Security Issues in VoIP Telecommunication Networks

As VoIP telecommunication networks are becoming popular, more and more VoIP calls are being madeto accomplish security critical activities, e.g., E911 services, phone banking. However, the security ram-ifications of using VoIP have not been fully recognized, and there exists a substantial gap in the under-standing of the potential impact of VoIP exploits on the VoIP users. In this chapter, we describe thecomponents and functionalities of non-P2P and P2P VoIP networks and discuss the potential attacksto them such as MITM, spoofing, wiretapping, pharming, etc. We also illustrate a mechanism of usingsmall world network to improve call performance of a P2P VoIP system and evaluate it over the cur-rently deployed OpenVoIP system.