CONTENTS

 1     Scope
 2     References
 3     Definitions
 4     Abbreviations
 5     Description
        5.1     Modifiable connections
        5.2     Modification of a point-to-point connection
        5.3     Negotiation during modification
 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 and state definitions
        7.1     Primitive definitions
        7.2     State definitions
 8     Coding requirements
        8.1     Messages
                  8.1.1     MODIFY REQUEST
                  8.1.2     MODIFY ACKNOWLEDGEMENT
                  8.1.3     MODIFY REJECT
                  8.1.4     CONNECTION AVAILABLE
        8.2     Coding of specific message types and specific information element
                  8.2.1     Coding of specific message type
                  8.2.2     Coding of specific information elements
 9     Signalling procedures at the coincident SB and TB reference point
        9.1     Modification procedure at the requesting entity
                  9.1.1     Modification request
                  9.1.2     Modification acknowledgment
                  9.1.3     Indication of modification rejection
                  9.1.4     Response to STATUS messages while in the modify request state
                  9.1.5     No response to modification request
        9.2     Modification procedures at the responding entity
                  9.2.1     Modification indication
                  9.2.2     Modification acceptance
                  9.2.3     Modification confirmation
                  9.2.4     Modification rejection
        9.3     Transit entity conveyance of CONNECTION AVAILABLE messages
10     Procedures at the TB reference point for interworking with private B-ISDNs
11     Interworking with other networks
12     Interworking with supplementary services
13     Parameter values
14     Dynamic description SDLs
Appendix I – Example configuration of user and network behaviour during modification procedures
Appendix II – Guidelines for the use of the instruction indicator