Summary

This Supplementary Service describes the procedures and the signalling protocol for the Call Waiting supplementary service (SS-CW) in H.323 (Packet based multimedia communications systems) networks.

SS-CW permits a served user while being busy to be informed of an incoming call with an indication. The user then has the choice of accepting, rejecting or ignoring the waiting call. The user calling the busy party is informed about the call waiting condition.

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.