BCP 119

RFC 4579

Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents, August 2006

Canonical URL:
https://www.rfc-editor.org/bcp/bcp119.txt
File formats:
Plain TextPDF
Status:
BEST CURRENT PRACTICE
Authors:
A. Johnston
O. Levin
Stream:
IETF
Source:
sipping (rai)

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Abstract

This specification defines conferencing call control features for the Session Initiation Protocol (SIP). This document builds on the Conferencing Requirements and Framework documents to define how a tightly coupled SIP conference works. The approach is explored from the perspective of different user agent (UA) types: conference-unaware, conference-aware, and focus UAs. The use of Uniform Resource Identifiers (URIs) in conferencing, OPTIONS for capabilities discovery, and call control using REFER are covered in detail with example call flow diagrams. The usage of the isfocus feature tag is defined. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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