I don't know why I care about this - it's a service offered to business and if business wants to take it up that's their call. But if I were your kids school I would be looking at the far simpler solution of having one outgoing caller id regardless of the extension. I've had kids in school for 12 years now and have never received emergency communication from them. For the great balance of history, we've trusted schools to be able to make on the spot decisions on our behalf because we didn't have a phone in our pocket. And rightly so - the school has multiples of experience dealing with 8 year olds than I will ever have. What could they possibly need to consult me about in real time?