1、 Reference number ISO/IEC 23290:2004(E) ISO/IEC 2004INTERNATIONAL STANDARD ISO/IEC 23290 Second edition 2004-10-01Information technology Telecommunications and information exchange between systems Private Integrated Services Network (PISN) Mapping functions for the tunnelling of QSIG through H.323 n
2、etworks Technologies de linformation Tlcommunications et change dinformation entre systmes Rseau priv avec intgration de services (PISN) Fonctions dapplication pour lemploi de laction tunnel de QSIG travers les rseaux H.323 ISO/IEC 23290:2004(E) PDF disclaimer This PDF file may contain embedded type
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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 2004 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.org Web www.iso.org Published in Switzerland ii ISO/IEC 2004 All rights reservedISO/IEC 23290:2004(E) ISO/IEC 2004 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Conformance . 1
8、3 Normative references . 1 4 Terms and definitions. 2 4.1 External definitions. 2 4.2 Other definitions . 2 4.2.1 Call 2 4.2.2 Channel 3 4.2.3 Inter-PINX Connection (IPC). 3 4.2.4 Inter-PINX Link (IPL) . 3 4.2.5 PINX roles 3 5 List of acronyms . 3 6 Introduction . 4 6.1 Reference configuration. 4 6.
9、2 Specific scenarios. 4 6.3 Relationship with H.323 gateways 5 7 Capabilities at the Q reference point 6 8 Capabilities at the C reference point. 6 9 Mapping functions 7 9.1 General requirements . 7 9.2 Mapping of the D Q -channel 7 9.3 Mapping of the U Q -channel(s) 7 9.3.1 On-demand scenario 7 9.3
10、.2 Semi-permanent scenario 7 10 IPC control procedures 8 10.1 Protocol identification 8 10.2 Registration with gatekeeper. 8 10.3 Systems without gatekeeper . 8 10.4 H.323 call establishment 8 10.4.1 Call admission. 8 10.4.2 Outgoing call establishment 9 10.4.3 Incoming call establishment 9 10.5 Tra
11、nsfer of inter-PINX signalling information 10 10.6 H.323 call clearing. 10 11 Scenario specific procedures 10 11.1 On-demand scenario 10 11.2 Semi-permanent scenario 11 Annex A (normative) Implementation Conformance Statement (ICS) Proforma . 13 Annex B (informative) Examples of message sequences 20
12、 ISO/IEC 23290:2004(E) iv ISO/IEC 2004 All rights reservedForeword ISO (the International Organization 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
13、 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 international organizations, governmental and non
14、-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 with the rules given in the ISO/IEC Directives, Part 2. The main
15、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 requires approval by at least 75 % of the national bodies casting
16、 a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 23290 was prepared by Ecma International (as ECMA-333) and was adopted, unde
17、r a special “fast- track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange between systems, in parallel with its approval by national bodies of ISO and IEC. This second edition cancels and replaces the first
18、 edition (ISO/IEC 23290:2002), which has been technically revised. ISO/IEC 23290:2004(E) ISO/IEC 2004 All rights reserved vIntroduction This International Standard is one of a series of standards defining mapping functions in exchanges of Private Integrated Services Networks required for the utiliza
19、tion of intervening network scenarios. The series uses the ISDN concepts as developed by ITU-T (formerly CCITT) and is also within the framework of standards for open systems interconnection as defined by ISO. This particular Standard specifies mapping functions for the type of scenarios where two o
20、r more PINXs are interconnected via on-demand connections using an H.323 packet network as the IVN. The Standard is based upon the practical experience of member companies and the results of their active and continuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international an
21、d national standardization bodies. It represents a pragmatic and widely based consensus. The second edition is fully compatible with the first edition. It specifies one part of the procedures of the optional semi-permanent scenario in more detail. INTERNATIONAL STANDARD ISO/IEC 23290:2004(E) ISO/IEC
22、 2004 All rights reserved 1Information technology Telecommunications and information exchange between systems Private Integrated Services Network (PISN) Mapping functions for the tunnelling of QSIG through H.323 networks 1 Scope This International Standard specifies functions for using an H.323 pack
23、et network in order to interconnect two Private Integrated services Network eXchanges (PINXs) forming part of a Private Integrated Services Network (PISN). Interconnection is achieved by carrying the inter-PINX signalling protocol over the H.323 call signalling channel, making use of the protocol tu
24、nnelling facilities of H.323, and inter-PINX user information (e.g., voice) over logical channels established through H.323. Each logical channel usually represents a unidirectional media stream conveyed by means of the Real-time Transport Protocol (RTP). The inter-PINX signalling protocol is assume
25、d to be QSIG, as specified in ISO/IEC 11572, ISO/IEC 11582 and other standards. This International Standard provides for an on-demand type of interconnection, where a separate H.323 call is established at the start of each PISN call and cleared down at the end of that call. A semi-permanent scenario
26、 where a single H.323 call with an indefinite lifetime carries QSIG on behalf of many PISN calls is described as an additional option. In the scenarios covered in this International Standard, the PINXs participating in a call are not necessarily aware of the H.323 network providing the interconnecti
27、on, and the features available are those of the QSIG network. This is different from a scenario where true interworking between QSIG and H.323 (i.e. QSIG H.323QSIG) is used to connect two PISNs or two parts of the same PISN. In this latter case all networks participate in a call on equal terms, and
28、features are limited to those available in all networks and supported by the gateways. This latter scenario is outside the scope of this International Standard. This International Standard is applicable to PINXs that can be interconnected to form a PISN using QSIG as the inter-PINX signalling protoc
29、ol. 2 Conformance In order to conform to this International Standard, a PINX shall 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 docume
30、nt. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 11579-1:1994, Information technology Telecommunications and information exchange between systems Private integrated services net
31、work Part 1: Reference configuration for PISN Exchanges (PINX) 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 23290:2004(
32、E) 2 ISO/IEC 2004 All rights reservedISO/IEC 11582:2002, Information 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 ITU-
33、T Rec. H.225.0, Call signalling protocols and media stream packetization for packet based multimedia communications systems (2000 or later) ITU-T Rec. H.245, Control protocol for multimedia communication (2000 or later) ITU-T Rec. H.323, Packet based multimedia communications systems (2000 or later)
34、 ITU-T H.323 Annex M.1, Tunnelling of signalling protocols (QSIG) in H.323 4 Terms and definitions For the purposes of this document, the following terms and definitions apply. 4.1 External definitions For the purpose of this International Standard the following definitions apply: Call independent s
35、ignalling connection (ISO/IEC 11582) C reference point (ISO/IEC 11579-1) Gatekeeper (ITU-T Rec. H.323) Gateway, Trunking Gateway (ITU-T Rec. H.323) Intervening network (ISO/IEC 11579-1) Logical channel (ITU-T Rec. H.323) Preceding PINX (ISO/IEC 11582) Private Integrated Services Network (ISO/IEC 115
36、79-1) Private Integrated services Network eXchange (ISO/IEC 11579-1) Q reference point (ISO/IEC 11579-1) Subsequent PINX (ISO/IEC 11582) 4.2 Other definitions 4.2.1 Call 4.2.1.1 H.323 call A call as defined in ITU-T Rec. H.323, i.e. a point-to-point communication between two H.323 endpoints. Here sp
37、ecifically a call in the H.323 network between two gateways. 4.2.1.2 PISN call A call as defined in ISO/IEC 11572 and ISO/IEC 11582. ISO/IEC 23290:2004(E) ISO/IEC 2004 All rights reserved 34.2.1.3 Call segment A portion of a (PISN) call between two entities taking part in that call. The smallest seg
38、ment is between adjacent entities, e.g. between two PINXs across one Inter-PINX link. 4.2.2 Channel A means of bi-directional transmission of user or signalling information between two points. 4.2.2.1 D Q -Channel A channel used to convey call control information between the Q reference points of tw
39、o peer PINXs. 4.2.2.2 U Q -Channel A channel used to convey user information between the Q reference points of two peer PINXs. 4.2.3 Inter-PINX Connection (IPC) A connection provided by an IVN between two C reference points used to transport inter-PINX information from the PISN control plane and/or
40、the PISN user plane. 4.2.4 Inter-PINX Link (IPL) A link between the Q reference points of two PINXs, comprising the totality of signalling transfer and user information transfer means. 4.2.5 PINX roles 4.2.5.1 Initiating PINX The PINX that initiates an IPL establishment request. 4.2.5.2 Accepting PI
41、NX The PINX that accepts an IPL establishment request. 5 List of acronyms GK Gatekeeper ICS Implementation Conformance Statement IP Internet Protocol IPC Inter-PINX Connection IPL Inter-PINX Link IVN Intervening Network PINX Private Integrated services Network eXchange PISN Private Integrated Servic
42、es Network ISO/IEC 23290:2004(E) 4 ISO/IEC 2004 All rights reservedQSIG Signalling system for the Q reference point RAS Registration, Admission and Status RTP / RTCP Real Time Protocol / Real Time Control Protocol TCP Transmission Control Protocol UDP User Datagram Protocol 6 Introduction 6.1 Refere
43、nce configuration ISO/IEC 11579-1 defines a reference configuration for a PINX. Logically the switching and call control functions of a PINX communicate over an instance of the Q reference point with a peer PINX. This communication is known as an Inter-PINX Link (IPL) and comprises a signalling chan
44、nel, known as a D Q - channel, and one or more user information channels, each known as a U Q -channel; see Figure 1. One or more IPLs can be established between the same pair of PINXs. Switching and Call Control functions D Q-channel B Q-channel B Q-channel Q reference point Switching and Call Cont
45、rol functions Inter-PINX link PINX PINX Q reference pointFigure 1 IPL concept There are many ways of implementing an IPL. In general, the IPL uses services of another network, known as an Intervening Network (IVN). A PINX interfaces to the IVN at the C reference point. The IVN provides connections,
46、known as Inter-PINX Connections (IPCs) between the C reference points of the peer PINXs. Mapping functions within each PINX map the D Q -channel and the U Q -channels at the Q reference point onto one or more IPCs at the C reference point. 6.2 Specific scenarios This International Standard specifies
47、 mapping functions for use when the IVN is an H.323 packet network that is used to provide the following types of IPC: a signalling connection for carrying signalling information; and a pair of UDP streams, one stream in each direction, for carrying user information over RTP. NOTE Other means of tra
48、nsporting user information can be used, e.g. T.38 fax without RTP, an ATM virtual channel, or a bi-directional TCP connection instead of UDP streams. See H.323 for more details. These cases are outside the scope of this International Standard. A single IPL requires a single signalling connection, fo
49、r support of the D Q -channel, and one pair of UDP streams per U Q -channel. The main inter-PINX connection scenario described in this International Standard is an on-demand connection scenario. This means that an IPL is established whenever a PISN call segment is to be set up between two ISO/IEC 23290:2004(E) ISO/IEC 2004 All rights reserved 5PINXs and released when the PISN call ends. An optional semi-permanent scenario is also described, where multiple concurrent
