Conference system

A conference system, comprising an Internet Protocol-Private Branch Exchange (IP-PBX) subsystem and a conference subsystem, wherein

• the IP-PBX subsystem comprises a PBX service module, a Session Initiation Protocol (SIP) proxy service module, and a plurality of Session Border Controller (SBC) modules;
• the SIP proxy service module is configured to transmit signaling between the PBX service module and the SBC modules, find an accessible conference subsystem, and enable the IP-PBX subsystem to interwork with the accessible conference subsystem;
• and
• the conference subsystem comprises a conference room connector, and the conference room connector is configured to connect a videoconferencing device to the conference system for registration, and receive the signaling between the PBX service module and the SBC modules that is transmitted by the SIP proxy service module;
• wherein the SBC module is configured to connect a telephone terminal to the IP-PBX subsystem;
• the telephone terminal comprises second SIP terminals that are respectively connected to the SBC modules;
• and the videoconferencing device comprises first SIP terminals connected to the conference room connector;
• wherein the conference subsystem uses a private protocol;
• and the PBX service module is configured to process calls from the second SIP terminals connected to the SBC modules and from the conference room connector;
• and
• when an IP-PBX number is invited to join a conference, the conference room connector is further configured to send an invitation message to the PBX service module, to enable the second SIP terminal to join the conference.