SYSTEM AND METHOD FOR PROVIDING A PRESENCE SERVICE

摘要

A system and method including registering state information capable of being published by an Event Publication Agent (EPA) using a Media Feature Tag according to Session Initiation Protocol (SIP); sending a Publication Rule for target state information from a Ruler to an associated EPA; routing the Publication Rule to the EPA; receiving, by the EPA, the Publication Rule; performing publication to an Event State Compositer (ESC) according to the Publication Rule; requesting to update or cancel the Publication Rule; receiving the request from the Ruler and modifying the Publication Rule accordingly; performing publication from the EPA to the ESC according to the modified Publication Rule; sending a Publication Rule synchronization request from the Ruler to the EPA using an event package; sending a response message to the Publication Rule synchronization request from the EPA; and sending notification of further updates of the Publication Rule from the EPA.