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Next generation network (NGN) is a broad term used to describe architectural evolution and innovation in telecommunication and access networking. Next generation networks are used to transmit all kinds of services and information including voice data/calls, audio data/calls and multimedia information such as videos. All kinds of such data are encapsulated in data packet form.
NGN is a packet-based network that provides services like broadband, telecommunication and is also able to use QoS.
A NGN is a purely based on Internet technology, including MPLS and IP. It uses H.323 protocol as its major component. Softswitch is the most important device used in NGN and it is only designed for voice applications.