Hello, I am working on an electronic circuit that needs to be able to detect when the other party hangs up, so it can disconnect from the line. I have asked this in the electronic forums and they say there is no universal signal that tells that the other end has hung-up. I have my doubts, since my answering machine stops recording on its cassette immediately after the party hangs up. How is that done?
Thank you, Zach, NTS