Evaluation of the Possible Utilization of anti-spam Mechanisms Against spit
Voice over IP can be compared to email in a number of different aspects. Both, email and VoIP are widespread communication technologies in the internet. First of all, basic usage scenarios are described, such as hosted VoIP solution, campus VoIP solution and the role of VoIP in core networks. These scenarios are then distinguished by how they are affected by spam over internet telephony (spit).
In a comparative analysis, we evaluate well-proven countermeasures for email spam in the context of VoIP. A three-year-covering survey about email security in Germany serves as an empirical basis in order to provide facts about distribution and effectiveness of antispam measures. Blacklisting of IP addresses turns out to be effective in order to prevent spam and could be as effective for spit. White- and Greylisting can be adapted to fit VoIP. Additional techniques such as CAPTCHAs are described as well. These measures could be used to feed reputation services.
Finally, a combination of mechanisms which might make up a spit prevention system is presented.
KeywordsSession Initiation Protocol Core Network Incoming Call Email Spam Public Switch Telephone Network
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