RFC 3372 (rfc3372) - Page 1 of 23
Session Initiation Protocol for Telephones (SIP-T): Context and Architectures
Alternative Format: Original Text Document
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
