How do I set up Fax to work with long distance calling cards?
You can create a new dialing rule for your calling card from the Send Fax Wizard ->Dialing Rules. In the Dialing Rules dialog, select New and select the calling card tab and enter the required calling card details. If your Calling card settings are part of the per-user settings, you are out of luck with Windows XP Fax. The XP Fax Service can only run under the System account, so per-user settings are not available to it.
