<PAGE>   1
                                                                   EXHIBIT 10.20

                         WORLDCOM NETWORK SERVICES, INC.

                     CLASSIC/TRANSCEND(TM)SWITCHED SERVICES

                            PROGRAM ENROLLMENT TERMS

         These PROGRAM ENROLLMENT TERMS (the "PET") are made by and between
WorldCom Network Services, Inc. ("WORLDCOM") and AmeriVision Communications,
Inc. ("CUSTOMER") and are a part of their Telecommunications Services Agreement
for Switched Services. Capitalized terms not defined herein shall have the
meaning ascribed to them in the TSA, the Service Schedule or the applicable Rate
and Discount Schedule.


1.       SERVICE TERM: The Service Term shall commence as of April 1, 1999 (the
         "EFFECTIVE DATE") and shall continue through and include March 31, 2002
         (the "SERVICE TERM"), subject to earlier termination as provided in
         Subsection 2(B) below. Provided, however, notwithstanding the
         immediately preceding sentence, the rates set forth herein will be
         effective as of      , 1999 (the "RATE EFFECTIVE DATE"). Upon
         expiration of the Service Term, the Switched Services in question will
         continue to be provided pursuant to the same terms and conditions as
         are then in effect (including without limitation, the applicable rates,
         discounts and commitments, if any), subject to termination by either
         party upon sixty (60) days prior written notice to the other party.


2.       CUSTOMER'S MINIMUM REVENUE COMMITMENT:

         (A) Commencing with the Effective Date (as determined under Section 1
         above) and continuing through the end of the Service Term (including
         any extensions thereto) (the "COMMITMENT PERIOD"), Customer agrees to
         maintain, on a take-or-pay basis, cumulative Monthly Revenue (as
         defined in the applicable Rate and Discount Schedule) equal to at least
         the amounts shown below by the end of the respective months listed
         ("CUSTOMER'S MINIMUM REVENUE COMMITMENT").

<TABLE>
<CAPTION>

             END OF           CUSTOMER'S       END OF           CUSTOMER'S
             MONTH            COMMITMENT       MONTH            COMMITMENT
             -----            ----------       -----            ----------
<S>                           <C>              <C>              <C>
               1                $2,000,000       19             $38,000,000
               2                $4,000,000       20             $40,000,000
               3                $6,000,000       21             $42,000,000
               4                $8,000,000       22             $44,000,000
               5               $10,000,000       23             $46,000,000
               6               $12,000,000       24             $48,000,000
               7               $14,000,000       25             $50,000,000
               8               $16,000,000       26             $52,000,000
               9               $18,000,000       27             $54,000,000
              10               $20,000,000       28             $56,000,000
              11               $22,000,000       29             $58,000,000
              12               $24,000,000       30             $60,000,000

</TABLE>




--------------------
         --**-- This symbol signifies information from the agreement that has
been omitted because the Company has requested confidential treatment. The
information has been filed separately with the Securities and Exchange
Commission.

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         (B) Notwithstanding anything to the contrary contained in Subsection
         (A) above, as soon as Customer's cumulative Monthly Revenue (which will
         include any Deficiency Charges actually paid by Customer) is equal to
         at least $72,000,000, either party may cancel this Agreement in its
         entirety upon at least ninety (90) prior written notice to the other
         party.

3.       DEFICIENCY CHARGE: In the event Customer does not maintain Customer's
         Minimum Revenue Commitment in any month during the Commitment Period
         (regardless of whether Customer has commenced using any or all of the
         Switched Services described herein), then for those month(s) only,
         Customer will pay WorldCom the difference between Customer's Minimum
         Revenue Commitment and Customer's actual Monthly Revenue (as described
         in the applicable Rate and Discount Schedule) (the "DEFICIENCY
         CHARGE"). The Deficiency Charge will be due at the same time payment is
         due for Service provided to Customer, or immediately in an amount equal
         to Customer's Minimum Revenue Commitment for the unexpired portion of
         the Service Term, if WorldCom terminates this Agreement based on
         Customer's default. Provided, however, WorldCom agrees to waive any
         Deficiency Charges that arise solely due to a catastrophic network
         event which materially prevents Customer's use of Services hereunder
         sufficient to satisfy Customer's Minimum Revenue Commitment. In such
         case, Customer shall have the burden of proof in establishing the date
         and duration of such event as well as the general sources of Customer's
         traffic affected by such event. Provided, for purposes of this
         Agreement, any catastrophic network events lasting less than --**--
         and/or affecting less than --**-- minutes of Customer's traffic will be
         deemed not material.

4.       CANCELLATION WITHOUT CHARGE: The parties agree to substitute Subsection
         2(C) of the TSA to read in its entirety as follows:

         (C) Cancellation Without Charge. Notwithstanding anything to the
         contrary contained in Subsection 2(A) above, Customer may cancel this
         Agreement without incurring any cancellation charge if:

                  i. WorldCom fails to provide a network as warranted in Section
                  8 below and fails to cure such default within five (5) days
                  following written notice from Customer; or

                  ii. WorldCom fails to (a) deliver call detail records promptly
                  based on the frequency selected by Customer (i.e., monthly,
                  weekly or daily); or (b) submit ANI(s) relevant to such
                  Service Requests to the LECs within the time period described
                  in Subsection 1(B) above. Provided, however, Customer must
                  give WorldCom written notice of any such default under this
                  Subpart (ii) and an opportunity to cure such default within
                  five (5) days of the notice. In the event WorldCom fails to
                  cure any such default within the five-day period set forth in
                  this Subpart (ii) on more than three (3) occasions within any
                  six (6) month period, Customer may cancel this Agreement
                  without incurring any cancellation charge.


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5.       DISPUTED TRANSFER CHARGES: The parties agree to substitute the first
         sentence only of Subsection 3(A) and Subsection 3(B) of the TSA to read
         in their entirety as follows:

         (A) End Users. Customer will use reasonable efforts to obtain and upon
         WorldCom's request will provide WorldCom (within two (2) business days
         of the date of the request) a written Letter of Agency ("LOA")
         acceptable to WorldCom [or with any other means if approved by the
         Federal Communications Commission ("FCC") and any applicable public
         utility commission ("PUC") and accepted by the applicable local
         exchange provider provided the local exchange provider has the
         authority to accept or deny certain forms of LOAs (provided, further,
         nothing contained herein will require WorldCom to challenge the right
         of local exchange providers to accept or deny certain forms of LOAs),
         for each ANI indicating the consent of such end user of Customer ("END
         USER") to be served by Customer and transferred (by way of such End
         User's designated PIC) to the WorldCom network prior to order
         processing.

         (B) Transfer Charges/Disputed Transfers. Customer agrees that it is
         responsible for (i) all charges incurred by WorldCom to change the PIC
         of End Users to the WorldCom network, (ii) all charges incurred by
         WorldCom to change End Users back to their previous PIC arising from
         disputed transfers to the WorldCom network plus, at WorldCom's option,
         an administrative charge equal to --**-- of such charges, and (iii) any
         other damages suffered by or awards against WorldCom resulting from
         disputed transfers unless such damages or awards are the result of
         actions taken solely by WorldCom without any involvement (either
         directly or indirectly) by Customer.

6.       PAYMENT TERMS: The parties agree to substitute Subsection 5(A) and 5(B)
         of the TSA to read in their entirety as follows:

         (A) Payment. WorldCom billings for Switched Services hereunder are made
         on a monthly basis (or such other basis as may be mutually agreed to by
         the parties) following Start of Service. Subject to Subsection 5(C)
         below, Switched Services shall be billed at the rates set forth in the
         applicable Rate and Discount Schedule attached hereto. Customer will be
         notified of WorldCom's time of day rate periods (including WorldCom
         Recognized National Holidays). Discounts, if any, applicable to the
         rates for certain Services are set forth in the Rate and Discount
         Schedule. Customer will pay all undisputed charges relative to each
         WorldCom invoice for Switched Services within (i) --**-- days of the
         invoice date set forth on each WorldCom invoice to Customer with
         respect to Services provided in months 1 through 3 following the
         Effective Date of this Agreement, (ii) --**-- days of the invoice date
         set forth on each WorldCom invoice to Customer with respect to Services
         provided in months 4 through 6 following the Effective Date of this
         Agreement, and (iii) --**-- days of the invoice date set forth on each
         WorldCom invoice to Customer with respect to Services provided through
         the remainder of the Service Term (collectively, the "DUE DATE"). If
         payment is not received by WorldCom on or before the Due Date, Customer
         shall also pay a late fee in the amount of the lesser of one and
         one-half percent (1 1/2%) of the unpaid

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         balance of the charges for Switched Services rendered per month or the
         maximum lawful rate under applicable state law. Commencing with the
         Effective Date and continuing through the end of the Service Term,
         Customer agrees to provide WorldCom (a) unaudited financial statements
         within --**-- days following each month, (b) "reviewed" financial
         statements within --**-- days following each quarter, and (c) audited
         financial statements within --**-- days following the end of each of
         Customer's fiscal years.

         (B) Taxes. Customer acknowledges and understands that WorldCom computes
         all charges herein exclusive of any applicable federal, state or local
         use, excise, gross receipts, sales and privilege taxes, duties, fees or
         similar liabilities (other than general income or property taxes),
         whether charged to or against WorldCom or customer because of the
         Switched Services furnished to Customer ("ADDITIONAL CHARGES").
         Customer shall pay such Additional Charges in addition to all other
         charges provided for herein. Customer will not be liable for certain
         Additional Charges if Customer provides WorldCom with an appropriate
         exemption certificate. Provided, to the extent Customer is not an "end
         user" of the Services provided hereunder, with respect to any
         Additional Charges which are assessed solely on WorldCom's end users
         ("END USER CHARGES"), WorldCom agrees not to assess Customer such End
         User Charges. Provided, however, in the event WorldCom is required to
         collect End User Charges from Customer, Customer agrees to pay WorldCom
         such End User Charges unless Customer provides WorldCom a written
         certification, signed by an officer of Customer, that Customer has
         directly paid such End User Charges.

7.       PAYMENT OF DISPUTED AMOUNTS: Notwithstanding anything to the contrary
         contained in Subsection 5(D) of the TSA, in the event Customer pays
         WorldCom any amount which is ultimately determined not to be due
         WorldCom, WorldCom agrees to pay Customer such amount plus interest on
         such amount equal to one and one-half (1 1/2%) of such amount per month
         or the maximum lawful rate under applicable state law.

8.       CREDIT: The parties agree to delete the first two sentences of
         Subsection 6(A) of the TSA.

9.       REMEDIES FOR BREACH: In the event WorldCom elects its remedies under
         Subsection 7(B) of the Agreement and bills Customer's End Users
         directly, WorldCom agrees to collect any amounts owing from such End
         Users in good faith and in accordance with reasonable business
         practices. In the event WorldCom collects any amounts from Customer's
         End Users, such amounts will offset any amounts owed by Customer under
         this Agreement. In other words, Customer's liability for charges for
         Services rendered and the Deficiency Charge, if applicable, will be
         reduced by any amounts WorldCom collects from Customer's End Users.

10.      FORCE MAJEURE: The parties agree to substitute Section 10 of the TSA to
         read in its entirety as follows:


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         If either party's performance of this Agreement or any obligation
         hereunder (excluding payments owed by Customer for Services rendered by
         WorldCom) is prevented, restricted or interfered with by causes beyond
         its reasonable control including, but not limited to, acts of God,
         fire, explosion, vandalism, cable cut, storm or other similar
         occurrence, any law, order, regulation, direction, action or request of
         the United States government, or state or local governments, or of any
         department, agency, commission, court bureau, corporation or other
         instrumentality of any one or more such governments, or of any civil or
         military authority, or by national emergency, insurrection, riot, war,
         strike, lockout or work stoppage or other labor difficulties, or
         supplier failure, shortage, breach or delay, then the affected party
         shall be excused from such performance on a day-to-day basis to the
         extent of such restriction or interference. The affected party shall
         use reasonable efforts under the circumstances to avoid or remove such
         causes or nonperformance and shall proceed to perform with reasonable
         dispatch whenever such causes are removed or cease.

11.      OTHER AGREEMENTS: The parties agree to substitute Subsection 24(B) of
         the TSA to read in its entirety as follows:

         (B) Third Party Agreements. If Customer acquires or merges or combines
         with a third party after the Effective Date of this Agreement, and such
         third party has existing agreement(s) with a member of the WorldCom
         Group (collectively referred to as the "THIRD PARTY AGREEMENTS") for
         the provision of switched telecommunications services ("THIRD PARTY
         EXISTING SERVICES"), then ninety (90) days following the date of such
         acquisition, merger or combination (or such earlier date contained in a
         written notice from customer to WorldCom) (the "TRANSFER DATE"), if
         requested by WorldCom, Customer agrees to select one Agreement (either
         this Agreement or a Third Party Agreement) (the "SURVIVING AGREEMENT")
         pursuant to which all switched services will be provided to Customer
         and all members of the Customer Group and all other agreements (the
         "CANCELED AGREEMENTS") will be canceled and no longer in force or
         effect except for commitments, if any, contained in the Canceled
         Agreements and charges and credits due for Services provided prior to
         the effective date of cancellation of such Canceled Agreements.
         Further, as of the effective date of cancellation, Third Party Existing
         Services or, if applicable, the Services provided under this Agreement
         will be provisioned under the Surviving Agreement, and the aggregate
         commitment(s) (e.g., revenue, volume, minute, etc.) remaining under the
         Canceled Agreements shall be added on a pro rata basis to the
         commitment(s), if any, existing under the Surviving Agreement.
         Simultaneous with the closing of such acquisition, combination or
         merger, Customer will cause such third party and all of its affiliates
         who are parties to such Third Party Agreements, to agree to such
         cancellation(s) as appropriate and the provision of such Services, as
         appropriate under the terms and conditions of the Surviving Agreement
         and Customer agrees to provide WorldCom with reasonable documentation
         evidencing such agreement.


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12.      TARIFF REFERENCES: Except to the extent specifically referenced in this
         Agreement, this Agreement does not incorporate any terms or conditions
         contained in any federal and/or state tariffs filed or to be filed by
         WorldCom or any of its affiliates.

13.      DISPUTE RESOLUTION: If the parties are unable to resolve any dispute
         arising under or relating to this Agreement, the parties may resolve
         such disagreement or dispute as follows:

         (a) Either party may, by written notice to the other party (the
         "DISPUTE NOTICE"), request that a designated representative from each
         of the parties attempt to resolve the matter. Within fifteen (15) days
         after delivery of the Dispute Notice such representatives of both
         parties will use good faith efforts to schedule a meeting at a mutually
         acceptable time and place to attempt to resolve the dispute.

         (b) If the matter has not been resolved within thirty (30) days after
         delivery of the Dispute Notice, or if such representatives fail to meet
         within fifteen (15) days after delivery of such Dispute Notice, either
         party may initiate mediation in accordance with the procedures set
         forth in (C) below. All negotiations conducted by such representatives
         shall be confidential and shall be treated as compromise and settlement
         negotiations for purposes of federal and state rules of evidence.

         (c) If such representatives are unable to resolve the dispute or have
         failed to meet, the parties may elect to participate in a nonbinding
         mediation procedure as follows:

                  (A) A mediator will be selected by having counsel for each
                  party agree on a single person to act as mediator. The
                  parties' counsel as well as up to three (3) representatives of
                  each of the parties will appear before the mediator at a time
                  and place determined by the mediator, but not more than sixty
                  (60) days after delivery of the Dispute Notice. The fees of
                  the mediator and other costs of the mediation will be shared
                  equally by the parties.

                  (B) Each party will present a review of the matter and its
                  position with respect to such matter. At the conclusion of
                  both presentations the parties may ask questions of each
                  other. Either party may abandon the mediation procedure at the
                  end of the presentation and question periods and the mediation
                  procedure shall not be binding on either party.

                  (C) If the matter is not resolved after applying the mediation
                  procedure set forth above, or if either party refuses to take
                  part in the mediation process, either party may initiate legal
                  proceedings to resolve their dispute.

         (D) The provisions of this Section 13 shall not preclude a party form
         instituting legal proceedings seeking injunctive relief (including,
         without limitation, a temporary restraining

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         order) prior to the commencement or completion of the specified dispute
         resolution procedures.

14.      REQUIREMENTS AGREEMENT: In consideration of the rates set forth in the
         Rate Schedule, and other good and valuable consideration, the receipt
         and sufficiency of which are hereby acknowledged, during the Service
         Term Customer agrees to purchase one hundred percent (100%) of its
         telecommunications services requirements for SWITCHED ACCESS Service
         (1+ and Toll Free) (which services are described in this Agreement)
         from WorldCom under the terms and conditions set forth in this
         Agreement ("CUSTOMER'S REQUIREMENTS OBLIGATION"). Upon request from
         WorldCom, Customer agrees to provide WorldCom reasonable documentation
         evidencing Customer's compliance with this Section 14 and if requested
         by WorldCom, agrees to allow WorldCom or its representatives to audit
         Customer's books and records as may be necessary solely to ensure
         Customer's compliance with Customer's Requirements Obligation. In the
         event Customer is in breach of this Agreement, in addition to
         WorldCom's other rights and remedies described in this Agreement,
         notwithstanding anything to the contrary contained in the Agreement,
         WorldCom shall have the right to immediately increase Customer's
         SWITCHED ACCESS Service rates set forth in the Rate Schedule to --**--.
         Any increase as described herein will not affect Customer's Minimum
         Revenue Commitment set forth in Section 2 above.

15.      SEMI-ANNUAL REVIEW OF RATES: Provided Customer is in substantial
         compliance with the terms of this Agreement, commencing September 1,
         1999, and continuing on the first day of every seventh (7th) month
         thereafter (i.e., March 1, 2000; September 1, 2000; March 1, 2001;
         etc.), WorldCom and Customer agree to review the rates hereunder with a
         view to adjusting in good faith such rates taking into account (i)
         rates then generally available to WorldCom's other wholesale customers
         under other "programs" being offered by WorldCom when taken as a whole,
         and (ii) rates then generally available to WorldCom's other wholesale
         customers for similar services, commitments and other terms. In
         conducting such review, the parties agree to take into account state
         and/or federal mandates regarding local access reform, if any, that may
         affect the cost of the Services provided hereunder and which result in
         either an increase or decrease to such rates. Provided, however,
         nothing contained in this Section 15 will obligate WorldCom to reduce
         Customer's rates under this Agreement.

16.      CUSTOMER PROPRIETARY INFORMATION: In addition to WorldCom's obligations
         to protect Customer's Confidential Information under Section 20 of the
         TSA, WorldCom agrees to comply with all applicable laws, rules and
         regulations regarding Customer's proprietary network information and
         the proprietary network information of Customer's End Users which
         information has been directly provided or disclosed by Customer to
         WorldCom.

17.      SUBORDINATION AGREEMENT: Simultaneous with the execution of this
         Agreement, WorldCom agrees to execute the attached Intercreditor
         Agreement by and between WorldCom, Customer and Coast Business Credit,
         a division of Southern Pacific Bank.

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18.      CREDIT/SETTLEMENT:

         (A) In consideration of the terms and conditions contained in this
         Agreement, Customer's payment to WorldCom of --**-- on or before the
         due date of WorldCom's April 1, 1999 invoice, and other good and
         valuable consideration the receipt and sufficiency of which are hereby
         acknowledged, upon execution of this Agreement, WorldCom agrees to give
         Customer a credit (the "CREDIT") equal to --**-- which the parties
         agree equals all invoiced and unpaid charges including interest and
         late fees owed by Customer for Services provided by WorldCom prior to
         January 1, 1999 (i.e., up through and including the January, 1999
         invoice) (the "SETTLEMENT DATE") (including any Services provided to
         Hebron Communication Corporation or American Electronics Corporation
         d/b/a Discount Long Distance assertedly through Customer by WorldCom
         through the Settlement Date. For purposes of this Agreement, such
         Services shall include without limitation (i) the following WorldCom
         billing account numbers for Switched Services: --**--; and the
         following WorldCom billing account numbers for private line services:
         --**--, and any other accounts for which Customer had payment
         responsibility under that certain Payment Agreement dated June 1, 1996,
         and executed by Customer, WorldCom and National Telephone &
         Communications, Inc., including without limitation, billing account
         numbers --**--. In addition to the Credit described herein, WorldCom
         agrees to waive any finance charges up through and including March 31,
         1999 (i.e., the April, 1999 invoice). WorldCom acknowledges that the
         rates charged to Customer from and after November 30, 1998, through the
         Rate Effective Date described in Section 1 above shall be consistent
         with the rates provided under the WilMAX Telecommunications Services
         Agreement dated June 1, 1996 (the "NTC AGREEMENT"), as referenced in
         that certain Payment Agreement by and between WorldCom, Customer and
         National Telephone & Communications, Inc. dated June 1, 1996.

         (B) In consideration hereof, Customer and WorldCom, together with and
         on behalf of their respective predecessors, successors, parents,
         subsidiaries, affiliates, assigns, agents, directors, officers,
         employees and shareholders hereby release the other party and its
         respective predecessors, successors, parents, subsidiaries, affiliates,
         assigns, agents, directors, officers, employees and shareholders, from
         any and all claims, demands, damages, causes of action, debts,
         obligations, liabilities or controversies of any kind whatsoever,
         whether at law or in equity, whether before a local, state or federal
         court, arbitrator or state or federal administrative agency or
         commission, and whether known or unknown, liquidated or unliquidated,
         that the releasing party has or may have against the other on account
         of or in any way related to the NTC Agreement, any Services provided or
         billed to Customer prior to the Settlement Date, or any statements
         and/or representations made by the other party's personnel regarding
         the Services provided to Customer (the "DISPUTED MATTERS"). Upon
         receipt of the Credit, (i) it shall be the full and final settlement of
         each party's disputes and claims pertaining to the Disputed Matters,
         and (ii) each party shall thereafter be barred from bringing any
         charge, complaint or other action against the other relating to the
         Disputed Matters for all periods prior to the Settlement Date. It is
         understood and agreed by the parties that this Amendment is not to be
         construed or used as an admission of any liability

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         whatsoever by either party, its officers, directors, employees, agents,
         representatives, affiliates or subsidiaries, which liability is
         expressly denied, nor is it to be construed or used as an admission
         that a party has committed or engaged in any deceptive or unlawful act,
         violation or other breach of duty imposed by the NTC Agreement,
         applicable tariffs or applicable law.



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         IN WITNESS WHEREOF, the parties have executed these
Classic/TRANSCEND(TM) Switched Services Program Enrollment Terms.

WORLDCOM NETWORK SERVICES, INC.                 AMERIVISION COMMUNICATIONS,
INC.


By:     /s/ John H. Krummez                     By:  /s/ Stephen D. Halliday
   -------------------------------                 -----------------------------
       (Signature)                                         (Signature)

           John H. Krummez                              Stephen D. Halliday
----------------------------------              --------------------------------
             (Print Name)                                  (Print Name)

         Senior Vice President                               President
----------------------------------              --------------------------------
               (Title)                                       (Title)




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                         WORLDCOM NETWORK SERVICES, INC.

                                SWITCHED SERVICES

                         RATE SCHEDULES FOR AMERIVISION


         Capitalized terms not defined in this Rate Schedule shall have the
meaning ascribed to them in the Telecommunications Services Agreement,
TSA#AVI-990301, between AmeriVision Communications, Inc. and WorldCom Network
Services, Inc.

                                      RATES

(A)      TERMINATION Service

         --**--


(B)      TOLL FREE ORIGINATION Service

         --**--

(C)      SWITCHED ACCESS Service

         --**--

(D)      DEDICATED ACCESS Service

         --**--

(E)      TRAVEL CARD Service

         --**--

(F)      Directory Assistance

         --**--

ATTACHMENTS:

         --**--

-------------------
         --**-- This symbol signifies information from the agreement that has
been omitted because the Company has requested confidential treatment. The
information has been filed separately with the Securities and Exchange
Commission.