At the time of installation, Fax Voip FSP always trying to automatically configure the Windows Fax Service to use Fax Voip Line devices to send and receive faxes.
To manually configure Windows Fax Service in Windows 11, Windows 10, Windows 8/8.1 or Windows 7, see To configure the Fax Service in Windows 11.
To manually configure Windows Fax Service in Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows Server 2012/2012R2 or Windows Server 2008R2, see To configure the Fax Service in Windows Server 2022.