The present document specifies the interworking between SIP-I based circuit-switched core network, as specified in TS 23.231 [3] and TS 29.231 [4], with out-of-band transcoder control related...
The present document specifies the principles of interworking between the 3GPP IM CN subsystem and BICC/ISUP based legacy CS networks, in order to support IM basic voice, data and multimedia calls....