CONTENTS

 1     Scope
 2     References
        2.1     Normative references
        2.2     Bibliography
 3     Definitions
 4     Abbreviations
 5     General framework of the AAL type 2 signalling protocol
        5.1     Interface between the AAL type 2 signalling entity and the AAL type 2 served user
                  5.1.1     Service provided by the AAL type 2 signalling entity
                  5.1.2     Primitives between AAL type 2 signalling entities and the AAL type 2 served user
                  5.1.3     Parameters between AAL type 2 signalling entities and the AAL type 2 served user
        5.2     Interface between the AAL type 2 signalling entity and the generic signalling transport
        5.3     Interface between the AAL type 2 signalling entity and layer management
 6     Forward and backward compatibility
 7     Format and coding of AAL type 2 signalling protocol
        7.1     Coding conventions for the AAL type 2 signalling protocol
        7.2     Format and coding of the AAL type 2 signalling protocol messages
                  7.2.1     AAL type 2 signalling protocol messages
                  7.2.2     Parameters of the AAL type 2 signalling protocol messages
        7.3     Parameter specification of the AAL type 2 signalling protocol messages
                 7.3.14     Path Type
                 7.3.15     Service Specific Information (Audio Extended)
                 7.3.16     Service Specific Information (Multirate Extended)
                 7.3.17     Preferred Service Specific Information (Audio Extended)
                 7.3.18     Preferred Service Specific Information (Multirate Extended)
                 7.3.19     Preferred Link Characteristics
                 7.3.20     Modify Support for Link Characteristics
                 7.3.21     Modify Support for Service Specific Information
                 7.3.22     Served User Correlation ID
        7.4     Field specification of the AAL type 2 signalling protocol parameters
                 7.4.19     Audio Extended service
                 7.4.20     Multirate Extended service
                 7.4.21     AAL type 2 Path QoS Codepoint
                 7.4.22     Served User Correlation ID value
 8     Procedure of the AAL type 2 signalling protocol
        8.1     Compatibility
        8.2     Nodal functions
                  8.2.1     Nodal functions for AAL type 2 nodes with served user interaction
                  8.2.2     Nodal functions for AAL type 2 nodes without served user interaction
        8.3     Protocol entity
                  8.3.1     General protocol error handling
                  8.3.2     Outgoing protocol procedures
                  8.3.3     Incoming protocol procedures
                  8.3.4     Maintenance protocol procedures
        8.4     List of timers
Annex A – Support for non-switched scenario
Annex B – Coding of the compatibility information
        B.1     Coding of the compatibility information for networks using Link Characteristics
                  B.1.1     Message compatibility
                  B.1.2     Parameter compatibility
        B.2     Coding of the compatibility information for networks not using link characteristics
                  B.2.1     Message compatibility
                  B.2.2     Parameter compatibility
Annex C – Handling of the Link Characteristics and SSCS Information in conjunction with the modification procedures
        C.1     Preferred Link Characteristics parameter present
        C.2     Preferred Link Characteristics parameter not present
        C.3     Handling of the Service Specific Information parameter
                  C.3.1     Handling SSCS Information parameters for Audio Service
                  C.3.2     Handling SSCS Information parameters for Multirate Service
Appendix I – Example message sequences
        I.6     Successful modification
        I.7     Unsuccessful modification
        I.8     Modification collision