First, you will want to make sure that your click to dial is set up in your Crelate. You can find the how to article here: Set your phone protocol
To set your Tel, Call To, and Votel default on your PC (Mac Steps below), you can go to Settings> Apps and then select Default apps. From there, you will want to scroll down and find Choose default apps by protocol.
From there you will want Scroll through and find TEL URL:TEL Protocol column and select your +Choose a default and choose your preferred default app.
For MAC users, FaceTime> Preferences and you can change your default for calls program.