code: def ip_addresses(self):
          
          if self._ip_addresses is None:
              self._ip_addresses = IpAddressList(
                  self._version,
                  account_sid=self._solution['account_sid'],
                  ip_access_control_list_sid=self._solution['sid'],
              )
          return self._ip_addresses
docs: Access the ip_addresses
  
          :returns: twilio.rest.api.v2010.account.sip.ip_access_control_list.ip_address.IpAddressList
          :rtype: twilio.rest.api.v2010.account.sip.ip_access_control_list.ip_address.IpAddressList