Re: [Ecrit] Emergency Call Framework for Canada; Questions on draft-ietf-ecrit-framework-09

["François D. Ménard" <fmenard at xittelecom.com>]

> On the topic of privacy; real-time IP location determination is a
> _MASSIVE_ privacy issue that will need to be addressed with public
> policy, not an RFC.

That's a good reason to keep the location in the end-point, where the  
end-point would only reveal it upon requesting S.O.S.

I find that OBO is a _MASSIVE_ violation of privacy.

> Keep in mind that the VOIP provider already has sensitive personal
> information for the user so suffice to say that as long as the
> information is only accessible to authorized people, then exactly who
> those authorized people are is something for the politicians to  
> decide.

However, the VOIP provider if access independant (i.e. Vonage atop an  
ISP), has no idea of the location associated with the underlying  
circuit.

The question here is if VONAGE is to steer the call to the right PSAP,  
based upon which information will it be able do that ?


> > "On behalf of" is needed when the device DOESN'T get it's location  
> > from its
> > access network.  I think you have a point on the language of the on  
> > behalf
> > of language in -phonebcp, but your suggestion is not good enough.   
> > The
> > problem to be solved is one way or another we have to get  
> > location.  The
> > current wording is aimed at proxies who think they ought to do it  
> > always,
> > and the language says, fine, as long as you CAN do it always.
>
> Actually, I think BCP would be: "Proxies MUST provide location on  
> behalf
> of devices ONLY if the device does not provide it's own location."

That's a good statement, but it is not sufficiently precise.

The question is 'how can proxies (which are by definition stateless),  
inspect an S.O.S. call and try to look for the presence of a PIDF-LO  
by way of SIP LOCATION CONVEYANCE', and upon that not being there,  
decide to inject it.

This seems like a violation of the mother-rule-of-SIP, which is that  
proxies do not modify SIP message contents, which is where Lby? lies.

Some people are claiming that adding Location-by-reference does not  
violate the rule, however location-by-value would violate the rule.

What's the latest take on that?

> "If the device does not provide location and the proxy can't find
> location OBO the device, then the call MUST be routed to a 3rd party
> call centre for verbal location and routing."

What mechanism will a PROXY use to make this determination?

f.


> Regards,
> --
> John Lange
> http://www.johnlange.ca
>
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