Re: [Sip] Comment on DERIVE and B2BUAs

[Victor Grinberg <VictorG at xcastlabs.com>]

On Tue, 2008-10-28 at 18:39 -0400, Nasir Khan wrote:
> Yes, obviously RFC 4474s mechanisms end at a B2BUA because the B2BUA
> effectively starts a new call (from the UAC side). 
> In fact the B2BUA cannot even provide a new Identity header if the
> From header remains unchanged because the Contact would typically be
> specific to the B2BUA and the private key for senders domain is
> unknown to this B2BUA. 
>  
> It however is not as bad as it sounds because typically B2BUAs (SBCs
> in particular) would be within the final UASs trust domain. 
>  


In practice SBC is most likely a third-party piece of hardware/software
with it's own functionality and most likely do not have access to local
trust domain database.

--
VictorG



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