The ïïü Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to
ITU-T U.1-1993 history
1993ITU-T U.1-1993 Signalling Conditions to Be Applied in the International Telex Service