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TRENDnet 56K USB Phone/Internet/Fax Mode
Works fine with phonetray 3.0 on my Windows 8.1 OS. All I had to do was plug it into a usb port and it was automatically installed. I only use it for caller ID, so I can't verify using it for an internet connection or as a fax modem.
The TRENDnet TFM-560X 56K External Data/Fax/TAM Modem provides users with the highest possible data communication rates, reliable error-free transmissions and widespread interoperability with other users. The TFM-560X also supports Group 3 fax send-and-receive functions. Free communication software and serial cable are included with the TFM-560X for quick and easy startup. TRENDnet's TFM-560X is also compatible with virtually all communication software and capable of utilizing the AT command set.