Method for supporting on-line conference in ip-pbx, ip-pbx therefor, method for distributed processing of on-line conference using the same and system thereof

PURPOSE: A method for supporting an online conference in an IP-PBX(Internet Protocol-Private Branch eXchange), the IP-PBX therefor, a method for distributively processing an online conference using the same, and a system thereof are provided to have a video conference or a voice conference using the IP-PBX without a separate video conference system. CONSTITUTION: A session control unit(115) connects a terminal of a participant connected to an IP-PBX with a session for an online conference through a communication network connected to the IP-PBX. An IVR(Interactive Voice Response) providing unit(140) provides a voice guide to be transmitted to a participant connected to a session for the online conference until the online conference starts. A media processing unit(110) processes media data including at least voice received from a transmitting unit of the terminal connected to the session. The media processing unit transmits the media data in a format that a receiving unit of the terminal connected to the session can use.