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Content for  TR 24.880  Word version:  8.2.0

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1  ScopeWord‑p. 6

The present document describes the implementation options and requirements for a media server control protocol to be used with the Mr and ISC interfaces.
This Technical Report includes the study of the following items:
  • Define the requirements for a media server control protocol.
  • Consider existing standards work that should be studied for the definition of a media server control protocol.
  • Study and determine whether the media server control protocol should be carried in SIP or whether SIP should be used to setup a dedicated control interface.
  • Study whether the AS directing the SIP session to the MRFC is always the same SIP-AS that should control the MRFC.
  • Determine whether the media server control protocol should have a package naming and extension capability (similar to H.248 packages) to allow the support and registration of different media processing capabilities.
  • Determine the SIP call flows and SDP capabilities associated with the media server control protocol and whether these SIP messages need to be passed through a S-CSCF proxy function or whether it is more efficient to have a direct AS-MRFC interface.
This Technical Report will be used to move into the specification phase for a media server control protocol.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
RFC 3261  (June 2002): "SIP: Session Initiation Protocol".
[3]
RFC 4240  (December 2005): "Basic Network Media Services with SIP".
[4]
draft-ietf-mediactrl-vxml:  "SIP Interface to VoiceXML Media Services".
[5]
W3C Recommendation (March 2004): "Voice Extensible Markup Language (VoiceXML) Version 2.0", http://www.w3.org/TR/2004/REC-voicexml20-20040316/.
[6]
W3C Proposed Recommendation (April 2007): "Voice Extensible Markup Language (VoiceXML) Version 2.1", http://www.w3.org/TR/2007/PR-voicexml21-20070425/.
[7]
W3C Working Draft (January 2007): "Voice Browser Call Control: CCXML Version 1.0", http://www.w3.org/TR/2007/WD-ccxml-20070119/.
[8]
RFC 2616  (June 1999): "Hypertext Transfer Protocol -- HTTP/1.1".
[9]
draft-ietf-mediactrl-sip-control-framework:  "A Control Framework for the Session Initiation Protocol (SIP)".
[10]
draft-mcglashan-mscp:  "Media Server Control Protocol (MSCP)".
[11]
RFC 4140  (September 2005): "TCP-Based Media Transport in the Session Description Protocol (SDP)".
[12]
draft-ietf-simple-message-sessions:  "The Message Session Relay Protocol".
[13]
draft-ietf-speechsc-mrcpv2:  "Media Resource Control Protocol Version 2 (MRCPv2)".
[14]
draft-saleem-msml:  "Media Server Markup Language (MSML)".
[15]
RFC 4722  (Noivember, 2006) : "Media Server Control Markup Language (MSCML) and Protocol".
[16]
draft-boulton-ivr-control-package:  "A Basic Interactive Voice Response (IVR) Control Package for the Session Initiation Protocol (SIP)".
[17]
draft-boulton-ivr-vxml-control-package:  "A VoiceXML Interactive Voice Response (IVR) Control Package for the Session Initiation Protocol (SIP)".
[18]
draft-boulton-conference-control-package:  "A Conference Control Package for the Session Initiation Protocol (SIP)".
[19]
RFC 4353  (February, 2006): "A Framework for Conferencing with the Session Initiation Protocol (SIP)"
[20]
RFC 2976  (October, 2000): "The SIP INFO Method".
[21]
International Packet Communications Consortium: "IPCC Reference Architecture V2" (June 2002).
[22]
draft-ietf-mediactrl-requirements:  "Media Server Control Protocol Requirements".
[23]
draft-ietf-xcon-common-data-model:  "A Common Conference Information Data Model for Centralized Conferencing (XCON)"
[24]
TS 24.147: "Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem"
[25]
RFC 4582  (November 2006): "The Binary Floor Control Protocol (BFCP)"
[26]
RFC 4575  (August 2006): "A Session Initiation Protocol (SIP) Event Package for Conference State"
[27]
RFC 4566  (July 2006): "Session Description Protocol (SDP)"
[28]
RFC 3264  (June 02): "An Offer/Answer Model with the Session Description Protocol (SDP)"
[29]
W3C Working Draft (February 2007): "State Chart XML (SCXML): State Machine Notation for Control Abstraction", http://www.w3.org/TR/2007/WD-scxml-20070221/.
[30]
RFC 2326  (April, 1998): "Real Time Streaming Protocol (RTSP)".
[31]
RFC 4245  (November 2005): "High-Level Requirements for Tightly Coupled SIP Conferencing".
[32]
draft-ietf-xcon-framework:  "A Framework and Data Model for Centralized Conferencing".
[33]
TS 23.228: "IP multimedia subsystem; Stage 2".
[34]
draft-boulton-mediactrl-mrb.txt:  "Media Resource Brokering"
[35]
TS 23.218: "IP Multimedia (IM) session handling; IM call model; Stage 2".
[36]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP)
and Session Description Protocol (SDP); Stage 3".
[37]
TS 23.333: "Multimedia Resource Function Controller (MRFC) - Multimedia Resource Function Processor (MRFP) Mp interface: Procedures Descriptions".
[38]
TS 24.247: "Messaging service using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3".
[39]
TS 32.240: "Telecommunication management; Charging management; Charging architecture and principles".
[40]
TS 32.260: "Telecommunication management; Charging management; IP Multimedia Subsystem (IMS) charging".
[41]
TS 33.210: "3G Security; Network Domain Security; IP network layer security".
[42]
TS 22.115: " Service aspects; Charging and billing".
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3  Definitions and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
The following terms and definitions given in RFC 4353 [19] apply (unless otherwise specified):
Conference
Conference-URI
Conference-Aware participant
Conference policy
Focus
Mixer
Participant
Tightly Coupled Conference
Conference Notification Service
Conference policy server
The following terms and definitions given in draft-boulton-mediactrl-mrb-00.txt [34] apply (unless otherwise specified):
MRB
Query MRB
In-Line MRB
The following terms and definitions given in TS 33.210 apply (unless otherwise specified):
Security Domain
Confidentiality
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3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
AS
Application Server
MRFC
Multimedia Resource Function Controller
MRFP
Multimedia Resource Function Processor
S-CSCF
Serving CSCF

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