Calls my office, leaves no message. When calling back, an auto attendant answer asks for me to "enter a 5 digit calling code now". The auto attendant keeps repeating that same message over and over.

This is clearly some kind of scam caller, but for what purpose is unclear.

Called 07/05/14 at 6:06 PM and 07/06/14 at 11:43 AM.  Caller ID is Out Of Area.

this number has called several times - leaves no message - suspect it to be a scam call

Keeps Calling, Does Not Leave Message.

Called on 9/24 14 at 350pm and Chuck couldnt even read his script.