Nothing extremely urgent but extremely interesting: The BSI (Bundesamt für Sicherheit in der Informationstechnik, Germany) published a study about VoIP security: http://downloads.bsi-fuer-buerger.de/literat/studien/VoIP/voipsec.pdf (I appologize - in German only). It is about 11MB and 146 pages but interesting to read
Roger
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