modem problem (winme)

this new fax/modem was installed sucessfully acording to
windows there are no conflicts. There is a telephone/fax
connected as well. When dialing, the computer is silent,
but the modem sound and dialing can be heard on the phone,
the dialing message box appears and changes from "dialing"
to "checking username and password" yet no confirmation of
successfull connection. All connections were checked.
Any Ideas?
Thanks in advance