I use my F900bt all the time as i am a sales person. the only problem I have is when i have loded a route and the avic is doing its navigation everything is fine until a phone call comes in on the bluetooth. As soon as the phone call comes in the unit mutes all audio including the navigation promts. I used to use a D3 and it had a area in settings that would allow you to tell it haow and when it would mute audio. The new 920 has the feature back in the settings menu. Is there any way to add that feature in to a F900? Any help would be greatly appreciated. Thanks in advance!