We are running 3CX Ver 12 with the latest 3CXPhone for Android. We cannot receive or place external calls via the Android. Same results if "in office" or "out of office" using 3CX tunnel. All outgoing external calls terminate on the client with the message "Call Failed, Not Acceptable". Internal (extension) calls received or initiated by the Android work fine whether in or out of office. By viewing the server log, it appears as if the Android requested the call termination. Any ideas?