The market for telecommunications services in Europe has developed extremely dynamically since being liberalized. This white paper published by T-Systems describes about Next Generation Network (NGN). The International Telecommunication Union (ITU), a global organization dedicated to technical aspects of telecommunications regards an NGN as a network with an end-to-end service for voice, data and multimedia. All the services are based on the Internet Protocol (IP). It describes that the basic premise for NGN is architecture on several independent levels. These include the access area, the core network area, the control level and the service management level.