code: def trunking(self):
          
          if self._trunking is None:
              from twilio.rest.trunking import Trunking
              self._trunking = Trunking(self)
          return self._trunking
docs: Access the Trunking Twilio Domain
  
          :returns: Trunking Twilio Domain
          :rtype: twilio.rest.trunking.Trunking