resolve fresh install issues on centos 7

system/systemd/kazoo-kamailio.service

@@ -5,14 +5,11 @@ After=syslog.target network.target
 [Service]
 User=kamailio
 Group=daemon
-WorkingDirectory=/var/run/kamailio
 PermissionsStartOnly=true
-PIDFile=/var/run/kamailio/kazoo-kamailio.pid
 ExecStartPre=/usr/sbin/kazoo-kamailio prepare
 ExecStart=/usr/sbin/kazoo-kamailio foreground
 ExecReload=/usr/bin/kill -HUP $MAINPID
 Restart=on-abort
 
 [Install]
-WantedBy=multi-user.target
-
+WantedBy=multi-user.target