Configure Fax Voip T.38 Modem with Callcentric

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callcentric.com is a popular SIP provider in the United States. Callcentric supports both T.38 and audio faxes. This service provider also offers phone numbers in the US/Canada and many other countries. To get an account you can register at the Callcentric website.



Configure SIP account



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

Password: password

SIP Registrar Server: callcentric.com



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: callcentric.com

Username: the phone number provided by the Callcentric



On the Fax page, in the Fax Support area, make sure that Send T.38 re-invite option is selected.




Configure Incoming Call Routing


On the Fax page, in the Fax Support area, make sure that T.38 fax option is selected.