Notification for the callee missing

[Luthieneye]

[Luthieneye]

TODO: Pick up the call and create a notification, letting the callee know that they will be called back by the station.

[carlosmouracorreia]

I can't test this as I don't have to SIM cards at the moment. Shall we schedule a moment for this @Luthieneye ? The code is on production already though now.