[Asterisk-Users] AutoAttendent ON/OFF control by Attendent

[Sri]

Hi All
This is one scenario I would like to have some help.  I have searched 
the digium lists and could not find any posts on this.

How can an Attendant switch on or off the AutoAttendant from her phone?
Eg.
 8am -> Attendent enters office -> switches OFF auto attendent.  He/She 
takes in all the incoming calls and answers.
 12pm -> out of lunch. Needs to put the system back into Auto.  
 1 pm -> return from lunch. Needs to switch OFF auto attendent
 5 pm- > Puts Auto attendent ON.

I am sure there can be a script built that should change 
extensions.conf. and reloading asterisk on the attendent activating 
based on a clock that kicks in 8 am, 12 pm, 1 pm and 5 pm.
I dont want this to be time restricted. the attendent should have control.
Is there a better way ?  this could be even done through the phone of 
the attendent eg, like *80-1 (ON) *80 - 2 (OFF)...