Re: [Sip] RFC 4474 and PSTN

["Elwell, John" <john.elwell at siemens.com>]

Hannes,

Personally I think there will be occasions when knowing that media is
secured as far as a known PSTN gateway can be useful, so signing by the
gateway I think can still have some value. One way to achieve this would
be with an email-style SIP URI for the gateway. So I guess the questions
are:

1)Whether there is any value in a gateway signing with an E.164-based
SIP URI, e.g., sip:+123456789 at gateway.example.org;user=phone, and if so
whether this needs a qualifier such a source=PSTN.

2) Whether there is any value in a qualifier such as source=PSTN even in
the absence of an RFC 4474 signature.

John

> -----Original Message-----
> From: Hannes Tschofenig [mailto:Hannes.Tschofenig at gmx.net] 
> Sent: 04 April 2008 09:51
> To: Elwell, John
> Cc: sip at ietf.org
> Subject: Re: [Sip] RFC 4474 and PSTN
> 
> I would instead not put the SIP Identity header there.
> No additional work needed.
> 
> Ciao
> Hannes
> 
> Elwell, John wrote:
> > There seems to be some interest in adding some indicator to 
> the URI or
> > to the header field to warn of the limited guarantee of 
> authenticity or
> > the opposite (i.e.,lack of such an indicator would mean the 
> guarantee is
> > low, i.e., the identity has not been verified).
> >
> > I think on this issue it is just a matter of somebody putting things
> > together into a draft. I think Dean and/or Adam were the 
> main initiators
> > of this proposal - something like a source=pstn parameter. Would
> > somebody care to author a draft? Or do we need further discussion?
> >
> > John
> > _______________________________________________
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> > Use sipping at ietf.org for new developments on the application of sip
> >   
> 
> 
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