Looks like systemd service pid files should nowadays be placed in /run dir instead of /var/run. I noticed this when I got complaint about fail2ban to syslog: Oct 17 20:59:35 lab systemd[1]: /lib/systemd/system/fail2ban.service:12: PIDFile= references path below legacy directory /var/run/, updating /var/run/fail2ban/fail2ban.pid → /run/fail2ban/fail2ban.pid; please update the unit file accordingly. I haven't tried yet with Kamailio, but suspect that a similar warning would be issued. So how about making the change in https://github.com/kamailio/kamailio/blob/master/pkg/kamailio/deb/buster/ka… -- Juha