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Setting up Linux for Dial-In
You can set up the same modem for dial-in use as well as dial-out use (only one operation is allowed at any one time, of course). Setting up a modem for dial-in use involves setting up a program that monitors the serial port for any incoming calls; this program provides the login prompt. You can use the mgetty program for this purpose.
Chapter 13 describes how to set up Red Hat Linux as a dial-in PPP server. That description also tells you how to set up the mgetty program for dial-in. You can learn more about setting up dial-in modems by reading the latest Modem-HOWTO at the URL Chapter 21 for information on how to install RPMs).
