RFC 3665 · BEST CURRENT PRACTICE · 2004
MON · 15 JUN 2026
Session Initiation Protocol Basic Call Flow Examples
Overview
RFC 3665, “Session Initiation Protocol Basic Call Flow Examples”, is a Best Current Practice document published in January 2004 by A. Johnston, S. Donovan, R. Sparks, C. Cunningham, K. Summers. The canonical text is published by the RFC Editor.
Abstract
This 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. Scenarios include SIP Registration and SIP session establishment. Call flow diagrams and message details are shown.
What “Best Current Practice” means
Documents the IETF community's recommended operational or procedural practice rather than a protocol specification.
Read this RFC
The canonical text of RFC 3665 is hosted at rfc-editor.org. Available in TXT,HTML.
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