ISO/IEC 15431:2003

INTERNATIONAL ISO/IEC
STANDARD 15431
Second edition
2003-04-01
Information technology —
Telecommunications and information
exchange between systems — Private
Integrated Services Network —
Inter-exchange signalling protocol —
Wireless terminal call handling additional
network features
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseau privé à intégration de
services — Protocole de signalement d'interéchange — Caractéristiques
de réseau additionnelles pour le traitement d'appel de terminal sans fil

Reference number
©
ISO/IEC 2003
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©  ISO/IEC 2003
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ii © ISO/IEC 2003 — All rights reserved

Contents
Foreword vi
Introduction vii
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
4.2.1 Alternative identifier 3
4.2.2 Home data base (HDB) 3
4.2.3 Home PINX 3
4.2.4 Rerouteing PINX 3
4.2.5 Visitor data base (VDB) 3
4.2.6 Visitor PINX 3
4.2.7 WTMI-detect PINX 3
5 Symbols and abbreviated terms 4
Signalling protocol for the support of ANF-WTMI
6 4
6.1 ANF-WTMI description 4
6.2 ANF-WTMI operational requirements 5
6.2.1 Requirements on the Rerouteing PINX 5
6.2.2 Requirements on the WTMI-detect PINX 5
6.2.3 Requirements on the Home PINX 5
6.2.4 Requirements on the Visitor PINX 5
6.2.5 Requirements on a Transit PINX 5
ANF-WTMI coding requirements
6.3 6
6.3.1 Operations 6
6.3.2 Information elements 8
6.3.3 Messages 9
6.4 ANF-WTMI state definitions 9
6.4.1 States at the Rerouteing PINX 9
6.4.2 States at the WTMI-detect PINX 9
6.4.3 States at the Home PINX 9
6.4.4 States at the Visitor PINX 9
6.5 ANF-WTMI signalling procedures for invocation and operation 9
6.5.1 Actions at the Rerouteing PINX 9
6.5.2 Actions at the WTMI-detect PINX 10
6.5.3 Actions at the Home PINX 11
6.5.4 Actions at the Visitor PINX 12
6.5.5 Actions at a Transit PINX 12
6.5.6 Actions at an Originating PINX 12
6.6 ANF-WTMI impact of interworking with public ISDNs 12
ANF-WTMI impact of interworking with non-ISDNs
6.7 13
6.8 Protocol interactions between ANF-WTMI and other supplementary services and ANFs 13
© ISO/IEC 2003 – All rights reserved iii

6.8.1 Interaction with Calling Name Identification Presentation (SS-CNIP) 13
6.8.2 Interaction with Connected Name Identification Presentation (SS-CONP) 13
6.8.3 Interaction with Call Completion to Busy Subscriber (SS-CCBS) 13
6.8.4 Interaction with Call Completion on No Reply (SS-CCNR) 13
6.8.5 Interaction with Call Transfer (SS-CT) 13
6.8.6 Interaction with Call Forwarding Unconditional (SS-CFU) 13
6.8.7 Interaction with Call Forwarding Busy (SS-CFB) 13
6.8.8 Interaction with Call Forwarding No Reply (SS-CFNR) 13
6.8.9 Interaction with Call Deflection (SS-CD) 13
6.8.10 Interaction with Path Replacement (ANF-PR) 13
6.8.11 Interaction with Call Offer (SS-CO) 13
6.8.12 Interaction with Call Intrusion (SS-CI) 14
Interaction with Do Not Disturb (SS-DND)
6.8.13 14
6.8.14 Interaction with Do Not Disturb Override (SS-DNDO) 14
6.8.15 Interaction with Advice Of Charge (SS-AOC) 14
6.8.16 Interaction with Recall (SS-RE) 14
6.8.17 Interaction with Call Interception (ANF-CINT) 14
6.8.18 Interaction with Transit Counter (ANF-TC) 14
6.8.19 Interaction with Route Restriction Class (ANF-RRC) 14
6.8.20 Interaction with Message Waiting Indication (SS-MWI) 15
Interaction with Wireless Terminal Location Registration (SS-WTLR)
6.8.21 15
6.8.22 Interaction with Wireless Terminal Information (ANF-WTINFO) 15
6.8.23 Interaction with Wireless Terminal Outgoing Call (ANF-WTMO) 15
6.8.24 Interaction with Wireless Terminal Authentication of the Terminal (SS-WTAT) 15
6.8.25 Interaction with Wireless Terminal Authentication of the Network (SS-WTAN) 15
6.9 ANF-WTMI parameter values (timers) 16
6.9.1 Timer T1 16
6.9.2 Timer T2 16
7 Signalling protocol for the support of ANF-WTMO 16
7.1 ANF-WTMO description 16
7.2 ANF-WTMO operational requirements 16
7.2.1 Requirements on the Originating PINX 16
7.2.2 Requirements on the Home PINX 16
7.2.3 Requirements on a Transit PINX 16
7.3 ANF-WTMO coding requirements 16
7.3.1 Operations 16
7.3.2 Information elements 16
Messages
7.3.3 16
7.4 ANF-WTMO state definitions 17
7.4.1 States at the Originating PINX 17
7.4.2 States at the Home PINX 17
7.5 ANF-WTMO signalling procedures 17
7.5.1 Actions at the Originating PINX 17
7.5.2 Actions at the Home PINX 17
7.5.3 Actions at the Transit PINX 18
ANF-WTMO impact of interworking with public ISDNs
7.6 18
7.7 ANF-WTMO impact of interworking with non-ISDNs 18
7.8 Protocol interactions between ANF-WTMO and other supplementary services and ANFs 18
7.8.1 Interaction with Calling Name Identification Presentation (SS-CNIP) 18
7.8.2 Interaction with Connected Name Identification Presentation (SS-CONP) 18
iv © ISO/IEC 2003 – All rights reserved

7.8.3 Interaction with Call Completion to Busy Subscriber (SS-CCBS) 18
7.8.4 Interaction with Call Completion on No Reply (SS-CCNR) 18
7.8.5 Interaction with Call Transfer (SS-CT) 18
7.8.6 Interaction with Call Diversion (SS-CFU, SS-CFB, SS-CFNR, SS-CD) 18
7.8.7 Interaction with Path Replacement (ANF-PR) 19
7.8.8 Interaction with Call Offer (SS-CO) 19
7.8.9 Interaction with Call Intrusion (SS-CI) 19
7.8.10 Interaction with Do Not Disturb (SS-DND) 19
7.8.11 Interaction with Do Not Disturb Override (SS-DNDO) 19
7.8.12 Interaction with Advice of Charge (SS-AOC) 19
7.8.13 Interaction with Recall (SS-RE) 19
7.8.14 Interaction with Call Interception (ANF-CINT) 19
Interaction with Transit Counter (ANF-TC)
7.8.15 19
7.8.16 Interaction with Route Restriction Class (ANF-RRC) 19
7.8.17 Interaction with Message Waiting Indication (SS-MWI) 19
7.8.18 Interaction with Wireless Terminal Location Registration (SS-WTLR) 19
7.8.19 Interaction with Wireless Terminal Information (ANF-WTINFO) 19
7.8.20 Interaction with Wireless Terminal Incoming Call (ANF-WTMI) 19
7.8.21 Interaction with Wireless Terminal Authentication of the Terminal (SS-WTAT) 19
7.8.22 Interaction with Wireless Terminal Authentication of the Network (SS-WTAN) 20
Parameter values (timers)
7.9 20
7.9.1 Timers at the Originating PINX 20
7.9.2 Timers at the Home PINX 20
Annexes
A - Protocol Implementation Conformance Statement (PICS) proforma 21
B - Imported ASN.1 definitions 31
C - Examples of Message Sequences 32
D - Specification and Description Language (SDL) representation of procedures 37
E - ASN.1 definitions according to ITU-T Recs. X.208 / X.209 45
© ISO/IEC 2003 – All rights reserved v

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 15431 was prepared by ECMA (as ECMA-304) 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 15431:1999), which has been technically revised.
vi © ISO/IEC 2003 – All rights reserved

Introduction
This International Standard is one of a series of Standards defining Wireless Terminal Mobility (WTM) 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 Wireless Terminal
Call Handling additional network feature. 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 JTC 1, ITU-T, ETSI and other international and national standardization
bodies. It represents a pragmatic and widely based consensus.
© ISO/IEC 2003 – All rights reserved vii

INTERNATIONAL STANDARD ISO/IEC 15431:2003(E)

Information technology — Telecommunications and information
exchange between systems — Private Integrated Services Network —
Inter-exchange signalling protocol — Wireless terminal call handling
additional network features
1Scope
This International Standard specifies the signalling protocol for the support of the Wireless terminal call handling additional
network features (ANF-WTMI and ANF-WTMO) at the Q reference point between Private Integrated services Network
eXchanges (PINX) connected together within a Private Integrated Services Network (PISN).
ANF-WTMI is a feature that directs incoming calls to a WTMI user within the PISN regardless of the WTMI user’s
geographical location within the PISN, provided that the WTMI user’s location is known. Roaming outside the PISN is outside
the scope of this edition of this International Standard.
ANF-WTMO permits the PISN to process call requests from a WTMO user at the home location, if required.
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 ITU-T Rec. I.130. 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 15430.
The signalling protocol for ANF-WTMI and ANF-WTMO 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 ANF-WTMI / ANF-WTMO 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.
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 11571:1998, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Networks - Addressing
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 11574:2000, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Circuit-mode 64 kbit/s bearer services - Service description, functional capabilities and
information flows
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 2003 – All rights reserved 1

ISO/IEC 13241:1997, Information technology - Telecommunications and information exchange between systems - Private
Integr
...