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VoIP Books - VoIP References | IP Communications

Product image Title Author(s) Publisher Lowest price (formatted)
Practical VoIP Security Brian Baskin, Jan Kanclirz Jr., Thomas Porter Syngress $19.98
Voice over Internet Protocol (VoIP) Security John Rittinghouse PhD CISM, James F. Ransome PhD CISM CISSP Digital Press $12.88