1、 International Telecommunication Union ITU-T H.248.12TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(08/2007) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: H.248.1 packages for H.323 and H.324 interwo
2、rking Amendment 2: Transport mechanism ITU-T Recommendation H.248.12 (2001) Amendment 2ITU-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 sync
3、hronization H.220H.229 Systems aspects H.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
4、.359 Quality of service architecture for 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 sys
5、tems and services H.510H.519 Mobile multimedia 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.559Mobile multime
6、dia collaboration inter-working procedures H.560H.569 BROADBAND AND TRIPLE-PLAY MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) i ITU-T Recommendation H.248.12 Ga
7、teway control protocol: H.248.1 packages for H.323 and H.324 interworking Amendment 2 Transport mechanism Summary This Recommendation defines several H.248.1 packages that are intended for Media Gateways designed to support interworking between H.323 terminals and H.324 terminals. More specifically,
8、 this Recommendation contains: package “h324“ for creating terminations supporting H.324, package “h245“ for creating terminations supporting H.245 channels for H.324 calls, package “h323bc“ for creating terminations supporting H.245 channels for H.323 calls, package “h245com“ for the communication
9、of H.245 commands between a MGC and MG, and package “h245ind“ for the communication of H.245 indications. NOTE This Recommendation has been renumbered. It was formerly known as ITU-T Rec. H.248, Annex M4. Amendment 1 defined packages, which extend the existing H.324, H.245 command and H.245 indicati
10、on packages by adding properties. Amendment 2 defines a package which enables sending H.245 messages between a Media Gateway Controller (MGC) and a Media Gateway (MG) when the interworking function is handled by the MGC. Source Amendment 2 to ITU-T Recommendation H.248.12 (2001) was approved on 29 A
11、ugust 2007 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication S
12、tandardization 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 with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA)
13、, 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 Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall wit
14、hin 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 for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recomme
15、ndation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as
16、 “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 party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendati
17、on may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval o
18、f this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent
19、 database at http:/www.itu.int/ITU-T/ipr/. ITU 2008 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) iii CONTENTS Page 1 Introduction 1 2 Scope 1 3 References. 2 4 H.32
20、4 package 2 4.1 Properties 3 4.2 Events . 5 4.3 Signals 6 4.4 Statistics 6 4.5 Procedures 6 5 H.245 Package 7 5.1 Properties 7 5.2 Events . 8 5.3 Signals 11 5.4 Statistics 11 5.5 Procedures 11 6 H.323 Bearer Control Package . 11 6.1 Properties 11 6.2 Events . 12 6.3 Signals 12 6.4 Statistics 12 6.5
21、Procedures 12 7 H.245 Command Package 13 7.1 Properties 13 7.2 Events . 14 7.3 Signals 14 7.4 Statistics 15 7.5 Procedures 15 8 H.245 Indication package . 15 8.1 Properties 15 8.2 Events . 16 8.3 Signals 16 8.4 Statistics 16 8.5 Procedures 16 iv ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) Page 9 Call
22、 flows 16 9.1 H.323-Annex C/H.324 interworking with H.245 in MG . 16 9.2 H.323-Annex C/H.324 interworking with H.245 in MGC. 19 9.3 Tunnelling of Annex C/H.324 bitstream 21 Annex A Extended H.324, H.245 command and H.245 indication packages 23 A.1 Scope 23 A.2 References 23 A.3 Definitions 23 A.4 Ab
23、breviations and acronyms 23 A.5 Extended H.324 package 23 A.6 Extended H.245 command package . 27 A.7 Extended H.245 indication package. 28 A.8 H.245 transport package. 30 Bibliography. 32 ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) 1 ITU-T Recommendation H.248.12 Gateway control protocol: H.248.1 pa
24、ckages for H.323 and H.324 interworking Amendment 2 Transport mechanism 1 Introduction This Recommendation gathers packages for H.245, H.245 parameters specific to H-series audiovisual terminals, and Annex C/H.324 terminals for use with the H.248.1 gateway control protocol. The packages in this Reco
25、mmendation are in conformance with clause 12/H.248.1 package definition guidelines. Amendment 1 introduced extended H.324, H.245 command and H.245 indication packages for interworking with H.324 terminals having different H.324 capabilities, when the interworking function is handled by the MGC. Amen
26、dment 2 introduces a H.245 transport package that allows H.245 signalling to be sent between a MGC and MG across H.248. 2 Scope This Recommendation describes packages for the H.248.1 gateway control protocol related to interworking of H.323 and H.324 terminals, as follows: Package “h324“ for termina
27、tion of H.324 bitstream on MGs. Package “h245“ for termination of H.245 messages on MGs. Package “h323bc“ for H.245 parameters specific to H.323. Package “h245com“ for providing properties that allow the MGC to indicate to the MG that the MGC has sent or received an H.245 command. Package “h245ind“
28、for providing properties that allow the MGC to indicate to the MG that the MGC has sent or received an H.245 indication. With the terminations implementing “h324“, “h245com“ and “h245ind“ packages, the decomposed gateway may support H.324 communication with the H.245 control function in the MGC. In
29、the H.324 and H.323 interworking scenario with this decomposed gateway, H.245 control messages are terminated in the MGC (a backhaul is used between the MG and the MGC to transport H.245 messages between the MG and the MGC, on the H.324 side). The terminations for media on both H.324 and H.323 sides
30、 are managed by the MGC. With the terminations implementing “h324“ and “h245“ packages, the decomposed gateway may support H.324 communication with H.245 control in the MG. In the H.324 and H.323 interworking scenario with this decomposed gateway, H.245 control messages from the H.324 side and the H
31、.323 side are terminated in the “h245“ termination and in the “h323bc“ termination respectively, and are processed in the MG. The MG manages the logical channels for media. Annex A describes extended H.324, H.245 command, H.245 indication and H.245 transport packages for interworking with H.324 term
32、inals having different H.324 capabilities, when the interworking function is handled by the MGC. 2 ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) 3 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this
33、Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other r
34、eferences 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 it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation H.223 (2001), Multiplexing protocol for low bit
35、 rate multimedia communication. ITU-T Recommendation H.245 (2006), Control protocol for multimedia communication. ITU-T Recommendation H.323 (2000), Packet-based multimedia communications systems. ITU-T Recommendation H.324 (2005), Terminal for low bit-rate multimedia communication. ITU-T Recommenda
36、tion V.8 (2000), Procedures for starting sessions of data transmission over the public switched telephone network. ITU-T Recommendation V.8 bis (2000), Procedures for the identification and selection of common modes of operation between data circuit-terminating equipments (DCEs) and between data ter
37、minal equipments (DTEs) over the public switched telephone network and on leased point-to-point telephone-type circuits. ITU-T Recommendation V.34 (1998), A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2
38、-wire telephone-type circuits. ITU-T Recommendation V.42 (1996), Error-correcting procedures for DCEs using asynchronous-to-synchronous conversion. ITU-T Recommendation V.42 bis (1990), Data compression procedures for data circuit-terminating equipment (DCE) using error correction procedures. ITU-T
39、Recommendation V.140 (1998), Procedures for establishing communication between two multiprotocol audiovisual terminals using digital channels at a multiple of 64 or 56 kbit/s. ITU-T Recommendation X.691 (2002), Information technology ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)
40、. 4 H.324 package Package Name: H.324 PackageID: h324, (0x002c) Version: 1 Extends: None Description: This package is defined to support terminations for calls using ITU-T Rec. H.324. The transport mechanism or bearer channel will be different for each environment where the package is used. Figure 1
41、 shows the functional view of a H.324 multimedia call and the MGC control points defined in the H.324 package. In ITU-T Rec. H.324, there are three communication modes defined according to the underlying network: a ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) 3 PSTN mode defined in ITU-T Rec. H.324 ma
42、in body (H.324P), a mobile network mode defined in Annex C/H.324 (H.324M), and an ISDN mode defined in Annex D/H.324 (H.324I). One of these communication modes shall be selected when the termination implementing the H.324 package is invoked by the MGC. In version 1 of the H.324 package, only the fun
43、ctionalities required of the H.324M mode are defined. The functionalities for H.324P and H.324I are FFS, and will be defined in version 2, or later. T1609880-01TDMV.140 V.8 V.8 bisV.34LC 0 LCi LCjH.324M H.324I H.324PLAPM NSRPCCSRLSRPAnalogue lineH.223 Level 0 3AudioH.245 messagesControl point define
44、d in H.324 packageH.223 bitstream withoutbeing demultiplexedVideoFigure 1/H.248.12 Control point defined in H.324 package 4.1 Properties 4.1.1 Communication mode Property Name: Communication mode PropertyID: cmod (0x0001) Type: Enumeration Possible values: H324P (0x0001) H324 operating in the base P
45、STN mode using a V-series modem H324M (0x0002) Annex C/H.324 (Mobile) H324I (0x0003) Annex D/H.324 (ISDN) Default: Provisioned Defined in: TerminationState Characteristics: Read/Write 4 ITU-T Rec. H.248.12 (2001)/Amd.2 (08/2007) Description: This property indicates the communication mode to be follo
46、wed by the termination. 4.1.2 Highest Multiplexing Level Property Name: Highest Multiplexing level PropertyID: muxlv (0x0002) Type: Enumeration Possible values: Level0 (0x0001) H.223 level 0 defined in ITU-T Rec. H.223 Level1 (0x0002) H.223 level 1 defined in Annex A/H.223 Level2 (0x0003) H.223 leve
47、l 2 defined in Annex B/H.223 Level3 (0x0004) H.223 level 3 defined in Annex C/H.223 Default: Level0 Defined in: TerminationState Characteristics: Read/Write Description: This property indicates the highest level of H.223 multiplexing which can be used by the termination. The indicated level is used
48、in the multiplex level initialization phase as defined in C.6/H.324. The default value is Level0. If the communication mode property is set to H324P or H324I, the value of the highest multiplexing level property shall be set to Level0. 4.1.3 Demultiplex Property Name: Demultiplex PropertyID: demux (
49、0x0003) Type: Boolean Possible values: TRUE (0x0001) H.223 multiplexed stream is demultiplexed FALSE (0x0000) H.223 multiplexed stream is not demultiplexed Default: TRUE Defined in: LocalControl Characteristics: Read/Write Description: This property specifies the operation on the H.223 multiplexed stream received by the termination. If set to FALSE, the H.223 multiplexed stream is relayed to the other termination without being demultiplexed. If set to TRUE, each logical channel data is extracted
