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ITU-T P.310 (05/2000)

Transmission characteristics for telephone-band (300-3400 Hz) digital telephones

This ITU-T Recommendation provides audio performance requirements and associated testing for telephone band (300-3400 Hz) digital telephones.Requirements and test methods are specified for the major audio transmission parameters including Sending and Receiving Loudness Ratings, frequency response, noise, distortion, spurious signals, sidetone, echo path and delay.This ITU-T Recommendation is only applicable to digital telephones using encoding conforming to ITU-T Recommendations G.711 (64 kbit/s, PCM) and G.726 (32 kbit/s, ADPCM). Lower coding rates, for example ITU-T Recommendation G.728 (16 kbit/s, LD-CELP), are still under study.

Citation:	https://handle.itu.int/11.1002/1000/5077
Series title:	P series: Telephone transmission quality, telephone installations, local line networks P.300-P.399: Voice terminal characteristics
Approval date:	2000-05-18
Approval process:	TAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 12
Further details:	Patent statement(s)

EditionsRelated Supplement(s)

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
6	P.310 (06/2009)	In force	here	here	here
5	P.310 (03/2003)	Superseded	here	here	here
4	P.310 (05/2000)	Superseded	here	here	here
3	P.310 (02/1996)	Superseded	here	here	here
2	P.31 (03/1993)	Superseded	-	here	here
1	P.31 (11/1988)	Superseded	-	-	Not available


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

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ITU-T Recommendations

ITU-T P.310 (05/2000)