AVM FRITZ! Binding - incoming internal call from door station?

My goal is to get the status of internal calls in OH to get a notification about Akuvox door station (R26p).
The Akuvox button is triggering an internal call to my Fritz Fon over Fritz Box 5530.

Unfortunately the internal call is not showing in channel “incoming_call”.
Anyone knows a possible solution?

(Btw: The station is supporting simple Calls to HTTP URL as well. But I thought it’s possible the simplest way to get notified over Fritz)


As it seems not to be supported by call monitor at the openhab end the binding cannot support it.
Topic also was raised here: Fritzbox-Binding - show internal calls?