Actually we need to enter the setting of a route/trunk/extension to enable / disable it.
It would be great if we could have a checkbox on the main table (where extensions or trunk or routes are listed depending on the menu we are) to enable / disable the element.
Box checked : enabled (active)
Box unchecked : disabled (inactive) - line in red color
This will permit to gain time when we want to "play" with settings.
And more generally :
For all the modules, a red colored background in the main table would indicate a disabled function.