Nested ring groups and precedence of 'Destination if no answer'?
Take the following test scenario ...
Ring group 8000 rings ...
ring group 8001
... for 20 seconds and the 'Destination if no answer' is extension 1.
Ring group 8001 rings ...
... for 20 seconds and hangs up the call.
What 'Destination if no answer' is taken into account?
The one from the master ring group so the call is indeed forwarded to extension 1 if you wonder what will happen.