Jami’s bootstrap server has been blocked by some ISPs in China.
In these places, if you want to use Jami stably, I recommend setting up a bootstrap server and TURN server by yourself. If you need push service for mobile devices, you may need to setup DHT proxy.
The setup solution can be obtained from here: Use Jami on a LAN — Jami documentation
Of course, all of this requires you to have a public IP.
In today’s China, public IPv6 is relatively easy to get. However, if you only have public IPv6, then you will not be able to communicate with clients using IPv4.
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