Not USB Internet Phone, but it shows up as USB Audio Device...working properly. Using Windows sound recorder (sndrec32.exe) and as you suggested, opening sndvol32.exe, the device Handset came up in the control. Ticking record shows an entry named Unknown, selected it and turned the volume up - hit record and the dial tone stopped, so I said "Watson come here" in the handset and could see it recording. Pushed play expecting to hear it through the comps speakers, duh...yes, it played back fine in the handset. So it would appear the drivers can handle it, but (as you probably know) without the program you can't dial.