Highly complementary product offering and addition of key personnel broadens CallTower’s position as a leading global communications provider with expanded offerings to meet growing demand -- CallTower Inc., a global leader in delivering cloud-based enterprise-class unified communications and collaboration solutions, announced today that it has purchased Appia Communications Inc., a Traverse City, Michigan based industry leader of cloud-based applications and communication services. In joining forces, CallTower will be able to deliver a broader range of

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