In general, it is assumed that each device or network equipment has a PANA protocol stack available for use by other modules within the device or network equipment.When a PAA device interacts with the backend authentication server using a AAA protocol, its SME may also provide an interface to the AAA protocol to obtain authorization parameters such as the authorization lifetime and additional filtering parameters.For the PAA, the SME-PANA interface should also provide a method for communicating filtering parameters to the Enforcement Point(s) when cryptographic filtering is used.