Speech and multimedia Transmission Quality (STQ) - Transmission Requirements for IP-based Narrowband and Wideband Home and Network Media Gateways from a QoS Perspective as Perceived by the User

The present document provides speech transmission performance requirements for narrowband and wideband media
gateways from a QoS perspective as perceived by the user. Media gateways can be network or home based, they may
include a transcoding function. The present document covers the following types of IP-based media gateways:
• ATA (Analogue Terminal Adapter), home gateway IP to POTS
• ITA (ISDN Terminal Adapter), home gateway IP to ISDN
• IAD (Integrated Access device), home router including ATA or ITA
• Network based ATA and ITA
• Carrier grade media gateway, network gateway IP to TDM
• IP-to-IP media gateway, network gateway with transcoding and/or other media processing
• New Generation DECT Fixed part with IP interface (only parameters not covered by New Generation DECT)
Interfaces of media gateways used together with terminals as a system (i.e. connected via Ethernet or with a proprietary
interface) are excluded in the present document and should be measured according to the relevant terminal standard.
If a media gateway includes more than one interface type (e.g. POTS and ISDN), each interface has to be dealt with
differently.
The requirements available in the present document will ensure a high compatibility with IP-and TDM-based fixed and
wireless terminals and networks, including DECT and mobile terminals.
It is the aim to optimize interoperability, the listening and talking quality and the conversational performance. Related
requirements and test methods are defined in the present document.
The present document does not apply to media gateways with 4-wire analogue interfaces.
The requirements for MGWs with respect to voiceband data (VBD) are out of scope in the present document. These
requirements are covered in ETSI TS 102 929 [i.5].

Kakovost prenosa govora in večpredstavnih vsebin (STQ) - Prenosne zahteve za ozkopasovne in širokopasovne domače prehode in medijske prehode po protokolu IP glede na kakovost storitev (QoS), kot jih dojema uporabnik

Ta dokument podaja zahteve za zmogljivost prenosa govora za ozkopasovne in širokopasovne domače prehode glede na kakovost storitev (QoS), kot jih dojema uporabnik. Medijski prehodi so lahko omrežni ali domači in lahko vsebujejo funkcijo za prekodiranje. Ta dokument obravnava naslednje tipe medijskih prehodov po protokolu IP:
• ATA (analogni telefonski vmesnik), domači prehod IP v POTS
• ITA (ISDN telefonski vmesnik), domači prehod IP v ISDN
• IAD (naprava z integriranim dostopom), domači preusmerjevalnik, vključno z ATA ali ITA
• Omrežni ATA in ITA
• Medijski prehod ponudnika, omrežni prehod IP v TDM
• Medijski prehod IP-v-IP, omrežni prehod s prekodiranjem in/ali druge obdelave medijev
• Nova generacija fiksnih delov DECT z vmesnikom IP (le parametri, ki jih ne obsega DECT nove generacije) – vmesniki medijskih prehodov, ki se uporabljajo s terminali kot sistem (tj. povezava prek etherneta ali lastnega vmesnika), so izključeni iz trenutnega dokumenta in naj bi se jih merilo v skladu z ustreznim standardom za terminal.
Če medijski prehod vključuje več kot en vmesnik (npr. POTS in ISDN), je vsak vmesnik treba obravnavati drugače.
Zahteve, na voljo v tem dokumentu, zagotavljajo visoko združljivost s fiksnimi in brezžičnimi terminali in omrežji po protokolu IP in TDM, vključno z DECT in mobilnimi terminali.
Cilj je optimizirati interoperabilnost, kakovost poslušanja in govora ter zmogljivost pogovora. V tem dokumentu so definirane ustrezne zahteve in preskusne metode.
Ta dokument ne velja za medijske prehode s 4-žičnimi analognimi vmesniki.
Zahteve za prehode MGW ob upoštevanju podatkov govornega pasu (VBD) so zunaj obsega tega dokumenta. Te zahteve so zajete v standardu ETSI TS 102 929 [i.5].

General Information

Status
Published
Publication Date
25-Mar-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Mar-2018
Due Date
24-May-2018
Completion Date
26-Mar-2018

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ETSI ES 202 718 V1.3.1 (2017-09)
ETSI STANDARD
Speech and multimedia Transmission Quality (STQ);
Transmission Requirements for IP-based Narrowband and
Wideband Home and Network Media Gateways from
a QoS Perspective as Perceived by the User
---------------------- Page: 1 ----------------------
2 ETSI ES 202 718 V1.3.1 (2017-09)
Reference
RES/STQ-252
Keywords
QoS, speech
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search

The present document may be made available in electronic versions and/or in print. The content of any electronic and/or

print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any

existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the

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Users of the present document should be aware that the document may be subject to revision or change of status.

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No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying

and microfilm except as authorized by written permission of ETSI.

The content of the PDF version shall not be modified without the written authorization of ETSI.

The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2017.
All rights reserved.
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DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP and LTE™ are trademarks of ETSI registered for the benefit of its Members and

of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members.

GSM® and the GSM logo are trademarks registered and owned by the GSM Association.

ETSI
---------------------- Page: 2 ----------------------
3 ETSI ES 202 718 V1.3.1 (2017-09)
Contents

Intellectual Property Rights ................................................................................................................................ 5

Foreword ............................................................................................................................................................. 5

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 8

3 Definitions and abbreviations ................................................................................................................... 8

3.1 Definitions .......................................................................................................................................................... 8

3.2 Abbreviations ..................................................................................................................................................... 9

4 General considerations ........................................................................................................................... 10

4.1 Default Coding Algorithm ................................................................................................................................ 10

4.2 End-to-end considerations ................................................................................................................................ 10

4.3 Parameters to be investigated ........................................................................................................................... 11

4.3.1 Applicability of parameters to different MGWs ......................................................................................... 11

5 Test equipment ....................................................................................................................................... 12

5.1 IP half channel measurement adaptor ............................................................................................................... 12

5.2 Environmental conditions for tests ................................................................................................................... 12

5.3 Accuracy of measurements and test signal generation ..................................................................................... 13

5.4 Network impairment simulation ....................................................................................................................... 13

6 Requirements and associated Measurement Methodologies .................................................................. 14

6.0 General ............................................................................................................................................................. 14

6.1 Test setup.......................................................................................................................................................... 14

6.1.0 General ........................................................................................................................................................ 14

6.1.1 Setup for Media Gateways with 4-wire interface ....................................................................................... 15

6.1.2 Setup for Media Gateways with 2-wire interface ....................................................................................... 15

6.1.3 Setup for Media Gateways with Wireless Access ....................................................................................... 16

6.1.4 Setup for IP-to-IP Media Gateways ............................................................................................................ 17

6.1.5 Test Signal Levels ....................................................................................................................................... 17

6.1.6 Background noise simulation ...................................................................................................................... 17

6.1.7 Echo paths ................................................................................................................................................... 18

6.2 Coding independent parameters ....................................................................................................................... 19

6.2.1 Send Frequency response ............................................................................................................................ 19

6.2.2 Circuit Loudness Rating in Send ................................................................................................................ 20

6.2.3 Linearity Range for CLR (SND) ................................................................................................................. 20

6.2.4 Send Distortion ........................................................................................................................................... 22

6.2.5 Spurious Out-of-Band Signals in Send direction ........................................................................................ 22

6.2.6 Send Noise .................................................................................................................................................. 23

6.2.7 Receive Frequency Response ..................................................................................................................... 23

6.2.8 Circuit Loudness Rating in Receive ........................................................................................................... 24

6.2.9 Linearity Range for CLR (RCV) ................................................................................................................ 25

6.2.10 Receive Distortion ...................................................................................................................................... 26

6.2.11 Out-of-Band Signals Wideband to Narrowband Transcoding .................................................................... 27

6.2.12 Spurious Out-of-band Signals Narrowband to Wideband Transcoding ...................................................... 27

6.2.13 Minimum Activation Level and Sensitivity in Receive Direction .............................................................. 28

6.2.14 Receive Noise ............................................................................................................................................. 28

6.2.15 Double Talk Performance ........................................................................................................................... 29

6.2.15.0 General .................................................................................................................................................. 29

6.2.15.1 Attenuation Range in Send Direction during Double Talk A ......................................................... 29

H,S,dt

6.2.15.2 Attenuation Range in Receive Direction during Double Talk A .................................................... 30

H,R,dt

6.2.15.3 Detection of Echo Components during Double Talk ............................................................................ 31

ETSI
---------------------- Page: 3 ----------------------
4 ETSI ES 202 718 V1.3.1 (2017-09)

6.2.15.4 Minimum Activation Level and Sensitivity of Double Talk Detection ................................................ 33

6.2.16 Switching Characteristics ........................................................................................................................... 33

6.2.16.0 General .................................................................................................................................................. 33

6.2.16.1 Activation in Send Direction ................................................................................................................. 34

6.2.16.2 Activation in Receive Direction ............................................................................................................ 34

6.2.16.3 Silence Suppression and Comfort Noise Generation ............................................................................ 35

6.2.17 Background Noise Performance ................................................................................................................. 35

6.2.17.0 General .................................................................................................................................................. 35

6.2.17.1 Performance in Send Direction in the Presence of Background Noise ................................................. 35

6.2.17.2 Quality of Speech with Background Noise ........................................................................................... 36

6.2.17.3 Quality of Background Noise Transmission (with Far End Speech) .................................................... 37

6.2.17.4 Quality of Background Noise Transmission (with Near End Speech) .................................................. 38

6.2.18 Quality of Echo Cancellation ...................................................................................................................... 38

6.2.18.0 General .................................................................................................................................................. 38

6.2.18.1 Echo Performance According to Recommendation ITU-T G.168 ........................................................ 38

6.2.18.2 Terminal Coupling Loss (TCLw, NB) .................................................................................................. 39

6.2.18.3 Terminal Coupling Loss (TCL, WB) .................................................................................................... 39

6.2.18.4 Temporal Echo Effects .......................................................................................................................... 40

6.2.18.5 Spectral Echo Attenuation ..................................................................................................................... 41

6.2.18.6 Occurrence of Artefacts ........................................................................................................................ 41

6.2.18.7 Variable Echo Paths .............................................................................................................................. 41

6.2.19 Variant Impairments; Network dependant .................................................................................................. 42

6.2.19.1 Clock Accuracy Send ............................................................................................................................ 42

6.2.19.2 Clock Accuracy Receive ....................................................................................................................... 42

6.2.19.3 Send Packet Delay Variation................................................................................................................. 42

6.2.20 Immunity to DTMF False Detection in Send Direction .............................................................................. 43

6.2.21 Send and receive delay - round trip delay ................................................................................................... 43

6.3 Codec Specific Requirements........................................................................................................................... 44

6.3.1 Objective Listening Speech Quality MOS-LQO in Send direction ............................................................ 44

6.3.2 Objective Listening Quality MOS-LQO in Receive direction .................................................................... 45

6.3.3 Quality of Jitter buffer adjustment .............................................................................................................. 48

Annex A (informative): Impulse Response of a Narrowband and Wideband DECT PP ................ 50

Annex B (normative): Test signal for immunity to DTMF false detection in send direction ........ 52

Annex C (informative): Example IP Delay variation .......................................................................... 53

Annex D (informative): Bibliography ................................................................................................... 54

History .............................................................................................................................................................. 55

ETSI
---------------------- Page: 4 ----------------------
5 ETSI ES 202 718 V1.3.1 (2017-09)
Intellectual Property Rights
Essential patents

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 (https://ipr.etsi.org/).

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.
Trademarks

The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.

ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no

right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does

not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.

Foreword

This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission

Quality (STQ).
Modal verbs terminology

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and

"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of

provisions).

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

Introduction

Traditionally, the analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the

fast growth of IP networks, packet-switched networks (VoIP) interfacing PSTN networks and mobile networks, as well

as different types of IP-terminals, are being rapidly introduced. Different types of gateways are used to interconnect to

such IP networks. Since the IP networks will be in many cases interworking with the traditional PSTN and private

networks, many of the basic transmission requirements have to be harmonized between these different types of network

from an end-to-end perspective, including specifications for the edge points.

The present document covers IP-based narrowband and wideband home and network media gateways. It aims to

enhance the interoperability and end-to-end quality.

In contrast to other standards which define minimum performance requirements, it is the intention of the present

document to specify gateway equipment requirements which enable manufacturers and service providers to enable

end-to-end speech performance as perceived by the user. These requirements are absolutely necessary to ensure a good

quality, but they are not sufficient. They have to be combined with requirements (and associated relevant measurement

methods) for other elements in the transmission chain (core IP network, PSTN, terminals), as well as for the whole

mouth-to-ear transmission path.
ETSI
---------------------- Page: 5 ----------------------
6 ETSI ES 202 718 V1.3.1 (2017-09)
1 Scope

The present document provides speech transmission performance requirements for narrowband and wideband media

gateways from a QoS perspective as perceived by the user. Media gateways can be network or home based, they may

include a transcoding function. The present document covers the following types of IP-based media gateways:

• ATA (Analogue Terminal Adapter), home gateway IP to POTS
• ITA (ISDN Terminal Adapter), home gateway IP to ISDN
• IAD (Integrated Access device), home router including ATA or ITA
• Network based ATA and ITA
• Carrier grade media gateway, network gateway IP to TDM

• IP-to-IP media gateway, network gateway with transcoding and/or other media processing

• New Generation DECT Fixed part with IP interface (only parameters not covered by New Generation DECT)

Interfaces of media gateways used together with terminals as a system (i.e. connected via Ethernet or with a proprietary

interface) are excluded in the present document and should be measured according to the relevant terminal standard.

If a media gateway includes more than one interface type (e.g. POTS and ISDN), each interface has to be dealt with

differently.

The requirements available in the present document will ensure a high compatibility with IP-and TDM-based fixed and

wireless terminals and networks, including DECT and mobile terminals.

It is the aim to optimize interoperability, the listening and talking quality and the conversational performance. Related

requirements and test methods are defined in the present document.

The present document does not apply to media gateways with 4-wire analogue interfaces.

The requirements for MGWs with respect to voiceband data (VBD) are out of scope in the present document. These

requirements are covered in ETSI TS 102 929 [i.5].
2 References
2.1 Normative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

https://docbox.etsi.org/Reference/.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are necessary for the application of the present document.

[1] ETSI EN 300 726: "Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full

Rate (EFR) speech transcoding (GSM 06.60)".

[2] ETSI TS 126 171 (V6.0.0): "Digital cellular telecommunications system (Phase 2+); Universal

Mobile Telecommunications System (UMTS); AMR speech codec, wideband; General description

(3GPP TS 26.171 version 6.0.0 Release 6)".
ETSI
---------------------- Page: 6 ----------------------
7 ETSI ES 202 718 V1.3.1 (2017-09)

[3] Recommendation ITU-T G.107: "The E-model, a computational model for use in transmission

planning".

[4] Recommendation ITU-T G.108, including amendments 1 and 2: "Application of the E-model:

A planning guide".

[5] Recommendation ITU-T G.109: "Definition of categories of speech transmission quality".

[6] Recommendation ITU-T G.100.1: "The use of the decibel and of relative levels in speechband

telecommunications".

[7] Recommendation ITU-T G.111: "Loudness Ratings (LRs) in an international connection".

[8] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in

international connections".

[9] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".

[10] Recommendation ITU-T G.723.1: "Dual rate speech coder for multimedia communications

transmitting at 5.3 and 6.3 kbit/s".

[11] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code

Modulation (ADPCM)".

[12] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-

code-excited linear prediction (CS-ACELP)".

[13] Recommendation ITU-T G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s

scalable wideband coder bitstream interoperable with G.729".
[14] Void.

[15] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".

[16] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of

hands-free terminals".
[17] Recommendation ITU-T P.501: "Test signals for use in telephonometry".

[18] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using

complex test signals".
[19] Recommendation ITU-T P.56: "Objective measurement of active speech level".

[20] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters. -

Part 1: Specification".
[21] Recommendation ITU-T P.800.1: "Mean Opinion Score (MOS) terminology".

[22] ETSI TS 102 971: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics of a 2-wire analogue interface

for short line interface".

[23] ETSI ES 201 970: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented

Network Termination Point (NTP)".
[24] Recommendation ITU-T G.168: "Digital network echo cancellers".

[25] Recommendation ITU-T P.863: "Perceptual objective listening quality assessment".

[26] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".

[27] Recommendation ITU-T G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free

operation in systems with low frame loss".
ETSI
---------------------- Page: 7 ----------------------
8 ETSI ES 202 718 V1.3.1 (2017-09)

[28] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive

Multi-Rate Wideband (AMR-WB)".

[29] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals

and gateways".
[30] IETF RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".

[31] ETSI EG 202 396-3: "Speech and multimedia Transmission Quality (STQ); Speech Quality

performance in the presence of background noise Part 3: Background noise transmission -

Objective test methods".
2.2 Informative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are not necessary for the application of the present document but they assist the

user with regard to a particular subject area.

[i.1] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

implementation of VoIP reference point".

[i.2] IETF RFC 2833: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".

[i.3] IETF RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals".

[i.4] Void.

[i.5] ETSI TS 102 929: "Speech and multimedia Transmission Quality (STQ); Procedures for the

identification and selection of common modes of de-jitter buffers and echo cancellers".

[i.6] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field

reproduction method for terminal testing including a background noise database".
3 Definitions and abbreviations
3.1 Definitions

For the purposes of the present document, the following terms and definitions apply:

0dBr point: reference point always located at the digital side of the gateway, for IP-IP gateways located at the input of

the MGW under test
NOTE: See Recommendation ITU-T G.100.1 [6].

2-wire interface: in the context of the present document, telephony analogue interface over 2-wires used in the local

loop

4-wire interface: in the context of the present document, 4-wire digital interface with separate channels for both

directions, irrespective of the physical transmission technology

codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions

of transmission in the same equipment

Composite Source Signal (CSS): signal composed in time by various signal elements

MGW with 2-wire interface: MGW with an analogue 2-wire interface (ATA)
ETSI
---------------------- Page: 8 ----------------------
9 ETSI ES 202 718 V1.3.1 (2017-09)
MGW with 4-wire interface: MGW with only 4-wire interfaces
EXAMPLE: ITA, IP-to-IP and wireless access points.

receive direction: direction from packet switched interfaces towards a synchronous interface (e.g. ISDN, analogue) or

between two packet switched interfaces (for media gateways with packet switched transport on only one side)

NOTE: For media gateways with packet switched transport on both sides (IP-to-IP-MGW), the requirements of

the receive direction have to be applied in both directions.

receive interface: interface in the measurement setup, where a receive signal is injected and/or a send signal is

measured

send direction: direction from a synchronous interface (e.g. ISDN, analogue) towards a packet switched interface (for

media gateways with packet switched interface on only one side)

NOTE: For media gateways with packet switched interfaces on both sides the requirements of the send direction

are not relevant.

send interface: interface in the measurement setup, where a send signal is injected and/or a receive signal is measured

wireless home MGW: home MGW with wireless interface to the phone
EXAMPLE: Wifi or DECT.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AM-FM Amplitude Modulation - Frequency Modulation
AMR Adaptive Multi Rate codec
ATA Analogue Terminal Adapter
CLR Circuit Loudness Rating
CS Composite Source
CSS Composite Source Signal
DECT Digital Enhanced Cordless Telecommunications
DSL Digital Subscriber Line
DSLAM Digital Subscriber Line Access Multiplexer
DTMF Dual Tone Multi Frequency
EC Echo Canceller
EFR Enhance F
...

Final draft ETSI ES 202 718 V1.3.1 (2017-07)
ETSI STANDARD
Speech and multimedia Transmission Quality (STQ);
Transmission Requirements for IP-based Narrowband and
Wideband Home and Network Media Gateways from
a QoS Perspective as Perceived by the User
---------------------- Page: 1 ----------------------
2 Final draft ETSI ES 202 718 V1.3.1 (2017-07)
Reference
RES/STQ-252
Keywords
QoS, speech
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search

The present document may be made available in electronic versions and/or in print. The content of any electronic and/or

print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any

existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the

print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.

Users of the present document should be aware that the document may be subject to revision or change of status.

Information on the current status of this and other ETSI documents is available at

https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx

If you find errors in the present document, please send your comment to one of the following services:

https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification

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3 Final draft ETSI ES 202 718 V1.3.1 (2017-07)
Contents

Intellectual Property Rights ................................................................................................................................ 5

Foreword ............................................................................................................................................................. 5

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 8

3 Definitions and abbreviations ................................................................................................................... 8

3.1 Definitions .......................................................................................................................................................... 8

3.2 Abbreviations ..................................................................................................................................................... 9

4 General considerations ........................................................................................................................... 10

4.1 Default Coding Algorithm ................................................................................................................................ 10

4.2 End-to-end considerations ................................................................................................................................ 10

4.3 Parameters to be investigated ........................................................................................................................... 11

4.3.1 Applicability of parameters to different MGWs ......................................................................................... 11

5 Test equipment ....................................................................................................................................... 12

5.1 IP half channel measurement adaptor ............................................................................................................... 12

5.2 Environmental conditions for tests ................................................................................................................... 12

5.3 Accuracy of measurements and test signal generation ..................................................................................... 13

5.4 Network impairment simulation ....................................................................................................................... 13

6 Requirements and associated Measurement Methodologies .................................................................. 14

6.0 General ............................................................................................................................................................. 14

6.1 Test setup.......................................................................................................................................................... 14

6.1.0 General ........................................................................................................................................................ 14

6.1.1 Setup for Media Gateways with 4-wire interface ....................................................................................... 15

6.1.2 Setup for Media Gateways with 2-wire interface ....................................................................................... 15

6.1.3 Setup for Media Gateways with Wireless Access ....................................................................................... 16

6.1.4 Setup for IP-to-IP Media Gateways ............................................................................................................ 17

6.1.5 Test Signal Levels ....................................................................................................................................... 17

6.1.6 Background noise simulation ...................................................................................................................... 17

6.1.7 Echo paths ................................................................................................................................................... 18

6.2 Coding independent parameters ....................................................................................................................... 19

6.2.1 Send Frequency response ............................................................................................................................ 19

6.2.2 Circuit Loudness Rating in Send ................................................................................................................ 20

6.2.3 Linearity Range for CLR (SND) ................................................................................................................. 20

6.2.4 Send Distortion ........................................................................................................................................... 22

6.2.5 Spurious Out-of-Band Signals in Send direction ........................................................................................ 22

6.2.6 Send Noise .................................................................................................................................................. 23

6.2.7 Receive Frequency Response ..................................................................................................................... 23

6.2.8 Circuit Loudness Rating in Receive ........................................................................................................... 24

6.2.9 Linearity Range for CLR (RCV) ................................................................................................................ 25

6.2.10 Receive Distortion ...................................................................................................................................... 26

6.2.11 Out-of-Band Signals Wideband to Narrowband Transcoding .................................................................... 27

6.2.12 Spurious Out-of-band Signals Narrowband to Wideband Transcoding ...................................................... 27

6.2.13 Minimum Activation Level and Sensitivity in Receive Direction .............................................................. 28

6.2.14 Receive Noise ............................................................................................................................................. 28

6.2.15 Double Talk Performance ........................................................................................................................... 29

6.2.15.0 General .................................................................................................................................................. 29

6.2.15.1 Attenuation Range in Send Direction during Double Talk A ......................................................... 29

H,S,dt

6.2.15.2 Attenuation Range in Receive Direction during Double Talk A .................................................... 30

H,R,dt

6.2.15.3 Detection of Echo Components during Double Talk ............................................................................ 31

ETSI
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4 Final draft ETSI ES 202 718 V1.3.1 (2017-07)

6.2.15.4 Minimum Activation Level and Sensitivity of Double Talk Detection ................................................ 33

6.2.16 Switching Characteristics ........................................................................................................................... 33

6.2.16.0 General .................................................................................................................................................. 33

6.2.16.1 Activation in Send Direction ................................................................................................................. 34

6.2.16.2 Activation in Receive Direction ............................................................................................................ 34

6.2.16.3 Silence Suppression and Comfort Noise Generation ............................................................................ 35

6.2.17 Background Noise Performance ................................................................................................................. 35

6.2.17.0 General .................................................................................................................................................. 35

6.2.17.1 Performance in Send Direction in the Presence of Background Noise ................................................. 35

6.2.17.2 Quality of Speech with Background Noise ........................................................................................... 36

6.2.17.3 Quality of Background Noise Transmission (with Far End Speech) .................................................... 37

6.2.17.4 Quality of Background Noise Transmission (with Near End Speech) .................................................. 38

6.2.18 Quality of Echo Cancellation ...................................................................................................................... 38

6.2.18.0 General .................................................................................................................................................. 38

6.2.18.1 Echo Performance According to Recommendation ITU-T G.168 ........................................................ 38

6.2.18.2 Terminal Coupling Loss (TCLw, NB) .................................................................................................. 39

6.2.18.3 Terminal Coupling Loss (TCL, WB) .................................................................................................... 39

6.2.18.4 Temporal Echo Effects .......................................................................................................................... 40

6.2.18.5 Spectral Echo Attenuation ..................................................................................................................... 41

6.2.18.6 Occurrence of Artefacts ........................................................................................................................ 41

6.2.18.7 Variable Echo Paths .............................................................................................................................. 41

6.2.19 Variant Impairments; Network dependant .................................................................................................. 42

6.2.19.1 Clock Accuracy Send ............................................................................................................................ 42

6.2.19.2 Clock Accuracy Receive ....................................................................................................................... 42

6.2.19.3 Send Packet Delay Variation................................................................................................................. 42

6.2.20 Immunity to DTMF False Detection in Send Direction .............................................................................. 43

6.2.21 Send and receive delay - round trip delay ................................................................................................... 43

6.3 Codec Specific Requirements........................................................................................................................... 44

6.3.1 Objective Listening Speech Quality MOS-LQO in Send direction ............................................................ 44

6.3.2 Objective Listening Quality MOS-LQO in Receive direction .................................................................... 45

6.3.3 Quality of Jitter buffer adjustment .............................................................................................................. 48

Annex A (informative): Impulse Response of a Narrowband and Wideband DECT PP ................ 50

Annex B (normative): Test signal for immunity to DTMF false detection in send direction ........ 52

Annex C (informative): Example IP Delay variation .......................................................................... 53

Annex D (informative): Bibliography ................................................................................................... 54

History .............................................................................................................................................................. 55

ETSI
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5 Final draft ETSI ES 202 718 V1.3.1 (2017-07)
Intellectual Property Rights
Essential patents

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 (https://ipr.etsi.org/).

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.
Trademarks

The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.

ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no

right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does

not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.

Foreword

This final draft ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia

Transmission Quality (STQ), and is now submitted for the ETSI standards Membership Approval Procedure.

Modal verbs terminology

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and

"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of

provisions).

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

Introduction

Traditionally, the analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the

fast growth of IP networks, packet-switched networks (VoIP) interfacing PSTN networks and mobile networks, as well

as different types of IP-terminals, are being rapidly introduced. Different types of gateways are used to interconnect to

such IP networks. Since the IP networks will be in many cases interworking with the traditional PSTN and private

networks, many of the basic transmission requirements have to be harmonized between these different types of network

from an end-to-end perspective, including specifications for the edge points.

The present document covers IP-based narrowband and wideband home and network media gateways. It aims to

enhance the interoperability and end-to-end quality.

In contrast to other standards which define minimum performance requirements, it is the intention of the present

document to specify gateway equipment requirements which enable manufacturers and service providers to enable

end-to-end speech performance as perceived by the user. These requirements are absolutely necessary to ensure a good

quality, but they are not sufficient. They have to be combined with requirements (and associated relevant measurement

methods) for other elements in the transmission chain (core IP network, PSTN, terminals), as well as for the whole

mouth-to-ear transmission path.
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6 Final draft ETSI ES 202 718 V1.3.1 (2017-07)
1 Scope

The present document provides speech transmission performance requirements for narrowband and wideband media

gateways from a QoS perspective as perceived by the user. Media gateways can be network or home based, they may

include a transcoding function. The present document covers the following types of IP-based media gateways:

• ATA (Analogue Terminal Adapter), home gateway IP to POTS
• ITA (ISDN Terminal Adapter), home gateway IP to ISDN
• IAD (Integrated Access device), home router including ATA or ITA
• Network based ATA and ITA
• Carrier grade media gateway, network gateway IP to TDM

• IP-to-IP media gateway, network gateway with transcoding and/or other media processing

• New Generation DECT Fixed part with IP interface (only parameters not covered by New Generation DECT)

Interfaces of media gateways used together with terminals as a system (i.e. connected via Ethernet or with a proprietary

interface) are excluded in the present document and should be measured according to the relevant terminal standard.

If a media gateway includes more than one interface type (e.g. POTS and ISDN), each interface has to be dealt with

differently.

The requirements available in the present document will ensure a high compatibility with IP-and TDM-based fixed and

wireless terminals and networks, including DECT and mobile terminals.

It is the aim to optimize interoperability, the listening and talking quality and the conversational performance. Related

requirements and test methods are defined in the present document.

The present document does not apply to media gateways with 4-wire analogue interfaces.

The requirements for MGWs with respect to voiceband data (VBD) are out of scope in the present document. These

requirements are covered in ETSI TS 102 929 [i.5].
2 References
2.1 Normative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

https://docbox.etsi.org/Reference/.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are necessary for the application of the present document.

[1] ETSI EN 300 726: "Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full

Rate (EFR) speech transcoding (GSM 06.60)".

[2] ETSI TS 126 171: "Digital cellular telecommunications system (Phase 2+); Universal Mobile

Telecommunications System (UMTS); AMR speech codec, wideband; General description (3GPP

TS 26.171 version 6.0.0 Release 6)".
ETSI
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7 Final draft ETSI ES 202 718 V1.3.1 (2017-07)

[3] Recommendation ITU-T G.107: "The E-model, a computational model for use in transmission

planning".

[4] Recommendation ITU-T G.108, including amendments 1 and 2: "Application of the E-model: A

planning guide".

[5] Recommendation ITU-T G.109: "Definition of categories of speech transmission quality".

[6] Recommendation ITU-T G.100.1: "The use of the decibel and of relative levels in speechband

telecommunications".

[7] Recommendation ITU-T G.111: "Loudness Ratings (LRs) in an international connection".

[8] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in

international connections".

[9] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".

[10] Recommendation ITU-T G.723.1: "Dual rate speech coder for multimedia communications

transmitting at 5.3 and 6.3 kbit/s".

[11] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code

Modulation (ADPCM)".

[12] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-

code-excited linear prediction (CS-ACELP)".

[13] Recommendation ITU-T G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s

scalable wideband coder bitstream interoperable with G.729".
[14] Void

[15] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".

[16] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of

hands-free terminals".
[17] Recommendation ITU-T P.501: "Test signals for use in telephonometry".

[18] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using

complex test signals".
[19] Recommendation ITU-T P.56: "Objective measurement of active speech level".

[20] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters. -

Part 1: Specification".
[21] Recommendation ITU-T P.800.1: "Mean Opinion Score (MOS) terminology".

[22] ETSI TS 102 971: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics of a 2-wire analogue interface

for short line interface".

[23] ETSI ES 201 970: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented

Network Termination Point (NTP)".
[24] Recommendation ITU-T G.168: "Digital network echo cancellers".

[25] Recommendation ITU-T P.863: "Perceptual objective listening quality assessment".

[26] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".

[27] Recommendation ITU-T G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free

operation in systems with low frame loss".
ETSI
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8 Final draft ETSI ES 202 718 V1.3.1 (2017-07)

[28] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive

Multi-Rate Wideband (AMR-WB)".

[29] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals

and gateways".
[30] IETF RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".

[31] ETSI EG 202 396-3: "Speech and multimedia Transmission Quality (STQ); Speech Quality

performance in the presence of background noise Part 3: Background noise transmission -

Objective test methods".
2.2 Informative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are not necessary for the application of the present document but they assist the

user with regard to a particular subject area.

[i.1] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

implementation of VoIP reference point".

[i.2] IETF RFC 2833: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".

[i.3] IETF RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals".

[i.4] Void.

[i.5] ETSI TS 102 929: "Speech and multimedia Transmission Quality (STQ); Procedures for the

identification and selection of common modes of de-jitter buffers and echo cancellers".

[i.6] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field

reproduction method for terminal testing including a background noise database".
3 Definitions and abbreviations
3.1 Definitions

For the purposes of the present document, the following terms and definitions apply:

0dBr point: reference point always located at the digital side of the gateway, for IP-IP gateways located at the input of

the MGW under test
NOTE: See Recommendation ITU-T G.100.1 [6].

2-wire interface: in the context of the present document, telephony analogue interface over 2-wires used in the local

loop

4-wire interface: in the context of the present document, 4-wire digital interface with separate channels for both

directions, irrespective of the physical transmission technology

codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions

of transmission in the same equipment

Composite Source Signal (CSS): signal composed in time by various signal elements

MGW with 2-wire interface: MGW with an analogue 2-wire interface (ATA)
ETSI
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9 Final draft ETSI ES 202 718 V1.3.1 (2017-07)
MGW with 4-wire interface: MGW with only 4-wire interfaces
EXAMPLE: ITA, IP-to-IP and wireless access points.

receive direction: direction from packet switched interfaces towards a synchronous interface (e.g. ISDN, analogue) or

between two packet switched interfaces (for media gateways with packet switched transport on only one side)

NOTE: For media gateways with packet switched transport on both sides (IP-to-IP-MGW), the requirements of

the receive direction have to be applied in both directions.

receive interface: interface in the measurement setup, where a receive signal is injected and/or a send signal is

measured

send direction: direction from a synchronous interface (e.g. ISDN, analogue) towards a packet switched interface (for

media gateways with packet switched interface on only one side)

NOTE: For media gateways with packet switched interfaces on both sides the requirements of the send direction

are not relevant.

send interface: interface in the measurement setup, where a send signal is injected and/or a receive signal is measured

wireless home MGW: home MGW with wireless interface to the phone
EXAMPLE: Wifi or DECT.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AM-FM Amplitude Modulation - Frequency Modulation
AMR Adaptive Multi Rate codec
ATA Analogue Terminal Adapter
CLR Circuit Loudness Rating
CS Composite Source
CSS Composite Source Signal
DECT Digital E
...

SLOVENSKI STANDARD
SIST ES 202 718 V1.3.1:2018
01-maj-2018
.DNRYRVWSUHQRVDJRYRUDLQYHþSUHGVWDYQLKYVHELQ 674 3UHQRVQH]DKWHYH]D
R]NRSDVRYQHLQãLURNRSDVRYQHGRPDþHSUHKRGHLQPHGLMVNHSUHKRGHSR
SURWRNROX,3JOHGHQDNDNRYRVWVWRULWHY 4R6 NRWMLKGRMHPDXSRUDEQLN

Speech and multimedia Transmission Quality (STQ) - Transmission Requirements for IP-

based Narrowband and Wideband Home and Network Media Gateways from a QoS
Perspective as Perceived by the User
Ta slovenski standard je istoveten z: ETSI ES 202 718 V1.3.1 (2017-09)
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ES 202 718 V1.3.1:2018 en

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

---------------------- Page: 1 ----------------------
SIST ES 202 718 V1.3.1:2018
---------------------- Page: 2 ----------------------
SIST ES 202 718 V1.3.1:2018
ETSI ES 202 718 V1.3.1 (2017-09)
ETSI STANDARD
Speech and multimedia Transmission Quality (STQ);
Transmission Requirements for IP-based Narrowband and
Wideband Home and Network Media Gateways from
a QoS Perspective as Perceived by the User
---------------------- Page: 3 ----------------------
SIST ES 202 718 V1.3.1:2018
2 ETSI ES 202 718 V1.3.1 (2017-09)
Reference
RES/STQ-252
Keywords
QoS, speech
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Copyright Notification

No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying

and microfilm except as authorized by written permission of ETSI.

The content of the PDF version shall not be modified without the written authorization of ETSI.

The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2017.
All rights reserved.
TM TM TM

DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP and LTE™ are trademarks of ETSI registered for the benefit of its Members and

of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members.

GSM® and the GSM logo are trademarks registered and owned by the GSM Association.

ETSI
---------------------- Page: 4 ----------------------
SIST ES 202 718 V1.3.1:2018
3 ETSI ES 202 718 V1.3.1 (2017-09)
Contents

Intellectual Property Rights ................................................................................................................................ 5

Foreword ............................................................................................................................................................. 5

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 8

3 Definitions and abbreviations ................................................................................................................... 8

3.1 Definitions .......................................................................................................................................................... 8

3.2 Abbreviations ..................................................................................................................................................... 9

4 General considerations ........................................................................................................................... 10

4.1 Default Coding Algorithm ................................................................................................................................ 10

4.2 End-to-end considerations ................................................................................................................................ 10

4.3 Parameters to be investigated ........................................................................................................................... 11

4.3.1 Applicability of parameters to different MGWs ......................................................................................... 11

5 Test equipment ....................................................................................................................................... 12

5.1 IP half channel measurement adaptor ............................................................................................................... 12

5.2 Environmental conditions for tests ................................................................................................................... 12

5.3 Accuracy of measurements and test signal generation ..................................................................................... 13

5.4 Network impairment simulation ....................................................................................................................... 13

6 Requirements and associated Measurement Methodologies .................................................................. 14

6.0 General ............................................................................................................................................................. 14

6.1 Test setup.......................................................................................................................................................... 14

6.1.0 General ........................................................................................................................................................ 14

6.1.1 Setup for Media Gateways with 4-wire interface ....................................................................................... 15

6.1.2 Setup for Media Gateways with 2-wire interface ....................................................................................... 15

6.1.3 Setup for Media Gateways with Wireless Access ....................................................................................... 16

6.1.4 Setup for IP-to-IP Media Gateways ............................................................................................................ 17

6.1.5 Test Signal Levels ....................................................................................................................................... 17

6.1.6 Background noise simulation ...................................................................................................................... 17

6.1.7 Echo paths ................................................................................................................................................... 18

6.2 Coding independent parameters ....................................................................................................................... 19

6.2.1 Send Frequency response ............................................................................................................................ 19

6.2.2 Circuit Loudness Rating in Send ................................................................................................................ 20

6.2.3 Linearity Range for CLR (SND) ................................................................................................................. 20

6.2.4 Send Distortion ........................................................................................................................................... 22

6.2.5 Spurious Out-of-Band Signals in Send direction ........................................................................................ 22

6.2.6 Send Noise .................................................................................................................................................. 23

6.2.7 Receive Frequency Response ..................................................................................................................... 23

6.2.8 Circuit Loudness Rating in Receive ........................................................................................................... 24

6.2.9 Linearity Range for CLR (RCV) ................................................................................................................ 25

6.2.10 Receive Distortion ...................................................................................................................................... 26

6.2.11 Out-of-Band Signals Wideband to Narrowband Transcoding .................................................................... 27

6.2.12 Spurious Out-of-band Signals Narrowband to Wideband Transcoding ...................................................... 27

6.2.13 Minimum Activation Level and Sensitivity in Receive Direction .............................................................. 28

6.2.14 Receive Noise ............................................................................................................................................. 28

6.2.15 Double Talk Performance ........................................................................................................................... 29

6.2.15.0 General .................................................................................................................................................. 29

6.2.15.1 Attenuation Range in Send Direction during Double Talk A ......................................................... 29

H,S,dt

6.2.15.2 Attenuation Range in Receive Direction during Double Talk A .................................................... 30

H,R,dt

6.2.15.3 Detection of Echo Components during Double Talk ............................................................................ 31

ETSI
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SIST ES 202 718 V1.3.1:2018
4 ETSI ES 202 718 V1.3.1 (2017-09)

6.2.15.4 Minimum Activation Level and Sensitivity of Double Talk Detection ................................................ 33

6.2.16 Switching Characteristics ........................................................................................................................... 33

6.2.16.0 General .................................................................................................................................................. 33

6.2.16.1 Activation in Send Direction ................................................................................................................. 34

6.2.16.2 Activation in Receive Direction ............................................................................................................ 34

6.2.16.3 Silence Suppression and Comfort Noise Generation ............................................................................ 35

6.2.17 Background Noise Performance ................................................................................................................. 35

6.2.17.0 General .................................................................................................................................................. 35

6.2.17.1 Performance in Send Direction in the Presence of Background Noise ................................................. 35

6.2.17.2 Quality of Speech with Background Noise ........................................................................................... 36

6.2.17.3 Quality of Background Noise Transmission (with Far End Speech) .................................................... 37

6.2.17.4 Quality of Background Noise Transmission (with Near End Speech) .................................................. 38

6.2.18 Quality of Echo Cancellation ...................................................................................................................... 38

6.2.18.0 General .................................................................................................................................................. 38

6.2.18.1 Echo Performance According to Recommendation ITU-T G.168 ........................................................ 38

6.2.18.2 Terminal Coupling Loss (TCLw, NB) .................................................................................................. 39

6.2.18.3 Terminal Coupling Loss (TCL, WB) .................................................................................................... 39

6.2.18.4 Temporal Echo Effects .......................................................................................................................... 40

6.2.18.5 Spectral Echo Attenuation ..................................................................................................................... 41

6.2.18.6 Occurrence of Artefacts ........................................................................................................................ 41

6.2.18.7 Variable Echo Paths .............................................................................................................................. 41

6.2.19 Variant Impairments; Network dependant .................................................................................................. 42

6.2.19.1 Clock Accuracy Send ............................................................................................................................ 42

6.2.19.2 Clock Accuracy Receive ....................................................................................................................... 42

6.2.19.3 Send Packet Delay Variation................................................................................................................. 42

6.2.20 Immunity to DTMF False Detection in Send Direction .............................................................................. 43

6.2.21 Send and receive delay - round trip delay ................................................................................................... 43

6.3 Codec Specific Requirements........................................................................................................................... 44

6.3.1 Objective Listening Speech Quality MOS-LQO in Send direction ............................................................ 44

6.3.2 Objective Listening Quality MOS-LQO in Receive direction .................................................................... 45

6.3.3 Quality of Jitter buffer adjustment .............................................................................................................. 48

Annex A (informative): Impulse Response of a Narrowband and Wideband DECT PP ................ 50

Annex B (normative): Test signal for immunity to DTMF false detection in send direction ........ 52

Annex C (informative): Example IP Delay variation .......................................................................... 53

Annex D (informative): Bibliography ................................................................................................... 54

History .............................................................................................................................................................. 55

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Intellectual Property Rights
Essential patents

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 (https://ipr.etsi.org/).

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.
Trademarks

The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.

ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no

right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does

not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.

Foreword

This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission

Quality (STQ).
Modal verbs terminology

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and

"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of

provisions).

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

Introduction

Traditionally, the analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the

fast growth of IP networks, packet-switched networks (VoIP) interfacing PSTN networks and mobile networks, as well

as different types of IP-terminals, are being rapidly introduced. Different types of gateways are used to interconnect to

such IP networks. Since the IP networks will be in many cases interworking with the traditional PSTN and private

networks, many of the basic transmission requirements have to be harmonized between these different types of network

from an end-to-end perspective, including specifications for the edge points.

The present document covers IP-based narrowband and wideband home and network media gateways. It aims to

enhance the interoperability and end-to-end quality.

In contrast to other standards which define minimum performance requirements, it is the intention of the present

document to specify gateway equipment requirements which enable manufacturers and service providers to enable

end-to-end speech performance as perceived by the user. These requirements are absolutely necessary to ensure a good

quality, but they are not sufficient. They have to be combined with requirements (and associated relevant measurement

methods) for other elements in the transmission chain (core IP network, PSTN, terminals), as well as for the whole

mouth-to-ear transmission path.
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1 Scope

The present document provides speech transmission performance requirements for narrowband and wideband media

gateways from a QoS perspective as perceived by the user. Media gateways can be network or home based, they may

include a transcoding function. The present document covers the following types of IP-based media gateways:

• ATA (Analogue Terminal Adapter), home gateway IP to POTS
• ITA (ISDN Terminal Adapter), home gateway IP to ISDN
• IAD (Integrated Access device), home router including ATA or ITA
• Network based ATA and ITA
• Carrier grade media gateway, network gateway IP to TDM

• IP-to-IP media gateway, network gateway with transcoding and/or other media processing

• New Generation DECT Fixed part with IP interface (only parameters not covered by New Generation DECT)

Interfaces of media gateways used together with terminals as a system (i.e. connected via Ethernet or with a proprietary

interface) are excluded in the present document and should be measured according to the relevant terminal standard.

If a media gateway includes more than one interface type (e.g. POTS and ISDN), each interface has to be dealt with

differently.

The requirements available in the present document will ensure a high compatibility with IP-and TDM-based fixed and

wireless terminals and networks, including DECT and mobile terminals.

It is the aim to optimize interoperability, the listening and talking quality and the conversational performance. Related

requirements and test methods are defined in the present document.

The present document does not apply to media gateways with 4-wire analogue interfaces.

The requirements for MGWs with respect to voiceband data (VBD) are out of scope in the present document. These

requirements are covered in ETSI TS 102 929 [i.5].
2 References
2.1 Normative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

https://docbox.etsi.org/Reference/.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are necessary for the application of the present document.

[1] ETSI EN 300 726: "Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full

Rate (EFR) speech transcoding (GSM 06.60)".

[2] ETSI TS 126 171 (V6.0.0): "Digital cellular telecommunications system (Phase 2+); Universal

Mobile Telecommunications System (UMTS); AMR speech codec, wideband; General description

(3GPP TS 26.171 version 6.0.0 Release 6)".
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[3] Recommendation ITU-T G.107: "The E-model, a computational model for use in transmission

planning".

[4] Recommendation ITU-T G.108, including amendments 1 and 2: "Application of the E-model:

A planning guide".

[5] Recommendation ITU-T G.109: "Definition of categories of speech transmission quality".

[6] Recommendation ITU-T G.100.1: "The use of the decibel and of relative levels in speechband

telecommunications".

[7] Recommendation ITU-T G.111: "Loudness Ratings (LRs) in an international connection".

[8] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in

international connections".

[9] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".

[10] Recommendation ITU-T G.723.1: "Dual rate speech coder for multimedia communications

transmitting at 5.3 and 6.3 kbit/s".

[11] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code

Modulation (ADPCM)".

[12] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-

code-excited linear prediction (CS-ACELP)".

[13] Recommendation ITU-T G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s

scalable wideband coder bitstream interoperable with G.729".
[14] Void.

[15] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".

[16] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of

hands-free terminals".
[17] Recommendation ITU-T P.501: "Test signals for use in telephonometry".

[18] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using

complex test signals".
[19] Recommendation ITU-T P.56: "Objective measurement of active speech level".

[20] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters. -

Part 1: Specification".
[21] Recommendation ITU-T P.800.1: "Mean Opinion Score (MOS) terminology".

[22] ETSI TS 102 971: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics of a 2-wire analogue interface

for short line interface".

[23] ETSI ES 201 970: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented

Network Termination Point (NTP)".
[24] Recommendation ITU-T G.168: "Digital network echo cancellers".

[25] Recommendation ITU-T P.863: "Perceptual objective listening quality assessment".

[26] Recommendation ITU-T G.722: "7 kHz audio-coding within 64 kbit/s".

[27] Recommendation ITU-T G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free

operation in systems with low frame loss".
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[28] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive

Multi-Rate Wideband (AMR-WB)".

[29] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals

and gateways".
[30] IETF RFC 3550: "RTP: A Transport Protocol for Real-Time Applications".

[31] ETSI EG 202 396-3: "Speech and multimedia Transmission Quality (STQ); Speech Quality

performance in the presence of background noise Part 3: Background noise transmission -

Objective test methods".
2.2 Informative references

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

referenced document (including any amendments) applies.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.

The following referenced documents are not necessary for the application of the present document but they assist the

user with regard to a particular subject area.

[i.1] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

implementation of VoIP reference point".

[i.2] IETF RFC 2833: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".

[i.3] IETF RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals".

[i.4] Void.

[i.5] ETSI TS 102 929: "Speech and multimedia Transmission Quality (STQ); Procedures for the

identification and selection of common modes of de-jitter buffers and echo cancellers".

[i.6] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field

reproduction method for terminal testing including a background noise database".
3 Definitions and abbreviations
3.1 Definitions

For the purposes of the present document, the following terms and definitions apply:

0dBr point: reference point always located at the digital side of the gateway, for IP-IP gateways located at the input of

the MGW under test
NOTE: See Recommendation ITU-T G.100.1 [6].

2-wire interface: in the context of the present document, telephony analogue interface over 2-wires used in the local

loop

4-wire interface: in the context of the present document, 4-wire digital interface with separate channels for both

directions, irrespective of the physical transmission technology

codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions

of transmission in the same equipment

Composite Source Signal (CSS): signal composed in time by various signal elements

MGW with 2-wire interface: MGW with an analogue 2-wire interface (ATA)
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MGW with 4-wire interface: MGW with only 4-wire interfaces
EXAMPLE: ITA, IP-to-IP and wireless access points.

receive direction: direction from packet switched interfaces towards a synchronous interface (e.g. ISDN, analogue) or

between two packet switched interfaces (for media gateways with packet switched transport on only one side)

NOTE: For media gateways with packet switched transport on both sides (IP-to-IP-MGW), the requirements of

the receive direction have t
...

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