-Signaling Links, Signal Transfer Point, Service Control Point : Provide special routing services.
2.
When operating in the " quasi-associated mode ", SS7 signaling progresses from the originating signal transfer points.
3.
For example : a signaling gateway is often part of a softswitch in modern Signal Transfer Point ( STP ).
4.
The SSP is responsible for sending call information to the service control point ( SCP ), routing the request through at least one signal transfer point ( STP ) in the Signalling System 7 ( SS7 ) network.
5.
If the call is local, the switch has the NPA-NXX in its routing table as portable, so it sends a routing request to the Signal Transfer Point ( STP ) which accesses a local database that is updated by an LSMS ( Local Service Management System ) which holds all routing for all ported numbers to which the carrier is responsible for completing calls.
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