First of all, I recommend using ssh instead of telnet if possible; telnet doesn't encrypt the data sent, so any passwords used are sent in clear text visible for anyone who gets to read the traffic (which is not difficult). It's your decicion, of course, but using ssh would be more secure - and not more difficult.
The solution depends on how you do the thing. How do you display the menu? What sort of "menu" is it? Maybe you could use a script to start it (or if it is a script already, modify it), and use something like sleep to make the menu wait a moment before filling the screen, so that the user could see a message of password expiration or something.
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