Section: Subscriber charging 5.5.1.0 General
Content: The charging data collected from the HPLMN, interrogating PLMN, and/or VPLMN network elements is employed to determine the network utilization charges for the basic and supplementary services utilized by the home subscribers of the PLMN. The charges calculated are then combined with the network access (subscription) charges and billed to those customers directly serviced by the PLMN. For those subscribers handled by Service Providers, the billing information is employed for both wholesale (Network Operator to Service Provider) and retail (Service Provider to Subscriber) billing. Consequently, having been processed by the PLMN billing system, the charging data collected from the network elements may also be sent to the Service Provider for further processing.