ISO/IEC 23290:2004
(Main)Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network (PISN) — Mapping functions for the tunnelling of QSIG through H.323 networks
Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network (PISN) — Mapping functions for the tunnelling of QSIG through H.323 networks
ISO/IEC 23290:2004 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 Network (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 usually represents a unidirectional media stream conveyed by means of the Real-time Transport Protocol (RTP). The inter-PINX signalling protocol is assumed to be QSIG, as specified in ISO/IEC 11572, ISO/IEC 11582 and other International Standards. ISO/IEC 23290:2004 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 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 ISO/IEC 23290:2004, 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) 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 features are limited to those available in all networks and supported by the gateways. This latter scenario is outside the scope of this document. ISO/IEC 23290:2004 is applicable to PINXs that can be interconnected to form a PISN using QSIG as the inter-PINX signalling protocol.
Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseau privé avec intégration de services (PISN) — Fonctions d'application pour l'emploi de l'action tunnel de QSIG à travers les réseaux H.323
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INTERNATIONAL ISO/IEC
STANDARD 23290
Second edition
2004-10-01
Information technology —
Telecommunications and information
exchange between systems — Private
Integrated Services Network (PISN) —
Mapping functions for the tunnelling of
QSIG through H.323 networks
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseau privé avec intégration de
services (PISN) — Fonctions d'application pour l'emploi de l'action
tunnel de QSIG à travers les réseaux H.323
Reference number
©
ISO/IEC 2004
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© ISO/IEC 2004
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ii © ISO/IEC 2004 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Conformance . 1
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
6.2 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 -channel. 7
Q
9.3 Mapping of the U -channel(s). 7
Q
9.3.1 On-demand scenario . 7
9.3.2 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 Transfer 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
© ISO/IEC 2004 – All rights reserved iii
Foreword
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 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-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 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 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, under 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 edition (ISO/IEC 23290:2002), which has been technically
revised.
iv © ISO/IEC 2004 – All rights reserved
Introduction
This International Standard is one of a series of standards defining mapping functions 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.
This particular Standard 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 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 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
optional semi-permanent scenario in more detail.
© ISO/IEC 2004 – All rights reserved v
INTERNATIONAL STANDARD ISO/IEC 23290:2004(E)
Information 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 packet 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 tunnelling 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 assumed 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
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 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) 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 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 protocol.
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 document. 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 network — 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 2004 – All rights reserved 1
ISO/IEC 11582:2002, Information technology — Telecommunications and information exchange between
systems — Private Integrated Services Network — Generic functional
...
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