CONTENTS

 1     Scope
 2     References
 3     Definitions
 4     Abbreviations
 5     Information flows used in this Supplement
 6     Leaf initiated call registration
        6.1     Root-party controlled actions
        6.2     Network controlled actions
                  6.2.1     Handling of LIJ call join requests when an active LIJ call has been established
                  6.2.2     Handling of LIJ call and bearer requests when an active LIJ call and its set of bearers have been established
                  6.2.3     Handling of leaf join requests when no active LIJ call is in progress or a LIJ call is active but its set of bearers have not been established
                  6.2.4     Root-party notification options upon completion of join requests
        6.3     Registration process for a root serving node
        6.4     Registration process for a leaf serving node
 7     Serving node LIJ procedures
 8     Overview of Peer-to-Peer Functional Entity Actions
 9     Functional Entity Actions
        9.1     LIJ Call Creation
                  9.1.1     Root-Party Request to Create a LIJ Call and Bearer (without attachment of a Leaf‑Party)
                  9.1.2     Root-Party Request to Create a LIJ Call and Bearer (with attachment of a Leaf-Party)
                  9.1.3     Leaf-Party Request to Join LIJ Call and Bearer (no active LIJ call exists)
        9.2     Leaf-Party Request to Join Active LIJ Call and Bearer
                  9.2.1     Leaf-Party Request to Join Active Call and Bearer in Root Serving Node – Root Screening
                  9.2.2     Leaf-Party Request to Join Active Call and Bearer in Root Serving Node –Network Screening
                  9.2.3     Leaf-Party Request to Join Active Call and Bearer in Leaf Serving Node –Root Screening
                  9.2.4     Leaf-Party Request to Join Active LIJ Call and Bearer
        9.3     Removal of Leaf-Party from a LIJ Call and Bearer(s) Requested by the Root-Party
                  9.3.1     Removal of leaf-party requested by root-party (multiple leaf-parties attached to bearer at leaf serving node)
                  9.3.2     Removal of leaf-party requested by root-party (single leaf-party attached to bearer at leaf serving node)
                  9.3.3     Removal of leaf-party requested by root-party (last leaf-party attached to LIJ call)
        9.4     Leaf-Party Requests to be Released from the LIJ Call and Bearer(s)
                  9.4.1     Leaf-party release request (multiple leaf-parties attached to bearer at leaf serving node)
                  9.4.2     Leaf-party release request (single leaf-party attached to bearer at leaf serving node)
                  9.4.3     Leaf-party release request (last leaf-party attached to LIJ call)
        9.5     LIJ Call and Bearer Release by Root-Party
                  9.5.1     Root-Party Requests to Terminate LIJ Call (with no associated Leaf‑Parties)
                  9.5.2     Root-Party Requests to Terminate LIJ Call (with several Leaf SN associated with the LIJ Call)
        9.6     LIJ Call Leaf-Party detaches from Bearer
                  9.6.1     Leaf-Party Requests to Detach from Bearer
                  9.6.2     Leaf-Party Requests to Detach from Bearer