On my cell, most often the screen says "SCAM LIKELY" and I don't answer.
Our office at home has cable tv in the corner and all screens show the phone number. We found that 90% of the time, if a city name appears, it's a recording. Aside from that, sales callers are very few.
I found with live talkers, many say "how is your day going" which most people answer in an affirmative. Instead of answering, I dead-end the question with my own question like "were you needing an estimate today". For some reason not answering their questions and picking my own dialogue cuts the matter to a halt pretty quick.
I don't always just hang up, because there's a few legit callers that actually had a potentially interesting product. or something.