1、 Reference number ISO/IEC 21991:2002(E) ISO/IEC 2002INTERNATIONAL STANDARD ISO/IEC 21991 First edition 2002-06-15 Information technology Telecommunications and information exchange between systems Corporate Telecommunication Networks Signalling interworking between QSIG and H.323 Call completion sup
2、plementary services Technologies de linformation Tlcommunications et change dinformation entre systmes Rseaux de tlcommunications de corps Travail de signalisation entre QSIG et H.323 Complments de service dachvement dappel ISO/IEC 21991:2002(E) PDF disclaimer This PDF file may contain embedded type
3、faces. 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 this file, parties accept therein the responsibility of not infri
4、nging Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were opti
5、mized for printing. Every care has been taken 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
6、, 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 body in the country of the requester. ISO copyright office Case p
7、ostale 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 2002 All rights reservedISO/IEC 21991:2002(E) ISO/IEC 2002 All rights reserved iiiContents Page Foreword v Introduction vi 1 Scope 1 2 Conformance 1 3 Norm
8、ative references 1 4 Definitions 2 4.1 External definitions 2 4.2 Other definitions 2 4.2.1 Entity A 2 4.2.2 Entity B 2 4.2.3 Gateway 2 4.2.4 IP network 2 4.2.5 Leg A 2 4.2.6 Scenario A1 2 4.2.7 Scenario A2 2 5 Acronyms 3 6 Service architecture 3 6.1 Service architecture for invocation and operation
9、 3 6.1.1 ISO/IEC 13870 service architecture 3 6.1.2 H.450.9 service architecture 4 6.1.3 Scenarios for interworking 4 6.1.4 Selection of the same gateway for all phases 4 6.2 Options 4 7 Protocol interworking General requirements 5 8 Protocol interworking Messages and APDUs 5 8.1 Signalling phase 1
10、- invocation of call completion 5 8.1.1 Scenario A1 5 8.1.2 Scenario A2 6 8.2 Signalling phase 2 user B available notification 6 8.2.1 Scenario A1 7 8.2.2 Scenario A2 8 8.3 Signalling phase 3 CC call establishment 9 8.3.1 Scenario A1 9 8.3.2 Scenario A2 9 8.4 Signalling phase 4 cancellation of SS-CC
11、 9 8.4.1 Scenario A1 10 8.4.2 Scenario A2 10 9 Protocol interworking content of APDUs 10 9.1 APDU content mapping from QSIG to H.323 11 ISO/IEC 21991:2002(E) iv ISO/IEC 2002 All rights reserved9.1.1 ccbsRequest/ccnrRequest invoke APDU mapping 11 9.1.2 ccbsRequest/ccnrRequest return result APDU mappi
12、ng 11 9.1.3 ccCancel/ccExecPossible invoke APDU mapping 11 9.2 APDU content mapping from H.323 to QSIG 12 9.2.1 ccbsRequest/ccnrRequest invoke APDU mapping 12 9.2.2 ccbsRequest/ccnrRequest return result APDU mapping 12 9.2.3 ccCancel/ccExecPossible invoke APDU mapping 12 Annexes A - Implementation C
13、onformance Statement (ICS) proforma 13 B - Message flow examples 20 ISO/IEC 21991:2002(E) ISO/IEC 2002 All rights reserved vForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardizat
14、ion. National bodies that 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
15、 interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance
16、 with the rules given in the ISO/IEC Directives, Part 3. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard
17、 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 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. ISO/
18、IEC 21991 was prepared by ECMA (as ECMA-326) and was adopted, under a special “fast-track 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. An
19、nex B is for information only. ISO/IEC 21991:2002(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 (CNs). The series uses tele
20、communication 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 call completion supplementary services between a Private Integrate
21、d Services Network (PISN) and a packet-based private telecommunication 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 Recommenda
22、tion 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 wi
23、dely based consensus. INTERNATIONAL STANDARD ISO/IEC 21991:2002(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 Call completion supplementary se
24、rvices 1 Scope This International Standard specifies signalling interworking between “QSIG” and “H.323” in support of call completion supplementary services within a Corporate telecommunication Network (CN). “QSIG” is a signalling protocol that operates at the Q reference point between Private Integ
25、rated services Network 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
26、 (call control in support of basic services), ISO/IEC 11582 (generic functional protocol for the support of supplementary services) and a number of standards specifying individual supplementary services. ISO/IEC 13870 specifies the QSIG protocol in support of call completion services. “H.323” is a s
27、et 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 endpoints in an IP network, either indir
28、ectly 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 capabilities) and Recommendation H.450
29、.1 (generic functional protocol for the support of supplementary services). Recommendation H.450.9 specifies the H.323 protocol in support of call completion services. NOTE - H.450.9 applies only to the 1998 version of H.323 (also known as H.323 version 2) and to later versions. In both ISO/IEC 1387
30、0 (QSIG) and ITU-Recommendation H.450.9 (H.323), the call completion supplementary services are Completion of Calls to Busy Subscribers (SS-CCBS) and Completion of Calls on No Reply (SS-CCNR). These supplementary services apply after a call establishment attempt has failed because the called user wa
31、s busy or not available, and provide means to re-establish the call when the called user becomes available. 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 te
32、rminate at a user of a PISN. In such a scenario, this International Standard allows the completion of calls when the called user becomes available after having been busy (SS- CCBS), or having not answered the original call (SS-CCNR). Interworking between a PISN employing QSIG and a public IP network
33、 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 functionality (e.g., number translation, security functions, etc.).
34、 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 satisfy the requirements identified in the Implement
35、ation Conformance Statement (ICS) proforma in annex A. 3 Normative 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 thes
36、e publications do not apply. However, parties to agreements based 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 referre
37、d to applies. Members of ISO and IEC maintain registers of currently 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 proced
38、ures and protocol ISO/IEC 11579-1:1994, Information technology Telecommunications and information exchange between systems Private integrated services network Part 1: Reference configuration for PISN Exchanges (PINX) ISO/IEC 21991:2002(E) 2 ISO/IEC 2002 All rights reservedISO/IEC 11582:1995, Informa
39、tion technology Telecommunications and information exchange between systems Private Integrated Services Network Generic functional protocol for the support of supplementary services Inter-exchange signalling procedures and protocol ISO/IEC 13870:2001, Information technology Telecommunications and in
40、formation exchange between systems Private Integrated Services Network Inter-exchange signalling protocol Call completion supplementary services ISO/IEC 21409:2001, Information technology Telecommunications and information exchange between systems Corporate telecommunication networks Signalling inte
41、rworking between QSIG and H.323 Generic functional protocol for the support of supplementary services ITU-T Rec. H.225.0, Call signalling protocols and media stream packetization for packet-based multimedia communication systems ITU-T Rec. H.245, Control protocol for multimedia communication ITU-T R
42、ec. H.323, Packet-based multimedia communications systems ITU-T Rec. H.450.1:1998, Generic functional protocol for the support of supplementary services in H.323 ITU-T Rec. H.450.9:2000, Call Completion Supplementary Services for H.323 4 Definitions For the purposes of this International Standard, t
43、he following definitions apply. 4.1 External definitions This International Standard uses the following terms defined in other documents: Call (ISO/IEC 21409) Corporate telecommunication Network (CN) (ISO/IEC 21409) Endpoint (ITU-T Rec. H.323) Gatekeeper (ITU-T Rec. H.323) Private Integrated Service
44、s Network (PISN) (ISO/IEC 21409) Private Integrated services Network eXchange (PINX) (ISO/IEC 11579-1) Additionally the definitions in ISO/IEC 13870 and ITU-T Recommendation H.450.9 apply as appropriate. 4.2 Other definitions 4.2.1 Entity A Signalling entity at the PINX or H.323 endpoint serving the
45、 calling user (user A). 4.2.2 Entity B Signalling entity at the PINX or H.323 endpoint serving the called user (user B). 4.2.3 Gateway A gateway as defined in H.323 specifically for the purpose of interworking with a network employing QSIG. 4.2.4 IP network A network, unless otherwise stated a CN, o
46、ffering connectionless packet-mode services based on the Internet Protocol (IP) as the network layer protocol. 4.2.5 Leg A Call segment that lies between entity A and entity B. 4.2.6 Scenario A1 Interworking arrangement in which entity A (PINX A) is in the PISN and entity B is in the IP network. 4.2
47、.7 Scenario A2 Interworking arrangement in which entity A (endpoint A) is in the IP network and entity B is in the PISN. ISO/IEC 21991:2002(E) ISO/IEC 2002 All rights reserved 35 Acronyms APDU Application Protocol Data Unit CN Corporate telecommunication Network ICS Implementation Conformance Statem
48、ent IP Internet Protocol PINX Private Integrated services Network eXchange PISN Private Integrated Services Network SS-CC Supplementary Service Call Completion (either SS-CCBS or SS-CCNR) SS-CCBS Supplementary Service Completion of Calls to Busy Subscribers SS-CCNR Supplementary Service Completion o
49、f Calls on No Reply 6 Service architecture 6.1 Service architecture for invocation and operation 6.1.1 ISO/IEC 13870 service architecture The QSIG protocol for call completion invocation and operation is based around two signalling entities or PINX types: entity A the PINX serving the calling user (user A); entity B the PINX serving the called user (user B). Where a user is in another network, the role of entity A or entity B is performed by the ot
