External mic is not used by default for calls
As described in #131 (closed) I'm still having an issue when using a headset for calls. If I have a headset plugged in and then make a call, the audio output is correctly routed through the headset, but the input doesn't work (neither through the built in mic nor through the external microphone from the headset). This is fixed when I pull the headset out and plug it in again during the call. Right now I'm just plugging in the headset while the call is ringing to avoid confusion. I can reproduce this issue reliably, but I'm not sure if this happens also when placing a second call with the headset still plugged in after making it work for the first call.