"Voice Over Internet Protocol Security is both unique and timely. Ransome and Rittinghouse expertly describe the technical fundamentals, salient business drivers, and converged network infrastructure security risks and challenges IT and security professionals encounter when implementing enterprise-level VoIP systems." — William M. Hancock, Ph.D., CISSP, CISM, CSO, Savvis Communications."This book should be required reading for anyone contemplating a VoIP implementation for three reasons: first, it deals with telecom technology and standards from Alexander Graham Bell onward. This puts VoIP in its proper context as an integral, evolved part of a global system that is potentially vulnerable. Second, it provides a detailed tutorial on all of the major aspects of VoIP implementation from a pragmatic point of view. Finally, it addresses the very real security issues that could put the global telephone system at risk if not dealt with professionally. I would heartily recommend your entire project team buy this book and read it carefully!"— John Milner, MIS Director, Cambridge University