US Robotics 005689-03 Manual page 17

If both modems exchange carrier If both modems exchange carrier
signals but fail to establish a signals but fail to establish a
communications link, communications link,
Place the call again. The telephone
company routes all calls, even local calls,
differently each time you call.
Call a different modem to see if the
problem persists.
The remote modem might be an older 2400
bps modem that doesn't support error
control. Disable error control by entering the
following command in terminal mode:
AT&M0<Enter> and place the call again.
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If your modem doesn't connect at If your modem doesn't connect at
2400 bps with a 2400 bps modem, 2400 bps with a 2400 bps modem,
The remote modem might be an older 2400 bps
modem that does not support error control.
Disable error control with the following
command: AT&M0<Enter> and try connecting
again. When the call is finished, reset the
modem: ATZ<Enter>.
During data transfer... During data transfer...
If your screen displays random or If your screen displays random or
garbage characters, garbage characters,
Set your software to the same word
length, parity, and stop bits as the remote
modem.