Unified communication is a communication mode which uses computer technology and traditional communication. Using of advanced technology to break the current communication method to equipment and network as the center limit, so that people as long as the most commonly use of communication tools and applications, in the enterprise internal and colleagues, customers and partners, it can be easy and efficient to communicate. In this paper, the existing enterprise unified communications project as the background, the main research module of the conference. The conference module was designed, and the process and principle of the MQTT protocol and conference call were introduced. Finally, the design and research of experiments were carried out. Finally we realized the function of the telephone conference call and the multimedia conference communication.