CONTENTS

 1     Scope
 2     References
 3     Definitions
 4     Abbreviations
 5     Description
        5.1     Application to interface structure
        5.2     Capabilities supported by this Recommendation
 6     Operational requirements
        6.1     Provision and withdrawal
        6.2     Requirements on the originating network side
        6.3     Requirements on the destination network side
 7     Primitive definitions and state definitions
        7.1     Primitive definitions
        7.2     State definitions
                  7.2.1     Call states
                  7.2.2     Bearer states
 8     Coding requirements
        8.1     Messages for separated call control
                  8.1.1     ALERTING
                  8.1.2     CALL PROCEEDING
                  8.1.3     CONNECT
                  8.1.4     CONNECT ACKNOWLEDGE
                  8.1.5     RELEASE
                  8.1.6     RELEASE COMPLETE
                  8.1.7     CALL SETUP
                  8.1.8     STATUS
                  8.1.9     STATUS ENQUIRY
                 8.1.10     NOTIFY
        8.2     Information elements
                  8.2.1     Message type
                  8.2.2     Call identifier
                  8.2.3     Call capability
 9     Signalling procedures at the coincident S_B and T_B reference point
        9.1     Establishment of a separated call at the originating interface
                  9.1.1     Call request
                  9.1.2     Invalid call control information
                  9.1.3     Call proceeding
                  9.1.4     Call confirmation indication
                  9.1.5     Call acceptance
                  9.1.6     Call rejection
        9.2     Call establishment at the destination interface
                  9.2.1     Incoming call request
                  9.2.2     Call confirmation
                  9.2.3     Call acceptance
                  9.2.4     Active indication
        9.3     Call clearing
                  9.3.1     Exception conditions
                  9.3.2     Call clearing initiated by the user
                  9.3.3     Clearing initiated by the network
                  9.3.4     Call clearing collision
                  9.3.5     Interaction between call control and bearer control
        9.4     Restart procedures
        9.5     Handling of error conditions
        9.6     Error procedures with explicit action indication
        9.7     Notification procedures
10     Signalling procedures at the T_B reference point
11     Interworking with other networks
12     Interactions with supplementary services
13     Parameter values
14     Dynamic description SDLs
Annex A – Additional procedures for pre-negotiation (Optional)
Appendix I – Additional procedures for simultaneous establishment of the first bearer with the call
        I.1     State definitions
        I.2     Coding requirements
                  I.2.1     Messages
        I.3     Procedures
                  I.3.1     Simultaneous call and bearer establishment
                  I.3.2     First bearer clearing
                  I.3.3     Call clearing
Appendix II – Protocol model and related entities
       II.1     Field of application
       II.2     Call and Bearer control protocols in the DSS2 architecture
       II.3     Object identifiers
Appendix III – Guidelines for the use of the instruction indicator
Appendix IV – Examples of message flows for separated call and bearer control