The CCITT (the Intemational 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 o
ITU-T D.197-1991 history
1991ITU-T D.197-1991 Notification of Change of Address(es) for Accounting and Settlement Purposes (Study Group III) 6 pp