Android Question How to detect if an outgoing called in answered or not

Hi,

This thread shows how to detect missed incoming calls: https://www.b4x.com/android/forum/threads/detect-missed-call.27226/

However, my app works as a call back system (the app makes the call) and it needs to know if the receiver in the other ends actually takes the phone or if it just times out. How can I do that with B4A?

Regards,
Martin