CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
 4     Abbreviations and acronyms
 5     Description
 6     Messages and information elements
 7     Actions at the transferring endpoint (user A)
        7.1     Normal procedures if only the primary call exists
        7.2     Normal procedures if also the secondary call exists
        7.3     Exceptional procedures
 8     Actions at the transferred endpoint (user B)
        8.1     Normal procedures
        8.2     Exceptional procedures
 9     Actions at the transferred-to endpoint (user C)
        9.1     Normal procedures
        9.2     Exceptional procedures
10     Additional procedures
       10.1     Interworking with non-H.323 terminals
       10.2     Hold and consultation
       10.3     Transfer without rerouting (i.e. transfer by join)
       10.4     Further actions at transferred and transferred-to endpoints
       10.5     Interactions with H.323 Ad Hoc Conference
       10.6     Gatekeeper actions
                 10.6.1     Call transfer performed by gatekeeper
11     Dynamic description of transfer with rerouting
       11.1     Transfer with rerouting without secondary call
                 11.1.1     Operational model for Transfer if no gatekeeper is involved in the service
                 11.1.2     Operational model for transfer using gatekeeper routed model
       11.2     Transfer with secondary call
                 11.2.1     Operational model for transfer if no gatekeeper is involved in the service
                 11.2.2     Operational model for transfer using gatekeeper routed model
       11.3     Communication between transferring signalling entity TRGSE and TRGSE user
                 11.3.1     Table of primitives
                 11.3.2     Primitive definition
                 11.3.3     Parameter definition
                 11.3.4     States
       11.4     Communication between transferred signalling entity TRDSE and TRDSE user
                 11.4.1     Table of primitives
                 11.4.2     Primitive definition
                 11.4.3     Parameter definition
                 11.4.4     States
       11.5     Communication between transferred-to signalling entity TRTSE and TRTSE user
                 11.5.1     Table of primitives
                 11.5.2     Primitive definition
                 11.5.3     Parameter definition
                 11.5.4     States
       11.6     Peer-to-peer communication for transfer with rerouting
                 11.6.1     Messages
                 11.6.2     Timers
                 11.6.3     Counters
                 11.6.4     Message flow examples
12     Operations in support of SS-CT
13     Specification and Description Language (SDL) diagrams
       13.1     Call Transfer block diagram
       13.2     Call transfer substructure diagram
       13.3     Transferring signalling entity SDLs
       13.4     Transferred signalling entity SDLs
       13.5     Transferred-to signalling entity SDLs