How to configure USB modem?

Hello all, I am using SuSE 8.1 and I have a USB modem, but I do not know how to make it works. This is the information that I got: 56K SoftModem - Bus: USB - Class (spec): Modem - Class: Modem - Device: 56K SoftModem - Device identifier: 226644 - Device name: /dev/ttyACM0 - Model: SGS Thomson Microelectronics 56K SoftModem Thank you so much for your assistance. Best regards, Chan Choth