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Re: [Sipping] Summary of Closing the offer/answer rollback issue?
Hi,
>I think so now. And you can ask Gonzalo if he think it is the only branching.
>
>But I want to know that if I or someone else find new branching, can it be talked?
I am not sure what you mean by "be talked", but I think we need a full picture of the alternatives, and the difference between them.
Regards,
Christer
"Christer Holmberg" <christer.holmberg at ericsson.com>
2009-03-02 15:00
收件人
<gao.yang2 at zte.com.cn>
抄送
"Gonzalo Camarillo" <gonzalo.camarillo at ericsson.com>, "Hadriel Kaplan" <HKaplan at acmepacket.com>, "sipping" <sipping at ietf.org>, <sipping-bounces at ietf.org>
主题
RE: RE: RE: Re: [Sipping] Summary of Closing the offer/answer rollback issue?
>>Then that is: Considering RFCs, "refine codecs" is "a new modification".
>>
>>Not considering "evolution and extension", it is still a solution without any violation of RFCs.
>
>Yes, but that was not the point. I am trying to figure out what the differences between the proposals are.
>
>[Gao] Yes.
>
>But what I think important for "evolution and extension" is nested transaction. And if using something like "a= chain"(RFC3108) in Offer/Answer, nested transaction concept can be more
>effective.
Yes, but we can have "something likes" - we need clear rules.
>So, again: is the "late commitment" currently the ONLY difference between yours and Gonzalo's proposals, or is there something else?
>
>[Gao] IMO, "Late commitment" is the most important branching for current SIP/SDP usage.
That is not what I asked.
Regards,
Christer
"Christer Holmberg" <christer.holmberg at ericsson.com>
2009-03-02 14:21
收件人
<gao.yang2 at zte.com.cn>
抄送
"Gonzalo Camarillo" <gonzalo.camarillo at ericsson.com>, "Hadriel Kaplan" <HKaplan at acmepacket.com>, "sipping" <sipping at ietf.org>, <sipping-bounces at ietf.org>
主题
RE: Re: [Sipping] Summary of Closing the offer/answer rollback issue?
Hi,
Again, I strongly do NOT think we should choose an "evolution and extension" approach, and let organizations decide what is a new modification, and what isn't. Again, you can have entities which belong to DIFFERENT organizations´communicating with each other, and those should have a common understanding of the rules.
If you have a closed network, where you know that every entity belongs to a single organization, you can of course do whatever you want. But, in that case you don't need to standardize it.
Regards,
Christer
________________________________
From: gao.yang2 at zte.com.cn [mailto:gao.yang2 at zte.com.cn]
Sent: 2. maaliskuuta 2009 5:47
To: Christer Holmberg
Cc: Gonzalo Camarillo; Hadriel Kaplan; sipping; sipping-bounces at ietf.org
Subject: 答复: Re: [Sipping] Summary of Closing the offer/answer rollback issue?
My draft is open for evolution and extension. My view is that:
Considering RFCs, "refine codecs" is "a new modification". And if some one(org/operator/internal usage) think "refine codecs" is part of the original modification. It still can assure its session state by nested transaction concept.
Some custom-built one really treated it as part of the original modification.
"Christer Holmberg" <christer.holmberg at ericsson.com>
发件人: sipping-bounces at ietf.org
2009-03-02 05:30
收件人
"Hadriel Kaplan" <HKaplan at acmepacket.com>, "Gonzalo Camarillo" <gonzalo.camarillo at ericsson.com>, "sipping" <sipping at ietf.org>
抄送
主题
Re: [Sipping] Summary of Closing the offer/answer rollback issue?
Hi Hadriel,
I guess Gonzalo will provide his summary soon, but I don't think there
is currently a disagreement regarding pre-conditions. You call them
"conditional offers", Gao calls them "notifications", but that's just
wording... :)
I think the one of the main issues at the moment is what happens after
preconditions have been met on both sides:
1) Is the change now commited/in-use, and a re-INVITE failure would not
change that? <----- "in-use"
alternative
OR
2) Would a re-INVITE failure cause a fallback (this is what is meant by
"late commitment")? <---- "late
commitment" alternative
If preconditions have NOT been met, and the re-INVITE fails, I think
most agree that there will be a rollback to the "last committed state".
Gao's draft also talk about other changes which would not be considered
as "real" SDP offers, for example if you reduce codecs. But, at least I
strongly prefer NOT to go into such details, because that would for sure
cause interop issues. I am not sure what Gao's view on that is at the
moment, though?
Regarding the race condition, I think we can avoid that with some BCP-
and guidance text.
Regards,
Christer
-----Original Message-----
From: Hadriel Kaplan [mailto:HKaplan at acmepacket.com]
Sent: Saturday, February 28, 2009 5:26 PM
To: Christer Holmberg; Gonzalo Camarillo; sipping
Subject: Summary of Closing the offer/answer rollback issue?
Is there an email in this long thread that summarizes the issues?
It's impossible to follow this thread. :)
I'm not clear on what the issues are with pre-conditions that make
failed offers concept break. To me, pre-conditions are basically not
real SDP offers; they're conditional offers. Until the *all* the
conditions are met, it's not "committed". You continue using the last
committed state. I know there are race conditions, but considering how
rare pre-conditions are in the real world (especially in re-Invite's),
that I'm having trouble imagining why we should care about corner cases
of such. Regardless, I vote for any fixing that needs to happen because
of pre-conditions should be around changing pre-condition logic, even if
it means completely re-writing how pre-conditions works - don't change
normal SIP or SDP. (not that anyone is proposing it, I just can't tell
form this thread)
Re-Invites and SDP offer/answer have so many interop issues in the wild
even without pre-conditions, that this whole thread scares me. :(
-hadriel
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