ITU is the United Nations agency for information and communication technologies. ITU-T is the Telecommunication Standardization Sector.

ITU is based in Geneva, Switzerland, and its membership includes 191 Member States and more than 700 Sector Members and Associates. The function of ITU-T is to provide global telecommunication standards by studying technical, operating and tariff questions.


Membership of ITU is open to governments, which may join the Union as Member States, as well as to private organizations like carriers, equipment manufacturers, funding bodies, research and development organizations and international and regional telecommunication organizations, which can join ITU as Sector Members.


The results of these studies are published as ITU-T Recommendations.