You should use the software that comes with the GeoPort Telecom
Adapter. The Express Modem Software 1.1.2 is compatible, but there's
much more software installed by the GeoPort Express Modem Installer
than by the normal one. Software installed includes the Shared
Library Manager, ASLM Resources, GeoPort Extension, GeoPort Telecom
Adapter, and GeoPort Telecomm. Without these files, you can't use the
GeoPort Telecom Adapter.
If you installed the proper software, and still experience problems
with disconnects or aren't connecting at all, try turning off error
correction. You can do this with the modem command: &Q0 in the modem
string.