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Telephone transmission quality, telephone installations, local line networks  
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P.10

Vocabulary for performance, quality of service and quality of experience  

P.11

Effect of transmission impairments  

P.16

Subjective effects of direct crosstalk; thresholds of audibility and intelligibility  

P.30

Transmission performance of group audio terminals (GATs)  

P.32

Evaluation of the efficiency of telephone booths and acoustic hoods  

P.33

[Withdrawn] Subscriber telephone sets containing either loudspeaking receivers or microphones associated with amplifiers  
Deleted after the relevant information contained in this Recommendation was incorporated in new ITU-T P.340

P.35

Handset telephones  

P.36

Efficiency of devices for preventing the occurrence of excessive acoustic pressure by telephone receivers  

P.38

[Withdrawn] Transmission characteristics of operator telephone systems (OTS)  

P.48

Specification for an intermediate reference system  

P.50

Artificial voices  

P.51

Artificial mouth  

P.52

Volume meters  

P.53

Psophometer for use on telephone-type circuits  
This Recommendation is published under alias number O.41

P.54

Sound level meters (apparatus for the objective measurement of room noise)  

P.55

Apparatus for the measurement of impulsive noise  

P.56

Objective measurement of active speech level  

P.57

Artificial ears  

P.58

Head and torso simulator for telephonometry  

P.59

Artificial conversational speech  

P.61

Methods for the calibration of condenser microphones  

P.62

[Withdrawn] Measurements on subscribers' telephone equipment  
P.62 is out of date and was deleted. The relevant text therein will be transferred to ITU-T P.35 during its revision

P.63

[Withdrawn] Methods for the evaluation of transmission quality on the basis of objective measurements  
As this Recommendation didn't contain technical description, but only references to other out of date Recommendations and Supplements, it became obsolete and was deleted

P.64

Determination of sensitivity/frequency characteristics of local telephone systems  

P.65

[Withdrawn] Objective instrumentation for the determination of loudness ratings  
P.65 is out of date and was deleted. The relevant text therein was transferred to ITU-T P.64

P.66

[Withdrawn] Methods for evaluating the transmission performance of digital telephone sets  
Deleted after having been merged with P.31 into ITU-T P.310

P.75

Standard conditioning method for handsets with carbon microphones  

P.76

Determination of loudness ratings; fundamental principles  

P.78

Subjective testing method for determination of loudness ratings in accordance with Recommendation P.76  

P.79

Calculation of loudness ratings for telephone sets  
Covering note, May 2000: Erratum Covering note, 24 October 2000: Corrigendum 1

P.80

Methods for subjective determination of transmission quality  
Renumbered P.800 when revised in 1996

P.82

[Withdrawn] Method for evaluation of service from the standpoint of speech transmission quality  
ITU-T P.82 - formerly P.77 (1984) - was deleted on 2009-06-30 since the four-point MOS scale that it describes is obsolete and replaced by the five-point scales defined in ITU-T P.800, P.800.1 and P.805

P.84

Subjective listening test method for evaluating digital circuit multiplication and packetized voice systems  

P.85

A method for subjective performance assessment of the quality of speech voice output devices  

P.300

Transmission performance of group audio terminals (GATs)  

P.310

Transmission characteristics for narrow-band digital handset and headset telephones  

P.31

Transmission characteristics for digital telephones  

P.311

Transmission characteristics for wideband digital handset and headset telephones  

P.313

Transmission characteristics for cordless and mobile digital terminals  

P.330

Speech processing devices for acoustic enhancement  

P.340

Transmission characteristics and speech quality parameters of hands-free terminals  
Former Rec. P.34, renumbered P.340

P.Imp340

Implementers' Guide for Recommendation ITU-T P.340  

P.34

Transmission characteristics of hands-free telephones  

P.341

Transmission characteristics for wideband digital loudspeaking and hands-free telephony terminals  

P.342

Transmission characteristics for narrow-band digital loudspeaking and hands-free telephony terminals  

P.350

Handset dimensions  

P.360

Efficiency of devices for preventing the occurrence of excessive acoustic pressure by telephone receivers and assessment of daily noise exposure of telephone users  
Former Rec. P.36, renumbered P.360

P.370

Coupling hearing aids to telephone sets  
Former Rec. P.37, renumbered P.370

P.37

Coupling hearing aids to telephone sets  

P.380

Electro-acoustic measurements on headsets  

P.381

Technical requirements and test methods for analogue wired headsets or headphones and corresponding universal interface of terminals  

P.382

Technical requirements and test methods for analogue wired multi-microphone headsets or headphones and corresponding universal interface of terminals  

P.383

Technical requirements and test methods for digital headsets or headphones and corresponding interfaces of terminals  

P.501

Test signals for use in telephony and other speech-based applications  
This Recommendation includes an electronic attachment containing test signals for telephonometry applications

P.502

Objective test methods for speech communication systems using complex test signals  

P.505

One-view visualization of speech quality measurement results  

P.561

In-service non-intrusive measurement device - Voice service measurements  

P.562

Analysis and interpretation of INMD voice-service measurements  

P.563

Single-ended method for objective speech quality assessment in narrow-band telephony applications  

P.Imp563

Implementers' Guide for Recommendation ITU-T P.563  

P.564

Conformance testing for voice over IP transmission quality assessment models  

P.565

Framework for creation and performance testing of machine learning based models for the assessment of transmission network impact on speech quality for mobile packet-switched voice services  

P.565.1

Machine learning model for the assessment of transmission network impact on speech quality for mobile packet-switched voice services  

P.570

Artificial noise fields under laboratory conditions  

P.581

Use of head and torso simulator for hands-free and handset terminal testing  

P.700

Calculation of loudness for speech communication  

P.800

Methods for subjective determination of transmission quality  
Former Rec. P.80

P.800.1

Mean opinion score (MOS) terminology  

P.800.2

Mean opinion score interpretation and reporting  

P.804

Subjective diagnostic test method for conversational speech quality analysis  

P.805

Subjective evaluation of conversational quality  

P.806

A subjective quality test methodology using multiple rating scales  

P.807

Subjective test methodology for assessing speech intelligibility  

P.808

Subjective evaluation of speech quality with a crowdsourcing approach  

P.809

Subjective evaluation methods for gaming quality  

P.81

Modulated noise reference unit (MNRU)  

P.810

Modulated noise reference unit (MNRU)  

P.811

Subjective test methodology for evaluating Speech oriented stereo communication systems over headphones  

P.812

Principles of subjective test methods for interactive virtual reality (VR) applications  

P.83

Subjective performance assessment of telephone-band and wideband digital codecs  

P.Imp830

Implementers' Guide for Recommendation ITU-T P.830: Subjective performance assessment of telephone-band and wideband digital codecs  

P.830

Subjective performance assessment of telephone-band and wideband digital codecs  

P.831

Subjective performance evaluation of network echo cancellers  

P.832

Subjective performance evaluation of hands-free terminals  

P.833

Methodology for derivation of equipment impairment factors from subjective listening-only tests  

P.833.1

Methodology for the derivation of equipment impairment factors from subjective listening-only tests for wideband speech codecs  

P.833.2

Methodology for the derivation of equipment impairment factors from subjective listening-only tests for fullband speech codecs  

P.834

Methodology for the derivation of equipment impairment factors from instrumental models  

P.834.1

Extension of the methodology for the derivation of equipment impairment factors from instrumental models for wideband speech codecs  

P.834.2

Extension of the methodology for the derivation of equipment impairment factors from instrumental models for fullband speech codecs  

P.835

Subjective test methodology for evaluating speech communication systems that include noise suppression algorithm  

P.836

Simulating conversations for the prediction of speech quality  

P.840

Subjective listening test method for evaluating circuit multiplication equipment  
Former ITU-T P.84

P.851

Subjective quality evaluation of telephone services based on spoken dialogue systems  

P.852

Subjective quality evaluation of text-based chatbots  

P.861

[Withdrawn] Objective quality measurement of telephone-band (300-3400 Hz) speech codecs  
P.861 was recognized as having certain limitations in specific areas of application. It was replaced by P.862, which contains an improved objective speech quality assessment algorithm. P.861 included one diskette containing test vectors for implementation verification of the PSQM algorithm

P.862

[Withdrawn] Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs  
P.862, P.862.1, P.862.2 and P.862.3 are out of date and were deleted on 5 January 2024. Please refer to P.863, P.863.1 and P.863.2.

P.862.1

[Withdrawn] Mapping function for transforming P.862 raw result scores to MOS-LQO  
P.862, P.862.1, P.862.2 and P.862.3 are out of date and were deleted on 5 January 2024. Please refer to P.863, P.863.1 and P.863.2.

P.862.2

[Withdrawn] Wideband extension to Recommendation P.862 for the assessment of wideband telephone networks and speech codecs  
P.862, P.862.1, P.862.2 and P.862.3 are out of date and were deleted on 5 January 2024. Please refer to P.863, P.863.1 and P.863.2.

P.862.3

[Withdrawn] Application guide for objective quality measurement based on Recommendations P.862, P.862.1 and P.862.2  
P.862, P.862.1, P.862.2 and P.862.3 are out of date and were deleted on 5 January 2024. Please refer to P.863, P.863.1 and P.863.2.

P.863

Perceptual objective listening quality prediction  

P.Imp863

Implementers' Guide for Recommendation ITU-T P.863  

P.863.1

Application guide for Recommendation ITU-T P.863  

P.863.2

Extension of ITU-T P.863 for multidimensional assessment of degradations in telephony speech signals up to fullband  
The electronic attachment to Recommendation ITU-T P.863.2 (2024) can be downloaded from https://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=100015010

P.880

Continuous evaluation of time-varying speech quality  

P.910

Subjective video quality assessment methods for multimedia applications  

P.911

[Withdrawn] Subjective audiovisual quality assessment methods for multimedia applications  
Deleted on 2 February 2024 after its content was incorporated into ITU-T P.910.

P.912

Subjective video quality assessment methods for recognition tasks  

P.913

[Withdrawn] Methods for the subjective assessment of video quality, audio quality and audiovisual quality of Internet video and distribution quality television in any environment  
Deleted on 2 February 2024 after its content was incorporated into ITU-T P.910.

P.914

Display requirements for 3D video quality assessment  

P.915

Subjective assessment methods for 3D video quality  

P.916

Information and guidelines for assessing and minimizing visual discomfort and visual fatigue from 3D video  

P.917

Subjective test methodology for assessing impact of initial loading delay on quality of experience  

P.918

Dimension-based subjective quality evaluation for video content  

P.919

Subjective test methodologies for 360º video on head-mounted displays  

P.920

Interactive test methods for audiovisual communications  

P.930

Principles of a reference impairment system for video  

P.931

Multimedia communications delay, synchronization and frame rate measurement  

P.1010

Fundamental voice transmission objectives for VoIP terminals and gateways  

P.1100

Narrowband hands-free communication in motor vehicles  

P.1110

Wideband hands-free communication in motor vehicles  

P.1120

Super-wideband and fullband stereo hands-free communication in motor vehicles  

P.1130

Subsystem requirements for automotive speech services  

P.1140

Speech communication requirements for emergency calls originating from vehicles  

P.1150

In-car communication audio specification  

P.1201

Parametric non-intrusive assessment of audiovisual media streaming quality  

P.1201.1

Parametric non-intrusive assessment of audiovisual media streaming quality - Lower resolution application area  

P.1201.2

Parametric non-intrusive assessment of audiovisual media streaming quality - Higher resolution application area  

P.1202

Parametric non-intrusive bitstream assessment of video media streaming quality  

P.1202.1

Parametric non-intrusive bitstream assessment of video media streaming quality - Lower resolution application area  

P.1202.2

Parametric non-intrusive bitstream assessment of video media streaming quality - Higher resolution application area  

P.1203

Parametric bitstream-based quality assessment of progressive download and adaptive audiovisual streaming services over reliable transport  

P.1203.1

Parametric bitstream-based quality assessment of progressive download and adaptive audiovisual streaming services over reliable transport - Video quality estimation module  

P.1203.2

Parametric bitstream-based quality assessment of progressive download and adaptive audiovisual streaming services over reliable transport - Audio quality estimation module  

P.1203.3

Parametric bitstream-based quality assessment of progressive download and adaptive audiovisual streaming services over reliable transport - Quality integration module  

P.1204

Video quality assessment of streaming services over reliable transport for resolutions up to 4K  

P.1204.3

Video quality assessment of streaming services over reliable transport for resolutions up to 4K with access to full bitstream information  

P.1204.4

Video quality assessment of streaming services over reliable transport for resolutions up to 4K with access to full and reduced reference pixel information  

P.1204.5

Video quality assessment of streaming services over reliable transport for resolutions up to 4K with access to transport and received pixel information  

P.1211

Derivation procedure for contribution values to quality degradation of adaptive audiovisual streaming services  

P.1301

Subjective quality evaluation of audio and audiovisual multiparty telemeetings  

P.1302

Subjective method for simulated conversation tests addressing speech and audiovisual call quality  

P.1305

Effect of delays on telemeeting quality  

P.1310

Spatial audio meetings quality evaluation  

P.1311

Method for determining the intelligibility of multiple concurrent talkers  

P.1312

Method for the measurement of the communication effectiveness of multiparty telemeetings using task performance  

P.1320

Quality of experience assessment of extended reality meetings  

P.1401

Methods, metrics and procedures for statistical evaluation, qualification and comparison of objective quality prediction models  

P.1402

Guidance for the development of machine-learning-based solutions for QoS/QoE prediction and network performance management in telecommunication scenarios  

P.1501

Subjective testing methodology for web browsing  

P.1502

Methodology for QoE testing of digital financial services  

P.1503

Extended methodology for cross-country and inter-operator digital financial services testing  

P.Sup1

[Withdrawn] Precautions to be taken for correct installation and maintenance of an IRS  

P.Sup3

[Withdrawn] Models for predicting transmission quality from objective measurements  

P.Sup10

Considerations relating to transmission characteristics for analogue handset telephones  

P.Sup11

[Withdrawn] Some effects of sidetone  

P.Sup14

[Withdrawn] Subjective performance assessment of digital processes using the modulated noise reference unit (MNRU)  

P.Sup15

[Withdrawn] Wideband (7 kHz) modulated noise reference unit (MNRU) with noise shaping  

P.Sup16

Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)  

P.Sup17

[Withdrawn] Direct loudness balance against the intermediate reference system (IRS) for the subjective determination of loudness ratings  
Replaced by annex D of P.78

P.Sup19

[Withdrawn] Information on some loudness loss related ratings  

P.Sup20

Examples of measurements of handset receive-frequency responses: dependence on earcap leakage losses  

P.Sup21

[Withdrawn] The principles of a composite source signal as an example of a measurement signal to determine the transfer characteristics of terminal equipment  

P.Sup22

[Withdrawn] Transmission characteristics of wideband audio telephones  
Replaced by ITU-T P.311 and P.341

P.Sup23

ITU-T coded-speech database  

P.Sup24

Parameters describing the interaction with spoken dialogue systems  

P.Sup25

Parameters describing the interaction with multimodal dialogue systems  

P.Sup26

Scenarios for the subjective evaluation of audio and audiovisual multiparty telemeeting quality  

P.Sup27

Application of ITU-T P.863 and ITU-T P.863.1 for speech processed by blind bandwidth extension approaches  

P.Sup28

Considerations for the development of new QoS and QoE related objective models to be embedded in Recommendations prepared by ITU-T Study Group 12  

P.Sup29

ITU-T P.800 - Use cases  

P.Sup30

Considerations on the automation of digital financial services testing  

 

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Updated : 2024-09-30