1、 International Telecommunication Union ITU-T H.460.20TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2005) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Supplementary services for multimedia Location number within H.323 systems ITU-T Recommendation H.460.20 I
2、TU-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 H.240H.259 Co
3、ding 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 services H.360H.369
4、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 and services H
5、.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-PLAY MULTIMED
6、IA 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.460.20 (09/2005) i ITU-T Recommendation H.460.20 Location number within H.323 systems Summary This Recommendation defines a parameter “LocationSourceAdd
7、ress“ to convey location numbers as a field that carries a sequence of an alias address that matches the Location Number from/to non-H.323 networks. Coming from non-H.323 networks, this field can be inserted by Gateways. Coming from H.323 networks, this field can be inserted by originating Gatekeepe
8、rs. Source ITU-T Recommendation H.460.20 was approved on 13 September 2005 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. H.460.20 (09/2005) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field
9、 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 standardizing telecommunications on a worldwide basis. The Worl
10、d 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 down in WTSA Resolution 1. In
11、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 administration and a recogn
12、ized 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 word
13、s “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
14、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 outside of the Recommendatio
15、n 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, implementors are cautioned that this may not represent the latest information and are
16、 therefore strongly urged to consult the TSB patent database. ITU 2005 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. H.460.20 (09/2005) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Abbreviations 1
17、 4 Feature description 2 4.1 Negotiation of the feature. 2 4.2 Generic data usage 2 4.3 Negotiation of LocationSourceAddress feature . 2 iv ITU-T Rec. H.460.20 (09/2005) Introduction Nowadays more and more telephone numbers do not provide any information on geographic localization of the calling par
18、ty. Although there is a need to have an accurate geographic position, there is also a need to convey already existing information about localization coming from the PSTN. In the PSTN, a parameter is defined to transport a location number coming from a Mobile Network. This parameter (Location Number
19、in ISUP) is also used inside PSTN to give more accurate information on the calling party, when the calling party number cannot be used to provide any geographic information. For example this information is used for IN services like premium services, (free) 800-numbers, emergency services, etc. To be
20、tter interwork with ISUP, this Recommendation proposes a field called LocationSourceAddress which may be added and filled by gatekeepers and gateways. NOTE In this Recommendation, the geographic information provided is only a number conveyed. This number may be a zip code, an E.164 number, a zone nu
21、mber, or whatever the need may be. This parameter should not be used to convey accurate geographical information (such as earth coordinates). ITU-T Rec. H.460.20 (09/2005) 1 ITU-T Recommendation H.460.20 Location number within H.323 systems 1 Scope In the case of Voice over IP trunking (H.323 networ
22、k is between two PSTN networks), since the distant PSTN network may need the location number parameter, H.323 should convey the location number present in ISUP. Otherwise this information is lost at the interworking edge. In the case of an IP to PSTN call in a GK routed model, the originating GK (wh
23、ere the terminal is registered to) should be able to add a location number when the calling party number does not provide any information on the geographic location of the calling party. This information is needed by the PSTN for emergency services for billing and for routing the call. In the case o
24、f a PSTN to IP call, in a GK routed model, H.323 should have a field to convey the location number provided by ISUP networks. As a matter of fact, some H.323 application servers need more precise information on the calling party for emergency services for billing and for routing the call. This Recom
25、mendation proposes a parameter “LocationSourceAddress“ to convey the location number. NOTE Location number in the Service Channel Network (SCN) is specified in ITU-T Rec. Q.763. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this
26、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 to investigate the possibility of applying the most recent editio
27、n 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, the status of a Recommendation. ITU-T Recommendation H.225.0 (20
28、03), Call signalling protocols and media stream packetization for packet-based multimedia communication systems. ITU-T Recommendation H.245 (2005), Control protocol for multimedia communication. ITU-T Recommendation H.323 (2003), Packet-based multimedia communication systems. ITU-T Recommendation H.
29、460.1 (2002), Guidelines for the use of the Generic Extensible Framework. ITU-T Recommendation Q.763 (1999), Signalling System No. 7 ISDN user part formats and codes. 3 Abbreviations This Recommendation uses the following abbreviations: GEF Generic Extensible Framework GK Gatekeeper SCN Service Chan
30、nel Network 2 ITU-T Rec. H.460.20 (09/2005) 4 Feature description 4.1 Negotiation of the feature Usage of the LocationSourceAddress feature is negotiated between Gateways and Gatekeepers and/or between Gatekeepers at call set-up time. For this purpose, Gateways or Gatekeepers that support this featu
31、re shall include the feature descriptor defined in 4.3 (see Table 1 below) when they issue a SETUP message. The SETUP shall contain a request for LocationSourceAddress feature support in the desiredFeatures or supportedFeatures element. The neededFeatures element should not be used to request this f
32、eature as it should be optional. In addition, the SETUP message shall include a genericData element specifying LocationSourceAddress (parameter 1). The receiving party should not acknowledge the acceptance of the LocationSourceAddress feature as there is no associated procedure to apply at the calli
33、ng party if this feature is not supported by the called party. 4.2 Generic data usage The Generic Extensible Framework (GEF) shall be used to convey the LocationSourceAddress as described in tabular form below. 4.3 Negotiation of LocationSourceAddress feature The LocationSourceAddress feature will b
34、e negotiated as a Generic Extensible Framework as described in ITU-T Rec. H.323 (2003). The FeatureDescriptor for LocationSourceAddress Feature will be a GenericData element with a standard GenericIdentifier of value 20: Table 1/H.460.20 LocationSourceAddress feature Feature Name: LocationSourceAddr
35、ess Feature Feature Description: This feature permits the use of LocationSourceAddress elements. Feature Identifier Type: Standard Feature Identifier Value: 20 The following subfeature parameters are defined for the LocationSourceAddress feature. The parameters are used within a genericData list in
36、ITU-T Rec. H.225.0 call signalling messages in order to indicate or invoke the corresponding feature/request. Table 2/H.460.20 LocationSourceAddress parameter Parameter Name: LocationSourceAddress Parameter Description: This field is an ASN.1-PER encoded ExtendedAliasAddress. Parameter Identifier Ty
37、pe: Standard Parameter Identifier Value: 1 Parameter Type: Raw Parameter cardinality: zero or once Printed in Switzerland Geneva, 2005 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,
38、service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems 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,
39、 sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sou
40、nd programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Seri
41、es 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
