Dean Elwood, one of the founders of voipuser.org (a free VoIP service provider and online magazine) recently wrote an interesting article called “How To Build A Voip Network: 7 rules for the VoIP entrepreneur in 2007.“  It’s a great read from someone with experience of creating value from a VoIP service, rather than the usual marketing “talking head”.  It also raises some interesting VoIP security questions, including Session Border Controllers, Lawful Intercept, Denial of Service and confidentiality.