The Design And Research Of SIP Based Conference Phone

With the rapid development of the computer and network technology, there has an increasing focus on the multimedia communication while the VoIP is the typical representative of this series. This terminal is no longer the phone in the traditional sense, but an application platform which can provide customers a variety of multimedia services. Currently, H.323 and SIP are two major signaling protocols standards in the real-time communication system. Although H.323 is a more mature technology, but SIP will replace it for the sake of its features such as low cost, simplicity, flexibility and ease of scalability. Therefore, it will become the core protocol in 3G networks and play an increasingly important role in NGN.This paper studies the SIP based conference phone system. Firstly, we discuss the key module such as the signaling control protocol and the multimedia technology, and then elaborate on the implement ideas and specific processes of these modules. After that, the realization of this terminal program is given by the integration of each module. In addition, in order to meet the multi-party conferencing, this paper gives the distributed and centralized conference models, and proposes the two-tier centralized conference model which not only can be conductive to centralized control conference but also can help the conference creator to reduce the burden of data transmission from the meeting. In this model, the conference participants are divided by the model into two types, one way and two-way interaction, and are classified as two-stage model in according with specific rules. Demonstration and analysis through simulation experiment shows the rationality of the system model.