A Session Initiation Protocol (SIP) Event Package for Conference State
RFC 4575

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Network Working Group                                       J. Rosenberg
Request for Comments: 4575                                 Cisco Systems
Category: Standards Track                                 H. Schulzrinne
                                                     Columbia University
                                                           O. Levin, Ed.
                                                   Microsoft Corporation
                                                             August 2006

                  A Session Initiation Protocol (SIP)
                   Event Package for Conference State

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document defines a conference event package for tightly coupled
   conferences using the Session Initiation Protocol (SIP) events
   framework, along with a data format used in notifications for this
   package.  The conference package allows users to subscribe to a
   conference Uniform Resource Identifier (URI).  Notifications are sent
   about changes in the membership of this conference and optionally
   about changes in the state of additional conference components.

Rosenberg, et al.           Standards Track                     [Page 1]
RFC 4575                   Conference Package                August 2006

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................4
   3. Conference Event Package ........................................4
      3.1. Event Package Name .........................................5
      3.2. Filtering ..................................................5
      3.3. Subscription Duration ......................................5
      3.4. NOTIFY Bodies ..............................................5
      3.5. Notifier Processing of SUBSCRIBE Requests ..................6
      3.6. Notifier Generation of NOTIFY Requests .....................6
      3.7. Subscriber Processing of NOTIFY Requests ...................6
      3.8. Handling of Forked Requests ................................7
      3.9. Rate of Notifications ......................................7
      3.10. State Agents ..............................................7
   4. Conference Document .............................................7
      4.1. Format .....................................................7
      4.2. Namespace ..................................................7
      4.3. Versioning .................................................8
      4.4. Partial Notifications Mechanism ............................8
      4.5. Element Keys ...............................................9
      4.6. Constructing Coherent State Procedure ......................9
   5. Conference Data ................................................11
      5.1. Overview ..................................................11
      5.2. <conference-info> .........................................13
      5.3. <conference-description> ..................................14
           5.3.1. <conf-uris> ........................................14
           5.3.2. <service-uris> .....................................15
           5.3.3. <maximum-user-count> ...............................16
           5.3.4. <available-media> ..................................16
      5.4. <host-info> ...............................................17
           5.4.1. <display-text> .....................................17
           5.4.2. <web-page> .........................................17
           5.4.3. <uris> .............................................17
      5.5. <conference-state> ........................................17
           5.5.1. <user-count> .......................................17
           5.5.2. <active> ...........................................18
           5.5.3. <locked> ...........................................18
      5.6. <users> and Its <user> Sub-elements .......................18
           5.6.1. <display-text> .....................................19
           5.6.2. <associated-aors> ..................................19
           5.6.3. <roles> ............................................19
           5.6.4. <languages> ........................................19
           5.6.5. <cascaded-focus> ...................................19
           5.6.6. <endpoint> .........................................20
      5.7. <endpoint> ................................................20
           5.7.1. <display-text> .....................................20