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you can’t change the com port where the modem is located in the WinFax setup, this setting only tells WinFax which modem to use.

To change the com port of the modem, you need to do this in Windows control panel settings for the modem.

Usually, it is recommended to use Com3 as the port if no other device is using this port. Once this is setup, you can then select Com3 or TAPI in WinFax.