Re: [sipcore] Bad Location Information in draft-ietf-sipcore-location-conveyance-03

Like James notes, intermediaries have always had the power to block  
any request they please (e.g., with the 401 Unauthorized header).  In  
the case of location, the concern you note is just one more motivation  
for proxies to keep their hands off my INVITE; I don't think there's a  
technical solution.

On Jul 22, 2010, at 3:50 PM, Alissa Cooper wrote:

> Section 4.2 of draft-ietf-sipcore-location-conveyance-03 says:
>
>   A SIP intermediary can also reject a location it receives from a
>   Target when it understands the Target to be in a different location.
>   The proper handling of this scenario is for the SIP intermediary to
>   include the proper location in the 424 Response.  This SHOULD be
>   included in the response as a MIME message body (i.e., a location
>   value), rather than as a URI; however, in cases where the
>   intermediary is willing to share location with recipients but not
>   with a user agent, a reference might be necessary.
>
> Does this leave the Target's ability to spoof its location up to the  
> discretion of the SIP intermediary?
>
> Thanks,
> Alissa
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