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Dan York: Seven Deadliest Unified Communications Attacks (Seven Deadliest Attacks)
David Endler: Hacking Exposed VoIP: Voice Over IP Security Secrets & Solutions (Hacking Exposed)
Alan B. Johnston: Understanding Voice over Ip Security (Artech House Telecommunications Library)
PhD, CISM, CISSP, James F. Ransome: Voice over Internet Protocol (VoIP) Security
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