If found if kamailio started from command line like `kamailio -DD -E` and present `log_engine_type="systemd"`, then i can see messages from `sd_journal_print` and `xlog` functions.
When I start kamailio with same config as systemd service then I not see messages from `sd_journal_print` and `xlog` functions.
When I disable `log_engine_type="systemd"` then i can see output of `sd_journal_print` and `xlog` functions again. Think some issue exist here.