503 service error on incoming calls

[scg_chris]

It seems the server stops working after about ~130 concurrent incoming calls hitting an IVR at a single time. I need the system to support 700+ concurrent calls at any given moment. We are currently in testing, but where can I look in FusionPBX setting for something that could be limiting call volumes.

Thanks!

 

[Adrian Fretwell]

When you get the 503, do you see an entry in the FreeSwitch log file?
What happens with the same number of concurrent calls but not hitting an IVR?

Have a look at your default settings in /etc/freeswitch/autoload_configs/switch.conf you may be hitting the sessions-per-second limit.

 

[scg_chris]

I found this in the logs`2020-05-08 02:16:56.723819 [CRIT] switch_core_session.c:2357 Throttle Error! 87`

I did update the switch.conf.xml file to have 1000 sessions per second.

had to restart, but its working perfectly now! Thanks @Adrian Fretwell

freeswitch@ip-172-31-12-33> status
UP 0 years, 0 days, 0 hours, 19 minutes, 34 seconds, 798 milliseconds, 138 microseconds
FreeSWITCH (Version 1.10.2 -release-14-f7bdd3845a 64bit) is ready
2201 session(s) since startup
0 session(s) - peak 1080, last 5min 1080
0 session(s) per Sec out of max 1000, peak 71, last 5min 70
2000 session(s) max
min idle cpu 0.00/35.30
Current Stack Size/Max 240K/8192K

 

[Adrian Fretwell]

Your seconds per second still shows max 30. You can look at and change the sessions-per-second values at the fs_cli with:
fsctl sps

or to set it:
fsctl sps 100