code: def ip_access_control_list_mappings(self):
          
          if self._ip_access_control_list_mappings is None:
              self._ip_access_control_list_mappings = AuthCallsIpAccessControlListMappingList(
                  self._version,
                  account_sid=self._solution['account_sid'],
                  domain_sid=self._solution['domain_sid'],
              )
          return self._ip_access_control_list_mappings
docs: Access the ip_access_control_list_mappings
  
          :returns: twilio.rest.api.v2010.account.sip.domain.auth_types.auth_calls_mapping.auth_calls_ip_access_control_list_mapping.AuthCallsIpAccessControlListMappingList
          :rtype: twilio.rest.api.v2010.account.sip.domain.auth_types.auth_calls_mapping.auth_calls_ip_access_control_list_mapping.AuthCallsIpAccessControlListMappingList