ITU-T Recommendations

This Recommendation describes the procedures and the signalling protocol scenarios for the Call Park and Call Pickup supplementary services in H.323.Call Park (SS-PARK) is a supplementary service that enables the Parking User A to place an existing call with user B (Parked User) to a Parking Position. The call can later be picked-up by retrieving the parked party from the same terminal where the park took place or from another terminal. Call Pickup (SS-PICKUP) is a supplementary service that enables the Picking-up User to either pick up a parked call or to pick up an alerting call. Upon successful invocation of SS-PICKUP, the Picking-up User is connected with the Parked User respectively with the calling User.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.