coturn service does not start

The systemd command looks like it is running :

systemctl status coturn
● coturn.service - LSB: coturn TURN Server
   Loaded: loaded (/etc/init.d/coturn; generated)
   Active: active (exited) since Wed 2020-06-17 11:28:23 UTC; 44s ago

But it does not start by default. The file /etc/default/coturn needs to be modified by uncommenting the line #TURNSERVER_ENABLED=1