Within the ACCESSNET ® -T IP network, the TGW is logically connected to the Switch-
ing Controller Function (SCF). The signalling of the TGW for the registration and call
control with the telephone system is performed according to the SIP standard (Session
Initiation Protocol). The Real-time Transport Protocol (RTP) is used as the transmission
protocol for the voice. The voice itself is encoded in the G.711 format (A-law or µ-law).