“a presence based multimedia call screening service” egil c. Østhus, now with tandberg lill...

“A presence based multimedia call screening service”

Egil C. Østhus, now with TANDBERGLill Kristiansen, Dept of Telematics, NTNU

Outline Motivation PreMuMex – The architecture Advantages Challenges Future work

MATA05Norwegian University of Technology and ScienceDepartment 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

MATA05Norwegian University of Technology and ScienceDepartment of Telematics

PreMuMex – The architecture

MATA05Norwegian University of Technology and ScienceDepartment of Telematics

PreMuMex – The architecture

MATA05Norwegian University of Technology and ScienceDepartment of Telematics

PreMuMex – The architecture

MATA05Norwegian University of Technology and ScienceDepartment of Telematics

PreMuMex – The architecture

MATA05Norwegian University of Technology and ScienceDepartment of Telematics

PreMuMex – The architecture

MATA05Norwegian University of Technology and ScienceDepartment of Telematics

PreMuMex – The architecture

MATA05Norwegian University of Technology and ScienceDepartment of Telematics

PreMuMex – The architecture

MATA05Norwegian University of Technology and ScienceDepartment 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

MATA05Norwegian University of Technology and ScienceDepartment 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

MATA05Norwegian University of Technology and ScienceDepartment 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?

MATA05Norwegian University of Technology and ScienceDepartment of Telematics