We took the time to do some performance tests for two of the most important components of OpenSER 1.2.0: transaction module (tm module) and user location (registrar and usrloc modules).
The results show the capacity that can be handled by the two components, which should move the concern that they are bottle neck in a VoIP system. The numbers are higher than what one would want to deploy in real life within only one physic VoIP server.
TM got performance of processing over 28 millions complete calls per hour while user location can handle registration coming from over 4 millions phones with an average of 10min for expiration time. Testing server was an ordinary desktop, Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz, 1GB of memory, 100Mbs Ethernet card.
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