EXHIBIT 10.12


                          HOLD BILLING SERVICES, LTD.
                    SUPPLEMENTAL ADVANCE PURCHASE AGREEMENT


This Supplemental Advance Purchase Agreement ("Supplemental Agreement") is
entered into as of the ___day of ________________________ 199____ (the
"Effective Date"), between HOLD Billing Services, Ltd. ("HBS"), a Texas limited
partnership with its principal office at 4242 Medical Drive, Suite 2100, San
Antonio, TX 78229 (hereinafter "HBS"), and ___________________
__________________________________ ("CUSTOMER"), a _______________ corporation
with its principal office at.


                                  WITNESSETH:


WHEREAS, CUSTOMER and HBS have previously entered into a Billing Services
Agreement dated________ ("Billing Services Agreement"); and

WHEREAS, CUSTOMER wishes to sell its interest in LEC Accounts (as hereinafter
defined) to HBS to accelerate payment;

NOW, THEREFORE, CUSTOMER and HBS hereby consent to the terms of this
Supplemental Agreement and acknowledge that it is an integral part of their
Billing Services Agreement. The parties acknowledge that the terms of the
Supplemental Agreement will control if there are inconsistencies between the two
documents.

                                   Section 1
                               CERTAIN DEFINITIONS

The following definitions apply to the corresponding terms used in this
Supplemental Agreement:

                  1.  "End-User Accounts" means accounts receivable generated
                  when CUSTOMER provides telecommunications services to End-
                  Users.

                  2.  "LEC Accounts" means CUSTOMER's receivables from Billing
                  Entities generated by the sale of CUSTOMER's End-User Accounts
                  to a Billing Entity through HBS.

                  3.  "Affiliate" or "Affiliates" of a party to this Agreement
                  means any direct parent or subsidiary, or any other entity
                  under common control with the applicable party.

                  4.  "Billing Entity" means any regional Bell operating
                  company, independent local exchange carrier or other provider
                  of local telephone services through which HBS has billing and
                  collection agreements.

                  5.  "Business Day" means Monday through Friday excluding
                  nationally recognized holidays observed by the Billing
                  Entities.


                  6.  "End-User" means a customer of CUSTOMER who has used
                  telecommunication services of CUSTOMER.

                  7.  "Call Detail Record" means the documentation of an
                  individual telecommunications transaction between CUSTOMER and
                  an End-User evidencing an End-User Account.

                  8.  "Shipment" means a batch of Call Detail Records submitted
                  to HBS for billing and collection.

                  9.  "Amount Accepted" means the value of Call Detail Records
                  accepted by HBS for billing and collection.

                  10. "Initial Payment" means the down payment that HBS will pay
                  CUSTOMER for the Amount Accepted.

                  11. "Final Payment" means amounts that are payable by HBS to
                  CUSTOMER under terms of the Billing Services Agreement net of
                  Initial Payments repayable on Amounts Accepted that are
                  related thereto and net of any invoices outstanding.

                  12. "Advance Payable Schedule" means a schedule detailing the
                  amount of the funds that HBS will transfer to CUSTOMER.

                  13. "Factoring Fee" is the amount the CUSTOMER is charged for
                  Initial Payments. Such fees are invoiced to CUSTOMER
                  periodically.

                  14. "Chargebacks" mean Call Detail Records which are returned
                  as either uncollectible or unbillable, or are adjusted by
                  either the Billing Entity or by HBS.

                  15. "Maximum Advance Percentage" means the maximum percentage
                  of the Amount Accepted that is eligible for an Initial
                  Payment.

                  16. "Initial Payment Lag Time" means the number of Business
                  Days between the day on which the End-User Accounts are
                  processed by HBS and the day on which the Initial Payment is
                  made.

                  17. "Maximum Amount of Initial Payments" means the cumulative
                  outstanding Initial Payments set forth on Exhibit "A" attached
                  hereto.

                  18. "Collateral" shall have the meaning ascribed thereto in
                  Section 6 hereof.

                  19. "Agreements" means the Billing Services Agreement and this
                  Supplemental Agreement, collectively.


                  20. "Prime Rate" means the prime rate of NationsBank.


                                   Section 2
                                   AGREEMENT

CUSTOMER'S End-User Accounts are purchased by a Billing Entity at the time they
are accepted for billing and collection by the Billing Entity. Such purchase
gives rise to LEC Accounts owing to CUSTOMER. The proceeds of CUSTOMER's LEC
Accounts are typically collected 45 to 60 days after Billing Entity acceptance
of the End-User Accounts sold to the Billing Entity which give rise to such LEC
Accounts. During the term of this Agreement, HBS will purchase CUSTOMER's LEC
Accounts to accelerate CUSTOMER's cash flow. Title to CUSTOMER's LEC Accounts
shall pass to HBS upon payment of the Initial Payment for such LEC Accounts.
While such sale will be without recourse, CUSTOMER shall be liable to repurchase
LEC Accounts which are subsequently subject to Chargebacks and LEC Accounts
which remain unpaid by the applicable LEC for more than ninety (90) days after
the End-User Accounts related thereto were submitted to the LEC. CUSTOMER shall
also be liable to HBS in cases of breached representations and warranties in the
Agreements, including without limitation, representations and warranties
pertaining to the LEC Accounts and the other Collateral.

Section 3
PURCHASE PROCEDURES

The parties hereby agree that HBS' purchase of CUSTOMER's LEC Accounts shall
take place in accordance with the following provisions:

                  1.  At least weekly, the following events will occur:

                                    a. HBS will determine which Amounts
                           Accepted, if any, are eligible for Initial Payments
                           by reference to the parameters specified in Exhibit A
                           hereof.

                                    b. HBS will calculate the amount of the
                           Initial Payment due by multiplying the eligible
                           Amounts Accepted by the Maximum Advance Percentage
                           specified in Exhibit A. The Maximum Advance
                           Percentage will be reevaluated periodically and may
                           be changed if HBS, at its sole discretion, determines
                           that it is at risk because of unexpectedly high
                           levels of Chargebacks or End-User complaints.

                                    c. HBS will provide an Advance Payable
                           Schedule to CUSTOMER in a format that clearly sets
                           forth the calculation of the Initial Payment. The
                           calculated Initial Payment, when added to the
                           cumulative Initial Payments outstanding, may not
                           exceed the Maximum Amount of Initial Payments.
                           Cumulative Initial Payments outstanding is calculated
                           as


                           cumulative Initial Payments advanced minus cumulative
                           Initial Payments repaid.

                                    2.  Subject to the Maximum Amount of Initial
                           Payments, the Maximum Advance Percentage, and all
                           other conditions set forth herein, HBS will transfer
                           funds to the CUSTOMER'S bank account that is
                           specified in the Billing Services Agreement. The
                           transfer of funds will include the Initial Payment as
                           determined from the Amount Accepted during the
                           payment period as well as any Final Payments due to
                           Customer

                                    3.  If HBS has reason to suspect that a
                           Billing Entity may experience Chargebacks or other
                           pass through charges of a magnitude that might impair
                           HBS's ability to recoup its Initial Payments and
                           Factoring Fees, HBS shall have the right, at its sole
                           discretion, to suspend Initial Payments until it is
                           assured of collecting all monies due it hereunder.

                                    4.  The Factoring Fee will be calculated
                           monthly and invoiced to Customer. The daily fee is
                           calculated by multiplying the Factoring Fee Rate set
                           forth on Exhibit A by 1/365 and then by each day's
                           outstanding Initial Payments. The monthly fee is
                           calculated by summing all daily fees not previously
                           paid to HBS.

                                    5.  HBS has the right to set-off sums owed
                           by CUSTOMER against sums HBS owes to CUSTOMER and
                           sums HBS receives on CUSTOMER's behalf from Billing
                           Entities.


                           Section 4
                           PROCESSING OF ACCOUNTS

                           CUSTOMER will be responsible for all operational
                           matters regarding the End-User Accounts including,
                           but not limited to, customer inquiries, customer
                           adjustments, interaction with regulators, and all tax
                           matters. HBS's sole function under this Supplemental
                           Agreement shall be to purchase CUSTOMER's LEC
                           Accounts and any related obligations specifically
                           enumerated herein.


                           Section 5
                           GENERAL REPRESENTATIONS, WARRANTIES AND COVENANTS

                           In connection with the factoring of LEC Accounts
                           hereunder, CUSTOMER and HBS represent, warrant and
                           covenant to and with one another, as of the date
                           hereof and as of the date of each subsequent
                           Shipment, as follows:

                                    1.  Both parties will promptly and
                           efficiently discharge their obligations under this
                           Supplemental Agreement.


                                    2.  Both parties have the financial
                           capability to perform their obligations hereunder and
                           shall maintain such ability at all times during the
                           term of this Supplemental Agreement.

                                    3.  Neither HBS nor CUSTOMER has entered
                           into any agreement or commitments which would
                           prohibit either party from performing their
                           obligations imposed hereunder or prevent either party
                           from enjoying the rights granted hereunder.

                                    4.  HBS will have the right of access to
                           CUSTOMER's facilities if necessary to facilitate
                           liquidation of the Collateral and collection of the
                           LEC Accounts and the End-User Accounts and, at
                           reasonable times, to audit and copy CUSTOMER's books
                           and records with respect to the Collateral. A
                           representative of HBS's lender may accompany HBS
                           during such inspections.

                                    5.  CUSTOMER represents that all information
                           about CUSTOMER's financial condition provided to HBS
                           was accurate when submitted, as will be any
                           information subsequently provided.

                                    6.  CUSTOMER represents to HBS that its
                           chief executive office is the location set forth on
                           page 1 hereof and that none of its books and records
                           with respect to the Collateral shall be moved without
                           at least 20 days prior written notice to HBS.


                           Section 6
                           COLLATERAL

                                    1.  As collateral security for any and all
                           of CUSTOMER's obligations and liabilities to HBS
                           under the Agreements, CUSTOMER hereby grants to HBS a
                           continuing first lien and security interest in all of
                           the following property of CUSTOMER, whether now owned
                           or hereafter acquired or arising (collectively
                           "Collateral"):

                                             a. LEC Accounts and general
                                    intangibles due or to become due from any
                                    Billing Entity which HBS has purchased or
                                    hereafter purchases from CUSTOMER;

                                             b. All accounts, general
                                    intangibles and other amounts due or to
                                    become due from HBS to CUSTOMER in
                                    connection with the LEC Accounts described
                                    above;

                                             c. All End-User accounts, due or to
                                    become due, which heretofore have and may
                                    now or hereafter give rise to a LEC Account


                                    purchased by HBS, whether as a result of a
                                    sale, pledge or granting of a lien in an End
                                    User Account to a Billing Entity;

                                             d. All reserves and other amounts
                                    due or to become due from HBS to CUSTOMER
                                    under the terms of any agreement, document
                                    or instrument between CUSTOMER and HBS;

                                             e. All general intangibles relating
                                    to any of the foregoing, including without
                                    limitation all books and records and
                                    customer lists relating to the customers
                                    obligated on the foregoing LEC Accounts and
                                    End-User Accounts; and

                                             f. All cash and noncash proceeds of
                                    any of the foregoing.

                                    2.  LEC Accounts are presently paid by the
                           applicable Billing Entity directly to HBS. HBS has
                           authorized its lender to collect directly from the
                           Billing Entity as its assignee.

                                    3.  HBS consents to CUSTOMER's sale of End-
                           User Accounts to the Billing Entities. Such consent
                           is conditioned upon the sale being subject to HBS'
                           lien and security interest continuing in the End-User
                           Accounts. Such continuing lien will be subordinate
                           and subject in all respects to the rights of the
                           Billing Entities in such End-User Accounts.

                                    4.  While it is intended that the sale of
                           LEC Accounts to HBS constitute a true sale of such
                           LEC Accounts, in the event that any such sale is
                           found to be a financing transaction or a loan, it is
                           the intention of the parties that such financing or
                           loan be secured by a perfected security interest in
                           the LEC Accounts as well as the other Collateral.

                                    5.  With respect to the Collateral, CUSTOMER
                           represents and warrants to HBS as follows:

                                             a. Except for financing statements
                                    in favor of HBS, no financing statement
                                    covering the Collateral is filed in any
                                    public office;

                                             b. None of the Collateral is
                                    affixed to real estate, is an accession to
                                    any goods, is commingled with other goods,
                                    or will become a fixture, accession, or part
                                    of a product or mass with other goods; and

                                             c. No End-User or Billing Entity or
                                    other obligors whose debts or obligations
                                    are part of the Collateral have any right to
                                    setoffs, counterclaims, or adjustment or any
                                    defenses in connection with their debts or
                                    obligations; and


                                             d. CUSTOMER owns all of its End-
                                    User Accounts, LEC Accounts and other
                                    Collateral free and clear of all liens,
                                    claims and encumbrances of any nature.

                                    6.  With respect to the Collateral, CUSTOMER
                           covenants with HBS as follows:

                                             a. CUSTOMER will defend the
                                    Collateral against all claims and demands
                                    adverse to HBS' interest in such property
                                    and will keep the Collateral free from all
                                    liens, claims and other encumbrances except
                                    those for taxes not yet due and the security
                                    interests created hereunder. The Collateral
                                    will remain in CUSTOMER's possession or
                                    control at all times, except as otherwise
                                    provided in this Supplemental Agreement.
                                    CUSTOMER will maintain the Collateral in
                                    good condition and protect it against
                                    misuse, abuse, waste, and deterioration;

                                             b. CUSTOMER will pay all expenses
                                    incurred by HBS in obtaining, preserving,
                                    perfecting, defending, and enforcing the
                                    security interests granted herein and in
                                    preserving and protecting the Collateral and
                                    in collecting or enforcing the obligations
                                    of CUSTOMER to HBS under the Agreements.
                                    Expenses for which CUSTOMER is liable
                                    include, but are not limited to, taxes,
                                    assessments, reasonable attorneys' fees and
                                    other legal expenses. These expenses will
                                    bear interest from the date of demand by HBS
                                    for their payment to the date of payment at
                                    the rate of Prime plus 4% per annum, and
                                    CUSTOMER will pay HBS this interest on
                                    demand at a time and place reasonably
                                    specified by HBS. These expenses and
                                    interest will be part of the obligations
                                    secured hereby and will be recoverable as
                                    such in all respects;

                                             c. CUSTOMER will immediately notify
                                    HBS of: (i) any material change in the
                                    Collateral; (ii) change in CUSTOMER's name,
                                    address, or location; (iii) change in any
                                    matter warranted or represented in this
                                    Supplemental Agreement; (iv) change that may
                                    affect the security interest granted herein;
                                    and (v) any Event of Default;

                                             d. CUSTOMER will not sell,
                                    transfer, or encumber any of the Collateral
                                    (except sales of End-User Accounts to
                                    Billing Entities) without the prior written
                                    consent of HBS;

                                             e. At the time and in the form
                                    specified by HBS, CUSTOMER will furnish HBS
                                    any requested information related to the
                                    Collateral, which may include all
                                    information necessary to identify any of the
                                    Collateral;


                                             f. CUSTOMER will preserve the
                                    liability of all obligors on the Collateral
                                    and preserve HBS's first priority lien
                                    position in all Collateral;

                                             g. Without the written consent of
                                    HBS, CUSTOMER will not agree to any
                                    modification of terms in any writing related
                                    to the Collateral;

                                             h. Upon written notice of default
                                    to CUSTOMER regarding any obligation under
                                    this Supplemental Agreement, HBS may demand
                                    that CUSTOMER will immediately deposit all
                                    payments received as proceeds of Collateral
                                    in a special bank account designated by HBS,
                                    who alone will have power of withdrawal.
                                    CUSTOMER will deposit the payments on
                                    receipt, in the form received, and with any
                                    necessary endorsements. HBS may make any
                                    endorsements in CUSTOMER's name and behalf.
                                    Between receiving and depositing these
                                    payments, CUSTOMER will not commingle them
                                    with any of CUSTOMER's other funds or
                                    property but will hold them separate and in
                                    an express trust for HBS. HBS shall apply
                                    all or part of these funds against
                                    CUSTOMER's obligations;

                                             i. Unless notified otherwise in
                                    writing by HBS, CUSTOMER will:

                                                   (i) inform HBS immediately of
                                    the rejection of goods, delay in delivery or
                                    performance, or claim made in regard to any
                                    Collateral; and

                                                   (ii) pay HBS the unpaid
                                    amount of any LEC Account under any of these
                                    conditions: if the LEC Account is
                                    Chargedback or not paid within 90 days of
                                    submission of the associated End-User
                                    Accounts to the applicable Billing Entity;
                                    if the Billing Entity rejects the goods or
                                    services covered by the LEC Account; or if
                                    HBS rejects the LEC Account as
                                    unsatisfactory. HBS may retain the LEC
                                    Account in Collateral and may charge any
                                    deposit account of CUSTOMER, or set-off
                                    against any amount payable by HBS to
                                    CUSTOMER, with the unpaid amount;

                                             j. CUSTOMER will maintain accurate
                                    books and records covering the Collateral
                                    and showing the assignment of accounts in
                                    Collateral to HBS. Only undisputed and
                                    unpaid amounts will be shown as owed to
                                    CUSTOMER on the books;

                                             k. Each LEC Account and End-User
                                    Account will represent the valid, legally
                                    enforceable obligation of third parties and
                                    will not be evidenced by any instrument or
                                    chattel paper; and


                                             l. If any Collateral or proceeds
                                    include obligations of third parties to
                                    CUSTOMER, the transactions creating those
                                    obligations will conform in all respects to
                                    applicable state and federal law.

                                    7.  Each of the following conditions is an
                           "Event of Default":

                                             a. If CUSTOMER defaults in timely
                                    payment or performance of any obligation,
                                    covenant, or liability in any written
                                    agreement between CUSTOMER and HBS or in any
                                    other transaction described in any of the
                                    Agreements;

                                             b. If any warranty, covenant, or
                                    representation made to HBS by or on behalf
                                    of CUSTOMER proves to have been false in any
                                    material respect when made;

                                             c. If a receiver is appointed for
                                    CUSTOMER or any of the Collateral;

                                             d. If the Collateral is assigned
                                    for the benefit of creditors or, to the
                                    extent permitted by law, if bankruptcy or
                                    insolvency proceedings are commenced against
                                    or by any of the following parties:
                                    CUSTOMER; any partnership of which CUSTOMER
                                    is a general partner; and any maker, drawer,
                                    acceptor, endorser, guarantor, surety,
                                    accommodation party, or other person liable
                                    on or for any part of the obligations and
                                    liabilities of CUSTOMER to HBS;

                                             e. If any financing statement
                                    regarding the Collateral and not favoring
                                    HBS is filed;

                                             f. If any lien attaches to any of
                                    the Collateral; and

                                             g. If any of the Collateral is
                                    lost, stolen, damaged, or destroyed, unless
                                    it is promptly replaced with Collateral of
                                    like quality or restored to its former
                                    condition.

                                    8.  In addition to all other rights and
                           remedies available to HBS at law or in equity or
                           under the terms of any of the Agreements, HBS may
                           exercise the following rights and remedies after the
                           occurrence of an Event of Default (as defined below):

                                    a. Notify account debtors to make all
                           payments on Collateral directly to HBS (it being
                           understood that Billing Entities shall always make
                           payments to HBS directly regardless of the occurrence
                           of an Event of Default);


                                    b. Take control of any funds generated by
                           the Collateral, such as refunds from any proceeds of
                           insurance, and reduce any part of the obligations
                           secured hereby in such order as HBS shall determine
                           or, in HBS's sole discretion, permit CUSTOMER to use
                           such funds to repair or replace damaged or destroyed
                           Collateral covered by insurance;

                                    c. Demand, collect, convert, redeem, settle,
                           compromise, receipt for, realize on, adjust, sue for,
                           and foreclose on the Collateral, either in HBS's or
                           CUSTOMER's name, as HBS desires;

                                    d. Declare all obligations and liabilities
                           of CUSTOMER hereunder immediately due and payable and
                           enforce such obligations;

                                    e. Require CUSTOMER to deliver to HBS all
                           books and records relating to the Collateral;

                                    f. Require CUSTOMER to assemble the
                           Collateral and make it available to HBS at a place
                           reasonably convenient to both parties;

                                    g. Take possession of any of the Collateral
                           and for this purpose enter any premises where it is
                           located if this can be done without breach of the
                           peace;

                                    h. Sell, lease, or otherwise dispose of any
                           of the Collateral in accordance with the rights,
                           remedies, and duties of a secured party under
                           chapters 2 and 9 of the Texas Uniform Commercial Code
                           after giving notice as required by those chapters;
                           unless the Collateral threatens to decline speedily
                           in value, is perishable, or would typically be sold
                           on a recognized market, HBS will give CUSTOMER
                           reasonable notice of any public sale of the
                           Collateral or of a time after which it may be
                           otherwise disposed of without further notice to
                           CUSTOMER; in this event, notice will be deemed
                           reasonable if it is mailed, postage prepaid, to
                           CUSTOMER at the address specified in this
                           Supplemental Agreement at least ten (10) days before
                           any public sale or ten (10) days before the time when
                           the Collateral may be otherwise disposed of without
                           further notice to CUSTOMER;

                                    i. Apply any proceeds from disposition of
                           the Collateral after default in the manner specified
                           in chapter 9 of the Texas Uniform Commercial Code,
                           including payment of HBS's reasonable attorneys' fees
                           and court expenses; and

                                    j. If disposition of the Collateral leaves
                           the obligations and liabilities of CUSTOMER under the
                           Agreements unsatisfied, collect the deficiency from
                           CUSTOMER.


                                    9.  A carbon, photographic, or other
                           reproduction of this Supplemental Agreement or any
                           financing statement covering the Collateral is
                           sufficient as a financing statement.

                                    10. If the Collateral is sold after default,
                           recitals in the bill of sale or transfer will be
                           prima facie evidence of their truth, and all
                           prerequisites to the sale specified by this
                           Supplemental Agreement and by the Texas Uniform
                           Commercial Code will be presumed satisfied.

                                    11. This security interest shall neither
                           affect nor be affected by any other security for any
                           of the obligations and liabilities of CUSTOMER to
                           HBS. Neither extensions of any of the obligations nor
                           releases of any of the Collateral will affect the
                           priority or validity of the security interests
                           granted herein with reference to any third person.

                                    12. Foreclosure of the security interests
                           granted herein by suit does not limit HBS's remedies,
                           including the right to sell the Collateral under the
                           terms of this Supplemental Agreement. All remedies of
                           HBS may be exercised at the same or different time,
                           and no remedy shall be a defense to any other. HBS's
                           rights and remedies include all those granted by law
                           or otherwise, in addition to those specified in this
                           Supplemental Agreement.


                           Section 7
                           TERM AND TERMINATION

                           The term of this Supplemental Agreement shall
                           commence on the Effective Date and will run
                           concurrent with the Billing Services Agreement which
                           this contract supplements. This Supplemental
                           Agreement may be terminated in accordance with the
                           following provisions upon the occurrence of any of
                           the following events:

                                    1.  In the event that either party
                           materially or repeatedly defaults in the performance
                           of any of its duties or obligations set forth herein
                           and such default is not substantially cured within
                           thirty (30) days after written notice is given to the
                           defaulting party specifying the default, then the
                           party not in default may, by giving written notice
                           thereof to the defaulting party, terminate this
                           Supplemental Agreement as of a date specified in such
                           notice of termination;

                                    2.  Failure to reimburse HBS for a
                           deficiency in a Final Payment or to pay Factoring
                           Fee(s) when due;

                                    3.  Termination of the underlying Billing
                           Services Agreement; or


                                    4.  Upon the occurrence of an Event of
                           Default.

                           Termination of this Supplemental Agreement shall not
                           relieve either party of any obligations which have
                           accrued prior to the date of such termination,
                           including without limitation, the respective
                           obligations of the parties to make payments
                           hereunder.


                           Section 8
                           DOLLAR AMOUNT OF COMMITMENT

                           HBS agrees to purchase CUSTOMER's LEC Accounts up to
                           the Maximum Amount of Initial Payments at any one
                           time outstanding. At HBS' sole discretion, the
                           cumulative dollar amount of Initial Payments may be
                           increased or decreased from time to time, but in no
                           event will HBS be obligated to make Initial Payments
                           in excess of the Maximum Amount of Initial Payments
                           unless this Section is amended in writing.


                           Section 9
                           DOCUMENTS REQUIRED

                           CUSTOMER agrees to furnish the following documents to
                           HBS as conditions of funding:

                                    1.  Financial Statements within 90 days of
                           the end of CUSTOMER'S fiscal year and within 45 days
                           of the end of each of the CUSTOMER'S first three
                           fiscal quarters. Such statements will be prepared in
                           accordance with generally accepted accounting
                           principles and will be certified by the CUSTOMER's
                           chief financial officer or its independent Certified
                           Public Accountants;

                                    2.  Revenue projections within 30 days of
                           the close of the CUSTOMER's fiscal year;

                                    3.  Copy of Federal Form 941 and proof of
                           payment of tax deposits within 30 days after the
                           close of each calendar quarter;

                                    4.  UCC-1 Financing Statements in form,
                           number and substance acceptable to HBS; and

                                    5.  UCC-1 financing statement, judgment and
                           state and federal tax lien searches verifying that
                           HBS will possess a first priority perfected lien
                           position with respect to the Collateral.

                           If HBS has reason to question the accuracy of the
                           above documents or the collectibility of the LEC
                           Accounts, HBS will have the right to audit (and


                           HBS' lendor shall have the right to accompany HBS on
                           such audits) the documents, LEC Accounts, and/or the
                           systems by which LEC Accounts and End-User Accounts
                           are generated. The cost of such audit will be borne
                           50% by each of the parties to this Supplemental
                           Agreement.

                           CUSTOMER shall, from time to time, furnish to HBS all
                           documents, instruments and agreements reasonably
                           requested by HBS to facilitate the terms hereof
                           including without limitation, additional UCC-1
                           financing, continuation and amendment statements.


                           Section 10
                           LIMITATION OF LIABILITY

                           The parties agree that in the event of any failure,
                           defect in the services provided hereunder by HBS, or
                           in the event of any negligence on the part of HBS or
                           otherwise in performing this Supplemental Agreement
                           that neither HBS, nor its general partner, nor any
                           employee or agent thereof shall be liable to CUSTOMER
                           for injury or loss to CUSTOMER or CUSTOMER's business
                           or property arising out of or occasioned by, directly
                           or indirectly, such failure, defect or negligence,
                           and CUSTOMER agrees to save HBS harmless from all
                           claims for any such damages, except as follows in
                           this Section 10.

                           The amount of damages recoverable against HBS for any
                           and all acts or omissions related to this
                           Supplemental Agreement shall not exceed the amount of
                           Factoring Fees collected by HBS for the six-month
                           period immediately preceding the first occurrence of
                           such event, act or omission. In no event will the
                           measure of damage recoverable by CUSTOMER against HBS
                           include any amounts for indirect, consequential or
                           punitive damages or for the loss of anticipated
                           profits or other alleged economic loss. CUSTOMER may
                           not assert a cause of action that occurred more than
                           two (2) years prior to filing of suit.


                           Section 11
                           OTHER PROVISIONS

                                    1.  Provisions contained in the Billing
                           Services Agreement that are applicable but are not
                           addressed in this Supplemental Agreement will be
                           considered to be an integral part hereof. Such
                           provisions include, but are not limited to, Notices,
                           Assignment, Counterparts, Headings, Relationships


                           between Parties, Media Releases, Disputes Resolution,
                           Severability, Waivers, Remedies, Governing Law,
                           Confidentiality and Entire Agreement.

                                    2.  HBS' lendor will be deemed a third-party
                           beneficiary of this Supplemental Agreement. Neither
                           the Supplemental Agreement nor any of the Agreements
                           or documents related to the Collateral may be
                           modified or amended in any manner which would
                           materially and adversely affect any of lendor's
                           rights without lendor's prior written consent.

                                    3.  HBS's rights under this Supplemental
                           Agreement shall inure to the benefit of its
                           successors and assigns. Assignment of any part of the
                           obligations and liabilities of CUSTOMER to HBS and
                           delivery by HBS of any part of the Collateral will
                           fully discharge HBS from responsibility for that part
                           of Collateral. If CUSTOMER is more than one person or
                           entity, all representations, warranties and
                           agreements contained herein are joint and several.
                           CUSTOMER's obligations under this Supplemental
                           Agreement shall bind CUSTOMER's personal
                           representatives, successors and assigns.

                                    4.  Neither delay in exercise nor partial
                           exercise of any of HBS's remedies or rights shall
                           waive further exercise of those remedies or rights.
                           HBS's failure to exercise remedies or rights does not
                           waive subsequent exercise of those remedies or
                           rights. HBS's waiver of any default does not waive
                           further defaults. HBS's waiver of any rights in this
                           Supplemental Agreement or any of the other Agreements
                           or of any default or Event of Default is binding only
                           if it is in writing.

                           HBS may remedy any default without waiving it.

                                    5.  If CUSTOMER fails to perform any of
                           CUSTOMER's obligations and liabilities, HBS may
                           (without obligation to do so) perform such
                           obligations on CUSTOMER's behalf and be reimbursed by
                           CUSTOMER on demand for any sum so paid, including
                           without limitation, attorney's fees and other legal
                           expenses, plus interest on those sums from the date
                           of demand for payment therefor to the date of payment
                           at the rate of Prime plus 4% per annum. Sums to be
                           reimbursed shall be secured by the Collateral.

                                    6.  Although no interest is contemplated as
                           part of the obligations and liabilities except as
                           expressly set forth herein, to the extent that
                           interest is imputed or deemed by a court of competent
                           jurisdiction to have been charged, interest shall not
                           exceed the maximum amount of non-usurious interest
                           that may be contracted for, taken, reserved, charged,
                           or received under law; any interest in excess of that
                           maximum amount shall be credited to the non-interest
                           obligations and liabilities of CUSTOMER to HBS under
                           the Agreements, and if they have all been paid in
                           full, refunded.


                                    7.  No provision of this Supplemental
                           Agreement shall be modified or limited except by
                           written agreement of the parties hereto.

                                    8.  The unenforceability of any provision of
                           this Supplemental Agreement will not affect the
                           enforceability or validity of any other provision.

                                    9.  This Supplemental Agreement will be
                           construed according to the internal laws of the State
                           of Texas without regard to those laws relating to
                           choice of law or choice of forum.

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Agreement
to be executed and delivered by their duly authorized officers as of the
Effective Date.


CUSTOMER:                                 HOLD BILLING SERVICES, LTD.
                                          a Texas Limited Partnership

                                          By: HBS, Inc.
- -----------------------------------


By:                                       By:
   --------------------------------          --------------------------------
                                             David W. Mechler, Jr.
                                             Vice President - Finance