I felt sorry that nobody had responed to your plea...
Anyway, the thing you probably need is called a "Modem Script". I know you said that you copied everything over, but maybe you missed the modem scripts, or they got corrupted or something. I don't know how fast or what chips the 4400's have, but I can hardly believe you're running OS 9 on it! My 5200 chokes on 8.x OS's! (It's a 75MHz) Anyway, in the Extensions folder, there is a folder called "Modem Scripts", and that's where you need to look... OS 9 probably doesn't come with scripts for the kind of modem you've got.
We're supposed to sing about piraty things!