[188746] in North American Network Operators' Group
Re: phone fun, was GeoIP database issues and the real world
daemon@ATHENA.MIT.EDU (Peter Beckman)
Wed Apr 13 23:54:53 2016
X-Original-To: nanog@nanog.org
Date: Wed, 13 Apr 2016 23:54:48 -0400
From: Peter Beckman <beckman@angryox.com>
To: Jay Hennigan <jay@west.net>
In-Reply-To: <570F03AD.6090202@west.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
On Wed, 13 Apr 2016, Jay Hennigan wrote:
> On 4/13/16 4:28 PM, Larry Sheldon wrote:
>
>> I am in frequent contact by a person that has a 917 NNX-XXXX-numbered
>> telephone who spends a lot of time with a person that has a 408
>> NNX-XXXX-numbered telephone, and they both live in Metropolitan Boston
>
> When either of those people dial 9-1-1, where does the ambulance show up?
I suspect your response was sarcastic, but when you dig into what really
happens, it's not nearly as sophisticated as one might hope.
If the numbers are land or VoIP lines, and the address associated with the
numbers are registered with the Automatic Location Information (ALI)
database run by ILECs or 3rd parties to fetch the address keyed on the
calling number, and the 911 PSAP is E911 capable, they operator will see
the ALI address.
If they are mobile devices, it depends. Basic gives you nothing (all phones
since 2003 should have GPS, but people hang on to phones a long time..);
Phase I Enhanced gives you the location of the cell site/tower, Phase II
gives you lat/lon within 50 to 300 meters within 6 minutes of a request by
the PSAP. Yep, the PSAP has to make a request for the phone location to
the carrier, in which they have 6 minutes to reply. I assume this is or
can be automated.
After 6 minutes, you could be a long way away from where you started the
call.
If the phone numbers are not in the ALI, or are not wireless, or the PSAP
(Public Safety Answering Point, the 911 office) is not set up for e911,
they probably get nothing, relying solely on the caller to provide
location information.
Beckman
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Peter Beckman Internet Guy
beckman@angryox.com http://www.angryox.com/
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