Re: Review of draft-kuthan-sip-derive-00

> -----Original Message-----
> From: Adam Roach [mailto:[email protected]]
>
> I'm not saying "stop changing Call-IDs." It's true that that's what I
> *want* to happen, but it's not the only way this can be made to work.
>
> I'm saying "if you must, for business reasons, change Call-IDs going
> into and out of a network, make sure you perform the same mapping into
> and out of the network when you see the dialog event package." Again,
> this is something with value for the carrier itself, as it allows new
> services (such as call completion).

Ohhh.  But that's not the problem.  At least I hope that's not what people are talking about.  Most B2BUA's will map them back just fine.  The issue is your message may not go through *that same* B2BUA.
If the message is in-dialog, no problem.
If the message is out-of-dialog but uses the Contact-URI to route to, no problem (because the b2bua's replace that to be themselves). [note: gruu's can screw that up, but oh well]

The problem is if you send it to an *AoR*, such as the From-URI of another message, there's no guarantee it will go through the same sets of b2bua's to get fixed hop-by-hop.

-hadriel
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