A type of alarm verification in which a central station operator places one or more phone calls in an attempt to verify that a real alarm has occurred and not a false alarm. Typically the first call placed is to the alarmed premise, where the operator asks for a false alarm password if there is an answer. If there is no answer, depending on the local alarm dispatch procedures, the operator may try one or more additional phone numbers in an attempt to reach someone. Eventually without an answer, the operator will dispatch the authorities to the non-verified alarm. Local jurisdictions that utilize enhanced call verification (operator must place 2 phone calls before dispatching an alarm event) have found that it greatly reduces the number of false alarms.

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