1、 ETSI TS 102 037 V1.2.1 (2004-03)Technical Specification Private Integrated Services Network (PISN);Mapping functions for the tunnelling ofQSIG through H.323 networksETSI ETSI TS 102 037 V1.2.1 (2004-03) 2 Reference RTS/ECMA-00287 Keywords H.323, PINX, QSIG ETSI 650 Route des Lucioles F-06921 Sophia
2、 Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The
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5、b/status/status.asp If you find errors in the present document, send your comment to: editoretsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunicatio
6、ns Standards Institute 2004. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered
7、 for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 102 037 V1.2.1 (2004-03) 3 Contents Intellectual Property Rights5 Foreword.5 Brief history5 1 Scope 6 2 Conformance 6 3 References 6 4 Definitions7 4.1 External definitions 7 4.2 Other definitions.7 4.2.1 Call7 4.2
8、.1.1 H.323 call7 4.2.1.2 PISN call .7 4.2.1.3 Call segment7 4.2.2 Channel.7 4.2.2.1 DQ-Channel 7 4.2.2.2 UQ-Channel 8 4.2.3 Inter-PINX Connection (IPC).8 4.2.4 Inter-PINX Link (IPL)8 4.2.5 PINX roles 8 4.2.5.1 Initiating PINX8 4.2.5.2 Accepting PINX8 5 List of acronyms.8 6 Introduction 8 6.1 Referen
9、ce configuration .8 6.2 Specific scenarios.9 6.3 Relationship with H.323 gateways .10 7 Capabilities at the Q reference point 10 8 Capabilities at the C reference point 11 9 Mapping functions11 9.1 General requirements .11 9.2 Mapping of the DQ-channel11 9.3 Mapping of the UQ-channel(s)12 9.3.1 On-d
10、emand scenario .12 9.3.2 Semi-permanent scenario12 10 IPC control procedures.12 10.1 Protocol identification 12 10.2 Registration with gatekeeper 12 10.3 Systems without gatekeeper .13 10.4 H.323 call establishment 13 10.4.1 Call admission 13 10.4.2 Outgoing call establishment13 10.4.3 Incoming call
11、 establishment .14 10.5 Transfer of inter-PINX signalling information.14 10.6 H.323 call clearing .14 11 Scenario specific procedures15 11.1 On-demand scenario.15 11.2 Semi-permanent scenario .15 Annex A (normative): Implementation Conformance Statement (ICS) Proforma18 ETSI ETSI TS 102 037 V1.2.1 (
12、2004-03) 4 A.1 Introduction 18 A.1.1 Purpose of an ICS proforma.18 A.2 Instructions for completing the ICS proforma18 A.2.1 General structure of the ICS proforma .18 A.2.2 Additional information.19 A.2.3 Exception information19 A.2.4 Further indications of the ICS proforma tables 20 A.3 Identificati
13、on of the implementation 20 A.3.1 Implementation Identification 20 A.3.2 Specification for which this ICS applies 20 A.4 General requirements .21 A.5 Procedures 21 A.6 Coding 22 Annex B (informative): Examples of message sequences23 B.1 Successful call setup.23 B.1.1 Enbloc sending .23 B.1.2 Overlap
14、 sending24 B.2 Normal call clearing.25 History 26 ETSI ETSI TS 102 037 V1.2.1 (2004-03) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for
15、 ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:
16、/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may
17、become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ECMA on behalf of its members and those of the European Telecommunications Standards Institute (ETSI). Brief history The present document is one of a series of ECMA standards defining mapping f
18、unctions in exchanges of Private Integrated Services Networks required for the utilization 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. The
19、present document specifies mapping functions for the type of scenarios where two or more PINXs are interconnected via on-demand connections using an H.323 packet network as the IVN. The present document is based upon the practical experience of ECMA member companies and the results of their active a
20、nd continuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and 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 option
21、al semi-permanent scenario in more detail. ETSI ETSI TS 102 037 V1.2.1 (2004-03) 6 1 Scope The present document specifies functions for using an H.323 packet network in order to interconnect two Private Integrated services Network eXchanges (PINXs) forming part of a Private Integrated Services Netwo
22、rk (PISN). Interconnection is achieved by carrying the inter-PINX signalling protocol over the H.323 call signalling channel, making use of the protocol tunnelling facilities of H.323, and inter-PINX user information (e.g. voice) over logical channels established through H.323. Each logical channel
23、usually represents a unidirectional media stream conveyed by means of the Real-time Tranport Protocol (RTP). The inter-PINX signalling protocol is assumed to be QSIG, as specified in ECMA-143 2, ECMA-165 3 and other standards. The present document provides for an on-demand type of interconnection, w
24、here 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 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
25、in the present document, the PINXs participating in a call are not necessarily aware of the H.323 network providing the interconnection, 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.323-QSIG) i
26、s 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 features are limited to those available in all networks and supported by the gateways. This latter scenario is outside the scope of the present document. The present
27、document is applicable to PINXs that can be interconnected to form a PISN using QSIG as the inter-PINX signalling protocol. 2 Conformance In order to conform to the present document, a PINX shall satisfy the requirements identified in the Implementation Conformance Statement (ICS) proforma in annex
28、A. 3 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subse
29、quent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 ECMA-133: “Private Integrated Services Network (PISN) - Reference Co
30、nfiguration for PISN Exchanges (PINX)“. 2 ECMA-143: “Private Integrated Services Network (PISN) - Circuit Mode Bearer Services - Inter-Exchange Signalling Procedures and Protocol (QSIG-BC)“. 3 ECMA-165: “ Private Integrated Services Network (PISN) - Generic Functional Protocol for the Support of Sup
31、plementary Services - Inter-Exchange Signalling Procedures and Protocol (QSIG-GF)“. 4 ITU-T Recommendation H.225.0: “Call signalling protocols and media stream packetization for packet-based multimedia communication systems“. 5 ITU-T Recommendation H.245: “Control protocol for multimedia communicati
32、on“. ETSI ETSI TS 102 037 V1.2.1 (2004-03) 7 6 ITU-T Recommendation H.323: “Packet-based multimedia communications systems“. 7 ITU-T Recommendation H.323 annex M.1: “Tunnelling of signalling protocols (QSIG) in H.323“. 4 Definitions 4.1 External definitions For the purposes of the present document,
33、the following definitions apply: - Call independent signalling connection (ECMA-165 3); - C reference point (ECMA-133 1); - Gatekeeper (ITU-T Recommendation H.323 6); - Gateway, Trunking Gateway (ITU-T Recommendation H.323 6); - Intervening network (ECMA-133 1); - Logical channel (ITU-T Recommendati
34、on H.323 6); - Preceding PINX (ECMA-165 3); - Private Integrated Services Network (ECMA-133 1); - Private Integrated services Network eXchange (ECMA-133 1); - Q reference point (ECMA-133 1); - Subsequent PINX (ECMA-165 3). 4.2 Other definitions 4.2.1 Call 4.2.1.1 H.323 call A call as defined in ITU-
35、T Recommendation H.323 6, i.e. a point-to-point communication between two H.323 endpoints. Here specifically a call in the H.323 network between two gateways. 4.2.1.2 PISN call A call as defined in ECMA-143 2 and ECMA-165 3. 4.2.1.3 Call segment A portion of a (PISN) call between two entities taking
36、 part in that call. The smallest segment 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 DQ-Channel A channel used to convey call control information be
37、tween the Q reference points of two peer PINXs. ETSI ETSI TS 102 037 V1.2.1 (2004-03) 8 4.2.2.2 UQ-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
38、 to transport inter-PINX information from the PISN control plane and/or 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 Th
39、e PINX that initiates an IPL establishment request. 4.2.5.2 Accepting PINX The PINX that accepts an IPL establishment request. 5 List of acronyms For the purposes of the present document, the following abbreviations apply: GK Gatekeeper ICS Implementation Conformance Statement IP Internet ProtocolIP
40、C Inter-PINX Connection IPL Inter-PINX Link IVN InterVening Network PINX Private Integrated services Network eXchange PISN Private Integrated Services Network QSIG SIGnalling system for the Q reference point RAS Registration, Admission and Status RRQ Register ReQuest message RTP/RTCP Real-time Tranp
41、ort Protocol / Real Time Control Protocol TCP Transmission Control ProtocolUDP User Datagram Protocol 6 Introduction 6.1 Reference configuration ECMA-133 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
42、 reference point with a peer PINX. This communication is known as an Inter-PINX Link (IPL) and comprises a signalling channel, known as a DQ-channel, and one or more user information channels, each known as a UQ-channel; see figure 1. One or more IPLs can be established between the same pair of PINX
43、s. ETSI ETSI TS 102 037 V1.2.1 (2004-03) 9 Switchingand CallControlfunctionsDQ-channelBQ-channelBQ-channelQ referencepointSwitchingand CallControlfunctionsInter-PINX linkPINX PINXQ referencepointFigure 1: IPL concept There are many ways of implementing an IPL. In general, the IPL uses services of an
44、other network, known as an InterVening Network (IVN). A PINX interfaces to the IVN at the C reference point. The IVN provides connections, known as Inter-PINX Connections (IPCs) between the C reference points of the peer PINXs. Mapping functions within each PINX map the DQ-channel and the UQ-channel
45、s at the Q reference point onto one or more IPCs at the C reference point. 6.2 Specific scenarios The present document specifies 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 infor
46、mation; and a pair of UDP streams, one stream in each direction, for carrying user information over RTP. NOTE: Other means of transporting 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 ITU-T Recommendat
47、ion H.323 6 for more details. These cases are outside the scope of the present document. A single IPL requires a single signalling connection, for support of the DQ-channel, and one pair of UDP streams per UQ-channel. The main inter-PINX connection scenario described in the present document is an on
48、-demand connection scenario. This means that an IPL is established whenever a PISN call segment is to be set up between two PINXs and released when the PISN call ends. An optional semi-permanent scenario is also described, where multiple concurrent or consecutive PISN calls can use the same IPL. In
49、both scenarios the signalling connection is established by means of an H.323 call, using the protocol tunnelling facilities provided by ITU-T Recommendations H.225.0 4 and H.323 annex M.1 7. The H.225.0 call signalling connection in conjunction with the tunnelling of the QSIG signalling is used to provide the DQ-channel. The pair of UDP streams used to provide an inter-PINX user connection (UQ-channel) is established as H.323 logical channel(s). An IPL may have multiple UQ-channels. Figure 2 illustrates these conce
