Security analysis and countermeasures assessment against spit attacks on VoIP systems

Spam over Internet Telephony is becoming a large problem of the Voice over IP Architectures. Voice over IP has become a valid alternative to the Public Switched Telephone Network and it has a new paradigm for providing telephony services at a lower cost and higher flexibility. In the meantime, with Voice over IP the privacy becomes so hard and the benefits introduced are as strong as the security problems, like Spam over Internet Telephony. People have more attention on the spam voice issue, because of the great danger of this threat. Thus, in this paper we want to propose and introduce a new protection model against Spam over Internet Telephony attack, through a user-profile framework. This framework allows to identify the optimal counter-measures to be taken against this threat, according to the user assessment, that receives a certain number of calls during an observation period. We define general profiles based on certain parameters, and with a user-profile matching we can identifies the best security path which must be applied.