CallKit - Declining incoming call from system UI

Hi!

I have a doubt regarding the behavior of CallKit, when my app is in the background and it registers an incoming call to CallKit.

The system calling interface is presented and, if the user accepts the call, my app is brought to foreground and it can then handle the call from there.
On the other side, if the user declines the call my app's UI is not shown.

Is this an implicit behavior of the framework itself and not configurable? Or am I missing something?
I see no custom code from the app's side that decides those behaviors.

Our intention is to display an specific View from the app, when the user chooses to decline. I've seen that we could be notified of the rejection by the CXEndCallAction using the CXProviderDelegate; but I didn't figure out a way to bring the app UI foreground from there (not even know if it's possible)

Any information is appreciated, thanks in advance!
CallKit - Declining incoming call from system UI
 
 
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