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Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows (RFC3666)

IP.com Disclosure Number: IPCOM000021131D
Original Publication Date: 2003-Dec-01
Included in the Prior Art Database: 2003-Dec-25

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Johnston: AUTHOR [+5]

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.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 3% of the total text.

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 [Page 1]

RFC 3666 SIP PSTN Call Flows December 2003

Table of Contents

1. Overview..................................................... 2

1.1. General Assumptions.................................... 3

1.2. Legend for Message Flows............................... 4

1.3. SIP Protocol Assumptions............................... 5

2. SIP to PSTN Dialing.......................................... 6

2.1. Successful SIP to ISUP PSTN call....................... 7

2.2. Successful SIP to ISDN PBX call........................ 15

2.3. Successful SIP to ISUP PSTN call with overflow......... 23

2.4. Session established using ENUM Query................... 32

2.5. Unsuccessful SIP to PSTN call: Treatment from PSTN..... 38

2.6. Unsuccessful SIP to PSTN: REL w/Cause from PSTN........ 45

2.7. Unsuccessful SIP to PSTN: ANM Timeout.................. 49

3. PSTN to SIP Dialing.......................................... 54

3.1. Successful PSTN to SIP call............................ 55

3.2. Successful PSTN to SIP call, Fast Answer............... 62

3.3. Successful PBX to SIP call............................. 68

3.4. Unsuccessful PSTN to SIP REL, SIP error mapped to REL.. 74

3.5. Unsuccessful PSTN to SIP REL, SIP busy mapped to REL... 76

3.6. Unsuccessful PSTN->SIP, SIP error interworking to tones 80

3.7. Unsuccessful PSTN->SIP, ACM timeout.................... 84

3.8. Unsuccessful PSTN->SIP, ACM timeout, stateless Proxy... 88

3.9. Unsuccessful PSTN->SIP, Caller Abandonment............. 91

4. PSTN to PSTN Dialing via SIP Network......................... 96

4.1. Successful ISUP PSTN to ISUP PSTN call................. 97

4.2. Successful FGB PBX to ISDN PBX call with overflow...... 105

5. Security Con...