Just use the 90v lamping with stutter and you have both worlds. The only other option...here is an idea, I assume you have to dial 11 digits 1+ area code right? Make dial access 1 your trunk acess key (if extensions don't conflict)then build an nxx with 10 digits in your ARS to put a 1 at the beginning. Then create a public library 911 for dialing 911.