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The majority of companies are doing something - ranging from pilots to full deployments - with Voice Over IP. At the same time, nearly 80% of IT professionals say it's vital to build a business case for any technology deployment, particularly given macro-economic problems, reduced IT budgets, and smaller IT staffs. It's often difficult to build the business case, though, since it's hard to judge how much implementation and ongoing operations will cost prior to actually deploying the technology. VOIP represents a new paradigm for real-time communications - it's different from expanding TDM by adding a new PBX or a network with new routers.
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