SIST ES 202 718 V1.1.1:2014

SLOVENSKI STANDARD
SIST ES 202 718 V1.1.1:2014
01-oktober-2014
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Speech and multimedia Transmission Quality (STQ) - Transmission Requirements for IP-

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

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

Foreword ............................................................................................................................................................. 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 ............................................................................................................................. 9

4.1 Default Coding Algorithm .................................................................................................................................. 9

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

4.3 Parameters to be investigated ........................................................................................................................... 10

4.3.1 Applicability of parameters to different MGWs ......................................................................................... 10

5 Test equipment ....................................................................................................................................... 11

5.1 IP half channel measurement adaptor ............................................................................................................... 11

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

5.3 Accuracy of measurements and test signal generation ..................................................................................... 12

5.4 Network impairment simulation ....................................................................................................................... 12

6 Requirements and associated Measurement Methodologies .................................................................. 13

6.1 Test setup.......................................................................................................................................................... 13

6.1.1 Setup for Media Gateways with 4-wire interface ....................................................................................... 14

6.1.2 Setup for Media Gateways with 2-wire interface ....................................................................................... 14

6.1.3 Setup for Media Gateways with Wireless Access ....................................................................................... 15

6.1.4 Setup for IP-to-IP Media Gateways ............................................................................................................ 15

6.1.5 Test Signal Levels ....................................................................................................................................... 16

6.1.6 Background noise simulation ...................................................................................................................... 16

6.2 Coding independent parameters ....................................................................................................................... 16

6.2.1 Send Frequency response ............................................................................................................................ 16

6.2.2 Circuit Loudness Rating in Send ................................................................................................................ 17

6.2.3 Linearity Range for CLR (SND) ................................................................................................................. 18

6.2.4 Send Distortion ........................................................................................................................................... 19

6.2.5 Spurious Out-of-Band Signals in Send direction ........................................................................................ 20

6.2.6 Send Noise .................................................................................................................................................. 20

6.2.7 Receive Frequency Response ..................................................................................................................... 20

6.2.8 Circuit Loudness Rating in Receive ........................................................................................................... 21

6.2.9 Linearity Range for CLR (RCV) ................................................................................................................ 22

6.2.10 Receive Distortion ...................................................................................................................................... 23

6.2.11 Out-of-Band Signals Wideband to Narrowband Transcoding .................................................................... 24

6.2.12 Spurious Out-of-band Signals Narrowband to Wideband Transcoding ...................................................... 24

6.2.13 Minimum Activation Level and Sensitivity in Receive Direction .............................................................. 25

6.2.14 Receive Noise ............................................................................................................................................. 25

6.2.15 Double Talk Performance ........................................................................................................................... 26

6.2.15.1 Attenuation Range in Send Direction during Double Talk A ..................................................... 26

6.2.15.2 Attenuation Range in Receive Direction during Double Talk A ................................................ 28

6.2.15.3 Detection of Echo Components during Double Talk ............................................................................ 29

6.2.15.4 Minimum Activation Level and Sensitivity of Double Talk Detection ................................................ 31

6.2.16 Switching Characteristics ........................................................................................................................... 31

6.2.16.1 Activation in Send Direction ................................................................................................................. 31

6.2.16.2 Activation in Receive Direction ............................................................................................................ 32

6.2.16.3 Silence Suppression and Comfort Noise Generation ............................................................................ 33

6.2.17 Background Noise Performance ................................................................................................................. 33

6.2.17.1 Performance in Send Direction in the Presence of Background Noise ................................................. 33

6.2.17.2 Quality of Speech with Background Noise ........................................................................................... 34

6.2.17.3 Quality of Background Noise Transmission (with Far End Speech) .................................................... 35

6.2.17.4 Quality of Background Noise Transmission (with Near End Speech) .................................................. 36

6.2.18 Quality of Echo Cancellation ...................................................................................................................... 36

6.2.18.1 Echo paths ............................................................................................................................................. 36

6.2.18.2 Echo Performance According to ITU-T Recommendation G.168 ........................................................ 37

6.2.18.3 Terminal Coupling Loss (TCLw) .......................................................................................................... 37

6.2.18.4 Temporal Echo Effects .......................................................................................................................... 38

6.2.18.5 Spectral Echo Attenuation ..................................................................................................................... 38

6.2.18.6 Occurrence of Artefacts ........................................................................................................................ 39

6.2.19 Variant Impairments; Network dependant .................................................................................................. 39

6.2.19.1 Clock Accuracy Send ............................................................................................................................ 39

6.2.19.2 Clock Accuracy Receive ....................................................................................................................... 39

6.2.19.3 Send Delay Variation ............................................................................................................................ 40

6.2.19.4 Delay versus Time Receive ................................................................................................................... 40

6.2.19.5 Quality of Jitter buffer adjustment ........................................................................................................ 40

6.2.20 Immunity to DTMF False Detection in Send Direction .............................................................................. 40

6.3 Codec Specific Requirements........................................................................................................................... 41

6.3.1 Send Delay .................................................................................................................................................. 41

6.3.2 Receive delay .............................................................................................................................................. 42

6.3.3 Delay for IP-to-IP MGW ............................................................................................................................ 44

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

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

6.3.5.1 Efficiency of Packet Loss Concealment (PLC) ..................................................................................... 47

6.3.5.2 Efficiency of Delay Variation Removal ................................................................................................ 47

Annex A (informative): Impulse Response of a Narrowband and Wideband DECT PP ................ 48

Annex B (normative): Test signal for immunity to DTMF false detection in send direction ........ 50

Annex C (informative): Bibliography ................................................................................................... 51

History .............................................................................................................................................................. 52

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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

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

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

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

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

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:

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

DECT interfaces of media gateways are excluded from the present document and should be measured according to the

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[14] ITU-T Recommendation G.1020: "Performance parameter definitions for quality of speech and

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

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

[19] ITU-T Recommendation P.862: "Perceptual evaluation of speech quality (PESQ): An objective

method for end-to-end speech quality assessment of narrow-band telephone networks and speech

[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

[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

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

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

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

[29] ITU-T Recommendation P.862.1: "Mapping function for transforming P.862 raw result scores to

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

[i.1] ETSI EG 202 396-1: "Speech and multimedia Transmission Quality (STQ); Speech quality

performance in the presence of background noise; Part 1: Background noise simulation technique

[i.2] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

[i.3] 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 -

[i.4] IETF RFC 2833: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".

[i.5] IETF RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals".

[i.6] ETSI TR 102 927: "Speech and multimedia Transmission Quality (STQ); Packet Loss

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

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

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

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

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

MGW with 4-wire interface: MGW with only 4-wire interfaces, e.g. ITA, IP-to-IP and wireless access points

nominal setting of the volume control: when a receive volume control is provided, the setting which is closest to the

receive direction: the 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

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

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

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

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

Narrowband VoIP gateways shall support the coding algorithm according to ITU-T Recommendation G.711 [9] (both

Wideband VoIP gateways shall support the coding algorithm according to ITU-T Recommendation G.722 [26]. VoIP

NOTE: Associated Packet Loss Concealment (PLC) e.g. as defined in ITU-T Recommendation G.711 [9]

In order to achieve a desired end-to-end speech transmission performance (mouth-to-ear) it is r