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I'm unsure if this is an ISDN problem or a USB glitch. It's certainly happening more often since I migrated to a new machine so I'm totally unsure.
When the connection freezes I can disconnect (but I think the line has already been dropped) using the screens icon on the sys tray. I then can't redial 'cause it says no dial tone but if I unplug the USB cable then replug the dial-up networking works.
Also, If I disable the USB ISDN device from the Divice Manager screen then re-enable it the DUN will connects ok.
Anybody any suggestions as to where the fault might lie?