I am not always near my ipad/phone and would like to be alerted to incoming facetime calls through my whole house speaker system. Is there any way to detect an incoming facetime call?
Not currently. The only way to leverage actions that occur on your phone/ipad is to create a shortcut (in the shortcuts app) on that device. Unfortunately, creating a shortcut that’s triggered by an incoming call is not possible.
How about monitoring the network traffic?