SIST ETS 300 392-10-11 E2:2003

• Abstract:

  Analysis of predicted needs for digital trunked systems in Europe; definition of services to be provided; analysis of spectrum req ments; characteristics of relevant interfaces Contains: TETRA 03.60 to 03.85

• 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 ETS 300 392-10-11 ed.2 (2000-02) - Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 11: Call Waiting (CW)

Overview

SIST ETS 300 392-10-11 E2:2003 defines the Call Waiting (CW) supplementary service within the Terrestrial Trunked Radio (TETRA) systems, supporting both voice and data services (V+D). Developed by the Slovenian Institute for Standardization (SIST), this standard aligns with European requirements under the ETSI framework. It details how a TETRA user can effectively manage additional incoming calls when already engaged, enhancing operational efficiency for public safety, transportation, utilities, and industrial communications.

This standard is part of a comprehensive suite governing digital trunked systems in Europe, addressing service provision, interface characteristics, and spectrum needs.

Key Topics

• Call Waiting (CW) Supplementary Service:

  • Allows a called user to acknowledge an incoming individual call even if already busy.
  • The user can accept, reject, or ignore the waiting call based on operational needs.
  • Service applicability spans all circuit mode individual teleservices and bearer services.

• Procedural Control:

  • Activation and deactivation can be managed by both the network provider and, after provisioning, by the user.
  • CW can be provided individually or as a network-wide option.
  • Procedures cover normal operations (activation, invocation, clearing) and exceptions (maximum calls reached, deactivation, no resources, location change).

• User Roles:

  • Served user: the individual able to invoke the CW service.
  • User A: engaged in a current call with the served user.
  • User C: originator of an incoming individual call to the busy user.

• Interaction with Other Supplementary Services:

  • Details on how CW integrates or co-exists with services such as Call Forwarding, Call Hold, Priority Call, and Call Completion.
  • Special case interactions (e.g., precedence of Call Forwarding Unconditional over CW).

• Network and Interface Considerations:

  • Interactions between different TETRA networks are addressed to ensure notifications, service operability, and consistency.
  • Supports flexible location management and mobility scenarios for served users.

Applications

The Call Waiting (CW) feature is critical for organizations requiring robust, mission-critical communications. Its practical applications include:

• Public Safety and Emergency Services: Allows dispatchers and first responders to manage urgent incoming calls during ongoing operations without losing connection.
• Utility and Transport Operators: Enables field workers to remain reachable to higher-priority calls while already engaged in a task, ensuring seamless coordination and safety.
• Industrial and Private Networks: Supports efficient call management in environments where constant communication and immediate responsiveness are vital.

By allowing users to accept, hold, or reject calls while busy, CW enhances efficiency, safety, and resource utilization in digital trunked radio networks.

Related Standards

SIST ETS 300 392-10-11 E2:2003 is part of a broader standardization ecosystem for TETRA systems. Related documents include:

• ETS 300 392-2: Defines the Air Interface for TETRA, essential for understanding signaling and service support.
• ETS 300 392-9: Covers general requirements for supplementary services in TETRA.
• ETS 300 392-10 (Parts 10-13): Address various aspects of supplementary services, including further procedural, protocol, and conformance details.
• CCITT Recommendation I.130: Provides methodology for characterizing telecommunication services.
• ITU-T Recommendation Z.100: Specification and Description Language (SDL), forming a basis for service descriptions and procedures.

These standards collectively enable interoperability, reliable communications, and advanced service features within the TETRA ecosystem, supporting critical European digital trunked systems.

Keywords: TETRA, Call Waiting, supplementary services, digital trunked radio systems, voice and data, public safety communications, standardization, SIST, ETSI.

SLOVENSKI STANDARD
01-december-2003
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VWRULWYHVWRSQMH±SRGGHOýDNDMRþLNOLF&:
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary
services stage 1; Sub-part 11: Call Waiting (CW)
Ta slovenski standard je istoveten z: ETS 300 392-10-11 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 300 392-10-11
TELECOMMUNICATION February 2000
STANDARD Second Edition
Source: TETRA Reference: RE/TETRA-03001-10-11
ICS: 33.020
Key words: Data, radio, speech, stage 1, supplementary service, TETRA
Terrestrial Trunked Radio (TETRA);
VoiceplusData(V+D);
Part 10: Supplementary services stage 1;
Sub-part 11: Call Waiting (CW)
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 2000. All rights reserved.

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ETS 300 392-10-11: February 2000
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.

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ETS 300 392-10-11: February 2000
Contents
Foreword.5
1 Scope .7
2 Normative 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-CW 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.8
4.2.1 Provision/withdrawal.8
4.2.2 Normal procedures.9
4.2.2.1 Activation, deactivation, definition, registration,
interrogation and cancellation.9
4.2.2.1.1 Activation/Deactivation.9
4.2.2.1.2 Definition .9
4.2.2.1.3 Registration.9
4.2.2.1.4 Interrogation.9
4.2.2.1.5 Cancellation .9
4.2.2.2 Invocation.9
4.2.2.3 Operation .9
4.2.3 Exceptional procedures.10
4.2.3.1 Activation, deactivation, definition, registration,
interrogation and cancellation.10
4.2.3.1.1 Activation/Deactivation.10
4.2.3.1.2 Definition .10
4.2.3.1.3 Registration.10
4.2.3.1.4 Interrogation.11
4.2.3.1.5 Cancellation .11
4.2.3.2 Invocation and operation.11
4.2.3.2.1 Invocation.11
4.2.3.2.1.1 Maximum number of waiting calls
reached .11
4.2.3.2.1.2 SS-CW deactivated .11
4.2.3.2.2 Operation .11
4.2.3.2.2.1 Waiting call cleared by the served
user .11
4.2.3.2.2.2 Call cleared by the network.12
4.2.3.2.2.3 No resources available .12
4.2.3.2.2.4 Waiting call ignored by the served
user .12
4.2.3.2.2.5 Waiting call clearing by user C.12
4.2.3.2.2.6 Location change.12
4.3 Interactions with other supplementary services .12
4.3.1 Calling Line Identification Presentation .12
4.3.2 Calling/Connected Line Identification Restriction .12
4.3.3 Connected Line Identification Presentation.12
4.3.4 Call Report.13
4.3.5 Talking Party Identification .13
4.3.6 Call Forwarding Unconditional (SS-CFU).13

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ETS 300 392-10-11: February 2000
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). 14
4.3.10 List Search Call (LSC) . 14
4.3.11 Call Authorized by Dispatcher (CAD). 14
4.3.12 Short Number Addressing (SNA). 14
4.3.13 Area Selection (AS) . 14
4.3.14 Access Priority (AP). 14
4.3.15 Priority Call (PC) . 14
4.3.16 Call Hold (HOLD). 15
4.3.17 Call Completion to Busy Subscriber (CCBS). 15
4.3.18 Late Entry (LE). 15
4.3.19 Transfer of Control (TC) . 15
4.3.20 Pre-emptive Priority Call (PPC) . 15
4.3.21 Include Call (IC) . 16
4.3.22 Advice of Charge (AC). 16
4.3.23 Barring of Outgoing Calls (BOC) . 16
4.3.24 Barring of Incoming Calls (BIC) . 16
4.3.25 Discreet Listening (DL) . 16
4.3.26 Ambience Listening (AL). 16
4.3.27 Dynamic Group Number Assignment (DGNA) . 16
4.3.28 Call Completion on No Reply (CCNR). 16
4.3.29 Call Retention (CRT). 17
4.4 Inter-working considerations . 17
4.4.1 Inter-working between different TETRA networks . 17
4.4.2 Inter-working with external networks . 17
4.5 Overall SDL . 17
History. 21

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ETS 300 392-10-11: February 2000
Foreword
This 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: 14 January 2000
Date of latest announcement of this ETS (doa):
30 April 2000
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 October 2000
Date of withdrawal of any conflicting National Standard (dow): 31 October 2000

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ETS 300 392-10-11: February 2000
1 Scope
This European Telecommunication Standard (ETS) defines the stage 1 description of the call waiting
supplementary service (SS-CW) for the Terrestrial Trunked Radio (TETRA) as provided by European
operators. The stage 1 description is an overall service description from the user point of view but does
not deal with the details of the human interface itself (see CCITT Recommendation I.130 [1]).
SS-CW permits a called user to acknowledge an incoming individual call while he is already busy.
Subsequently that user shall have the choice to accept, reject or ignore that incoming call.
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 inter-working considerations.
Charging principles are outside the scope of this ETS.
2 Normative references
This ETS incorporates by dated and 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] CCITT Recommendation I.130: "Method for the characterization of
telecommunication services supported by an ISDN and network capabilities of
an ISDN".
[2] ITU-T Recommendation Z.100: "CCITT Specification and description language
(SDL)".
[3] ETS 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 2: Air Interface (AI)".
[4] ETS 300 392-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 9: General requirements for supplementary services".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the definitions of ETS 300 392-9 [4] apply, except for that of served user,
which is given below together with other ones which also apply:
served user: user who may invoke the supplementary service (i.e. acknowledge an incoming individual
while he is busy, instead of clearing it).
timer T2: measures the waiting time for the offered call from user C to be either accepted or cleared by
the served user B after SS-CW has been invoked. This timer is a network basic call timer. It corresponds
to the basic call timer T304 on the called user side (see clause 14 of ETS 300 392-2 [3]).
user A: user engaged in an individual call with the served user (this call can be in any state).
NOTE: There is no user A when the call in which the served user is engaged when he
receives an incoming individual call is a group call.
user C: user who has originated an individual call to the served user while that served user is busy
(i.e. the served user may invoke the call waiting supplementary service for the call from user C).

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ETS 300 392-10-11: February 2000
3.2 Abbreviations
3.2.1 General abbreviations
For the purposes of this ETS, the following general abbreviations apply:
ISDN Integrated Services Digital Network
MS Mobile Station
SDL (Functional) Specification and Description Language
SS Supplementary Service
NOTE: The abbreviation SS is only used when referring to a specific supplementary service.
3.2.2 Supplementary service abbreviations
For the purposes of this ETS, the following supplementary service abbreviations apply:
CAD Call Authorized by Dispatcher
CCBS Call Completion to Busy Subscriber
CFB Call Forwarding on Busy
CFNRc Call Forwarding on Not Reachable
CFNRy Call Forwarding on No Reply
CFU Call Forwarding Unconditional
CW Call Waiting
4 SS-CW stage 1 specification
4.1 Description
4.1.1 General description
SS-CW permits a called user to acknowledge an incoming individual call while he is already busy. That
call shall then be qualified as a waiting call. Subsequently that user shall have the choice to accept,
reject or ignore the waiting call.
4.1.2 Qualifications on applicability to telecommunication services
This supplementary service shall be applicable to all circuit mode individual teleservices and bearer
services.
4.2 Procedures
4.2.1 Provision/withdrawal
The provision of SS-CW shall be on a per individual subscriber basis, or as a network option general for
all (TETRA) individual subscribers. The corresponding subscriptions shall be valid for all basic services for
which SS-CW applies (see subclause 4.1.2).
The supplementary service shall be withdrawn by the service provider:
- for administrative purposes; or
- at the request of the served user, if individually provided.
No specific information shall then be given to the subscribers by the network.

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ETS 300 392-10-11: February 2000
4.2.2 Normal procedures
4.2.2.1 Activation, deactivation, definition, registration, interrogation and cancellation
4.2.2.1.1 Activation/Deactivation
The CW supplementary service shall be activated by the service provider upon provision.
The CW supplementary service shall be deactivated by the service provider upon withdrawal.
The served user should also be able to activate/deactivate the service after provision.
4.2.2.1.2 Definition
Not applicable.
4.2.2.1.3 Registration
Not applicable.
4.2.2.1.4 Interrogation
Not applicable.
4.2.2.1.5 Cancellation
Not applicable.
4.2.2.2 Invocation
If SS-CW has been activated for the served user, when a new individual call is addressed to that user
and the network has determined that such user is already engaged in a call (i.e. that user is then in the
busy state whether he participates in an individual call or in a group call), the network shall offer that
call to him unless it has already reached the maximum number of such additional calls.
NOTE 1: In ISDN, the case just addressed (where the network cannot present a new additional
call when the called user is busy) is one of those corresponding to the situation defined
as "Network Determined User Busy" (NDUB).
When the served user is offered such incoming individual call (from user C) while being busy, he shall
be able to invoke SS-CW. He shall do so in sending a positive response to the offered call within the
same predefined period of time as for sending a basic call response.
The same shall apply if the network offers a new incoming individual call to the served user without
knowing that he is in the busy state.
NOTE 2: The served user may be in the busy state without the network knowing it when the
served user participates in a group call.
The served user may be able to invoke SS-CW for more than one incoming individual call. However
the maximum number of waiting calls at any one time per busy subscriber shall be a network option,
and it is recommended that that maximum number be one.
4.2.2.3 Operation
When the called user has invoked SS-CW for a call (incoming individual):
- except for specific applications if the initial values of the basic call timers T304 (see clause 14 of
ETS 300 392-2 [3]) in his terminal equipment and T2 in the network are less than 30 seconds, they
should be set at least to 30 seconds;
- the network shall apply the individual basic call procedure for informing user C that:

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ETS 300 392-10-11: February 2000
- the basic call hook selection is on/hook off signalling;
- the called user has been offered the call.
- in addition the network shall notify user C that SS-CW has been invoked for his call.
If the served user is participating in an individual call, with user A, he should free resources
(i.e. especially air interface resources in the case of a MS) before requesting the network to connect
the waiting call from user C. To do so: either:
- he or user A shall clear the (active) individual call; or
- he shall invoke the call hold individual supplementary service.
If the served user is participating in a group call without being the call owner, according to the group call
procedures, he will be able to immediately leave that call and answer the waiting call without affecting the
ongoing group call. If he is the call owner, it is an implementation matter whether he will be able to
immediately leave the group call to answer the waiting call without first having first either cleared the group
call or transferred its control to another group member - using the supplementary service transfer of
control.
To accept a waiting call (after having freed resources following the above recommendation if the active
call was an individual call), the served user shall use the basic call procedure.
Any previous waiting indication to the served user should then be removed in the served user MS/LS.
If the served user has invoked SS-CW for more than one call, he shall be able to accept any such waiting
call, unless that call has been cleared in the meantime. The network shall connect that call:
if
- the served user has not changed location since he has invoked SS-CW for that call;
or if
- the served user has changed location since he has invoked SS-CW for that call and both his
terminal equipment and the network support the optional SS-CW location change procedure.
NOTE 1: See subclause 4.2.3.2 for the case where the network cannot satisfy the request
because the served user has changed location since he has invoked SS-CW for the
call and the network does not support the SS-CW location change procedure.
NOTE 2: If user C changes location while the call is waiting, the call restoration procedure for
basic call may apply.
4.2.3 Exceptional procedures
4.2.3.1 Activation, deactivation, definition, registration, interrogation and cancellation
4.2.3.1.1 Activation/Deactivation
The served user activation request may fail when SS-CW has not been subscribed for that user.
The network shall then indicate such failure to the served user in giving him the corresponding reason.
4.2.3.1.2 Definition
Not applicable.
4.2.3.1.3 Registration
Not applicable.
SIST ETS 30
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