International Journal of Advanced Research in Computer Science and Software Engineering (IJARCSSE)
Voice over internet protocol has become a popular alternative to public switched telephone network. The flexibility and cost efficiency are the key factors luring enterprises to transition to VoIP. As VoIP technology matures and become increasingly popular so it also gains the attention of the attacker who attacks on the VoIP conversation and wishes to eardrop the conversation. In this paper the authors first describe the phrase spotting technique used to eavesdrop the conversation and defence approach for eavesdropping attack.