message: Don't blindly hangup on a call error.
  Not all errors means we want to send a hangup (in fact most don't,
  but the most notable being when we fail to answer a call: we should
  not then automatically reject it).
diff: @@ -117,7 +117,6 @@ function _setCallListeners(call) {
  call.on("error", function(err) {
  console.error("Call error: %s", err);
  console.error(err.stack);
  - call.hangup();
  _setCallState(undefined, call.roomId, "ended");
  if (err.code === 'unknown_devices') {
  const QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");
  