Dendritic cell algorithm for preventing spam over IP telephony

SPam over IP Telephony (SPIT) is an emerging threat in the telecom era of Voice over IP Networks (VoIP). Though evolved from email spam, SPIT is more obstructive and intrusive in nature as they require response from the callee. Contemplating the behavior of SPIT, a provider based system is contributed with the proposed mechanism installed on the SIP proxy server. In this work, a biologically inspired Dendritic Cell Algorithm (DCA) is proposed to prevent the spam callers from penetrating the network. The algorithm uses Dendritic Cells (DCs) to collect signals from multiple inputs and perform data fusion with them. To study the behavior of spam calls and the impact of proposed mechanism, experimental testbed is formed in the research lab and the performance evaluation is accomplished. Results obtained are convincing and hence validating the performance and accuracy of the system.