I called the # back. There was about 15 seconds of silence and then a recorded voice said "PRESS 9 TO BE PLACED ON THE DO NOT CALL LIST" - (just my thoughts) - you press 9 and now they know they have an active number!!!!! I didn't press 9.
Just called my home phone. Says "Customer Service". Did not answer. Whoever it was stayed on the line for a couple of seconds after my answering machine message ended, but didn't leave a message.