Hi,
Directly from Windows XP help and support center:
To specify numbers to dial an outside line:
1) Open Phone and Modem Options in Control Panel.
2) On the Dialing Rules tab, click the location to modify, and then click
Edit. To create a new location, click New.
3) On the General tab, in Dialing rules, enter the numbers required to reach
an outside line for local and long-distance calls.
Notes:
To open a Control Panel item, click Start, click Control Panel, and then
click the appropriate icon.
Do not use this procedure to specify the numbers required before dialing to
a different city, area, or country/region, such as 1, 0, 00, or 011. The
numbers specified here are to dial local or long distance calls from within
a private branch exchange (PBX), such as used by a company or other
organization. The dialing rules for a location automatically insert the
number required to call a number with a different city, area, or
country/region code.
--
Anando
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