Re: [Sip] Perspectives for E.164 ownership

["Dan Wing" <dwing at cisco.com>]

> -----Original Message-----
> From: Paul Kyzivat [mailto:pkyzivat at cisco.com] 
> Sent: Monday, August 25, 2008 2:42 PM
> To: Dan Wing
> Cc: 'SIP IETF'
> Subject: Re: [Sip] Perspectives for E.164 ownership
> 
> 
> 
> Dan Wing wrote:
> > It seems that asking the question "Who do you think owns 
> +1.408.555.1234" of a
> > bunch of network elements could be an interesting way to 
> approach SIP's "Who
> > owns a certain E.164" problem.
> > 
> >   "Improving SSH-style Host Authentication with Multi-path 
> Network Probing"
> >   http://www.cs.cmu.edu/~perspectives/
> >   http://www.cs.cmu.edu/~perspectives/perspectives_usenix08.pdf  
> > 
> > Thoughts?
> 
> Hmm... seems like there is a bootstrapping problem.
> At the moment, there must be in excess of a billion E.164 numbers in 
> use.

We don't care about those.  We only care about the ones that have
SIP endpoints and which we can establish strong cryptographic
identity -- not the ones connectable via a PSTN gateway.

-d


> But most network elements have no clue who owns any of them.
> Most PSTN GWs don't know. I suppose the major SPs are in a 
> position to 
> figure it out, but are they willing to say?
> 
> I might eventually decide I know for a particular E.164 after having 
> received a call from it and decided its the right person. But that's 
> leap of faith again. And then its only me that knows, which 
> won't help 
> most other callers. And what I "know" will be the domain name that I 
> get, which may the be the true one due to SBCs.
> 
> So I'm missing some piece of how this could be helpful.
> 
> 	Thanks,
> 	Paul

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