Content for  TS 24.247  Word version:  16.0.0

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1  ScopeWord‑p. 6
The present document provides the protocol details for the messaging service within the IP Multimedia CN Subsystem (IMS) based on the Session Initiation Protocol (SIP), the Session Description Protocol (SDP) and, the Message Session Relay Protocol (MSRP) . The document covers immediate messaging, session based messaging and session-based messaging conferences, as described in TS 22.340.
Where possible the present document specifies the requirements for this protocol by reference to specifications produced by the IETF within the scope of SIP, SDP and, MSRP, either directly, or as modified by TS 24.229.
The present document is applicable to Application Servers (ASs) , Media Resource Function Controllers (MRFCs), Media Resource Function Processors (MRFPs) and to User Equipment (UE) providing messaging capabilities.
This document does not cover the signalling between a MRFC and a MRFP.

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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 22.228: "Service requirements for the Internet Protocol (IP) multimedia core network subsystem; Stage 1".
TS 23.218: "IP Multimedia (IM) Session Handling; IP Multimedia (IM) call model; Stage 2".
TS 24.228: Release 5: "Signalling flows for the IP multimedia call control based on SIP and SDP; Stage 3".
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
RFC 3261  (March 2002): "SIP: Session Initiation Protocol".
RFC 3428  (December 2002): "Session Initiation Protocol (SIP) Extension for Instant Messaging".
RFC 4975  (September 2007): "The Message Session Relay Protocol (MSRP)".
TS 24.147: "Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3".
TS 22.340: "IP Multimedia System (IMS) messaging; Stage 1".
RFC 5365  (October 2008): "Multiple-Recipient MESSAGE Requests in the Session Initiation Protocol (SIP)".
RFC 3994  (January 2005): "Indication of Message Composition for Instant Messaging".
TS 26.141: "IP Multimedia System (IMS) Messaging and Presence; Media formats and codecs".
RFC 5547  (May 2009): "A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer".
RFC 5360  (October 2008): "A Framework for Consent-Based Communications in the Session Initiation Protocol (SIP)".
3GPP2 C.S0050-B: "3GPP2 File Formats for Multimedia Services".
RFC 6135  (February 2011): "An Alternative Connection Model for the Message Session Relay Protocol (MSRP)".
RFC 6714  (August 2012): " Connection Establishment for Media Anchoring (CEMA) for the Message Session Relay Protocol (MSRP)".

3  Definitions, symbols and abbreviationsWord‑p. 7

3.1  Definitions

IsComposing information This is a term used to indicate that an indication is sent to the communicating user when a user in entering a new message.
For the purposes of the present document, the following terms and definitions given in TS 22.340 apply:
Immediate messaging
Session based messaging
Session based messaging conferences
For the purposes of the present document, the following terms and definitions given in RFC 4975 [9] apply:
Page-mode messaging
Session inactivity timer
Session-mode messaging
Session-mode messaging conferences
For the purposes of the present document, the following terms and definitions given in TS 24.147 apply:
Conferencing Application Server

3.2  Abbreviations

For the purposes of the present document, the following abbreviations apply:
Application Server
Core Network
Data manipulator
Data manipulation server
IP Multimedia
IP Multimedia CN subsystem
Internet Protocol
Media Resource Function Controllers
Media Resource Function Processors
Message Session Relay Protocol
Service Based Local Policy
Session Description Protocol
Session Initiation Protocol
User Equipment
Uniform Resource Locator

4  Messaging overviewWord‑p. 8
The basic services for the IP Multimedia core network Subsystem (IMS), as defined in TS 24.229, allow a user to initiate, modify and terminate media sessions using the Session Initiation Protocol, as defined in RFC 3261. Although these basic mechanisms already allow the exchange of instant messaging information using SIP, this functionality can be extended to provide a richer service within the IMS.
The messaging service within the IM CN subsystem provides the means for a user to send or receive single messages immediately to / from another user and to create and participate in a messaging conference with one ore more other users. Participants to such message based communication may be internal or external to the home network.
When to use an immediate message and when to use a session-based messaging session will depend on the application.
For immediate messaging the procedures for page-mode messaging, as defined in RFC 3428 or for session-mode messaging, as defined in RFC 4975, RFC 6714 and RFC 6135 are utilized. When to use an page-mode messaging and when to use session-mode messaging session for the purpose of immediate messaging will depend on the application.
For session-based messaging and session-based messaging conferences, the Message Session Relay Protocol (MSRP) is utilized to transport messages.
The architecture for the 3GPP messaging is specified in TS 23.228 and TS 23.218. The 3GPP recommended media formats and codecs are specified in TS 26.141. The 3GPP2 recommended media formats and codecs are specified in 3GPP2 C.S0050-B [17].
The functional split for session-mode messaging between an AS, MRFC and MRFP is that same as that described in clause 4 in TS 24.147 for SIP based conferences. The functional split between the AS, MRFC and MRFP for page-model messaging is out of scope of the present document.

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