Open Source - Asterisk Presence States

Presence State reflects the current state of the user of the device. Presence states available within Asterisk are as follows:

• not_set: No presence state has been set for this entity.

• unavailable: This entity is present but currently unavailable for communications.

• available: This entity is available for communications.

• away: This entity is not present and is unable to communicate.

• xa: This entity is not present and is not expected to return for a while.

• chat: This entity is available to communicate but would rather use instant messaging rather than speaking.

• dnd: This entity does not wish to be disturbed.

In addition to the basic presence states provided, presence also has the concept of a subtype and a message.
The Subtype is a brief method of describing the nature of the state. For instance, a subtype for the away status might be "at home".
The message is a longer explanation of the current presence state. Using the same away example as before, the message may be "Sick at home. Out until tomorrow".