Default Problems with HFP (Blitzer.de App)

Hi,

just switched from CM11 to OMNI.

I'm really happy with OMNI apart from that, that I have problems with the Blitzer.de app. The notifications are not transmitted with the HFP. Sometimes I get an incoming call (in my headunit) - normally then the noticfication comes up, but just silence. The "call" is not beeing canceled automatically. If this happens, I can use the "test" button in the app, then the notification is working properly. Very strange behaviour.

I'm not sure if this is really related to the OMNI project, but I can't imagine what I have done wrong.