How can I learn whether my ATT internet equipment includes a battery backup and where that back up would be located? Does ATT have a record of where equipment is installed in my home? There is a beeping sound in my basement, 5 beeps every 30 seconds, and I cannot find where it’s coming from. Research on line suggested it may be a low battery warning. It is not the smoke detector and in an all electric house we have no CO detectors.