Voice over IP (VoIP) is now the predominant technology for enabling people to communicate, and represents the majority of systems and devices in enterprises. VoIP is also heavily used by both service providers and consumers. Because VoIP is such as broad area, this book primarily focuses on the security issues present for enterprise systems. However, many of threats, attacks, and countermeasures are relevant in other environments as well.

The term VoIP is being replaced with unified communications (UC), which covers additional forms of real-time communications, including video, messaging, presence, and social networking. Although voice remains the predominant form of real-time communications within UC (and that is where we will ...

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