Seeking advice on how to make a rotary dial phone have a busy signal when answered
Hi all, I'm working on a Just For Laughs-type hidden camera prank show and I need to build a prop rotary dial phone that, when answered, has a busy signal. I would prefer, if possible, to hide any additional parts inside the body of the phone. Also, just a note, the phone doesn't have to ring.
If you have any advice I would love to hear!!!