Value Added Services for Next Generation Networks to test the search for the real added value in modern communication systems. The book begins with an analysis of SOTW to PSTN / GSM operators and new entrants and the threat they would face. The author discusses the fundamentals of genuine communication services and positions service providers' early, it will take you on a tour through the landscape of NGN standards, contrasting the 3GPP IMS architecture with years of IETF, UMA, and OMA. This book highlights how, technically, this is the NGN can be interconnected, or glued, to infrastructure / existing PSTN GSM, justify the choice of protocol and network architecture. This also explains the general concepts, architectural requirements, and technology in modern VAS platform and new VAS for the NGN in terms of network implementation, end-user experience, business scope, and cost / revenue projections. But is NGN just a game of investment in equipment, of CAPEX and OPEX savings? Where NGN and VAS ultimately go?