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Content for TS 23.141 Word version: 18.0.0

1… 5… A…

5.1 Presence Server 5.2 Presence Agent Elements 5.3 Presence Proxies 5.4 Watcher Applications 5.5 Presence List Server 6.1 Presence Attributes 6.2 Presence Information Model

5 Functional Entities To Support Presence Service p. 13

5.1 Presence Server p. 13

5.2 Presence Agent Elements p. 14

5.2.1 Presence User Agent p. 14

5.2.1.1 Relationship of Presence User Agent with IMS entities p. 15

5.2.2 Presence Network Agent p. 16

5.2.2.0 General p. 16

5.2.2.1 Functions of the Presence Network Agent p. 16

5.2.2.2 Suppliers of Presence Information p. 17

5.2.2.3 Relationship of Presence Network Agent with IMS entities p. 17

5.2.3 Presence External Agent p. 18

5.3 Presence Proxies p. 18

5.3.1 Presence Proxies introduction p. 18

5.3.2 Watcher Presence Proxy p. 18

5.3.3 Presentity Presence Proxy p. 18

5.3.4 Relationship of Presence Proxies with IMS entities p. 19

5.4 Watcher Applications p. 20

5.4.1 Communication between Watcher and Presentity Proxy p. 20

5.4.2 Watcher application in an IMS UE p. 20

5.4.3 Network based Watcher Application Server p. 20

5.4.4 Watcher application located in the external Internet p. 20

5.4.5 Presence Server located in the external Internet, Watcher application located in the IMS p. 21

5.5 Presence List Server p. 21

6 Presence attributes p. 21

6.1 Presence Attributes p. 21

6.1.1 Subscriber Presence Attributes and Values p. 21

6.1.2 Presence Structure to Support Multiple Values for Attributes p. 22

6.2 Presence Information Model p. 22

7 Subscription authorisation policies p. 23

8 Charging requirement p. 24