CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
 4     Abbreviations and acronyms
 5     Description
        5.1     Call Park
        5.2     Call Pickup
 6     Messages and information elements
 7     Procedures
        7.1     Actions at the Parking Endpoint A
        7.2     Actions at the Parked Endpoint B
        7.3     Actions at the Parked-To Endpoint
        7.4     Actions at the Calling endpoint (SS-PICKUP of an alerting call)
        7.5     Actions at the Alerting endpoint (SS-PICKUP of an alerting call)
        7.6     Actions at the Served endpoint
        7.7     Actions at a Pickup Group member endpoint
        7.8     Actions at the Picking-up Endpoint
        7.9     Alternative procedures
                  7.9.1     Local SS-PARK and pickup from local park
 8     Interworking
        8.1     Interworking with SCN
        8.2     Interworking with other supplementary services
                  8.2.1     Call Diversion (H.450.3)
                  8.2.2     Call Hold (H.450.4)
                  8.2.3     Call Waiting (H.450.6)
                  8.2.4     H.323 Conference
                  8.2.5     Call Transfer (H.450.2)
        8.3     Interaction with H.225.0 parameters
 9     Gatekeeper actions
        9.1     Normal procedures
        9.2     Alternative GK procedures for SS-PICKUP of an Alerting call
                  9.2.1     Alerting endpoint does not support SS-PICKUP
                  9.2.2     Calling endpoint and Alerting endpoint do not support SS-PICKUP
                  9.2.3     Group pickup of an alerting call at the gatekeeper
        9.3     Alternative GK procedures for SS-PARK and SS-PICKUP of a parked call
10     Dynamic description
       10.1     Operational model and signal flows
                 10.1.1     SS-PARK
                 10.1.2     SS-PICKUP of a parked call, unpark
                 10.1.3     SS-PICKUP of an alerting call
       10.2     Communication between a Signalling entity and its Signalling entity user (Primitives and Parameters)
                 10.2.1     Parking endpoint
                 10.2.2     Parked endpoint
                 10.2.3     Parked-To endpoint
                 10.2.4     Picking-up endpoint
                 10.2.5     Calling endpoint
                 10.2.6     Alerting endpoint
                 10.2.7     Served endpoint
                 10.2.8     Group Member endpoint
       10.3     Call States
                 10.3.1     Parking Endpoint A
                 10.3.2     Parked Endpoint B
                 10.3.3     Parked-To Endpoint (Parking Position)
                 10.3.4     Calling endpoint
                 10.3.5     Alerting endpoint
                 10.3.6     Served endpoint
                 10.3.7     Group member endpoint
                 10.3.8     Picking-up Endpoint
       10.4     Timers
11     Operation in Support of SS-PARK and SS-PICKUP
12     Specification and Description Language (SDL) Diagrams
       12.1     SS-PARK SDLs
       12.2     SS-PICKUP SDLs
       12.3     SS-PARK, SS-PICKUP Group notifications SDLs