I don’t answer anything I don’t recognize and we don’t even look at the caller ID on the land line, because about one in 87 calls is legit.
I only answer my office phone for inside calls. For a while, Bing listed my desk phone as the central number for our entire 20,000 employee agency. That was fun. Lots of people asking for accounts receivable. Fortunately, virtually no one uses Bing.