1、 International Telecommunication Union ITU-T H.248.72TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2009) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: ITU-T H.248 support for media-oriented negotiation acce
2、leration (MONA) Recommendation ITU-T H.248.72 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.
3、230H.239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for
4、audiovisual and multimedia services H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multi
5、media collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedur
6、es H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV middle
7、ware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.248.72 (12/2009) i Recommenda
8、tion ITU-T H.248.72 Gateway control protocol: ITU-T H.248 support for media-oriented negotiation acceleration (MONA) Summary Recommendation ITU-T H.248.72 defines two ITU-T H.248 packages that are intended for media gateways and media gateway controllers designed to support the media-oriented negoti
9、ation acceleration (MONA) negotiation procedures from Recommendation ITU-T H.324. More specifically, this Recommendation contains: The “MONA Preference“ package that supports the sending and reception of MONA preference messages as well as the handling of the completion conditions; the detection of
10、legacy conditions allowing for a swift fallback to Recommendation ITU-T H.245 interworking and the sending and reception of media in preconfigured channels, the so-called media preconfigured channel (MPC). The “H.245 Transport for SPC Use“ package, that supports the sending and reception of ITU-T H.
11、245 messages using the signalling preconfigured channel (SPC) during a MONA negotiation procedure. History Edition Recommendation Approval Study Group 1.0 ITU-T H.248.72 2009-12-14 16 ii Rec. ITU-T H.248.72 (12/2009) FOREWORD The International Telecommunication Union (ITU) is the United Nations spec
12、ialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them
13、with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T R
14、ecommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used fo
15、r conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g., interoperability or applicability) and compliance with the Reco
16、mmendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any p
17、arty. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property
18、 Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implem
19、enters are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2010 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written
20、 permission of ITU. Rec. ITU-T H.248.72 (12/2009) iii CONTENTS Page 1 Scope 1 2 References. 2 3 Definitions 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 H.245 Transport for SPC Use package . 3 6.1 Properties 3 6.2 Events . 3 6.3 Signals 4 6.4 Statistics 4 6.5 Error codes 4 6.6 Procedures 5 7 M
21、ONA preference package 5 7.1 Properties 6 7.2 Events . 7 7.3 Signals 9 7.4 Statistics 10 7.5 Error codes 10 7.6 Procedures 10 Rec. ITU-T H.248.72 (12/2009) 1 Recommendation ITU-T H.248.72 Gateway control protocol: ITU-T H.248 support for media-oriented negotiation acceleration (MONA) 1 Scope This Re
22、commendation defines ITU-T H.248 packages that allow a decomposed gateway to realize the media-oriented negotiation acceleration (MONA) negotiation procedures specified in Annex K of ITU-T H.324. During the MONA negotiation, terminals exchange their capabilities depending on which of the methods for
23、 establishing media channels are supported: signalling preconfigured channel (SPC); media preconfigured channel (MPC); accelerated ITU-T H.245 procedure (ACP). The ACP method is supported in all terminals. The exchange of the MONA preference messages allows the determination of which of the three me
24、thods is used. The “MONA Preference“ package supports the sending and reception of MONA preference messages. It provides the following capabilities: Sending and reception of MONA preference messages including automatic retransmission. Sending and reception of media in preconfigured channels during t
25、he MONA negotiation procedures. Detection of legacy condition: this capability allows for a swift fallback to ITU-T H.245 interworking. Completion of the MONA negotiation procedures. The “MONA Preference“ package is thus mandatory for any decomposed gateway that supports the ITU-T H.324, Annex K MON
26、A procedures. The “MONA Preference“ package also includes the needed ITU-T H.248 capabilities for the use of the MPC method to establish media channels. These MPC related capabilities within the package only need to be supported by decomposed gateways supporting MPCs. The “H.245 Transport for SPC Us
27、e“ package allows the sending and reception of ITU-T H.245 messages using the SPC method during a MONA negotiation procedure. It also allows for the automatic retransmission of the messages to the remote end. This package is defined as an extension of the “H.245 Transport“ package. Decomposed gatewa
28、ys that support the SPC method for establishing media channels need to support the “H.245 Transport for SPC Use“ package in addition to the “MONA Preference“ package. The ACP method is used when the terminals do not support another common method, SPC or MPC, or in order to establish missing channels
29、 when not all media channels have been already established with MPC. The ACP procedures are realized by exchanging ITU-T H.245 messages. The required ITU-T H.248 capabilities are provided by the ITU-T H.248.12 Amd.2 H.245 transport package. 2 Rec. ITU-T H.248.72 (12/2009) 2 References The following
30、ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommenda
31、tion are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give
32、it, as a stand-alone document, the status of a Recommendation. ITU-T H.223 Recommendation ITU-T H.223 (2001), Multiplexing protocol for low bit rate multimedia communication. ITU-T H.245 Recommendation ITU-T H.245 (2008), Control protocol for multimedia communication. ITU-T H.248.12 Amd.2 Recommenda
33、tion ITU-T H.248.12 (2007), Gateway control protocol: H.248.1 packages for H.323 and H.324 interworking, Amendment 2 (2007), Transport mechanism. ITU-T H.324 Recommendation ITU-T H.324 (2009), Terminal for low bit-rate multimedia communication. 3 Definitions None. 4 Abbreviations and acronyms This R
34、ecommendation uses the following abbreviations and acronyms: ACP Accelerated ITU-T H.245 procedures AMR-WB Adaptive Multi Rate Wide Band ICM Inferred Common Mode MG Media Gateway MGC Media Gateway Controller MONA Media-Oriented Negotiation Acceleration MOS Media-Oriented Set-up MPC Media Preconfigur
35、ed Channel MSD Master Slave Determination MUX Multiplexer OID Object Identifier PDU Protocol Data Unit RTD Round Trip Delay RX Receive SPC Signalling Preconfigured Channel TCS Terminal Capability Set TX Transmit Rec. ITU-T H.248.72 (12/2009) 3 5 Conventions None. 6 H.245 Transport for SPC Use packag
36、e Package name: H.245 Transport for SPC Use Package ID: h245tpspc (0x00f7) Description: This package extends the ITU-T H.248.12 Amd.2 H.245 transport package “h245tp“ and defines a mechanism for the transport of ITU-T H.245 messages when SPC is used. Version: 1 Extends: h245tp (0x00b4) version 1 6.1
37、 Properties None. 6.2 Events This package does not define any new event. It defines an event parameter and an observed event parameter that can be used in the h245tpspc/h245msgin event defined in the base package. 6.2.1 EventsDescriptor parameters 6.2.1.1 Signalling preconfigured channel Parameter n
38、ame: SPC Parameter ID: spc (0x0001) Description: This parameter indicates whether the incoming ITU-T H.245 message is expected to be received in the signalling preconfigured channel (SPC) or as a legacy ITU-T H.245 message. If the incoming ITU-T H.245 message is received differently to what this par
39、ameter specifies, the event does not occur, i.e., the ITU-T H.245 message is not reported. After the MG has detected a monapref/legdet event, the MG does not need to continue detecting incoming ITU-T H.245 messages in the SPC and shall not report them to the MGC, even if h245tpspc/h245msgin is not r
40、emoved from the EventsDescriptor. Type: Enumeration Optional: Yes Possible values: “H245“ (0x0001): Message should be received as a legacy ITU-T H.245. “SPC“ (0x0002): Message should be received in the SPC. “Both“ (0x0003): Message may be received either way. Default: “H245“ 6.2.2 ObservedEventsDesc
41、riptor parameters 6.2.2.1 Signalling preconfigured channel Parameter name: SPC Parameter ID: spc (0x0002) 4 Rec. ITU-T H.248.72 (12/2009) Description: This parameter indicates that the incoming ITU-T H.245 message has been received in the SPC. Type: Boolean Optional: Yes Possible values: ON: ITU-T H
42、.245 message was received in the SPC. OFF: ITU-T H.245 message was received as a legacy message. Default: OFF 6.3 Signals This package does not define any new signal. It defines a signal parameter that can be used in the h245tpspc/h245msgout signal defined in the base package. 6.3.1 Additional param
43、eters 6.3.1.1 Signalling preconfigured channel Parameter name: SPC Parameter ID: spc (0x0002) Description: This parameter indicates whether the MG shall send the ITU-T H.245 message in the SPC or as a legacy. Thus no message is sent if there is no MONA preference message sending ongoing, ordered wit
44、h signals monapref/monaprefmsgout. Type: Boolean Optional: Yes Possible values: ON: ITU-T H.245 message shall be sent in the SPC. OFF: ITU-T H.245 message shall be sent as a legacy. Default: OFF 6.3.1.2 Repetition Parameter name: Repetition Parameter ID: rep (0x0003) Description: Indicates that the
45、MG shall indefinitely repeat the sending of the ITU-T H.245 message in the SPC. This parameter is only relevant when the spc signal parameter equals ON. Type: Boolean Optional: Yes Possible values: ON: ITU-T H.245 message shall be repeated until the signal is removed OFF: ITU-T H.245 message shall o
46、nly be sent once Default: ON 6.4 Statistics None. 6.5 Error codes None. Rec. ITU-T H.248.72 (12/2009) 5 6.6 Procedures If the MGC wants to be notified about ITU-T H.245 messages received in the signalling preconfigured channel (SPC), it shall include the spc parameter set to “SPC“ in the h245tpspc/h
47、245msgin event. In that case, the MG will only report the event if the ITU-T H.245 message is received in the SPC. If the MGC wants to be notified about ITU-T H.245 messages either received in the SPC or as a legacy, it shall include the spc parameter set to “BOTH“ in the h245tpspc/h245msgin event.
48、If the MGC does not include the spc parameter in the h245tpspc/h245msgin event or if the MGC sets it to “H245“, the MG will only report reception of legacy ITU-T H.245 messages. If the MGC includes the spc parameter set to “BOTH“ in the h245tpspc/h245msgin event and the ITU-T H.245 message is receiv
49、ed in the SPC, the MG will include the spc parameter set to “SPC“ in the observed event. In any other case, it is optional for the MG to include the parameter as there is no ambiguity. When the MG is requested to detect incoming ITU-T H.245 messages in the SPC, i.e., spc parameter set to “SPC“ or to “BOTH“, the MG shall do so as long as the event remains active or until a monapref/legdet event is detected. This package can be used by MGC and MGs implementing the SPC procedures specified in ITU-T H.324. An MGC th
