1     Introduction
        1.1     General characteristics of signalling connection control procedures
                  1.1.1     Purpose
                  1.1.2     Protocol classes
                  1.1.3     Signalling connections
                  1.1.4     Compatibility and handling of unrecognized information
        1.2     Overview of procedures for connection-oriented services
                  1.2.1     Connection establishment
                  1.2.2     Data transfer
                  1.2.3     Connection release
        1.3     Overview of procedures for connectionless services
                  1.3.1     General
                  1.3.2     Segmentation/reassembly
        1.4     Structure of the SCCP and contents of this Recommendation
 2     Addressing and routing
        2.1     SCCP addressing principles
        2.2     SCCP routing principles
                  2.2.1     Receipt of SCCP message transferred by the MTP
                  2.2.2     Messages passed from connection-oriented or connectionless control to SCCP routing control
        2.3     SCCP routing procedures
                  2.3.1     Receipt of SCCP messages transferred by the MTP
                  2.3.2     Messages from connectionless or connection-oriented control to SCCP routing control
        2.4     Global title translation
                  2.4.1     General characteristics of the GTT
                  2.4.2     Terminology definitions
                  2.4.3     Input of the GTT function
                  2.4.4     Output of the GTT function
                  2.4.5     Global title translation function
        2.5     Compatibility test
        2.6     Traffic limitation mechanism
                  2.6.1     General
                  2.6.2     Importance of a message
                  2.6.3     Handling of messages to a congested node
        2.7     Calling party address treatment
                  2.7.1     Address indicator
                  2.7.2     Calling party address in the international network
                  2.7.3     Routing indicator
                  2.7.4     Screening
                  2.7.5     Inclusion of OPC in the calling party address
        2.8     Routing failures
                  2.8.1     No translation for an address of such nature
                  2.8.2     No translation for this specific address
                  2.8.3     MTP/SCCP/subsystem failure
                  2.8.4     MTP/SCCP/subsystem congestion
                  2.8.5     Unequipped user
                  2.8.6     Hop counter violation
 3     Connection-oriented procedures
        3.1     Connection establishment
                  3.1.1     General
                  3.1.2     Local reference numbers
                  3.1.3     Negotiation procedures
                  3.1.4     Actions at the originating node
                  3.1.5     Actions at a relay node with coupling
                  3.1.6     Actions at the destination node
        3.2     Connection refusal
                  3.2.1     Actions at node initiating connection refusal
                  3.2.2     Actions at a relay node not initiating connection refusal
                  3.2.3     Actions at the originating node not initiating connection refusal
        3.3     Connection release
                  3.3.1     General
                  3.3.2     Frozen reference
                  3.3.3     Actions at an end node initiating connection release
                  3.3.4     Actions at a relay node
                  3.3.5     Actions at an end node not initiating connection release
        3.4     Inactivity control
        3.5     Data transfer
                  3.5.1     General
                  3.5.2     Flow control
                  3.5.3     Segmenting and reassembly
        3.6     Expedited data transfer
                  3.6.1     General
                  3.6.2     Actions at the originating node
                  3.6.3     Actions at a relay node
                  3.6.4     Actions at the destination node
        3.7     Reset
                  3.7.1     General
                  3.7.2     Action at an end node initiating the reset procedure
                  3.7.3     Actions at a relay node
                  3.7.4     Actions at an end node not initiating the reset procedure
                  3.7.5     Handling of messages during the reset procedures
        3.8     Restart
                  3.8.1     General
                  3.8.2     Actions at the recovered node
                  3.8.3     Actions at the non‑failed far end node
                  3.8.4     Syntax error
                  3.8.5     Action tables
                  3.8.6     Actions upon the reception of an ERR message
 4     Connectionless procedures
        4.1     Data transfer
                  4.1.1     Segmentation/reassembly
                  4.1.2     Messagechange
        4.2     Message return procedure
        4.3     Syntax error
 5     SCCP management procedures
        5.1     General
        5.2     Signalling point status management
                  5.2.1     General
                  5.2.2     Signalling point prohibited
                  5.2.3     Signalling point allowed
                  5.2.4     Signalling point congested
                  5.2.5     Local MTP network availability
                  5.2.6     Local MTP network unavailability
                  5.2.7     SCCP reports of SCCP and nodal congestion
                  5.2.8     Inter- and Intra- SCMG congestion reports procedure
        5.3     Subsystem status management
                  5.3.1     General
                  5.3.2     Subsystem prohibited
                  5.3.3     Subsystem allowed
                  5.3.4     Subsystem status test
                  5.3.5     Coordinated state change
                  5.3.6     Local broadcast
                  5.3.7     Broadcast
        5.4     MTP/SCMG restart
 6     References
        6.1     Normative references
        6.2     Informative references
Annex A – State diagrams for the signalling connection control part of Signalling System No. 7
        A.1     Introduction
        A.2     Symbol definition of the state diagrams at the message interface
        A.3     Symbol definition of the state diagrams
Annex B – Action tables for the SCOC
        B.1     Introduction
        B.2     Symbol definition of the action tables
        B.3     Table of contents
Annex C – State Transition Diagrams (STD) for the signalling connection  control part of Signalling System No. 7
        C.1     General
        C.2     Drafting conventions
        C.3     Figures
        C.4     Abbreviations and timers
Annex D – State transition diagrams (STD) for SCCP management control
        D.1     General
        D.2     Drafting conventions
        D.3     Figures
        D.4     Abbreviations and timers