ISO/IEC 15054:2003
(Main)Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Interception additional network feature
Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Interception additional network feature
ISO/IEC 15054:2003 specifies the signalling protocol for the support of the additional network feature Call Interception (ANF-CINT) at the Q reference point between Private Integrated services Network eXchanges (PINX) connected together within a Private Integrated Services Network (PISN). ANF-CINT is an additional network feature which enables calls that cannot be completed due to certain conditions to be redirected to a predetermined intercepted-to user. 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. ISO/IEC 15054:2003 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 15053. The signalling protocol for ANF-CINT 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. ISO/IEC 15054:2003 also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between ANF-CINT and other supplementary services and ANFs. NOTE Additional interactions that have no impact on the signalling protocol at the Q reference point can be found in the relevant stage 1 specifications. ISO/IEC 15054:2003 is applicable to PINXs which can interconnect 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'interéchange — Facilité de réseau additionnelle d'interception d'appel
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INTERNATIONAL ISO/IEC
STANDARD 15054
Second edition
2003-04-01
Information technology —
Telecommunications and information
exchange between systems — Private
Integrated Services Network —
Inter-exchange signalling protocol —
Call Interception additional network
feature
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseau privé à intégration de
services — Protocole de signalisation d'interéchange — Facilité de
réseau additionnelle d'interception d'appel
Reference number
ISO/IEC 15054:2003(E)
©
ISO/IEC 2003
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ISO/IEC 15054:2003(E)
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ISO/IEC 15054:2003(E)
Contents
Foreword v
Introduction vi
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 Forward switching 3
4.2.2 Intercepting PINX 3
4.2.3 Intercepted-to PINX 3
4.2.4 Intercepted-to user 3
4.2.5 Interception immediate 3
4.2.6 Interception delayed 3
4.2.7 Call failure 3
4.2.8 Waiting on busy 3
List of acronyms
5 3
6 Signalling protocol for the support of ANF-CINT 3
6.1 ANF-CINT description 3
6.2 ANF-CINT operational requirements 4
6.2.1 Requirements on an Originating PINX 4
6.2.2 Requirements on a Terminating PINX 4
6.2.3 Requirements on an Intercepted-to PINX 4
6.2.4 Requirements on a Transit PINX 4
Requirements on an Intercepting PINX
6.2.5 4
6.3 ANF-CINT coding requirements 5
6.3.1 Operations 5
6.3.2 Information elements 8
6.3.3 Messages 8
6.4 ANF-CINT state definitions 8
6.4.1 States at the Originating PINX 8
6.4.2 States at the Intercepting PINX 8
6.4.3 States at the Intercepted-to PINX 8
6.4.4 States at a Transit PINX 8
6.4.5 States at the Terminating PINX 8
6.5 ANF-CINT Signalling procedures for activation, deactivation, registration and interrogation 8
6.6 ANF-CINT Signalling procedures for invocation and operation 9
6.6.1 Actions at a Terminating PINX 9
6.6.2 Actions at a Transit PINX 9
6.6.3 Actions at the Originating PINX 9
6.6.4 Actions at an Intercepting PINX for interception immediate 10
Actions at an Intercepting PINX for interception delayed
6.6.5 11
6.6.6 Actions at an Intercepted-to PINX 12
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ISO/IEC 15054:2003(E)
6.7 ANF-CINT Impact of interworking with a public ISDN 12
6.7.1 Incoming Gateway PINX 12
6.7.2 Outgoing Gateway PINX 12
6.8 ANF-CINT Impact of interworking with a non-ISDN 13
6.8.1 Incoming Gateway PINX 13
6.8.2 Outgoing Gateway PINX 13
6.9 Protocol interaction between ANF-CINT and other supplementary services and ANFs 13
6.9.1 Interaction with Calling Name Identification Presentation (SS-CNIP) 13
6.9.2 Interaction with Connected Name Identification Presentation (SS-CONP) 13
6.9.3 Interaction with Call Forwarding Unconditional (SS-CFU) 13
6.9.4 Interaction with Call Forwarding Busy (SS-CFB) 14
6.9.5 Interaction with Call Forwarding No Reply (SS-CFNR) 14
Interaction with Do Not Disturb (SS-DND)
6.9.6 14
6.9.7 Interaction with Do Not Disturb Override (SS-DNDO) 14
6.9.8 Interaction with Call Completion To Busy Subscriber (SS-CCBS) 14
6.9.9 Interaction with Call Completion On No Reply (SS-CCNR) 14
6.9.10 Interaction with Call Offer (SS-CO) 15
6.9.11 Interaction with Call Intrusion (SS-CI) 15
6.9.12 Interaction with Call Transfer (SS-CT) 15
6.9.13 Interaction with Path Replacement (ANF-PR) 16
Interaction with Recall (SS-RE)
6.9.14 16
6.9.15 Interaction with Advice Of Charge (SS-AOC) 16
Annexes
A - Protocol Implementation Conformance Statement (PICS) proforma 17
B - Examples of message sequences 28
C - Specification and Description Language (SDL) Representation of procedures 34
D - ASN.1 definitions according to ITU-T Recs. X.208 / X.209 40
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ISO/IEC 15054:2003(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. 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 15054 was prepared by ECMA (as ECMA-221) 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 15054:1997), which has been technically revised.
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ISO/IEC 15054:2003(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 Interception
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.
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INTERNATIONAL STANDARD ISO/IEC 15054:2003(E)
Information technology — Telecommunications and information
exchange between systems — Private Integrated Services Network —
Inter-exchange signalling protocol — Call Interception additional network
feature
1Scope
This International Standard specifies the signalling protocol for the support of the additional network feature Call Interception
(ANF-CINT) at the Q reference point between Private Integrated services Network eXchanges (PINX) connected together
within a Private Integrated Services Network (PISN).
ANF-CINT is an additional network feature which enables calls that cannot be completed due to certain conditions to be
redirected to a predetermined intercepted-to user.
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 15053.
The signalling protocol for ANF-CINT 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-CINT and other supplementary services and ANFs.
NOTE - Additional interactions that have no impact on the signalling protocol at the Q reference point can be found in the relevant stage 1
specifications.
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
ANF-CINT 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 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
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ISO/IEC 15054:2003(E)
ISO/IEC 13868:2003, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Inter-exchange signalling protocol - Name Identification supplementary services
ISO/IEC 13869:2003, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Inter-exchange signalling protocol - Call Transfer supplementary service
ISO/IEC 13870:2003, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Inter-exchange signalling protocol - Call Completion supplementary services
ISO/IEC 13873:2003, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Inter-exchange signalling protocol - Call Diversion supplementary services
ISO/IEC 15050:2003, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Inter-exchange signalling protocol - Advice Of Charge supplementary services
ISO/IEC 15052:2003, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Inter-exchange signalling protocol - Recall supplementary service
ISO/IEC 15053:2003, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Specification, functional model and information flows - Call Interception additional network
feature
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. Z.100:1999, Specification and description language (SDL)
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)
− Basic Service (ITU-T Rec. I.210)
− Call, Basic Call (ISO/IEC 11582)
− End PINX (ISO/IEC 11582)
− Incoming Gateway PINX (ISO/IEC 11572)
− Outgoing Gateway PINX (ISO/IEC 11572)
− Originating PINX (ISO/IEC 11572)
− Preceding PINX (ISO/IEC 11572)
− 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)
− Subsequent PINX (ISO/IEC 11572)
− Supplementary Service (ITU-T Rec. I.210)
− Supplementary Service Control Entity (ISO/IEC 11582)
− Terminating PINX (ISO/IEC 11572)
− Transit PINX (ISO/IEC 11572)
− User (ISO/IEC 11574)
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ISO/IEC 15054:2003(E)
4.2 Other definitions
4.2.1 Forward switching
Network routeing algorithm which performs the interception by joining together the first connection from the calling user to the
Intercepting PINX and the new connection from the Intercepting PINX to the intercepted-to user.
4.2.2 Intercepting PINX
The PINX where the interception is invoked.
4.2.3 Intercepted-to PINX
The PINX serving the intercepted-to user.
4.2.4 Intercepted-to user
The user to whom the intercepted call is directed.
4.2.5 Interception immediate
The redirection of a call to an alternative destination as a result of detecting a call failure condition that prevents the call
reaching an alerting or waiting on busy state.
4.2.6 Interception delayed
The redirection of a call to an alternative destination as a result of remaining too long in an alerting or waiting on busy state.
4.2.7 Call failure
In the context of a particular PINX, the inability to route a call or, having routed a call, the receipt of a call clearing message
from the Subsequent PINX without the call having reached an alerting or waiting on busy state.
4.2.8 Waiting on busy
A call state in which a call is awaiting answer at a user that is busy on another call.
NOTE - This can arise, for example, as a result of the use of supplementary service Call Offer (SS-CO) during call establishment. A call that
is waiting on busy can be transferred.
5 List of acronyms
ANF Additional Network Feature
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation no. 1
CINT Call Interception
ISDN Integrated Services Digital Network
NFE Network Facility Extension
PICS Protocol Implementation Conformance Statement
PINX Private Integrated services Network eXchange
PISN Private Integrated Services Network
SDL Specification and Description Language
SS Supplementary Services
6 Signalling protocol for the support of ANF-CINT
6.1 ANF-CINT description
ANF-CINT is invoked for an unanswered or unsuccessful call, allowing the call to be routed to a special destination in the
PISN. The special destination may be dependant of the interception cause.
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ISO/IEC 15054:2003(E)
The conditions leading to invocation of ANF-CINT are considered as implementation options. Examples of factors that can be
taken in to account are:
− the source of the call (e.g. the geographic location of the calling user, the network from which the call has entered the
PISN);
− the particular interception cause;
− the type of connection (e.g. the originating user is an attendant);
− the call destination;
− time of the day.
6.2 ANF-CINT operational requirements
6.2.1 Requirements on an Originating PINX
Call establishment procedures for the outgoing side of an inter-PINX link and call release procedures, as specified in
ISO/IEC 11572, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for an End PINX,
shall apply.
6.2.2 Requirements on a Terminating PINX
Call establishment procedures for the incoming side of an inter-PINX link and call release procedures, as specified in
ISO/IEC 11572, shall apply.
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 an Intercepted-to PINX
Call establishment procedures for the incoming side of an inter-PINX link and call release procedures, as specified in
ISO/IEC 11572, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for an End PINX,
shall apply.
6.2.4 Requirements on a Transit PINX
Basic call procedures for call establishment and call clearing at a Transit PINX, as specified in ISO/IEC 11572, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for a Transit PINX,
shall apply.
6.2.5 Requirements on an Intercepting PINX
Call establishment procedures for the outgoing side of an inter-PINX link and call release procedures, as specified in
ISO/IEC 11572, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for an End PINX,
shall apply.
Where, as a result of invocation of ANF-CINT, an Intercepting PINX can become a Transit PINX, generic procedures for the
call-related control of supplementary services, as specified in ISO/IEC 11582 for a Transit PINX, shall apply.
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ISO/IEC 15054:2003(E)
6.3 ANF-CINT coding requirements
6.3.1 Operations
The operations defined in Abstract Syntax Notation number 1 (ASN.1) in table 1 shall apply. The notation is in accordance
with ITU-T Rec. X.680 and X.690. The ITU-T Rec. X.208 and X.209 superseded version is in annex D.
In addition the operation divertingLegInformation3, as defined in ISO/IEC 13873, shall apply.
Table 1 - Operations in Support of ANF-CINT
Call-Interception-Operations-asn1-97 {iso (1) standard (0) pss1-cint (15054) cint-operations-asn1-97 (1) }
DEFINITIONS EXPLICIT TAGS ::=
BEGIN
IMPORTS OPERATION, ERROR FROM Remote-Operations-Information-Objects
{joint-iso-itu-t (2) remote-operations (4) informationObjects (5) version1(0)}
EXTENSION, Extension{} FROM Manufacturer-specific-service-extension-class-asn1-97
{iso (1) standard (0) pss1-generic-procedures (11582) msi-class-asn1-97 (11)}
PartyNumber, PresentedNumberUnscreened, PresentationAllowedIndicator
FROM Addressing-Data-Elements-asn1-97
{iso (1) standard (0) pss1-generic-procedures (11582)
addressing-data-elements-asn1-97 (20)}
Name FROM Name-Operations-asn1-97
{iso (1) standard (0) pss1-name (13868) name-operations-asn1-97 (1)};
Call-Interception-Operations OPERATION ::= { cintLegInformation1 | cintLegInformation2 | cintCondition |
cintDisable | cintEnable}
cintLegInformation1 OPERATION ::= {
-- Sent from the Intercepting PINX to the Originating PINX --
ARGUMENT CintInformation1Arg
RETURN RESULT FALSE
ALWAYS RESPONDS FALSE
CODE local: 66}
cintLegInformation2 OPERATION ::= {
-- Sent from the Intercepting PINX to the Intercepted-to PINX --
ARGUMENT CintInformation2Arg
RETURN RESULT FALSE
ALWAYS RESPONDS FALSE
CODE local: 67}
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ISO/IEC 15054:2003(E)
Table 1 - Operations in Support of ANF-CINT (continued)
cintCondition OPERATION ::= {
-- Sent to a preceding PINX to indicate a condition for possible interception
ARGUMENT CintCondArg
RETURN RESULT FALSE
ALWAYS RESPONDS FALSE
CODE local: 68}
cintDisable OPERATION ::= {
-- Sent to a Preceding PINX to disable interception delayed --
ARGUMENT CintExtension
RETURN RESULT FALSE
ALWAYS RESPONDS FALSE
CODE local: 69}
cintEnable OPERATION ::= {
-- Sent to a Preceding PINX to reenable interception --
ARGUMENT CintExtension
RETURN RESULT FALSE
ALWAYS RESPONDS FALSE
CODE local: 70}
CintInformation1Arg ::= SEQUENCE
{
interceptionCause CintCause,
interceptedToNumber PartyNumber,
extension CintExtension OPTIONAL
}
CintInformation2Arg ::= SEQUENCE
{
interceptionCause CintCause,
calledNumber [1]PresentedNumberUnscreened OPTIONAL,
originalCalledNumber [2]PresentedNumberUnscreened OPTIONAL,
calledName [3]Name OPTIONAL,
originalCalledName [4]Name OPTIONAL,
extension CintExtension OPTIONAL
}
CintCondArg ::= SEQUENCE
{
interceptionCause Condition,
originalCalledNumber [1]PresentedNumberUnscreened OPTIONAL,
calledName [2]Name OPTIONAL,
originalCalledName [3]Name OPTIONAL,
extension CintExtension OPTIONAL
}
CintExtension ::= CHOICE
{
none NULL,
single [5] IMPLICIT Extension{{CINTExtSet}},
multiple [6] IMPLICIT SEQUENCE OF Extension{{CINTExtSet}}
}
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ISO/IEC 15054:2003(E)
Table 1 - Operations in Support of ANF-CINT (concluded)
CintCause ::= INTEGER {
unknown (0),
cintBnan (1), -- timeout in waiting on busy condition
cintBus (2), -- busy user
cintCug (3), -- closed user group rejection
cintDnd (4), -- do not disturb activated
cintIbd (5), -- incoming barred destination
cintInn (6), -- invalid number
cintMob1 (7), -- mobile user location not known
cintMob2 (8), -- mobile user no longer registered
cintMob3 (9), -- mobile terminal not responding
cintNcmp (10), -- no compatible destination
cintNcong (11), -- network congestion
cintNre (12), -- no reply (i.e. timeout during alerting)
cintOos (13), -- called user out of service
cintRrs (14), -- route restriction (calling user not authorized for
-- the route)
cintTbnan (15), -- timeout in wait on busy condition after transfer
cintTnre (16), -- no reply after transfer (i.e. timeout during alerting
-- after transfer
cintTrans (17), -- upper limit of transit counter reached
cintUpl (18), -- upper limit of number of diversions reached
cintInvDiv (19), -- invalid call diversion destination
cintHold (20) -- timeout after call hold
} (0.127)
Condition ::= INTEGER {
unknown (0),
cintBus (2), -- busy user
cintCug (3), -- closed user group rejection
cintDnd (4), -- do not disturb activated
cintIbd (5), -- incoming barred destination
cintInn (6), -- invalid number
cintMob1 (7), -- mobile user location not known
cintMob2 (8), -- mobile user no longer registered
cintMob3 (9), -- mobile terminal not responding
cintNcmp (10), -- no compatible destination
cintNcong (11), -- network congestion
cintOos (13), -- called user out of service
cintRrs (14), -- route restriction (calling user not authorized for
-- the route
cintTrans (17), -- upper limit of transit counter reached
cintUpl (18), -- upper limit of number of diversions
-- reached
cintInvDiv (19) -- invalid call diversion destination
} (0.127)
CINTExtSet EXTENSION ::= {…}
END -- of Call-Interception-Operations-asn1-97
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ISO/IEC 15054:2003(E)
6.3.2 Information elements
6.3.2.1 Facility information element
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 APDU of the operations defined in 6.3.1 except for cintCondition, the destinationEntity data
element of the NFE shall contain value endPINX.
When conveying the invoke APDU of operation cintCondition, the destinationEntity data element of the NFE shall contain
value anyTypeOfPINX.
When conveying invoke APDUs of the operations defined in 6.3.1. the Interpretation APDU shall be included and shall contain
the value discardAnyUnrecognisedInvokePdu.
6.3.2.2 Other information elements
Any other information elements (e.g. Progress indicator, Calling party number) shall be coded in accordance with the rules of
ISO/IEC 11572.
6.3.3 Messages
The Facility information element shall be conveyed in the messages specified in clause 10 of ISO/IEC 11582. The basic call
messages shall be used for call establishment and release as specified in ISO/IEC 11572.
6.4 ANF-CINT state definitions
6.4.1 States at the Originating PINX
The procedures for the Originating PINX are written in terms of the following conceptual states existing within the ANF-CINT
Supplementary Service Control entity in that PINX in association with a particular call.
6.4.1.1 State CINT-orig-idle
Call interception is not in progress.
6.4.2 States at the Intercepting PINX
The procedures for the Intercepting PINX are written in terms of the following conceptual states existing within the ANF-CINT
Supplementary Service Control entity in that PINX in association with a particular call.
6.4.2.1 State CINT-intrcp-idle
Call interception is not in progress.
6.4.2.2 State CINT-intercepting
Interception delayed is in progress.
6.4.3 States at the Intercepted-to PINX
The procedures for the Intercepted-to PINX are written in terms of the following conceptual states existing within the
ANF-CINT Supplementary Service Control entity in that PINX in association with a particular call.
6.4.3.1 State CINT-intrcpto-idle
ANF-CINT is not in progress.
6.4.3.2 State CINT-intrcpto-presented
An intercepted call has arrived and the PINX is waiting for valid presentation restriction information to become available.
6.4.4 States at a Transit PINX
6.4.4.1 State CINT-transit-idle
ANF-CINT is not in progress.
6.4.5 States at the Terminating PINX
6.4.5.1 State CINT-term-idle
ANF-CINT is not in progress.
6.5 ANF-CINT Signalling procedures for activation, deactivation, registration and interrogation
Not applicable.
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ISO/IEC 15054:2003(E)
6.6 ANF-CINT Signalling procedures for invocation and operation
Examples of message sequences are shown in annex B.
6.6.1 Actions at a Terminating PINX
The SDL representation of procedures at the Terminating PINX is shown in C.4 of annex C.
If call failure is detected, the Terminating PINX, instead of initiating call clearing towards the preceding PINX, may invoke
interception immediate in accordance with the procedures of 6.6.4.
If call failure is detected and interception immediate is not invoked, the Terminating PINX may send a cintCondition invoke
APDU in the DISCONNECT message or, if an in-band tone or announcement is applied, in the PROGRESS message.
When the Terminating PINX sends an ALERTING, PROGRESS or FACILITY message indicating that the call is entering an
alerting or waiting on busy state and if the Terminating PINX is to become the Intercepting PINX for interception delayed, it
shall:
i) send a cintDisable invoke APDU in the ALERTING, PROGRESS or FACILITY message; and
ii) if the call remains unanswered for an implementation-dependent length of time, invoke interception delayed in accordance
with the procedures of 6.6.5.
NOTE - The sending of a cintDisable invoke APDU prevents another PINX becoming the Intercepting PINX.
When a call enters an alerting or waiting on busy state, if the Terminating PINX is not to become the Intercepting PINX and
requires that interception delayed be disabled, it shall send a cintDisable invoke APDU in the ALERTING, PROGRESS or
FACILITY message.
During an alerting or waiting on busy state, if a cintDisable invoke APDU has previously been sent and there is a need to
reenable interception delayed, then a cintEnable invoke APDU shall be sent in a FACILITY or ALERTING message.
6.6.2 Actions at a Transit PINX
The SDL representation of procedures at the Transit PINX is shown in C.5 of annex C.
On receipt of a cintCondition invoke APDU from the subsequent PINX in conjunction with a call failure, a Transit PINX may
take note of the condition indicated with a view to possible interception immediate.
If call failure is detected, whether or not a cintCondition invoke APDU has been received, a Transit PINX, instead of
continuing call clearing towards the Preceding PINX, may invoke interception immediate in accordance with the procedures of
6.6.4, provided that the Transit PINX has not already relayed on any APDUs from the Subsequent PINX to the
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