is there a open source software to observe the software and hardware performance of a server pbx freepbx and even number of simultaneous call can support this server
The resources required per call vary by more than an order of magnitude, depending on whether the system is transcoding, recording or playing media, listening for DTMF and/or performing functions such as jitter buffer and echo cancellation. IMO automated evaluation is not feasible. OTOH, both free and commercial load emulation software is readily available, so you can easily determine how many calls can be handled at a given quality level.
For example, see http://sipp.sourceforge.net/ . IMO you should have one or two real calls in concurrent with the artificial load, to subjectively assess the severity of any quality degradation.
thanks, sipp is that it can give me number of simultaneous call in my ipbx server ???
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