E911 does not follow the standard SIP RFC. That would be a good reason that they couldn't/wouldn't do it. Now that I say that I should qualify it and say "NG911 (or ESINet) does not follow SIP RFC" http://en.wikipedia.org/wiki/Next_Generation_9-1-1. That is not saying your county is not using standard SIP for E911, it just wouldn't be considered NG911.
From: Chris Nighswonger Sent: Fri 4/19/2013 11:41 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [asterisk-users] E911 Voip Trunking During the course of a conversation with an member of the IT group who handles the E911 center for our county, I learned that all of the county's E911 is voip based. This got me to wondering why we could not just configure up a SIP or some such trunk directly to the E911 center to handle our emergency traffic. The county seems interested in exploring the possibility. So I'm wondering if anyone else has attempted this. Kind Regards, Chris
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