H. 323 protocol is currently being used most widely in VoIP network a signaling protocol, including the system structure of h. 323 terminal, gateway, keep close and multipoint control unit (MCU), h. 323, the overall goal of realization of h. 323 media flow exchange between endpoints, h. 323 protocol is a big family, including the many relevant agreement, forming a protocol stack, media exchange is RTP, by running on top of UDP to realize, so long as has the RTP, RTCP is cannot little, RTP protocol for audio, video and other real-time data provide end-to-end delivery service, can send back to the receiving endpoint necessary for real-time signal timing and sequence information, RTCP protocol to send and receive the two sides and network operators to provide QoS monitoring means,
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