I also saw in other tickets, sometimes module loading order is an issue. In my case:
``` # cat /lib/systemd/system/kamailio.service [Unit] Description=Kamailio SIP Server Documentation=man:kamailio(8) https://www.kamailio.org/ After=network.target postgresql.service
[Service] Type=notify User=kamailio Environment=SHM_SIZE=128 PKG_SIZE=8 ExecStartPre=/usr/sbin/kamailio -c ExecStart=/usr/sbin/kamailio -DD --loadmodule=systemdops.so -m $SHM_SIZE -M $PKG_SIZE ProtectHome=true Restart=on-failure RestartSec=30
[Install] WantedBy=multi-user.target ```
``` # grep ^loadmodule /etc/kamailio/kamailio.cfg loadmodule "log_systemd.so" loadmodule "db_postgres.so" loadmodule "xhttp.so" loadmodule "jsonrpcs.so" loadmodule "kex.so" loadmodule "corex.so" loadmodule "tm.so" loadmodule "tmx.so" loadmodule "sl.so" loadmodule "stun.so" loadmodule "outbound.so" loadmodule "rr.so" loadmodule "path.so" loadmodule "pv.so" loadmodule "maxfwd.so" loadmodule "usrloc.so" loadmodule "registrar.so" loadmodule "textops.so" loadmodule "siputils.so" loadmodule "sanity.so" loadmodule "ctl.so" loadmodule "cfg_rpc.so" loadmodule "acc.so" loadmodule "counters.so" loadmodule "auth.so" loadmodule "auth_db.so" loadmodule "permissions.so" loadmodule "alias_db.so" loadmodule "speeddial.so" loadmodule "domain.so" loadmodule "presence.so" loadmodule "presence_xml.so" loadmodule "nathelper.so" loadmodule "rtpengine.so" loadmodule "rtpproxy.so" loadmodule "tls.so" loadmodule "htable.so" loadmodule "pike.so" loadmodule "debugger.so" loadmodule "topos.so" loadmodule "jansson.so" loadmodule "dialog.so" loadmodule "group.so" loadmodule "imc.so" loadmodule "lcr.so" loadmodule "app_python3.so" loadmodule "textopsx.so" loadmodule "msilo.so" loadmodule "presence_dialoginfo.so" loadmodule "presence_mwi.so" loadmodule "pua.so" loadmodule "pua_dialoginfo.so" loadmodule "ipops.so" loadmodule "sdpops.so" loadmodule "sipdump.so" loadmodule "sqlops.so" loadmodule "http_async_client.so" loadmodule "uac.so" loadmodule "diversion.so" loadmodule "tmrec.so" loadmodule "websocket.so" loadmodule "auth_ephemeral.so" ```