The CCI’IT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (RU).CCIT？ is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis.The Plenary Assembly of CCI’IT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups.The approval of Recommendations by the members of CCI’IT between Plenary Assemblies is covered by the procedure laid down in CCI’IT Resolution No. 2 (Melbourne, 1988)
ITU-T I.252.4-1992 history
1992ITU-T I.252.4-1992 Call Forwarding Unconditional (Study Group I) 13 pp