code: def settings(self):
          
          if self._settings is None:
              self._settings = SettingsList(self._version, )
          return self._settings
docs: Access the settings
  
          :returns: twilio.rest.voice.v1.dialing_permissions.settings.SettingsList
          :rtype: twilio.rest.voice.v1.dialing_permissions.settings.SettingsList