The processing of billing is as follows:
The customer initiates Access Service Requests (ASRs), which are translated into service orders to convert, install or modify access or collocation services.
These completed service orders are used to update the customer's Customer Service Record (CSR). The CSR provides an inventory of items that have a monthly recurring charge associated with them. Non-recurring charges are included in the Other Charges and Credits section of the bill.
The billing system receives and stores the data changes and generates appropriate recurring and non-recurring charges for inclusion in monthly access or collocation bills.
When access usage records are generated, they are passed to the billing system. The billing system generates the appropriate Minutes Of Use (MOU) charges for inclusion in monthly access bills.
In Verizon, once access or collocation charges are generated within the billing system, they are divided among a series of separate Billing Account Numbers (BANs).
Figure: Verizon Billing Process Flow