Compaq Armada M300 Series Reference Manual page 88

Set the modem to ignore dial tones—If the modem receives a dial tone
it does not recognize, it will not dial and will display a No Dial Tone
error message. To set the modem to ignore all dial tones before dialing:
1. Select StartÅSettingsÅControl PanelÅModems.
2. Select your modem, then select PropertiesÅConnections tab, then
clear the Wait for Dial Tone Before Dialing check box.
NOTE: If you have a 3Com modem (see "Selecting a Country-Specific
Modem Configuration," above) and continue to receive the No Dial Tone error
message after clearing the checkbox, select StartÅ ProgramsÅCompaq
ModemÅWorldPort. Select USA, then again clear the Wait for Dial Tone Before
Dialing check box.
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