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Integrated Services Digital Network (ISDN) Q.921-User Adaptation Layer
RFC 4233

Document type: RFC - Proposed Standard (January 2006; No errata)
Updated by RFC 5133
Obsoletes RFC 3057
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4233 (Proposed Standard)
Responsible AD: Jon Peterson
Send notices to: <lyong@ciena.com>

Network Working Group                                       K. Morneault
Request for Comments: 4233                                 Cisco Systems
Obsoletes: 3057                                             S. Rengasami
Category: Standards Track                                   Tridea Works
                                                                M. Kalla
                                                  Telcordia Technologies
                                                           G. Sidebottom
                                                   Signatus Technologies
                                                            January 2006

               Integrated Services Digital Network (ISDN)
                      Q.921-User Adaptation Layer

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 (2006).

Abstract

   This document defines a protocol for backhauling of Integrated
   Services Digital Network (ISDN) Q.921 User messages over IP using the
   Stream Control Transmission Protocol (SCTP).  This protocol would be
   used between a Signaling Gateway (SG) and Media Gateway Controller
   (MGC).  It is assumed that the SG receives ISDN signaling over a
   standard ISDN interface.

   This document obsoletes RFC 3057.

Morneault, et al.           Standards Track                     [Page 1]
RFC 4233            ISDN Q.921-User Adaptation Layer        January 2006

Table of Contents

   1. Introduction ....................................................3
      1.1. Scope ......................................................3
      1.2. Terminology ................................................3
      1.3. IUA Overview ...............................................5
      1.4. Services Provided by the IUA Layer .........................7
      1.5. Functions Implemented by the IUA Layer ....................10
      1.6. Definition of IUA Boundaries ..............................12
   2. Conventions ....................................................15
   3. Protocol Elements ..............................................15
      3.1. Common Message Header .....................................15
      3.2. IUA Message Header ........................................19
      3.3. IUA Messages ..............................................21
   4. Procedures .....................................................46
      4.1. Procedures to Support Service in Section 1.4.1 ............46
      4.2. Procedures to Support Service in Section 1.4.2 ............46
      4.3. Procedures to Support Service in Section 1.4.3 ............48
   5. Examples .......................................................58
      5.1. Establishment of Association and Traffic between
           SGs and ASPs ..............................................58
      5.2. ASP Traffic Fail-over Examples ............................62
      5.3. Q.921/Q.931 Primitives Backhaul Examples ..................63
      5.4. Layer Management Communication Examples ...................64
   6. Security .......................................................65
   7. IANA Considerations ............................................65
      7.1. SCTP Payload Protocol Identifier ..........................65
      7.2. IUA Protocol Extensions ...................................65
   8. Timer Values ...................................................67
   9. Acknowledgements ...............................................67
   10. References ....................................................67
      10.1. Normative References .....................................67
      10.2. Informative References ...................................67
   11. Change Log ....................................................68
   Appendix A ........................................................69
      A.1. Signaling Network Architecture ............................69
      A.2. Application Server Process Redundancy .....................70

Morneault, et al.           Standards Track                     [Page 2]
RFC 4233            ISDN Q.921-User Adaptation Layer        January 2006

1.  Introduction

   In this document, the term Q.921-User refers to an upper layer that
   uses the services of Q.921, not the user side of ISDN interface [1].
   Examples of the upper layer would be Q.931 and QSIG.

   This section describes the need for ISDN Q.921-User Adaptation (IUA)

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