RFC 3666 (rfc3666) - Page 1 of 118

Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows

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Network Working Group                                        A. Johnston
Request for Comments: 3666                                           MCI
BCP: 76                                                       S. Donovan
Category: Best Current Practice                                R. Sparks
                                                           C. Cunningham
                                                             dynamicsoft
                                                              K. Summers
                                                                   Sonus
                                                           December 2003


                   Session Initiation Protocol (SIP)
          Public Switched Telephone Network (PSTN) Call Flows

Status of this Memo

   This document specifies an Internet Best Current Practices for the
   Internet Community, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This document contains best current practice examples of Session
   Initiation Protocol (SIP) call flows showing interworking with the
   Public Switched Telephone Network (PSTN).  Elements in these call
   flows include SIP User Agents, SIP Proxy Servers, and PSTN Gateways.
   Scenarios include SIP to PSTN, PSTN to SIP, and PSTN to PSTN via SIP.
   PSTN telephony protocols are illustrated using ISDN (Integrated
   Services Digital Network), ISUP (ISDN User Part), and FGB (Feature
   Group B) circuit associated signaling.  PSTN calls are illustrated
   using global telephone numbers from the PSTN and private extensions
   served on by a PBX (Private Branch Exchange).  Call flow diagrams and
   message details are shown.














Johnston, et al.         Best Current Practice
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