I believe the resurgence in VoIP technology is partly due to the Unified Communication platforms that ride on VoIP / SIP trunks… there are a few other reasons VoIP is once again on the horizon as pointed out by this article.

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http://europe.businesschief.com/technology/1812/Feature:-Why-years-after-the-hype-VoIP-for-businesses-is-hot-again

Feature: Why, years after the hype, VoIP for businesses is hot again