In case someone else runs into this issue -- it was far from transparent, but
my best guess is it was caused by some combination of file permission issues.
These are the various things on CentOS 7 that were tweaked to allow a core dump
The following combination of things were changed:
/etc/sysctl.d/99-sysctl.conf
```
kernel.core_pattern = /tmp/core.%e.%p.%h.%t
kernel.core_uses_pid=1
fs.suid_dumpable = 2
```
`sysctl --system` to reload kernel parameters
/etc/sysconfig/kamailio
```
DUMP_CORE=yes
```
May be required but unclear:
`ulimit -c unlimited`
Tested by running
`kill -ABRT <PID of Kamailio Child>`
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