Re: [Ecrit] Nonce value -- RE: PSAP Callback - A New Beginning

[Brian Rosen <[e-mail]>]

The US PSAP registry maintained by the FCC is generally thought of the weakest of the available listings, primarily because:
a) It has more missing PSAPs than the other available registries
b) It doesn't differentiate between primary and secondary PSAPs (and there are more than 6000 primary PSAPs).  Primary PSAPs answer 9-1-1 calls and may dispatch.  Secondary PSAPs only dispatch responders.   A call dispatched by a secondary PSAP is answered initially by a primary PSAP.

There are several other registries that are better.  The NENA registry is better, but the commercial database is probably the best.  None are super accurate.

NENA thinks a PKI for primary PSAPs is practical and is working on the CP for it now.  6000 is not a very big number, and if you do it national to state  to regional hierarchy, you can get good quality credentials.

We need PSAP credentials to allow LIS operators to obscure location for non emergency use.

I think assuming some reasonable credential is acceptable.

Brian


On Feb 22, 2012, at 9:04 AM, Henning Schulzrinne wrote:

> Given that there are 6000+ PSAPs in the US, this is likely to be challenging. (We have proposed a mechanism, http://datatracker.ietf.org/doc/draft-ono-dispatch-attribute-validation/, that would make something like that relatively easy, since there's a US PSAP registry maintained by the FCC, but this does require some changes in UA.)
> 
> On Feb 22, 2012, at 3:40 AM, Christer Holmberg wrote:
> 
>> 
>> Hi,
>> 
>> In many networks the PSAP identity could be asserted, to ensure that the call doesn't come from "anyone".
>> 
>> Regards,
>> 
>> Christer
> 
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