The Islamic Republic of Iran Broadcasting (IRIB; Persian: سازمان صداوسیمای جمهوری اسلامی ایران, romanized: Sazmân-e Seda-o-sima-ye Jomhuri-ye Eslâmi-ye Irân, lit. 'Voice and Vision Service of the Islamic Republic of Iran') or Seda o Sima (Persian: صدا و سیمای, lit. 'Voice and Vision') for short, formerly called National Iranian Radio and Television until the Iranian revolution of 1979, is an Iranian state-controlled media corporation that holds a monopoly of domestic radio and television services in Iran. It is also among the largest media organizations in Asia and the Pacific region and a regular member of the Asia-Pacific Broadcasting Union.