Back in 1989, I worked with a guy who did some troubleshooting on a machine, then got the modem to connect by whistling at it down the phone line. I didn't see

Back in 1989, I worked with a guy who did some troubleshooting on a machine, then got the modem to connect by whistling at it down the phone line. I didn't see or hear it happening, but I had no reason to doubt him.