Content Service is a capability to examine IP/TCP/UDP headers, payload and enable billing based on the content being provided. Abbreviations: BMA Billing Mediation Agent. A BMA is the server that receives accounting records. QuotaMgr Quota Manager. This is a server that receives requests and returns a billing quota for prepaid billing charges. VRF Virtual Routing and Forwarding UDB User Database. The user database is a service that translates a client IP address into a user identifier. GPRS General Packet Radio Service. GTP GPRS Tunneling Protocol. Transfer Protocol for Charging Detail Records to BMAs and billing quota from quota managers. IPC Inter Processor Communicaiton. Network Server The service provider who provides the online service. AdControl The Cisco product to enable service providers to share subscriber data with advertising providers in a controlled and secure manner. Gx Gx is a reference point located between the Policy and Charging Rules Function (PCRF) and the Policy and Charging Enforcement Function (PCEF). Three types of networks namely, 3G UMTS, 4G LTE and 4G WiMax use the 3GPP Gx interface as the standard policy control interface. NBAR Network Based Application Recognition.