*NOTE* If you refuse any permissions to the app, the app will not work properly.
Permission to use Camera
The app will use your device's camera to scan the QR code, to make it easier to register the device.
Permission to View Contacts
The app asks to access your contacts so that your device's contact list will populate within the app's contact list. This will make it easier to place a call, and will help the app recognize the person calling you when you are receiving an inbound call.
Permission to access the microphone
The app needs to access the microphone so that when you speak, the audio will be received by the other party on your phone call.