Well, it is a little hard to be crisp and clear about the usage of 4474 
with "numbers" when we don't know what a "number" is, nor do we know 
when we have one.
So I am not sure that your stated goal is achievable without first 
solving some other problems.

Yours,
Joel M. Halpern


Jonathan Rosenberg wrote:
> Actually what I am hoping to do is to just clearly document the 
> applicability of RFC4474 to numbers and be much crisper with guidance on 
> when to use it, when to not, what it buys you with numbers (since it 
> does help a little even then - receivers can know the domain that 
> asserts that number and use blacklists/whitelists to judge trustability).
> 
> I also want to make sure we are not basing SRTP security on integrity 
> properties delivered with RFC4474, when said properties aren't really 
> delivered so well with phone numbers.
> 
> -Jonathan R.
> 
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