ISO/IEC 17343:2007
(Main)Information technology — Telecommunications and information exchange between systems — Corporate telecommunication networks — Signalling interworking between QSIG and SIP — Basic services
Information technology — Telecommunications and information exchange between systems — Corporate telecommunication networks — Signalling interworking between QSIG and SIP — Basic services
ISO/IEC 17343:2007 specifies signalling interworking between QSIG and the Session Initiation Protocol (SIP) in support of basic services within a corporate telecommunication network (CN) (also known as enterprise network). QSIG is a signalling protocol that operates between Private Integrated services Network eXchanges (PINX) within a Private Integrated Services Network (PISN). A PISN provides circuit-switched basic services and supplementary services to its users. QSIG is specified in other Standards. NOTE The name QSIG was derived from the fact that it is used for signalling at the Q reference point. The Q reference point is a point of demarcation between two PINXs. SIP is an application-layer protocol for establishing, terminating, and modifying multimedia sessions. It is typically carried over IP. Telephone calls are considered a type of multimedia session where just audio is exchanged. As the support of telephony within corporate networks evolves from circuit-switched technology to Internet technology, the two technologies will coexist in many networks for a period, perhaps several years. Therefore, there is a need to be able to establish, modify, and terminate sessions involving a participant in the SIP network and a participant in the QSIG network. Such calls are supported by gateways that perform interworking between SIP and QSIG. ISO/IEC 17343:2007 specifies SIP-QSIG signalling interworking for basic services that provide a bi-directional transfer capability for speech, DTMF, facsimile, and modem media between a PISN employing QSIG and a corporate IP network employing SIP. Other aspects of interworking, e.g., the use of RTP and SDP, will differ according to the type of media concerned and are outside the scope of ISO/IEC 17343:2007. Call-related and call-independent signalling in support of supplementary services is outside the scope of ISO/IEC 17343:2007, but support for certain supplementary services (e.g., call transfer, call diversion) could be the subject of future work. Interworking between QSIG and SIP permits a call originating at a user of a PISN to terminate at a user of a corporate IP network, or a call originating at a user of a corporate IP network to terminate at a user of a PISN. Interworking between a PISN employing QSIG and a public IP network employing SIP is outside the scope of ISO/IEC 17343:2007. However, the functionality specified in ISO/IEC 17343:2007 is in principle applicable to such a scenario when deployed in conjunction with other relevant functionality (e.g., number translation, security functions, etc.). ISO/IEC 17343:2007 is applicable to any interworking unit that can act as a gateway between a PISN employing QSIG and a corporate IP network employing SIP.
Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseaux de télécommunications d'entreprise — Signalisation d'interfonctionnement entre QSIG et SIP — Services de base
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INTERNATIONAL ISO/IEC
STANDARD 17343
Second edition
2007-11-15
Information technology —
Telecommunications and information
exchange between systems — Corporate
telecommunication networks —
Signalling interworking between QSIG
and SIP — Basic services
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseaux de télécommunications
d'entreprise — Signalisation d'interfonctionnement entre QSIG et SIP —
Services de base
Reference number
©
ISO/IEC 2007
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ii © ISO/IEC 2007 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Conformance.2
3 Normative references .2
4 Terms and definitions .3
5 Abbreviated terms .3
6 Background and Architecture .4
7 General Requirements .6
8 Message Mapping Requirements.7
8.1 Message Validation and Handling of Protocol Errors.7
8.2 Call Establishment from QSIG to SIP .8
8.3 Call Establishment from SIP to QSIG .12
8.4 Call Clearing and Call Failure .16
8.5 Request to Change Media Characteristics.19
9 Number Mapping.19
9.1 Mapping from QSIG to SIP.20
9.2 Mapping from SIP to QSIG.21
10 Requirements for Support of Basic Services .23
10.1 Derivation of QSIG Bearer Capability Information Element .23
10.2 Derivation of Media Type in SDP.23
11 Security Considerations .24
11.1 General.24
11.2 Calls from QSIG to Invalid or Restricted Numbers .24
11.3 Abuse of SIP Response Code .24
11.4 Use of the To Header URI.24
11.5 Use of the From Header URI .25
11.6 Abuse of Early Media .25
11.7 Protection from Denial-of-Service Attacks .25
Annex A (normative) Implementation Conformance Statement (ICS) proforma .26
Annex B (informative) Example Message Sequences.34
© ISO/IEC 2007 – 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 17343 was prepared by Ecma International (as ECMA-339) 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.
This second edition cancels and replaces the first edition (ISO/IEC 17343:2004), which has been technically
revised.
iv © ISO/IEC 2007 – All rights reserved
Introduction
This International Standard is one of a series of Standards defining the interworking of services and signalling
protocols deployed in corporate telecommunication networks (CNs) (also known as enterprise networks). The
series uses telecommunication 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 basic services between a Private
Integrated Services Network (PISN) and a packet-based private telecommunications network based on the
Internet Protocol (IP). It is further assumed that the protocol for the PISN part is QSIG and that the protocol for
the IP-based network is SIP. Compared with the first edition of ISO 17343, this second edition includes
numerous small changes arising during derived work in the IETF on RFC 4497. This second edition is in full
technical alignment with RFC 4497.
This International 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 JTC 1, ITU-T, ETSI and other international and
national standardization bodies. It represents a pragmatic and widely based consensus.
In this International Standard, the key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as
described in RFC 2119 [4] and indicate requirement levels for compliant SIP implementations.
© ISO/IEC 2007 – All rights reserved v
INTERNATIONAL STANDARD ISO/IEC 17343:2007(E)
Information technology — Telecommunications and information
exchange between systems — Corporate telecommunication
networks — Signalling interworking between QSIG and SIP —
Basic services
1 Scope
This International Standard specifies signalling interworking between QSIG and the Session Initiation Protocol
(SIP) in support of basic services within a corporate telecommunication network (CN) (also known as
enterprise network).
QSIG is a signalling protocol that operates between Private Integrated services Network eXchanges (PINX)
within a Private Integrated Services Network (PISN). A PISN provides circuit-switched basic services and
supplementary services to its users. QSIG is specified in other Standards; in particular [2] (call control in
support of basic services), [3] (generic functional protocol for the support of supplementary services), and a
number of standards specifying individual supplementary services.
NOTE The name QSIG was derived from the fact that it is used for signalling at the Q reference point. The Q
reference point is a point of demarcation between two PINXs.
SIP is an application-layer protocol for establishing, terminating, and modifying multimedia sessions. It is
typically carried over IP [15], [16]. Telephone calls are considered a type of multimedia session where just
audio is exchanged. SIP is defined in [10].
As the support of telephony within corporate networks evolves from circuit-switched technology to Internet
technology, the two technologies will coexist in many networks for a period, perhaps several years. Therefore,
there is a need to be able to establish, modify, and terminate sessions involving a participant in the SIP
network and a participant in the QSIG network. Such calls are supported by gateways that perform
interworking between SIP and QSIG.
This International Standard specifies SIP-QSIG signalling interworking for basic services that provide a bi-
directional transfer capability for speech, DTMF, facsimile, and modem media between a PISN employing
QSIG and a corporate IP network employing SIP. Other aspects of interworking, e.g., the use of RTP and
SDP, will differ according to the type of media concerned and are outside the scope of this International
Standard.
Call-related and call-independent signalling in support of supplementary services is outside the scope of this
International Standard, but support for certain supplementary services (e.g., call transfer, call diversion) could
be the subject of future work.
Interworking between QSIG and SIP permits a call originating at a user of a PISN to terminate at a user of a
corporate IP network, or a call originating at a user of a corporate IP network to terminate at a user of a PISN.
Interworking between a PISN employing QSIG and a public IP network employing SIP 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.).
This International Standard is applicable to any interworking unit that can act as a gateway between a PISN
employing QSIG and a corporate IP network employing SIP.
© ISO/IEC 2007 – All rights reserved 1
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 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.
[1] ISO/IEC 11571:1998, Information technology — Telecommunications and information exchange between
systems — Private Integrated Services Networks — Addressing
[2] 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
[3] ISO/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
[4] RFC 211
...
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