The Lexmark MX611de has been certified to work with T38Fax.com. The SIP/T.38 settings are as follows: Fax Transport: T.38 STUN Server: Stun Server of your choice Proxy: sip.t38fax.com;transport=udp Registrar: ${SIPProxy} User: YOUR_DID Password: YOUR_PASSWORD Contact: <sip:${...

Toshiba's line of IP Fax-capable e-STUDIO fax machines can send faxes natively using the T.38 protocol, so no traditional phone wiring or analog gateway is necessary. Pictured is a Toshiba e-STUDIO2510AC. Related Links: Manufacturer's Website IP Fax Operator's Manual Contact your MFP service techni...