muc/sub subscribers

Hi
In MUC, group members work using bookmarks for joining to their's group.
how does work subscriber in muc/sub? how does subscriber know to subscribe in it's groups?
Thanks in advance.

> how does subscriber know to

> how does subscriber know to subscribe in it's groups?

See: A user can query the MUC service to get his list of subscriptions.
https://docs.ejabberd.im/developer/xmpp-clients-bots/proposed-extensions...

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