On a weekly basis, one or more users will accidentally dial 911 and then hang up (whereas they should stay on the line and inform dispatch that the call was an error). As a result, the city police department will call us back. If they have to call back more than x number of times per month, they send us a bill. What I'd like to do is have a trap sent to the receptionist every time a 911 call is made so that she can contact the caller and confirm that the caller stayed on the line. I do not believe we have CER in our environment (thus, I'm asking this question).