Fixing thresholds to detect Spam over IP telephony attacks

Spam over IP telephony (SPIT) is expected to become a serious problem as the use of voice
over IP (VoIP) grows. This kind of spam is appreciated by spammers due to its effectiveness and low cost.
Many anti-SPIT solutions are applied to resolve this problem but there are still limited in some cases. We
propose in this paper an effective SPIT detection method based on user’s call behavior.