I am repeatedly getting calls from this number with no caller ID information.  Further, when I did accidentally answer, there was only silence on the other end.

Whenever you answer a call, but no one responds on the caller's side, it is a robot call.  Companies that market directly to phone numbers using real people, use an automated system to "screen" numbers they randomly pick from a list so the system knows to differentiate between fax numbers, dead lines, or real personal lines.  Once you answer it they know from now on they can use a live person to call you (it is cheaper for them to screen automatically before paying someone to make calls).  The best thing to do when you receive a call from a number you do not recognize is simply not to answer it.  IF it is a legit call the person on the other end can always leave you a voice mail message...

It does not help to be on the do not call List , I think they use the List to get YOUR NUMBER!!!

No one on the other end of the line

had this number call 7 times today.... I just kept on ignoring the call. I answered it once, and a lady on the other end told me her name and that she was in branson missouri... I just hung up.