A method includes programmatically placing a first call to a destination phone number associated with a line, and recording the first call as a first recording; receiving a signal corresponding to an incoming call directed to a first phone number; determining, based on stored data representing association of the first phone number with the destination phone number, that the destination phone number is associated with the first phone number; routing, based on the determination that the destination phone number is associated with the first phone number, call data corresponding to the incoming call to a destination device associated with the destination phone number, and recording the call as a second recording; comparing the second recording to the first recording, and effecting communication, based on a determination that the first and second recordings match, of an alert to one or more phone numbers.