Engineer Osman Bakhach, Director of the Central Media Office of Hizb ut Tahrir gave a speech via Skype under the title, "Role of the Scholars in the Establishment of the Khilafah "Caliphate"" that was held in Jakarta, Indonesia on Tuesday, 18 Dhu al-Qi'dah 1434 AH corresponding to 24 September 2013 CE.