Compaq Armada V300 Series Reference Manual page 85

The internal modem supports a subset of the countries listed
in the Dialing Properties. If you select an unsupported country, a
warning will appear and USA will be selected if you don't choose
a different supported country.
You can confirm your country selection if running
Windows 95, Windows 98, or Windows NT 4.0:
Click StartÆSettingsÆControl PanelÆModemsÆDialing
PropertiesÆand then view your country in the "I am in:" drop-
down box.
If you are traveling, you can change your country selection if
running Windows 95, Windows 98, or Windows NT 4.0:
Click StartÆSettingsÆControl PanelÆModemsÆDialing
PropertiesÆand then selecting your new country in the "I am in:"
drop-down box.
For proper modem operation and to ensure compliance with
local regulatory requirements when traveling, change your modem
country selection whenever you operate your modem in a different
country.
If you experience connection problems while using the modem
outside your home country, the following suggestions may help.
Check the telephone line type—the modem requires an
analog, not a digital, telephone line. A telephone line
described as a data line, fax machine line, modem line, or
standard telephone line, is probably an analog line.
Check for pulse or tone dialing—Dial a few digits on the
telephone and listen for clicks (pulses) or tones. Then set your
communication software to the corresponding dialing mode
(pulse or tone).
Check the telephone number you are dialing and the
response of the remote modem—Dial the telephone number
on the telephone, wait for the remote modem to answer, then
hang up.