Research on VoIP traffic detection

VoIP usage is rapidly growing due to its cost effectiveness, dramatic functionality over the traditional telephone network and its compatibility with public switched telephone network (PSTN). Internet service providers (ISPs) and telecommunication authorities are interested in detecting commercial usage of VoIP to either block or prioritize it. In this paper we propose taxonomy of existing VoIP detection techniques. Basic 4 types of techniques are used to detect VoIP traffic i.e. Port-based techniques, signature-based techniques, pattern-based techniques, and statistical analysis-based techniques. This paper mainly focuses on the basic methodology, usage, advantages and disadvantages, and comparative study of these techniques.