ISDN Q.921-User Adaptation Layer
RFC 3057

Document Type RFC - Proposed Standard (February 2001; No errata)
Obsoleted by RFC 4233
Updated by RFC 3807
Last updated 2013-03-02
Stream IETF
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This information refers to IESG processing after the RFC was initially published:
IESG IESG state RFC 3057 (Proposed Standard)
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Network Working Group                                       K. Morneault
Request for Comments: 3057                                 Cisco Systems
Category: Standards Track                                   S. Rengasami
                                                                M. Kalla
                                                  Telcordia Technologies
                                                           G. Sidebottom
                                                         Nortel Networks
                                                           February 2001

                    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 (2001).  All Rights Reserved.

Abstract

   This document defines a protocol for backhauling of 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.

Morneault, et al.           Standards Track                     [Page 1]
RFC 3057            ISDN Q.921-User Adaptation Layer       February 2001

Table of Contents

   1.  Introduction.................................................  2
     1.1  Scope.....................................................  2
     1.2  Terminology...............................................  3
     1.3  IUA Overview..............................................  4
     1.4  Services Provided by the IUA Layer........................  9
     1.5  Functions Implemented by the IUA Layer.................... 12
     1.6  Definition of IUA Boundaries.............................. 14
   2.  Conventions.................................................. 16
   3.  Protocol Elements............................................ 17
     3.1  Common Message Header..................................... 17
     3.2  IUA Message Header........................................ 20
     3.3  Description of Messages................................... 22
   4.  Procedures................................................... 45
     4.1  Procedures to Support Service in Section 1.4.1............ 45
     4.2  Procedures to Support Service in Section 1.4.2............ 46
     4.3  Procedures to Support Service in Section 1.4.3............ 47
   5. Examples...................................................... 56
     5.1 Establishment of associations between SG and MGC examples.. 56
     5.2 ASP Traffic Fail-over Examples............................. 58
     5.3 Q.921/Q.931 primitives backhaul Examples................... 59
     5.4 Layer Management Communication Examples.................... 61
   6.  Security..................................................... 61
     6.1 Threats.................................................... 61
     6.2 Protecting Confidentiality ................................ 62
   7.  IANA Considerations.......................................... 62
     7.1 SCTP Payload Protocol Identifier........................... 62
     7.2 IUA Protocol Extensions.................................... 62
   8.  Acknowledgements............................................. 64
   9.  References................................................... 64
   10. Authors' Addresses........................................... 65
   11. Full Copyright Statement..................................... 66

1.  Introduction

   In this document, the term Q.921-User refers to an upper layer which
   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)
   layer protocol as well as how this protocol shall be implemented.

1.1 Scope

   There is a need for Switched Circuit Network (SCN) signaling protocol
   delivery from an ISDN Signaling Gateway (SG) to a Media Gateway
   Controller (MGC) as described in the Framework Architecture for

Morneault, et al.           Standards Track                     [Page 2]
RFC 3057            ISDN Q.921-User Adaptation Layer       February 2001

   Signaling Transport [4].  The delivery mechanism SHOULD meet the
   following criteria:

   *  Support for transport of the Q.921 / Q.931 boundary primitives
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