``` root@kam01:/home/henning# ls -ld /var/run/kamailio ls: cannot access '/var/run/kamailio': No such file or directory
root@kam01:/home/henning# ls -l /var/run/kamailio ls: cannot access '/var/run/kamailio': No such file or directory ```
Looks as not exist tmpfiles configuration file. I will make review of such file packaging.
About config options ``` modparam("jsonrpcs", "dgram_user", "www-data") modparam("jsonrpcs", "dgram_group", "root") ``` As now the `kamailio` main process started as a regular user, then the process does not have the capability to change process user and group. Extra capabilities may be added process back. Additional info https://manpages.debian.org/unstable/manpages/capabilities.7.en.html
Why you want to create Unix socket with owner other than default? Are you manage Kamailio via web server like `nginx`, `apache`?