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ENUM and Presence draft-ietf-enum-pres-00 defines an enumservice for presence “E2U+pres” The exact presence protocol that is used (XMPP, SIMPLE, etc) is negotiated See the IMPP specs Presence for PSTN telephones requires further explication (PIDF extension) What are the states/dispositions of a PSTN phone? Geographical location as a form of presence |