I'm using this app with a private network, and it works flawlessly. But there is one behavior I wish I could change, and I haven't figured out how: The app keeps resetting the audio to speaker on every call. I always use a Bluetooth headset, and if I select it, it works -- for THAT call. I have to keep selecting it, and it's a bother. I'd like to set the Bluetooth as the default, and stay that way until I change it. I need that to give 5 stars. I've searched and can't find it.