1、 77777 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.248.41 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2015) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services Communication procedures Gateway control protocol: IP domain conne
2、ction package Recommendation ITU-T H.248.41 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.23
3、0H.239 Communication procedures 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 au
4、diovisual and multimedia services 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
5、.510H.519 Mobile multimedia collaboration 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
6、inter-working procedures H.560H.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 AN
7、D 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 metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.7
8、80H.789 E-HEALTH MULTIMEDIA SERVICES 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
9、 Recommendations. Rec. ITU-T H.248.41 (11/2015) i Recommendation ITU-T H.248.41 Gateway control protocol: IP domain connection package Summary Recommendation ITU-T H.248.41 defines certain parameters and mechanisms for supporting the interconnection of a packet network with another network. It is on
10、ly applicable to the IP-based ITU-T H.248 termination and provides such information as the IP Realm Identifier used to indicate to which packet network the media represented by the termination belongs. Amendment 1 to the first edition introduced mechanisms that allow the media gateway controller to
11、discover the IP realms that are available at the media gateway at a certain time. It also introduced a length limitation in the IP realm property. The second edition removed the package extension in the IP Realm Availability package in order to resolve a property identity conflict. This revision rev
12、ises the IP domain connection package to allow multiple realms to be specified in the IP Realm Identifier property. This allows the usage of the property when the ReserveGroup/ ReserveValue mechanism is used to specify different transports. History Edition Recommendation Approval Study Group Unique
13、ID* 1.0 ITU-T H.248.41 2006-05-29 16 11.1002/1000/8820 1.1 ITU-T H.248.41 (2006) Amd. 1 2008-06-13 16 11.1002/1000/9477 2.0 ITU-T H.248.41 2013-03-16 16 11.1002/1000/11860 3.0 ITU-T H.248.41 2015-11-29 16 11.1002/1000/12626 * To access the Recommendation, type the URL http:/handle.itu.int/ in the ad
14、dress 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.248.41 (11/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications,
15、information and communication technologies (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
16、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 dow
17、n 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 indicate both a telecommunication
18、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 when all of these mandatory
19、 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 PROPERTY RIGHTSITU draws attent
20、ion 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
21、outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had 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 la
22、test 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. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.248.41 (11/2015) iii T
23、able of Contents Page 1 Scope . 1 1.1 Specifying the IP realm of an ITU-T H.248 stream . 1 1.2 Auditing the MG supported realms and their availability 1 2 References . 1 3 Terms and definitions . 2 4 Abbreviations and acronyms 2 5 IP Domain Connection Package . 2 5.1 Properties 2 5.2 Events . 3 5.3
24、Signals 3 5.4 Statistics 3 5.5 Error Codes . 3 5.6 Procedures 3 6 IP Realm Availability package . 4 6.1 Properties 4 6.2 Events . 4 6.3 Signals 5 6.4 Statistics 5 6.5 Error codes 5 6.6 Procedures 5 Rec. ITU-T H.248.41 (11/2015) 1 Recommendation ITU-T H.248.41 Gateway control protocol: IP domain conn
25、ection package 1 Scope This Recommendation defines packages and mechanisms for supporting the interconnection of a packet network with another network. The packages defined by this Recommendation are only applicable to IP-based ITU-T H.248 terminations. The packages are therefore applicable for: IP-
26、to-IP ITU-T H.248 media gateways, and IP-to-non-IP ITU-T H.248 media gateways. 1.1 Specifying the IP realm of an ITU-T H.248 stream The media gateway controller (MGC) may specify the IP realm/s that a stream of a particular ITU-T H.248 termination belongs to. This is accomplished through the IP Real
27、m Identifier property of the IP Domain Connection package. 1.2 Auditing the MG supported realms and their availability 1.2.1 Auditing all supported realms The MGC can audit the realms supported by the MG (i.e., all realms that the MG is aware of) by using an AuditCapabilities on the IP Realm Identif
28、ier property of the IP Domain Connection package. 1.2.2 Understanding the availability of realms The IP Realm Availability package extends the IP Domain Connection package. Through an AuditValue of this packages Available Realms property, the MGC is able to learn which of the supported realms is cur
29、rently available (i.e., over which realms the MG can currently send and receive traffic). Similarly, the MGC may request to be notified of changes to the list of available realms through the Available Realms Changed event of the same package. 2 References The following ITU-T Recommendations and othe
30、r 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 subject to revision; users of this Recommendation are therefore encouraged
31、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 within this Recommendation does not give it, as a stand-alone document,
32、 the status of a Recommendation. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway control protocol: Version 3. IETF RFC 1123 IETF RFC 1123 (1989), Requirements for Internet Hosts Application and Support. IETF RFC 2663 IETF RFC 2663 (1999), IP Network Address Translator (NAT) Terminology an
33、d Considerations. 2 Rec. ITU-T H.248.41 (11/2015) 3 Terms and definitions This Recommendation defines the following terms: 3.1 IP address realm or IP realm: Is defined in IETF RFC 2663, clause 2.1, as a network domain in which the network addresses are uniquely assigned to entities such that datagra
34、ms can be routed to them. Routing protocols used within the network domain are responsible for finding routes to entities given their network addresses. 3.2 realm availability (from MG perspective): Realm availability means connectivity on the IP layer to a particular realm. Connectivity implies tha
35、t the MG joins the realm (i.e., network address(es) from that realm are used for ITU-T H.248 IP stream/terminations) and that at least one IP route is available towards another IP node (e.g., IP router, IP host, ITU-T H.248 media gateway) of that realm. 4 Abbreviations and acronyms This Recommendati
36、on uses the following abbreviations and acronyms: IP Internet Protocol IPv4 Internet Protocol Version 4 IPv6 Internet Protocol Version 6 MG Media Gateway MGC Media Gateway Controller SDP Session Description Protocol 5 IP Domain Connection Package Package name: IP Domain Connection Package Package ID
37、: ipdc (0x009d) Description: This package defines certain parameters and mechanisms for supporting the interconnection of a packet network with another network. Version: 2 Extends: None 5.1 Properties 5.1.1 IP Realm Identifier Property name: IP Realm Identifier Property ID: realm (0x0001) Descriptio
38、n: This property is used to indicate to which packet network the media represented by the termination belongs. Type: Sub-list of String Rec. ITU-T H.248.41 (11/2015) 3 Possible values: String Length limitation: Where the IP Realm Identifier property uses a domain name format, it shall handle domain
39、names of up to 63 characters and should handle domain names of up to 255 characters in accordance with clause 2.1 of IETF RFC 1123. There shall be a maximum of two values in the sub-list. NOTE 1 When there are two values, then the two IP realms use different IP versions. Default: Provisioned between
40、 the MGC and the MG. Defined in: LocalControl NOTE 2 When there are two values, then the H.248 Stream Descriptor also contains two ITU-T H.248 media groups (clause 7.1.7.1.2 of ITU-T H.248.1). The media group SDP “c=“-line element provides the binding between IP realm identifier and associated ITU-T
41、 H.248 media group. Characteristics: Read/Write 5.2 Events None. 5.3 Signals None. 5.4 Statistics None. 5.5 Error Codes None. 5.6 Procedures The value of the IP Realm Identifier property is a string, which may be in a domain name format, e.g., ““, or any other string format. In case the MGC uses an
42、ipdc/realm property exceeding the above defined length limitation, the MG shall reply with an error descriptor using error code #449: “Unsupported or Unknown Parameter or Property Value“. Typically an ITU-T H.248 stream belongs to a single IPv4 or IPv6 domain and thus a single IP realm value is used
43、. However, in some scenarios an ITU-T H.248 Stream may belong to both IPv4 and IPv6 domains. In this case, multiple media connection addresses and ports are specified through the use of the ITU-T H.248 ReserveValue/ReserveGroup mechanism. Multiple IP realm values are specified in the ipdc/realm prop
44、erty in the order of the reserved values/reserved groups. I.e., if the first group contains an IPv6 address and the second contains an IPv4 address then the first value in the ipdc/realm property will relate to IPv6 and the second value will relate to IPv4. The IP Realm Identifier should be provisio
45、ned between the MGC and the MG. Each of the different IP realms possibly interconnecting with an MG should have a different identifier. The MGC and the MG can provision a default IP realm and configure it on the MG. If the MGC sends a command to the MG to create an IP-based ITU-T H.248 termination w
46、ithout the IP Realm Identifier property, the MG will consider it as indicating the default realm. 4 Rec. ITU-T H.248.41 (11/2015) If the value of the IP Realm Identifier property sent by the MGC cannot be recognized by the MG, the MG will fail to create the IP-based ITU-T H.248 termination and retur
47、n the corresponding error code to the MGC, e.g., 449 (Unsupported or Unknown Parameter or Property Value). Performing an AuditCapabilities of the ipdc/realm property on the root termination returns all realms defined in the MG, being available or not. Performing an AuditValue of the ipdc/realm prope
48、rty on an IP termination returns the IP realm that the termination is currently connected to. 6 IP Realm Availability package Package name: IP Realm Availability Package ID: ipra (0x00e0) Description: This package defines a new root property and a new root event to enable a discovery mechanism for I
49、P realm availability. Version: 1 Extends: None. 6.1 Properties 6.1.1 Available Realms Property name: Available Realms Property ID: ar (0x0001) Description: This property lists the IP realms which are currently available for usage on request by the MGC. It is applicable on Root terminations only. Type: Sub-list of String Possible values: Strings mutually understood by MG and MGC and which are also addressable through the ipdc/realm property. Default: None Defined in: TerminationState Characteristics: ReadOnly
