Session Initiation Protocol Call Flow Examples

Document Type Expired Internet-Draft (sipping WG)
Authors Chris Cunningham  , Jonathan Rosenberg  , Steve Donovan  , Alan Johnston  , Henning Schulzrinne  , Robert Sparks  , Kevin Summers  , Dean Willis 
Last updated 2002-08-01
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This informational document gives examples of Session Initiation Protocol (SIP) call flows. Elements in these call flows include SIP User Agents and Clients, SIP Proxy and Redirect Servers, and Gateways to the PSTN (Public Switch Telephone Network). Scenarios include SIP Registration, SIP to SIP calling, SIP to Gateway, Gateway to SIP, and Gateway to Gateway via SIP. Call flow diagrams and message details are shown. PSTN telephony protocols are illustrated using ISDN (Integrated Services Digital Network), ANSI 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). Example SIP messages used for testing during SIP interoperability test events include SIP 'torture test' messages, and messages with invalid parameters, methods, and tags.


Chris Cunningham (
Jonathan Rosenberg (
Steve Donovan (
Alan Johnston (
Henning Schulzrinne (
Robert Sparks (
Kevin Summers (
Dean Willis (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)