/usr/share/irssi/help/xmppserver is in irssi-plugin-xmpp 0.52+git20140102-1.
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1 2 3 4 5 6 7 8 9 | XMPPSERVER %|[-ssl] [-server <host>] [-port <port>] <jid>[/<resource] [<password>]
-ssl: use SSL when connecting (deprecated, StartTLS will be used by default if this parameter is not specified)
-host: the host
-port: the port (if not specified, 5222 is used for a normal connection or 5223 for an SSL connection)
This command disconnects the server in active window and connects to the new one. It will take the same arguments as /XMPPCONNECT.
See also: XMPPCONNECT, CONNECT, SERVER, DISCONNECT, RECONNECT, RMRECONNS
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