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If you want to use a Snom Phone with DIAL|IT you must install a 3 Party Tapi Driver on Your PC to enable your PC to talk with the Snom Phone.
You can download the Snom Driver from Xtelsio this must be installed and configured, as soon this is done, you can check with the program Phone.exe if you can make inbound and outbound calls.
As soon you can make Inbound and Outbound Phone calls with the Phone.exe, you can open the config in DIAL|IT and select the Snom Driver.