Islamic Republic of Iran Broadcasting, or IRIB (Persian: صدا و سيمای جمهوری اسلامی ايران‎, Sedā va Sima-ye Jomhūrī-ye Eslāmī-ye Īrān, literally Voice (or Sound) and Vision of the Islamic Republic of Iran), formerly called the National Iranian Radio and Television until the Islamic revolution of 1979, is a Iranian media corporation which hold the monopoly of domestic radio and television services in the Islamic Republic of Iran, is also among the largest media organizations in Asian and Pacific region, and a regular member of Asia-Pacific Broadcasting Union.