Re: Bluetooth answer/disconnect button, dbus help
 

I don't think it has been solved, once everything is replaced with OSS for the Neo900 perhaps?

Re: Bluetooth answer/disconnect button, dbus help
 

Ok, after several hours of digging, I found you can edit /etc/bluetooth/audio.conf and change the line "HFP=true" to "HFP=false". Then dbus will emit the AnswerRequested signal when the headset button is pressed.
Side note: This also works on the N9 and the Jolla.