If the 911 operator calls back and can verify the call, they will not dispatch if it not needed. This would requrie the main ALI info to include a numer that can be staffed at all times and have the ability to find out quickly who called 911 and why. There are a couple of e911 products out there that will facilitate this call coming back directly to the station that placed the errant call.
http://nena.org/Buyers%20Guide/