For load test, customer server uses mod_iratest module to answer/reject calls.
The configuration can be found in \etc\systemd\system\iraswitch.service file.
Change the following parameters as required:
cpa_ratio - LV:AM
connect_ratio - Answered:Rejected
Any changes to the configuration file requires iraswitch to be restarted.
Stop the service - sudo systemctl stop iraswitch
Start the service - sudo systemctl start iraswitch
Note:
Restarting the switch causes all the calls to be dropped.