public JID getFmucOutboundNode() {
        return fmucOutboundNode;
    }
Returns the address of the MUC room (typically on a remote XMPP domain) to which this room should initiate
FMUC federation. In this federation, the local node takes the role of the 'joining' node, while the remote node
takes the role of the 'joined' node.

When this room is not expected to initiate federation (note that it can still accept inbound federation attempts)
then this method returns null.

Although a room can accept multiple inbound joins (where it acts as a 'parent' node), it can initiate only one
outbound join at a time (where it acts as a 'child' node).

@return Address of peer for to-be-initiated outbound FMUC federation, possibly null.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MUCRoom.java