Joffrey Czarny and Sandro Gauci will be giving a workshop about VOIP security. Content of the Workshop: The Goal of this workshop is to learn the risks and the weaknesses of default deployments of VoIP and the threaths posed by the misconfiguration of some telephony features. The workshop will provide specific guidelines and advice on how to build a secured VoIP architecture. An example of this is the use of SRTP combined to DIA/ARP guard as one of the ways to block wiretapping... Several of such features will be presented and discussed during the workshop. Some comparative information will be presented about the security aspects of different voice vendors like Alcatel, Nortel, Cisco and Asterisk.