International Amateur Radio Union (IARU) Region 1 Region 2 Region 3 (broken link) International Telecommunication Union (ITU) International Organization for Standardization (ISO) International Mobile Satellite Organization (Inmarsat) (broken link) International Electrotechnical Commission (IEC) Information and Communications Technology Standards Board (ICTSB) Committee T1 Telecommunications Pacific Telecommunications Council (PTC) European Radiocommunications Office (ERO) European Telecommunications Standards Institute (ETSI) Intelsat (broken link)