In order to learn more about how DMR works, I set about trying to implement my own server. I first looked at Brandmeister and Phoenix, could I download and run my own? No, they are closed systems.

Searching around I came across HBLink3. I found lots of references to it and even a few forks.

I quickly set up a simple bridge in a docker container, and was able to handle a conversation. I invited a few other people on play as well, and quickly discovered that all traffic was sent to all peers (Pi-stars) registered. This turns out to be by design.