2509 and USR v90 modem

[jysolar]

I was trying yo setup 2 USR sportster modem in a
Router 2509, because I`m replacing my olds Multitech
modems, the problem is that with the new USR
the router dont crate a connection, I try
different chat scripts, but i couldnt make it work,
but if a set back the multitech old modem it works
at first try.

Does anyone knows how to set a USR Robotics / 3Com
modem, the model is 56K v.90...