Integrated Services Digital Network (ISDN) User Part (ISUP) to Session Initiation Protocol (SIP) Mapping
RFC 3398

Document Type RFC - Proposed Standard (December 2002; Errata)
Last updated 2015-10-14
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IESG IESG state RFC 3398 (Proposed Standard)
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Network Working Group                                       G. Camarillo
Request for Comments: 3398                                      Ericsson
Category: Standards Track                                    A. B. Roach
                                                             dynamicsoft
                                                             J. Peterson
                                                                 NeuStar
                                                                  L. Ong
                                                                   Ciena
                                                           December 2002

      Integrated Services Digital Network (ISDN) User Part (ISUP)
              to Session Initiation Protocol (SIP) Mapping

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 (2002).  All Rights Reserved.

Abstract

   This document describes a way to perform the mapping between two
   signaling protocols: the Session Initiation Protocol (SIP) and the
   Integrated Services Digital Network (ISDN) User Part (ISUP) of
   Signaling System No. 7 (SS7).  This mechanism might be implemented
   when using SIP in an environment where part of the call involves
   interworking with the Public Switched Telephone Network (PSTN).

Table of Contents

   1.      Introduction............................................  3
   2.      Scope...................................................  4
   3.      Terminology.............................................  5
   4.      Scenarios...............................................  5
   5.      SIP Mechanisms Required.................................  7
   5.1     'Transparent' Transit of ISUP Messages..................  7
   5.2     Understanding MIME Multipart Bodies.....................  7
   5.3     Transmission of DTMF Information........................  8
   5.4     Reliable Transmission of Provisional Responses..........  8
   5.5     Early Media.............................................  8
   5.6     Mid-Call Transactions which do not change SIP state.....  9

Camarillo, et. al.          Standards Track                     [Page 1]
RFC 3398                  ISUP to SIP Mapping              December 2002

   5.7     Privacy Protection......................................  9
   5.8     CANCEL causes........................................... 10
   6.      Mapping................................................. 10
   7.      SIP to ISUP Mapping..................................... 11
   7.1     SIP to ISUP Call flows.................................. 11
   7.1.1   En-bloc Call Setup (no auto-answer)..................... 11
   7.1.2   Auto-answer call setup.................................. 12
   7.1.3   ISUP T7 Expires......................................... 13
   7.1.4   SIP Timeout............................................. 14
   7.1.5   ISUP Setup Failure...................................... 15
   7.1.6   Cause Present in ACM Message............................ 16
   7.1.7   Call Canceled by SIP.................................... 17
   7.2     State Machine........................................... 18
   7.2.1   INVITE received......................................... 19
   7.2.1.1 INVITE to IAM procedures................................ 19
   7.2.2   ISUP T7 expires......................................... 23
   7.2.3   CANCEL or BYE received.................................. 23
   7.2.4   REL received............................................ 24
   7.2.4.1 ISDN Cause Code to Status Code Mapping.................. 24
   7.2.5   Early ACM received...................................... 27
   7.2.6   ACM received............................................ 27
   7.2.7   CON or ANM Received..................................... 28
   7.2.8   Timer T9 Expires........................................ 29
   7.2.9   CPG Received............................................ 29
   7.3     ACK received............................................ 30
   8.      ISUP to SIP Mapping..................................... 30
   8.1     ISUP to SIP Call Flows.................................. 30
   8.1.1   En-bloc call setup (non auto-answer).................... 31
   8.1.2   Auto-answer call setup.................................. 32
   8.1.3   SIP Timeout............................................. 33
   8.1.4   ISUP T9 Expires......................................... 34
   8.1.5   SIP Error Response...................................... 35
   8.1.6   SIP Redirection......................................... 36
   8.1.7   Call Canceled by ISUP................................... 37
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