Re: [Sip] Perspectives for E.164 ownership

[Paul Kyzivat <pkyzivat at cisco.com>]

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. 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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