The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication tandardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,
ITU-T P.805-2007 history
2007ITU-T P.805-2007 Subjective evaluation of conversational quality Study Group 12
1988ITU-T P.82-1988 Method for Evaluation of Service from the Standpoint of Speech Transmission Quality - Telephone Transmission Quality Study Group XII; 5 pp