there are potentially better ways to deal with spurious 911 calls than changing the prefix to dial out.
1. in ARS, add ; after the 11 entry
2. add a new 11N entry = call barred.
thus.
1, if user dials 911, they are connected after the dial delay timer expires (4 seconds by default). This timer can be shortened on the ARS, but the shorter you make it, the less effective the change is at barring spurious E911 calls.
2. 9+911 works as before, immediate connection
3. 911+ any other digits is barred (whee-whaa tone)
In my experience this deals with almost all spurious E911 calls, which are mostly caused by people either fat-fingering the 1 as they dial a LD call, or by dialing 9+1, then looking at the number, then dialing 1+800...etc.
GB