<Dl> <Dt> Radio communication (ITU - R) </Dt> <Dd> Established in 1927 as the International Radio Consultative Committee or CCIR (from its French name "Comité consultatif international pour la radio"), this sector manages the international radio - frequency spectrum and satellite orbit resources . In 1992, the CCIR became the ITU - R . </Dd> <Dt> Standardization (ITU - T) </Dt> <Dd> Standardization was the original purpose of ITU since its inception . Established in 1956 as the International Telephone and Telegraph Consultative Committee or CCITT (from its French name "Comité consultatif international téléphonique et télégraphique"), this sector standardizes global telecommunications (except for radio). In 1993, the CCITT became the ITU - T . </Dd> <Dt> Development (ITU - D) </Dt> <Dd> Established in 1992, this sector helps spread equitable, sustainable and affordable access to information and communication technologies (ICT). </Dd> <Dt> ITU Telecom </Dt> <Dd> ITU Telecom organizes major events for the world's ICT community . </Dd> </Dl> <Dt> Radio communication (ITU - R) </Dt> <Dd> Established in 1927 as the International Radio Consultative Committee or CCIR (from its French name "Comité consultatif international pour la radio"), this sector manages the international radio - frequency spectrum and satellite orbit resources . In 1992, the CCIR became the ITU - R . </Dd> <Dt> Standardization (ITU - T) </Dt>

. what is the international telecommunication union (itu) and where is it headquartered