Mine says:: Telemarketers Hang Up, Political Calls Hang Up, Trying to Sell Something Hang Up, all others leave a message after the tone. Rude, but works on some except auto calls.
Called at 11:00 AM. Hung up after answering machine message. My number is unlisted -- suspect it was a robo-call. I do not answer unknown numbers. If they leave a message, I may return the call at my discretion.