International Journal of Computer Science and Mobile Computing (IJCSMC)
VoIP stands for Voice over Internet Protocol and is a way to carry voice traffic over computer networks like the Internet. Over the last decade VoIP has become increasingly popular, gaining millions of subscribers every year (e.g. LINE and WECHAT provide voice call facilities) and has certainly caught the eye of telecommunication service providers all over the world. The driving factor for the success of VoIP is cost reduction, both for users and providers. But VoIP doesn't only bring reduced costs it also brings threats and vulnerabilities since it is IP based it's susceptible to large number of threats.