CONTENTS

 1     Scope
 2     References
 3     Definitions
 4     Abbreviations
 5     Description
        5.1     Overview
                  5.1.1     Introduction
                  5.1.2     Provision of addresses
        5.2     Protocol architecture
        5.3     Transport mechanisms
        5.4     Services provided by individual protocol entities
                  5.4.1     Services provided by ROSE
                  5.4.2     Services provided by GAT-control
                  5.4.3     Services provided by the transport mechanisms
 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
 8     Coding requirements
        8.1     Message functional definitions and content
        8.2     General message format and information element coding
 9    Signalling procedures
        9.1     Sending GAT-Control
                  9.1.1     Introduction
                  9.1.2     Sending a service user APDU as the initial APDU of a transaction
                  9.1.3     Responding to a service user APDU that has been received
        9.2     Receiving GAT-Control
                  9.2.1     Introduction
                  9.2.2     Receiving GAT-Control located at a terminal
                  9.2.3     Receiving GAT-Control located at a transit exchange, incoming local exchange, incoming gateway PINX, incoming gateway exchange, outgoing local exchange or outgoing gateway exchange
        9.3     Transit GAT-Control
        9.4     End GAT-Control
        9.5     Interpretation
                  9.5.1     Inclusion of an InterpretationAPDU parameter at a Source entity
                  9.5.2     Handling of APDUs at a Destination entity
10     Interactions with other networks
       10.1     Interworking with private ISDNs
       10.2     Interworking with non-ISDNs
       10.3     Interworking with frame-relay
       10.4     Interworking with PSPDNs
       10.5     Interworking with H.323 environments
11     Parameter values
Annex A - Redirection function
Appendix I - Examples of GAT protocol architectures
        I.1     Introduction
        I.2     Examples for use in narrow-band ISDN
        I.3     Examples for use in broadband ISDN
        I.4     Key to figures within this appendix
        I.5     Bibliography for figures within this appendix
Appendix II - General information for the definition of GAT user applications
       II.1     Introduction
       II.2     ROSE
       II.3     Service indicator
       II.4     Addressing mechanisms
                 II.4.1     Transport mechanism addresses
                 II.4.2     GAT addresses
                 II.4.3     Application addresses
       II.5     Other application data issues
Appendix III - Assignment of object identifiers