connection of bearerbox with GSM modem

Hello,
I work with the cygwin installation of kannel on a win2k machine.
I have a peculiar problem with the bearerbox. 
When I start bearerbox utility and try and connect to the modem, the speed
in the conf file does not seem to match and the connection fails.

But if I try to connect to the modem thru the HyperTerminal (developed by
Hilgraeve for microsoft)
to the modem with the same speed, the connection comes through correctly.

Consequently if I try the bearerbox connection with the same conf file, the
bearerbox is up
and running fine.

Any idea why this would happen?

Best Regards
Anu