| Summary: | 碩士 === 樹德科技大學 === 資訊工程學系 === 94 === Lawful intercepting will be the best tools while a law enforcement agency to invest the crime. Investigate in initial stage, have no specific target, filter range to be relatively spacious, so go on by way of recording mostly to work to monitor. In crime investigate latter stage, usually grasp specific target, intercept work can grasp talk content of intercepted people who monitor immediately to pay attention to at this moment usually.
The primary focus is put on SIP-Based VoIP protocol, networking environment and communication- supervise manage mechanism in the thesis. To use a Dial-out Loop in the PSTN Gateway equipment direct the voice contents from packet-switching to circuit-switching and then back. Let PSTN lawful interception system to intercept the VoIP. Lawful enforcement agency can read the voice contents in synchronization for this way, and solve packet process cause the poor efficiency under interception.
Utilize a platform intercepted of Asterisk Open PBX construction, and implement the DOL method, to monitor the conversation content from outside circuit in platform, get the content of talking immediately that can be recognized. Intercepted both sides while chain into the mechanism of monitoring, to monitoring the host computer finally, do efficiency and influence of quality to assess.
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