The benchmarking listed below to be used while choosing the server specs for IraDialer on Debian
If you receive gateway_timeout/bad gateway errors or server becomes unresponsive when simulating a load test, it is possible that the load sent to the target is above the limit it can hold.
Also whenver a previous load test is not cleared from IraDialer end, the calls will still be going on which can add to the load. So while initiating a load test always run it on a clean environment.