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OCR: Local Access and Transport Local Access and Transport ATES (LATA) 203 Arsa (LATA) 212 STE Figure 1. Signaling System 7 (SS7) consists of Service Switching Points (SSPs), which originate or terminate calls; Switching Control Points (SCPs), which offer access to databases; and Switching Transfer Points (STPs), which route SS7 information between SSPs and SCPs. Note the many redundant links, particularly between mated STPs