A Call Control and Multi-Party Usage Framework for the Session Initiation Protocol (SIP)
RFC 5850
Internet Engineering Task Force (IETF) R. Mahy
Request for Comments: 5850 Unaffiliated
Category: Informational R. Sparks
ISSN: 2070-1721 Tekelec
J. Rosenberg
jdrosen.net
D. Petrie
SIPez
A. Johnston, Ed.
Avaya
May 2010
A Call Control and Multi-Party Usage Framework for
the Session Initiation Protocol (SIP)
Abstract
This document defines a framework and the requirements for call
control and multi-party usage of the Session Initiation Protocol
(SIP). To enable discussion of multi-party features and
applications, we define an abstract call model for describing the
media relationships required by many of these. The model and actions
described here are specifically chosen to be independent of the SIP
signaling and/or mixing approach chosen to actually set up the media
relationships. In addition to its dialog manipulation aspect, this
framework includes requirements for communicating related information
and events such as conference and session state and session history.
This framework also describes other goals that embody the spirit of
SIP applications as used on the Internet such as the definition of
primitives (not services), invoker and participant oriented
primitives, signaling and mixing model independence, and others.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5850.
Mahy, et al. Informational [Page 1]
RFC 5850 SIP Call Control Framework May 2010
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Table of Contents
1. Motivation and Background . . . . . . . . . . . . . . . . . . 4
2. Key Concepts . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1. Conversation Space Model . . . . . . . . . . . . . . . . . 7
2.2. Relationship between Conversation Space, SIP Dialogs,
and SIP Sessions . . . . . . . . . . . . . . . . . . . . . 8
2.3. Signaling Models . . . . . . . . . . . . . . . . . . . . . 9
2.4. Mixing Models . . . . . . . . . . . . . . . . . . . . . . 10
2.4.1. Tightly Coupled . . . . . . . . . . . . . . . . . . . 11
2.4.2. Loosely Coupled . . . . . . . . . . . . . . . . . . . 12
2.5. Conveying Information and Events . . . . . . . . . . . . . 13
2.6. Componentization and Decomposition . . . . . . . . . . . . 15
2.6.1. Media Intermediaries . . . . . . . . . . . . . . . . . 15
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