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Use case #1: TISPAN NASS
UAAF
UAAF
UAAF
UAAF
UAAF
UAAF
E5 interface is a diameter cloud which typically has relays
For each sessions, a3 can use any available UAAF
Problem: Server messages (Home to visited) for a session
needs to pass through the same UAAF in the visited network
PPT Version