I got a call from this number today the first time. Was bo one on the other end except a recording to make it sound like someone was there. It was a SPAM CALL and probably done on a multi-call circuit. i.e. computer calls X numbers at once and the first person to answer gets to talk to a real person the others get the recording to make it sound like someone is on the other end.
I got one of these calls as well and I am supposed to be on a do not call list. I do not appreciate these calls and will not answer them. They did not leave a message either.