Setting up Element Call on my instance was difficult on its own, I understand why Synapse doesn’t come with it out of the box, essentially you spin up Matrix’s JWT service for authenticating clients and it if approved opens the connection to the Livekit ports which must be opened on your firewall, otherwise people will not be able to connect to calls.

Big PIA and in my experience, on my home network, can conflict with games with VOIP chats.