I have recently retired, and am "in house" much more than previously. I typically get at least one or two calls per day in spite of being on the do not call list. Those calls are almost always timed to be at or near "lunchtime".
But this morning, for the first time EVER, I got two junk calls before 8AM. I am considering having the answering machine pick up after two rings on ALL incoming calls, and ONLY calling back those who actually leave a name, number, and subject.
Hook a fax machine to you pone for the next few weeks works every time.