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Voice communication is fundamental to the normal operation of the society. The general public have put a lot of trust in voice communication and they have been relying on it for many critical and sensitive information exchange (e.g., Emergency 911 calls, calls to customer service of financial institutions). Now more and more voice calls are carried, at least partially, over the public Internet rather than traditional Public Switched Telephone Network (PSTN). The security ramifications of using VoIP, however, have not been fully recognized. It is not clear how secure and trustworthy the currently deployed VoIP systems are, and there exists a substantial gap in the understanding of the potential impact of VoIP exploits on the VoIP users.
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