Good point. Would it be possible for them to do this in two buton presses on seperate phones? The only way I can think of to do this on a non-time of day scenario would be to use an Attendant overflow function. This would require another phone, but would allow calls to be sent to normal NITE recording at all times, then go to your emergency recording in an emergency, and override the NITE entries.
What you would need is to build a 2006 (or 2008)with two keys on it, a currently unused DN and an OVB (Overflow Position Busy) key. Then, in LD 15, set your AODN to the DN on the 2006 and set your AQTT to whatever you want, as this will not be really used for overflow.
Now, place the 2006 next to the console, and select a Ring cycle for the 2006 with as few rings as poossible. Have your emergency message be a voicemail message, and point the DN on the 2006 to voicemail. To test, with the console in NITE, press the OVB key on the 2006 so it is NOT active. Call the new DN and make sure you get your emergency message. Press the OVB key again to place that set in a busy state.
With that tested, you are all set. All the operator needs to do in an emergency is to press the OVB key on the 2006 FIRST, then place the console into NITE. This will direct all calls to the AODN defined in LD 15, which rings to your emergency message. Calls will continue to be answered this way unit the console is taken out of NITE mode and the OVB key is re-activated.
You may be able to use a CFW key on the 2006 to reduce the ring time, but I have never tried that.
I know it is not one button, but it would acomplish everything else you need.
Scott M.