PRESENCE SYSTEMS, PRESENCE SERVERS AND PRESENCE AGENTS

摘要

The invention namely provides a presence server (103) comprising: —a data repository in which is stored a plurality of user (106, 107) identities recorded in association with at least one device address and a status, —an input interface for receiving a busy or available status updating request (2) comprising an address of a calling device (201) and a called user (107) identity of a user of a called device (202), —a processing unit configured to: when the input interface receives the busy status updating request (2): —retrieve from the data repository a calling user (106) identity, —change the status associated to the calling user (106) identity into a busy status, when the input interface receives the available status updating request (7), change the status associated to the calling user identity into an available status, —an output interface to access the status of user identities.