1、Reference number ISO/IEC 21409:2001(E) ISO/IEC 2001 INTERNATIONAL STANDARD ISO/IEC 21409 First edition 2001-08-15 Information technology Telecommunications and information exchange between systems Corporate telecommunication networks Signalling interworking between QSIG and H.323 Generic functional
2、protocol for the support of supplementary services Technologies de linformation Tlcommunications et change dinformation entre systmes Rseaux de tlcommunications corporatifs Signalisation de travail entre QSIG et H.323 Protocole fonctionnel gnral pour le support des services supplmentairesISO/IEC 214
3、09:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading
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6、low. ISO/IEC 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced 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
7、body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO/IEC 2001 All rights reserved ISO/IEC 21409:2001(E) ISO/IEC 2001 All rights reserved iii Conten
8、ts Foreword iv Introduction v 1 Scope 1 2 Conformance 1 3 Normative references 1 4 Definitions 2 4.1 External definitions 2 4.2 Other definitions 2 4.2.1 Call, Basic call 2 4.2.2 Corporate telecommunication Network (CN) 2 4.2.3 Gateway 2 4.2.4 IP network 2 4.2.5 Private Integrated Services Network (
9、PISN) 2 4.2.6 Receiving side 2 4.2.7 Sending side 2 4.2.8 Side 2 5 Acronyms 2 6 Service description 3 6.1 The architecture of the two networks 3 6.2 Generic procedures: Capabilities 4 6.3 Protocol model 5 6.4 Interworking of supplementary services 6 7 Protocol interworking Messages and information e
10、lements 7 8 Protocol interworking Content of information elements 8 8.1 Content mapping from QSIG to H.323 8 8.2 Content mapping from H.323 to QSIG 9 8.3 Mapping of generic elements 10 8.3.1 Mapping of addressing elements from QSIG to H.323 10 8.3.2 Mapping of addressing elements from H.323 to QSIG
11、12 8.3.3 Mapping of embedded information elements 13 8.3.4 Mapping of manufacturer specific information from QSIG to H.323 13 8.3.5 Mapping of manufacturer specific information from H.323 to QSIG 13 8.3.6 Mapping of names from QSIG to H.323 13 8.3.7 Mapping of names from H.323 to QSIG 14 8.4 Handlin
12、g of ROSE APDUs 14 Annex A - ICS Proforma 15ISO/IEC 21409:2001(E) iv ISO/IEC 2001 All rights reserved Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies t
13、hat are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other inter
14、national organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. In the field of information technology, ISO and IEC have established a joint t
15、echnical committee, ISO/IEC JTC 1. Draft International Standards 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 possibi
16、lity that some of the elements of this International Standard may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. International Standard ISO/IEC 21409 was prepared by ECMA (as ECMA-307) and was adopted, under a special “fast-t
17、rack procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by national bodies of ISO and IEC. Annex A forms a normative part of this International Standard.ISO/IEC 21409:2001(E) ISO/IEC 2001 All rights reserved v Introduction This International
18、 Standard is one of a series of Standards defining the interworking of services and signalling protocols deployed in Corporate telecommunication Networks (CNs). The series uses telecommunication concepts as developed by ITU-T and conforms to the framework of International Standards on Open Systems I
19、nterconnection as defined by ISO/IEC. This International Standard defines the signalling protocol interworking for the generic functional procedures in support of Supplementary Services and/or Additional Network Features (ANFs) between a Private Integrated Services Network (PISN) and a private telec
20、ommunications network based on the Internet Protocol (IP). It is further assumed that the protocol for the PISN is that defined for the Q reference point (QSIG) and the protocols for the IP based network are based on ITU-T Recommendation H.323. This International Standard is based upon the practical
21、 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 widely based consensus.INTERNATIONAL STANDARD ISO/IEC 21409:2001(E) I
22、SO/IEC 2001 All rights reserved 1 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 1S c o p e This International
23、 Standard specifies signalling interworking between “QSIG” and “H.323” in support of generic functional procedures for supplementary services within a Corporate telecommunication Network (CN). “QSIG” is a signalling protocol that operates at the Q reference point between Private Integrated Services
24、eXchanges (PINX) 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 Standards, in particular ISO/IEC 11572 (call control in suppo
25、rt of basic services), ISO/IEC 11582 (generic functional protocol for the support of supplementary services) and a number of standards specifying individual supplementary services. “H.323” is a set of signalling protocols for the support of voice or multimedia communication within a packet network,
26、in particular a packet network that uses the Internet Protocol (IP) as its network layer protocol (IP network). H.323 signalling protocols operate between endpoints in an IP network, either indirectly via one or more gatekeepers, or directly. An endpoint can be a terminal or a gateway to another net
27、work. H.323 is an “umbrella” recommendation, referring to various ITU-T recommendations, in particular Recommendations H.225.0 and H.245 (basic communication capabilities) and Recommendation H.450.1 (generic functional protocol for the support of supplementary services). NOTE - H.450.1 applies to th
28、e 1998 version of H.323 (also known as H.323 version 2) and to later versions. Interworking between QSIG and H.323 permits a call originating at a user of a PISN to terminate at a user of an IP network, or a call originating at a user of an IP network to terminate at a user of a PISN. In addition th
29、is International Standard enables the participants of a call to exchange supplementary service control information in a generic way. The more specific aspects of interworking particular supplementary services are specified in other Standards. This International Standard is applicable to any interwor
30、king unit that can act as a gateway between a PISN employing QSIG and an IP network employing H.323. 2 Conformance In order to conform to this International Standard, a gateway shall satisfy the requirements identified in the Implementation Conformance Statement (ICS) proforma in annex A. 3 Normativ
31、e references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based
32、 on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of curren
33、tly valid International Standards. ISO/IEC 11572:2000, Information technology 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 Te
34、lecommunications and information exchange between systems Private integrated services network Part 1: Reference configuration for PISN Exchanges (PINX) ISO/IEC 11582:1995, Information technology Telecommunications and information exchange between systems Private Integrated Services Network Generic f
35、unctional protocol for the support of supplementary services Inter-exchange signalling procedures and protocol ITU-T Rec. H.225.0:1998 (or later edition), Call signalling protocols and media stream packetization for packet-based multimedia communication systemsISO/IEC 21409:2001(E) 2 ISO/IEC 2001 Al
36、l rights reserved ITU-T Rec. H.245:1998 (or later edition), Control protocol for multimedia communication ITU-T Rec. H.323:1998 (or later edition), Packet-based multimedia communications systems ITU-T Rec. H.450.1:1998, Generic functional protocol for the support of supplementary services in H.323 4
37、 Definitions For the purposes of this International Standard, the following definitions apply. 4.1 External definitions This International Standard uses the following terms defined in other documents: Endpoint (ITU-T Rec. H.323) Gatekeeper (ITU-T Rec. H.323) Private Integrated services Network eXcha
38、nge (PINX) (ISO/IEC 11579-1) Switched Circuit Network (SCN) (ITU-T Rec. H.323) Additionally the definitions of ISO/IEC 11582 and of ITU-T Rec. H.450.1 shall apply, as appropriate. 4.2 Other definitions 4.2.1 Call, Basic call : A call in the sense of QSIG (see ISO/IEC 11572), and a (point-to-point) c
39、onference in the sense of H.323 (see ITU-T Rec. H.323). NOTE - A “call” in the sense of H.323 is that segment of a (point-to-point) conference which belongs to the H.323 domain. In a multipoint conference the H.323 segment of each conference leg is a separate call. 4.2.2 Corporate telecommunication
40、Network (CN) : Sets of equipment Customer Premises Equipment and/or Customer Premises Networks which are located at geographically dispersed locations and are interconnected to provide telecommunication services to a defined group of users. NOTE - A CN can comprise a PISN, a private IP network (intr
41、anet), or a combination of the two. 4.2.3 Gateway : A gateway as defined in H.323, here specifically for the purpose of interworking with a network employing QSIG. 4.2.4 IP network : A public or private network offering connectionless packet-mode services based on the Internet Protocol (IP) as the n
42、etwork layer protocol. 4.2.5 Private Integrated Services Network (PISN) : A private switched circuit network (SCN). 4.2.6 Receiving side : Within the context of a single information exchange through a gateway, the side of the gateway where the information arrives. 4.2.7 Sending side : Within the con
43、text of a single information exchange through a gateway, the side of the gateway where the information is transmitted. 4.2.8 Side : A single protocol stack (QSIG or H.323) within a gateway. 5 Acronyms APDU Application Protocol Data Unit ASE Application Service Element CN Corporate telecommunication
44、Network GFT Generic Functional Transport GK GateKeeper ICS Implementation Conformance Statement IE Information Element IP Internet Protocol IPL Inter-PINX Link IWF InterWorking FunctionISO/IEC 21409:2001(E) ISO/IEC 2001 All rights reserved 3 LAN Local Area Network MCU Multipoint Control Unit PINX Pr
45、ivate Integrated services Network eXchange PISN Private Integrated Services Network ROSE Remote Operations Service Element SCM Signalling Carriage Mechanism SCN Switched Circuit Network SS Supplementary Service TCP Transmission Control Protocol TE Terminal Equipment UDP User Datagram Protocol 6 Serv
46、ice description 6.1 The architecture of the two networks An H.323 arrangement consists of two or more H.323 endpoints connected to an IP network, e.g. a local area network (LAN). H.323 endpoints are terminals, gateways or multipoint control units (MCU). The arrangement may also contain one or more g
47、atekeepers (GK). The underlying networks components (routers etc.), however, are of no concern with regard to H.323. A gateway permits interworking with switched circuit networks (SCN), e.g. a PISN. Gatekeeper Terminal Gateway LAN SCN Terminal Figure 1 Example of an H.323 arrangement A Private Integ
48、rated Services Network (PISN) consists of one or more network exchanges (PINX) with attached terminals (TE). PINXs are inter-connected by inter-PINX links (IPLs). Communication requires a path to be set up between two TEs via PINXs and IPLs.ISO/IEC 21409:2001(E) 4 ISO/IEC 2001 All rights reserved IP
49、L IPL IPL IPL TE TE PINX A PINX B PINX C PINX D Figure 2 Example of a PISN connection between two terminals Comparing the two scenarios, the most significant difference is the absence of nodal entities in the H.323 case. Communication is an exchange of information packets directly between two or more endpoints: A gatekeeper, if present, has certain assisting tasks, but does not switch any payload channels. It may, however, relay signall
