code: def origination_urls(self):
          
          if self._origination_urls is None:
              self._origination_urls = OriginationUrlList(self._version, trunk_sid=self._solution['sid'], )
          return self._origination_urls
docs: Access the origination_urls
  
          :returns: twilio.rest.trunking.v1.trunk.origination_url.OriginationUrlList
          :rtype: twilio.rest.trunking.v1.trunk.origination_url.OriginationUrlList