Index: etc/kamailio.cfg
--- etc/kamailio.cfg.orig
+++ etc/kamailio.cfg
@@ -177,6 +177,9 @@ log_prefix="{$mt $hdr(CSeq) $ci} "
  * - value inherited by tcp_children and sctp_children when not set explicitely */
 children=8
 
+user="_kamailio"
+group="_kamailio"
+
 /* uncomment the next line to disable TCP (default on) */
 # disable_tcp=yes