
A Signal Transfer Point (STP) is a router that relays SS7 messages between signaling end-points (SEPs) and other signaling transfer points (STPs). Typical SEPs include service switching points (SSPs) and service control points (SCPs). The STP is connected to adjacent SEPs and STPs via signaling links. Based on the address fields of the SS7 message...
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http://en.wikipedia.org/wiki/Signal_Transfer_Point

a node in a signalling network, handling signal messages and transferring them from one signalling link to another
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=714-12-07
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