>
>...but now, the winfax 10.0 seems cannot get my number,
>it always prompt a window to ask me the fax number.
>

We sometimes had similar problems with Tobit FaxWare and David. Also the
dialogue was poping up though the number already has been provided. In
all these cases reinstalling the printer-driver solved the problem.

I don't know if this works for WinFax as well but maybe it's worth the try