Hello everybody. I have been running some load tests on IAX2, as we are finding out our future hardware investments.
Here is the setup: We have three virtual machines. A: running SIPP and Asterisk 1.6.2.7 B: running Asterisk 1.6.2.7 C: running Asterisk 1.6.2.7. All of the Asterisks have been compiled with as little modules and channel drivers as possible, etc. only SIP, Local and IAX2, and about 4 dialplan functions. They are connected as this. A -> IAX2 -> B -> SIP -> C On the A machine, SIPP makes SIP calls to the asterisk, which then dials server B through IAX, which then in turn dials server C through SIP. The scenario is to have machine B as a IAX2 <-> SIP converter. Asterisk on machine A and B dies around 185 simultaneous channels, consuming all CPU on the machines, until they eventually crash. Machine C, which is only running SIP, consumes around 30% CPU at the 185 channel mark. This result gutted me somewhat, as 185 channel is a really low figure. And 185 channels is where it crashed, so 160 channels would probably be a safer estimate per machine. When using only SIP we have been able to run over 860 calls on a single Asterisk 1.6, and the factor that stopped using more channels, was our Cisco PIX506 firewall crashing. Ive read several places, that IAX2 scales really horribly, and having confirmed that, I am wondering if anybody has a solution for this. My own idea was to develop a IAX2 -> SIP procotol converter. Ive worked somewhat with the IAX2 protocol in code, and it should absolutely be possible, but unfortunately, i do not have the time for such a project. Any other ideas? Med venlig hilsen/Kind Regards Jon Leren Schøpzinsky
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