Figure 3: Custom Presence Status; Figure 4 : Extensions Presence Status - Grandstream Networks UCM6 Series Manual

The default status among the listed ones above is 'Available', changing it will generate a NOTIFY message
that will be sent to all the subscribed presence watchers.
Users can also set a new custom state under the "Custom Presence Status" tab, following figure shows
a new custom presence status named "InMeeting":

Figure 3: Custom Presence Status

To simplify the status viewing, a new column was added to the main Extensions page, listing all the
extensions Presence Statuses, as displayed in the following figure:

Figure 4 : Extensions Presence Status

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SIP Presence Guide