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Some Definitions What is required to establish a communication? Identification of the user to the service provider e.g. a UserID, an IMSI, „private“ User Identity, etc. Provides mobility, not portable Address mapped to the current user device e.g. IP-address, E.164 number Network-specific, used for L3-routing, not portable Name related to the service e.g. URI, AoR, e-mail address, E.164 number, „public“ User Identity mapped to the current address of the device where the user has identified himself, used for application-level routing for the convenience of the calling party needs to be public portability is depending on service |