Call came from 336-441-5979 at 12:20 MT.  Busy so did not answer.  Caller left no message.  Pressed the call back feature on the phone and the person answered as "Treasury".  Asked "Who are you?" replied "The Treasury Department".  Asked, Which section of the Treasury Department are you with? --  No reply.  Asked, "Who are you trying to reach?" -- Again No Reply.  Informed person that he had called a U.S. Government office located in a Federal Building and I would transfer his call to the Treasury Department  in the building.  Caller said "I will have my lawyer here in fourty five minutes." Then he hung up.  The 336 area code is from the Piedmont area of North Carolina, so it is highly unlikely that the Treasury would initiate a call to the central part of the US because that is a different region.  Also the male had an accent that sounded as if from India.  In any case, it is not likely that anyone from any government agency would call across regions and all Agents fo the U. S. Government are required to give name, department, devision and name of their supervisor if requested.  Since the telephone number is valid, a report of contact was forwarded to the Office of the Inspector General, Department of Treasury.