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Session Initiation Protocol for Telephones (SIP-T): (SIP-T): Context and Architectures (RFC3372)

IP.com Disclosure Number: IPCOM000009753D
Original Publication Date: 2002-Sep-01
Included in the Prior Art Database: 2002-Sep-17
Document File: 24 page(s) / 50K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Vemuri: AUTHOR [+2]

Abstract

The popularity of gateways that interwork between the PSTN (Public Switched Telephone Network) and SIP networks has motivated the publication of a set of common practices that can assure consistent behavior across implementations. This document taxonomizes the uses of PSTN-SIP gateways, provides uses cases, and identifies mechanisms necessary for interworking. The mechanisms detail how SIP provides for both 'encapsulation' (bridging the PSTN signaling across a SIP network) and 'translation' (gatewaying).

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Network Working Group                                          A. Vemuri

Request for Comments: 3372                          Qwest Communications

BCP: 63                                                      J. Peterson

Category: Best Current Practice                                  NeuStar

                                                          September 2002

          Session Initiation Protocol for Telephones (SIP-T):

                       Context and Architectures

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 (2002).  All Rights Reserved.

Abstract

   The popularity of gateways that interwork between the PSTN (Public

   Switched Telephone Network) and SIP networks has motivated the

   publication of a set of common practices that can assure consistent

   behavior across implementations.  This document taxonomizes the uses

   of PSTN-SIP gateways, provides uses cases, and identifies mechanisms

   necessary for interworking.  The mechanisms detail how SIP provides

   for both 'encapsulation' (bridging the PSTN signaling across a SIP

   network) and 'translation' (gatewaying).

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2

   2.  SIP-T for ISUP-SIP Interconnections  . . . . . . . . . . . . .  4

   3.  SIP-T Flows  . . . . . . . . . . . . . . . . . . . . . . . . .  7

   3.1 SIP Bridging (PSTN - IP - PSTN)  . . . . . . . . . . . . . . .  8

   3.2 PSTN origination - IP termination  . . . . . . . . . . . . . .  9

   3.3 IP origination - PSTN termination  . . . . . . . . . . . . . . 11

   4.  SIP-T Roles and Behavior . . . . . . . . . . . . . . . . . . . 12

   4.1 Originator . . . . . . . . . . . . . . . . . . . . . . . . . . 12

   4.2 Terminator . . . . . . . . . . . . . . . . . . . . . . . . . . 13

   4.3 Intermediary . . . . . . . . . . . . . . . . . . . . . . . . . 14

   4.4 Behavioral Requirements Summary  . . . . . . . . . . . . . . . 15

   5.  Components of the SIP-T Protocol . . . . . . . . . . . . . . . 16

   5.1 Core SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

   5.2 Encapsulation  . . . . . . . . . . . . . . . . . . . . . . . . 16

   5.3 Translation  . . . . . . . . . . . . . . . . . . . . . . . . . 16

Vemuri & Peterson        Best Current Practice                  [Page 1]

RFC 3372                         SIP-T                    September 2002

   5.4 Support for mid-call signaling . . . . . . . . . . . . . . . . 17

   6.  SIP Content...