RFC 3398 (rfc3398) - Page 1 of 68

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

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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
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