This is clever: Telemarketers know we don’t want to talk to them. Their latest trick is to spoof the caller ID to make it look like they’re calling from a phone number with the same prefix/exchange and area code as yours. They could be calling from anywhere, but you’re more likely to answer if you think it might be a neighbor. And once they have you, you’re more likely to buy. As with spammers, this is a never-ending fight.
I once had an idea for a device that would pick up the telephone on the first ring. It would put the caller on the speaker, but not connect the microphone until you actually pick it up. You’d get to listen to sounds and voices on the other end, but the caller would continue to hear fake ringing as though you hadn’t answered yet. It’s a safe bet that somebody’s already done this.
Yes, this is a mean trick. I never bothered with the idea, although I’ve had modems in the past that could have done it if I’d written the right software. It’s a privacy violation of sorts that I wouldn’t do to a friend. Of course, telemarketers are fair game, but not everyone is.