A Framework for Centralized Conferencing
RFC 5239

 
Document
Type RFC - Proposed Standard (June 2008; Errata)
Last updated 2013-03-02
Replaces draft-barnes-xcon-framework
Stream IETF
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WG state (None)
Consensus Unknown
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IESG
IESG state RFC 5239 (Proposed Standard)
Telechat date
Responsible AD Cullen Jennings
IESG note Adam Roach is proto shepherd
Send notices to adam@nostrum.com, alan.johnston@mci.com, draft-ietf-xcon-framework@ietf.org

Email authors IPR References Referenced by Nits Search lists

Network Working Group                                          M. Barnes
Request for Comments: 5239                                        Nortel
Category: Standards Track                                     C. Boulton
                                                                   Avaya
                                                                O. Levin
                                                   Microsoft Corporation
                                                               June 2008

                A Framework for Centralized Conferencing

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.

Abstract

   This document defines the framework for Centralized Conferencing.
   The framework allows participants using various call signaling
   protocols, such as SIP, H.323, Jabber, Q.931 or ISDN User Part
   (ISUP), to exchange media in a centralized unicast conference.  The
   Centralized Conferencing Framework defines logical entities and
   naming conventions.  The framework also outlines a set of
   conferencing protocols, which are complementary to the call signaling
   protocols, for building advanced conferencing applications.  The
   framework binds all the defined components together for the benefit
   of builders of conferencing systems.

Barnes, et al.              Standards Track                     [Page 1]
RFC 5239           Centralized Conferencing Framework          June 2008

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   5.  Centralized Conferencing Data  . . . . . . . . . . . . . . . . 10
     5.1.  Conference Information . . . . . . . . . . . . . . . . . . 11
     5.2.  Conference policies  . . . . . . . . . . . . . . . . . . . 12
   6.  Centralized Conferencing Constructs and Identifiers  . . . . . 12
     6.1.  Conference Identifier  . . . . . . . . . . . . . . . . . . 13
     6.2.  Conference Object  . . . . . . . . . . . . . . . . . . . . 13
       6.2.1.  Conference Object Identifier . . . . . . . . . . . . . 15
     6.3.  Conference User Identifier . . . . . . . . . . . . . . . . 16
   7.  Conferencing System Realization  . . . . . . . . . . . . . . . 17
     7.1.  Cloning Tree . . . . . . . . . . . . . . . . . . . . . . . 17
     7.2.  Ad Hoc Example . . . . . . . . . . . . . . . . . . . . . . 20
     7.3.  Advanced Example . . . . . . . . . . . . . . . . . . . . . 21
     7.4.  Scheduling a Conference  . . . . . . . . . . . . . . . . . 23
   8.  Conferencing Mechanisms  . . . . . . . . . . . . . . . . . . . 26
     8.1.  Call Signaling . . . . . . . . . . . . . . . . . . . . . . 26
     8.2.  Notifications  . . . . . . . . . . . . . . . . . . . . . . 26
     8.3.  Conference Control Protocol  . . . . . . . . . . . . . . . 26
     8.4.  Floor Control  . . . . . . . . . . . . . . . . . . . . . . 26
   9.  Conferencing Scenario Realizations . . . . . . . . . . . . . . 28
     9.1.  Conference Creation  . . . . . . . . . . . . . . . . . . . 28
     9.2.  Participant Manipulations  . . . . . . . . . . . . . . . . 30
     9.3.  Media Manipulations  . . . . . . . . . . . . . . . . . . . 32
     9.4.  Sidebar Manipulations  . . . . . . . . . . . . . . . . . . 33
       9.4.1.  Internal Sidebar . . . . . . . . . . . . . . . . . . . 35
       9.4.2.  External Sidebar . . . . . . . . . . . . . . . . . . . 37
     9.5.  Floor Control Using Sidebars . . . . . . . . . . . . . . . 40
     9.6.  Whispering or Private Messages . . . . . . . . . . . . . . 42
     9.7.  Conference Announcements and Recordings  . . . . . . . . . 44
     9.8.  Monitoring for DTMF  . . . . . . . . . . . . . . . . . . . 46
     9.9.  Observing and Coaching . . . . . . . . . . . . . . . . . . 46
   10. Relationships between SIP and Centralized Conferencing
       Frameworks . . . . . . . . . . . . . . . . . . . . . . . . . . 49
   11. Security Considerations  . . . . . . . . . . . . . . . . . . . 50
     11.1. User Authentication and Authorization  . . . . . . . . . . 51
     11.2. Security and Privacy of Identity . . . . . . . . . . . . . 53
     11.3. Floor Control Server Authentication  . . . . . . . . . . . 53
   12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 53
   13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 54
     13.1. Normative References . . . . . . . . . . . . . . . . . . . 54
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