It examines the influence of the mobile network and IP technology in the direction of the DI is taking now, and look at the way middleware is to reduce dependence on the service logic of the underlying network protocol. Next Generation Intelligent Networks is investigating how the creation of the service to take a board of state-of-the-art distributed object-oriented programming techniques. This book appears to focus on software architecture for programming and using value-added services, and proposed a vision of value-added services in future networks.