Characteristics of Real Open SIP-Server Traffic
- Cite this paper as:
- Stanek J., Kencl L., Kuthan J. (2013) Characteristics of Real Open SIP-Server Traffic. In: Roughan M., Chang R. (eds) Passive and Active Measurement. PAM 2013. Lecture Notes in Computer Science, vol 7799. Springer, Berlin, Heidelberg
Voice-over-IP (VoIP) is currently one of the most commonly used communication options and Session Initiation Protocol (SIP) is most often used for VoIP deployment. However, there is not a lot of general knowledge about typical SIP traffic and research in this area largely works with various assumptions. To address this deficiency, we present a thorough study of traffic of a real, free and publicly open SIP server. The findings reveal, among others, a surprisingly high overhead of SIP due to connection maintenance through Network Address Translation (NAT) nodes, differences from typical Web server Zipf’s-law patterns and various unexpected creative uses of SIP servers.
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