ITU-T H.248.20-2002 网关控制协议: H.221和H.223多路复用当地和远距离描述符的使用 H系列:视听服务的视听和多媒体系统基础设施 通信程序 Gateway Control Protocol: The use of Local and Remote Descriptors with H.221 and H.223 Multiplexing

pdf标准 ITU-T H.248.20-2002 网关控制协议: H.221和H.223多路复用当地和远距离描述符的使用 H系列:视听服务的视听和多媒体系统基础设施 通信程序 Gateway Control Protocol: The use of Local and Remote Descriptors with H.221 and H.223 Multiplexing

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ITU-T H.248.20-2002 网关控制协议: H.221和H.223多路复用当地和远距离描述符的使用 H系列:视听服务的视听和多媒体系统基础设施 通信程序 Gateway Control Protocol: The use of Local and Remote Descriptors with H.221 and H.223 Multiplexing  第 1 页 ITU-T H.248.20-2002 网关控制协议: H.221和H.223多路复用当地和远距离描述符的使用 H系列:视听服务的视听和多媒体系统基础设施 通信程序 Gateway Control Protocol: The use of Local and Remote Descriptors with H.221 and H.223 Multiplexing  第 2 页 ITU-T H.248.20-2002 网关控制协议: H.221和H.223多路复用当地和远距离描述符的使用 H系列:视听服务的视听和多媒体系统基础设施 通信程序 Gateway Control Protocol: The use of Local and Remote Descriptors with H.221 and H.223 Multiplexing  第 3 页 ITU-T H.248.20-2002 网关控制协议: H.221和H.223多路复用当地和远距离描述符的使用 H系列:视听服务的视听和多媒体系统基础设施 通信程序 Gateway Control Protocol: The use of Local and Remote Descriptors with H.221 and H.223 Multiplexing  第 4 页 ITU-T H.248.20-2002 网关控制协议: H.221和H.223多路复用当地和远距离描述符的使用 H系列:视听服务的视听和多媒体系统基础设施 通信程序 Gateway Control Protocol: The use of Local and Remote Descriptors with H.221 and H.223 Multiplexing  第 5 页
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INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU H.248.20 (11/2002) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services – Communication procedures Gateway control protocol: The use of local and remote descriptors with H.221 and H.223 multiplexing ITU-T Recommendation H.248.20 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS INFRASTRUCTURE OF AUDIOVISUAL SERVICES General Transmission multiplexing and synchronization Systems aspects Communication procedures Coding of moving video Related systems aspects SYSTEMS AND TERMINAL EQUIPMENT FOR AUDIOVISUAL SERVICES SUPPLEMENTARY SERVICES FOR MULTIMEDIA MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures Mobility for H-Series multimedia systems and services Mobile multimedia collaboration applications and services Security for mobile multimedia systems and services Security for mobile multimedia collaboration applications and services Mobility interworking procedures Mobile multimedia collaboration inter-working procedures For further details, please refer to the list of ITU-T Recommendations. H.100–H.199 H.200–H.219 H.220–H.229 H.230–H.239 H.240–H.259 H.260–H.279 H.280–H.299 H.300–H.399 H.450–H.499 H.500–H.509 H.510–H.519 H.520–H.529 H.530–H.539 H.540–H.549 H.550–H.559 H.560–H.569 ITU-T Recommendation H.248.20 Gateway control protocol: The use of local and remote descriptors with H.221 and H.223 multiplexing Summary This Recommendation defines how the Local and Remote descriptors are used within H.248, H.221 and H.223 multiplexing (MUX) terminations to associate demultiplexed streams (logical channels) with H.248.1 streams. Source ITU-T Recommendation H.248.20 was prepared by ITU-T Study Group 16 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 November 2002. ITU-T Rec. H.248.20 (11/2002) i FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. 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 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 Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-T's 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. 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 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, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database.  ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ii ITU-T Rec. H.248.20 (11/2002) CONTENTS Page 1 Scope ............................................................................................................................ 1 2 References..................................................................................................................... 1 3 Definitions .................................................................................................................... 2 4 Abbreviations................................................................................................................ 2 5 Logical channel parameters within the MUX termination ........................................... 5.1 Text encoding ................................................................................................. 5.1.1 "c=line" Line for H.221 and H.223 MUX termination ...............

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