Some (most?) versions of U.S. Robotics modems, formerly refered to as 'winmodems' will not work in Linux.
I'm not sure about Redhat 6.1and winmodems...that's old.
But I do know that with my Intel 536ep 'hardware-based' modem, I have to recompile the modem's driver everytime I upgrade the kernel.
Have you ever installed the driver for the modem before on REDhat 6.1?
I had a U.S. Robotics modem and it would not work with Linux, so I purchased a REAL modem off of e-bay for about $10. That's right. This is a v.92 controller-less hardware-based modem that would cost about $50-60 in a store.
Don;t feel bad if you can not use the modem anymore. A new 56k modem bought off ebay, like mine, is better, faster, more features, and will work with both Linux AND Windows.
Gee, I hope this helps. What is the model of the modem. There are sites out there dedicated to providing drivers for winmodems...so they will become Linmodems.
Winmodem = a software-based modem relying on software only compatable for Windows.
Linmodem = a winmodem used under Linux with special software and drivers.
hardware modem (controller-based, or controller-less, hardware-based) = true modems with DSP and capable of running under Windows AND Linux.