As we have looked at previously, there are three categorically different types of cloud business phone system companies in the marketplace: do-it-yourself mass market vendors, carrier service providers, and established cloud solutions providers.Clearly, you want to partner with a cloud solutions provider, and steer as clear as possible from the other types of companies — because your happiness, success, ROI and shortest path to value all depend on it.To help you make this critical choice — and filter out companies that are unworthy of your time from those that deserve your consideration — here are 5 questions to ask prospective...