Scott Lawrence wrote:
> Well, if we're going to try to come up with the "right" solution (worth
> discussing, certainly)...
> 
> I think that HttpMessage (and therefor SipMessage) should provide two
> methods:
>         
>         getAuthorizationHeader 
>                 that iterates over values of the Authorization header
>                 for use by user agents.
>         
>         getProxyAuthorizationHeader
>                 that iterates over values of the Proxy-Authorization
>                 header for use by proxies.
>         
> then something in sipXcommserverLib should provide higher level methods
> that add the handling of a sipXecs PAI header on top of those:
> 
>         getAuthorization 
>                 For user agents.
>         
>         getProxyAuthorization
>                 For proxies.
> 
> These are also iterators, that return true/false to indicate if a "next"
> identity is returned.  Each should look first for a PAI header with a
> valid sipXecs signature; if that is found, it's the only identity this
> method will return.  If no PAI is present, then they revert to iterating
> over the appropriate header above.

This will work for the dialog-initiating SUBSCRIBEs. In-dialog SUBSCRIBEs, 
however, will not have a PAI header (but, they will have the 
Proxy-Authorization header). Hence, the status server will be forced to 
challenge them.. Now, I am not sure if the phones would choke on that or not. 

OTOH, in the status server, we expire the nonce after 5 mins, hence we may end 
up challenging re-SUBSCRIBEs regardless of whether we look for the 
Proxy-Authorization header or not.

I am doing the tests right now. Will update you on the results.

Arjun
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