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ITU-T P.564 (07/2006)

Conformance testing for narrowband voice over IP transmission quality assessment models

This Recommendation specifies the minimum criteria for objective speech quality assessment models that predict the impact of observed IP network impairments on the one-way listening quality experienced by the end-user in IP/UDP/RTP-based 3.1-kHz narrowband telephony applications. Models compliant with this Recommendation predict Mean Opinion Scores (MOS) on the ACR Listening Quality scale. It is expected that the primary applications for such models are monitoring of transmission quality for operations and maintenance purposes, and measurements in support of service level agreements (SLAs) between service providers and their customers. P.564-conformant models may be deployed both in end-point locations and at mid-network monitoring points.This Recommendation includes an electronic attachment containing the test vectors.

Citation:	https://handle.itu.int/11.1002/1000/8861
Series title:	P series: Telephone transmission quality, telephone installations, local line networks P.500-P.599: Objective measuring apparatus
Approval date:	2006-07-14
Provisional name:	P.VTQ
Approval process:	AAP
Status:	Superseded
Observation:	This Recommendation includes an electronic attachment containing the test vectors for conformance testing of voice over IP transmission quality assessment models
Maintenance responsibility:	ITU-T Study Group 12
Further details:	Patent statement(s) Development history Associated test signals

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
2	P.564 (11/2007)	In force	here	here	here
1	P.564 (07/2006)	Superseded	here	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
P Suppl. 10 (11/1988)	Considerations relating to transmission characteristics for analogue handset telephones	In force	-	here	here
P Suppl. 16 (11/1988)	Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)	In force	-	here	here
P Suppl. 20 (03/1993)	Examples of measurements of handset receive-frequency responses: dependence on earcap leakage losses	In force	-	here	here
P Suppl. 23 (02/1998)	ITU-T coded-speech database	In force	here	here	here
P Suppl. 24 (10/2005)	Parameters describing the interaction with spoken dialogue systems	In force	here	here	here
P Suppl. 25 (01/2011)	Parameters describing the interaction with multimodal dialogue systems	In force	here	here	here
P Suppl. 26 (09/2017)	Scenarios for the subjective evaluation of audio and audiovisual multiparty telemeeting quality	In force	here	here	here
P Suppl. 28 (09/2020)	Considerations for the development of new QoS and QoE related objective models to be embedded in Recommendations prepared by ITU-T Study Group 12	In force	here	here	here
P Suppl. 31 (01/2025)	Subjective quality evaluation of audiovisual communication in videotelephony services	In force	here	here	here

Title	Approved on	Download
Addition to Section 2.3 of the Handbook on Telephonometry	2000	here
Addition to Section 3 of the Handbook on Telephonometry	2000	here
Additions to the Handbook on Telephonometry	1999	here
Telephonometry	1992	here

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ITU-T Recommendations

ITU-T P.564 (07/2006)