1、 International Telecommunication Union ITU-T H.248.59TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2007) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Event timestamp notification package ITU-T Recommendati
2、on H.248.59 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.230H.239 Communication procedures
3、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 audiovisual and multimedia service
4、s 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 multimedia collaboration applications a
5、nd 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 multimedia collaboration inter-working procedures H.560H.569 BROADBAND AND TRIPLE-
6、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.248.59 (08/2007) i ITU-T Recommendation H.248.59 Gateway control protocol: Event timestamp notification package Summary ITU-T Recommendatio
7、n H.248.59 contains a H.248 package that provides means for determining whether or not a media gateway supports the use of timestamps with the event detection time at event notification, and allows the media gateway controller to request that timestamps be or not be reported together with event noti
8、fications, if this feature is supported by the media gateway. Source ITU-T Recommendation H.248.59 was approved on 29 August 2007 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. H.248.59 (08/2007) FOREWORD The International Telecommunication Union (ITU
9、) 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 standard
10、izing 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 cover
11、ed 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 for conciseness to indica
12、te 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 Recommendation is achieved w
13、hen 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 party. INTELLECTUAL PROPE
14、RTY 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 asserte
15、d 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, implementers are cautioned tha
16、t 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 2008 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-
17、T Rec. H.248.59 (08/2007) iii CONTENTS Page 1 Scope 1 2 Reference 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation. 1 4 Abbreviations and acronyms 1 5 Conventions 1 6 Event timestamp notification package 1 6.1 Properties 2 6.2 Events . 2 6.3 Signals 2 6.4 Stat
18、istics 2 6.5 Error Codes. 2 6.6 Procedures 2 ITU-T Rec. H.248.59 (08/2007) 1 ITU-T Recommendation H.248.59 Gateway control protocol: Event timestamp notification package 1 Scope This package is to provide a means of determining whether or not a media gateway supports the use of timestamps with the e
19、vent detection time at event notification. If timestamps are supported, it allows the media gateway controller to request that timestamps be or not be reported with an event notification. This package is useful for control associations where profiles are not used to specify whether or not a media ga
20、teway supports the notification of event timestamp. 2 Reference 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 Recommen
21、dations 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 references listed below. A list of the currently valid ITU-T Recommendations is regularly pu
22、blished. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.248.1 ITU-T Recommendation H.248.1 (2005), Gateway control protocol: Version 3. 3 Definitions 3.1 Terms defined elsewhere None. 3.2 Terms defined in th
23、is Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: MG Media Gateway MGC Media Gateway Controller 5 Conventions None. 6 Event timestamp notification package Package name: Event timestamp notification PackageID: etn (0x00cc) Descript
24、ion: This package contains a property which allows the MGC to determine or set whether or not a MG uses timestamps containing the detection time of an event in the notification of the detection of an event. Version: 1 2 ITU-T Rec. H.248.59 (08/2007) Extends: None 6.1 Properties 6.1.1 Request timesta
25、mp Property name: Request timestamp PropertyID: rt (0x0001) Description: This root-only property indicates whether or not the timestamp associated with event detection is included in a notify message. Type: Enumeration Possible values: “requested“ The timestamp is requested (i.e., included). “suppre
26、ssed“ The timestamp is suppressed (i.e., excluded). “autonomous“ Determined by the MG itself. Default: “autonomous“ Defined in: TerminationState Characteristics: Read/write 6.2 Events None. 6.3 Signals None. 6.4 Statistics None. 6.5 Error Codes None. 6.6 Procedures 6.6.1 Event timestamp capability d
27、etermination To determine whether a MG supports the sending of event detection timestamps in notify command requests, the MGC shall send an AuditCapabilities command request with an individual audit of the etn/rt property. If the MG does not support timestamps, it shall return “suppressed“ as the on
28、ly value. If the MG always sends timestamps, it shall return “requested“ as the only value. If it is the MG that determines whether or not a timestamp is sent, then it shall return “autonomous“ as the only value. If the MG supports either option (e.g., it is settable by the MGC), then it shall retur
29、n all supported options as values. If the MG cannot support any option, then it shall return empty. 6.6.2 Event timestamp notification setting If a MGC requires that event detection timestamps are included for all notify command requests, then it shall set the etn/rt property to “requested“ via a mo
30、dify command request. If a MGC requires that event detection timestamps are excluded for all NOTIFY.reqs, then it shall set the etn/rt property to “suppressed“ via a modify command request. ITU-T Rec. H.248.59 (08/2007) 3 If a MGC does not care if event detection timestamps are included or excluded,
31、 then it shall set the etn/rt property to “autonomous“ via a modify command request. If a MG cannot provide a timestamp for the event requested through an add, move or modify command request, it shall respond with error code 543 “MGC requested event detection timestamp not supported“. Printed in Swi
32、tzerland Geneva, 2008 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 Transmission syste
33、ms 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 Construction, ins
34、tallation 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 Series P Telepho
35、ne 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
