Fax Voip T.38 Modem can operate as a Windows Service. This option is not installed by default, so you should make the appropriate settings manually. Before using this option, we recommend that you verify the correct operation of Fax Voip T.38 Modem in non-service mode. Normally, when Fax Voip T.38 Modem is configured as a service, it is started under a Local System account.