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Voice over IP (VoIP), also known as Internet telephony, is gaining market share rapidly and now competes favorably as one of the visible applications of the Internet. Nevertheless, being an application running over the TCP/IP suite, it is susceptible to flooding attacks. If flooded, as a time-sensitive service, VoIP may show noticeable service degradation and even encounter sudden service disruptions. Because multiple protocols are involved in a VoIP service and most of them are susceptible to flooding, an effective solution must be able to detect and overcome hybrid floods. As a solution, the paper offers the VoIP Flooding Detection System (vFDS) - an online statistical anomaly detection framework that generates alerts based on abnormal variations in a selected hybrid collection of traffic flows.
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