asterisk users - Nov 2004 - Setting DND feature via access code

I commonly use the DND feature in Asterisk by dialing *78.  When I do this I
hear about a second of stutter dialtone to let me know the feature was set.
Is it possible to configure the Zap channel to continue to provide stutter
dialtone while the line is in DND?  This way if someone forgets to turn it
off or is unaware that it is even on, they would have some indication as
soon as they go off-hook.

Thanks,
--LJ