1. PPP dialer with built-in intelligence. WvDial sacrifices some of the flexibility of programs like "chat" in order to make your dialup configuration easier. When you install this package, your modem will be detected automatically and you need to specify just three parameters: the phone number, username, and password. WvDial knows enough to dial with most modems and log in to most servers without any other help. In particular, you no longer need a "chat script" to handle the most common situations. From Debian 3.0r0 APT

2. WvDial automatically locates and configures modems and can log into almost any ISP's server without special configuration. You need to input the username, password, and phone number, and then WvDial will negotiate the PPP connection using any mechanism needed. From Redhat 8.0 RPM