Your modem manual should contain a list of all of the commands that your modem understands. These commands are also called Initialisation Strings. Check with your computer vendor for more advice on modem initialisation strings.
The following commands can be entered in capitals or in lowercase. More than one command can be combined to form a modem string (e.g. AT&F1M0X3).
AT&F - Resets the modem to the default factory settings.
AT&F1 -Resets the modem to the secondary default factory settings.
L0 - Sets the modem speaker to the lowest volume.
L1 - Sets the modem speaker to a low volume.
L2 - Sets the modem speaker to a high volume.
L3 - Sets the modem speaker to the highest volume.
M0 - Turns the modem speaker off completely.
M1 - Turns the modem speaker on.
S11=x where "x" = 50 to 255 - Sets the dialing speed of the modem (lower is faster).
W2 - Allows Windows to report your true connection speed.
X2 - The modem will check for a dial tone before it starts dialing.
X3 - The modem will not check for a dial tone before it starts dialing.
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.
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