Document:

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                           INDEMNIFICATION AGREEMENT

     THIS INDEMNIFICATION AGREEMENT (this "Agreement") is made as of the  ____
day of ___________,  1999, by and between Advanced Switching Communications,
Inc., a Delaware corporation (the "Corporation"), and  __________________
("Indemnitee"), a director of the Corporation.

                                   RECITALS:

     A.   It is essential to the Corporation to retain and attract as directors
and officers of the Corporation the most capable persons available.

     B.   The substantial increase in corporate litigation subjects directors
and officers to expensive litigation risks at the same time that the
availability of directors' and officers' liability insurance has been severely
limited.

     C.   It is the express policy of the Corporation to indemnify directors and
officers of the Corporation so as to provide them with the maximum possible
protection permitted by law.

     D.   Indemnitee does not regard the protection available under the Delaware
General Corporation Law or the Bylaws of the Corporation as adequate in the
present circumstances, and may not be willing to serve or continue to serve as a
director or officer without adequate protection, and the Corporation desires
Indemnitee to serve in such capacity.

                                   AGREEMENTS

     NOW, THEREFORE, the Corporation and Indemnitee do hereby agree as follows:

     1.   Agreement to Serve

          Indemnitee agrees to serve or continue to serve as a director and/or
an officer of the Corporation for so long as he is duly elected or appointed or
until such time as he tenders his resignation in writing.

          The term "Proceeding" shall include any threatened, pending or
completed action, suit, investigation or proceeding, and any appeal thereof,
whether brought by or in the right of the Corporation or otherwise and whether
civil, criminal, administrative or investigative, and/or any inquiry or
investigation, in which Indemnitee may be or may have been involved as a party
or otherwise, or that Indemnitee in good faith believes might lead to the
institution of any such proceeding, by reason of the fact that Indemnitee is or
was a director or officer of the Corporation, by reason of any action taken by
him or

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of any inaction on his part while acting as such a director or officer, or by
reason of the fact that he is or was serving at the request of the Corporation
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise; in each case whether or not he is
acting or serving in any such capacity at the time any liability or expense is
incurred for which indemnification or reimbursement can be provided under this
Agreement.

          The term "Expenses" shall include, without limitation, expenses, costs
and obligations, paid or incurred, of investigations, judicial or administrative
proceedings or appeals, amounts paid in settlement by or on behalf of
Indemnitee, attorneys' fees and disbursements and any expenses reasonably and
actually incurred in establishing a right to indemnification under Section 8 of
this Agreement [including, without limitation, those incurred in investigating,
defending, being a witness in or participating in (including an appeal), or
preparing to defend with respect to any claim, issue or matter relating thereto
or in connection therewith], but shall not include the amount of judgments,
fines or penalties against Indemnitee.

          A "Change in Control" shall be deemed to have occurred if, after the
date hereof, there is any transaction or series of transactions within any
twelve (12)-month period, including, without limitation, a merger, consolidation
or exchange of securities, in which the holders of all of the Corporation's
outstanding voting securities immediately prior to the consummation of such
transaction or the first transaction of such series of transactions do not own,
directly or indirectly, a majority of the combined voting power of the
Corporation's outstanding securities upon consummation of such transaction or
series of such transactions.

          The term "Independent Legal Counsel" shall include any attorney or
firm of attorneys, selected in accordance with Section 5 hereof, who shall not
have otherwise performed services for the Corporation or Indemnitee within the
five years prior to the date of selection (other than with respect to matters
concerning the rights of Indemnitee under this Agreement, or of other
Indemnitees under similar indemnification agreements).

          References to "other enterprise" shall include employee benefit plans;
reference to "fines" shall include any excise tax assessed with respect to any
employee benefit plan; and references to "serving at the request of the
Corporation" shall include any service as a director, officer, employee or agent
of the Corporation or any subsidiary which imposes duties on, or involves
services by, such director, officer, employee, or agent with respect to an
employee benefit plan, its participants or beneficiaries.

     2.   Indemnity in Third-Party Proceedings.

          The Corporation shall indemnify Indemnitee in accordance with the
provisions of this Agreement if Indemnitee is a party to or threatened to be
made a party to any Proceeding (other than a Proceeding by or in the right of
the Corporation or any

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subsidiary of the Corporation to procure a judgment in its favor) by reason of
the fact that Indemnitee is or was a director or officer of the Corporation, or
is or was serving at the request of the Corporation as a director, officer,
employee, or agent of another corporation, partnership, joint venture, trust or
other enterprise, against all Expenses, judgments, fines and penalties actually
and reasonably incurred by Indemnitee in connection with the defense or
settlement of such Proceeding, but only if he acted in good faith and in a
manner which he reasonably believed to be (in the case of conduct in his
official capacity) in the best interests of the Corporation or (in all other
cases) not opposed to the best interests of the Corporation, and, in the case of
a criminal action or proceeding, in addition, had no reasonable cause to believe
that his conduct was unlawful. The termination of any such Proceeding by
judgment, order of court, settlement, conviction, or upon a plea of nolo
contendere, or its equivalent, shall not, of itself, create a presumption that
Indemnitee did not act in good faith and in a manner which he reasonably
believed to be in or not opposed to the best interests of the Corporation (or
that Indemnitee did not meet any other particular standard of conduct or have
any other particular belief or that a court has determined that indemnification
is not permitted by applicable law), and with respect to any criminal
proceeding, that such person had reasonable cause to believe that his conduct
was unlawful.

     3.   Indemnity in Proceedings by or in the Right of the Corporation

          The Corporation shall indemnify Indemnitee in accordance with the
provisions of this Agreement if Indemnitee is a party to or threatened to be
made a party to any Proceeding by or in the right of the Corporation or any
subsidiary of the Corporation to procure a judgment in its favor by reason of
the fact that Indemnitee is or was a director or officer of the Corporation or
any subsidiary of the Corporation, or is or was serving at the request of the
Corporation as a director, officer, employee, or agent of another corporation,
partnership, joint venture, trust or other enterprise, against all Expenses
actually and reasonably incurred by Indemnitee in connection with the defense or
settlement of such Proceeding, but only if he acted in good faith and in a
manner which he reasonably believed to be (in the case of conduct in his
official capacity) in the best interests of the Corporation or (in all other
cases) not opposed to the best interests of the Corporation, except that no
indemnification for Expenses shall be made under this Section 4, in respect of
any Proceeding as to which Indemnitee shall have been adjudged to be liable to
the Corporation, unless and only to the extent that any court in which such
Proceeding was brought shall determine upon application that, despite the
adjudication of liability but in view of all the circumstances of the case,
Indemnitee is fairly and reasonably entitled to indemnity for such expenses as
such court shall deem proper. Notwithstanding the foregoing, Indemnitee shall
have no right to indemnification for Expenses and the payment of profits arising
from the purchase and sale by Indemnitee of securities in violation of Section
16(b) of the Securities Exchange Act of 1934, as amended.

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     4.   Change in Control

          The Corporation agrees that in the event of a Change in Control, and
with respect to all matters thereafter arising concerning the rights of
Indemnitee to indemnification and payment of Expenses under this Agreement or
any other agreement to which the Corporation and Indemnitee are parties or the
Bylaws of the Corporation or any subsidiary as hereafter in effect relating to
indemnification of directors and/or officers of the Corporation or any such
subsidiary, the Corporation shall seek legal advice only from the Independent
Legal Counsel selected by Indemnitee and approved by the Corporation (which
approval shall not be unreasonably withheld). Such counsel, among other things,
shall render its written opinion to the Corporation and Indemnitee as to
whether and to what extent Indemnitee would be permitted to be indemnified
under applicable law. The Corporation agrees to pay the reasonable fees of the
Independent Legal Counsel referred to above and to indemnify fully such counsel
against any and all expenses (including attorney's fees), claims, liabilities
and damages arising out of or relating to this Agreement or its engagement
pursuant hereto.

     5.   Indemnification Prohibited. Notwithstanding the provisions of
Sections 3 and 4, no indemnification shall be made in connection with any
Proceeding charging improper personal benefit to Indemnitee, whether or not
involving action in his official capacity, in which he was adjudged liable on
the basis that personal benefit was improperly received by Indemnitee.

     6.   Indemnification of Expenses of Successful Party. Notwithstanding any
other provision of this Agreement whatsoever, to the extent that Indemnitee has
been successful on the merits or otherwise (including a settlement) in defense
of any Proceeding or in defense of any claim, issue or matter therein,
including dismissal without prejudice, Indemnitee shall be indemnified against
all Expenses reasonably and actually incurred in connection therewith.

     7.   Advances of Expenses. Expenses incurred by Indemnitee pursuant to
Sections 3 and  4 in any Proceeding shall be paid by the Corporation in advance
as soon as practicable but not later than three business days after receipt of
the written request of Indemnitee provided that Indemnitee shall (i) affirm in
such written request that he acted in good faith and in a manner which he
reasonably believed to be (in the case of conduct in his official capacity) in
the best interests of the Corporation or (in all other cases) not opposed to the
best interests of the Corporation and (ii) undertake to repay such amount to the
extent that is ultimately determined that Indemnitee is not entitled to
indemnification, and further provided that a determination has been made that
the facts then known would not preclude indemnification pursuant to the terms of
this Agreement.

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     8.   Right of Indemnitee to Indemnification Upon Application; Procedure
Upon Application

          Any indemnification under Sections 3 and 4 shall be made as soon as
practicable but in any event no later than 30 days after receipt by the
Corporation of the written request of Indemnitee.

          The right to indemnification or advances as provided by this Agreement
shall be enforceable by Indemnitee in any court of competent jurisdiction. The
burden of proving that indemnification or advances are not appropriate shall be
on the Corporation. Neither the failure of the Corporation (including its Board
of Directors, independent legal counsel, or stockholders) to have made a
determination prior to the commencement of such action that indemnification or
advances are proper in the circumstances because Indemnitee has met the
applicable standard of conduct, nor an actual determination by the Corporation
(including its Board of Directors, independent legal counsel, or stockholders)
that Indemnitee has not met such applicable standard conduct, shall be a defense
to the action or create a presumption that Indemnitee has not met the applicable
standard of conduct. Indemnitee's expenses reasonably incurred in connection
with successfully establishing Indemnitee's right to indemnification or
advances, in whole or in part, in any such Proceeding shall also be indemnified
by the Corporation.

          The Corporation shall not be liable under this Agreement to make any
payment in connection with any claim made against Indemnitee to the extent
Indemnitee has otherwise actually received payment (under any insurance policy,
Bylaw or otherwise) of the amounts otherwise indemnifiable.

     9.   Indemnification Hereunder Not Exclusive

          Notwithstanding any other provision of this Agreement, the Corporation
hereby agrees to indemnify Indemnitee to the full extent permitted by law,
whether or not such indemnification is specifically authorized by the other
provisions of this Agreement, the Corporation's Certificate of Incorporation,
the Bylaws, or by statute. In the event of any changes, after the date of this
Agreement, in any applicable law, statute, or rule which expand the right of a
Delaware corporation to indemnify a member of its board of directors or any
officer, such changes shall be, ipso facto, within the purview of Indemnitee's
rights, and Corporation's obligations, under this Agreement. In the event of any
changes in any applicable law, statute, or rule which narrow the right of a
Delaware corporation to indemnify a member of its board of directors or any
officer, such changes, to the extent not otherwise required by such law, statute
or rule to be applied to this Agreement, shall have no effect on this Agreement
or the parties' rights and obligations hereunder.

          The indemnification provided by this Agreement shall not be deemed
exclusive of any other rights to which Indemnitee may be entitled under the
Certificate of Incorporation, the Bylaws, any agreement, any vote of
shareholders or disinterested

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directors, the laws of the State of Delaware or otherwise, both as to action in
his official capacity and as to action in another capacity while holding such
office.

     10.  Partial Indemnification

          If Indemnitee is entitled under any provision of this Agreement to
indemnification by the Corporation for some or a portion of the Expenses,
judgments, fines or penalties actually and reasonably incurred by him in the
investigation, defense, appeal or settlement of any Proceeding but not, however,
for the total amount thereof, the Corporation shall nevertheless indemnify
Indemnitee for the portion of such Expenses, judgments, fines or penalties to
which Indemnitee is entitled. Moreover, notwithstanding any other provision of
this Agreement, to the extent that Indemnitee has been successful on the merits
or otherwise in defense of any or all claims, issues or matters relating in
whole or in part to an indemnifiable event, occurrence or matter hereunder,
including dismissal without prejudice, Indemnitee shall be indemnified against
all Expenses incurred in connection with such defenses.

     11.  Effect of Federal Law

          Both the Corporation and Indemnitee acknowledge that in certain
instances, federal law will override Delaware law and prohibit the Corporation
from indemnifying its offices and directors. For example, the Corporation and
Indemnitee acknowledge that the Securities and Exchange Commission has taken the
position that indemnification is not permissible for liabilities arising under
certain federal securities law, and federal law prohibits indemnification for
certain violations of the Employee Retirement Income Security Act.

     12.  Liability Insurance

          The Corporation shall from time to time make the good faith
determination whether or not it is practicable for the Corporation to obtain and
maintain a policy or policies of insurance with reputable insurance companies
providing the officers and directors with coverage for losses from wrongful
acts, or to ensure the Corporation's performance of its indemnification
obligations under this Agreement. Among other considerations, the Corporation
will weigh the costs of obtaining such insurance against the protection afforded
by such coverage.

          Indemnitee hereby releases the Corporation and its respective
authorized representatives from any claims for indemnification hereunder if and
to the extent that Indemnitee receives proceeds from any liability insurance
policy or other third-party source in payment or reimbursement for such claims.
Indemnitee hereby agrees to assign all proceeds Indemnitee receives under any
such insurance policy or third-party agreement to the extent of the amount of
indemnification made to Indemnitee under the terms of this Agreement. Finally,
Indemnitee shall cause each insurance policy or other third-party agreement by
which Indemnitee may be entitled to payment or reimbursement

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to provide that the insurance company or the third-party agreement by which
Indemnitee may be entitled to payment or reimbursement to provide that the
insurance company or the third party waives all right of recovery by way of
subrogation against the Corporation in connection with any claim for
indemnification under this Agreement. If such waiver of subrogation cannot be
obtained except with the payment of additional sums in premiums or otherwise,
Indemnitee shall notify the Corporation of this fact. The Corporation shall
then have ten (10) days after receiving such notice to agree to pay such
additional sums. If a waiver of subrogation rights is not obtainable at any
price or if the Corporation shall fail to agree to pay such additional sums,
Indemnitee shall be relieved of the obligation to obtain the waiver of
subrogation rights with respect to any particular insurance policy or
third-party agreement.

     13.  Saving Clause

          Nothing in this Agreement is intended to require or shall be
construed as requiring the Corporation to do or fail to do any act in violation
of applicable law. The provisions of this Agreement (including any provision
within a single section, paragraph or sentence) shall be severable in
accordance with this Section 14. If this Agreement or any portion thereof shall
be invalidated on any ground by any court of competent jurisdiction, the
Corporation shall nevertheless indemnify Indemnitee as to Expenses, judgments,
fines and penalties with respect to any Proceeding to the full extent permitted
by any applicable portion of this agreement that shall not have been
invalidated or by any other applicable law, and this Agreement shall remain
enforceable to the fullest extent permitted by law.

     14.  Notice

          Indemnitee shall, as a condition precedent to his right to be
indemnified under this Agreement, give to the Corporation notice in writing as
soon as practicable of any claim made against him for which indemnity will or
could be sought under this Agreement. Notice to the Corporation shall be
directed to Advanced Switching Communications, Inc., 8330 Boone Blvd., 5th
Floor, Vienna, VA 22182 Attention: President (or such other address as the
Corporation shall designate in writing to Indemnitee). All notices, requests,
demands and other communications shall be deemed received three days after the
date postmarked if (i) delivered by hand and receipted for by the party to whom
such notice or other communication shall have been directed, or (ii) sent by
prepaid mail, properly addressed. In addition, Indemnitee shall give the
Corporation such information and cooperation as it may reasonably require and
shall be within Indemnitee's power.

     15.  Applicable Law

          This Agreement shall be governed by and construed in accordance with
the substantive laws of the State of Delaware without giving effect to its
rules of conflicts of laws.

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     16.  Successors and Assigns

          This Agreement shall be binding upon and inure to the benefit of and
be enforceable by the parties and their respective successors and assigns
(including any direct or indirect successors by purchase, merger, consolidation
or otherwise to all or substantially all of the business and/or assets of the
Corporation), spouses, heirs, and personal and legal representatives. The
Corporation shall require and cause any successor (whether direct or indirect
by purchase, merger, consolidation or otherwise) to all, substantially all or a
substantial part, of the business and/or assets of the Corporation, by written
agreement in form and substance satisfactory to Indemnitee, expressly to assume
and agree to perform this Agreement in the same manner and to the same extent
that the Corporation would be required to perform if no such succession had
taken place. This Agreement shall continue in effect regardless of whether
Indemnitee continues to serve as a director and/or officer of the Corporation
or of any other enterprise.

     17.  Attorney's Fees

          In the event that any action is instituted by Indemnitee under this
Agreement to enforce or interpret any of the terms hereof, Indemnitee shall be
entitled to be paid all court costs and expenses, including reasonable
attorneys' fees and disbursements, incurred by Indemnitee with respect to such
action, unless as a part of such action, the court of competent jurisdiction
determines that each of the material assertions made by Indemnitee as a basis
for such action were not made in good faith or were frivolous. In the event of
an action instituted by or in the name of the Corporation under this Agreement
or to enforce or interpret any of the terms of this Agreement, Indemnitee shall
be entitled to be paid all court costs and expenses, including attorneys' fees
and disbursements, incurred by Indemnitee in defense of such action (including
with respect to Indemnitee's counterclaims and crossclaims made in such
action), unless as a part of such action the court determines that each of
Indemnitee's material defenses to such action were made in bad faith or were
frivolous.

          18.  Subsequent Instruments and Acts

               The parties hereto agree that they will execute any further
instrument and perform any acts that may become necessary from time to time to
carry out the terms of this Agreement.

          19.  Limitations Period

               No legal action shall be brought and no cause of action shall be
asserted by or in the right of the Corporation or any affiliate of the
Corporation against Indemnitee, Indemnitee's spouse, heirs, executors or
personal or legal representatives after the expiration of two years from the
date of accrual of such cause of action, and any claim or cause of action of
the Corporation or its affiliates shall be extinguished and

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deemed released unless asserted by the timely filing of a legal action within
such two-year period; provided, however, that if any shorter period of
limitations is otherwise applicable to any such cause of action such shorter
period shall govern.

     IN WITNESS WHEREOF, the parties hereby have caused this Agreement to be
duly executed and signed as of the day and year first above written.

ADVANCED SWITCHING COMMUNICATIONS, INC.,
a Delaware corporation

By:

________________________________
Chief Financial Officer

INDEMNITEE:

_________________________________

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                    ADVANCED SWITCHING COMMUNICATIONS, INC.
                            STOCKHOLDERS' AGREEMENT

     THIS STOCKHOLDERS' AGREEMENT (this "Agreement") is made as of the
_____ day of August, 1998, by (i) ADVANCED SWITCHING COMMUNICATIONS, INC.
(hereinafter referred to as the "Corporation"), a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware,
and (ii) MOSTAFA INVESTMENTS LIMITED PARTNERSHIP, a Virginia limited
partnership [hereinafter sometimes referred to as "MILP"].

                            R  E  C  I  T  A  L  S:

     WHEREAS, the Corporation has authorized capital stock consisting of, among
other shares, Fourteen Million One Hundred Thousand (14,100,000) shares of
Common Stock, with a par value of one half a cent ($.005) per share;

     WHEREAS, MILP is the legal and beneficial owner of Four Million
(4,000,000) shares of Common Stock (collectively, "Shares");

     WHEREAS, the parties hereto believe that it is in the best interests of
the Corporation and of the stockholders of the Corporation to make provision
for future dispositions of its shares of stock in certain instances, including
MILP's Shares, and certain other matters;

     WHEREAS, the parties hereto desire to set forth in writing their
understandings and agreements.

     NOW, THEREFORE, in consideration of the foregoing, of the mutual promises
hereinafter set forth and of other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto, intending
to be legally bound, hereby agree as follows:

                    ARTICLE I. PURCHASE OF SHARES UPON DEATH

     1.01. TRANSFER OF SHARES. In the event of the death of Asghar Mostafa
("Mostafa"), all (but not less than all) of the Shares owned by MILP as of the
date of his death shall be sold and transferred to the Corporation as
hereinafter provided in this Article I. For purposes of this Article I, MILP is
conclusively deemed and considered to own all Shares of stock owned by it, its
administrators and personal and legal representatives.

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     1.02. Settlement. At settlement on a purchase of the Shares under this
Article I, the general partner of MLFP shall deliver to the Corporation the
Shares owned by MILP as of the date of his death, and, upon delivery of the
Shares, the Corporation shall be obligated to pay the general partner of MILP
the greater of the following two amounts: (i) the proceeds of any life insurance
policy (policies), owned by the Corporation on which (a) Mostafa is the named
insured and (b) the Corporation is the applicant, owner and beneficiary, and
which policy (policies) were purchased for the purpose of using the proceeds
thereof to purchase the Shares of MILP upon his death, rather than to reimburse
the Corporation for the loss of the services to be provided to it by Mostafa,
such policy referred to in this Article I as the "Life Insurance Policy", or
(ii) the appraised value of the Shares as determined pursuant to Article III
hereof. In the event the Life Insurance Policy proceeds are the greater of the
two amounts, then at settlement, the Corporation shall deliver to the general
partner of MILP a good check in the amount of the proceeds of the Life Insurance
Policy. In the event that the appraised value of the Shares shall be the greater
of such two (2) amounts, at settlement the Corporation shall execute and deliver
to the general partner of MILP a negotiable promissory note in substantially the
same form as the promissory note attached hereto as Exhibit A and made a part
hereof, representing the difference between the proceeds of the Life Insurance
Policy and the appraised value, constituting the unpaid portion of the purchase
price.

     1.03. Description of Policies. The Corporation hereby agrees that it will
become the applicant, owner and beneficiary of Life Insurance Policies, as
hereinafter defined, under which the insured is Mostafa. The Corporation agrees
to pay premiums on such insurance policies and on any other Life Insurance
Policies purchased by the Corporation and shall give proof of payment of
premiums to MILP whenever MILP shall request such proof. For all purposes of
this Agreement, the term "Life Insurance Policies" shall mean all life insurance
policies under which the insured is Mostafa and the Corporation is the
applicant, owner and beneficiary, which shall be in an amount and issued by an
insurer which is satisfactory to MILP; provided, however, that no such life
insurance policy shall come within the foregoing definition if the Corporation
and Mostafa shall execute a statement acknowledging that such policy is a
"key-man insurance policy" intended to reimburse the Corporation for the loss of
services which would have otherwise been provided were it not for the death of
Mostafa. If a premium on any Life Insurance Policies shall not be paid within
ten (10) days after its due date, the insured shall have the right to pay such
premium and to be promptly reimbursed therefor by the Corporation. Each policy
referred to in this Section 1.03 shall be the sole and absolute property of the
Corporation; provided, however, that the Corporation hereby (i) collaterally
assigns the policy (policies) owned by it to Mostafa who is the named insured as
security only for the performance by the Corporation of the obligations on its
part to be performed under this Article I and (ii) agrees to complete, execute,
have acknowledged and deliver to the issuing life insurance company any form
required by such insurance company in order to effect such collateral
assignment. The parties hereto agree to determine, from time to time, in good
faith, the fair market value of the Shares. In the event that the fair market
value of the Shares exceeds the face amount of the Life Insurance Policies on
the life of Mostafa, the Corporation shall consider the purchase of additional
Life Insurance Policies so that the total

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face amount of all of the Life Insurance Policies on the life of Mostafa is
equal to or exceeds the fair market value of the Shares owned by MILP. In the
event that the Corporation purchases additional insurance on the life of
Mostafa, Mostafa hereby agrees to cooperate fully by performing all the
requirements of the insurer which are necessary conditions precedent to the
issuance of such life insurance policies.

     1.04. PURCHASE OF POLICIES. In the event that MILP shall transfer all of
its Shares other than pursuant to Article I hereof or, in the event that this
Agreement shall terminate, then, in either event, Mostafa shall have the right
to purchase from the Corporation any Life Insurance Policies on which he is the
named insured, by paying to the Corporation an amount equal to the cash value
of such policy (policies), if any, the unearned premiums on such policy
(policies) or One Dollar ($1.00), whichever is greatest.

                     ARTICLE II.  PUT AND CALL RIGHTS UPON
                      PERMANENT DISABILITY OR TERMINATION

     2.01. PURCHASE OF SHARES UPON PERMANENT DISABILITY OR TERMINATION.  In the
event of the permanent disability or termination of employment of Mostafa for
any reason whatsoever, for a period of one hundred eighty (180) calendar days
after the date of such permanent disability or termination, as the case may
be, MILP shall have the right to cause Company to repurchase all but not less
than all of the Shares then owned by MILP, and (ii) Company shall have the
right to repurchase all but not less than all of the Shares then owned by MILP,
such purchase to be completed within thirty (30) days from the date of
exercise, for a purchase price equal to the value of the Shares, determined as
of the last day of the month preceding the date on which either MILP or
Corporation exercises its rights under this Section 2.01. The purchase shall be
shall be in cash or, if the Corporation and MILP agree, the Corporation may pay
the value with its promissory note in substantially the same form as Exhibit A,
except bearing interest at the annual the prime rate (as set forth at the main
depository bank of the Corporation) plus 1% and amortized over a term of ten
(10) years.

     2.02. EXERCISE OF RIGHTS TO CALL. To exercise its rights hereunder, the
Corporation shall give MILP a written notice of its intent to exercise its
rights ("Call Notice"), which notice shall constitute an unconditional and
irrevocable offer to repurchase the Shares, and which shall contain the
Corporation's determination of the value of the Shares. If MILP does not agree
with the valuation, it shall notify the Corporation that it contests the value
stated in Call Notice within twenty (20) days after the Corporation has given
such Call Notice, and the Shares shall thereupon be appraised as set forth in
Article III below. If MILP fails to notify the Corporation that it contests the
value, such value shall be final, and on or before forty (40) days from the
date on which the Corporation has given such Call Notice, (i) the Corporation
shall pay the value of the Shares to MILP in cash or, if the Corporation and
MILP agree, the Corporation may pay the value with its promissory note in
substantially the same form as Exhibit A, except bearing interest at the annual
the prime rate (as set forth at the main

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depository bank of the Corporation) plus 1% and amortized over a term of ten
(10) years, and (ii) MILP shall give to the Corporation the certificate(s)
representing the Shares, properly endorsed for transfer.

     2.03. EXERCISE OF RIGHTS TO PUT. To exercise its rights hereunder, MILP
shall give the Corporation a written notice of its intent to exercise its
rights hereunder ("Put Notice") to that effect, which notice shall constitute
an unconditional and irrevocable offer to sell the Shares to the Corporation.
Within sixty (60) days after receiving the Put Notice, the Corporation shall
notify MILP in writing of its determination of the value of the Shares. If MILP
does not agree with the valuation, it shall notify the Corporation that it
contests the value stated in response to the Put Notice within twenty (20) days
after the Corporation has given such response, and the Shares shall thereupon
be appraised as set forth in Article III below. If MILP does not notify the
Corporation that it contests the value as determined by the Corporation, then
within twenty (20) days after receiving such response, such value shall be
final, and on or before forty (40) days from the date on which the Corporation
has sent MILP the notice of determination of value, (i) the Corporation shall
pay the value of the Shares to MILP, in cash or, if the Corporation and MILP
agree, the Corporation may pay the value with its promissory note in
substantially the same form as Exhibit A, except bearing interest at the annual
the prime rate plus 1% (as set forth at the main depository bank of the
Corporation) and amortized over a term of ten (10) years, and (ii) MILP shall
upon receipt of such payment give to the Corporation the certificate(s)
representing the Shares, properly endorsed for transfer.

            ARTICLE III.   VALUATION OF THE SHARES

     3.01.  DETERMINATION OF VALUE. Value, for purposes of this Agreement,
shall be determined initially by the Corporation's Board of Directors, who may
but shall not be obligated to seek or rely upon the opinions of financial or
investment advisors. If MILP notifies the Corporation within the time limits
set forth above in Sections 2.02 or 2.03, as the case may be, that it contests
such determination, the Corporation shall appoint an appraiser ("Appraiser"),
acceptable to MILP, who shall determine the value and whose determination shall
be final and binding. The Appraiser (i) shall have the requisite experience and
knowledge to evaluate the Corporation and determine its value and (ii) shall
have no prior professional relationship with either party. The Appraiser shall
determine the value of the Shares, using such procedures as he deems necessary.
The Corporation and MILP shall provide the Appraiser with full access to
financial and other data, all of which the Appraiser shall hold in confidence
to the extent reasonably requested by the Corporation. The Corporation shall
pay the entire cost of the appraisal.

     3.02.  EXERCISE OF RIGHTS TO PUT. The value of the Shares for all purposes
under this Agreement, regardless of who determines it, shall be determined on
the basis at which the entire the Corporation would change hands between a
willing buyer and a willing seller, each having knowledge of all relevant facts
and neither being under any compulsion to buy or sell,

                                       4
<PAGE>   5
with a premium attributed to the fact that the Shares represent a control
position in a closely-held company.

     3.03.  Right of Revaluation.  Notwithstanding anything set forth herein,
in the event the Corporation shall purchase the Shares following the Call
Notice under Section 2.02 above, then MILP shall have the right for the
Revaluation Period, as defined below, to again request the Corporation
determine the value. Upon receipt of such notice, the Corporation's Board of
Directors shall determine value, who may but shall not be obligated to seek or
rely upon the opinions of financial or investment advisors. Value shall be as
of the date of the receipt of the request and thereafter the Corporation shall
pay MILP the difference, if any, between the value determined in connection
with the Call Notice and the value determined under this Section 3.03. The
Revaluation Period shall commence with the date of disability or termination,
and shall extend for the same number of months as Mostafa was employed by the
Corporation, but for a minimum of eighteen (18) months. The value determined
under this Section shall be final, and the Corporation shall pay the difference
in the value to MILP in the form of a four (4) equal quarterly payments,
without interest, or upon such other terms as may be agreed upon between the
Corporation the MILP, and MILP shall have no further rights under this
Agreement. Notwithstanding the foregoing, MILP shall have no right to a
revaluation hereunder if Mostafa shall be been terminated, following his
termination "for cause" as defined in that certain Executive Employment
Agreement dated of even date herewith between the Corporation and Mostafa,
("Executive Employment Agreement").

     3.04.  Definition of Permanent Disability.  For purposes of this
Agreement, the term "permanent disability" shall have the same meaning as in
the Executive Employment Agreement.

                        ARTICLE IV. GENERAL PROVISIONS

     4.01.  Transfer Legend Notice.  The certificate representing the Shares
will bear a legend indicating (i) that the Shares have not been registered
under the Securities Act of 1933 or the securities laws of any jurisdiction,
and may not be sold or offered for sale in the absence of such registration or
an exemption therefrom, and (ii) that any Transfer of the Shares is subject to
this Agreement, and will not be recognized by Company unless made in compliance
with this Agreement.

                                       5
<PAGE>   6
     4.02.     Notices.  Any and all notices, requests or other communications
provided for herein shall be given in writing and sent by hand delivery or by
registered or certified mail, return receipt requested, with first-class
postage prepaid; and such notices shall be addressed: (i) if to the
Corporation, to the principal office of the Corporation; and (ii) if to MILP,
to the address of MILP as reflected in the records of the Corporation, unless
notice of a change of address is furnished to all parties in the manner provided
in this Section 4.02. Any notice which is required to be made within a stated
period of time shall be considered timely if delivered or mailed before
midnight of the last day of such period.

     4.03.     Invalid or Unenforceable Provisions.    The invalidity or
unenforceability of any particular provision of this Agreement shall not
affect the other provisions whereof, and this Agreement shall be construed in
all respects as if such invalid or unenforceable provision were omitted.

     4.04.     Delivery of Shares and Documents.  Upon the closing of any
purchase of any Shares pursuant to this Agreement, the seller shall deliver to
the purchaser the following: The certificate or certificates representing the
Shares being sold, duly endorsed for transfer and bearing such documentary
stamps, if any, as are necessary, and such assignments, certificates of
authority, tax releases, consents to transfer, instruments and evidences of
title of the seller and of its compliance with this Agreement as may be
reasonably required by the purchaser (or by counsel for the purchaser).

     4.05.      Changes: Waiver.    No change or modification of this Agreement
shall be valid unless the same is in writing and signed by both the parties
hereto. The failure of any party at any time to insist upon strict performance
of any condition, promise, agreement or understanding set forth herein shall not
be construed as a waiver or relinquishment of the right to insist upon strict
performance of the same or any other condition, promise, agreement or
understanding at a future time.

     4.06.      Entire Agreement.   This Agreement sets forth all of the
promises, agreements, conditions, understandings, warranties and representations
among the parties hereto with respect to the Shares owned by MILP and any other
matters set forth herein, and there are no promises, agreements, conditions,
understandings, warranties or representations, oral or written, express or
implied, among them with respect to such shares or such other matters except as
set forth herein. This Agreement is, and is intended by the parties to be, an
integration of any and all prior agreements or understandings, oral or written,
with respect to the Shares.

     4.07.     Governing Law. This Agreement shall be construed and enforced in
accordance with the laws of the Commonwealth of Virginia.

     4.08.     Headings. The headings, subheadings and other captions in this
Agreement are for convenience and reference only and shall not be used in
interpreting, construing or

                                       6
<PAGE>   7

enforcing any of the provisions of this Agreement.

     4.09.  Term of Agreement.  This Agreement shall be effective as of the
date first hereinabove set forth and shall terminate at such time as MILP shall
sell all of its Shares in the Corporation.

     4.09   Benefit and Burden.  This Agreement shall inure to the benefit of,
and shall be binding upon, the parties hereto and their legatees, distributees,
estates, executors, administrators, personal representatives, successors and
assigns, and other legal representatives.

     4.10   Days Defined.  Whenever any notice or action needs to be taken
under this Agreement within a specified number of days, such reference shall
measured in calendar days.

     IN WITNESS WHEREOF, the Corporation has caused this Agreement to be
executed by its duly authorized officers and its corporate seal to be affixed
hereto, and MILP has executed this Agreement by its general partner, all as of
the day and year first above written.

ATTEST:                                         CORPORATION:

                                                ADVANCED SWITCHING
COMMUNICATIONS,                                  INC., a Delaware corporation

/s/ Ronald S. Westernik                         By /s/ Ronald S. Westernik
-------------------------------                 -------------------------------
Ronald S. Westernik                             Ronald S. Westernik, COO
Secretary
[Corporate Seal]

WITNESS:                                        MOSTAFA INVESTMENTS LIMITED
                                                 PARTNERSHIP, a Virginia limited
                                                 partnership

/s/ Jhoti Ranade                                by /s/ Asghar D. Mostafa  [SEAL]
-------------------------------                 --------------------------------
                                                Asghar D. Mostafa, General
                                                 Partner

                                       7

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