Subject: RE: [Sip] SIP WGLC of draft-ietf-sip-asserted-identity

From: "Drage, Keith (Keith)" <[email-masked]>
Date: Thu, 6 Jun 2002 12:33:00 +0100

Or using the most appropriate. After all, if you are asserting that this is the user, all the identities represent the same user. Thus at a PSTN gateway one would prefer to use a tel-url if available. In other cases one may prefer to use the sip-url.

Keith

> -----Original Message-----
> From: Elwell, John [mailto:[email-masked]]
> Sent: 31 May 2002 08:41
> To: 'Dean Willis'
> Cc: [email-masked]'
> Subject: RE: [Sip] SIP WGLC of draft-ietf-sip-asserted-identity
> 
> 
> Dean,
> 
> My motivation for saying it should not be allowed was that it 
> seemed to be
> implied elsewhere in the document - I wanted clarification. However,
> multiple identities of the same type might give a problem for 
> gateways, as
> you pointed out. I guess a gateway would just have to pick 
> one, e.g., the
> first.
> 
> Regards,
> 
> John
> 
> --------------------------------------------------------------
> John Elwell ([email-masked])
> Siemens Communications Limited,
> Technology Drive, Beeston,
> Nottingham NG9 1LA, UK
> Tel: +44 115 943 4989   Fax: +44 115 943 4969
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> 	Internet communications are not secure and therefore Siemens
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> contents of this message. Any views or opinions presented are solely
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> Communications Limited unless otherwise specifically stated.
> 
> 
> 
> 
> > -----Original Message-----
> > From: Dean Willis [mailto:[email-masked]]
> > Sent: 30 May 2002 21:58
> > To: 'Elwell, John'; 'sip'
> > Subject: RE: [Sip] SIP WGLC of draft-ietf-sip-asserted-identity
> > 
> > 
> > 
> > John Elwell pondered:
> > > Section 5, 3rd paragraph:
> > >    "The proxy MAY add a P-Asserted-Identity header field 
> > with either a
> > >    single SIP URI or a single SIPS URI.  Likewise, the 
> > proxy MAY add a
> > >    P-Asserted-Identity header field with a single tel URL."
> > > 
> > > This seems to imply that a proxy can add a header even if 
> > > there is already a header of the type concerned. Presumably 
> > > this should not be allowed.
> > 
> > Why?
> > 
> > There might be some issue with multiple tel URLs and gateway
> > interworking, but asserting multiple identities seems like a very
> > reasonable thing from a SIP perspective.
> > 
> > If you're a PGP user, you may well have multiple identities 
> associated
> > with one PGO key. There are practical reasons for doing this, and it
> > doesn't seem to cause any problems.
> > 
> > Different proxies or authentication servers might "know you" by
> > different identities and be able to assert those identities on your
> > behalf. It might also be reasonable to have multiple 
> > assertions for the
> > same identity, like multiple signers in PGP.
> > 
> > Signed,
> > 
> > [email-masked]
> > [email-masked]
> > [email-masked]
> > [email-masked]
> > 
> > Ad nasueatum . . .
> > 
> 
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