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View of ENUM "Electronic Business Card" – Calling Party Control ENUM subscriber (recipient) offers all his contacts ENUM User (originator) selects application ENUM entries may raise privacy issues Personal User Agent – Called Party Control The ENUM subscriber offers only one pointer to a "Service Resolution Service" (e.g. SIP, H323) Application or service selection is done by negotiation with the PUA of the recipient ENUM entires may expose no private data ENUM as Number Translation Database Infrastructure ENUM for Number Portability and other IN-services Routing Numbers, PSTN-Numbers, Gateways, Proxy Server, Gatekeeper |