Table of 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
 8     Interworking             
        8.1     Interworking with SCN
        8.2     Interworking with other supplementary services 
        8.3     Interaction with ITU-T H.225.0 parameters          
 9     Gatekeeper actions  
        9.1     Normal procedures       
        9.2     Alternative GK procedures for SS-PICKUP of an alerting call        
        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       
       10.2     Communication between a signalling entity and its signalling entity user (primitives and parameters)    
       10.3     Call states      
       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