Summary

This Recommendation describes the procedures and the signalling protocol for the Call Transfer supplementary service (SS-CT) in H.323 (Packet-based multimedia communications systems) networks.

SS-CT is a supplementary service which enables the served user A to transform an existing call (user A-user B) into a new call between user B and a user C selected by user A. User A may or may not have a call established with user C prior to Call Transfer.

This Recommendation makes use of the "Generic functional protocol for the support of supplementary services in H.323" as defined in Recommendation H.450.1

The procedures and the signalling protocol of this Recommendation are derived from the Call Transfer supplementary service specified in ISO/IEC 13865 and 13869.