Self-host
Use your own relay server without a hosted account.
Start your relay
Run the relay server on your own machine or network, choose a room password, and note the reachable address.
Create the room from OBS
Open the Self-host tab in the dock, enter the relay address and password, then create a room. The guest key is safe to share. Keep the host setup key private.
Internet exposure
For internet use, terminate TLS, forward the relay TCP port, and verify that the public hostname resolves to your relay host.