This document discusses the benefits of migrating from a legacy telephone network to a Next Generation Network (NGN). It notes that legacy networks are becoming obsolete as they are based on 100-year old technology for carrying telephone calls. In contrast, an NGN uses fiber optics and Internet Protocol (IP) standards to provide high bandwidth, seamless delivery of data, voice and video, and compatibility worldwide. The document outlines a three step process for businesses to evolve their networks through migration, convergence of all communications over the NGN, and transformation enabled by the network's agility. It stresses that choosing an NGN provider is an important decision that should only need to be made once.