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User Identity Alias Attribute
Solution Space
Can we use the existing attributes to solve the problem?
Class
The content of class attribute is intended to be opaque; known and interpreted by the home network

UserName(1) Rewrite
UserName(1) value could be rewritten by the intermediaries

Subsequent accounting request may fail to route through the intermediary exchanges due to the lack of decoration knowledge by the home network

Proposed User Identity Alias Attribute
Avoids overloading the original purpose of UserName (1)
Eliminates the routing issues due to NAI decoration

PPT Version