In the past two days alone, I've gotten over 20 spam calls with none of them leaving a message. Just 3/4 seconds of silence on my voice mail. One call the other day left a 22 second blank message.
My phone number was owned by a non-for-profit, and I'm still getting their calls 5-6 years later. Google Pixel phones have a phone-bot that picks up calls, introduces itself as a bot and asks you why you're calling. So I just posted my phone number on my website to make sure people don't think that it's still the nfp