The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of
the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations
ITU-T D.79-1991 history
1991ITU-T D.79-1991 Charging and Accounting Principles for the International Videotex Service (Study Group III) 8 pp