Re: [Sip] Comment on DERIVE and B2BUAs

[Dean Willis <dean.willis at softarmor.com>]

Elwell, John wrote:
> Viktor,
> 
> An interesting draft addressing a known problem space. Dan Wing has
> already pointed out similarities with draft-wing-sip-e164-rrc (now
> expired). I fear the present draft will not work in the presence of
> B2BUAs along the path of the INVITE request, since these tend to
> change things like call-ID, to-tag and from-tag. Since B2BUAs, and
> SBCs in particular, are the main reasons why RFC 4474 will not work,
> any solution has to be able to work through these devices.
> 

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.

So the SBC's lack of transparency on tags, etc. is irrelevant.

--
Dean
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