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ITU-T H 248 38-2006 Gateway control protocol Base context package《网关控制协议 基地环境包》.pdf

1、 International Telecommunication Union ITU-T H.248.38TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (05/2006) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Base context package ITU-T Recommendation H.248.38 ITU-

2、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.230H.239 Communication procedures H.240H.259 Codin

3、g 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 audiovisual and multimedia services H.360H.369 Sup

4、plementary 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 multimedia collaboration applications and services H.52

5、0H.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 multimedia collaboration inter-working procedures H.560H.569 BROADBAND AND TRIPLE-PLAY MULTIMEDIA

6、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.248.38 (05/2006) i ITU-T Recommendation H.248.38 Gateway control protocol: Base context package Summary The H.248.38 Base Context (BC) package contains pro

7、perties that affect the context as a whole by providing the media gateway controller with the ability to audit the media gateway for the exact number of terminations present in a context, thus avoiding the return of the complete list of termination identifiers. The context describes the topology (wh

8、o hears/sees whom) and the media mixing and/or switching parameters if more than two terminations are involved in the association. This function can be used to limit the amount of data returned in an audit reply containing only the pertinent information requested. Source ITU-T Recommendation H.248.3

9、8 was approved on 29 May 2006 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. H.248.38 (05/2006) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunica

10、tion 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 with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly

11、(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 Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fa

12、ll 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 for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this R

13、ecommendation 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 s

14、uch 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 party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recomm

15、endation 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 appr

16、oval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB

17、patent database. ITU 2006 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.248.38 (05/2006) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 1 4 Abbreviations 1 5 Base Context (

18、BC) package 1 5.1 Properties 1 5.2 Events . 2 5.3 Signals 2 5.4 Statistics 2 5.5 Error codes 2 5.6 Procedures 2 ITU-T Rec. H.248.38 (05/2006) 1 ITU-T Recommendation H.248.38 Gateway control protocol: Base context package 1 Scope A context is an association between a number of terminations. The conte

19、xt describes the topology (who hears/sees whom) and the media mixing and/or switching parameters if more than two terminations are involved in the association. This package contains properties that describe the context. Therefore, these properties are defined in the ContextAttribute Descriptor. 2 Re

20、ferences The following 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; u

21、sers of this Recommendation 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 Recomm

22、endation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation H.248.1 (2005), Gateway control protocol: Version 3. 3 Terms and definitions Not applicable. 4 Abbreviations Not applicable. 5 Base Context (BC) package Package Name: Base Context Package Packa

23、geID: bc (0x009b) Description: This package contains properties that affect the context as a whole. Version: 1 Extends: None 5.1 Properties 5.1.1 Number of terminations in a context Property Name: Number of terminations in a context PropertyID: numterm (0x0001) Description: The value of this propert

24、y gives the number of terminations present in a context. Type: Integer Possible values: Positive integer 2 ITU-T Rec. H.248.38 (05/2006) Default: None Defined in: ContextAttribute Characteristics: Read 5.2 Events None. 5.3 Signals None. 5.4 Statistics None. 5.5 Error codes None. 5.6 Procedures None.

25、 Printed in Switzerland Geneva, 2006 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Tra

26、nsmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Co

27、nstruction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment S

28、eries P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems

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