Dial Up Modem Handshake Sound - Spectrogram - YouTube
Spectrogram Visualization of a Dial-Up Modem Handshake Sound
Old Modem, New Internet. | Hackaday
Der 56k Modem Klang - The 56k dialup modem sound - YouTube
TIL the famous sound of dial-up is the "handshake" between the modem and the Internet Service Provider before translating internet data into soundwaves. : r/todayilearned