ISO/IEC 21889:2001

Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Identification and Call Linkage Additional Network Feature

This International Standard specifies the signalling protocol for the support of the Call Identification and Call Linkage Additional Network Feature (ANF-CIDL) at the Q reference point between Private Integrated Network Services Exchanges (PINXs) connected together within a Private Integrated Services Network (PISN). ANF-CIDL is an additional network feature which allows the assignment of a Global Call Identification (GID) to identify a call end-to-end over the call route (i.e. between the two end PINXs). As an option, a Thread Identification (TID) may be assigned to different calls which are logically linked together due to the operation of other supplementary services and/or ANFs. Additionally a Leg Identification (LID) may be assigned, to identify the different legs of a call. NOTE 1 - This ANF has been developed to support the use of CSTA (ISO/IEC 18051) in a networked environment, i.e. in a PISN. Use of this ANF for other applications is not precluded. The Q reference point is defined in ISO/IEC 11579-1. Supplementary 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 21888. The signalling protocol for ANF-CIDL 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 Call Identification and Call Linkage and other supplementary services and ANFs. This International Standard is applicable to PINXs which can be interconnected to form a PISN.

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseau privé à intégration de services — Protocole de signalisation d'échange — Identification d'appel et caractéristique de réseau additionnelle de liaison d'appel

General Information

• Status: Published
• Publication Date: 05-Sep-2001
• ICS: 33.040.35 - Telephone networks
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Drafting Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 20-Sep-2006

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 21889
First edition
2001-09-01


Information technology —
Telecommunications and information
exchange between systems — Private
Integrated Services Network — Inter-
exchange signalling protocol — Call
Identification and Call Linkage Additional
Network Feature
Technologies de l’information — Télécommunications et échange
d’information entre systèmes — Réseau privé à intégration de services —
Protocole de signalisation d’échange — Identification d’appel et
caractéristique de réseau additionnelle de liaison d’appel




Reference number
ISO/IEC 21889:2001(E)
©
ISO/IEC 2001

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ISO/IEC 21889:2001(E)
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ISO/IEC 21889:2001(E)
Contents Page
Foreword v
Introduction vi
1 Scope 1
2 Conformance 1
3 Normative references 1
4 Definitions 3
4.1 External definitions 3
4.2 Other definitions 3
4.2.1 CIDL PINX 3
4.2.2 CIDL Transit PINX 4
5 Acronyms 4
6 Signalling protocol for the support of ANF-CIDL 4
6.1 ANF-CIDL description 4
6.2 ANF-CIDL operational requirements 4
6.2.1 Provision/Withdrawal 4
6.2.2 Requirements on an Originating PINX 4
6.2.3 Requirements on a CIDL PINX 4
6.2.4 Requirements on a CIDL Transit PINX 4
6.3 ANF-CIDL coding requirements 5
6.3.1 Operations 5
6.3.2 Information elements 6
6.3.3 Messages 6
6.4 ANF-CIDL state definitions 6
6.4.1 States at a Originating PINX 6
6.4.2 States at a CIDL PINX 7
6.4.3 States at a CIDL Transit PINX 7
6.5 ANF-CIDL signalling procedures 7
6.5.1 Actions at a Originating PINX 7
6.5.2 Procedures at the CIDL PINX 7
6.5.3 Actions at a CIDL Transit PINX 9
6.6 ANF-CIDL impact of interworking with public ISDNs 10
6.7 ANF-CIDL impact of interworking with non-ISDNs 10
6.8 Protocol Interactions between ANF-CIDL and other supplementary services and ANFs 10
6.8.1 Calling Name Identification Presentation (SS-CNIP) 10
6.8.2 Connected Name Identification Presentation (SS-CONP) 10
6.8.3 Completion of Calls to Busy Subscribers (SS-CCBS) 10
6.8.4 Completion of Calls on No Reply (SS-CCNR) 10
6.8.5 Call Forwarding Unconditional (SS-CFU) 10
6.8.6 Call Forwarding Busy (SS-CFB) 11
6.8.7 Call Forwarding No Reply (SS-CFNR) 11
6.8.8 Call Deflection (SS-CD) 11
6.8.9 Call Transfer (SS-CT) 11
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ISO/IEC 21889:2001(E)
6.8.10 Path Replacement (ANF-PR) 12
6.8.11 Advice Of Charge (SS-AOC) 12
6.8.12 Call Offer (SS-CO) 12
6.8.13 Do Not Disturb (SS-DND) 12
6.8.14 Do Not Disturb Override (SS-DNDO) 12
6.8.15 Recall (SS-RE) 12
6.8.16 Call Intrusion (SS-CI) 12
6.8.17 Call Interception (ANF-CINT) 12
6.8.18 Transit Counter (SS-TC) 12
6.8.19 Route Restriction Class (ANF-RRC) 12
6.8.20 Authentication of the PISN (SS-WTAN) 13
6.8.21 Authentication of a WTM user (SS-WTAT) 13
6.8.22 Wireless Terminal Location Registration (SS-WTLR) 13
6.8.23 Wireless Terminal Mobility Incoming Call (ANF-WTMI) 13
6.8.24 Wireless Terminal Mobility Outgoing Call (ANF-WTMO) 13
6.8.25 Message Waiting Indication (SS-MWI) 13
6.8.26 Private User Mobility Incoming Call (ANF-PUMI) 13
6.8.27 Private User Mobility Outgoing Call (ANF-PUMO) 13
6.8.28 Common Information (ANF-CMN) 14
6.8.29 Call Priority Interruption (Protection) (SS-CPI(P)) 14
6.8.30 Private User Mobility - Registration (SS-PUMR) 14
6.8.31 Single Step Call Transfer (SSCT) 14
6.8.32 Simple Dialog (SD) 14
6.9 ANF-CIDL parameter values (timers) 14
6.9.1 Timer T1 14
Annexes
A - Protocol Implementation Conformance Statement (PICS) proforma 15
B - Examples of message sequences 24
C - Specification and Description Language (SDL) representation of procedures 28
D - Imported definitions 34
E - ASN.1 definitions according to ITU-T Recs. X.208 / X.209 38

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ISO/IEC 21889:2001(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. 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 International Standard may be the subject of patent rights.
ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 21889 was prepared by ECMA (as ECMA-314) 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.
Annex A forms a normative part of this International Standard. Annexes B, C, D and E are for information only.
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ISO/IEC 21889:2001(E)
Introduction
This International Standard is one of a series of Standards 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 Call Identification
and Call Linkage 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 JTC1, ITU-T, ETSI and other international and national standardization
bodies. It represents a pragmatic and widely based consensus.


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INTERNATIONAL STANDARD ISO/IEC 21889:2001(E)

Information technology — Telecommunications and information exchange
between systems — Private Integrated Services Network — Inter-
exchange signalling protocol — Call Identification and Call Linkage
Additional Network Feature


1 Scope
This International Standard specifies the signalling protocol for the support of the Call Identification and Call Linkage
Additional Network Feature (ANF-CIDL) at the Q reference point between Private Integrated Network Services Exchanges
(PINXs) connected together within a Private Integrated Services Network (PISN).
ANF-CIDL is an additional network feature which allows the assignment of a Global Call Identification (GID) to identify a
call end-to-end over the call route (i.e. between the two end PINXs). As an option, a Thread Identification (TID) may be
assigned to different calls which are logically linked together due to the operation of other supplementary services and/or
ANFs. Additionally a Leg Identification (LID) may be assigned, to identify the different legs of a call.
NOTE 1 - This ANF has been developed to support the use of CSTA (ISO/IEC 18051) in a networked environment, i.e. in a PISN. Use of
this ANF for other applications is not precluded.
The Q reference point is defined in ISO/IEC 11579-1.
Supplementary 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 21888.
The signalling protocol for ANF-CIDL 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 Call Identification and Call Linkage and other supplementary services and ANFs.
This International Standard is applicable to PINXs which can be interconnected 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
ANF-CIDL 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 normative documents contain provisions which, through reference in this text, constitute provisions of this
International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not
apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the
normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
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
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ISO/IEC 21889:2001(E)
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 11582:1995, 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 13869:1995, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Call transfer supplementary service
ISO/IEC 13870:1995, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Call completion supplementary services
ISO/IEC 13873:1995, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Call diversion supplementary services
ISO/IEC 13874:1999, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Path replacement additional network feature
ISO/IEC 14843:1996, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Call offer supplementary service
ISO/IEC 14844:1996, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Do not disturb and do not disturb override
supplementary services
ISO/IEC 14846:1996, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Call intrusion supplementary service
ISO/IEC 15054:1997, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Call interception additional network feature
ISO/IEC 15429:1999, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Wireless Terminal Location Registration supplementary
service and Wireless Terminal Information exchange additional network feature
ISO/IEC 15431:1999, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Wireless terminal call handling additional network
features
ISO/IEC 15433:1999, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Wireless Terminal Authentication supplementary
services
ISO/IEC 15992:1998, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Call priority interruption and call priority interruption
protection supplementary services
ISO/IEC 17876:2000, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Private User Mobility (PUM) — Registration
supplementary service
ISO/IEC 17878:2000, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Private User Mobility (PUM) — Call handling
additional network features
ISO/IEC 18051:2000, Information technology — Telecommunications and information exchange between systems — Services
for Computer Supported Telecommunications Applications (CSTA) Phase III
ISO/IEC 19460:2001, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Inter-exchange signalling protocol — Single Step Call Transfer Supplementary Service
ISO/IEC 21888:2001, Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Specification, functional model and information flows — Call Identification and Call Linkage
Additional Network Feature
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ISO/IEC 21889:2001(E)
ETS 300 387:1994, Private Telecommunication Network (PTN); Method for the specification of basic and supplementary
services
ITU-T Rec. H.225:2000, Call signalling protocols and media stream packetization for packet-based multimedia
communication systems
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, Supplementary services protocols, structure and general principles
ITU-T Rec. Z.100:1999, Specification and description language (SDL)
4 Terms and definitions
For the purposes of this International Standard, 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)
— ANF-CIDL user (ISO/IEC 21888)
— Basic Call (ISO/IEC 11572)
— Basic Service (ITU-T Rec. I.210)
— Call Identification Data, CIDL data (ISO/IEC 21888)
— Call Independent Signalling Connection (ISO/IEC 11582)
— Complete Number (ISO/IEC 11571)
— Gateway PINX (ISO/IEC 11572)
— Global Call Identification, Global Call ID, GID (ISO/IEC 21888)
— Global Thread Identification, Thread ID, TID (ISO/IEC 21888)
— Interpretation APDU (ISO/IEC 11582)
— Leg Identification (ISO/IEC 21888)
— Network Facility Extension (NFE) (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)
— Supplementary Service (ITU-T Rec. I.210)
— Supplementary Service Control Entity (ISO/IEC 11582)
— Terminating PINX (ISO/IEC 11582)
— Transit PINX (ISO/IEC 11582)
— User (ISO/IEC 11574)
4.2 Other definitions
4.2.1 CIDL PINX : The PINX receiving initial Global Call ID and optionally Thread ID and Leg ID values from the
Originating PINX of a call. Upon supplementary / ANF interactions (e.g. after call transfer), the CIDL PINX may generate a
new Global Call ID for the resulting call and may correlate two or more logically linked calls together by updating the Thread
ID values of these calls.
NOTE 2 - The CIDL PINX may be the Originating or the Terminating PINX of a call, as well as any other PINX invoking Supplementary
Services / ANFs for this call, e.g. the SS-CT Transferring PINX.
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ISO/IEC 21889:2001(E)
4.2.2 CIDL Transit PINX : A Transit PINX on the call route between the Originating PINX and a CIDL PINX or between
two CIDL PINXs, which informs the local ANF-CIDL user about incoming CIDL Data and passes the data on unchanged to
the subsequent PINX.
5 Acronyms
ANF-CIDL Additional Network Feature Call Identification and Call Linkage
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation no. 1
CIDL Call Identification and Call Linkage
GID Global Call Identification
ID Identification
ISDN Integrated Services Digital Network
LID Leg Identification
NFE Network Facility Extension
PICS Protocol Implementation Conformance Statement
PINX Private Integrated Services Network Exchange
PISN Private Integrated Services Network
PNP Private Numbering Plan
SDL Specification and Description Language
TID Thread Identification
6 Signalling protocol for the support of ANF-CIDL
6.1 ANF-CIDL description
NOTE 3 - If not otherwise stated, the term call is used in the sense of a Basic Call or a Call Independent Signalling Connection.
ANF-CIDL is an additional network feature which allows the assignment of a Global Call Identification (GID) to identify a
call end-to-end over the call route (i.e. between the two end PINXs). As an option, a Thread Identification (TID) may be
assigned to different calls which are logically linked together due to the operation of other supplementary services and/or
ANFs. Additionally a Leg Identification (LID) may be assigned, to identify the different legs of a call.
This additional network feature is applicable to all basic services defined in ISO/IEC 11574.
6.2 ANF-CIDL operational requirements
6.2.1 Provision/Withdrawal
Provision and withdrawal shall be in accordance with 6.2.1 of ISO/IEC 21888.
6.2.2 Requirements on an Originating PINX
The basic call procedures specified in ISO/IEC 11572 shall be supported.
Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for an End PINX,
shall apply.
6.2.3 Requirements on a CIDL PINX
The basic call procedures specified in ISO/IEC 11572 shall be supported.
Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for an End PINX,
shall apply. Additionally generic procedures for the call independent control (connection oriented) of supplementary services,
as specified in ISO/IEC 11582 for an Originating PINX and a Terminating PINX shall apply.
6.2.4 Requirements on a CIDL Transit PINX
The basic call procedures specified in ISO/IEC 11572 shall be supported.
Generic procedures for the call-related control and call independent control (connection oriented) of supplementary services, as
specified in ISO/IEC 11582 for a Transit PINX, shall apply.
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ISO/IEC 21889:2001(E)
6.3 ANF-CIDL coding requirements
6.3.1 Operations
The following operations, defined in Abstract Syntax Notation number 1 (ASN.1) in table 1 shall apply.
Table 1 - Operations in support of ANF-CIDL
Call-Identification-and-Call-Linkage-Operations-asn1-97
{iso(1) standard (0) pss1-call-identification-and-call-linkage (21889)
call-identification-and-call-linkage-operations-asn1-97 (1)}

DEFINITIONS EXPLICIT TAGS ::=
BEGIN
IMPORTS
OPERATION
FROM Remote-Operations-Information-Objects
{joint-iso-itu-t remote-operations(4) informationObjects(5) version1(0)}

EXTENSION, Extension{}
FROM Manufacturer-specific-service-extension-class-asn1-97
{ iso standard pss1-generic-procedures (11582) msi-class-asn1-97 (11)};

CallIdentification-Operations OPERATION ::= { callIdentificationAssign | callIdentificationUpdate }

callIdentificationAssign OPERATION ::= {
  ARGUMENT CallIdentificationAssignArg
  RETURN RESULT FALSE
  ALWAYS RESPONDS FALSE
  CODE  local: 105
  }

callIdentificationUpdate OPERATION ::= {
  ARGUMENT CallIdentificationUpdateArg
  RETURN RESULT FALSE
  ALWAYS RESPONDS FALSE
  CODE  local: 106
  }

CallIdentificationAssignArg ::= SEQUENCE {
    globalCallID [0] CallIdentificationData,
    threadID  [1] CallIdentificationData OPTIONAL,
    legID  [2] CallIdentificationData OPTIONAL,
    extension ExtensionType  OPTIONAL
    }

CallIdentificationUpdateArg ::= SEQUENCE {
    globalCallID [0] CallIdentificationData OPTIONAL,
    threadID  [1] CallIdentificationData OPTIONAL,
    legID  [2] CallIdentificationData OPTIONAL,
    extension ExtensionType   OPTIONAL
    }

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ISO/IEC 21889:2001(E)
CallIdentificationData ::= SEQUENCE {
-- this structure is according to ISO/IEC 18051, 12.2.5 (see annex D)
  switchingSubDomainName [0] IMPLICIT SwitchingSubDomainName OPTIONAL,
  linkageID    CHOICE {
   subDomainID   [1] IMPLICIT SubDomainID,
   globallyUniqueID  [2] IMPLICIT GloballyUniqueID},
  timeStamp    [3] IMPLICIT  TimeStamp OPTIONAL
  }

SwitchingSubDomainName ::= IA5String (SIZE(1.64))

GloballyUniqueID ::= OCTET STRING (SIZE(1.16))
-- the GloballyUniqueID shall be coded according to ITU-T Recommendation H.225, section 7.6 (see annex D)

ExtensionType ::= CHOICE {
  extension  [3] Extension{{ExampleExtSet}},
  sequenceOfExt [4] IMPLICIT SEQUENCE OF Extension{{ExampleExtSet}}
    }

ExampleExtSet EXTENSION ::= {.}

SubDomainID ::= OCTET STRING (SIZE(1.8))

TimeStamp ::= GeneralizedTime (SIZE(16.19))

END -- of Call-Identification-and-Call-Linkage-Operations-asn1-97

6.3.2 Information elements
6.3.2.1 Facility information element
APDUs of the operations defined in 6.3.1 shall be coded in the Facility information element in accordance with ISO/IEC
11582.
When conveying the invoke APDUs of the operations defined in 6.3.1, the destinationEntity data element of the NFE shall
contain value anyTypeOfPINX, the Interpretation APDU shall contain value discardAnyUnrecognisedInvokePdu.
6.3.2.2 Other information elements
Information elements used during the establishment of the new connection shall be coded as specified in ISO/IEC 11572.
6.3.3 Messages
Except for cases where a basic call message is to be conveyed at the same time, the Facility information element shall be
conveyed in a FACILITY message as specified in ISO/IEC 11582.
6.4 ANF-CIDL state definitions
6.4.1 States at a Originating PINX
The procedures at the Originating PINX are written in terms of the following conceptual states existing within the ANF-CIDL
control entity in that PINX in association with a particular call.
6.4.1.1 CIDL-Idle
ANF-CIDL is not operating.
6.4.1.2 CIDL-Simultaneous-Assignment-Supervision
A callIdentificationAssign invoke APDU has been sent and Timer T1 has been started.
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ISO/IEC 21889:2001(E)
6.4.2 States at a CIDL PINX
The procedures at the CIDL PINX are written in terms of the following conceptual states existing within the ANF-CIDL
control entity in that PINX.
6.4.2.1 CIDL-Idle
ANF-CIDL is not operating.
6.4.2.2 CIDL-Simultaneous-Assignment-Supervision
A callIdentificationUpdate invoke APDU has been sent or a callIdentificationAssign or a callIdentificationUpdate invoke
APDU has been received and Timer T1 has been started.
6.4.3 States at a CIDL Transit PINX
The procedures at the CIDL Transit PINX are written in terms of the following conceptual states existing within the ANF-
CIDL control entity in that PINX.
6.4.3.1 CIDL-Idle
ANF-CIDL is not operating.
6.5 ANF-CIDL signalling procedures
References in this clause to protocol control states refer to basic call protocol control states defined in ISO/IEC 11572.
NOTE 4 - The specification in this sub-clause is based on each of the End PINXs being a different PINX, but this sub-clause is also
applicable to scenarios where two or more of the described PINXs are the same. In those scenarios some of the signalling procedures and
message flows described in this sub-clause are internal to the PINX implementation and therefore outside the scope of this International
Standard.
Annex B contains some examples of message sequences.
6.5.1 Actions at a Originating PINX
The SDL representation of procedures at a Originating PINX is shown in C.1 of annex C.
6.5.1.1 Normal procedures
Upon a request for a new call, the Originating PINX
1. shall generate the value of element globalCallID within the CallIdentificationAssignArg anew or, due to supplementary
service / ANF interactions, as described in the procedures in 6.8. The content of element globalCallID shall be generated
according to ISO/IEC 18051, 12.2.5 (see annex D) in a way that its value is unique within the PISN.
2. may additionally generate the value of element threadID within the CallIdentificationAssignArg anew or, due to
supplementary service / ANF interactions, as described in the procedures in 6.8. The content of element threadID shall be
generated according to ISO/IEC 18051, 12.2.5 (see annex D) in a way that its value is unique within the PISN.
3. may additionally generate the element legID within the CallIdentificationAssignArg. The content of element legID shall
be generated as described for the globalCallData in ISO/IEC 18051, 12.2.5 (see annex D) in a way that its value is unique
within the PISN.
4. store the generated values, correlate them to the call and inform the ANF-CIDL user about the generated values.
5. shall send one callIdentificationAssign invoke APDU which shall include all generated elements in the SETUP message of
the new call, start timer T1 and enter state CIDL-Simultaneous-Assignment-Supervision.
After entering stage CIDL-Simultaneous-Assignment-Supervision, the Originating PINX shall act as a CIDL PINX for the rest
of the call, i.e. it shall perform the actions as described in 6.5.2.
6.5.1.2 Exceptional procedures
Not applicable.
6.5.2 Procedures at the CIDL PINX
The SDL representation of procedures at a CIDL PINX is shown in C.2 of annex C.
6.5.2.1 Normal procedures
In state CIDL-Idle, upon r
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