Multiple uses of MS-ISAs can be combined at one time by daisy-chaining use of the MS-ISAs. Services and subscribers terminated on the LNS ISA are full supported by Application Assurance per AA subscriber and service capabilities, and by the full NAT capabilities.
When Application Assurance and NAT are used in combination (for both ESM and SAP service contexts):
AA is always on subscriber of NAT to be able to see the original (inside) subscriber IP tuple (IP + port numbers).
AA subscriber ID includes the VRF context from the service, so shared or private subscriber IP as seen in Layer-2 Aware NAT is compatible with AA subscriber contexts.