It is the local number for the Region of Durham's nuclear public alert information line. It would provide outgoing message in a nuclear emergency event at the Darlington or Pickering nuclear plants and direct residents to listen to local media for further instructions. The system is tested in the spring and fall. Also tied to a toll free 1-800-551-5373.
Did not answer this call as it rang in as long distance and knew the number was supposedly from Whitby, a local call. If it was Durham Region nuclear public alert I would have thought they would have left a message but none left.