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

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

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

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

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

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

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

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

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

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

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

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

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