Most Chinese users are behind NAT, which means that once the TURN.jami.net server is blocked, most Chinese users cannot use Jami.
And the GFW can not only block this TURN server, but also the entire TURN protocol to block all overseas TURN servers. Just as they have banned all the overseas proxy servers by blocking the protocols.
Available IPv4 is scarce, and it is difficult for personal use to apply to the ISPs.
When IPv6 becomes popular in a few years, NAT may not be needed.
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