1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T H.248.81 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2 (04/2015) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services Communication procedures Gateway control protocol: Guideline
2、s on the use of the international emergency preference scheme (IEPS) call indicator and priority indicator in ITU-T H.248 profiles Amendment 2: DiffServ signalling approach Recommendation ITU-T H.248.81 (2011) Amendment 2 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERIST
3、ICS 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 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems an
4、d 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 Telepresence H.420H.429 Supplementary services for multimedia H.450H.499 MOBI
5、LITY 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.520H.529 Security for mobile multimedia systems and
6、services H.530H.539 Security for mobile multimedia 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
7、over VDSL H.610H.619 Advanced multimedia 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 applic
8、ation event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 E-HEALTH MULTIMEDIA SERVICES AND APPLICATIONS Interoperability compliance testing of personal health systems (HRN,
9、 PAN, LAN, TAN and WAN) H.820H.859 Multimedia e-health data exchange services H.860H.869 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.248.81 (2011)/Amd.2 (04/2015) i Recommendation ITU-T H.248.81 Gateway control protocol: Guidelines on the use of the internati
10、onal emergency preference scheme (IEPS) call indicator and priority indicator in ITU-T H.248 profiles Amendment 2 DiffServ signalling approach Summary Recommendation ITU-T H.248.81 provides guidelines on the use of the international emergency preference scheme (IEPS) call indicator and priority indi
11、cator 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 telecommunications service (ETS) and the multimedia priority service (MPS)
12、. 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“. Amendment 2 to Recommendation ITU-T H.248.81 (2011/05) includes additions to the Recommendation in support of marking
13、priority calls using the DiffServ signalling package as defined in Recommendation ITU-T H.248.52. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T H.248.81 2011-05-14 16 11.1002/1000/11292 1.1 ITU-T H.248.81 (2011) Amd. 1 2013-03-16 16 11.1002/1000/11862 1.2 ITU-T H.248.81 (2
14、011) Amd. 2 2015-04-29 16 11.1002/1000/12454 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T H.248.81 (2011)/Amd.2 (04/2015
15、) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for st
16、udying 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 gr
17、oups 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-Ts purview, the necessary standards are prepared on a collaborative basis with
18、 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 Recommendation is voluntary. However, the Recommendation may contain certain mandatory provis
19、ions (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 “must“ and the negative equivalents are used to express requirements. The use of su
20、ch words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 positio
21、n 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, protecte
22、d 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 database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reserved. No part of t
23、his publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.248.81 (2011)/Amd.2 (04/2015) iii Table of Contents 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 Abb
24、reviations 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 disaster relief operations 4 6.2 Recommendation ITU-T Q.1950 Annex F: Call bearer control Emergency call indication 4 6.3 Recommendati
25、on ITU-T Q.1950 Annex G: Call bearer control International emergency preference scheme 4 6.4 ITU-T H-series Recommendations Supplement 12: Gateway control protocol: Priority traffic treatment by ITU-T H.248 gateways 4 7 Functional requirements . 4 8 ITU-T H.248 profile specification guidelines 5 8.1
26、 Profile identification . 5 8.2 Summary . 5 8.3 Gateway control protocol version 5 8.4 Connection Model 6 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 9 8.11 Messages . 9 8.12 Transport . 9 8.13 Securi
27、ty . 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 10 8.17 Procedures 10 iv Rec. ITU-T H.248.81 (2011)/Amd.2 (04/2015) Page 9 Explicit congestion notification (ECN) and ET
28、S . 11 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-
29、T H.248.81 (2011)/Amd.2 (04/2015) 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 2 DiffServ signalling approach 1 Scope ITU-T H.248.1 defin
30、es 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 defined in ITU-T H.
31、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 the identification of
32、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. The priority indicat
33、or, 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 H.323 and NGN syste
34、ms. 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 this Recommendation. It
35、 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 identification of emergency calls
36、 (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 emergency indicator
37、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. In addition, it describes the DiffServ signalling ITU-T H.248.52 approach for markin
38、g ETS calls/sessions. NOTE 1 National, regional or local emergency and public safety services, 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 signallin
39、g requirements to support the IEPS. It is also applicable for ITU-T H.248 entities, but 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
40、not indicate any requirement in addition to clause 7. 2 Rec. ITU-T H.248.81 (2011)/Amd.2 (04/2015) 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,
41、 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 references listed below. A list of the curre
42、ntly 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 E.106 Recommendation ITU-T E.106 (2003), International Emergency Preference Scheme (IEPS) for disaster re
43、lief operations. ITU-T E.107 Recommendation ITU-T E.107 (2007), Emergency Telecommunications 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 m
44、ultimedia communication systems. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), 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.
45、248.10 Recommendation ITU-T H.248.10 (2001), Gateway control protocol: Media gateway resource congestion handling package. ITU-T H.248.11 Recommendation ITU-T H.248.11 (2013), Gateway control protocol: Media gateway overload control package. ITU-T H.248.32 Recommendation ITU-T H.248.32 (2013), Gatew
46、ay control protocol: Detailed congestion reporting package. ITU-T H.248.52 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.
47、248.56 (2007), Gateway control protocol: Packages for virtual private network 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 notif
48、ication support. ITU-T H.323 Recommendation ITU-T H.323 (2009), Packet-based 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
49、 bearer control International Emergency Preference Scheme. Rec. ITU-T H.248.81 (2011)/Amd.2 (04/2015) 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 disaster and emergencies. 3.2 Terms defined in this Recommendation This Re
