Date Added: Mar 2013
VoIP is a communication protocol which is being widely used and voice calls are transmitted over an IP network such as internet instead of Public Switched Telephone Networks (PSTN). VoIP converts voice into digital signal that travels over the internet and the audio output device makes the digital to audio conversation at the receiver side. In today's time people are using these technologies in their daily life, for communication over the internet but they are not aware with the security issues on VoIP conversation. There are different types of security issues with VoIP conversation. The main focus on this paper is to introduce different security attacks and defense approaches for security attacks on VoIP conversation.