Once I restart FreeSwitch I’m able to do 100cps without a problem but once I go beyond this I get “503 Maximum Calls In Progress” which is okay due to my hardware limitation. My problem is that once I get this SIP message, and restart my tests again without starting FreeSwitch, I only able to do about 50 and start getting the “503 Maximum Calls In Progress”. I have to restart FreeSWITCH to go back to 100cps. After digging in a little I see that in switch_core_session.c , runtime.profile_time has a lower value when there is one call before the restart than after the restart. This causes the calls to reach CPU limits faster than when I restart Freeswitch. if (runtime.min_idle_time > 0 && runtime.profile_time < runtime.min_idle_time) { return NULL; } What could be causing this? Joe