Sorry I can't Russian. ;(
So basically you need two steps to do the redirect.
Reject the client with "ConnectRedirectAddress:%s\n" (which %s is ip:port address) string in CBaseServer::ConnectClient phase, then set the target server with null reservation cookie.
The extensions behind this however is not public now since I don't sure whether it is needed and not mature in anyway. (And will be possibly "fixed" by Valve)
So I just let you guys know what's behind the sence.
The crucial part of extension is now public now.
Contribute to PerfectLaugh/RejectLobbyDisabler development by creating an account on GitHub.
github.com
You can also see the extension by Phoenix:
komashchenko/LobbySessionFixer
The ConnectRedirectAddress can be done by PTaH extension