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The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) 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.

Quick facts: Abbreviation, Type, Legal status, Headquarter...
International Telecommunication Union Telecommunication Standardization Sector
AbbreviationITU-T / UIT-T
TypeITU sector
Legal statusActive
HeadquartersGeneva, Switzerland
Chaesub Lee
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, Global Initiative on Digital Financial Services, Global Initiative on AI and Data Commons

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 Chaesub Lee (of South Korea), whose first 4-year term commenced on 1 January 2015,[1] and whose second 4-year term commenced on 1 January 2019. Chaesub Lee succeeded Malcolm Johnson of the United Kingdom, who was director from 1 January 2007 until 31 December 2014.