def _send_message(self, message, callback=None, errback=None): content_type = message.content_type[0] ack = msnp.MessageAcknowledgement.HALF if content_type in ("text/x-msnmsgr-datacast", "text/x-msmsgscontrol"): ack = msnp.MessageAcknowledgement.NONE SwitchboardHandler._send_message(self, message, ack, callback=callback, errback=errback)