Intrusion detection mechanisms for VoIP applications
  VoIP applications are emerging today as an important component in business and communication industry. In this paper, we address the intrusion detection and prevention in VoIP networks and describe how a conceptual solution based on the Bayes inference approach can be used to reinforce the existent security mechanisms. Our approach is based on network monitoring and analyzing of the VoIP-specific traffic. We give a detailed example on attack detection using the SIP signaling protocol. 
Mohamed El Baker Nassar (INRIA Lorraine - LORIA), Radu State (INRIA   Lorraine - LORIA), Olivier Festor (INRIA Lorraine - LORIA)