Lot of XMPP clients (Gajim, Kopete, Jitsi, Psi, Psi+, etc) are able to store the bookmarks marking XMPP MUCs on the server (with optional bit whether the MUC should be joined automatically on the connect to the account). XEP for this functionality is ​XEP-0048. I think this feature give a great liberty to the user that can choose and change of XMPP client without having to copy all his bookmarks each time. It's a basic and very useful feature of XMPP. Reproducible: Always
How is this not implemented yet?
Nobody has written the code, perhaps?
I figured. It's just weird that this feature was not included when the current bookmarking code was written. All major clients support Bookmarks, and KTp already has most of the required code. The only thing missing is reporting bookmarks to the server and automatically joining bookmarks marked for automatic joining...
It seems that Telepathy haven't spec for this feature, so there is nothing to do on KTp side yet. With that in mind, I would not expect bookmarks in the near future. May be in the next year.
Will this help in solving bug #307990 (Auto join jabber conference rooms) ?
No; that bug requires the patch from comment #13 first and foremost.
Dear user, unfortunately Telepathy is no longer maintained. Please migrate to another solution, e.g. for Jabber a possibility is Kaidan, for Matrix a candidate is NeoChat.