SIST EN 300 392-10-21 V1.2.1:2003

• Abstract:

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

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Mandate: T-172-1A
• Ref Project: ETSI EN 300 392-10-21 V1.2.0 (2003-04) - Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 21: Ambience Listening (AL)

Overview

SIST EN 300 392-10-21 V1.2.1:2003 defines the Stage 1 requirements for the Ambience Listening (AL) supplementary service in Terrestrial Trunked Radio (TETRA) systems, focusing on Voice plus Data (V+D) services. Ambience Listening is a specialized TETRA feature that allows an authorized user (served user) to remotely place another user's (affected user) TETRA Mobile Station (MS) into a call, enabling ambient audio transmission without any user intervention or visual indication on the affected device.

This document, harmonized with ETSI EN 300 392-10-21 V1.2.1, describes the high-level service characteristics, user procedures, interactions with other TETRA services, and conditions for successful or unsuccessful invocation. Charging principles, subscription management, and implementation specifics are out of scope.

Keywords: TETRA, Terrestrial Trunked Radio, Ambience Listening, supplementary services, Voice plus Data, V+D, radio communication, wireless communications.

Key Topics

• Service Description

  • Ambience Listening enables remote audio monitoring by activating the microphone of the affected TETRA MS without notification.
  • Can include a second listening party, either individual or group, under certain circumstances.
  • Designed for silent monitoring - no indicator on the affected user’s device.

• Provisioning and Invocation

  • Provided upon subscription and subject to service provider authorization and policy.
  • May require passwords and/or predefined permissions for individual users or groups.
  • Invoked during individual call setup or optionally during a group call.

• Operational Procedures

  • Permanent activation upon provision; deactivated upon withdrawal by service provider.
  • Call completion occurs when cleared by the served user, or if standard communication interrupts.
  • Exceptional procedures handle authorization failures, unsupported requests, or user busy status.

• Interactions with Other TETRA Services

  • Defined interactions with supplementary services such as Call Forwarding, Call Hold, Call Waiting, and Barring of Calls to avoid conflicts or unauthorized access.
  • Ambience Listening can override certain call barring and forwarding services to fulfill operational needs.

Applications

The Ambience Listening supplementary service is primarily used in critical communications environments, where silent monitoring of a location or situation is necessary for safety, security, or operational oversight.

Typical use cases include:

• Public Safety and Emergency Services:
  Command and control can monitor the environment of frontline personnel in emergencies without alerting the affected user.
• Law Enforcement and Security Operations:
  Enables discreet monitoring of incidents or high-risk activities for tactical advantage.
• Industrial and Utility Operations:
  Useful for remote observation in hazardous or inaccessible environments.
• Transport and Logistics:
  Monitoring employee status or incident response in transit scenarios.

This feature enhances safety and accountability by enabling real-time awareness and incident verification without user involvement or interruption.

Related Standards

The Ambience Listening service is part of a comprehensive suite of TETRA supplementary services documented in the EN 300 392 series. Related standards include:

• EN 300 392-1: General network design
• EN 300 392-2: Air Interface (AI)
• EN 300 392-7: Security requirements
• EN 300 392-10: Supplementary services Stage 1 (various features such as Call Hold, Call Reporting, Priority Call)
• EN 300 392-11 & EN 300 392-12: Supplementary services Stage 2 & Stage 3 (procedures and protocol aspects)
• EN 300 392-10-20: Discreet Listening (DL), a related but exclusive supplementary service

For full TETRA system integration, interoperability, and enhanced functionality, compliance with the entire set of EN 300 392 standards is recommended.

Reference Links:

• ETSI TETRA Standards
• SIST Slovenian Institute for Standardization

By adhering to this standard, users, manufacturers, and service providers ensure consistent, secure, and interoperable implementation of Ambience Listening across TETRA networks.

SLOVENSKI STANDARD
01-december-2003
Prizemni snopovni radio (TETRA) – Govor in podatki (V+D) – 10. del: Dopolnilne
storitve stopnje 1 – 21. poglavje: Poslušanje okolice (AL)
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary
services stage 1; Sub-part 21: Ambience Listening (AL)
Ta slovenski standard je istoveten z: EN 300 392-10-21 Version 1.2.1
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.

ETSI EN 300 392-10-21 V1.2.1 (2003-09)
European Standard (Telecommunications series)

Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 10: Supplementary services stage 1;
Sub-part 21: Ambience Listening (AL)

2 ETSI EN 300 392-10-21 V1.2.1 (2003-09)

Reference
REN/TETRA-03001-10-21
Keywords
ambience, data, radio, speech, stage 1,
supplementary service, TETRA
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ETSI
3 ETSI EN 300 392-10-21 V1.2.1 (2003-09)
Contents
Intellectual Property Rights.5
Foreword.5
1 Scope.7
2 References.7
3 Definitions and abbreviations.7
3.1 Definitions.7
3.2 Abbreviations.8
3.2.1 General abbreviations.8
3.2.2 Supplementary service abbreviations.8
4 SS-AL stage 1 specification .9
4.1 Description.9
4.1.1 General description.9
4.1.2 Qualifications on applicability to telecommunications services .9
4.2 Procedures.9
4.2.1 Provision/Withdrawal.9
4.2.2 Normal procedures.9
4.2.2.1 Management of SS-AL service .9
4.2.2.1.1 Activation/Deactivation.9
4.2.2.1.2 Interrogation.10
4.2.2.2 Invocation and operation.10
4.2.2.2.1 Invocation and operation .10
4.2.2.2.2 Completion.10
4.2.3 Exceptional procedures.11
4.2.3.1 Management of SS-AL .11
4.2.3.1.1 Activation/deactivation.11
4.2.3.1.2 Interrogation.11
4.2.3.2 Invocation and operation.11
4.3 Interactions with other supplementary services.11
4.3.1 Access Priority (AP) .11
4.3.2 Ambience Listening (AL).12
4.3.3 Area Selection (AS).12
4.3.4 Barring of Incoming Calls (BIC) .12
4.3.5 Barring of Outgoing Calls (BOC).12
4.3.6 Call Authorized by Dispatcher (CAD).12
4.3.7 Call Completion to Busy Subscriber (CCBS).12
4.3.8 Call Completion on No Reply (CCNR) .12
4.3.9 Call Forwarding on Busy (CFB).12
4.3.10 Call Forwarding on No Reply (CFNRy).12
4.3.11 Call Forwarding on Not Reachable (CFNRc).13
4.3.12 Call Forwarding Unconditional (CFU).13
4.3.13 Call Hold (HOLD).13
4.3.14 Calling Line Identification Presentation (CLIP).13
4.3.15 Calling/Connected Line Identification Restriction (CLIR).13
4.3.16 Call Report (CR).13
4.3.17 Call ReTention (CRT) .13
4.3.18 Call Waiting (CW).14
4.3.19 COnnected Line identification Presentation (COLP) .14
4.3.20 Discreet Listening (DL) .14
4.3.21 Dynamic Group Number Assignment (DGNA) .14
4.3.22 Include Call (IC) .14
4.3.23 Late Entry (LE).14
4.3.24 List Search Call (LSC).14
4.3.25 Pre-emptive Priority Call (PPC) .14
4.3.26 Priority Call (PC).14
ETSI
4 ETSI EN 300 392-10-21 V1.2.1 (2003-09)
4.3.27 Short Number Addressing (SNA).14
4.3.28 Talking Party Identification (TPI) .14
4.4 Interactions with other TETRA services .15
4.5 Inter-working considerations.15
4.6 Overall SDL.15
Annex A (informative): Bibliography.17
History .18

ETSI
5 ETSI EN 300 392-10-21 V1.2.1 (2003-09)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Project Terrestrial Trunked Radio
(TETRA).
The present document is part 10, sub-part 21 of a multi-part deliverable covering Voice plus Data (V+D), as identified
below:
EN 300 392-1: "General network design";
EN 300 392-2: "Air Interface (AI)";
EN 300 392-3: "Interworking at the Inter-System Interface (ISI)";
ETS 300 392-4: "Gateways basic operation";
EN 300 392-5: "Peripheral Equipment Interface (PEI)";
EN 300 392-7: "Security";
EN 300 392-9: "General requirements for supplementary services";
EN 300 392-10: "Supplementary services stage 1";
ETS 300 392-10-1: "Call identification";
ETS 300 392-10-2: "Call report";
ETS 300 392-10-3: "Talking Party Identification (TPI)";
EN 300 392-10-4: "Call Forwarding (CF)";
ETS 300 392-10-5: "List Search Call (LSC)";
ETS 300 392-10-6: "Call Authorized by Dispatcher (CAD)";
ETS 300 392-10-7: "Short number addressing";
ETS 300 392-10-8: "Area selection";
ETS 300 392-10-9: "Access priority";
EN 300 392-10-10: "Priority Call (PC)";
ETS 300 392-10-11: "Call Waiting (CW)";
ETS 300 392-10-12: "Call Hold (CH)";
ETS 300 392-10-13: "Call completion to busy subscriber";
EN 300 392-10-14: "Late Entry (LE)";
ETSI
6 ETSI EN 300 392-10-21 V1.2.1 (2003-09)
ETS 300 392-10-15: "Transfer of control";
ETS 300 392-10-16: "Pre-emptive priority call";
EN 300 392-10-17: "Include Call (IC)";
EN 300 392-10-18: "Barring of Outgoing Calls (BOC)";
EN 300 392-10-19: "Barring of Incoming Calls (BIC)";
ETS 300 392-10-20: "Discreet Listening (DL)";
EN 300 392-10-21: "Ambience Listening (AL)";
EN 300 392-10-22: "Dynamic Group Number Assignment (DGNA)";
ETS 300 392-10-23: "Call completion on no reply";
ETS 300 392-10-24: "Call Retention (CRT)";
EN 300 392-11: "Supplementary services stage 2";
EN 300 392-12: "Supplementary services stage 3";
ETS 300 392-13: "SDL model of the Air Interface (AI)";
ETS 300 392-14: "Protocol Implementation Conformance Statement (PICS) proforma specification";
TS 100 392-15: "TETRA frequency bands, duplex spacings and channel numbering";
TS 100 392-16: "Network Performance Metrics";
TS 100 392-17: "TETRA V+D and DMO Release 1.1 specifications".

National transposition dates
Date of adoption of this EN: 29 August 2003
Date of latest announcement of this EN (doa): 30 November 2003
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 May 2004
Date of withdrawal of any conflicting National Standard (dow): 31 May 2004

ETSI
7 ETSI EN 300 392-10-21 V1.2.1 (2003-09)
1 Scope
The present document defines the stage 1 specifications of the Ambience Listening (AL) supplementary service for the
Trans-European Trunked RAdio (TETRA). 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.
The present document specifies the service description of the supplementary service and the procedures to be expected
with successful and unsuccessful outcomes. In addition the present document specifies the interactions with other
TETRA supplementary services and inter-working considerations.
Charging principles are outside the scope of the present document.
The AL supplementary service enables the served user to place an affected user's TETRA Mobile Station (MS) into a
special type of individual voice call teleservice whereby the called MS shall transmit without any action from, or
indication to, the affected user.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] ITU-T Recommendation Z.100: "Specification and Description Language (SDL)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
affected user: ambience listened-to user
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA
services
NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS).
served user: user who invokes the supplementary service
Switching and Management Infrastructure (SwMI): all
...