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Next Generation Networks (NGNs) aims at providing a wide range of services to end-users over an access independent platform while allowing for better Quality of Service (QoS), charging mechanism and integration of services as compared to conventional fixed or mobile networks. The NGN core network is known as IP Multimedia Subsystem (IMS) which is the Third Generation Partnership Project (3GPP) standardized core network for all IP-convergence of fixed and mobile networks. The core functionality of the IMS is built on the Session Initiation Protocol (SIP), the Internet Engineering Task Force (IETF) standardized protocol for the creation, management and termination of multimedia sessions on the internet.
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