Design And Implementation Of Audio And Video Transmission Based On RTP/RTCP Protocol In VoIP System

VoIP is a new technology which has emerged since last decade and it has broad prospects for development。Audio-streaming of VoIP is transferred through the internet。Real-time communication has been occupied a dominant position in the internet application with the development of computer networks and communication technology。IP phone as the next generation telephone has been taken seriously and the reasons for that is the quality of its voice which is transferred by communication service manager and the ratio of IP information。Simultaneously,another important factor is the cost of communication is cheaper than the traditional phone。Transmission of Voice-data through Internet has some features,such as real-time,continuity,burst characteristics and so on,and these factors make the transmission of VoIP-data different from the traditional model。In the real-time communication,it provided UDP's services and the traditional internet protocol has been unable to satisfy the demand of real-time communication。In this situation,IETF developed the RTP standard which is located between application layer and transmission layer and which could complete the communication between audio-streaming and video-streaming perfectly。It avoids the defection of TCP such as pool real-time in communication。Simultaneously,it reduces the network delay and enhances effect of communication。This paper talked a VoIP system developed on linux,The main goal is completed communication of audio and video by RTP protocol,The major work is as follows:1,Introduced VoIP-related protocol,Including:SIP and RTP protocol, Futhermore,analysis of the characteristics about them,and raise to adopt the protocol of RTP to complete the design of real-time data transmission。2,Development of the real-time transmission of audio and video on linux system,And based on the original result I realize the two-way's communication mode of audio and video。3,Analysis of the quality of audio and video's transmission,and I got statistical real-time data in communication 4,Finally,I compare my research with the more mature of the current VoIP phone——Linphone in function,and make outlook for my research subject。...