Summary

Recommendation ITU-T F.740.6 specifies the requirements of the Internet protocol multimedia subsystem (IMS) early media and extension service (EMES) system. It defines the reference framework and requirements for network, user equipment (UE), and security of the system. It also describes several typical application scenarios including:

–           playing the early media before the called party alerting;

–           playing the early media during the called party alerting;

–           playing the early media when the call is failed;

–           playing the media after the call is answered;

–           playing the media during the release of the call;

–           interactive scenarios.