@rampageai: thanks for the notes for CentOS, I added them to wiki:
* https://www.kamailio.org/wiki/tutorials/troubleshooting/coredumpfile#centos_...
The `ulimit` is useful if the core file is going to have a large size, it may be already set to a value large enough, however setting it to `unlimited` ensures the size won't hit any system limit.