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This book addresses a need in the computer technology market where there are no books covering security on Voice Over Internet Protocol (VoIP) and networks. There are many books about security, but none that deal in telephony technologies. Voice and Data Security will enable readers to: protect data networks from the most common threats; learn what security vulnerabilities currently exist in data networks become aware of the threats the telephone network poses to the data network; use updated information to protect the data network from the telephone network; useful ways to AVOID telephone network intrusions and attacks; and learn VoIP and the security implications of this transmission technique.