CONTENTS

 1     Scope
 2     References
 3     Definitions
 4     Abbreviations
 5     Information flows used in this Supplement
 6     Overview of call control level peer-to-peer functional entity actions
 7     Call establishment
        7.1     Two-party call establishment
        7.2     Establishment of a call with three or more parties
 8     Addition of one or more parties to a call
        8.1     Addition of one party to a call
        8.2     Addition of two or more parties to a call
 9     Release of a party from an existing call
        9.1     General rules for release of a party
        9.2     Release of a party from an existing two-party call
                  9.2.1     Release of a party by the call owner – Clear call option
                  9.2.2     Release of a party by the call owner – Retain call option
        9.3     Release of a party from an existing multiparty call
                  9.3.1     Release of a party from an existing multiparty call requested by the call owner
                  9.3.2     Release of a party from an existing multiparty call requested by the party owner
10     Release of a call
       10.1     General rules for releasing a call
       10.2     Release of a call requested by the call owner
                 10.2.1     Release of a single-party call requested by the call owner
                 10.2.2     Release of a multiparty call requested by the call owner
       10.3     Release of a call requested by a non-call owner
                 10.3.1     Release of a two-party call requested by a non-call owner
                 10.3.2     Release of a multiparty call requested by a non-call owner