Are you using a hardware or software-assisted ("win") modem ? If it is the latter, then you'll have to install the relevent software for it -- have a look at
www.linmodems.org.
If it is the former, have you added yourself to the "dialout" group, and can you connect as root (only for testing) ? Do you see anything interesting when running the following (as root) in a separate terminal, as you try to connect:
Code:
tail -f /var/log/messages
Cheers,
mj