Dialling with Telephony Hardware
    This help topic is only for users who want to dial out using dedicated telephony hardware.
     
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Top   Using Windows Telephony (TAPI)
  If your hardware is compatible with Windows Telephony it will appear in the Via drop-list.

If your hardware is not listed, it is because Windows could not find a TAPI driver for your hardware. Because some hardware systems have their own Windows software for dialling and managing calls, they don't install a TAPI driver (so that you are encouraged to use their software). Check the installation CD or visit the manufacturer's website for TAPI drivers.
     
  Assuming your hardware is listed, choose it from the Via drop-list.
     
  Click the Device properties button to see hardware settings