User presence is key feature of any unified communication solution today. Based user presence that we see in the client software we known if the user we are trying to reach is Available, Busy or Out of the Office even without asking someone.
What is Presence?
Presence expresses the availability and willingness of a user to join a conversation by using a SIP client such as Microsoft Lync 2010 or Lync 2013. There are two main activities involved in presence:
Presence Publication
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