ISO/IEC 20114:2004

INTERNATIONAL ISO/IEC
STANDARD 20114
First edition
2004-05-15
Information technology —
Telecommunications and information
exchange between systems — Private
Integrated Services Network (PISN) —
Inter-exchange signalling protocol —
Make call request supplementary service
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseau privé à intégration de
services — Protocole de signalisation d'échange — Service
supplémentaire de demande par appel

Reference number
©
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. 3
5 Acronyms. 4
6 Signalling Protocol for the support of SS-MCR.4
6.1 SS-MCR description. 4
6.2 SS-MCR operational requirements. 4
6.3 SS-MCR coding requirements . 6
6.4 SS-MCR state definitions . 9
6.5 SS-MCR signalling procedures . 10
6.6 SS-MCR impact of interworking with public ISDNs. 13
6.7 SS-MCR impact of interworking with non-ISDNs . 13
6.8 Protocol interactions between SS-MCR and other supplementary services and ANFs. 13
6.9 SS-MCR parameter values (Timers) . 16
Annex A (normative) Protocol Implementation Conformance Statement (PICS) Proforma . 17
A.1 Introduction. 17
A.2 Instructions for completing the PICS proforma.17
A.3 PICS proforma for ISO/IEC 20114. 18
Annex B (informative) Examples of Message Sequences. 21
B.1 Example message sequences for invocation and operation of SS-MCR. 22
Annex C (informative) Specification and Description Language (SDL) Representation of
Procedures . 26
C.1 SDL representation of SS-MCR at the Requesting PINX . 27
C.2 SDL representation of SS-MCR at the Co-operating PINX. 28
C.3 SDL representation of SS-MCR at the Destination PINX . 29

© 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 20114 was prepared by ECMA (as ECMA-344) 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.

iv © ISO/IEC 2004 – All rights reserved

Introduction
This International Standard is one of a series defining services and signalling protocols applicable to Private
Integrated Services Networks (PISNs). The series uses ISDN concepts as developed by ITU-T and conforms
to the framework of International Standards for Open Systems Interconnection as defined by ISO/IEC.
This International Standard specifies the signalling protocol for use at the Q reference point in support of the
Make Call Request supplementary service. The protocol defined in this International Standard forms part of
the PSS1 protocol (informally known as QSIG).
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 JTC1, ITU-T, ETSI and other
international and national standardization bodies. It represents a pragmatic and widely based consensus.

© ISO/IEC 2004 – All rights reserved v

INTERNATIONAL STANDARD ISO/IEC 20114:2004(E)

Information technology — Telecommunications and information
exchange between systems — Private Integrated Services
Network (PISN) — Inter-exchange signalling protocol — Make
call request supplementary service
1 Scope
This International Standard specifies the signalling protocol for the support of the Make Call Request
supplementary service (SS-MCR) at the Q reference point between Private Integrated services Network
eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN).
Supplementary service MCR enables a Requesting User to request a Co-operating User to establish a new
Requested Call to a Destination User. This new Requested Call between the Co-operating and Destination
User can be either a Basic call or a Call Independent Signalling Connection.
The Q reference point is defined in ISO/IEC 11579-1.
Service specifications are produced in three stages and according to the method specified in ETS 300 387.
This International Standard contains the stage 3 specification for the Q reference point and satisfies the
requirements identified by the stage 1 and stage 2 specifications in ISO/IEC 20113.
The signalling protocol for SS-MCR operates on top of the signalling protocol for basic circuit switched call
control, as specified in ISO/IEC 11572, and uses certain aspects of the generic procedures for the control of
supplementary services specified in ISO/IEC 11582.
This International Standard also specifies additional signalling protocol requirements for the support of
interactions at the Q reference point between SS-MCR and other supplementary services and ANFs.
This International Standard is applicable to PINXs, which can interconnect to form a PISN.
2 Conformance
In order to conform to this International Standard, a PINX shall satisfy the requirements identified in the
Protocol Implementation Conformance Statement (PICS) proforma in Annex A.
Conformance to this International Standard includes conforming to those clauses that specify protocol
interactions between SS-MCR and other supplementary services and ANFs for which signalling protocols at
the Q reference point are supported in accordance with the stage 3 standards concerned.
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 2004 – All rights reserved 1

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 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 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
ISO/IEC 20113:2004, Information technology — Telecommunications and information exchange between
systems — Private Integrated Services Network — Specification, functional model and information flows —
Make call request supplementary service
ISO/IEC 20115:2004, Information technology — Telecommunications and information exchange between
systems — Private Integrated Services Network — Use of QSIG for Message Centre Access (MCA) profile
standard
ETS 300 387:1994, Private Telecommunication Network (PTN); Method for the specification of basic and
supplementary services
ITU-T Rec. I.112:1993, Vocabulary of terms for ISDNs
ITU-T Rec. I.210:1993, Principles of telecommunication services supported by an ISDN and the means to
describe them
ITU-T Rec. Q.950:2000, Digital Subscriber Signalling System No. 1 (DSS 1) — Supplementary services
protocols, structure and general principles
ITU-T Rec. Z.100:1999, Specification and Description Language
4 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1 External definitions
This International Standard uses the following terms defined in other documents:
 Application Protocol Data Unit (APDU) (ISO/IEC 11582)
 Call, Basic call (ISO/IEC 11582)
 Call Independent Signalling Connection (ISO/IEC 11582)
 Call-Independent (ISO/IEC 11582)
 Gateway PINX (ISO/IEC 11582)
 Originating PINX (ISO/IEC 11582)
 Private Integrated Services Network (PISN) (ISO/IEC 11579-1)
 Private Integrated services Network eXchange (PINX) (ISO/IEC 11579-1)
 Signalling (ITU-T Rec. I.112)
2 © ISO/IEC 2004 – All rights reserved

 Supplementary Service (ITU-T Rec. I.210)
 Supplementary Service Control Entity (ISO/IEC 11582)
 Terminating PINX (ISO/IEC 11582)
 Transit PINX (ISO/IEC 11582)
4.2 Other definitions
4.2.1
Co-operating PINX
The PINX where the Co-operating User is located.
4.2.2
Co-operating User
The user who receives a Make Call Request and who shall set up a new Requested Call to the Destination
User.
4.2.3
Destination PINX
The PINX where the Destination User is located.
4.2.4
Destination User
The called user of the Requested Call i.e. the user to whom the Co-operating User shall establish a
Requested Call.
4.2.5
Make Call
...