Helmut Celina, mathematician of the computing center at the University of Würzburg created quite a stir with a presentation he gave at the 50th conference of the DFN (Deutsches Forschungsnetz), Germany’s national research and education network, in March 2009. Its suc- cinct title: “VoIP on the Basis of Open Source at the Uni- versity of Würzburg. ” This rather sober-sounding heading, though, was backed up by what was, for the open source co

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