基于安全協(xié)議VoIP系統(tǒng)的設計與實現(xiàn)
[Abstract]:With the rapid development of network, (VoIP) technology based on IP network has been developed into a special communication technology, and its application is more and more extensive. In addition to the quality of service and other issues, the security requirements of VoIP network are increasingly high, especially some customers involved in sensitive information, such as banks, government departments and so on, are facing the threat of eavesdropping or attacking. Therefore, how to ensure the security of both sides of communication has become an important issue in the field of VoIP. Based on the above problems, the basic voice function of SIP protocol and the secure voice communication of various services are proposed to satisfy the security of the 8048 router voice component in various situations. The whole voice system is based on Linux environment and implemented on Comware V7 platform. The system includes the central management control module, the number management module, the initial session negotiation module, the media control and forwarding module, the telephone drive control module and so on. Through the analysis of the whole VoIP system, we need to realize the above functions in the media control forwarding module and the initial session negotiation module. The initial session negotiation module negotiates various kinds of calls through the SIP protocol. According to the speech flow, the sequential diagram of the speech negotiation is given step by step, including the basic call, the trunk function of the back call, and so on. By carrying their own SDP messages in different SIP messages, the session information is established through negotiation. The media control and forwarding module manages the transmission of RTCP packets. According to the SRTP protocol, the corresponding media RTCP packets are encrypted. Through SIP protocol and SRTP protocol, the system comprehensively analyzes the voice flow. Besides satisfying the basic secure call, the system also realizes more comprehensive business, optimizes negotiation and media forwarding, and supports the security of media flow in more cases. The voice quality of the secure call is also satisfied with the unsecured call performance.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN916.5
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