I just had a look at the “server”-tab. I recommend that you read that.
The simple server as shown in the command line by Fred doesn’t have control over the own signal to get routed back.
The complex server will have that ability, but is in beta stage now and not (yet?) available to the users.
I’m specualting that the Virginia Mass Server might be such a complex server (for many participants, currently up to 32), but control is only available to the developers since it is still in development.