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 Series H TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 13 (10/2015) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Gateway control protocol: Common ITU-T H.248 terminology Release 2 ITU-T H-series Recommendations
2、 Supplement 13 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 procedur
3、es 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 serv
4、ices H.360H.369 Telepresence H.420H.429 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 c
5、ollaboration applications and 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.559 Mobile multimedia collaboration inter-working procedures H.56
6、0H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services 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 Gener
7、al aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV middleware H.730H.739 IPTV application 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 S
8、ERVICES AND APPLICATIONS Personal health systems H.810H.819 Interoperability compliance testing of personal health systems (HRN, 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. H series Su
9、pplement 13 (10/2015) i Supplement 13 to ITU-T H-series Recommendations Gateway control protocol: Common ITU-T H.248 terminology Release 2 Summary Supplement 13 to the ITU-T H-series Recommendations provides a repository for ITU-T H.248 related terms that concern multiple ITU-T H.248.x Recommendatio
10、ns, Supplements, or the entire ITU-T H.248.x-series. This Supplement is a living document. Release 2 adds further terms related to ITU-T X.200 | ISO/IEC 7498-1, as well as general naming conventions and protocol layer notations. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-
11、T H Suppl. 13 2015-10-23 16 11.1002/1000/12684 Keywords Gateway control protocol, ITU-T H.248. _ * 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/11.1002/1000/1183
12、0-en. ii H series Supplement 13 (10/2015) 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 o
13、rgan 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 th
14、e 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-Ts purview, the necessary standards ar
15、e prepared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this publication is voluntary. However, the publication may c
16、ontain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the publication 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
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19、operty, protected by patents, which may be required to implement this publication. 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 2016 All rights reserved.
20、 No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. H series Supplement 13 (10/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Supplement 2 4 Abbrev
21、iations and acronyms 2 5 Conventions in ITU-T H.248.x-Recommendations 3 5.1 Protocol layer notation . 3 5.2 Naming conventions for “connection“ objects . 3 5.3 Naming conventions for “endpoint“ objects . 3 5.4 Protocol stack notation . 3 6 Handling of new terms 3 Bibliography. 4 iv H series Suppleme
22、nt 13 (10/2015) Introduction All ITU-T Recommendations relating to the ITU-T defined gateway control protocol (GCP) are published within the ITU-T H.248.x-series of Recommendations. The core protocol itself is defined by ITU-T H.248.1. Protocol extensions (in the form of so-called ITU-T H.248 packag
23、es) and other material (such as profile guidelines) are the subject of self-contained Recommendations within the ITU-T H.248.x-series, see ITU-T H.248.x. Basically, all of these GCP-related Recommendations (plus some Supplements) share the same terminology. The set of GCP terms were historically div
24、ided in two classes: general GCP terms and package-specific GCP terms. The general terms with global GCP scope are the subject of the core protocol specification, see ITU-T H.248.1, whereas package specific terms are typically located in the related ITU-T H.248.x-series Recommendations, see Figure 1
25、. Figure 1 Positioning of ITU-T H.Sup.13 versus the ITU-T H.248.x-series of Recommendations When defining terms there are two basic issues: 1) the terms may affect multiple ITU-T H.248 documents, but not the entire series, leading to the question of the appropriate place for such terminology; and 2)
26、 the addition of new, global ITU-T H.248 terms would imply a revision of ITU-T H.248.1, which may not be desirable for a single term. This Supplement acts as a repository for such GCP-related terminology to alleviate the above issues. H series Supplement 13 (10/2015) 1 Supplement 13 to ITU-T H-serie
27、s Recommendations Gateway control protocol: Common ITU-T H.248 terminology Release 2 1 Scope Within the scope of this Supplement are GCP-related terms that relate to multiple ITU-T H.248 documents. Outside the scope of this Supplement are: terms not related to ITU-T H.248 technology; terms which aff
28、ect a single ITU-T H.248.x Recommendation. Release 2 adds: terms related to ITU-T X.200; naming conventions and protocol layer notations. 2 References ITU-T H.248.x ITU-T H.248.x-series of Recommendations, Gateway Control Protocol. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway control p
29、rotocol: Version 3. ITU-T X.200 Recommendation ITU-T X.200 (1994) | ISO/IEC 7498-1:1994, Information technology Open Systems Interconnection Basic Reference Model: The basic model. IETF RFC 1136 IETF RFC 1136 (1989), Administrative Domains and Routing Domains. A Model for Routing in the Internet. 3
30、Definitions 3.1 Terms defined elsewhere In addition to the basic GCP terms defined by clause 3.2 of ITU-T H.248.1, this Supplement uses the following terms defined elsewhere. 3.1.1 ISO end system IETF RFC 1136: End System (ES): An OSI system on which applications run. An end system has full seven-la
31、yer OSI functionality. Basically equivalent to an Internet host. 3.1.2 (N)-association ITU-T X.200, clause 5.3.1.1: A cooperative relationship among (N)-entity-invocations. NOTE The (DTLS)-association b-ITU-T H.248.93 and the (SCTP)-association b-ITU-T H.248.97 relates to the concept of a (N)-connec
32、tion, but not an (N)-association. 3.1.3 (N)-connection ITU-T X.200, clause 5.3.1.2: An association requested by an (N+1)-entity for the transfer of data between two or more (N+1)-entities. The association is established by the (N)-layer and provides explicit identification of a set of (N)-data-trans
33、missions and agreement concerning the (N)-data-transmission services to be provided for the set. 3.1.4 (N)-connection-endpoint ITU-T X.200, clause 5.3.1.3: A terminator at one end of an (N)-connection within an (N)-service-access-point. 2 H series Supplement 13 (10/2015) 3.1.5 (N)-connection-endpoin
34、t-identifier ITU-T X.200, clause 5.4.1.5: An identifier of an (N)-connection-endpoint which can be used to identify the corresponding (N)-connection at an (N)-service-access-point. 3.1.6 multiplexing ITU-T X.200, clause 5.8.1.4: A function performed by an (N)-entity in which one (N1)-connection is u
35、sed to support more than one (N)-connection. NOTE The term multiplexing is also used in a more restricted sense to refer to the function performed by the sending (N)-entity while the term demultiplexing is used to refer to the function performed by the receiving (N)-entity. 3.2 Terms defined in this
36、 Supplement This Supplement defines the following terms: 3.2.1 endpoint: For the purpose of the ITU-T H.248 series of Recommendations, an endpoint is an entity that generates and/or terminates information streams. The term endpoint may be further qualified by prefixes or suffixes to provide more det
37、ail on the type of endpoint. NOTE An endpoint is equivalent to an open systems interconnection (OSI) end system. 3.2.2 media gateway: The two coupled functional entities of an ITU-T H.248 media gateway (MG) entity (see clause 3.2.3 of ITU-T H.248.1) and its associated ITU-T H.248 media gateway contr
38、oller (MGC) entity (see clause 3.2.4 of ITU-T H.248.1). NOTE The ITU-T H.248 gateway represents a specific decomposition model in splitting an original monolithic user/control plane related network element into two, plane specific network elements (MG and MGC), interconnected by the ITU-T H.248 prot
39、ocol. 3.2.3 master-slave control relationship: The ITU-T H.248 decomposed gateway follows a hierarchical control model in the network control plane (primarily related to call service control and media/bearer control functions). The control hierarchy constitutes a master-slave relationship, with the
40、MGC as master and the MG as the slave entity. NOTE Annexes C.2 or C.3 of b-ITU-T Q.Sup31 and b-ITU-T Q.Sup32 provide examples of functional-to-physical mapping models according to the ITU-T H.248 master-slave control relationship. 3.2.4 media gateway (MG) autonomous mode: For a particular function,
41、the MGC delegates some (but not all) service specific control decisions down to the MG level. The MG provides a local decision function. The MG autonomous control is limited to decisions with MG available information only. 3.2.5 media gateway controller (MGC) strictly controlled mode: For a particul
42、ar function, the control decisions are exclusively under MGC responsibility, the MG degenerates to a pure execution unit. 3.2.6 stream endpoint tuple (SEPT): The generalization of a stream endpoint pair (SEPP) towards multiple associated stream endpoints (SEPs) within the same context. All SEPs shar
43、e the same StreamID value. The stream topology is given by the topology descriptor settings. 4 Abbreviations and acronyms This Supplement uses the following abbreviations and acronyms: DTLS Datagram Transport Layer Security ES End System GCP Gateway Control Protocol MG Media Gateway H series Supplem
44、ent 13 (10/2015) 3 MGC Media Gateway Controller OSI Open Systems Interconnection SEP Stream Endpoint SEPP Stream Endpoint Pair SEPT Stream Endpoint Tuple TLS Transport Layer Security 5 Conventions in ITU-T H.248.x-Recommendations 5.1 Protocol layer notation The (N)-, (N+1)- and (N1)-notation and nam
45、ing scheme for individual layers and sublayers is used in ITU-T H.248.x Recommendations for naming according to clause 3 of ITU-T X.200. 5.2 Naming conventions for “connection“ objects The ITU-T X.200 (N)-connection entity relates basically to the concept of an ITU-T H.248 bearer or bearer connectio
46、n. ITU-T H.248.x-Recommendations may use the (N)-connection naming scheme in order to qualify the type of connection. 5.3 Naming conventions for “endpoint“ objects The use of the term “endpoint“ in ITU-T H.248.x-Recommendations may be further qualified by using the ITU-T X.200 notation of (N)-endpoi
47、nts. This is used to provide more detail on the type of endpoint. Examples: abstract ITU-T H.248 bearer endpoint: (N)-connection-endpoint, (N)-relay-endpoint; transport layer security (TLS): (TLS)-session-endpoint, (TLS)-connection-endpoint. 5.4 Protocol stack notation When representing the layers o
48、f a protocol stack, ITU-T H.248 series Recommendations in general follow the convention that a protocol layer is represented to the left of its lower protocol layer separated by a / character (i.e., notation such as (N+1)/(N)/(N-1). However some ITU-T H.248 series Recommendations do follow the IETF
49、RFC convention where a protocol layer is represented to the right of its lower protocol layer (i.e., notation such as (N-1)/(N)/(N+1). 6 Handling of new terms A new ITU-T H.248.x-Recommendation under development identifies new terminology. Such terms are normally the subject of ITU-T H.248.x clause 3.2 definitions according to the Recommendation template. When defining new terms, it has to be decided whether a new term is only l
