Dwivedi is a noted expert and researcher on computer security, and he has written this volume on vulnerabilities in Voice over Internet Protocol (VoIP) technologies for readers who need protection against eavesdropping, disrupted phone calls and access to sensitive information. The author describes the assessment and security tools that can be used to identify these breaches in networks such as Cisco, Avaya, Asterisk and Vonage, using VoIP protocols such as H.323, SIP, RTP and IAX. In an effort to raise awareness about these security issues, this volume also explains how hackers are able to attack VoIP networks to inject inappropriate audio content and employ phishing schemes. Annotation 2009 Book News, Inc., Portland, OR (booknews.com)
