code: def _response(self, pdu):
          
          if _debug: UDPDirector._debug("_response %r", pdu)
  
          # get the destination
          addr = pdu.pduSource
  
          # get the peer
          peer = self.peers.get(addr, None)
          if not peer:
              peer = self.actorClass(self, addr)
  
          # send the message
          peer.response(pdu)
docs: Incoming datagrams are routed through an actor.