For those of you setting up IP based telephone solutions and are needing to set up E911 connections, there are a number of ways to do this.
The typical way to do this is to ensure that analog or digital lines are available at
each location being serviced. Then be sure to route all calls originating from those
specific geographical areas are sent out the nearest POTS (Plain Old Telephone Service)
line, ie, analog or digital line.
If this isn't possible, for one reason or another, there is an alternate way of doing
this.
There are internet based E911 services available. According to Robert Kulagows, you "setup
something like a SIP trunk and route e911 calls to them. You'd tell them which DIDs are
located in which city, and allow them to handle the
911 call and send it to the correct PSAP."
One provider who can do this is 9-1-1
Enable. According to their site, they are in the Pulver 100 and the Internet Telephony
2006 Product of the Year.