If an ISP bans these TURN servers, can the customers behind the NAT network of this ISP still use Jami?
I got the answer from the official blog:
turn.jami.net is the server provided by the Jami project, and it is enabled in Jami by default.
This is one of the few centralized services in the Jami system. When it is unavailable, customers behind the NAT cannot use Jami.
Jami does not have a large number of relay nodes, which is not very robust.
the setting can be modified to whatever turn you want to use