 RFC 4787 attempts to alleviate confusion by introducing standardized terminology for observed behaviors.For the first bullet in each row of the above table, the RFC would characterize Full-Cone, Restricted-Cone, and Port-Restricted Cone NATs as having an "Endpoint-Independent Mapping", whereas it would characterize a Symmetric NAT as having an "Address- and Port-Dependent Mapping".For the second bullet in each row of the above table, RFC 4787 would also label Full-Cone NAT as having an "Endpoint-Independent Filtering", Restricted-Cone NAT as having an "Address-Dependent Filtering", Port-Restricted Cone NAT as having an "Address and Port-Dependent Filtering", and Symmetric NAT as having either an "Address-Dependent Filtering" or "Address and Port-Dependent Filtering".