SCONNECT <new server> [[<port>] <existing server>]
The server to connect to, the connection port and the remote server that initiates the connection attempt.
If no remote server is given, the server you are currently connected to will be used.
Connect a server to the IRC network; this command is restricted to IRC operators.
/SCONNECT ircsource.irssi.org /SCONNECT ircsource.irssi.org 6667 be.hub