CUCM Presence Vs CUPS Presence

Unified Presence
In Cisco Unified Communicator Manager (CUCM ) , Users can check the status of another phone via what is known as "Phone Presence" i.e status of phone/line DN being in either ON HOOK state, OFF HOOK state ,¬† DO NOT DISTURB state etc.This feature in CUCM is called BLF (Busy Lamp Field).BLF displays the real-time status of another phone device "phone presence" information". There are couple of ways BLF status can be seen in CUCM: BLF Speed Dial : BLF SD is two-fold feature.First,you can press SD button to call another Speed Dial extension and also, you can see "phone presence" status of SD user's extension. BLF Call Lists¬† : Using BLF Call Lists Feature,which is actually configured at Enterprise Parameter Level, you can monitor "phone presence" status via Missed…
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Understanding & Configuring Presence Service in Cisco Unified CME

Unified Presence
A presence service is a system for finding,retrieving, and distributing presence information from a source, called a presence entity (presentity), to an interested party called a watcher.Presence Service enables the calling party to know before dialing whether the called party is available.Presence features uses SIP SUBSCRIBE and NOTIFY methods to allow users and applications to subscribe to changes in the line status of phones in a Cisco Unified CME .Phones act as watchers and a presentity is identified by a directory number on a phone. SIP phones and trunks use SIP messages for presence information; SCCP phones use presence primitives in SCCP messages.SIP/SCCP phones can subscribe to Busy Lamp Field (BLF) speed-dial notification as well as BLF for directory call lists for missed calls, placed calls, and received calls. Here…
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