The document discusses the transition from existing telecommunication networks to Next Generation Networks (NGNs). It defines NGNs as packet-based networks that can provide telecommunication services using multiple broadband technologies. NGNs are built on Internet Protocol and allow unrestricted access between users and service providers. The document also outlines the key characteristics and architecture of NGNs, including separation into access, core, control and service layers. Finally, it discusses some of the important services that will be enabled by NGNs and emphasizes that the transition to NGNs is an ongoing evolution rather than an overnight change.