1. “A presence based multimedia call screening service” Egil C. Østhus, now with TANDBERG Lill Kristiansen, Dept of Telematics, NTNU

2. Outline  Motivation  PreMuMex – The architecture  Advantages  Challenges  Future work MATA05 Norwegian University of Technology and Science Department of Telematics

3. Motivation  More powerful endpoints Phone is a computer  Add context awareness to the call setup  Provide rejected callers with rich feedback  How to implement in SIP MATA05 Norwegian University of Technology and Science Department of Telematics

4. PreMuMex – The architecture MATA05 Norwegian University of Technology and Science Department of Telematics

5. PreMuMex – The architecture MATA05 Norwegian University of Technology and Science Department of Telematics

6. PreMuMex – The architecture MATA05 Norwegian University of Technology and Science Department of Telematics

7. PreMuMex – The architecture MATA05 Norwegian University of Technology and Science Department of Telematics

8. PreMuMex – The architecture MATA05 Norwegian University of Technology and Science Department of Telematics

9. PreMuMex – The architecture MATA05 Norwegian University of Technology and Science Department of Telematics

10. PreMuMex – The architecture MATA05 Norwegian University of Technology and Science Department of Telematics

11. Advantages  Intelligent policy based call screening is possible Calendar data System status Personal presence Could be extended with other parameters  Dynamic failure response More info than the POTS “unavailable tone” Different response to different callers Response could include Click-to-dial or similar technologies MATA05 Norwegian University of Technology and Science Department of Telematics

12. Challenges  Support of REFER SIP extension, not mandatory to support  Accessing the collaboration data Control unit and collaboration server likely to be in different business domains A trust relationship is needed between the calendar data provider and the sip proxy provider MATA05 Norwegian University of Technology and Science Department of Telematics

13. Future work  New security issues is introduced Potential DoS attacks Should be studied in greater detail  Privacy issues To what extend does the average Joe what to reveal his context information? MATA05 Norwegian University of Technology and Science Department of Telematics