Android : Android SIP no incoming call event (doubango)

I've been trying to integrate Doubango Sip Stack.

First of all I've tried to go with the manual and test call example.

But I'm not recieving ACTION_INVITE event in my broadcast reciever, although I've added all filters etc. I get registration event without any issues.

At last I've checked out IMSDroid architecture and did the same - NativeService and Engine, extending ngn classes. Added service to manifest etc.

But i'm still not getting incoming call event, although I'm getting registration events.

What am I doing wrong here? And what is the approach?

p.s. my code looks pretty much like the one listed here at the bottom: http://kehers.github.io/2014/06/04/sip-on-android.html (see doubango example)