1. 1 Presence Architecture and Flow Diagrams Date-1 st Nov 2005

2. 2 Presence Cross domain (wireless, PSTN, VoIP as presence sources) Cross federation (multiple administrative domains) Interaction of different components ( PA, UA, XCAP Server, Resource List Server) Basic presence block diagram Presence server data processing Presence data management of user having identities in multiple domains.

3. 3 Cross-domain presence SIP NOTIFY SIP SUBSCRIBE Presence Server Presence Database Presence Server Watchers/Buddies for one presentity Presence Server Watchers/Buddies for one presentity PSTN SCP Wireless Network SIP PUBLISH Broadband IP Network (VoIP, Internet) SIP Phone TV IM

4. 4 Inter-domain presence: Cross federation Logical sub-domain: cs.columbia.edu external-domain.com Presence Agent pa.columbia.edu Presence Agent pa.cs.columbia.edu Branch Office I Presence Agent pa.campus1.columbia.edu SIP Proxy Server SUBSCRIBE NOTIFY SUBSCRIBE NOTIFY PUBLISH Logical and actual flow of messages being shown to domains that are logically or physically separated from an external domain. Presentities in different logical and physical sub domains

5. 5 Interaction between different presence protocols XCAP Server PUBLISH [presence] Auth Policy, Resource List SUBSCRIBE [presence] Buddy List Update, Policy Update, Authorization. Watcher NOTIFY [presence] SUBSCRIBE [Watcher-Info] REGISTER SIP Proxy/ Registrar SUBSCRIBE [reg] NOTIFY [reg] Presence Agent (resource-list, composition, Filtering etc. NOTIFY [Watcher-Info] Presentity

6. 6 Basic block diagram PUBLISH NOTIFY REGISTER SIP Proxy/ Registrar presence agent SUBSCRIBE NOTIFY Watcher NOTIFY Presentity

7. 7 Presence server data processing Presence Sources PSTN Phone, Cell Phone, VOIP Client Presence Authorization Presentity specified filter NOTIFY candidate presence document privacy filtering Watcher Filter Composition Policy SUBSCRIBE specifies watcher filter Watchers PUBLISH NOTIFY final presence document Post Processing Composition candidate presence document filtered presence document

8. 8 Presence data management for a user having identities in multiple domain SUBSCRIBE sip:alice@xyz.com alice@yahoo.com DB SUBSCRIBE pres:alice@yahoo NOTIFY pres:alice@yahoo PUBLISH sip:alice NOTIFY sip:alice@xyz.com REGISTER sip:alice Presence Server Yahoo Server Alice’s Wireline Phone Alice’s Cell Phone