I use a dial-up connection with only one phone line. When AOL was my ISP, any incoming call would knock me off-line. Since I've switched to NetZero this does not happen, however friends tell me when they try to call they get a normal ringing tone, not a busy signal.
My question is this: How can I configure my setup so that when I'm online I'm alerted to incoming phone calls and can decide whether I want to take them? Or perhaps there's a way to route calls to my answering machine?