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A service switching point (SSP) is an end-point used by a telecommunications system such as telephone switches and performs call processing on calls that start, tandem or end at that site. SSPs can be connected to one another using Signaling System No.7 (SS7) links. SSPs may produce or receive SS7 messages for transferring call-related information. They may also send queries to service control points (SCPs) in order to discover the methods for processing a service request or call.