babyTEL is a popular SIP provider in the United States and Canada. babyTEL supports both T.38 and audio faxes. This service provider also offers phone numbers in the US/Canada. To get an account you can register at the babyTEL website.
Configure SIP account
Username (or SIP-ID): the phone number provided by babyTEL
Password: password
SIP Registrar Server: sip.babytel.ca
Outbound Proxy: nat2.babytel.ca:5065
Configure Outgoing Call Routing
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.babytel.ca
Use Outbound Proxy: nat2.babytel.ca:5065
Username: the phone number provided by babyTEL
On the Fax page, in the Fax Support area, make sure that T.38 fax option is selected. This applies to the rule where you have From Line = <T38FAX>.
When sending a fax using Fax Voip Virtual Printer, it is recommended to choose T.38 support option in the Fax Voip T.38 Console Send Fax Wizard window.
Configure Incoming Call Routing
On the General page, in the Call To Fax Voip T.38 Console area, select Receive Faxes, and then select T.38 support option.