GENIEACS + STUN server

Hello!

I want to manage NAT-ed clients.
Debian 10, Genieacs 1.2.9.
I added the cwmp.udpConnectionRequestPort in the GenieACS UI with value 3478, I installed the coturn server but it didn’t work.

Can someone explain to me which STUN server to install and how to configure it to work?

Best regards,
Zoltan