E.2.1 General

29.1633GPPInterworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networksTS

In addition to the control plane Interworking between SIP and ISUP or BICC, interactions between the H.245 signalling at the CS side and SIP/SDP signalling are described.

The establishment of the H.223 multiplexing protocol and the subsequent H.245 signalling procedures take place after the set-up and both-way through-connection of the CS bearer.