The CCI’IT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of
the International Telecommunication Union (ITU). CCIIIT is responsible for studying technical, operating and tariff questions and issuing Recommendation
ITU-T E.431-1992 history
1992ITU-T E.431-1992 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp