Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Explicit Communication Transfer (ECT) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification (V10.0.0; 3GPP TS 24.629 vers
The present document specifies the stage three (protocol description) of the Explicit Communication transfer (ECT) supplementary service@ based on stage one and two of the ISDN ECT supplementary service. It provides the protocol details in the IP Multimedia (IM) Core Network (CN) subsystem based on the Session Initiation Protocol (SIP) and the Session Description Protocol (SDP). The present document is applicable to User Equipment (UE) and Application Servers (AS) which are intended to support the ECT supplementary service.