found this on yahoo
# Click on "Start" and "Control Panel".
# Open "Phone and Modem Options".
# Select the "Modems" tab.
# Select your Modem from the list and then click onto "Properties"
# Click onto the "Advanced" page tab.
# The "Extra Initialization Commands" box is at the bottom of this window. Click onto that box and then type in the command that you want to issue the modem.
L0 - Sets the modem speaker to the lowest volume.
Generally speaking the modem should respond to the command you've typed in on the next time you dial in using your Xtra connection. With some modems you'll need to restart your computer for the change to take affect.
If a modem does not support a given command it will report an error. In Windows this will result in an error: 630 - "The modem is not responding." If this occurs remove the command, restart the computer and power cycle the modem if it is an external modem.
# Click "OK" and "OK".
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