| Summary: | 碩士 === 國立中興大學 === 電機工程學系所 === 95 === In this thesis we will implement an interception system for VOIP(Voice over IP) on the IXDPG425 development board. Although there are already many discussions about the security of VoIP and legal problems of interception system in recent years, there still has not been a specification to show how to implement an interception system for VoIP. At this thesis, we will integrate SIP Express Router (SER) and the interception software, TCPdump on the Intel IXDPG425 development board. By letting all the SIP packets passing through the SER, it will then be able to record the call information needed by the interception system. Step by step, we will introduce the specification of the Intel IXP425 processor and the Intel IXDPG425 development board. Then, the software systems including embedded Linux operation system、application program and communication protocol will be explained. Finally, we will show how to build the environment of development system and how to compile the embedded Linux operation system and application programs in order to complete our Interception system for VoIP.
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