<a href="http://sourceforge.net/projects/vipervast/files/VIPER_VASTbetav2.76.iso/download">http://sourceforge.net/projects/vipervast/files/VIPER_VASTbetav2.76.iso/download</a>
<a href="http://www.hackingvoip.com/sec_tools.html">http://www.hackingvoip.com/sec_tools.html</a>
<a href="http://www.symantec.com/connect/articles/voip-hopping-method-testing-voip-security-or-voice-vlans">http://www.symantec.com/connect/articles/voip-hopping-method-testing-voip-security-or-voice-vlans</a>
<a href="http://www.symantec.com/connect/articles/two-attacks-against-voip">http://www.symantec.com/connect/articles/two-attacks-against-voip</a>
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