Because TCP/IP is not suitable to transmit the data of audio and video frequency, the strategy of data transmitting from server to client is using TCP to transmit controlling signals and adopting UDP/RTP to transmit real time sound and image data.

• 因为TCP/IP不适合传输实时的音视频信号，本系统将从服务器到客户机的数据传输策略制定为：采用TCP来传输控制信息，而用RTP/UDP来传输实时声音和图像数据。