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VoIP has become a core Internet service, slowly replacing
traditional circuit-switched telephony for both residential and enterprise use.
However, most of the commercial systems focus on
replicating century-old models and services, rather than leveraging the
opportunities offered by an Internet-based service. In this talk, I will
describe the core principles of VoIP and how VoIP can be enhanced to provide
more user control over reachability, more flexible services and transparent
mobility.