Accessing a conference room in another Openfire server

If i am logged on to a Openfire server (Server A), how can I access the conference room of another Openfire server (Server B) without logging in to Server B?

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In Spark go to Conferences tab at the bottom and add the conference service of another server, e.g. conference.domain.com. Then you should be able to browse rooms of this server.

I tried that but it said “Unable to locate the conference service”. Do I need to configure the DNS or the server setting in the Openfire?

I haven’t done this myself, so i’m not sure. Maybe also servers has to have s2s connection established between them.

just add /etc/hosts in each server for hostname