Usage with CUCM

Enterprise Telephony > PBX dependent features > Presence > Presence Cisco

On presence-enabled shortcuts or pages, the current presence status is notified with a dedicated colored bullet. This way, the end-user easily know if an internal phone extension (remote party) is available or not before trying to call him.

Visually, the notification on call key for the remote party is
not logged in	free	in call	Busy	Forward All	DND

An error while retrieving the presence status is notified with a red bullet :

Presence status is not available for this extension

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