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June 05, 2007

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Arif

To me, E911 is a problem for VoIP not only because of flat addressing of IP but also the way all the current VoIP protocols are designed. None of them concentrated on E911 issue beforehand. They came out with a protocol and accordingly designed their network. Thus getting any help from them is difficult. Of course, IP behavior is the main obstacle for E911.

This SOA based VoIP architecture, Service Oriented VoIP (SOVoIP)
http://jubaerarif.blogspot.com/2007/04/sovoip-new-voip-architecture.html
focusing on E911 from the scratch. This architecture is still long way to go but certainly a good start!

Ken Arneson

The only real way to locate a 911 caller is to have technology in the phone adapter, laptop or other end device that can be located when the user dials those 9-1-1 digits. The cell phone industry has done this for years.

There is a good blog about this at http://www.e911blog.com

Tony Palik

How about using RSVP to send a query from the PSTN PoP to the router nearest to the user ? This is like the GPS solution but would require no changes to existing hardware. There is flexibility in the packet format to allow this. See (http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/rsvp.htm) for reference.

Aswath

I have made the following point earlier: the fundamental problem is in the tacit assumption that E911 service is a “voice” service and then we are trying to extend it to VoIP. Instead we should consider E911 service is part of “access to PSTN” service (after all E911 is available in the Fax line as well) and so we should extend it to “Internet access” service. If we do that, then as you observe, wireline access providers can offer location service to PSAPs. We need to solve wireless access providers, just like we had to do in the wireless PSTN.

There is an additional benefit in doing this - as end points and PSAPs evolve, E911 can be more than just “voice” application. One can connect medical monitoring devices , for example.

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