International Journal of Engineering Research and Applications (IJERA)
With the development of computing technology, Voice over Internet Protocol (VoIP) has been established as an alternative to carry out a telephone conversation over a data network. VoIP products promise converged telecommunication and data services that are cheaper, more versatile and provide good quality and security as compared to traditional offerings. There are a number of VoIP solutions for mobile phones and the VoIP telephony supports the management functions. Security threats of VoIP devices are denial of service attack, eavesdropping, man-in-the middle attack, call hijack, spoofing attack, call fraud.