T38FAX service allows you to send and receive T.38 faxes. This service provider also offers phone numbers in the United States.

Username (or SIP-ID): the phone number provided by T38FAX

Password: password

SIP Registrar Server: sip.t38fax.com

On the General page, in the Dial on Line area, check that the following settings are used:

VOIP Protocol: SIP

Dial on SIP Server: sip.t38fax.com

Username: the phone number provided by T38FAX

When configuring your incoming rule, make sure that T.38 support option is selected.

Make sure that T.38 FAX option is enabled in the main window.