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ENUM and Presence In the IETF, quite a bit of existing work has been done on sharing presence information Roughly, presence information is real-time data about the disposition of a party, usually regarding their disposition to communicate Most common example today is in commercial instant messaging systems (“idle”, “away”, etc) Presence as a using protocol provides a framework for managing the periodic transmission of location information Operations for subscription, notification, unsubscription Concept that presence information is sent periodically to a subscriber (a “watcher”) as it changes RFC2778/RFC2779 define a framework and requirements for presence draft-ietf-impp-cpp-02 defines a “pres” URI scheme for presence |