Just so everyone is aware and may want to voice their opinion on this law proposal.
There is an ongoing petition to make it a federal law to require all PBX to have 911 functionality.
And it looks like it is being picked up.
I know E911, can be implemented properly and even with dial plan that covers 911 9911 and other combinations to ensure it gets dialed out, I also found this site with the current state laws:
I think it would be great if the law included a E911 voip provision with a federal maintained 911 voip endpoint. Which can be used as a failover local 911 or PSTN is unresponsive.
I wanted to share this and hear other peoples opinion on the subject.