Can't say I really understand how you're trying to do this (never tried anything like that), but the best way to get command-line access to a Linux box is using SSH. It's secure, and many distros will have an SSH server set up (and possibly even running) out of the box. Windows doesn't come with a client, but
PuTTY is reliable.
-- although I missed the phrase "dial in" on my first reading of your post, so it would probably not work. Is
this of any use?
Rob