COMMUNICATION TELESYSTEMS INTERNATIONAL

                     1996 STOCK OPTION/STOCK ISSUANCE PLAN


                                  ARTICLE ONE

                              GENERAL PROVISIONS

     I.  PURPOSE OF THE PLAN

         This 1996 Stock Option/Stock Issuance Plan is intended to promote
the interests of Communication TeleSystems International, a California
corporation, by providing eligible persons with the opportunity to acquire a
proprietary interest, or otherwise increase their proprietary interest, in
the Corporation as an incentive for them to remain in the service of the
Corporation.

         Capitalized terms shall have the meanings assigned to such terms in
the attached Appendix.

    II.  STRUCTURE OF THE PLAN

         A.  The Plan shall be divided into two separate equity programs:

             -  the Discretionary Option Grant Program under which eligible
persons may, at the discretion of the Plan Administrator, be granted options
to purchase shares of Common Stock, and

             -  the Stock Issuance Program under which eligible persons may,
at the discretion of the Plan Administrator, be issued shares of Common Stock
directly, either through the immediate purchase of such shares or as a bonus
for services rendered the Corporation (or any Parent or Subsidiary).

         B.  The provisions of Articles One and Four shall apply to all
equity programs under the Plan and shall govern the interests of all persons
under the Plan.

   III.  ADMINISTRATION OF THE PLAN

         A.  Prior to the Section 12 Registration Date, the Discretionary
Option Grant and Stock Issuance Programs shall be administered by the Board.
Beginning with the Section 12 Registration Date, the Primary Committee shall
have sole and exclusive authority to administer the Discretionary Option
Grant and Stock Issuance Programs with respect to Section 16 Insiders.



         B.  Administration of the Discretionary Option Grant and Stock
Issuance Programs with respect to all other persons eligible to participate
in those programs may, at the Board's discretion, be vested in the Primary
Committee or a Secondary Committee, or the Board may retain the power to
administer those programs with respect to all such persons. The members of
the Secondary Committee may be Board members who are Employees eligible to
receive discretionary option grants or direct stock issuances under the Plan
or any other stock option, stock appreciation, stock bonus or other stock
plan of the Corporation (or any Parent or Subsidiary).

         C.  Members of the Primary Committee or any Secondary Committee
shall serve for such period of time as the Board may determine and may be
removed by the Board at any time. The Board may also at any time terminate
the functions of any Secondary Committee and reassume all powers and
authority previously delegated to such committee.

         D.  Each Plan Administrator shall, within the scope of its
administrative functions under the Plan, have full power and authority
(subject to the provisions of the Plan) to establish such rules and
regulations as it may deem appropriate for proper administration of the
Discretionary Option Grant and Stock Issuance Programs and to make such
determinations under, and issue such interpretations of, the provisions of
such programs and any outstanding options or stock issuances thereunder as it
may deem necessary or advisable. Decisions of the Plan Administrator within
the scope of its administrative functions under the Plan shall be final and
binding on all parties who have an interest in the Discretionary Option Grant
and Stock Issuance Programs under its jurisdiction or any option or stock
issuance thereunder.

         E.  Service on the Primary Committee or the Secondary Committee
shall constitute service as a Board member, and members of each such
committee shall accordingly be entitled to full indemnification and
reimbursement as Board members for their service on such committee. No member
of the Primary Committee or the Secondary Committee shall be liable for any
act or omission made in good faith with respect to the Plan or any option
grants or stock issuances under the Plan.

     IV. ELIGIBILITY

         A.  The persons eligible to participate in the Discretionary Option
Grant and Stock Issuance Programs are as follows:

                   (i)  Employees,

                  (ii)  non-employee members of the Board or the board of
     directors of any Parent or Subsidiary, and

                 (iii)  consultants and other independent advisors who
     provide services to the Corporation (or any Parent or Subsidiary).

                                       2.



         B.  Each Plan Administrator shall, within the scope of its
administrative jurisdiction under the Plan, have full authority to determine,
(i) with respect to the option grants under the Discretionary Option Grant
Program, which eligible persons are to receive option grants, the time or
times when such option grants are to be made, the number of shares to be
covered by each such grant, the status of the granted option as either an
Incentive Option or a Non-Statutory Option, the time or times when each
option is to become exercisable, the vesting schedule (if any) applicable to
the option shares and the maximum term for which the option is to remain
outstanding and (ii) with respect to stock issuances under the Stock Issuance
Program, which eligible persons are to receive stock issuances, the time or
times when such issuances are to be made, the number of shares to be issued
to each Participant, the vesting schedule (if any) applicable to the issued
shares and the consideration for such shares.

         C.  The Plan Administrator shall have the absolute discretion either
to grant options in accordance with the Discretionary Option Grant Program or
to effect stock issuances in accordance with the Stock Issuance Program.

     V.  STOCK SUBJECT TO THE PLAN

         A.  The stock issuable under the Plan shall be shares of authorized
but unissued or reacquired Common Stock, including shares repurchased by the
Corporation on the open market. The maximum number of shares of Common Stock
initially reserved for issuance over the term of the Plan shall not exceed
1,000,000 shares. In addition, on the first business day each calendar year,
commencing the first such date in 1998, there shall be added to the maximum
number of shares available for issuance under the Plan that number of shares
necessary to cause such maximum number, including shares previously issued
pursuant to the Plan and any options then outstanding, to equal 5% of the
total number of shares of Common Stock of the Company issued and outstanding
as of said meeting.

         B.  No one person participating in the Plan may receive options,
separately exercisable stock appreciation rights and direct stock issuances
for more than 50,000 shares of Common Stock in the aggregate per calendar
year, beginning with the 1996 calendar year.

         C.  Shares of Common Stock subject to outstanding options shall be
available for subsequent issuance under the Plan to the extent those options
expire or terminate for any reason prior to exercise in full. Unvested shares
issued under the Plan and subsequently cancelled or repurchased by the
Corporation, at the original issue price paid per share, pursuant to the
Corporation's repurchase rights under the Plan shall be added back to the
number of shares of Common Stock reserved for issuance under the Plan and
shall accordingly be available for reissuance through one or more subsequent
option grants or direct stock issuances under the Plan. However, should the
exercise price of an option under the Plan be paid with shares of Common
Stock or should shares of Common Stock otherwise issuable under the Plan be
withheld by the Corporation in satisfaction of the withholding taxes incurred
in connection with the exercise of an option or the vesting

                                       3.



of a stock issuance under the Plan, then the number of shares of Common Stock
available for issuance under the Plan shall be reduced by the gross number of
shares for which the option is exercised or which vest under the stock
issuance, and not by the net number of shares of Common Stock issued to the
holder of such option or stock issuance. Notwithstanding the above, no
additional adjustment shall be made to any shares or class of shares with
respect to any transaction occurring prior to the completion of an offering
of shares of the Common Stock of the Company to the public pursuant to an
effective registration statement.

         D.  If any change is made to the Common Stock by reason of any
stock split, stock dividend, recapitalization, combination of shares,
exchange of shares or other change affecting the outstanding Common Stock as
a class without the Corporation's receipt of consideration, appropriate
adjustments shall be made to (i) the maximum number and/or class of
securities issuable under the Plan, (ii) the number and/or class of
securities for which any one person may be granted stock options, separately
exercisable stock appreciation rights and direct stock issuances under this
Plan per calendar year, and (iii) the number and/or class of securities and
the exercise price per share in effect under each outstanding option under
the Plan. Such adjustments to the outstanding options are to be effected in
a manner which shall preclude the enlargement or dilution of rights and
benefits under such options. The adjustments determined by the Plan
Administrator shall be final, binding and conclusive.

                                 ARTICLE TWO

                      DISCRETIONARY OPTION GRANT PROGRAM

     I.  OPTION TERMS

         Each option shall be evidenced by one or more documents in the form
approved by the Plan Administrator; PROVIDED, however, that each such
document shall comply with the terms specified below. Each document
evidencing an Incentive Option shall, in addition, be subject to the
provisions of the Plan applicable to such options.

         A.  EXERCISE PRICE

             1.  The exercise price per share shall be fixed by the Plan
Administrator but shall not be less than eighty-five percent (85%) of the
Fair Market Value per share of Common Stock on the option grant date,
provided that the Plan Administrator may fix the exercise price at less than
85% if the optionee, at the time of the option grant, shall have made a
payment to the Company (including payment made by means of a salary
reduction) equal to the excess of the Fair Market Value of the Common Stock
on the option grant date over such exercise price.

                                       4.



             2.  The exercise price shall become immediately due upon
exercise of the option and shall, subject to the provisions of Section I of
Article Four and the documents evidencing the option, be payable in one or
more of the forms specified below:

                   (i)  cash or check made payable to the Corporation,

                  (ii)  shares of Common Stock held for the requisite period
     necessary to avoid a charge to the Corporation's earnings for financial
     reporting purposes and valued at Fair Market Value on the Exercise Date,
     or

                 (iii)  to the extent the option is exercised for vested
     shares, through a special sale and remittance procedure pursuant to
     which the Optionee shall concurrently provide irrevocable written
     instructions to (a) a Corporation-designated brokerage firm to effect
     the immediate sale of the purchased shares and remit to the Corporation,
     out of the sale proceeds available on the settlement date, sufficient
     funds to cover the aggregate exercise price payable for the purchased
     shares plus all applicable Federal, state and local income and
     employment taxes required to be withheld by the Corporation by reason
     of such exercise and (b) the Corporation to deliver the certificates for
     the purchased shares directly to such brokerage firm in order to
     complete the sale.

         Except to the extent such sale and remittance procedure is utilized,
payment of the exercise price for the purchased shares must be made on the
Exercise Date.

         B.  EXERCISE AND TERM OF OPTIONS.  Each option shall be exercisable
at such time or times, during such period and for such number of shares as
shall be determined by the Plan Administrator and set forth in the documents
evidencing the option. However, no option shall have a term in excess of ten
(10) years measured from the option grant date.

         C.  EFFECT OF TERMINATION OF SERVICE.

             1.  The following provisions shall govern the exercise of any
options held by the Optionee at the time of cessation of Service or death:

                   (i)  Any option outstanding at the time of the Optionee's
     cessation of Service for any reason shall remain exercisable for such
     period of time thereafter as shall be determined by the Plan
     Administrator and set forth in the documents evidencing the option, but
     no such option shall be exercisable after the expiration of the option
     term.

                  (ii)  Any option exercisable in whole or in part by the
     Optionee at the time of death may be subsequently exercised by the
     personal representative of the Optionee's estate or by the person or
     persons to whom the option is transferred pursuant to the Optionee's
     will or in accordance with the laws of descent and distribution.


                                       5.


          (iii)  Should the Optionee's Service be terminated for Misconduct,
     then all outstanding options held by the Optionee shall terminate
     immediately and cease to be outstanding.

          (iv)   During the applicable post-Service exercise period, the
     option may not be exercised in the aggregate for more than the number of
     vested shares for which the option is exercisable on the date of the
     Optionee's cessation of Service. Upon the expiration of the applicable
     exercise period or (if earlier) upon the expiration of the option term,
     the option shall terminate and cease to be outstanding for any vested
     shares for which the option has not been exercised. However, the option
     shall, immediately upon the Optionee's cessation of Service, terminate
     and cease to be outstanding to the extent the option is not otherwise at
     that time exercisable for vested shares.

          2.  The Plan Administrator shall have complete discretion,
exercisable either at the time an option is granted or at any time while the
option remains outstanding, to:

          (i)    extend the period of time for which the option is to remain
     exercisable following the Optionee's cessation of Service from the
     limited exercise period otherwise in effect for that option to such
     greater period of time as the Plan Administrator shall deem appropriate,
     but in no event beyond the expiration of the option term, and/or

          (ii)   permit the option to be exercised, during the applicable
     post-Service exercise period, not only with respect to the number of
     vested shares of Common Stock for which such option is exercisable at
     the time of the Optionee's cessation of Service but also with respect to
     one or more additional installments in which the Optionee would have
     vested had the Optionee continued in Service.

          D.  STOCKHOLDER RIGHTS. The holder of an option shall have no
stockholder rights with respect to the shares subject to the option until
such person shall have exercised the option, paid the exercise price and
become a holder of record of the purchased shares.

          E.  REPURCHASE RIGHTS. The Plan Administrator shall have the
discretion to grant options which are exercisable for unvested shares of
Common Stock. Should the Optionee cease Service while holding such unvested
shares, the Corporation shall have the right to repurchase, at the exercise
price paid per share, any or all of those unvested shares. The terms upon
which such repurchase right shall be exercisable (including the period and
procedure for exercise and the appropriate vesting schedule for the purchased
shares) shall be established by the Plan Administrator and set forth in the
document evidencing such repurchase right.

                                       6.



          F.  LIMITED TRANSFERABILITY OF OPTIONS. During the lifetime of the
Optionee, Incentive Options shall be exercisable only by the Optionee and
shall not be assignable or transferable other than by will or by the laws of
descent and distribution following the Optionee's death. However, a
Non-Statutory Option may be assigned in whole or in part during the
Optionee's lifetime. The assigned portion may only be exercised by the person
or persons who acquire a proprietary interest in the option pursuant to the
assignment. The terms applicable to the assigned portion shall be the same as
those in effect for the option immediately prior to such assignment and shall
be set forth in such documents issued to the assignee as the Plan
Administrator may deem appropriate.

     II.  INCENTIVE OPTIONS

     The terms specified below shall be applicable to all Incentive Options.
Except as modified by the provisions of this Section II, all the provisions
of Articles One, Two and Four shall be applicable to Incentive Options.
Options which are specifically designated as Non-Statutory Options when
issued under the Plan shall NOT be subject to the terms of this Section II.

          A.  ELIGIBILITY. Incentive Options may only be granted to Employees.

          B.  EXERCISE PRICE. The exercise price per share shall not be less
than one hundred percent (100%) of the Fair Market Value per share of Common
Stock on the option grant date.

          C.  DOLLAR LIMITATION. The aggregate Fair Market Value of the
shares of Common Stock (determined as of the respective date or dates of
grant) for which one or more options granted to any Employee under the Plan
(or any other option plan of the Corporation or any Parent or Subsidiary) may
for the first time become exercisable as Incentive Options during any one
calendar year shall not exceed the sum of One Hundred Thousand Dollars
($100,000). To the extent the Employee holds two (2) or more such options
which become exercisable for the first time in the same calendar year, the
foregoing limitation on the exercisability of such options as Incentive
Options shall be applied on the basis of the order in which such options are
granted.

          D.  10% STOCKHOLDER. If any Employee to whom an Incentive Option is
granted is a 10% Stockholder, then the exercise price per share shall not be
less than one hundred ten percent (110%) of the Fair Market Value per share
of Common Stock on the option grant date, and the option term shall not
exceed five (5) years measured from the option grant date.

     III.  CORPORATE TRANSACTION/CHANGE IN CONTROL

          A.  In the event of any Corporate Transaction, each outstanding
option shall automatically accelerate so that each such option shall,
immediately prior to the effective date of the Corporate Transaction, become
fully exercisable with respect to the

                                       7.



total number of shares of Common Stock at the time subject to such option and
may be exercised for any or all of those shares as fully-vested shares of
Common Stock. However, an outstanding option shall not so accelerate if and
to the extent: (i) such option is, in connection with the Corporate
Transaction, either to be assumed by the successor corporation (or parent
thereof) or to be replaced with a comparable option to purchase shares of the
capital stock of the successor corporation (or parent thereof), (ii) such
option is to be replaced with a cash incentive program of the successor
corporation which preserves the spread existing on the unvested option shares
at the time of the Corporate Transaction and provides for subsequent payout
in accordance with the same vesting schedule applicable to those option
shares or (iii) the acceleration of such option is subject to other
limitations imposed by the Plan Administrator at the time of the option
grant. The determination of option comparability under clause (i) above shall
be made by the Plan Administrator, and its determination shall be final,
binding and conclusive.

          B.  All outstanding repurchase rights shall terminate
automatically, and the shares of Common Stock subject to those terminated
rights shall immediately vest in full, in the event of any Corporate
Transaction, except to the extent: (i) those repurchase rights are to be
assigned to the successor corporation (or parent thereof) in connection with
such Corporate Transaction or (ii) such accelerated vesting is precluded by
other limitations imposed by the Plan Administrator at the time the
repurchase right is issued.

          C.  Immediately following the consummation of the Corporate
Transaction, all outstanding options shall terminate and cease to be
outstanding, except to the extent assumed by the successor corporation (or
parent thereof).

          D.  Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation of such Corporate Transaction
had the option been exercised immediately prior to such Corporate
Transaction. Appropriate adjustments to reflect such Corporate Transaction
shall also be made to (i) the exercise price payable per share under each
outstanding option, PROVIDED the aggregate exercise price payable for such
securities shall remain the same, (ii) the maximum number and/or class of
securities available for issuance over the remaining term of the Plan and
(iii) the maximum number and/or class of securities for which any one person
may be granted stock options, separately exercisable stock appreciation
rights and direct stock issuances under the Plan per calendar year.

          E.  The Plan Administrator shall have full power and authority to
grant options under the Discretionary Option Grant Program which will
automatically accelerate in the event the Optionee's Service subsequently
terminates by reason of an Involuntary Termination within a designated period
(not to exceed eighteen (18) months) following the effective date of any
Corporate Transaction in which those options are assumed or replaced and do
not otherwise accelerate. Any options so accelerated shall remain exercisable
for fully-vested shares until the EARLIER of (i) the expiration of the option
term or (ii) the expiration of the one (1)-year period measured from the
effective date of the Involuntary

                                       8.



Termination. In addition, the Plan Administrator may provide that one or more
of the Corporation's outstanding repurchase rights with respect to shares
held by the Optionee at the time of such Involuntary Termination shall
immediately terminate, and the shares subject to those terminated repurchase
rights shall accordingly vest in full.

          F.  The Plan Administrator shall have full power and authority to
grant options under the Discretionary Option Grant Program which will
automatically accelerate in the event the Optionee's Service subsequently
terminates by reason of an Involuntary Termination within a designated period
(not to exceed eighteen (18) months) following the effective date of any
Change in Control. Each option so accelerated shall remain exercisable for
fully-vested shares until the EARLIER of (i) the expiration of the option
term or (ii) the expiration of the one (1)-year period measured from the
effective date of the Involuntary Termination. In addition, the Plan
Administrator may provide that one or more of the Corporation's outstanding
repurchase rights with respect to shares held by the Optionee at the time of
such Involuntary Termination shall immediately terminate, and the shares
subject to those terminated repurchase rights shall accordingly vest in full.

          G.  The portion of any Incentive Option accelerated in connection
with a Corporate Transaction or Change in Control shall remain exercisable as
an Incentive Option only to the extent the applicable One Hundred Thousand
Dollar limitation is not exceeded. To the extent such dollar limitation is
exceeded, the accelerated portion of such option shall be exercisable as a
Non-Statutory Option under the Federal tax laws.

          H.  The outstanding options shall in no way affect the right of the
Corporation to adjust, reclassify, reorganize or otherwise change its capital
or business structure or to merge, consolidate, dissolve, liquidate or sell
or transfer all or any part of its business or assets.

     IV.  CANCELLATION AND REGRANT OF OPTIONS

     The Plan Administrator shall have the authority to effect, at any time
and from time to time, with the consent of the affected option holders, the
cancellation of any or all outstanding options under the Discretionary Option
Grant Program and to grant in substitution new options covering the same or
different number of shares of Common Stock but with an exercise price per
share based on the Fair Market Value per share of Common Stock on the new
grant date.

     V.  STOCK APPRECIATION RIGHTS

          A.  The Plan Administrator shall have full power and authority to
grant to selected Optionees tandem stock appreciation rights and/or limited
stock appreciation rights.

          B.  The following terms shall govern the grant and exercise of
tandem stock appreciation rights:

                                       9.



          (i)    One or more Optionees may be granted the right, exercisable
     upon such terms as the Plan Administrator may establish, to elect
     between the exercise of the underlying option for shares of Common Stock
     and the surrender of that option in exchange for a distribution from the
     Corporation in an amount equal to the excess of (a) the Fair Market
     Value (on the option surrender date) of the number of shares in which
     the Optionee is at the time vested under the surrendered option (or
     surrendered portion thereof) over (b) the aggregate exercise price
     payable for such shares.

          (ii)   No such option surrender shall be effective unless it is
     approved by the Plan Administrator, either at the time of the actual
     option surrender or at any earlier time. If the surrender is so
     approved, then the distribution to which the Optionee shall be entitled
     may be made in shares of Common Stock valued at Fair Market Value on the
     option surrender date, in cash, or partly in shares and partly in cash,
     as the Plan Administrator shall in its sole discretion deem appropriate.

          (iii)  If the surrender of an option is not approved by the Plan
     Administrator, then the Optionee shall retain whatever rights the
     Optionee had under the surrendered option (or surrendered portion
     thereof) on the option surrender date and may exercise such rights at
     any time prior to the LATER of (a) five (5) business days after the
     receipt of the rejection notice or (b) the last day on which the option
     is otherwise exercisable in accordance with the terms of the documents
     evidencing such option, but in no event may such rights be exercised
     more than ten (10) years after the option grant date.

          C.  The following terms shall govern the grant and exercise of
limited stock appreciation rights:

          (i)    One or more Section 16 Insiders may be granted limited stock
     appreciation rights with respect to their outstanding options.

          (ii)   Upon the occurrence of a Hostile Take-Over, each individual
     holidng one or more options with such a limited stock appreciation right
     shall have the unconditional right (exercisable for a thirty (30)-day
     period following such Hostile Take-Over) to surrender each such option
     to the Corporation, to the extent the option is at the time exercisable
     for vested shares of Common Stock. In return for the surrendered option,
     the Optionee shall receive a cash distribution from the Corporation in
     an amount equal to the excess of (A) the Take-Over Price of the shares
     of Common Stock which are at the time vested under each surrendered
     option (or surrendered portion thereof) over (B) the aggregate exercise
     price payable for such shares. Such cash distribution shall be paid
     within five (5) days following the option surrender date.

                                       10.





               (iii)    Neither the approval of the Plan Administrator nor
     the consent of the Board shall be required in connection with such
     option surrender and cash distribution.

               (iv)     The balance of the option (if any) shall remaining
     outstanding and exercisable in accordance with the documents evidencing
     such option.


                                     ARTICLE THREE

                                 STOCK ISSUANCE PROGRAM

     1.    STOCK ISSUANCE TERMS

           Shares of Common Stock may be issued under the Stock Issuance
     Program through direct and immediate issuances without any intervening
     option grants. Each such stock issuance shall be evidenced by a Stock
     Issuance Agreement which complies with the terms specified below.

            A.   PURCHASE PRICE.

                 1.   The purchase price per share shall be fixed by the Plan
Administrator, but shall not be less than one hundred percent (100%) of the
Fair Market Value per share of Common Stock on the issuance date.

                 2.   Subject to the provisions of Section 1 of Article Four,
shares of Common Stock may be issued under the Stock Issuance Program for any
of the following items of consideration which the Plan Administrator may deem
appropriate in each individual instance:

                    (i)      cash or check made payable to the Corporation,
     or

                    (ii)     past services rendered to the Corporation (or
     any Parent or Subsidiary).

             B.  VESTING PROVISIONS.

                 1.   Shares of Common Stock issued under the Stock Issuance
Program may, in the discretion of the Plan Administrator, be fully and
immediately vested upon issuance or may vest in one or more installments over
the Participant's period of Service or upon attainment of specified
performance objectives. The elements of the vesting schedule applicable to
any unvested shares of Common Stock issued under the Stock Issuance Program,
namely:


                                     11.





              (i)     the Service period to be completed by the Participant
     or the performance objectives to be attained,

              (ii)    the number of installments in which the shares are to
     vest,

              (iii)   the interval or intervals (if any) which are to lapse
     between installments, and

              (iv)    the effect which death, Permanent Disability or other
     event designated by the Plan Administrator is to have upon the vesting
     schedule,

shall be determined by the Plan Administrator and incorporated into the Stock
Issuance Agreement.

              2.     Any new, substituted or additional securities or other
property (including money paid other than as a regular cash dividend) which
the Participant may have the right to receive with respect to the
Participant's unvested shares of Common Stock by reason of any stock
dividend, stock split, recapitalization, combination of shares, exchange of
shares or other change affecting the outstanding Common Stock as a class
without the Corporation's receipt of consideration shall be issued subject to
(i) the same vesting requirements applicable to the Participant's unvested
shares of Common Stock and (ii) such escrow arrangements as the Plan
Administrator shall deem appropriate.

              3.     The Participant shall have full stockholder rights with
respect to any shares of Common Stock issued to the Participant under the
Stock Issuance Program, whether or not the Participant's interest in those
shares is vested. Accordingly, the Participant shall have the right to vote
such shares and to receive any regular cash dividends paid on such shares.

              4.     Should the Participant cease to remain in Service while
holding one or more unvested shares of Common Stock issued under the Stock
Issuance Program or should the performance objectives not be attained with
respect to one or more such unvested shares of Common Stock, then those
shares shall be immediately surrendered to the Corporation for cancellation,
and the Participant shall have no further stockholder rights with respect to
those shares. To the extent the surrendered shares were previously issued to
the Participant for consideration paid in cash or cash equivalent (including
the Participant's purchase-money indebtedness), the Corporation shall repay
to the Participant the cash consideration paid for the surrendered shares and
shall cancel the unpaid principal balance of any outstanding purchase-money
note of the Participant attributable to the surrendered shares.

              5.     The Plan Administrator may in its discretion waive the
surrender and cancellation of one or more unvested shares of Common Stock
which would otherwise


                                   12.


occur upon the cessation of the Participant's Service or the non-attainment
of the performance objectives applicable to those shares. Such waiver shall
result in the immediate vesting of the Participant's interest in the shares
as to which the waiver applies. Such waiver may be effected at any time,
whether before or after the Participant's cessation of Service or the
attainment or non-attainment of the applicable performance objectives.

     II.     CORPORATE TRANSACTION/CHANGE IN CONTROL

             A.   All of the Corporation's outstanding repurchase/cancellation
rights under the Stock Issuance Program shall terminate automatically, and
all the shares of Common Stock subject to those terminated rights shall
immediately vest in full, in the event of any Corporate Transaction, except
to the extent (i) those repurchase/cancellation rights are to be assigned to
the successor corporation (or parent thereof) in connection with such
Corporate Transaction or (ii) such accelerated vesting is precluded by other
limitations imposed in the Stock Issuance Agreement.

             B.   The Plan Administrator shall have the discretionary
authority, exercisable either at the time the unvested shares are issued or
any time while the Corporation's repurchase/cancellation rights remain
outstanding under the Stock Issuance Program, to provide that those rights
shall automatically terminate in whole or in part, and the shares of Common
Stock subject to those terminated rights shall immediately vest, in the event
the Participant's Service should subsequently terminate by reason of an
Involuntary Termination within a designated period (not to exceed eighteen
(18) months) following the effective date of any Corporate Transaction in
which those repurchase/cancellation rights are assigned to the successor
corporation (or parent thereof).

             C.   The Plan Administrator shall have the discretionary
authority, exercisable either at the time the unvested shares are issued or
any time while the Corporation's repurchase/cancellation rights remain
outstanding under the Stock Issuance Program, to provide that those rights
shall automatically terminate in whole or in part, and the shares of Common
Stock subject to those terminated rights shall immediately vest, in the event
of the Participant's Service should subsequently terminate by reason of an
Involuntary Termination within a designated period (not to exceed eighteen
(18) months) following the effective date of any Change in Control.

   III.     SHARE ESCROW/LEGENDS

            Unvested shares may, in the Plan Administrator's discretion, be
held in escrow by the Corporation until the Participant's interest in such
shares vests or may be issued directly to the Participant with restrictive
legends on the certificates evidencing those unvested shares.


                                       13.





                                 ARTICLE FOUR

                                 MISCELLANEOUS


     I.     FINANCING

            The Plan Administrator may permit any Optionee or Participant to
pay the option exercise price under the Discretionary Option Grant Program or
the purchase price of shares issued under the Stock Issuance Program by
delivering a full-recourse, interest bearing promissory note payable in one
or more installments. The terms of any such promissory note (including the
interest rate and the terms of repayment) shall be established by the Plan
Administrator in its sole discretion. In no event may the maximum credit
available to the Optionee or Participant exceed the sum of (i) the aggregate
option exercise price or purchase price payable for the purchased shares plus
(ii) any Federal, state and local income and employment tax liability
incurred by the Optionee or the Participant in connection with the option
exercise or share purchase.

     II.    TAX WITHHOLDING

            A.   The Corporation's obligation to deliver shares of Common
Stock upon the exercise of options or the issuance or vesting or such shares
under the Plan shall be subject to the satisfaction of all applicable
Federal, state and local income and employment tax withholding requirements.

            B.   The Plan Administrator may, in its discretion, provide any
or all holders of Non-Statutory Options or unvested shares of Common Stock
under the Plan with the right to use shares of Common Stock in satisfaction
of all or part of the Taxes incurred by such holders in ocnnection with the
exercise of their options or the vesting of their shares. Such right may be
provided to any such holder in either or both of the following formats:

                 STOCK WITHHOLDING:  The election to have the Corporation
withhold, from the shares of Common Stock otherwise issuable upon the
exercise of such Non-Statutory Option or the vesting of such shares, a portion
of those shares with an aggregate Fair Market Value equal to the percentage
of the Taxes (not to exceed one hundred percent (100%)) designated by the
holder.

                 STOCK DELIVERY:  The election to delivery to the
Corporation, at the time the Non-Statutory Option is exercised or the shares
vest, one or more shares of Common Stock previously acquired by such holder
(other than in connection with the option exercise or share vesting
triggering the Taxes) with an aggregate Fair Market Value equal to the
percentage of the Taxes (not to exceed one hundred percent (100%)) designated
by the holder.


                                      14.





   III.     EFFECTIVE DATE AND TERM OF THE PLAN

            A.     The Plan shall become effective immediately upon the
Plan Effective Date. Options may be granted under the Discretionary Option
Grant at any time on or after the Plan Effective Date. However, no options
granted under the Plan may be exercised, and no shares shall be issued under
the Plan, until the Plan is approved by the Corporation's stockholders. If
such stockholder approval is not obtained within twelve (12) months after the
Plan Effective Date, then all options previously granted under this Plan
shall terminate and cease to be outstanding, and no further options shall be
granted and no shares shall be issued under the Plan.

            B.     The Plan shall terminate upon the EARLIEST of (i) the
tenth anniversary of the Plan Effective Date, (ii) the date on which all
shares available for issuance under the Plan shall have been issued as
fully-vested shares or (iii) the termination of all outstanding options in
connection with a Corporate Transaction. Upon such plan termination, all
outstanding option grants and unvested stock issuances shall thereafter
continue to have force and effect in accordance with the provisions of the
documents evidencing such grants or issuances.

     IV.    AMENDMENT OF THE PLAN

            A.   The Board shall have complete and exclusive power and
authority to amend or modify the Plan in any or all respects. However, no
such amendment or modification shall adversely affect the rights and
obligations wiht respect to stock options or unvested stock issuances at the
time outstanding under the Plan unless the Optionee or the Participant
consents to such amendment or modification. In addition, certain amendments
may require stockholder approval if so determined by the Board or pursuant to
applicable laws or regulations.

            B.   Options to purchase shares of Common Stock may be granted
under the Discretionary Option Grant and shares of Common Stock may be issued
under the Stock Issuance Program that are in each instance in excess of the
number of shares then available for issuance under the Plan, provided any
excess shares actually issued under those programs shall be held in escrow
until there is obtained any required approval of an amendment sufficiently
increasing the number of shares of Common Stock available for issuance under
the Plan. If such approval is not obtained within twelve (12) months after
the date the first such excess issuances are made, then (i) any unexercised
options granted on the basis of such excess shares shall terminate and cease
to be outstanding and (ii) the Corporation shall promptly refund to the
Optionees and the Participants the exercise or purchase price paid for any
excess shares issued under the Plan and held in escrow, together with
interest (at the applicable Short Term Federal Rate) for the period the
shares were held in escrow, and such shares shall thereupon be automatically
cancelled and cease to be outstanding.


                                       15.














   V.   USE OF PROCEEDS

        Any cash proceeds received by the Corporation form the sale of shares
of Common Stock under the Plan shall be used for general corporate purposes.

  VI.   REGULATORY APPROVALS

        A.  The implementation of the Plan, the granting of any stock option
under the Plan and the issuance of any shares of Common Stock (i) upon the
exercise of any granted option or (ii) under the Stock Issuance Program
shall be subject to the Corporation's procurement of all approvals and
permits required by regulatory authorities having jurisdiction over the Plan,
the stock options granted under it and the shares of Common Stock issued
pursuant to it.

        B.  No shares of Common Stock or other assets shall be issued or
delivered under the Plan unless and until there shall have been compliance
with all applicable requirements of Federal and state securities laws,
including the filing and effectiveness of the Form S-8 registration
statement for the shares of Common Stock issuable under the Plan, and all
applicable listing requirements of any stock exchange (or the Nasdaq National
Market, if applicable) on which Common Stock is then listed for trading.

 VII.   NO EMPLOYMENT/SERVICE RIGHTS

        Nothing in the Plan shall confer upon the Optionee or the Participant
any right to continue in Service for any period of specific duration or
interfere with or otherwise restrict in any way the rights of the Corporation
(or any Parent or Subsidiary employing or retaining such person) or of the
Optionee or the Participant, which rights are hereby expressly reserved by
each, to terminate such person's Service at any time for any reason, with or
without cause.

              [Remainder of This Page Intentionally Left Blank]


                                      16.





                                   APPENDIX


         The following definitions shall be in effect under the Plan:

     A.  BOARD shall mean the Corporation's Board of Directors.

     B.  CHANGE IN CONTROL shall mean a change in ownership or control of the
Corporation effected through either of the following transactions:

              (i)  the acquisition, directly or indirectly by any person or
     related group of persons (other than the Corporation or a person that
     directly or indirectly controls, is controlled by, or is under common
     control with, the Corporation), of beneficial ownership (within the
     meaning of Rule 13d-3 of the 1934 Act) of securities possessing more
     than fifty percent (50%) of the total combined voting power of the
     Corporation's outstanding securities pursuant to a tender or exchange
     offer made directly to the Corporation's stockholders which the Board
     does not recommend such stockholders to accept, or

             (ii)  a change in the composition of the Board over a period of
     thirty-six (36) consecutive months or less such that a majority of the
     Board members ceases, by reason of one or more contested elections for
     Board membership, to be comprised of individuals who either (A) have
     been Board members continuously since the beginning of such period or
     (B) have been elected or nominated for election as Board members during
     such period by at least a majority of the Board members described in
     clause (A) who were still in office at the time the Board approved such
     election or nomination.

     C.  CODE shall mean the Internal Revenue Code of 1986, as amended.

     D.  COMMON STOCK shall mean the Corporation's common stock.

     E.  CORPORATE TRANSACTION shall mean either of the following
stockholder-approved transactions to which the Corporation is a party:

              (i)  a merger or consolidation in which securities possessing
     more than fifty percent (50%) of the total combined voting power of the
     Corporation's outstanding securities are transferred to a person or
     persons different from the persons holding those securities immediately
     prior to such transaction, or


                                      A-1




             (ii)  the sale, transfer or other disposition of all or
     substantially all of the Corporation's assets in complete liquidation or
     dissolution of the Corporation.

     F.  CORPORATION shall mean Communication TeleSystems International, a
California corporation, and its successors.

     G.  DISCRETIONARY OPTION GRANT PROGRAM shall mean the discretionary
option grant program in effect under the Plan.

     H.  EMPLOYEE shall mean an individual who is in the employ of the
Corporation (or any Parent or Subsidiary), subject to the control and
direction of the employer entity as to both the work to be performed and the
manner and method of performance.

     I.  EXERCISE DATE shall mean the date on which the Corporation shall
have received written notice of the option exercise.

     J.  FAIR MARKET VALUE per share of Common Stock on any relevant date
shall be determined in accordance with the following provisions:

              (i)  If the Common Stock is at the time traded on the Nasdaq
     National Market, then the Fair Market Value shall be deemed equal to the
     closing selling price per share of Common Stock on the date in question,
     as such price is reported on the Nasdaq National Market or any successor
     system. If there is no closing selling price for the Common Stock on the
     date in question, then the Fair Market Value shall be the closing
     selling price on the last preceding date for which such quotation exists.

             (ii)  If the Common Stock is at the time listed on any Stock
     Exchange, then the Fair Market Value shall be deemed equal to the
     closing selling price per share of Common Stock on the date in question
     on the Stock Exchange determined by the Plan Administrator to be the
     primary market for the Common Stock, as such price is officially quoted
     in the composite tape of transactions on such exchange. If there is no
     closing selling price for the Common Stock on the date in question,
     then the Fair Market Value shall be the closing selling price on the
     last preceding date for which such quotation exists.

            (iii)  For purposes of any option grants made on the Underwriting
     Date, the Fair Market Value shall be deemed to be equal to the price per
     share at which the Common Stock is to be sold in the initial public
     offering pursuant to the Underwriting Agreement.


                                      A-2




             (iv)  For purposes of any option grants made prior to the
     Underwriting Date, the Fair Market Value shall be determined by the Plan
     Administrator, after taking into account such factors as it deems
     appropriate.

     K.  HOSTILE TAKE-OVER shall mean the acquisition, directly or
indirectly, by any person or related group of persons (other than the
Corporation or a person that directly or indirectly controls, is controlled
by, or is under common control with, the Corporation) of beneficial ownership
(within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing
more than fifty percent (50%) of the total combined voting power of the
Corporation's outstanding securities pursuant to a tender or exchange offer
made directly to the Corporation's stockholders which the Board does not
recommend such stockholders to accept.

     L.  INCENTIVE OPTION shall mean an option which satisfies the
requirements of Code Section 422.

     M.  INVOLUNTARY TERMINATION shall mean the termination shall mean the
termination of the Service of any individual which occurs by reason of:

              (i)  such individual's involuntary dismissal or discharge by
     the Corporation for reasons other than Misconduct, or

             (ii)  such individual's voluntary resignation following (A) a
     change in his or her position with the Corporation which materially
     reduces his or her level of responsibility, (B) a reduction in his or
     her level of compensation (including base salary, fringe benefits and
     participation in any corporate-performance based bonus or incentive
     programs) by more than fifteen percent (15%) or (C) a relocation of such
     individual's place of employment by more than fifty (50) miles, provided
     and only if such change, reduction or relocation is effected by the
     Corporation without the individual's consent.

     N.  MISCONDUCT shall mean the commission of any act of fraud,
embezzlement or dishonesty by the Optionee or Participant, any unauthorized
use or disclosure by such person of confidential information or trade secrets
of the Corporation (or any Parent or Subsidiary), or any other intentional
misconduct by such person adversely affecting the business or affairs of the
Corporation (or any Parent or Subsidiary) in a material manner. The foregoing
definition shall not be deemed to be inclusive of all the acts of omissions
which the Corporation (or any Parent or Subsidiary) may consider as grounds
for the dismissal or discharge of any Optionee, Participant or other person
in the Service of the Corporation (or any Parent or Subsidiary).

     O.  1934 ACT shall mean the Securities Exchange Act of 1934, as amended.


                                      A-3




     P.  NON-STATUTORY OPTION shall mean an option not intended to satisfy
the requirements of Code Section 422.

     Q.  OPTIONEE shall mean any person to whom an option is granted under
the Discretionary Option Grant Program.

     R.  PARENT shall mean any corporation (other than the Corporation) in an
unbroken chain of corporations ending with the Corporation, provided each
corporation in the unbroken chain (other than the Corporation) owns, at the
time of the determination, stock possessing fifty percent (50%) or more of
the total combined voting power of all classes of stock in one of the other
corporations in such chain.

     S.  PARTICIPANT shall mean any person who is issued shares of Common
Stock under the Stock Issuance Program.

     T.  PERMANENT DISABILITY OR PERMANENTLY DISABLED shall mean the
inability of the Optionee or the Participant to engage in any substantial
gainful activity by reason of any medically determinable physical or mental
impairment expected to result in death or to be of continuous duration of
twelve (12) months or more.

     U.  PLAN shall mean the Corporation's 1996 Stock Option/Stock Issuance
Plan, as set forth in this document.

     V.  PLAN ADMINISTRATOR shall mean the particular entity, whether the
Primary Committee, the Board or the Secondary Committee, which is authorized
to administer the Discretionary Option Grant and Stock Issuance Programs with
respect to one or more classes of eligible persons, to the extent such entity
is carrying out its administrative functions under those programs with
respect to one or more classes of eligible persons, to the extent such entity
is carrying out its administrative functions under those programs with
respect to the persons under its jurisdiction.

     W.  PLAN EFFECTIVE DATE shall mean the date on which the Plan was
adopted by the Board.

     X.  PRIMARY COMMITTEE shall mean the committee of two (2) or more
non-employee Board members appointed by the Board to administer the
Discretionary Option Grant and Stock Issuance Programs with respect to
Section 16 Insiders.

     Y.  SECONDARY COMMITTEE shall mean a committee of two (2) or more Board
members appointed by the Board to administer the Discretionary Option Grant
and Stock Issuance Programs with respect to eligible persons other than
Section 16 Insiders.

     Z.  SECTION 12 REGISTRATION DATE shall mean the date on which the Common
Stock is first registered under Section 12(g) or Section 15 of the 1934 Act.

     AA.  SECTION 16 INSIDER shall mean an officer or director of the
Corporation subject to the short-swing profit liabilities of Section 16 of
the 1934 Act.


                                      A-4





     AB.  SERVICE shall mean the performance of services for the Corporation
(or any Parent or Subsidiary) by a person in the capacity of an Employee, a
non-employee member of the board of directors or a consultant or independent
advisor, except to the extent otherwise specifically provided in the
documents evidencing the option grant or stock issuance.

     AC.  STOCK EXCHANGE shall mean either the American Stock Exchange or the
New York Stock Exchange.

     AD.  STOCK ISSUANCE AGREEMENT shall mean the agreement entered into by
the Corporation and the Participant at the time of issuance of shares of
Common Stock under the Stock Issuance Program.

     AE.  STOCK ISSUANCE PROGRAM shall mean the stock issuance program in
effect under the Plan.

     AF.  SUBSIDIARY shall mean any corporation (other than the Corporation)
in an unbroken chain of corporations beginning with the Corporation, provided
each corporation (other than the last corporation) in the unbroken chain
owns, at the time of the determination, stock possessing fifty percent (50%)
or more of the total combined voting power of all classes of stock in one of
the other corporations in such chain.

     AG.  TAKE-OVER PRICE shall mean the GREATER of (i) the Fair Market Value
per share of Common Stock on the date the option is surrendered to the
Corporation in connection with a Hostile Take-Over or (ii) the highest
reported price per share of Common Stock paid by the tender offeror in
effecting such Hostile Take-Over. However, if the surrendered option is an
Incentive Option, the Take-Over Price shall not exceed the clause (i) price
per share.

     AH.  TAXES shall mean the Federal, state and local income and employment
tax liabilities incurred by the holder of Non-Statutory Options or unvested
shares of Common Stock in connection with the exercise of those options or
the vesting of those shares.

     AL.  10% STOCKHOLDER shall mean the owner of stock (as determined under
Code Section 424(d)) possessing more than ten percent (10%) of the total
combined voting power of all classes of stock of the Corporation (or any
Parent or Subsidiary).

     AJ.  UNDERWRITING AGREEMENT shall mean the agreement between the
Corporation and the underwriter or underwriters managing the initial public
offering of the Common Stock.

     AK.  UNDERWRITING DATE shall mean the date on which the Underwriting
Agreement is executed and priced in connection with an initial public
offering of the Common Stock.

                                      A-5.