public function updateMapping(Mapping $newMapping = NULL)
    {
        $mapping = empty($newMapping) ? $this->_order->getMapData() : $newMapping;
        $this->call('updatemapping', array(
            "customer_id" => $this->_order->getCustomerId(),
            "did_number" => $this->getDIDNumber(),
            "map_data" => $mapping->toArray()
        ));
        $this->_order->setMapData($newMapping);
        return true;
    }