Science and Development Network (SciDev.Net)
VoIP (Voice over Internet Protocol) services can be abused by spammers who send out commercial messages in bulk due to their cost saving effects. However, an effort to prevent spam has hardly been made in implementing VoIP system, so that a spam reporting system that collects various types of VoIP spam and makes use of them to impose legal sanctions or to improve spam filtering techniques has not yet been developed. In this paper, the authors propose a VoIP spam reporting system by extending an existing spam reporting system of mobile phones. They design a message format for reporting VoIP spam by analyzing CDR (Call Detailed Records) that can be obtained from VoIP devices and propose various paths which connect VoIP phones to spam reporting servers.