Signalling Connection Control Part User Adaptation Layer (SUA)
RFC 3868

Network Working Group                                   J. Loughney, Ed.
Request for Comments: 3868                                         Nokia
Category: Standards Track                                  G. Sidebottom
                                                   Signatus Technologies
                                                                L. Coene
                                                              G. Verwimp
                                                            Siemens n.v.
                                                               J. Keller
                                                                 Tekelec
                                                             B. Bidulock
                                                     OpenSS7 Corporation
                                                            October 2004

    Signalling Connection Control Part User Adaptation Layer (SUA)

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   This document defines a protocol for the transport of any Signalling
   Connection Control Part-User signalling over IP using the Stream
   Control Transmission Protocol.  The protocol is designed to be
   modular and symmetric, to allow it to work in diverse architectures,
   such as a Signalling Gateway to IP Signalling Endpoint architecture
   as well as a peer-to-peer IP Signalling Endpoint architecture.

Loughney, et al.            Standards Track                     [Page 1]
RFC 3868                          SUA                       October 2004

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
       1.1.  Scope. . . . . . . . . . . . . . . . . . . . . . . . . .  3
       1.2.  Abbreviations and Terminology. . . . . . . . . . . . . .  4
       1.3.  Signalling Transport Architecture. . . . . . . . . . . .  6
       1.4.  Services Provided by the SUA Layer . . . . . . . . . . .  9
       1.5.  Internal Functions Provided in the SUA Layer . . . . . . 11
       1.6.  Definition of SUA Boundaries . . . . . . . . . . . . . . 14
   2.  Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . 19
   3.  Protocol Elements. . . . . . . . . . . . . . . . . . . . . . . 19
       3.1.  Common Message Header. . . . . . . . . . . . . . . . . . 20
       3.2.  SUA Connectionless Messages. . . . . . . . . . . . . . . 24
       3.3.  Connection Oriented Messages . . . . . . . . . . . . . . 27
       3.4.  Signalling Network Management (SNM) Messages . . . . . . 42
       3.5.  Application Server Process State Maintenance Messages. . 49
       3.6.  ASP Traffic Maintenance Messages . . . . . . . . . . . . 53
       3.7.  SUA Management Messages. . . . . . . . . . . . . . . . . 56
       3.8.  Routing Key Management (RKM) Messages. . . . . . . . . . 58
       3.9.  Common Parameters. . . . . . . . . . . . . . . . . . . . 61
       3.10. SUA-Specific parameters. . . . . . . . . . . . . . . . . 74
   4.  Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 92
       4.1.  Procedures to Support the SUA-User Layer . . . . . . . . 92
       4.2.  Receipt of Primitives from the Layer Management. . . . . 93
       4.3.  AS and ASP State Maintenance . . . . . . . . . . . . . . 95
       4.4.  Routing Key Management Procedures. . . . . . . . . . . .109
       4.5.  Availability and/or Congestion Status of SS7
             Destination Support101 . . . . . . . . . . . . . . . . .112
       4.6.  MTP3 Restart . . . . . . . . . . . . . . . . . . . . . .115
       4.7.  SCCP - SUA Interworking at the SG. . . . . . . . . . . .115
   5.  Examples of SUA Procedures . . . . . . . . . . . . . . . . . .117
       5.1.  SG Architecture. . . . . . . . . . . . . . . . . . . . .117
       5.2   IPSP Examples. . . . . . . . . . . . . . . . . . . . . .119
   6.  Security Considerations. . . . . . . . . . . . . . . . . . . .121
   7.  IANA Considerations. . . . . . . . . . . . . . . . . . . . . .121
       7.1.  SCTP Payload Protocol ID . . . . . . . . . . . . . . . .121
       7.2.  Port Number. . . . . . . . . . . . . . . . . . . . . . .121
       7.3.  Protocol Extensions. . . . . . . . . . . . . . . . . . .121
   8.  Timer Values . . . . . . . . . . . . . . . . . . . . . . . . .123
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .123
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . .123
       10.1. Normative References . . . . . . . . . . . . . . . . . .123