Modem in Linux

[Dinh Tien Tuan Anh]

Hi, i'm using a built in, Ac'97 Modem in my IBM laptop. I can use dial up in 
Window, but not in Linux. I downloaded some drivers from Linuxant.com and 
installed them, but when I tried to activate the device, it said:
    Failed to activate ppp0 with error 2.

Could anyone help me please ?

I'm using Redhat 9.

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