Select the TAPI device driver for incoming and outgoing calls from the list box. See details for TAPI - Where do I find the TAPI driver?
With the button a window can be opened where all functions supported by the TAPI driver will be shown.
With the driver <Telephone Simulator> CTI Data Connector Enterprise Edition can be tested with a phone simulator if no TAPI enabled phone is available.
If your TAPI driver is not listed here see: I cannot select my TAPI driver in the configuration wizard
See also
Where do I find this screen?
System Requirements- TAPI driver
Where do I find the TAPI driver?