The ITU Telecommunication Standardization Sector (ITU-T) is one of the three Sectors (branches) of the International Telecommunication Union (ITU). It is responsible for coordinating standards for telecommunications and Information Communication Technology such as X.509 for cybersecurity, Y.3172 and Y.3173 for machine learning, and H.264/MPEG-4 AVC for video compression, between its Member States, Private Sector Members, and Academia Members.

International Telecommunication Union Telecommunication Standardization Sector
AbbreviationITU-T / UIT-T
TypeITU sector
Legal statusActive
HeadquartersGeneva, Switzerland
Seizo Onoe
Parent organization
International Telecommunication Union
SubsidiariesStudy Group 2, Study Group 3, Study Group 9, Study Group 11, Study Group 12, Study Group 13, Study Group 15, Study Group 16, Study Group 17, Study Group 20, AI for Good, Trustworthy AI

The first meeting of the World Telecommunication Standardization Assembly (WTSA), the sector's governing conference, took place on 1 March of that year. ITU-T has a permanent secretariat called the Telecommunication Standardization Bureau (TSB), which is based at the ITU headquarters in Geneva, Switzerland. The current director of the TSB is Seizo Onoe (of Japan), whose 4-year term commenced on 1 January 2023,. Seizo Onoe succeeded Chaesub Lee of South Korea, who was director from 1 January 2015 until 31 December 2022.

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