I received a call from 202-067-3982 at 9:32 am on 11/10. Caller ID recorded the Unknown Caller's number. I did not pick up - the caller hung up when the recorded came on.
After the first call from this number on 11/10/2015, I have received 3 more calls from the unknown caller - 11/12 and 11/12. I'm going to block the number. I did a reverse number check on this and in Washington, DC there is no number matching this. Whoever and whatever this is (real person or robot) - hangs up when the recorder picks it up. I don't answer calls from Mr. Unknown Caller!