4.3 Presence information

22.1413GPPPresence serviceStage 1TS

A logical model of a presentity’s presence information consists of an arbitrary number of elements, known as presence tuples, as depicted in figure 4. Presence information for each presentity is identified by a unique identifier.

Figure 4: Presence information

Each such presence tuples contains the following information as described in RFC 2778 [3]:

– status

Table 1: Status

Item	Explanation	Example Values
status	Indicates the current condition of the device or service represented by the presence tuple	open, closed, online, offline, busy, away, do not disturb etc.

– communication address

consists of a communication means and a contact address

Table 2: Communication address

Item	Explanation	Example Values
communication means	Information indicating a method whereby communication can take place	service type (e.g. telephony, SMS), media type (e.g. audio, video, text message), multimedia messaging service, instant messaging service etc.
contact address	Information indicating a specific point of contact via some communication means	E.164, URI, instant inbox address etc

– other presence markup

any additional presence information