Date Added: Jan 2012
A threat of VoIP spam is becoming more and more actualized with the growth of VoIP service. Currently, most spammers send spam through internet telephony because they are possible to send spam in bulk and cheaply. Also, they could detour the most effective techniques currently in use for countering e-mail spam due to VoIP characteristics. RBL is one of the useful techniques to prevent e-mail spam and it also could be used to prevent VoIP spam. It is important to consider the attributes of VoIP call for adopting RBL in VoIP. This paper proposes a novel technique using RBL with six factors to calculate the spam score for countering VoIP spam.