It helps to be up to speed in your field; Eric probably knew as much about that switch and how to program and troubleshoot it as the technician. Once he was able to access the switch as an authorized user, he would gain full control over the telephone lines that were his target. From his computer, he queried the switch for the phone number he had been given for law enforcement calls to the DMV, 555-6127. He found there were nineteen other phone lines into the same department. Obviously they handled a high volume of calls.