1、 International Telecommunication Union ITU-T H.248.81TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Guidelines on the use of the international e
2、mergency preference scheme (IEPS) call indicator and priority indicator in ITU-T H.248 profiles Amendment 1: New Appendix II, plus additions and corrections Recommendation ITU-T H.248.81 (2011) Amendment 1 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TE
3、LEPHONE 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.259Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipm
4、ent 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 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overvie
5、w 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.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile m
6、ultimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia
7、services and applications H.620H.629 Ubiquitous sensor network applications and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV meta
8、data H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.248.81 (2011)/Amd.1 (03/2013) i Recommendation ITU-T H.248.81 Gateway
9、control protocol: Guidelines on the use of the international emergency preference scheme (IEPS) call indicator and priority indicator in ITU-T H.248 profiles Amendment 1 New Appendix II, plus additions and corrections Summary Recommendation ITU-T H.248.81 provides guidelines on the use of the intern
10、ational emergency preference scheme (IEPS) call indicator and priority indicator in ITU-T H.248 profiles for ITU-T H.323 and NGN systems. These guidelines may be used by other standards development organizations (SDOs) when defining their profiles in support of priority services, e.g., the emergency
11、 telecommunications service (ETS) and the multimedia priority service (MPS). Amendment 1 to Recommendation ITU-T H.248.81 (2011/05) introduces additions and corrections to the Recommendation and adds Appendix II, “Use of ECN in the context of ETS traffic“. History Edition Recommendation Approval Stu
12、dy Group 1.0 ITU-T H.248.81 2011-05-14 16 1.1 ITU-T H.248.81 (2011) Amd. 1 2013-03-16 16 ii Rec. ITU-T H.248.81 (2011)/Amd.1 (03/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication t
13、echnologies (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 with a view to standardizing telecommunications on a worldwide basis. The World Te
14、lecommunication 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
15、 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 indicate both a telecommunication administration and a recognized
16、 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 when all of these mandatory provisions are met. The words
17、“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 PROPERTY RIGHTS ITU draws attention to the possibility that th
18、e 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
19、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 that this may not represent the latest information and are t
20、herefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.248.81 (2011)/Amd.1 (03/2013) iii Table of Conte
21、nts Page 1 Scope 1 2 References. 2 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 3 5 Conventions 4 6 Relation to other ITU-T Recommendations . 4 6.1 Recommendation ITU-T E.106: International emergency preference scheme for dis
22、aster relief operations 4 6.2 Recommendation ITU-T Q.1950 Annex F: Call bearer control Emergency call indication 4 6.3 Recommendation ITU-T Q.1950 Annex G: Call bearer control International emergency preference scheme 4 7 Functional requirements . 4 8 ITU-T H.248 profile specification guidelines 5 8
23、.1 Profile identification . 5 8.2 Summary . 5 8.3 Gateway control protocol version 5 8.4 Connection Model 5 8.5 Context Attributes 6 8.6 Terminations . 6 8.7 Descriptors 6 8.8 Command API 7 8.9 Generic command syntax and encoding . 8 8.10 Transactions 8 8.11 Messages . 9 8.12 Transport . 9 8.13 Secu
24、rity . 9 8.14 Packages . 9 8.15 Mandatory support of SDP and ITU-T H.248.1 Annex C information elements 9 8.16 Optional support of SDP and ITU-T H.248.1 Annex C information elements 9 8.17 Procedures 10 9 Explicit congestion notification (ECN) and ETS . 11 iv Rec. ITU-T H.248.81 (2011)/Amd.1 (03/201
25、3) Page Appendix I Overall example traffic model for decomposed gateways . 12 I.1 Overview 12 I.2 Traffic processing stages Model subcomponents 14 Appendix II Use of ECN in the context of ETS traffic . 16 II.1 Introduction 16 II.2 Use case examples 17 II.3 Observations . 19 Bibliography. 21 Rec. ITU
26、-T H.248.81 (2011)/Amd.1 (03/2013) 1 Recommendation ITU-T H.248.81 Gateway control protocol: Guidelines on the use of the international emergency preference scheme (IEPS) call indicator and priority indicator in ITU-T H.248 profiles Amendment 1 New Appendix II, plus additions and corrections 1 Scope
27、 ITU-T H.248.1 defines the international emergency preference scheme (IEPS) call indicator and priority indicator in support of priority services, e.g., the emergency telecommunications service (ETS) and the multimedia priority service (MPS). Use of the IEPS call indicator and priority indicator, as
28、 defined in ITU-T H.248.1, satisfies the ETS requirements of indicating an ETS context and carrying the priority level. Any prioritization of ITU-T H.248 procedures in the media gateway controller (MGC) and the transport of ITU-T H.248 control signalling towards the media gateway (MG) is based on th
29、e identification of ETS. The IEPS call indicator, identifying an ETS call/session, indicates to the MG that the context is an ETS context and enables prioritization of ITU-T H.248 control signalling once received. In addition, it enables prioritized resource allocation in the MG for an ETS context.
30、The priority indicator, carrying the priority level, provides the MG with a means to distinguish different priority handling of resources on the MG when ETS is used. This Recommendation provides guidelines on the use of the IEPS call indicator and priority indicator in ITU-T H.248 profiles for ITU-T
31、 H.323 and NGN systems. These guidelines may be used by other standards development organizations (SDOs) when defining their ITU-T H.248.1 profiles in support of priority services (e.g., ETS and the MPS). Further details on how these guidelines are used by other networks are outside the scope of thi
32、s Recommendation. It is up to other SDOs to decide their use when defining their profiles. ETS and IEPS are defined in ITU-T E.107 and ITU-T E.106, respectively. ETS and IEPS involve authority-to-authority communication. The emergency indicator, as defined in ITU-T H.248.1, is used for identificatio
33、n of emergency calls (i.e., individual-to-authority communication). The IEPS call indicator is used for the identification of a priority call/session (e.g., ETS call/session, IEPS call/session), allowing differentiation from an emergency call/session. The specification of profile procedures for the
34、emergency indicator is outside the scope of this Recommendation. National regulators may implement ETS in various ways. This Recommendation describes an implementation where the IEPS call indicator and priority indicator are supported. NOTE 1 National, regional or local emergency and public safety s
35、ervices, where an individual from the general public is seeking assistance (i.e., individual-to-authority communication), are outside the scope of this Recommendation. NOTE 2 b-ITU-T Q-Sup.53 provides the signalling requirements to support the IEPS. It is also applicable for ITU-T H.248 entities, bu
36、t does not indicate any requirement in addition to clause 7. NOTE 3 b-ITU-T Q-Sup.57 provides the signalling requirements to support the ETS in IP networks. It is also applicable for ITU-T H.248 entities, but does not indicate any requirement in addition to clause 7. 2 Rec. ITU-T H.248.81 (2011)/Amd
37、.1 (03/2013) 2 References 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 subje
38、ct 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 published. The reference to a document w
39、ithin this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T E.106 Recommendation ITU-T E.106 (2003), International Emergency Preference Scheme (IEPS) for disaster relief operations. ITU-T E.107 Recommendation ITU-T E.107 (2007), Emergency Telecommunic
40、ations Service (ETS) and interconnection framework for national implementations of ETS. ITU-T H.225.0 Recommendation ITU-T H.225.0 (2009), Call signalling protocols and media stream packetization for packet-based multimedia communication systems. ITU-T H.248.1 Recommendation ITU-T H.248.1 (20052013)
41、, Gateway control protocol: Version 3, including its Amendment 2 (2009). ITU-T H.248.4 Recommendation ITU-T H.248.4 (2009), Gateway control protocol: Transport over Stream Control Transmission Protocol (SCTP). ITU-T H.248.10 Recommendation ITU-T H.248.10 (2001), Gateway control protocol: Media gatew
42、ay resource congestion handling package. ITU-T H.248.11 Recommendation ITU-T H.248.11 (20022013), Gateway control protocol: Media gateway overload control package. ITU-T H.248.32 Recommendation ITU-T H.248.32 (20052013), Gateway control protocol: Detailed congestion reporting package. ITU-T H.248.52
43、 Recommendation ITU-T H.248.52 (2008), Gateway control protocol: QoS support packages. ITU-T H.248.54 Recommendation ITU-T H.248.54 (2007), Gateway control protocol: MPLS support package. ITU-T H.248.56 Recommendation ITU-T H.248.56 (2007), Gateway control protocol: Packages for virtual private netw
44、ork support. ITU-T H.248.63 Recommendation ITU-T H.248.63 (2009), Gateway control protocol: Resource management packages. ITU-T H.248.82 Recommendation ITU-T H.248.82 (2013), Gateway control protocol: Explicit congestion notification support. ITU-T H.323 Recommendation ITU-T H.323 (2009), Packet-bas
45、ed multimedia communications systems. ITU-T Q.1950 Recommendation ITU-T Q.1950 (2002), Bearer independent call bearer control protocol. ITU-T Q.1950 Amd.1 Recommendation ITU-T Q.1950 (2002) Amendment 1 (2006), New Annex G Call bearer control International Emergency Preference Scheme. Rec. ITU-T H.24
46、8.81 (2011)/Amd.1 (03/2013) 3 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following term defined elsewhere: 3.1.1 emergency telecommunications service (ETS) ITU-T E.107: A national service providing priority telecommunications to the ETS authorized users in times of disast
47、er and emergencies. 3.2 Terms defined in this Recommendation This Recommendation defines the following term: 3.2.1 subject to profile specification: When used, this term indicates that the ITU-T H.248 profile template section requires further specification by a profile specification. 4 Abbreviations
48、 and acronyms This Recommendation uses the following abbreviations: AQM Active Queue Management DSCP DiffServ Code Point ECN Explicit Congestion Notification ETS Emergency Telecommunications Service GoS Grade of Service IEPS International Emergency Preference Scheme IP Internet Protocol IPDV IP Pack
49、et Delay Variation IPLR IP Packet Loss Rate ISUP ISDN User Part LSP Label Switched Path LTE Long Term Evolution Lx Layer number MG Media Gateway MGC Media Gateway Controller MLPP Multi-Level Precedence and Pre-emption MPLS Multi-Protocol Label Switching MPS Multimedia Priority Service N/A Not Applicable NGN Next Generation Network PHB Per-Hop Behaviour QoE Quality of Experience QoS Quality of Service RPH Resource Priority Header 4 Rec. ITU-T H.248.81 (2011)/Amd.1 (
