Originally Posted by plam tree
I have old desk top computer dell dimension 4500s 2002 with BCM V.92 56K modem.
You have what is known as a soft modem. A soft modem is a internal modem which does not have all of the hardware necessary to work correctly. The difference is corrected by a Windows software driver supplied by the manufacturer. I have never been able to get a soft modem to work on Linux.
The solution to your problem is to do as didadio suggests. Buy an external dial up modem. All external modems have all of the hardware functions built in to be a complete dial up modem. An external modem does not need any specialized driver and will work on any operating system.