6 Call control

26.2363GPPPacket switched conversational multimedia applicationsTransport protocolsTS

Functional requirements for call control are specified in 3GPP TS 23.228 [8].

The required signalling functions and call control protocols are specified in 3GPP TS 24.229 [7].

QoS authorization issues and interworking with the IM subsystem in general are covered in 3GPP TS 23.207 [10].