You can start Jamulus as Client and as headless Public and Private Server.

For starting in headless mode it exists two service files.
Additional two service files for toggle recording and new recording.

Starting headless Public Server
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 1. Change settings in /etc/sysconfig/jamulus

 2. Then starting Server with:

      systemctl start jamulus-public.service

      or

      systemctl start jamulus-private.service

For private Server you must enable port forwarding in your router
and perhaps open port UDP:22124 your firewall.

Connecting to your Private Server
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To connect local to your Private Server you must use localhost as your server in GUI.