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, check that T.38 fax option is selected.
Configure Incoming Call Routing
On the Fax page, in the Fax Support area, check that T.38 fax option is selected.