asterisk users - Dec 2008 - SNOM Red LED on DND or unregistered Phone

Hello,
I have BLF working on Snom phones. Ringing state (blinking) or "on the
phone" state (solid) are working well. So the buttons are configured as
"BLF" in the Snom webinterface.

Now I would like to add another state for unavailable or dnd. In fact I
would like to turn the LED red in the case the phone is not registered
or the user pushed the DND button.

So I though "snom action urls", the asterisk manager and sipsak would
be
my friends for this job.

But I have the following problem. I can change the LED using sipsak but
only if I have defined the type of the button as "Button" in the snom
webinterface which I do not want to do because BLF is working so well
for the rest.

Any ideas welcome. Maybe some Snom gurus are on this list.

Best regards,
Loic Didelot.