is the predominant choice of modes in North America.

Physical network

SS7 separates signaling from the voice circuits. An SS7 network must be made up of SS7-capable equipment from end to end in order to provide its full functionality. The network can be made up of several link types (A, B, C, D, E, and F) and three signaling nodes - Service Switching Points (SSPs), Signal Transfer Points (STPs), and Service Control Points

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