You can send a fax using the SendFax.exe command line utility, which is included in the Fax Voip T.38 Console software and allows you to automatically create a fax job and place it in the Outbox folder in the Fax Voip T.38 Console, see more details in the Send a Fax using SendFax.exe tool chapter of this user manual.
For more information about SendFax.exe command line options, see SendFax.exe command line options.
Also, you have a useful visual tool that allows you to easily configure SendFax.exe command line options and then run SendFax.exe directly from the Fax Voip T.38 Console Control Panel, see To Configure and Run SendFax.exe using Fax Voip T.38 Console Control Panel.