There is only one way to check whether the drivers are working or not. You will have to see if your modem is recognized or not. The driver makes a node for your modem at /dev/ttyS15 , no matter what com port it may be in in M$DOS/M$ Windows. /dev/ttyS15 is symlinked to /dev/modem and as most programs search for a modem at /dev/modem first, you will not have to fiddle with the settings/configs of those programs. The program that I use to test my modem in linux is minicom. If you have minicom installed, what you have to do is type
bash$ minicom
in a shell prompt or in a terminal emulator window. If everything is all right, you will see a Initializing modem message for a few seconds and then a screen with a blinking cursor. Just type in ATZ in that screen and hit the enter key. If you see a OK message, then, congratulations, your modem is working in linux. Type in ATI 3 and hit enter and you will see a PCtel HSP56 MicroModem output. If you get a error message, proceed to the troubleshooting section. If everything is all right up to now, you can go ahead to configure your dialer software and connect to the internet.