ISO IEC 23289-2002 Information technology - Telecommunications and information exchange between systems - Corporate telecommunication networks Signalling interw.pdf

1、 Reference number ISO/IEC 23289:2002(E) ISO/IEC 2002INTERNATIONAL STANDARD ISO/IEC 23289 First edition 2002-12-15Information technology Telecommunications and information exchange between systems Corporate telecommunication networks Signalling interworking between QSIG and H.323 Basic services Techn

2、ologies de linformation Tlcommunications et change dinformation entre systmes Rseaux de tlcommunications corporatifs Interaction de signalisation entre QSIG et H.323 Services de base ISO/IEC 23289:2002(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensin

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5、aken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO/IEC 2002 All rights reserved. Unless otherwise specified, no part of this publication may be repr

6、oduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22

7、749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2002 All rights reservedISO/IEC 23289:2002(E) ISO/IEC 2002 All rights reserved iiiContents Foreword v Introduction vi 1 Scope 1 2 Conformance 1 3 Normative references 1 4 Definitions 2 4.1 Ext

8、ernal definitions 2 4.2 Other definitions 2 4.2.1 Gateway 2 4.2.2 IP network 2 4.2.3 Ring-back tone 2 5 Acronyms 2 6 Architecture 3 7 General requirements 4 8 Message mapping requirements 4 8.1 Message validation and handling of protocol errors 4 8.2 Call establishment from QSIG to H.323 5 8.2.1 Cal

9、l establishment from QSIG to H.323 using admission procedures 5 8.2.2 Call establishment from QSIG to H.323 without admission procedures 8 8.3 Call establishment from H.323 to QSIG 11 8.3.1 Receipt of an H.225.0 SETUP message 11 8.3.2 Additional messages relating to overlap sending 12 8.3.3 Receipt

10、of a QSIG CALL PROCEEDING message 12 8.3.4 Receipt of a QSIG ALERTING message 12 8.3.5 Receipt of a QSIG CONNECT message 12 8.4 PROGRESS messages and Progress indicator information elements 13 8.4.1 Receipt of a Progress indicator information element in a QSIG message 13 8.4.2 Receipt of a Progress

11、indicator information element in an H.225.0 message 13 8.4.3 Transmission of Progress indicator information element in support of gateway-provided ring-back tone 13 8.5 Call clearing 13 8.5.1 Call clearing initiated by QSIG 13 8.5.2 Call clearing initiated by H.323 13 9 Numbering requirements 13 9.1

12、 Supported numbering plans and types of number 13 9.2 Mapping numbers from QSIG to H.323 14 9.3 Mapping numbers from H.323 to QSIG 14 9.4 Handling of presentation and screening indicators 15 9.5 Handling of subaddresses 15 10 Security requirements 15 ISO/IEC 23289:2002(E) iv ISO/IEC 2002 All rights

13、reserved11 Requirements for support of basic services 15 11.1 Calls from QSIG to H.323 16 11.2 Calls from H.323 to QSIG 16 12 Media channel establishment 17 13 Requirements for the support of group 3 fax in accordance with H.323 annex D 17 13.1 Start of fax transmission 17 13.2 End of fax transmissi

14、on 18 14 Requirements for the support of DTMF 18 15 Requirements for the provision of ring-back tone 18 Annexes A - Implementation Conformance Statement (ICS) proforma 19 B - Example message sequences 34 ISO/IEC 23289:2002(E) ISO/IEC 2002 All rights reserved vForeword ISO (the International Organiza

15、tion for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respec

16、tive organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of informatio

17、n technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International S

18、tandards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be t

19、he subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 23289 was prepared by ECMA (as ECMA-332) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in paral

20、lel with its approval by national bodies of ISO and IEC. ISO/IEC 23289:2002(E) vi ISO/IEC 2002 All rights reservedIntroduction This International Standard is one of a series of Standards defining the interworking of services and signalling protocols deployed in corporate telecommunication networks (

21、CNs). The series uses telecommunication concepts as developed by ITU-T and conforms to the framework of International Standards on Open Systems Interconnection as defined by ISO/IEC. This International Standard defines the signalling protocol interworking for basic services between a Private Integra

22、ted Services Network (PISN) and a packet-based private telecommunications network based on the Internet Protocol (IP). It is further assumed that the protocol for the PISN part is that defined for the Q reference point (QSIG) and that the protocols for the IP-based network are based on ITU-T Recomme

23、ndation H.323. This International Standard is based upon the practical experience of ECMA member companies and the results of their active and continuous participation in the work of ISO/IEC JTC 1, ITU-T, ETSI and other international and national standardization bodies. It represents a pragmatic and

24、 widely based consensus. INTERNATIONAL STANDARD ISO/IEC 23289:2002(E) ISO/IEC 2002 All rights reserved 1Information technology - Telecommunications and information exchange between systems - Corporate telecommunication networks - Signalling interworking between QSIG and H.323 - Basic services 1 Scop

25、e This International Standard specifies signalling interworking between “QSIG” and “H.323” in support of basic services within a corporate telecommunication network (CN). “QSIG” is a signalling protocol that operates at the Q reference point between Private Integrated services Network eXchange (PINX

26、) within a Private Integrated Services Network (PISN). The Q reference point is defined in ISO/IEC 11579-1. A PISN provides circuit-switched basic services and supplementary services to its users. QSIG is specified in other International Standards, in particular ISO/IEC 11572 (call control in suppor

27、t of basic services). “H.323” is a set of signalling protocols for the support of voice or multimedia communication within a packet network, in particular a packet network that uses the Internet Protocol (IP) as its network layer protocol (IP network). H.323 signalling protocols operate between endp

28、oints in an IP network, either indirectly via one or more gatekeepers, or directly. An endpoint can be a terminal or a gateway to another network. H.323 is an “umbrella” recommendation referring to various ITU-T recommendations, in particular recommendations H.225.0 and H.245 (basic communication ca

29、pabilities). This International Standard specifies signalling interworking for basic services that provide a bidirectional transfer capability for speech, DTMF, facsimile and modem media between a PISN employing QSIG and a private IP network employing H.323. This International Standard specifies req

30、uirements for establishing user information (audio) connections between the PISN and the IP network, but protocols for transmitting audio in the IP network and for signalling in order to establish and close down audio transmission in the IP network are outside the scope of this International Standar

31、d. Supplementary services are outside the scope of this International Standard. Interworking between QSIG and H.323 permits a call originating at a user of a PISN to terminate at a user of a private IP network, or a call originating at a user of a private IP network to terminate at a user of a PISN.

32、 Interworking between a PISN employing QSIG and a public IP network employing H.323 is outside the scope of this International Standard. However, the functionality specified in this International Standard is in principle applicable to such a scenario when deployed in conjunction with other relevant

33、functionality (e.g., number translation, security functions, etc.). Although two such gateways can operate as peers on either side of an IP network (whereby the IP network provides interconnection between two PISNs), special support for this situation (e.g., tunnelling of QSIG information through th

34、e IP network) is outside the scope of this International Standard. Although two such gateways can operate as peers on either side of a PISN (whereby the PISN provides interconnection between two IP networks), special support for this situation (e.g., tunnelling of H.323 information through the PISN)

35、 is outside the scope of this International Standard. This International Standard is applicable to any interworking unit that can act as a gateway between a PISN employing QSIG and a private IP network employing H.323. 2 Conformance In order to conform to this International Standard, a gateway shall

36、 satisfy the requirements identified in the Implementation Conformance Statement (ICS) proforma in annex A. 3 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references,

37、the latest edition of the referenced document (including any amendments) applies. ISO/IEC 11571:1998, Information technology - Telecommunications and information exchange between systems - Private Integrated Services Networks - Addressing ISO/IEC 23289:2002(E) ISO/IEC 11572:2000, Information technol

38、ogy - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit mode bearer services - Inter-exchange signalling procedures and protocol ISO/IEC 11579-1:1994, Information technology - Telecommunications and information exchange between systems - Priv

39、ate integrated services network - Part 1: Reference configuration for PISN Exchanges (PINX) ISO/IEC 17310:2000, Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Mapping functions for the employment of 64 kbit/s circuit mode

40、connections with 16 kbit/s sub- multiplexing ISO/IEC 17311:2000, Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Mapping functions for the employment of 64 kbit/s circuit mode connections with 8 kbit/s sub- multiplexing ISO

41、/IEC 21409:2001; Information technology - Telecommunications and information exchange between systems - Corporate telecommunication networks - Signalling interworking between QSIG and H.323 - Generic functional protocol for the support of supplementary services ITU-T Rec. H.225.0 version 4, Call sig

42、nalling protocols and media stream packetization for packet-based multimedia communication systems (11/2000) ITU-T Rec. H.235 version 2, Security and encryption for H-Series (H.323 and other H.245-based) multimedia terminals (11/2000) ITU-T Rec. H.245 version 7, Control protocol for multimedia commu

43、nication (11/2000) ITU-T Rec. H.323 version 4, Packet-based multimedia communications systems (11/2000) 4 Definitions For the purposes of this document, the following definitions apply. 4.1 External definitions This International Standard uses the following terms defined in other documents: Call (IS

44、O/IEC 21409) Corporate telecommunication network (CN) (ISO/IEC 21409) Endpoint (ITU-T Rec. H.323) Gatekeeper (ITU-T Rec. H.323) Private Integrated Services Network (PISN) (ISO/IEC 21409) Private Integrated services Network eXchange (PINX) (ISO/IEC 11579-1) Additionally the definitions in ISO/IEC 115

45、72 and ITU-T Recommendation H.323 apply as appropriate. 4.2 Other definitions 4.2.1 Gateway A gateway as defined in H.323 specifically for the purpose of interworking with a network employing QSIG. 4.2.2 IP network A network, unless otherwise stated a CN, offering connectionless packet-mode services

46、 based on the Internet Protocol (IP) as the network layer protocol. 4.2.3 Ring-back tone An in-band tone or announcement played to the calling user during the alerting of the called user. 5 Acronyms CN Corporate telecommunication network ICS Implementation Conformance Statement IP Internet Protocol

47、2 ISO/IEC 2002 All rights reserved ISO/IEC 23289:2002(E) PINX Private Integrated services Network eXchange PISN Private Integrated Services Network 6 Architecture This International Standard specifies signalling protocol interworking aspects of a gateway between a PISN employing QSIG signalling and

48、an IP network employing H.323 signalling. The gateway appears as a PINX to other PINXs in the PISN. The gateway appears as an H.323 endpoint to other H.323 entities in the IP network, these being: other endpoints (terminals, gateways or multipoint control units) that originate calls via the gateway

49、to the PISN and terminate calls via the gateway from the PISN; gatekeepers, including the gatekeeper with which the gateway registers and other gatekeepers involved in call routing. This environment is illustrated in figure 1. IP network PISN Inter-PINX link Gateway PINX End- point End- point Gate- keeper s PINX PINXFigure 1 Environment In addition to the signalling interworking functionality specified in this International Standard, it is assumed that the gateway also includes the following functionality: one or