1. VOIPSA, VoIP Security and Privacy Threat Taxonomy http://www.voipsa.org/Activities/taxonomy.php, October 2005.
2. D. Geneiatakis, A. Dagiouklas, G. Kambourakis, C. Lambrinoudakis, S. Gritzalis, S. Ehlert, D. Sisalem, Survey of Security Vulnerabilities in Session Initiation Protocol, IEEE Communications Surveys and Tutorials, vol. 8 (3), IEEE Press, 2006, pp. 68–81.
3. SNORT the defacto standard for intrusion detection/prevention. Available from: .
4. BRO Intrusion Detection System. Available from: www.bro-ids.org.
5. Towards principles for the design of ontologies used for knowledge sharing;Gruber,1993