VoIP SPAM Response System Adopting Multi-leveled Anti-SPIT Solutions

VoIP spam will become severe problem preventing from generalization of VoIP service. For comprehensive response against spam, this paper implemented VoIP SPAM response system adopting multi-leveled anti-spam solutions. To adopt them, we divided VoIP service domains into three domains as outbound, intermediary, and inbound. The main goal of anti-spam solution in outbound domain is to prevent spam by monitoring and detecting call traffic of registered users. In intermediary domain, we focused on blocking SIP message forgery spam using SIP-based sender policy framework. Inbound domain has the “easy spam reporter”. This module enables victims to report spam contents to the administrator directly. The reported contents and information, of course, are shared with other domains as a black list. Through the experimental result, we showed this system is enough to prevent, detect, and block VoIP spam.