Caller ID displayed as "Unknown Name", following by an unrecognizable number. I let it go to my answering machine to screen the call. They didn't leave a message. I dialed the number back and encountered a recorded message that said, "Thanks for calling. The survey you were called for has now finished. If you would like to be removed from our list for future calls, please press 9." I then hung up.

The recording did not identify itself what organization it belongs to.