Fax Voip T38 Fax & Voice - Fax and Answering Machine for your SIP/H.323/ISDN CAPI 2.0 line. Voice Fax Modem for standard Fax & Voice software. Multiple SIP Registrations. Call Routing. Color faxes. T.38, audio and CAPI fax. Fax Voip Virtual Printer. Incoming Fax Routing: Route through E-mail, Store in Folder, Print. Fax-On-Demand. Fully-functional system for sending faxes via e-mail (Mail to Fax) and for receiving faxes to e-mail (Fax to Mail).