Re: [Ecrit] FW: [Geopriv] Winterbottom-ecrit-direct considered

[Marc Linsner <mlinsner at cisco.com>]

James W.,

On 10/27/09 3:53 PM, "Winterbottom, James" <James.Winterbottom at andrew.com>
wrote:

> Hi James,
> 
> It is not unauthenticated, the device must have access to an Internet feed,
> and that feed is always registered or authenticated in some fashion.
> 
> One of the key proposals of this draft is that the calling device, and please
> do not think phone, think computing device (which might be a game console)
> does register with the ESRP. This relatively short-term registration is the
> way in which call-back is attained. The registration can also be used by the
> ESRP to check that the caller is in fact in the calling domain of the PSAP or
> at a minimum where the point of presence in the access network is.
> 

What is different in the registration process that allows "the ESRP to check
that the caller is in fact in the calling domain of the PSAP" that can't
happen via a SIP invite (with no registration)?

Thanks,

-Marc-