Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Signalling Control Protocol; Communication HOLD (HOLD); PSTN/ISDN simulation services (V1.2.1)
The present document specifies the@ stage three@ Protocol Description of the Communication Hold (HOLD) services@ based on stage one and two of the ISDN HOLD (HOLD) supplementary services. Within the Next Generation Network (NGN) the stage 3 description is specified using the IP Multimedia Call Control Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP).