contain such terms, conditions and
restrictions not inconsistent with the terms of the Plan as the
Board shall approve.


7.  OPTION PRICE

     The price to be paid by an Optionee who exercises an Option
shall be determined by the Board; provided that in no event shall
the price be less than the fair market value of the Common Stock
on the date the Option is granted.


                          -2-



8.  DURATION AND RATE OF EXERCISE OF OPTIONS

     The option period shall be fixed by the Board but in any
event each Option shall by its terms be exercisable no later than
the expiration of ten years from the date the Option is granted.
The Board shall determine the rate at which each Option shall be
exercisable, provided that in no event shall an Option be
exercisable at a rate greater than 12.50% of the shares under the
Option per quarter.

     The Board shall determine the manner in which each Option
shall be exercisable, the timing and form of the purchase price
to be paid by an Optionee upon the exercise of an Option, and any
restrictions to be imposed upon the Common Stock received on
exercise of an Option.  To the extent provided in the option
agreement, payment of the purchase price may be entirely in cash,
part in cash and part by personal promissory note or in whole or
in part by the surrender of a whole number of shares of
previously issued Common Stock of the Company.  Previously issued
shares of Common Stock shall be accepted as payment in an amount
equal to the then fair market value of the surrendered shares.


9.  NONTRANSFERABILITY OF OPTIONS

     Each Option granted under the Plan to any Eligible
Individual shall by its terms not be transferable by him
otherwise than by will or the laws of descent and distribution,
and shall be exercisable during his lifetime only by him.


10.  RIGHTS AS A STOCKHOLDER

     An Optionee shall have no rights as a stockholder with
respect to any shares covered by his Options until he shall have
become the holder of record of such shares, and no adjustment
shall be made, except adjustments pursuant to Section 11 hereof,
for dividends (ordinary or extraordinary, whether in cash,
securities or other property) or distributions or other rights in
respect of such shares for which the record date is prior to the
date on which he shall have become the holder of record thereof.


11.  EFFECT OF CHANGE IN STOCK SUBJECT TO THE PLAN

     In the event there is any change in the shares of Common
Stock of the Company through the declaration of stock dividends
or through recapitalizations resulting in stock subdivisions or
combinations or exchanges of shares or otherwise, the number of
shares available for Option, the exercise price of outstanding
Options, and the number of shares subject to any Option shall be
appropriately adjusted by the Board.

                          -3-





     
     If the Company is merged into or consolidated with another
corporation under circumstances where the Company is not the
surviving corporation, or if the Company is liquidated or sells
or otherwise disposes of substantially all of its assets to
another corporation while unexercised Options remain outstanding,
(i) subject to the provisions of clauses (iii) and (iv) below,
after the effective date of such merger, consolidation or sale,
as the case may be, each holder of an outstanding Option shall be
entitled, upon exercise of such Option, to receive in lieu of
shares of Common Stock, shares of such stock or other securities
as the holders of shares of Common Stock received pursuant to the
terms of the merger, consolidation or sale; or (ii) the Board may
waive any discretionary limitations imposed pursuant to Section 8
hereof so that all Options from and after a date prior to the
effective date of such merger, consolidation, liquidation or
sale, as the case may be, specified by the Board, shall be
exercisable in full; or (iii) all outstanding Options may be
cancelled by the Board as of the effective date of any such
merger, consolidation, liquidation or sale provided that notice
of such cancellation shall be given to each holder of an Option,
and each holder of an Option shall have the right to exercise
such Option in full (without regard to any discretionary
limitations imposed pursuant to Section 8 hereof) during a 30-day
period preceding the effective date of such merger,
consolidation, liquidation or sale; or (iv) all outstanding
Options may be cancelled by the Board as of the date of any such
merger, consolidation, liquidation or sale provided that notice
of such cancellation shall be given to each holder of an Option,
and each holder of an Option shall have the right to exercise
such Option but only to the extent exercisable in accordance with
any discretionary limitations imposed pursuant to Section 8 prior
to the effective date of such merger, consolidation, liquidation
or sale.


12.  GRANT OF OPTIONS IN CONNECTION WITH CERTAIN ACQUISITIONS

     The Board may grant Options under the Plan in substitution
of stock options granted under plans of other employers, if such
grant occurs by reason of a corporate merger, consolidation,
separation, reorganization, or liquidation to which the Company
is a party, or by reason of the acquisition of property or stock
of another corporation by the Company.

13.  USE OF PROCEEDS

     The proceeds received by the Company from the sale of Common
Stock pursuant to the Plan may be used for general corporate
purposes.



                          -4-







14.  AMENDMENT AND DISCONTINUANCE

     The Board may from time to time alter or suspend and at any
time discontinue the Plan.  However, no action of the Board may
alter or impair an Optionee's rights under any outstanding Option
previously granted under the Plan, without the consent of the
holder of the Option.

15.  EFFECTIVE DATE AND TERMINATION DATE

     The Plan shall become effective and shall be deemed to have
been adopted on October 27, 1995, the date of its adoption by the
Board.  The Plan shall remain in effect until terminated by the
Board, but not later than October 26, 2005.


     Amended by the Board of Directors on March 8, 1996.





































                                           -5-

                                                Exhibit 23.1


                        AUDITOR'S CONSENT

The Board of Directors
Natural MicroSystems Corporation

We consent to incorporation by reference in this registration
statement on Form S-8 of Natural MicroSystems Corporation of our
report dated January 22, 1996, relating to the consolidated
balance sheets of the Natural MicroSystems Corporation as of
December 31, 1995 and 1994 and the related consolidated
statements of operations, stockholders' equity, and cash flow for
each of the years in the three-year period ended December 31,
1995, and all related schedules, which report appears in the
December 31, 1995 annual report on Form 10-K of Natural
MicroSystems Corporation.



                                   KPMG PEAT MARWICK LLP


Boston, MA
July 24, 1996








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