Note --- there are been a number of previous posts on this topic over the past few years but they've been closed out. This is a new post concerning connectivity with a Plantronics Voyager Legend running on an Android 4.1 platform connecting to the Android mobile app version running the 3CX 15.1 version (I hope I have the version correct.) I also believe the Bluetooth version is 4.1. I have also upgraded the Plantronics Voyager to the latest 2017 firmware update. The mobile 3CX app still doesn't recognize the "answer" button on the Voyager Legend earpiece when pressed. When I receive a call through the 3CX app I need to hit the "answer" button on the app for the earpiece to connect with the phone / application. Is there anything I can do on the application side to achieve full functionality?