The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.
The standardization efforts of ITU commenced in 1865 with the formation of the International Telegraph Union ( ITU). ITU became a United Nations specialized agency in 1947. The International Telegraph and Telephone Consultative Committee (CCITT, from ) was created in 1956, and was renamed ITU-T in 1993.
ITU-T has a permanent secretariat, the Telecommunication Standardization Bureau (TSB), based at the ITU headquarters in Geneva, Switzerland. The current Director of the Bureau is Chaesub Lee, whose 4-year term commenced on 1 January 2015, who replaced Malcolm Johnson of the United Kingdom, who was director from 1 January 2007 to 2014.