Recommendation ITU-T P.310 provides audio performance requirements and associated testing methods for narrow-band (300-3400 Hz) digital handset and headset telephones.Requirements and test methods are specified for the major audio transmission parameters including sending and receiving frequency response,loudness rating,noise,distortion,out-of-band signals,linearity,sidetone,echo and delay.This Recommendation is only applicable to digital telephones using encoding conforming to Recommendations ITU-T G.711 (64 kbit/s, PCM) and ITU-T G.726 (32 kbit/s,ADPCM).IP terminals and wireless headsets are not covered in this recommendation.
ITU-T P.310-2009 Referenced Document
ITU-T G.122-1993 Influence of National Systems on Stability and Talker Echo in International Connections Study Group 12
ITU-T G.131-2003 Talker echo and its control Study Group 12*， 2024-04-19 Update
ITU-T G.711-1988 PULSE CODE MODULATION (PCM) OF VOICE FREQUENCIES
ITU-T G.728-1992 Coding of Speech at 16 kBit/s Using Low-Delay Code Excited Linear Prediction General Aspects of Digital Transmission Systems; Terminal Equipments Study Group XV; 65 pp
ITU-T I.412-1988 ISDN USER-NETWORK INTERFACES INTERFACE STRUCTURES AND ACCESS CAPABILITIES
ITU-T O.131-1988 QUANTIZING DISTORTION MEASURING EQUIPMENT USING A PSEUDO-RANDOM NOISE TEST SIGNAL
ITU-T O.133-1993 EQUIPMENT FOR MEASURING THE PERFORMANCE OF PCM ENCODERS AND DECODERS Study Group IV
ITU-T P.51-1996 Artificial Mouth - Series P: Telephone Transmission Quality Objective Measuring Apparatus Study Group 12; 14 pp
ITU-T P.310-2009 history
2009ITU-T P.310-2009 Transmission characteristics for narrow-band digital handset and headset telephones (Study Group 12)
2003ITU-T P.310-2003 Transmission characteristics for telephone band (300-3400 Hz) digital telephones SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Subscribers' lines and sets Study Group 12