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This draft is a work item of the Session Initiation Proposal Investigation Working Group of the IETF.
Title : Session Initiation Protocol PSTN Call Flows
Author(s) : C. Cunningham, A. Johnston
Filename : draft-ietf-sipping-pstn-call-flows-01.txt
Pages : 117
Date : 2002-11-7
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.
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