Archived from groups: comp.dcom.voice-over-ip (More info?
USB phone will require your PC being ON.
You be better of with router which has VoIP socket(s) (e.g. Draytek Vigor
2500V, 2600V or Zoom XV5) or
ATA VoIP phone adapter plugged in to a router, then use ordinary cordless
phone, regardless whether your PC is on or not.
There are also stand alone WIFI VoIP phones, like Zyxel 2000W, but alas