firstname.lastname@example.org -> email@example.com
Personally, I have failed, but maybe there is still a way. I have raised 2 servers. I tried it with one of your account to join a conference on another server.
JID-the user who tries to connect is in the list of group members.
Am using openfire 3.6.4 (same and different domain). for test connections.
Found a solution
_xmpp-server._tcp.conference.jabber1.ru. 3600 IN SRV 0 0 5269
_xmpp-server._tcp.conference.jabber2.ru. 3600 IN SRV 0 0 5269