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Use case #2: 3G I-WLAN 3GPP AAA Proxy 3GPP AAA Proxy 3GPP AAA Proxy Wd interface is a diameter cloud which typically has relays For each sessions, Wd can use any available 3GPP AAA Proxy Problem: 3GPP AAA Server messages (Home to visited) for a session needs to pass through the same 3GPP AAA proxy in the visited network Problem: Current 3GPP scheme uses decorated NAI in the User-Name to define a type of source routing |