For everyone's information:
After a long search I found a way to get the Agere AC97 modem working
on my HP Compaq nc6000 laptop.
I use the slmodem software (www.smlink.com) version 2.9.6.
I tried later versions of this software, but I found that on noisy
lines, the modem does not dail in. It stops with a "NO CARRIER" error.
Version 2.9.6 of the slmodem driver works fine.
I am using Fedora Core 1.