Click the number to start the call, depending on the app/device that configured Click2Call. The client opens a new window with the number already inserted. Click Call to start the call. When the browser pop-up appears, make sure you have selected the device you are using. If you don’t see 3CX as the above option, follow these steps: In Windows Search Bar, type “Default app”. Then scroll down and select Select default app by protocol Scroll down and change the TEL links to the 3CX desktop app