Hello Fabio,
Offcourse you can disable incomming call popup by calling InternalCallHandler=1 and check incomming call in state events and generate your own triggers/events on incomming calls.
For example:-
iaxcontrol1.InternalCallHandler=1 //to disable incomming call handler
iaxcontrol1.InternalCallHandler=0 //to enable incomming call handler
I m sorry for the lack of documentation. but i m posting all available variables, methods and events in the control in separate post
Regards,
Babar Shafiq Nazmi.