Building intercom systems - Part 2: Requirements for advanced security building intercom systems

This part of IEC 62820 specifies the technical requirements for the composition, function,
performance and testing methods of Advanced Security Building Intercom Systems.
This document is applicable for intercom systems used for any advanced security
communication in buildings.
Advanced security building intercom systems (ASBIS) are used for rapid emergency and danger
messages verification by voice communication, warning of a danger, rapid notification of the
responsible emergency services/intervention services and for sending instructions on how to
proceed. The requirement for a suitable concept is prior risk assessment and a definition of the
protection target.
A Security management unit (SMU) is a necessary part of an ASBIS.
The type of building and the usage of a building have influence on the risk calculation. In this
document, the relevant functions and performances are divided into three grades. According to
the results of the risk calculation, the security needs will be covered by an individual system
profile.
NOTE 1 Examples of typical profiles and each grades are defined in IEC 62820-3-2, where a risk calculation is
required.
NOTE 2 The application of this document does not dispense to comply with the public national regulations
concerning emergency systems.
NOTE 3 Systems for emergency purposes can be the subject of approval by local authorities.

Gebäude-Sprechanlagen - Teil 2: Anforderungen an Sprechanlagen für Gebäude mit gehobenen Sicherheitsanforderungen (SGGS)

Systèmes d'interphone de bâtiment - Partie 2: Exigences pour les systèmes d'interphone de bâtiment à sécurité avancée (ASBIS)

L'IEC 62820-2:2017 spécifie les exigences techniques relatives à la composition, aux fonctions, aux performances et aux méthodes d'essai des systèmes d'interphone de bâtiment à sécurité avancée. Le présent document s'applique aux systèmes d'interphone utilisés pour la communication à sécurité avancée dans les bâtiments. Les systèmes d'interphone de bâtiment à sécurité avancée (ASBIS) sont utilisés pour la vérification rapide de messages d'urgence et de danger par communication vocale, la mise en garde contre un danger, la notification rapide des services d'urgence/services d'intervention concernés et pour envoyer des instructions sur la conduite à adopter. L'exigence pour un concept adapté consiste en une évaluation préalable du risque et en une définition de la cible de la protection.

Notranja komunikacija v stavbah - 2. del: Zahteve za naprednejše varnostne sisteme notranjih komunikacij v stavbah

Ta del standarda IEC 62820 določa tehnične zahteve za sestavo, funkcije in zmogljivost naprednejših varnostnih sistemov notranjih komunikacij v stavbah ter metode za njihovo preskušanje. Ta dokument se uporablja za sisteme notranjih komunikacij, ki se uporabljajo za naprednejšo varnostno komunikacijo v stavbah.
Naprednejši varnostni sistemi notranjih komunikacij v stavbah (ASBIS) se uporabljajo za hitro preverjanje sporočil v sili in sporočil o nevarnosti na podlagi glasovne komunikacije, opozarjanje na nevarnost, hitro obveščanje odgovornih zasilnih/intervencijskih storitev ter pošiljanje navodil za nadaljnje ukrepanje. Zahteva za ustrezno zasnovo ima prednost pred ocenjevanjem tveganj in opredelitvijo tarče zaščite.
Enota za upravljanje varnosti (SMU) je obvezen del naprednejšega varnostnega sistema notranjih komunikacij v stavbi.
Vrsta stavbe in uporaba stavbe vplivata na izračun tveganja. V tem dokumentu so ustrezne funkcije in zmogljivosti razdeljene v tri razrede. Glede na rezultate izračuna tveganja bo varnostne zahteve izpolnjeval posamezen profil sistema.
OPOMBA 1: Primeri tipičnih profilov in posameznih razredov so opredeljeni v standardu IEC 62820-3-2, ki zahteva izračun tveganja.
OPOMBA 2: Uporaba tega dokumenta ne pomeni, da lahko uporabnik opusti ukrepe za zagotavljanje skladnosti z javnimi nacionalnimi uredbami o sistemih za primere nevarnosti.
OPOMBA 3: Sistemi za primere nevarnosti so lahko predmet odobritve lokalnih organov.

General Information

Status
Published
Publication Date
20-Feb-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Feb-2018
Due Date
19-Apr-2018
Completion Date
21-Feb-2018

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SLOVENSKI STANDARD
SIST EN IEC 62820-2:2018
01-marec-2018
Notranja komunikacija v stavbah - 2. del: Zahteve za naprednejše varnostne
sisteme notranjih komunikacij v stavbah
Building intercom systems - Part 2: Requirements for advanced security building
intercom systems
Ta slovenski standard je istoveten z: EN IEC 62820-2:2018
ICS:
35.240.67 Uporabniške rešitve IT v IT applications in building
gradbeništvu and construction industry
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
SIST EN IEC 62820-2:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62820-2:2018
---------------------- Page: 2 ----------------------
SIST EN IEC 62820-2:2018
EUROPEAN STANDARD EN IEC 62820-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2018
ICS 13.320
English Version
Building intercom systems - Part 2: Requirements for advanced
security building intercom systems (ASBIS)
(IEC 62820-2:2017)

Systèmes d'interphone de bâtiment - Partie 2: Exigences Gebäude-Sprechanlagen - Teil 2: Gebäude-Sprechanlagen

pour les systèmes d'interphone de bâtiment à sécurité für erhöhte Sicherheitsanforderungen

avancée (ASBIS) (IEC 62820-2:2017)
(IEC 62820-2:2017)

This European Standard was approved by CENELEC on 2017-10-20. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62820-2:2018 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62820-2:2018
EN IEC 62820-2:2018
European foreword

The text of document 79/588/FDIS, future edition 1 of IEC 62820-2, prepared by IEC/TC 79 "Alarm

and electronic security systems" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 62820-2:2018.
The following dates are fixed:
(dop) 2018-07-26
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-01-26
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 62820-2:2017 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60839-11 Series NOTE Harmonized as EN 60839-11 Series.
IEC 60950-1 NOTE Harmonized as EN 60950-1.
IEC 62820-3-1 NOTE Harmonized as EN 62820-3-1 .
IEC/ISO 31010 NOTE Harmonized as EN 31010.
Under preparation. Stage at the time of publication: FprEN 62820-3-1:2017.
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SIST EN IEC 62820-2:2018
EN IEC 62820-2:2018
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60268-16 - Sound system equipment - EN 60268-16 -
Part 16: Objective rating of speech
intelligibility by speech transmission index
IEC 60417-DB - Graphical symbols for use on equipment - -
IEC 62820-1-1 - Building intercom systems - EN 62820-1-1 -
Part 1-1: System requirements - General
IEC 62820-1-2 - Building intercom systems - EN 62820-1-2 -
Part 1-2: System requirements - Building
intercom systems using the internet
protocol (IP)
IEC 62820-3-2 - Building intercom systems - EN 62820-3-2 -
Part 3-2: Application guidelines - Advanced
security building intercom systems (ASBIS)
IEC 62676 Series Video surveillance systems for use in EN 62676 Series
security applications
ISO 7010 - Graphical symbols - Safety colours and EN ISO 7010 -
safety signs - Registered safety signs
ITU-T P.79 - Calculation of loudness ratings for - -
telephone sets
Annex G, Telephone transmission quality,
telephone installations, local line networks
ITU-T P.311 - Transmission characteristics for wideband - -
digital handset and headset telephones
ITU-T P.340 - Transmission characteristics and speech - -
quality parameters of hands-free terminals
ITU-T P.341 - Transmission characteristics for wideband - -
digital loudspeaking and hands-free
telephony terminals
ITU-T P.800 - Methods for subjective determination of - -
transmission quality
ITU-T - 7 kHz audio-coding within 64 kbit/s - -
Recommendation
G.722
Under preparation. Stage at the time of publication: FprEN 62820-3-2:2017.
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SIST EN IEC 62820-2:2018
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SIST EN IEC 62820-2:2018
IEC 62820-2
Edition 1.0 2017-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Building intercom systems –
Part 2: Requirements for advanced security building intercom systems (ASBIS)
Systèmes d'interphone de bâtiment –
Partie 2: Exigences pour les systèmes d'interphone de bâtiment à sécurité
avancée (ASBIS)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.320 ISBN 978-2-8322-4731-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 62820-2:2018
– 2 – IEC 62820-2:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms, definitions and abbreviated terms ........................................................................ 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms ................................................................................................. 13

4 Functional requirements ................................................................................................ 14

4.1 General ................................................................................................................. 14

4.2 Call function .......................................................................................................... 14

4.3 Unlocking function ................................................................................................ 14

4.4 Emergency call ..................................................................................................... 14

4.5 Manually controlled half duplex (non-simultaneous conversation) ......................... 15

4.6 High priority call .................................................................................................... 15

4.7 Direct communication between the security management units and

master-stations ..................................................................................................... 15

4.8 Audio and optical indicators .................................................................................. 15

4.9 Help call (call for assistance) ................................................................................ 15

4.10 Call queue ............................................................................................................ 15

4.11 Image transmission ............................................................................................... 15

4.12 Entrance warning message ................................................................................... 15

4.13 Event logs ............................................................................................................. 16

4.14 SMU system test ................................................................................................... 16

4.15 Overall system test ............................................................................................... 16

4.16 Intercom unit full duplex ........................................................................................ 16

4.17 Intercom unit voice switched duplex (automatic half duplex) ................................. 16

4.18 Intercom unit call queue ........................................................................................ 16

4.19 Intercom unit call transfer ..................................................................................... 16

4.20 Intercom unit keep on hold .................................................................................... 17

4.21 Intercom unit privacy protection ............................................................................ 17

4.22 Intercom unit privacy communication .................................................................... 17

4.23 Intercom unit microphone status ........................................................................... 17

4.24 System status monitoring ...................................................................................... 17

4.25 System event monitoring ....................................................................................... 17

4.26 System fault monitoring ........................................................................................ 17

4.27 Network security ................................................................................................... 17

4.28 Service staff and system administrators authentication and authorization ............. 18

4.29 Network authentication and authorisation .............................................................. 18

4.30 System access control .......................................................................................... 18

4.31 Deleted ................................................................................................................. 18

4.32 Interconnection security ........................................................................................ 18

4.33 Integrity protection ................................................................................................ 18

4.34 Building warnings distribution ................................................................................ 18

4.35 Environmental noise cancellation .......................................................................... 18

4.36 Void ...................................................................................................................... 19

4.37 Automatic aggression detection, (scream, shoot, glass-break, etc) ....................... 19

4.38 System redundancy .............................................................................................. 19

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SIST EN IEC 62820-2:2018
IEC 62820-2:2017 © IEC 2017 – 3 –

4.39 Inductive loop ....................................................................................................... 19

4.40 Interfacing............................................................................................................. 19

4.41 User interface ....................................................................................................... 19

4.42 Software download/upgrade .................................................................................. 19

4.43 Void ...................................................................................................................... 20

4.44 System test ........................................................................................................... 20

4.45 Voice communication test ..................................................................................... 20

4.46 Error report ........................................................................................................... 20

4.47 Conversation transfer ............................................................................................ 20

5 Performance requirements............................................................................................. 20

5.1 General ................................................................................................................. 20

5.2 Audio characteristics ............................................................................................. 21

5.2.1 Acoustic pressure level .................................................................................. 21

5.2.2 Frequency response ...................................................................................... 21

5.2.3 Acoustic distortion ......................................................................................... 21

5.2.4 Channel S/N ratio .......................................................................................... 21

5.2.5 Side-tone masking rating (STMR) .................................................................. 21

5.2.6 Codec dependent parameters, receiving delay ............................................... 21

5.2.7 Audio switching time ...................................................................................... 21

5.2.8 Codec dependent parameters, sending delay ................................................ 21

5.2.9 Automatic volume control (AVC) .................................................................... 22

5.2.10 Speech transmission index (STI) ................................................................... 22

5.2.11 Transmission quality ...................................................................................... 22

5.2.12 Codec ............................................................................................................ 22

5.3 Other performances .............................................................................................. 22

5.3.1 System status monitoring ............................................................................... 22

5.3.2 System event monitoring ............................................................................... 22

5.3.3 System fault monitoring ................................................................................. 22

5.3.4 Number of speech channels .......................................................................... 23

5.3.5 Obsolete time ................................................................................................ 23

6 Test methods ................................................................................................................. 23

6.1 General ................................................................................................................. 23

6.2 The measurement of the frequency response ........................................................ 23

6.3 Acoustic pressure level ......................................................................................... 23

6.4 Acoustic distortion ................................................................................................ 23

6.5 Channel S/N ratio ................................................................................................. 23

6.6 Automatic volume control ...................................................................................... 23

6.7 Measurement of STI for laboratory test as well as for an onsite test of an

installed system .................................................................................................... 24

6.8 Other measurements ............................................................................................ 24

Annex A (normative) Pictograms: Symbols for important functions ...................................... 25

A.1 General ................................................................................................................. 25

A.2 Symbol for any call button (Door Bell): IEC 60417-5013:2002-10 .......................... 25

A.3 Symbol for call registration: IEC 60417-5090:2002-10 ........................................... 25

A.4 Symbol for established conversation: IEC 60417-5210:2011-05 ............................ 26

A.5 Symbol for: unlocked door: as ISO 7010 E058 but without arrow ........................... 26

A.6 Symbol for manually or automatically cancelling: IEC 60417-5576:2002-11 .......... 27

Annex B (normative) System composition ........................................................................... 28

Bibliography .......................................................................................................................... 29

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SIST EN IEC 62820-2:2018
– 4 – IEC 62820-2:2017 © IEC 2017

Figure A.1 – Call button symbols .......................................................................................... 25

Figure A.2 – Call registration symbols ................................................................................... 25

Figure A.3 – Established conversation symbols .................................................................... 26

Figure A.4 – Unlocked door symbols ..................................................................................... 26

Figure A.5 – Call Cancel button symbols ............................................................................... 27

Figure B.1 – Composition of an ASBIS .................................................................................. 28

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SIST EN IEC 62820-2:2018
IEC 62820-2:2017 © IEC 2017 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BUILDING INTERCOM SYSTEMS –
Part 2: Requirements for advanced security
building intercom systems (ASBIS)
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in

addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses

arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62820-2 has been prepared by IEC technical committee 79: Alarm

and electronic security systems.
The text of this International Standard is based on the following documents:
FDIS Report on voting
79/588/FDIS 79/590/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.
---------------------- Page: 11 ----------------------
SIST EN IEC 62820-2:2018
– 6 – IEC 62820-2:2017 © IEC 2017

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62820 series, published under the general title Building intercom

systems, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 12 ----------------------
SIST EN IEC 62820-2:2018
IEC 62820-2:2017 © IEC 2017 – 7 –
INTRODUCTION

The IEC 62820 series of standards set out the technical requirements for the composition,

functions, performance, test methods of building intercom systems for building entry and

application guidelines and consist of five parts:
Part 1-1: System requirements – General;

Part 1-2: System requirements – Building intercom systems using the internet protocol (IP);

Part 2: Requirements for advanced security building intercom systems (ASBIS);
Part 3-1 : Application guidelines – General;
Part 3-2 : Application guidelines – Advanced security building intercom systems.

IEC 62820-2 specifies higher security requirements, to be used in buildings with advanced

security needs that additionally or alternatively apply in respect of those in IEC 62820-1-1 and/or

IEC 62820-1-2 which give basic requirements for building intercom systems.

Additional requirements and recommendations are those described in IEC 62820-2, but they

are not covered by IEC 62820-1-1 neither IEC 62820-1-2.

Requirements and recommendations described by IEC 62820-2 have precedence, if also

described in IEC 62820-1-1 and/or IEC 62820-1-2.
___________
Under preparation. Stage at the time of publication: IEC/AFDIS 62820-3-1:2017.
Under preparation. Stage at the time of publication: IEC/AFDIS 62820-3-2:2017.
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SIST EN IEC 62820-2:2018
– 8 – IEC 62820-2:2017 © IEC 2017
BUILDING INTERCOM SYSTEMS –
Part 2: Requirements for advanced security
building intercom systems (ASBIS)
1 Scope

This part of IEC 62820 specifies the technical requirements for the composition, function,

performance and testing methods of Advanced Security Building Intercom Systems.
This document is applicable for intercom systems used for any advanced security
communication in buildings.

Advanced security building intercom systems (ASBIS) are used for rapid emergency and danger

messages verification by voice communication, warning of a danger, rapid notification of the

responsible emergency services/intervention services and for sending instructions on how to

proceed. The requirement for a suitable concept is prior risk assessment and a definition of the

protection target.
A Security management unit (SMU) is a necessary part of an ASBIS.

The type of building and the usage of a building have influence on the risk calculation. In this

document, the relevant functions and performances are divided into three grades. According to

the results of the risk calculation, the security needs will be covered by an individual system

profile.

NOTE 1 Examples of typical profiles and each grades are defined in IEC 62820-3-2, where a risk calculation is

required.

NOTE 2 The application of this document does not dispense to comply with the public national regulations

concerning emergency systems.

NOTE 3 Systems for emergency purposes can be the subject of approval by local authorities.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 60268-16, Sound system equipment – Part 16: Objective rating of speech intelligibility by

speech transmission index
IEC 60417, Graphical symbols for use on equipment (available at
http://www.graphical-symbols.info/equipment)

IEC 62820-1-1, Building intercom systems – Part 1-1: System requirements – General

IEC 62820-1-2, Building intercom systems – Part 1-2: System requirements – Building intercom

systems using the internet protocol (IP)

IEC 62820-3-2, Building intercom systems – Part 3-2: Application guidelines – Advanced

security building intercom systems
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SIST EN IEC 62820-2:2018
IEC 62820-2:2017 © IEC 2017 – 9 –

IEC 62676 (all parts), Video surveillance systems for use in security applications

ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs

ITU-T G.722, 7 kHz audio-coding within 64 kbit/s

ITU-T P.79, Annex G, Telephone transmission quality, telephone installations, local line

networks

ITU-T P.311, Transmission characteristics for wideband digital handset and headset telephones

ITU-T P.340, Transmission characteristics and speech quality parameters of hands-free

terminals
ITU-T P.341, Transmission characteristics
...

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