I suspected the tones could be recorded, ala "WarGames", but in case you didn't notice, those freestanding machines need a phone jack for their modems to connect to and transmit those tones.
I've seem many of those phone jacks exposed and ready to have some Y-phone jack added so someone with a phone cord could make a
REAL good recording of that information.
If you see two cords going into that jack, I'd be real suspicious. ATMs should have a dedicated line like fire/security alarms.
In fact, the last ATM I saw in that state was in a McDonald's.
