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INTRODUCTION 
The UCM6XXX is now offering the ability to subscribe to extensions state, and to be informed about the 
current presence status of a coworker phone extension. So far, the users can use the BLF (Busy Lamp 
Field) to check the phone communication state, and will be advertised of every state change (Idle / Ringing 
/ Connected), the added value of SIP Presence is to keep the user advertised on the monitored extension’s 
current general state as well (Available / Busy / DND …). 
 
SIP Presence is one of the new added features on the UCM6XXX series, allowing a user to publish his/her 
presence state, this state can be predefined and known state (Available / Busy / Unavailable ..), or a custom 
state that can take any format, and can be customized by the user. The monitoring extension can subscribe 
to the presence status and be updated about any status change. 
 
This guide describes the utility and steps for configuring the SIP Presence on UCM6xxx, as a main feature 
when the user wants to be informed about other extensions’ status.