Fax Software

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Make sure you have the latest Windows XP drivers for that specific fax modem (you’d have to find out from the manufacturers Web site)

if the modem is on a com port such as Com4 or higher, you might want to configure it so it is the next available com port. For internal modems, usually this is Com3. (Com1 and Com2 are usually reserved for physical 9 pin communications ports in most computers used today)

You might want to post more info on the modem and setup, since troubleshooting TAPI errors is not simple there are many scenarios that can cause these errors .