The Intelligent Network, typically stated as its acronym IN, is a network architecture intended both for fixed as well as mobile telecom networks. It allows operators to differentiate themselves by providing value-added services in addition to the standard telecom services such as PSTN, ISDN and GSM services on mobile phones.
The intelligence is provided by network nodes on the service layer, distinct from the switching layer of the core network, as opposed to solutions based on intelligence in the core switches or telephone equipments. The IN nodes are typically owned by telecommunications operators (Telecommunications Service Providers).
IN is based on the Signaling System #7 (SS7) protocol between telephone network switching centers and other network nodes owned by network operators.
resource: http://en.wikipedia.org/wiki/Intelligent_network#Examples_of_IN_services
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