Although caller ID showed the caller as "Unknown Name," out of curiosity, I finally answered.  The caller confirmed my first name, then identified himself with the Republican National Committee and asked if I would make a donation of $100 or $200 to the RNC.  That's when I hung up.  I have received 8 calls from Unknown Name using 410-697-5050 and 410-697-5056 over the past  month; my guess is these calls come from the same source.