Re: [Sip] Thoughts on gateways, user=phone, and the Identity/DTLS-SRTP problem

[Dean Willis <dean.willis at softarmor.com>]

On Apr 18, 2008, at 4:38 PM, Ben Campbell wrote:

>
> On Apr 12, 2008, at 4:00 AM, Dean Willis wrote:
>
> [...]
>
>> If we made it mandatory for a PSTN gateway to assert identities using
>> user=phone and documented that Identity headers over an identity with
>> a user=phone parameter do not assert the "user part" of that  
>> identity,
>> then I think we'd have a complete solution.
>
> [...]
>
> I think you would need to extend that to be PSTN gateways that do  
> not do some sort of caller authentication. As we discussed  
> separately, it's perfectly possible for a PSTN gateway to require a  
> PIN from a caller, and therefore be able tp assert a stronger  
> identity than it could from caller id. In that scenario, would you  
> expect the "user=phone" parameter to apply?
>

How would you differentiate an an authenticating gateway from a non- 
authenticating gateway downstream?

--
Dean

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