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Abbreviation for International Telecommunication Union--Telecommunication Standardization Bureau. The Telecommunications Standardization Sector of the International Telecommunication Union (ITU). Note 1: ITU-T is responsible for studying technical, operating, and tariff Questions and issuing Recommendations on them, with the goal of standardizing telecommunications worldwide. Note 2: The ITU-T combines the standards-setting activities of the predecessor organizations formerly called the International Telegraph and Telephone Consultative Committee (CCITT) and the International Radio Consultative Committee (CCIR).