On Mon, 2008-12-15 at 15:03 -0500, Dale Worley wrote:
> On Mon, 2008-12-15 at 11:26 -0500, Lawrence, Scott (BL60:9D30) wrote:
> > > If the proxy is already authorizing the request, could we not just
> > > check the p-asserted identity signature in the message instead of
> > > challenging it again?
> > 
> > As long as the PAI header signature is associated with the callid I see
> > no reason not to... is the PAI signature time-limited?
> 
> If we're going to treat PAI as equivalent to Authorization, why
> shouldn't we treat PAI, Authorization, and Proxy-Authorization as
> equivalent?

I'd like to preserve the ability to write things independently of our
equivalences.  The sipXtackLib support for authentication should
implement good practice for a SIP implementation, which includes knowing
which authorization headers you asked for and therefor which you attend
to.  

PAI is by defintion domain-specific, and so it's reasonable (and
efficient) for our services to take advantage of it when it's present.  


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