Re: [Sip] I-D Action:draft-ietf-sip-199-06.txt - early dialog state in proxy

[Bob Penfield <BPenfield at acmepacket.com>]

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>Yes, but the issue is how the proxy knows whether it has sent a 199 for the early 
>dialog indicated in the error response.

Again, the proxy needs to have a list of early dialogs and within that state data needs to remember whether or not a 199 has been sent/forwarded to the UAC.

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>The issue is whether the proxy can detect that a final response is generated by 
>another forking proxy, and therefor terminate more than one early dialog.

It does not matter whether the final response came from a forking proxy or not. When a final response is received on a client transaction, the proxy has to assume that all downstream forks that the request created have been terminated. RFC 3261 requires that the proxies and UASes send only one non-2xx final response, so any downstream proxy that forked the request would not send back a non-2xx final response until all of its forks completed.

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>Maybe the Via mechanism you describe works... I need to draw some figures :)
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