The Next Generation Network (NGN) is a popular phrase used to describe the network that will replace the current PSTN network around the world today used to carry voice, fax, modem signals, etc.
By definition, the NGN is essentially a managed IP-based (i.e., packet-switched) network that enables a wide variety of services. Among those services are VoIP, videoconferencing, Instant Messaging, e-mail, and all other kinds of pakcet-switched communication services.
The ITU defined the term NGN in Recommendation Y.2001 as follows:
Next Generation Network (NGN): a packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.
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