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Several Articles on VoIP Security by Jon Arnold on Toolbox
Jun 27, 2014 •
Jon Arnold made several blog posts on toolbox.com on VoIP security. Here is a link to the latest one, discussing toll fraud:
http://it.toolbox.com/blogs/voip-news/two-more-things-to-know-about-toll-fraud-61803
There are several other articles – check them out.