I'm not sure you'll be able to do what you intend (but I may not have understood correctly, so please bear with me ...). Disclaimer: Some or all of this may not apply to your RedHat system; since I don't run RedHat, I can hardly claim to be an expert. However, I've set up more dialin systems on various flavors of Unix/Xenix/Linux than I care to remember, so at least some of the info may be useful ... As always, discard at will ...
In general, you will not be able to spawn a telnet session from an incoming serial (modem) connection. Telnet is a network protocol, typcially associated with port 23. However, you certainly can spawn a normal login session (i.e., shell) via a dialup connection. If this is what you intend, you will need to establish a getty on the dialup line (typically done by modifying /etc/inittab) and configuring your modem to answer incoming calls. You will also need to configure basic line characteristics in /etc/gettydefs (although the existing entries may be fine for your purposes). If you have done these things and you still don't get a login prompt, try hitting the return key several times when you connect and see if that wakes up the login.
Hope this helps -- additional info appreciated.
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