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Securing Voice over Internet Protocol

In recent years, there has been significant increase in VoIP and internet telephony usage. The users, whether corporate or individuals are subject to the same security risks that have affected data networks for many years. This is mainly because voice networks are IP-based and all IP protocols for sending voice traffic contain flaws. In this paper, we study the security risks associated with the VoIP including vulnerabilities, man-in-the-middle attack, and denial-of-service. We will also review the protection measure that can be taken to make VoIP more secure, such as authorization, authentication, transport layer security, and media encryption.