Subject: [Sip] Re: AW: [Geopriv] Explicit Indication of Location Object Consumer

From: "James M. Polk" <[email-masked]>
Date: Mon, 22 May 2006 10:48:23 -0500

At 04:38 PM 5/22/2006 +0200, Tschofenig, Hannes wrote:
>Hi James,
>
> > I am inclined to agree with Brian here.
> >
> > I am not sure why a proxy would just pickout a location URI and
> > de-reference it unless the proxy needed to use it in some way anyway.
> > Perhaps the example is not such a good one. Hannes do you
> > have something
> > more concrete in mind?
>
>The location conveyance draft has emergency and non-emergency
>applications in mind.
>With emergency calls you want the proxy and the PSAP (as the other end
>of the call) to process the location objects.
>For non-emergency applications you either might want the proxy (for
>location-based routing or the end host to process the LO; or even both).
>So, do you think there is no need to tell which entity should process
>it?

I do not believe Alice's request message needs to have a special indication 
in it with "what to do" here.

Let me give two scenarios:

Alice dials 1-1-2, meaning she is calling for help. Her UA recognizes this 
and chooses to use TLS, knowing proxies cannot easily (or at all) decrypt 
S/MIME.

Alice sends her location in an IM to Bob. She is not calling for emergency 
help.  Her UA S/MIME encrypts the message body.  If Bob then tells her he 
received her IM but not the associated location, Alice can do something 
special to her UA to (one time only probably) send her location in an IM to 
Bob without S/MIME.  This will probably be using SIPS (i.e. TLS).

Does this make sense?

>Ciao
>Hannes
>
> > > -----Original Message-----
> > > From: Brian Rosen [mailto:[email-masked]]
> > > Sent: Monday, 22 May 2006 11:05 AM
> > > To: 'Hannes Tschofenig'; [email-masked]; [email-masked]
> > > Subject: RE: [Geopriv] Explicit Indication of Location
> > Object Consumer
> > >
> > > I would say no.  If the location is not needed by proxies, then I
> > would
> > > say
> > > you MUST protect it (S/MIME), or it will not be private.
> > >
> > > If you have to route on it (emergency or otherwise), then
> > you have to
> > send
> > > it with TLS, and the proxies can see it.
> > >
> > > Brian
> > >
> > > -----Original Message-----
> > > From: Hannes Tschofenig [mailto:[email-masked]]
> > > Sent: Sunday, May 21, 2006 7:40 AM
> > > To: [email-masked]; [email-masked]
> > > Subject: [Geopriv] Explicit Indication of Location Object Consumer
> > >
> > > Hi James
> > > Hi Brian,
> > >
> > > do you plan to put additional info into the SIP message to indicate
> > who
> > > should consume the Location Object (explicity rather than implicit
> > info)?
> > >
> > > Here is an example: Assume that SIP UA Alice wants to give Bob
> > location
> > > information (via reference). Now, Alice could easily
> > indicate that it
> > > wants Bob to resolve the reference and to process the
> > location object.
> > > Stating this explicitly would prevent proxies to resolve it and to
> > > process the location object.
> > >
> > > Ciao
> > > Hannes
> > >
> > >
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