Abstract
VoIP provides real-time voice communications over packet-switched networks. VoIP is widely used as it offers more flexibility when compared to the traditional Public Switched Telephone Network (PSTN). Session Initiation Protocol (SIP) is a protocol used for initiating a session between the caller and the callee in the VoIP system. SIP is a text-oriented protocol and is implemented in a susceptible environment. These features make SIP protocol vulnerable to various security risks such as Denial of Service, Registration hijacking and Eavesdropping. Detection of these attacks plays a vital role. The Survey focuses on different techniques used for detection of DoS attacks and differentiating between the proposed mechanisms for identifying abnormalities and then notifying the end-users about the possible intrusions.
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