message: Log when we ignore a second call in a room
  What's more useful than a comment? A log line.
diff: @@ -802,7 +802,10 @@ export default class CallHandler extends EventEmitter {
  const mappedRoomId = CallHandler.sharedInstance().roomIdForCall(call);
  if (this.getCallForRoom(mappedRoomId)) {
  - // ignore multiple incoming calls to the same room
  + console.log(
  + "Got incoming call for room " + mappedRoomId +
  + " but there's already a call for this room: ignoring",
  + );
  return;
  }
  