Re: Comment on DERIVE and B2BUAs

On Oct 29, 2008, at 6:40 PM, Dean Willis wrote:

>
> On Oct 28, 2008, at 11:05 PM, Dan Wing wrote:
>>>
>>> Would the SBC not have to handle the SUBSCRIBE request locally?  
>>> After
>>> all, since it is a terminal UA for the call, it also knows
>>> about all the
>>> dialog states. The end-user UA would never even see the SUBSCRIBE.
>>
>> If that's a problem, just use some different method that goes end to
>> end.  The always-loved INFO comes to mind.
>
> What makes you think that INFO goes end to end? An SBC can absorb it  
> if it wants to.
>
> But this handling is not a bug, it's a feature. Since the SBC is  
> call-stateful, it knows about the outgoing call, and thus can  
> authoritatively say "Yes, this call was from Dan" without having to  
> congest your low-rate end-link.
>

Smells a lot like the "you break it you bought it" model for SBCs and  
RFC 4474.


> --
> dean
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