In a world of unified networks, phones are easy prey for hackers

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Unified communications—bundling all communications channels on a single IP platform—offers the promise of simplified IT management and cost savings, because an enterprise has to maintain and manage a single network rather than separate networks for voice and data. But as voice becomes just another data service, phones are being increasingly exposed to threats from the Internet.

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Story added 7. May 2013, content source with full text you can find at link above.