CONTENTS

 1     Scope
 2     References
 3     Definitions
 4     Abbreviations
 5     Information flows used in this Supplement
 6     Registered call registration
        6.1     Call registering party controlled actions
        6.2     Network controlled actions
                  6.2.1     Handling of call join requests when an active registered call has been established
                  6.2.2     Handling of call join requests when no active registered call exists
                  6.2.3     Call initiating party notification options upon completion of join requests
        6.3     Registration process for an initiator's serving node
        6.4     Registration process for a joining party's serving node
 7     Serving node Call Join procedures
 8     Overview of Peer-to-Peer Functional Entity Actions
 9     Functional Entity Actions
        9.1     Registered Call Creation
                  9.1.1     Call Initiating Party Request to Create a Registered Call (without attachment of a another Party)
                  9.1.2     Call Initiating Party Request to Create a Registered Call (with attachment of another Party)
                  9.1.3     Joining Party Request to Join a Registered Call – No Active Call
        9.2     Joining Party Request to Join Active Registered Call
                  9.2.1     Joining Party Request to Join Active Call in Initiator's Serving Node –Initiator Screening
                  9.2.2     Joining Party Request to Join Active Call in Initiator's Serving Node –Network Screening
                  9.2.3     Party Request to Join Active Call in a Joining Party's Serving Node –Initiator Screening
                  9.2.4     Party Request to Join Active Call in a Joining Party's Serving Node –Network Screening
        9.3     Removal of Party from a Registered Call requested by the Call Initiating Party
                  9.3.1     Removal of party requested by call initiating party – (multiple parties attached to registered call at joining party's serving node)
                  9.3.2     Removal of a party requested by call initiating party (single party attached to registered call at joining party's serving node)
                  9.3.3     Removal of a party requested by call initiating party (last party attached to registered call)
        9.4     Party Requests to be Released from the Registered Call
                  9.4.1     Party release request (multiple parties attached to registered call at joining party's serving node)
                  9.4.2     Party release request (single party attached to registered call at joining party'sserving node)
                  9.4.3     Party release request (last party attached to registered call)
        9.5     Registered Call Release by Call Initiating Party
                  9.5.1     Call Initiating Party Requests to Terminate Registered Call (with no associated parties)
                  9.5.2     Call Initiating Party Requests to Terminate Registered Call (with several other serving nodes associated with the registered call)