Zoom Contact Center as Default ClickToCall

[afeit]

We have just licensed ZCC and do quite a bit of outbound calling. We use Windows machines and cannot get the click to call to default to calling via ZCC rather than Zoom phone.  Can anyone tell me exactly which registry item needs to be changed to handle this?  Or does anyone have another way to set the callto: default app as zoom contact center rather than zoom phone?  Without this capability, it is very cumbersome to call out - need to click + next to new outbound engagement>New Voice Call and then copy and paste/enter the number. This used to be a one click process for folks with zoom phone.  Any assistance is greatly appreciated!