Re: How to handle Validation failures was RE: [Sipping-emergency]proposed charter, new wg on emergency

["James M. Polk" <[e-mail]>]

At 08:29 AM 9/28/2004 -0400, Henning Schulzrinne wrote:
>This can be seen as a special case of testing. Thus, if you assume that 
>there is a test mode that attempts to reach the PSAP, but does not 
>actually ring, you'd have tested the full routing chain, including whether 
>the civic address is indeed mappable.

how would a new user to a new area (say I just got off the plane in Chicago 
and didn't know I was actually 25 miles away from that city, and 
jurisdictionally in another ERC's area) know they had the wrong ERC say 
their phone will indeed contact the right ERC when they do call 911?

Will a red flashing light go off on the phone with a warning screaming 
"danger danger will robinson"?

That the phone can do this test is huge for this effort, it is just a 
matter of telling which ERC responded positively, and either knowing that 
the phone can call 911 when the emergency arrives or the wrong ERC (when 
contacted) can transfer the call when it is placed.


>A separate question is whether a separate address-only validation mode is 
>appropriate. This probably depends on the overall architecture. As we've 
>discussed before, I think there is general agreement that you'd want the 
>ability for end-to-end non-interfering testing in any event.
>
>[e-mail] wrote:
>>Validating location information is implicit for routing. Otherwise,
>>all calls would be treated as "default" routed or worse, would rely
>>on other mechanisms to provide routing instructions outside the
>>control of the ECC (the ECC currently provides instructions and input
>>on the construct of the MSAG to the extent possible, which is used
>>for the validation process). Unvalidated location information could
>>reduce or even prevent a timely emergency response to a particular
>>location. As I implied before, the lack of validation should not
>>prevent delivery of a call to a geographically appropriate ECC
>>however, all efforts need to be made to ensure that end devices
>>utilize validated location information. So, if the charter of this
>>effort is to decide on how routing is accomplished than validation of
>>the information used to make that routing decision should be
>>considered in the process as well.
>>Nate
>
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cheers,
James

                                *******************
                 Truth is not to be argued... it is to be presented


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