SIST ETS 300 392-10-6:1999

• Abstract:

  Revision of Stage 1 after PE resolution of stages 2 and 3.

• Status: Published
• Publication Date: 31-Oct-1999
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1999
• Due Date: 01-Nov-1999
• Completion Date: 01-Nov-1999
• Mandate: T-172-1A
• Ref Project: ETSI ETS 300 392-10-6 ed.2 (1999-01) - Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 6: Call Authorized by Dispatcher (CAD)

Overview

SIST ETS 300 392-10-6:1999 sets out the Stage 1 service definition for the Call Authorized by Dispatcher (CAD) supplementary service as part of the Terrestrial Trunked Radio (TETRA) standard for Voice plus Data (V+D) communications. This Slovenian standard, identical to ETS 300 392-10-6 by ETSI, provides a user-oriented description of how critical calls within TETRA networks are subject to dispatcher authorization before proceeding. The CAD supplementary service is essential for maintaining operational control within professional mobile radio networks, especially where call security and controlled communications are vital.

The document outlines the overall service behavior, procedures for provisioning, use cases, service management, and interactions with other TETRA supplementary services. This Stage 1 specification serves as a basis for more detailed technical implementations (Stages 2 and 3), supporting both voice and circuit mode data calls in public safety, transport, utilities, and enterprise radio networks.

Key Topics

• What is Call Authorized by Dispatcher (CAD)?
  • A supplementary service ensuring that certain TETRA calls do not proceed without approval from a dispatcher.
  • Applied to calls based on user, address, or geographical area restrictions.
• Service Provisioning and Operation
  • CAD must be set up with the service provider; it can be activated or deactivated as needed.
  • Various call interception scenarios are supported, including:
    • Restricted basic service (e.g., only certain types of calls require authorization)
    • Restricted source/destination addresses
    • Restricted operational areas
• User Roles
  • Authorized user: Can define, activate, deactivate, and query CAD settings.
  • Dispatcher: Receives and approves or rejects intercepted call requests.
  • Restricted user: Subject to dispatcher authorization before making or receiving certain calls.
• Procedures and Exceptional Handling
  • Calls intercepted for authorization can be temporarily suspended or directly diverted to the dispatcher.
  • The dispatcher can approve, reject, or interact with the call initiator.
  • Users receive confirmations of service status, restrictions, and outcomes.
• Interactions with Other Supplementary Services
  • CAD has defined behaviors when combined with other TETRA supplementary services such as call forwarding, priority calling, and barring of calls.
  • In cases of priority calls (e.g., Pre-emptive Priority Call), priority rules may override CAD requirements.

Applications

CAD is a critical feature for controlled mission-critical communications, widely used in:

• Public Safety Agencies (Police, Fire, Ambulance):
  • Ensures sensitive communications are authorized and monitored.
  • Prevents unauthorized or inappropriate use of the radio network during critical operations.
• Transport and Utilities:
  • Enables dispatch authorities to manage and validate communications traffic, especially where access to remote or hazardous areas is involved.
• Private and Enterprise Networks:
  • Supports compliance and auditability for organizations with structured communication hierarchies.
• TETRA Network Interoperability:
  • CAD works across different systems and inter-system interfaces, ensuring control remains with the appropriate dispatch entity even when users roam across networks.

Related Standards

The SIST ETS 300 392-10-6:1999 document is part of the wider TETRA standard family. Relevant related standards include:

• SIST ETS 300 392-10 (Parts 1-14): Covers general network design, air interface, security, supplementary services, SDL modelling, and protocol conformance.
• ETSI EN 300 392-2: Defines the TETRA Air Interface.
• ITU-T Recommendation Z.100: Specification and Description Language (SDL), referenced for formal behavior descriptions.
• Other TETRA supplementary services standards: Such as SS-CLIP (Calling Line Identification Presentation), SS-PC (Priority Call), SS-BOC/SS-BIC (Call Barring).

Keywords: TETRA, Call Authorized by Dispatcher, CAD, supplementary services, dispatcher authorization, mission-critical communications, public safety radio, SIST standard, ETSI, professional mobile radio, Stage 1 service description.

For more information and access to official documents, consult ETSI or the Slovenian Institute for Standardization.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 6: Call Authorized by Dispatcher (CAD)33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)ICS:Ta slovenski standard je istoveten z:ETS 300 392-10-6 E23SIST ETS 300 392-10-6:1999en01-MXOLM19993SIST ETS 300 392-10-6:1999SLOVENSKI
STANDARD
EUROPEANETS 300 392-10-6TELECOMMUNICATIONJanuary 1999STANDARDSecond EditionSource: TETRAReference: RE/TETRA-03001-10-06ICS:33.020Key words:TETRA, V+DTerrestrial Trunked Radio (TETRA);Voice plus Data (V+D);Part 10: Supplementary services stage 1;Sub-part 6: Call Authorized by Dispatcher (CAD)ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEInternet: [e-mail] - http://www.etsi.orgTel.: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1999. All rights reserved.SIST ETS 300 392-10-6:1999

Page 2ETS 300 392-10-6: January 1999Whilst 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 Standards Making Support Dept." at the address shown on the title page.SIST ETS 300 392-10-6:1999

Page 3ETS 300 392-10-6: January 1999ContentsForeword.51Scope.72Normative references.73Definitions and abbreviations.73.1Definitions.73.2Abbreviations.73.2.1General abbreviations.73.2.2Supplementary service abbreviations.84Supplementary Service Call Authorized by Dispatcher (SS-CAD) stage 1 specification.84.1Description.84.1.1General description.84.1.2Qualifications on applicability to telecommunication services.84.2Procedures.94.2.1Provision and withdrawal.94.2.1.1Restricted basic service.94.2.1.2Restricted destination address.104.2.1.3Restricted source address.104.2.1.4Restricted area.104.2.1.5Verification and acceptance.104.2.2Normal procedures.104.2.2.1Activation, deactivation, definition, registration,interrogation, and cancellation.104.2.2.1.1Activation and deactivation.104.2.2.1.2Definition.114.2.2.1.3Registration.114.2.2.1.4Interrogation.114.2.2.2Invocation and operation.114.2.2.2.1Outgoing calls.114.2.2.2.2Incoming calls.124.2.2.2.3Restricted basic service.124.2.2.2.4Restricted area.124.2.2.3Cancellation.124.2.3Exceptional procedures.124.2.3.1Activation, deactivation, definition, registration,interrogation, and cancellation.124.2.3.1.1Activation.124.2.3.1.2Deactivation.124.2.3.1.3Definition.124.2.3.1.4Registration.134.2.3.1.5Interrogation.134.2.3.2Cancellation.134.2.3.3Invocation and operation.134.3Interactions with supplementary services.134.3.1Calling Line Identification Presentation (SS-CLIP).134.3.2Connected Line identification Presentation (SS-COLP).134.3.3Calling/Connected Line Identification Restriction (SS-CLIR).134.3.4Call Report (SS-CR).134.3.5Talking Party Identification (SS-TPI).134.3.6Call Forwarding Unconditional (SS-CFU).134.3.7Call Forwarding on Busy (SS-CFB).134.3.8Call Forwarding on No Reply (SS-CFNRy).134.3.9Call Forwarding on Not Reachable (SS-CFNRc).134.3.10List Search Call (SS-LSC).14SIST ETS 300 392-10-6:1999

Page 4ETS 300 392-10-6: January 19994.3.11Call Authorized by Dispatcher (SS-CAD).144.3.12Short Number Addressing (SS-SNA).144.3.13Area Selection (SS-AS).144.3.14Access Priority (SS-AP).144.3.15Priority Call (SS-PC).144.3.16Call Waiting (SS-CW).144.3.17Call Hold (SS-HOLD).144.3.18Call Completion to Busy Subscriber (SS-CCBS).144.3.19Late Entry (SS-LE).144.3.20Transfer of Control (SS-TC).144.3.21Pre-emptive Priority Call (SS-PPC).144.3.22Include Call (SS-IC).154.3.23Advice of Charge (SS-AoC).154.3.24Barring of Outgoing Calls (SS-BOC).154.3.25Barring of Incoming Calls (SS-BIC).154.3.26Discreet Listening (SS-DL).154.3.27Ambience Listening (SS-AL).154.3.28Dynamic Group Number Assignment (SS-DGNA).154.3.29Call Completion on No Reply (SS-CCNR).154.3.30Call Retention (SS-CRT).154.4Interworking considerations.154.5Overall SDL.15History.18SIST ETS 300 392-10-6:1999

Page 5ETS 300 392-10-6: January 1999ForewordThis second edition European Telecommunication Standard (ETS) has been produced by the TerrestrialTrunked Radio (TETRA) Project of the European Telecommunications Standards Institute (ETSI).This ETS is a multi-part standard and will consist of the following parts:Part 1:"General network design";Part 2:"Air Interface (AI)";Part 3:"Interworking at the Inter-System Interface (ISI)";Part 4:"Gateways basic operation";Part 5:"Peripheral Equipment Interface (PEI)";Part 6:"Line connected Station (LS)";Part 7:"Security";Part 9:"General requirements for supplementary services";Part 10:"Supplementary services stage 1";Part 11:"Supplementary services stage 2";Part 12:"Supplementary services stage 3";Part 13:"SDL model of the Air Interface (AI)";Part 14:"Protocol Implementation Conformance Statement (PICS) proforma specification".Transposition datesDate of adoption of this ETS:18 December 1998Date of latest announcement of this ETS (doa):31 March 1999Date of latest publication of new National Standardor endorsement of this ETS (dop/e):30 September 1999Date of withdrawal of any conflicting National Standard (dow):30 September 1999SIST ETS 300 392-10-6:1999

Page 6ETS 300 392-10-6: January 1999Blank pageSIST ETS 300 392-10-6:1999

Page 7ETS 300 392-10-6: January 19991ScopeThis European Telecommunication Standard (ETS) defines the stage 1 specifications of theSupplementary Service Call Authorized by Dispatcher (SS-CAD) for the Terrestrial Trunked Radio(TETRA) system. Stage 1 is an overall service description from the users point of view but does not dealwith the details of the human interface itself.This ETS specifies the service description of the supplementary service and the procedures to beexpected with successful and unsuccessful outcomes. In addition, this ETS specifies the interactions withother TETRA supplementary services and interworking considerations.Charging principles are outside the scope of this ETS.The SS-CAD ensures that predefined TETRA calls do not proceed without first being authorized by adispatcher.2Normative referencesThis ETS incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ITU-T Recommendation Z.100 (1993): "Specification and Description Language(SDL)".3Definitions and abbreviations3.1DefinitionsFor the purposes of this ETS the following definitions apply:authorized user: The user who can make service definition. The authorized user can alsoactivate/deactivate and interrogate the service.dispatcher: The user to whom the request for authorization is directed.restricted user: The user who’s calls are forced to be authorized by a dispatcher before the call canproceed. The restricted user can be either the calling user A or the called user B or both.3.2Abbreviations3.2.1General abbreviationsFor the purposes of this ETS the following general abbreviations apply:GTSIGroup TETRA Subscriber IdentityITSIIndividual TETRA Subscriber IdentitySDL(Functional) Specification and Description LanguageSSSupplementary ServiceNOTE:The abbreviation SS is only used when referring to a specific supplementary service.SwMISwitching and Management InfrastructureTETRATerrestrial Trunked RAdioV+DVoice Plus DataSIST ETS 300 392-10-6:1999

Page 8ETS 300 392-10-6: January 19993.2.2Supplementary service abbreviationsFor the purposes of this ETS the following supplementary service abbreviations apply:SS-ALAmbience ListeningSS-AoCAdvice of ChargeSS-APAccess PrioritySS-ASArea SelectionSS-BICBarring of Incoming CallsSS-BOCBarring of Outgoing CallsSS-CADCall Authorized by DispatcherSS-CCBSCall Completion to Busy SubscriberSS-CCNRCall Completion on No ReplySS-CFBCall Forwarding on BusySS-CFNRyCall Forwarding on No ReplySS-CFNRcCall Forwarding on Not ReachableSS-CFUCall Forwarding UnconditionalSS-CLIPCalling Line Identification PresentationSS-CLIRCalling/Connected Line Identification RestrictionSS-COLPConnected Line Identification PresentationSS-CRCall ReportSS-CRTCall RetentionSS-CWCall WaitingSS-DGNADynamic Group Number AssignmentSS-DLDiscreet ListeningSS-HOLDCall HoldSS-ICInclude CallSS-LELate EntrySS-LSCList Search CallSS-PCPriority CallSS-PPCPre-emptive Priority CallSS-SNAShort Number AddressingSS-TCTransfer of ControlSS-TPITalking Party Identification4Supplementary Service Call Authorized by Dispatcher (SS-CAD) stage 1specification4.1Description4.1.1General descriptionSS-CAD is defined as the ability of the dispatcher to verify and approve a call request before the call isallowed to proceed.The supplementary service shall also apply to the option whereby the dispatcher authorization of incomingcall requests to specified TETRA addresses is required before the service can proceed. The specifiedTETRA addresses may be TETRA users or gateways. The incoming calls may be generated inside oroutside of the operator's TETRA domain.The service shall enable interception of calls due to the following conditions:1)restricted basic service request;2)restricted destination or source address;3)restricted area.4.1.2Qualifications on applicability to telecommunication servicesSS-CAD shall be applicable to all TETRA speech and circuit mode data services.SIST ETS 300 392-10-6:1999

Page 9ETS 300 392-10-6: January 19994.2Procedures4.2.1Provision and withdrawalThe SS-CAD supplementary service shall be provided by prior arr
...

SLOVENSKI STANDARD
01-november-1999
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Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary
services stage 1; Sub-part 6: Call Authorized by Dispatcher (CAD)
Ta slovenski standard je istoveten z: ETS 300 392-10-6 Edition 2
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 392-10-6
TELECOMMUNICATION January 1999
STANDARD Second Edition
Source: TETRA Reference: RE/TETRA-03001-10-06
ICS: 33.020
Key words: TETRA, V+D
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 10: Supplementary services stage 1;
Sub-part 6: Call Authorized by Dispatcher (CAD)
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
Internet: [e-mail] - http://www.etsi.org
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 1999. All rights reserved.

Page 2
ETS 300 392-10-6: January 1999
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 Standards Making Support Dept." at the address shown on the title page.

Page 3
ETS 300 392-10-6: January 1999
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .7
3.2.1 General abbreviations .7
3.2.2 Supplementary service abbreviations .8
4 Supplementary Service Call Authorized by Dispatcher (SS-CAD) stage 1 specification .8
4.1 Description.8
4.1.1 General description .8
4.1.2 Qualifications on applicability to telecommunication services.8
4.2 Procedures.9
4.2.1 Provision and withdrawal.9
4.2.1.1 Restricted basic service.9
4.2.1.2 Restricted destination address .10
4.2.1.3 Restricted source address.10
4.2.1.4 Restricted area .10
4.2.1.5 Verification and acceptance .10
4.2.2 Normal procedures.10
4.2.2.1 Activation, deactivation, definition, registration,
interrogation, and cancellation.10
4.2.2.1.1 Activation and deactivation .10
4.2.2.1.2 Definition.11
4.2.2.1.3 Registration.11
4.2.2.1.4 Interrogation.11
4.2.2.2 Invocation and operation .11
4.2.2.2.1 Outgoing calls .11
4.2.2.2.2 Incoming calls .12
4.2.2.2.3 Restricted basic service.12
4.2.2.2.4 Restricted area .12
4.2.2.3 Cancellation.12
4.2.3 Exceptional procedures.12
4.2.3.1 Activation, deactivation, definition, registration,
interrogation, and cancellation.12
4.2.3.1.1 Activation .12
4.2.3.1.2 Deactivation .12
4.2.3.1.3 Definition.12
4.2.3.1.4 Registration.13
4.2.3.1.5 Interrogation.13
4.2.3.2 Cancellation.13
4.2.3.3 Invocation and operation .13
4.3 Interactions with supplementary services .13
4.3.1 Calling Line Identification Presentation (SS-CLIP).13
4.3.2 Connected Line identification Presentation (SS-COLP).13
4.3.3 Calling/Connected Line Identification Restriction (SS-CLIR) .13
4.3.4 Call Report (SS-CR).13
4.3.5 Talking Party Identification (SS-TPI) .13
4.3.6 Call Forwarding Unconditional (SS-CFU).13
4.3.7 Call Forwarding on Busy (SS-CFB).13
4.3.8 Call Forwarding on No Reply (SS-CFNRy) .13
4.3.9 Call Forwarding on Not Reachable (SS-CFNRc) .13
4.3.10 List Search Call (SS-LSC).14

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ETS 300 392-10-6: January 1999
4.3.11 Call Authorized by Dispatcher (SS-CAD). 14
4.3.12 Short Number Addressing (SS-SNA) . 14
4.3.13 Area Selection (SS-AS) . 14
4.3.14 Access Priority (SS-AP). 14
4.3.15 Priority Call (SS-PC) . 14
4.3.16 Call Waiting (SS-CW). 14
4.3.17 Call Hold (SS-HOLD). 14
4.3.18 Call Completion to Busy Subscriber (SS-CCBS). 14
4.3.19 Late Entry (SS-LE). 14
4.3.20 Transfer of Control (SS-TC) . 14
4.3.21 Pre-emptive Priority Call (SS-PPC) . 14
4.3.22 Include Call (SS-IC) . 15
4.3.23 Advice of Charge (SS-AoC). 15
4.3.24 Barring of Outgoing Calls (SS-BOC) . 15
4.3.25 Barring of Incoming Calls (SS-BIC) . 15
4.3.26 Discreet Listening (SS-DL) . 15
4.3.27 Ambience Listening (SS-AL). 15
4.3.28 Dynamic Group Number Assignment (SS-DGNA) . 15
4.3.29 Call Completion on No Reply (SS-CCNR). 15
4.3.30 Call Retention (SS-CRT) . 15
4.4 Interworking considerations . 15
4.5 Overall SDL. 15
History. 18

Page 5
ETS 300 392-10-6: January 1999
Foreword
This second edition European Telecommunication Standard (ETS) has been produced by the Terrestrial
Trunked Radio (TETRA) Project of the European Telecommunications Standards Institute (ETSI).
This ETS is a multi-part standard and will consist of the following parts:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)";
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 6: "Line connected Station (LS)";
Part 7: "Security";
Part 9: "General requirements for supplementary services";
Part 10: "Supplementary services stage 1";
Part 11: "Supplementary services stage 2";
Part 12: "Supplementary services stage 3";
Part 13: "SDL model of the Air Interface (AI)";
Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification".
Transposition dates
Date of adoption of this ETS: 18 December 1998
Date of latest announcement of this ETS (doa): 31 March 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 September 1999
Date of withdrawal of any conflicting National Standard (dow): 30 September 1999

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ETS 300 392-10-6: January 1999
Blank page
Page 7
ETS 300 392-10-6: January 1999
1 Scope
This European Telecommunication Standard (ETS) defines the stage 1 specifications of the
Supplementary Service Call Authorized by Dispatcher (SS-CAD) for the Terrestrial Trunked Radio
(TETRA) system. Stage 1 is an overall service description from the users point of view but does not deal
with the details of the human interface itself.
This ETS specifies the service description of the supplementary service and the procedures to be
expected with successful and unsuccessful outcomes. In addition, this ETS specifies the interactions with
other TETRA supplementary services and interworking considerations.
Charging principles are outside the scope of this ETS.
The SS-CAD ensures that predefined TETRA calls do not proceed without first being authorized by a
dispatcher.
2 Normative references
This ETS incorporates, by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ITU-T Recommendation Z.100 (1993): "Specification and Description Language
(SDL)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS the following definitions apply:
authorized user: The user who can make service definition. The authorized user can also
activate/deactivate and interrogate the service.
dispatcher: The user to whom the request for authorization is directed.
restricted user: The user who’s calls are forced to be authorized by a dispatcher before the call can
proceed. The restricted user can be either the calling user A or the called user B or both.
3.2 Abbreviations
3.2.1 General abbreviations
For the purposes of this ETS the following general abbreviations apply:
GTSI Group TETRA Subscriber Identity
ITSI Individual TETRA Subscriber Identity
SDL (Functional) Specification and Description Language
SS Supplementary Service
NOTE: The abbreviation SS is only used when referring to a specific supplementary service.
SwMI Switching and Management Infrastructure
TETRA Terrestrial Trunked RAdio
V+D Voice Plus Data
Page 8
ETS 300 392-10-6: January 1999
3.2.2 Supplementary service abbreviations
For the purposes of this ETS the following supplementary service abbreviations apply:
SS-AL Ambience Listening
SS-AoC Advice of Charge
SS-AP Access Priority
SS-AS Area Selection
SS-BIC Barring of Incoming Calls
SS-BOC Barring of Outgoing Calls
SS-CAD Call Authorized by Dispatcher
SS-CCBS Call Completion to Busy Subscriber
SS-CCNR Call Completion on No Reply
SS-CFB Call Forwarding on Busy
SS-CFNRy Call Forwarding on No Reply
SS-CFNRc Call Forwarding on Not Reachable
SS-CFU Call Forwarding Unconditional
SS-CLIP Calling Line Identification Presentation
SS-CLIR Calling/Connected Line Identification Restriction
SS-COLP Connected Line Identification Presentation
SS-CR Call Report
SS-CRT Call Retention
SS-CW Call Waiting
SS-DGNA Dynamic Group Number Assignment
SS-DL Discreet Listening
SS-HOLD Call Hold
SS-IC Include Call
SS-LE Late Entry
SS-LSC List Search Call
SS-PC Priority Call
SS-PPC Pre-emptive Priority Call
SS-SNA Short Number Addressing
SS-TC Transfer of Control
SS-TPI Talking Party Identification
4 Supplementary Service Call Authorized by Dispatcher (SS-CAD) stage 1
specification
4.1 Description
4.1.1 General description
SS-CAD is defined as the ability of the dispatcher to verify and approve a call request before the call is
allowed to proceed.
The supplementary service shall also apply to the option whereby the dispatcher authorization of incoming
call requests to specified TETRA addresses is required before the service can proceed. The specified
TETRA addresses may be TETRA users or gateways. The incoming calls may be generated inside or
outside of the operator's TETRA domain.
The service shall enable interception of calls due to the following conditions:
1) restricted basic service request;
2) restricted destination or source address;
3) restricted area.
4.1.2 Qualifications on applicability to telecommunication services
SS-CAD shall be applicable to all TETRA speech and circuit mode data services.

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ETS 300 392-10-6: January 1999
4.2
...