Exhibit C

Ameritech, SWBT, PB, NB

Exhibit C

Billing and Collection Services:

Invoice Billing Service

May 2001

Exhibit C

Ameritech, SWBT, PB, NB

TABLE OF CONTENTS

1.0DESCRIPTION OF INVOICE BILLING AND COLLECTION SERVICES....

2.0TRANSMISSION......

3.0UNBILLABLES......

4.0TAXES......

May 2001

Exhibit C

Ameritech, SWBT, PB, NB

NOTE: Invoice Billing is not available in Southern New England Telephone.

1.0DESCRIPTION OF INVOICE BILLING AND COLLECTION SERVICES

1.1.Invoice Billing and Collection Services consist of End User billing data records that have been invoice prepared and sent to SBC Telco as an End User invoice. The invoice will contain call detail that has been rated by the Customer and/or summary records which may contain credits, adjustments, promotions, discounts, other charges and taxes that have been calculated by the Customer. SBC Telco will not be required to perform any additional calculations on the Customer portion of the End User bill

1.2.SBC Telco maintains the sole right to modify and/or require bill presentation formats in a manner consistent with SBC Telco's own bill presentation format.

2.0TRANSMISSION

2.1The Customer will transmit initial invoices in synchronization with the End User's billing cycle as assigned by SBC Telco. SBC Telco will not be required to alter existing cycles. The Customer will transmit initial invoices no less than five (5) calendar days prior to SBC Telco's scheduled End User billing period dates (e.g., End User bill period 2/22/05 should be transmitted no later than 2/18/05).

2.2Upon receipt of the invoices, SBC Telco will process them in such a way

that they may be incorporated with an End User's next bill from SBC Telco according to SBC Telco's normally scheduled billing cycle.

2.3If SBC Telco receives transmissions from the Customer for End Users

who do not fall in SBC Telco's next billing cycle, SBC Telco will hold the Customer invoice for that End User until the appropriate billing cycle.

2.4SBC Telco is to reroute the invoices to the correct SBC Telco billing cycle

if the Customer has routed them to the incorrect SBC Telco billing cycle.

2.5Invoice formatted messages will not be forwarded to SBC Telco with non-

invoice formatted messages. If the Customer submits messages for both invoice and non-invoice presentation on the end user bill, a separate entity (CIC Code) will be required for each.

3.0UNBILLABLES

3.1For purposes of invoice billing error investigation, the invoice will not be

split apart by SBC Telco if some of the messages are billable and some are not. The entire invoice will be returned to the Customer with the appropriate error code.

4.0TAXES

4.1The Customer will apply all applicable taxes to the End User invoice data.

SBC Telco will not calculate additional taxes on the Customer invoice data. SBC Telco will bill the End User in the format provided by the Customer within its invoice.

4.2The Customer acknowledges that SBC Telco will not maintain tax reports

for invoice billing. The Customer is solely responsible to maintain all required tax information within their own system.

4.3SBC Telco will remit payment to the Customer for the collected taxes as

part of the purchase of accounts receivables payment.

4.4Billed Taxes are defined for invoice billing to represent the billed taxes

(federal, state, and local) associated with all the Customer revenue amounts included in the transmission. The Customer is responsible for determining and calculating all taxes.

5.0PRICING

5.1SWBT will offer invoice bill rendering service to SBCLD priced on a per page per bill basis as defined in Exhibit A of this Agreement.

May 2001