The paper deals with performance testing a SIP infrastructure. While the working methodology for measuring performance and effectiveness of the SIP B2BUA and SIP Proxy has recently been introduced, the more complex application of this methodology is still missing. This paper tries to fill this gap and improve the methodology further to better fit into the planned modular design of the testing platform, which is being designed in the VoIP laboratory of VSB – Technical University of Ostrava. By separating registrations from calls, we were able to measure both cases without the need of extensive postprocessing of data to ensure the data in one case is not affected by the ones from the other case. Furthermore the security vulnerability of the SIP protocol has been harnessed to allow measuring software for performing both registrations and calls together but in individual processes, which builds the basis for planned and already mentioned modular design of the platform. In this paper the results from separate registration stress test analysis will be presented as one of the examples of usage of the mentioned methodology.
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