SIST ETS 300 426 E1:2005

• Abstract:

  Stage 3 of intrusion supplementary service at Q ref pt. See DTR/ECMA-0002 (ECMA-TR/SVC) for service description. See ENV41005 for definition of stage 3. See ENV41004 for definition of Q reference point. To contain PICS proforma.

• Status: Published
• Publication Date: 30-Apr-2005
• ICS: 33.040.35 - Telephone networks
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2005
• Due Date: 01-May-2005
• Completion Date: 01-May-2005
• Mandate: T-75C.3
• Ref Project: ETSI ETS 300 426 ed.1 (1995-09) - Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Call intrusion supplementary service

Overview

SIST ETS 300 426 E1:2005 is the Slovenian adoption of the European Telecommunication Standard for Private Telecommunication Networks (PTN). This standard specifies the inter-exchange signalling protocol for the Call Intrusion (SS-CI) supplementary service at the Q reference point, enabling enhanced communication management within private telephone systems.

The document is part of a series from the European Telecommunications Standards Institute (ETSI) and the European Computer Manufacturers Association (ECMA), focusing on supplementary services in PTNs using ISDN principles. It defines the functional and procedural requirements at the protocol level for supporting call intrusion-an essential feature in many business and organizational environments.

Key Topics

• Call Intrusion Supplementary Service (SS-CI):

  • Allows a calling user to intrude into a busy line, breaking into an established call between a called user and a third party.
  • SS-CI supports scenarios where urgent or prioritized communication is required, even if the called party is engaged.

• Q Reference Point:

  • Specifies the location within the network architecture where this protocol applies, as defined in ISO/IEC 11579-1.
  • Ensures interoperability between different network exchanges in a private network.

• Protocol Conformance (PICS):

  • Includes a Protocol Implementation Conformance Statement (PICS) proforma to verify correct implementation.

• Operational Requirements:

  • Details requirements for originating, terminating, unwanted user, and transit exchanges (PTNX).
  • Covers procedures for call establishment, release, and handling of notifications related to call intrusion.

• ASN.1 Protocol Specification:

  • Uses Abstract Syntax Notation One (ASN.1) to define the operations, messages, and notifications associated with SS-CI.

Applications

Implementing the signalling protocol defined in SIST ETS 300 426 E1:2005 offers several practical advantages for organizations managing their own telephony infrastructure:

• Business Communications:
  Facilitates immediate access to key personnel in critical scenarios, such as security, emergency response, or executive decision-making scenarios where waiting for a line to be free is not acceptable.

• Call Management and Prioritization:
  Enables higher-priority users or services to override busy signals, supporting advanced telecommunication workflows in enterprises and large institutions.

• Interoperability:
  Ensures seamless interconnection between different PTNXs within the same PTN, particularly in environments with equipment from multiple vendors.

• Scalability and Consistency:
  By adhering to an open, standardized protocol at the Q reference point, organizations can expand their networks without compatibility concerns.

• Compliance and Auditability:
  The inclusion of PICS proforma ensures that network components can be objectively evaluated for standards conformance.

Related Standards

For a comprehensive implementation and understanding of private telecommunication network supplementary services, the following standards are closely related:

• ISO/IEC 11579-1 - Reference configurations for Private Integrated Services Network Exchange (PINX)
• ETS 300 172 - PTN inter-exchange signalling protocol for circuit mode basic services
• ETS 300 239 - Generic functional protocol for supplementary services
• ETS 300 425 - Specification and information flows for call intrusion supplementary service
• ETS 300 415 - Definitions and terminology for PTNs
• ETS 300 387 - Methods for service specification in PTNs
• CCITT Recommendations I.112 and I.210 - Principles and vocabulary for ISDN and telecommunication services

Summary

Adopting SIST ETS 300 426 E1:2005 empowers organizations with robust, standards-based call intrusion capabilities over their private telecommunication networks. This ensures fast, reliable, and prioritized communication-essential for high-demand business and operational scenarios-while maintaining interoperability, compliance, and scalability. By following this standard, organizations stay aligned with best practices in telecommunication network management and service delivery.

SLOVENSKI STANDARD
01-maj-2005
Zasebno telekomunikacijsko omrežje (PTN) – Medcentralni signalizacijski protokol
- Dopolnilna storitev: vpad v klic
Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Call
intrusion supplementary service
Ta slovenski standard je istoveten z: ETS 300 426 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 426
TELECOMMUNICATION September 1995
STANDARD
Source: ETSI TC-ECMA Reference: DE/ECMA-00053
ICS: 33.040.10, 33.040.30
Key words: PTN, supplementary service
Private Telecommunication Network (PTN);
Inter-exchange signalling protocol
Call intrusion supplementary service
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.

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ETS 300 426: September 1995
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 426: September 1995
Contents
Foreword .7
1 Scope.9
2 Conformance .9
3 References.9
4 Definitions.10
4.1 External definitions .10
4.2 Busy.10
4.3 Conference type connection .10
4.4 Established call.10
4.5 Forced release.10
4.6 Impending intrusion warning notification.10
4.7 Inter-PTNX link .11
4.8 Intruding call .11
4.9 Isolation.11
4.10 Path retention.11
4.11 Served user .11
4.12 Wanted user.11
4.13 Unwanted user.11
4.14 Unwanted user PTNX .11
4.15 Wait on busy.11
5 List of acronyms.11
6 Signalling protocol for the support of SS-CI.12
6.1 SS-CI description .12
6.2 SS-CI operational requirements.12
6.2.1 Requirements on the Originating PTNX.12
6.2.2 Requirements on the Terminating PTNX.12
6.2.3 Requirements on a Transit PTNX.12
6.2.4 Requirements on the unwanted user PTNX .12
6.3 SS-CI coding requirements.13
6.3.1 Operations.13
6.3.2 Notifications.16
6.3.3 Information elements .17
6.3.3.1 Facility information element.17
6.3.3.2 Notification indicator information element.17
6.3.3.3 Other information elements .17
6.3.4 Messages.17
6.4 SS-CI state definitions.17
6.4.1 States at the Originating PTNX .17
6.4.1.1 State CI-Idle.17
6.4.1.2 State CI-Wait-Ack .17
6.4.1.3 State CI-Orig-Invoked .18
6.4.1.4 State CI-inForcedRelease-Request .18
6.4.1.5 State CI-Isolation-Request.18
6.4.1.6 State CI-inWOB-Request.18
6.4.1.7 State CI-Orig-Isolated.18
6.4.1.8 State CI-isForcedRelease-Request.18
6.4.1.9 State CI-isWOB-Request.18
6.4.1.10 State CI-Orig-WOB .18
6.4.1.11 State CI-Wait-Ack-WOB.18

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ETS 300 426: September 1995
6.4.2 States at the Terminating PTNX. 18
6.4.2.1 State CI-Idle. 18
6.4.2.2 State CI-GetCIPL-I. 18
6.4.2.3 State CI-Dest-Notify. 18
6.4.2.4 State CI-Dest-Invoked . 18
6.4.2.5 State CI-Dest-Isolated. 19
6.4.2.6 State CI-Dest-WOB. 19
6.4.2.7 State CI-GetCIPL-WOB. 19
6.4.2.8 State CI-Dest-Notify-WOB . 19
6.5 SS-CI signalling procedures for activation, deactivation and registration. 19
6.6 SS-CI signalling procedures for invocation and operation. 19
6.6.1 Actions at the Originating PTNX. 19
6.6.1.1 Procedure for invocation of SS-CI. 19
6.6.1.1.1 Normal procedure . 19
6.6.1.1.2 Exceptional procedure . 20
6.6.1.2 Optional procedure for invocation of isolation. 20
6.6.1.2.1 Normal procedure . 20
6.6.1.2.2 Exceptional procedure . 20
6.6.1.3 Optional procedure for invocation of forced release . 20
6.6.1.3.1 Normal procedure . 20
6.6.1.3.2 Exceptional procedure . 21
6.6.1.4 Optional procedure for invocation of wait on busy . 21
6.6.1.4.1 Normal procedure . 21
6.6.1.4.2 Exceptional procedure . 21
6.6.1.5 Procedure for reinvocation of intrusion during wait on busy. 21
6.6.1.5.1 Normal procedure . 21
6.6.1.5.2 Exceptional procedure . 21
6.6.1.6 Procedure for completion of SS-CI . 22
6.6.1.6.1 Normal procedure . 22
6.6.1.6.2 Exceptional procedure . 22
6.6.2 Actions at the Terminating PTNX . 22
6.6.2.1 Procedure for invocation of SS-CI. 22
6.6.2.1.1 Normal procedure . 22
6.6.2.1.2 Exceptional procedure . 23
6.6.2.2 Optional procedures for invocation of isolation . 24
6.6.2.2.1 Normal procedure . 24
6.6.2.2.2 Exceptional procedure . 24
6.6.2.3 Optional procedures for invocation of forced release. 24
6.6.2.3.1 Normal procedure . 24
6.6.2.3.2 Exceptional procedure . 24
6.6.2.4 Optional procedures for invocation of wait on busy. 24
6.6.2.4.1 Normal procedure . 24
6.6.2.4.2 Exceptional procedure . 25
6.6.2.5 Procedures for reinvocation of intrusion during wait on busy . 25
6.6.2.5.1 Normal procedure . 25
6.6.2.5.2 Exceptional procedure . 26
6.6.2.6 Procedures for completion of SS-CI. 26
6.6.2.6.1 Normal procedure . 26
6.6.2.6.2 Exceptional procedure . 26
6.6.3 Actions at the unwanted user PTNX. 27
6.6.4 Actions at a Transit PTNX . 27
6.7 SS-CI impact of interworking with public ISDNs. 27
6.8 SS-CI impact of interworking with non-ISDNs. 27
6.9 SS-CI parameter values (timers). 27
6.9.1 Timer T1.27
6.9.2 Timer T2.28
6.9.3 Timer T3.28
6.9.4 Timer T4.28
6.9.5 Timer T5.28
6.9.6 Timer T6.28

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ETS 300 426: September 1995
Annex A (normative): Signalling protocol for the support of path retention.29
A.1 Path retention description.29
A.2 Path retention operational requirements.29
A.2.1 Requirements on the Originating PTNX .29
A.2.2 Requirements on the Terminating PTNX .29
A.2.3 Requirements on a Transit PTNX .29
A.3 Path retention coding requirements .30
A.3.1 Operations .30
A.3.2 Information elements.30
A.3.3 Messages .30
A.4 Path retention state definitions .30
A.4.1 States at the Originating PTNX.30
A.4.1.1 PRTO-Idle .30
A.4.1.2 PRTO-Requested .30
A.4.1.3 PRTO-Retained.30
A.4.1.4 PRTO-Invoking .30
A.4.2 States at the Terminating PTNX.30
A.4.2.1 PRTT-Idle.30
A.4.2.2 PRTT-Requested.31
A.4.2.3 PRTT-Retained.31
A.4.2.4 PRTT-Invoking.31
A.5 Path retention signalling procedures for invocation and operation.31
A.5.1 Actions at the Originating PTNX .31
A.5.2 Actions at the Terminating PTNX.31
A.5.3 Actions at a Transit PTNX .32
A.6 Path retention impact of interworking with public ISDNs.33
A.7 Path retention impact of interworking with non-ISDNs .33
A.8 Path retention parameter values (timers) .33
A.9 Specification and Description Language (SDL).33
A.9.1 SDL representation of path retention at the Originating PTNX .34
A.9.2 SDL representation of path retention at the Terminating PTNX .36
Annex B (normative): Protocol Implementation Conformance Statement (PICS) proforma.38
B.1 Introduction.38
B.2 Instructions for completing the PICS proforma.38
B.2.1 General structure of the PICS proforma .38
B.2.2 Additional information .39
B.2.3 Exception information.39
B.3 PICS proforma for ECMA-203 .39
B.3.1 Implementation identification.39
B.3.2 Protocol summary.40
B.3.3 General .40
B.3.4 Procedures. .41
B.3.5 Coding.42
B.3.6 Timers .43
Annex C (informative): Examples of message sequences.44
C.1 Example message sequence for normal operation of SS-CI without path retention .45

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C.2 Example message sequence for normal operation of SS-CI with path retention . 46
C.3 Example of unsuccessful invocation of SS-CI without path retention. 47
C.4 Examples of completion of SS-CI. 48
C.4.1 The established call is released . 48
C.4.2 The intruding call is released. 48
C.5 Examples of invocation of SS-CI options . 49
C.5.1 The Originating PTNX forced releases the unwanted user . 49
C.5.2 The Originating PTNX isolates the unwanted user . 49
C.5.3 The Originating PTNX invokes wait on busy .50
C.5.4 The Originating PTNX reinvokes intrusion during wait on busy . 51
Annex D (informative): Specification and Description Language (SDL) representation of procedures . 52
D.1 SDL representation of SS-CI at the Originating PTNX . 52
D.2 SDL representation of SS-CI at the Terminating PTNX . 59
History. 65

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ETS 300 426: September 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the European Computer
Manufacturers Association (ECMA) on behalf of its members and those of the European Telecommunications
Standards Institute (ETSI).
This ETS is one of a series of standards defining services and signalling protocols applicable to Private
Telecommunication Networks (PTNs). The series uses the ISDN concepts as developed by the ITU-T
(formerly CCITT) and is also within the framework of standards for open systems interconnection as defined
by ISO.
This ETS specifies the signalling protocol for use at the Q reference point in support of the Call Intrusion (CI)
supplementary service.
The ETS is based upon the practical experience of ECMA member companies and the results of their active
and continuous participation in the work of ISO, ITU-T, ETSI and other international and national
standardization bodies. It represents a pragmatic and widely based consensus.
This ETS was produced by ECMA using the ECMA guidelines for the production of standards and using the
ECMA stylesheet. In order to avoid undue delays in the approval process for this ETS it has been agreed that
this ETS will not be converted to the ETSI stylesheet.

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Blank page
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ETS 300 426: September 1995
1 Scope
This European Telecommunication Standard (ETS) specifies the signalling protocol for the support of
the Call Intrusion supplementary service (SS-CI) at the Q reference point between Private
Telecommunication Network Exchanges (PTNXs) connected together within a Private
Telecommunication Network (PTN).
SS-CI is a supplementary service which, on request from the calling user, enables the calling user to
establish communication with a busy called user by breaking into an established call between the
called user and a third user (unwanted 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 ETS contains the stage 3 specification for the Q reference point and satisfies the
requirements identified by the stage 1 and stage 2 specifications in ETS 300 425.
The signalling protocol for SS-CI operates on top of the signalling protocol for basic circuit switched
call control, as specified in ETS 300 172, and uses certain aspects of the generic procedures for the
control of supplementary services specified in ETS 300 239.
The impact on the protocol of interactions between the supplementary service specified in this ETS
and other supplementary services is outside the scope of this ETS.
This ETS is applicable to PTNXs which can interconnect to form a PTN.
2 Conformance
In order to conform to this ETS, a PTNX shall satisfy the requirements identified in the Protocol
Implementation Conformance Statement (PICS) proforma in annex B.
3 References
ISO/IEC 11579-1 Information technology - Telecommunications and information
exchange between systems - Private Integrated Services Network -
Reference configurations for PISN exchanges (PINX) (1994)
ETS 300 171 Private Telecommunication Network (PTN); Specification,
functional models and information flows; Control aspects of
circuit mode basic services (1992)
ETS 300 172 Private Telecommunication Network (PTN); Inter-exchange
signalling protocol; Circuit mode basic services (1994)
ETS 300 196 Integrated Services Digital Network (ISDN); Generic functional
protocol for the support of supplementary services; Digital
Subscriber Signalling System No. one (DSS1) protocol (1993)
ETS 300 239 Private Telecommunication Network (PTN); Inter-exchange
signalling protocol; Generic functional protocol for the support of
supplementary services (1993)
ETS 300 387 Private Telecommunications Network (PTN); Method for the
specification of basic and supplementary services
(1994)
ETS 300 415 Private Telecommunication Network (PTN); Terms and
definitions (1995)
ETS 300 425 Private Telecommunication Network (PTN); Specification,
functional model and information flows; Call intrusion
supplementary service (1995)
CCITT Recommendation I.112 Vocabulary of terms for ISDNs (1988)

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CCITT Recommendation I.210 Principles of telecommunication services supported by an ISDN
and the means to describe them (1988)
CCITT Recommendation Z.100 Specification and Description Language (SDL) (1988)
4 Definitions
For the purpose of this ETS the following definitions apply.
4.1 External definitions
This ETS uses the following terms defined in other documents:
− Application Protocol Data Unit (APDU) (ETS 300 239)
− Basic Service (CCITT Recommendation I.210)
− Call, Basic Call (ETS 300 239)
− Coordination Function (ETS 300 239)
− Notification (ETS 300 239)
− Originating PTNX (ETS 300 172)
− Private Telecommunication Network Exchange (PTNX) (ETS 300 415)
− Public ISDN (ETS 300 415)
− Signalling (CCITT Recommendation I.112)
− Supplementary Service (CCITT Recommendation I.210)
− Private Telecommunication Network (ETS 300 415)
− Terminal Equipment (ETS 300 415)
− Terminating PTNX (ETS 300 172)
− Transit PTNX (ETS 300 172)
− User (ETS 300 171)
4.2 Busy
A property of a user for whom either a Network Determined User Busy or User Determined User
Busy condition exists.
4.3 Conference type connection
A connection between the served user, the wanted user and the unwanted user, where all users have
user information connection with each other.
4.4 Established call
The active call that is selected for intruding on.
4.5 Forced release
The release of the established call on request from the served user during intrusion.
4.6 Impending intrusion warning notification
A notification provided before communication is established between the served user and the
wanted user.
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4.7 Inter-PTNX link
The totality of a signalling channel and a number of user information channels at the Q reference
point.
4.8 Intruding call
A call in which the served user requests call intrusion.
4.9 Isolation
The breaking of the user information connection to and from the unwanted user during intrusion.
4.10 Path retention
The retaining of the network connection between the Originating PTNX and the Terminating PTNX
so that a supplementary service (such as SS-CI) can be invoked without establishing a new
connection.
4.11 Served user
The user who requests SS-CI.
4.12 Wanted user
The called user in the intruding call.
4.13 Unwanted user
The user other than the wanted user in the established call.
4.14 Unwanted user PTNX
The PTNX of the unwanted user.
4.15 Wait on busy
A condition in which the intruding call is disconnected from the called user and is waiting for the
called user to become not busy.
5 List of acronyms
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation no. 1
CICL Call Intrusion Capability Level
CIPL Call Intrusion Protection Level
ISDN Integrated Services Digital Network
NFE Network Facility Extension
PICS Protocol Implementation Conformance Statement
PTN Private Telecommunication Network
PTNX Private Telecommunication Network Exchange
SDL Specification and Description Language
SS-CI Call Intrusion Supplementary Service
WOB Wait On Busy
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6 Signalling protocol for the support of SS-CI
6.1 SS-CI description
SS-CI is a supplementary service which, on request from the calling user, enables the calling user to
establish communication with a busy called user breaking into an established call between the
called user and a third user (unwanted user).
SS-CI is applicable to all circuit mode basic services defined in ETS 300 172.
6.2 SS-CI operational requirements
6.2.1 Requirements on the Originating PTNX
Call establishment procedures for the outgoing side of an inter-PTNX link and call release
procedures, as specified in ETS 300 172, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for an End PTNX, shall apply. In addition, the generic procedures for notification,
as specified in ETS 300 239 for an End PTNX, shall apply.
6.2.2 Requirements on the Terminating PTNX
Call establishment procedures for the incoming side of an inter-PTNX link and call release
procedures, as specified in ETS 300 172, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for an End PTNX, shall apply. In addition, the generic procedures for notification,
as specified in ETS 300 239 for an End PTNX, shall apply
6.2.3 Requirements on a Transit PTNX
Basic call procedures, as specified in ETS 300 172 for a Transit PTNX, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for a Transit PTNX, shall apply. In addition, the generic procedures for
notification, as specified in ETS 300 239 for a Transit PTNX, shall apply.
For SS-CI the requirements are limited to the passing on of Facility information elements for
which the destination, as indicated in the NFE, is not the Transit PTNX.
6.2.4 Requirements on the unwanted user PTNX
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for an End PTNX, shall apply. In addition, the generic procedures for notification,
as specified in ETS 300 239 for an End PTNX, shall apply.

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6.3 SS-CI coding requirements
6.3.1 Operations
The operations defined in Abstract Syntax Notation number 1 (ASN.1) in table 1 shall apply.
Table 1 - Operations in support of SS-CI
Call-Intrusion-Operations
{iso(1) identified-organization(3) icd-ecma(0012) standard (0)
qsig-call-intrusion (203) call-intrusion-operations (0) }
DEFINITIONS EXPLICIT TAGS ::=
BEGIN
IMPORTS OPERATION, ERROR FROM Remote-Operation-Notation
{joint-iso-ccitt(2) remote-operations(4) notation (0)}
Extension FROM Manufacturer-specific-service-extension-definition
{iso(1) identified-organization(3) icd-ecma(0012) standard(0)
qsig-generic-procedures(165) msi-definition(0)}
notAvailable, supplementaryServiceInteractionNotAllowed FROM General-
Errors
{ccitt(0) identified-organisation(3) etsi(0) 196 general-errors (2)};
ptn OBJECT IDENTIFIER
::= { iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain (9)}
PathRetain ::= OPERATION
ARGUMENT PathRetainArg
-- this operation may be used by other supplementary services
-- using other values of argument
ServiceAvailable ::= OPERATION
ARGUMENT ServiceAvailableArg
-- this operation may be used by other supplementary services
-- using other values of argument
CallIntrusionRequest ::= OPERATION
ARGUMENT CIRequestArg
RESULT CIRequestRes
ERRORS {notAvailable, notBusy, temporarilyUnavailable,
notAuthorized,
unspecified, supplementaryServiceInteractionNotAllowed}
CallIntrusionGetCIPL ::= OPERATION
ARGUMENT DummyArg
RESULT CIGetCIPLRes
CallIntrusionForcedRelease::= OPERATION
ARGUMENT DummyArg
RESULT DummyResult
ERRORS {notAvailable, unspecified,
supplementaryServiceInteractionNotAllowed}
CallIntrusionIsolate ::= OPERATION
ARGUMENT DummyArg
RESULT DummyResult
ERRORS {notAvailable, unspecified,
supplementaryServiceInteractionNotAllowed}

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CallIntrusionWOBRequest ::= OPERATION
ARGUMENT DummyArg
RESULT DummyResult
ERRORS {notAvailable, unspecified,
supplementaryServiceInteractionNotAllowed}
CallIntrusionCompleted ::= OPERATION
ARGUMENT DummyArg
PathRetainArg ::= CHOICE {serviceList ServiceList,
extendedServiceList SEQUENCE{
serviceList ServiceList,
extension Extension
}
}
ServiceAvailableArg ::= CHOICE { serviceList ServiceList,
extendedServiceList SEQUENCE{
serviceList ServiceList,
extension Extension
}
}
ServiceList ::= BIT STRING
{ci-low(4), ci-medium(5), ci-high(6)} (SIZE(1.32))
-- bits other than ci-low, ci-medium, ci-high are reserved
-- for other supplementary services
DummyArg ::= CHOICE{
null NULL,
extension [1] IMPLICIT Extension,
sequenceOfExtn [2] IMPLICIT SEQUENCE OF Extension}
DummyRes ::= CHOICE{
null NULL,
extension [1] IMPLICIT Extension,
sequenceOfExtn [2] IMPLICIT SEQUENCE OF Extension}
CIRequestArg ::= SEQUENCE{
ciCapabilityLevel CICapabilityLevel,
argumentExtension CHOICE{
extension [1] IMPLICIT Extension,
sequenceOfExtn [2] IMPLICIT SEQUENCE OF
Extension} OPTIONAL}
CIRequestRes ::= SEQUENCE{
ciUnwantedUserStatus CIUnwantedUserStatus,
resultExtension CHOICE{
extension [1] IMPLICIT Extension,
sequenceOfExtn [2] IMPLICIT SEQUENCE OF
Extension} OPTIONAL}
CIGetCIPLRes ::= SEQUENCE{
ciProtectionLevel CIProtectionLevel,
resultExtension CHOICE{
extension [1] IMPLICIT Extension,
sequenceOfExtn [2] IMPLICIT SEQUENCE OF
Extension} OPTIONAL}
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CICapabilityLevel ::= ENUMERATED{
intrusionLowProt(1),
intrusionMediumProt(2),
intrusionHighProt(3)}
CIProtectionLevel ::= ENUMERATED{
lowProtection(0),
mediumProtection(1),
highProtection(2),
fullProtection(3)}
CIUnwantedUserStatus ::= ENUMERATED{
unwantedUserIntruded(0),
unwantedUserIsolated(1)}
pathRetain PathRetain ::= {ptn path-retain(41)}
serviceAvailable ServiceAvailable ::={ptn service-availability(42)}
callIntrusionRequest CallIntrusionRequest ::={ptn ci-request(43)}
callIntrusionGetCIPL CallIntrusionGetCIPL ::={ptn ci-getCIPL(44)}
callIntrusionIsolate CallIntrusionIsolate ::={ptn ci-isolate(45)}
callIntrusionForcedRelease CallIntrusionForcedRelease ::={ptn ci-forcedRelease(46)}
callIntrusionWOBRequest CallIntrusionWOBRequest ::={ptn ci-WOB(47)}
callIntrusionCompleted CallIntrusionCompleted ::={ptn ci-completed(48)}
notBusy ERROR ::={ptn 1009}
-- used when an SS-CI request is received in
-- a Terminating PTNX and the called user is not busy
temporarilyUnavailable ERROR ::={ptn 1000}
-- used when conditions for invocation of SS-CI
-- are momentarily not met
notAuthorized ERROR ::={ptn 1007}
--used when a SS-CI request is rejected
--because of insufficient CICL
Unspecified ::= ERROR PARAMETER Extension
unspecified Unspecified ::= {ptn 1008}
END -- of Call-Intrusion-Operations

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6.3.2 Notifications
The following notification, defined in Abstract Syntax Notation number 1 (ASN.1) in table 2
shall apply.
Table 2 - Notifications in support of SS-CI
Call-Intrusion-Notifications
{iso(1) identified-organization(3) icd-ecma(0012) standard(0)
qsig-call-intrusion(203) call-intrusion-notifications(1)}
DEFINITIONS ::=
BEGIN
IMPORTS NOTIFICATION FROM Notification-Data-Structure
{iso(1) identified-organization(3) icd-ecma(0012) standard(0)
qsig-generic-procedures(165) notification-data-structure(7)};
RemoteUserAlerting ::= NOTIFICATION
ARGUMENT NULL
IntrusionIsImpending ::= NOTIFICATION
ARGUMENT NULL
IntrusionIsEffective::= NOTIFICATION
ARGUMENT NULL
IsolationThroughIntrusion::= NOTIFICATION
ARGUMENT NULL
ForcedReleaseAfterIntrusion ::= NOTIFICATION
ARGUMENT NULL
EndOfIntrusion ::= NOTIFICATION
ARGUMENT NULL
remoteUserAlerting RemoteUserAlerting ::=
{iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain(9) 2000}
intrusionIsImpending IntrusionIsImpending ::=
{iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain(9) 2003}
intrusionIsEffective IntrusionIsEffective::=
{iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain(9) 2004}
isolationThroughIntrusion IsolationThroughIntrusion::=
{iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain(9) 2005}
forcedReleaseAfterIntrusion ForcedReleaseAfterIntrusion ::=
{iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain(9) 2006}
endOfIntrusion EndOfIntrusion ::=
{iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain(9) 2007}
END --of Call-Intrusion-Notifications

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6.3.3 Information elements
6.3.3.1 Facility information element
The operations defined above shall be coded in the Facility information element in accordance
with ETS 300 239.
When conveying an APDU of operations callIntrusionRequest, callIntrusionGetCIPL,
callIntrusionForcedRelease, callIntrusionIsolate, callIntrusionWOBRequest,
callIntrusionCompleted, the NFE shall be included.
When conveying an invoke APDU of operations callIntrusionRequest, callIntrusionGetCIPL,
callIntrusionForcedRelease, callIntrusionIsolate, callIntrusionWOBRequest,
callIntrusionCompleted, the destinationEntity data element of the NFE shall contain value
endPTNX.
When conveying the invoke APDU of operation callIntrusionCompleted, the Interpretation
APDU shall be included and have the value discardAnyUnrecognisedInvokePdu.
When conveying the invoke APDUs of operations callIntrusionRequest,
callIntrusionGetCIPL, callIntrusionForcedRelease, callIntrusionIsolate and
callIntrusionWOBRequest, the Interpretation APDU shall be omitted.
NOTE 1
Additional requirements for the conveyance of APDUs of operations pathRetain and serviceAvailable
are given in A.3.2 of annex A.
6.3.3.2 Notification indicator information element
The notification defined above shall be coded in the Notification indicator information
element in accordance with ETS 300 239.
6.3.3.3 Other information elements
Any other information elements (e.g. Progress indicator) shall be coded in accordance with
the rules of ETS 300 172.
6.3.4 Messages
Messages used for call establishment and release shall be as specified in ETS 300 172.
The Facility information element and the Notification indicator information element shall be
conveyed in the messages as specified in clause 10 of ETS 300 239.
6.4 SS-CI state definitions
6.4.1 States at the Originating PTNX
The procedures for the Originating PTNX are written in terms of the following conceptual states
existing within the SS-CI supplementary service Control entity in that PTNX in association with
a particular call.
6.4.1.1 State CI-Idle
SS-CI is not operating.
6.4.1.2 State CI-Wait-Ack
The Originating PTNX has requested SS-CI and is waiting for an acknowledgement from the
Terminating PTNX.
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6.4.1.3 State CI-Orig-Invoked
SS-CI has been invoked successfully and the unwanted user has not been isolated.
6.4.1.4 State CI-inForcedRelease-Request
Following intrusion, the Originating PTNX has requested the forced release of the unwanted
user and is waiting for an acknowledgement from the Terminating PTNX.
6.4.1.5 State CI-Isolation-Request
Following intrusion, the Originating PTNX has requested the isolation of the unwanted user
and is waiting for an acknowledgement from the Terminating PTNX.
6.4.1.6 State CI-inWOB-Request
Following intrusion, the Originating PTNX has requested WOB.
6.4.1.7 State CI-Orig-Isolated
SS-CI has been invoked successfully and the unwanted user has been isolated.
6.4.1.8 State CI-isForcedRelease-Request
Following isolation, the Originating PTNX has requested the forced release of the unwanted
user and is waiting for an acknowledgement from the Terminating PTNX.
6.4.1.9 State CI-isWOB-Request
Following isolation, the Originating PTNX has requested WOB.
6.4.1.10 State CI-Orig-WOB
Wait on busy is in progress.
6.4.1.11 State CI-Wait-Ack-WOB
While wait on busy is in progress, the Originating PTNX has requested intrusion again and is
waiting for an acknowledgement from the Terminating PTNX.
6.4.2 States at the Terminating PTNX
The procedures for the Terminating PTNX are written in terms of the following conceptual states
existing within the SS-CI supplementary service Control functional entity in that PTNX in
association with a particular call.
6.4.2.1 State CI-Idle
SS-CI is not operating.
6.4.2.2 State CI-GetCIPL-I
The Terminating PTNX has requested the CIPL of the unwanted user after intrusion has been
requested and is waiting for the result.
6.4.2.3 State CI-Dest-Notify
Following invocation of intrusion, the Terminating PTNX has notified an impending intrusion
to the unwanted user and is waiting the end of the impending phase before starting intrusion.
6.4.2.4 State CI-Dest-Invoked
SS-CI has been invoked successfully and the unwanted user has not been isolated.

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6.4.2.5 State CI-Dest-Isolated
SS-CI has been invoked successfully and the unwanted user has been isolated.
6.4.2.6 State CI-Dest-WOB
Wait on busy is in progress.
6.4.2.7 State CI-GetCIPL-WOB
The Terminating PTNX has requested the CIPL of the unwanted user after intrusion has been
requested again during wait on busy and is waiting for the result.
6.4.2.8 State CI-Dest-Notify-WOB
Following invocation of intrusion during wait on busy, the Terminating PTNX has notified an
impending intrusion to the unwanted user and is waiting for the end of the impending phase
before starting intrusion.
6.5 SS-CI signalling procedures for activation, deactivation and registration
Not applicable.
6.6 SS-CI signalling procedures for invocation and operation
The following procedures are call associated.
SS-CI may be invoked in two ways
...