This post explains each step in the dail-up handshake process ... The part we found the most interesting is that these modems needed to disable the echo suppression used by the telephone system ...

If you came of age in the 1990s, you’ll remember the unmistakable auditory handshake of an analog modem negotiating its ...

The resulting audio tones resemble the early modem handshake sounds used in dial-up internet connections. While it remains unclear whether this method is faster than regular speech, the developers ...

After the handshake is completed, you are online with the other computer, and data can be transmitted back and forth. The escape sequence tells the modem to switch from online to command state.