| "Christer Holmberg"
<christer.holmberg@xxxxxxxxxxxx>
2009-03-02 14:30 |
|
>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.
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.
Regards,
Christer
"Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx>
2009-03-02 14:21
收件人
<gao.yang2@xxxxxxxxxx>
抄送
"Gonzalo Camarillo" <gonzalo.camarillo@xxxxxxxxxxxx>, "Hadriel Kaplan" <HKaplan@xxxxxxxxxxxxxx>, "sipping" <sipping@xxxxxxxx>, <sipping-bounces@xxxxxxxx>
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@xxxxxxxxxx [mailto:gao.yang2@xxxxxxxxxx]
Sent: 2. maaliskuuta 2009 5:47
To: Christer Holmberg
Cc: Gonzalo Camarillo; Hadriel Kaplan; sipping; sipping-bounces@xxxxxxxx
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@xxxxxxxxxxxx>
发件人: sipping-bounces@xxxxxxxx
2009-03-02 05:30
收件人
"Hadriel Kaplan" <HKaplan@xxxxxxxxxxxxxx>, "Gonzalo Camarillo" <gonzalo.camarillo@xxxxxxxxxxxx>, "sipping" <sipping@xxxxxxxx>
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@xxxxxxxxxxxxxx]
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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-------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. This mail communication is confidential. Recipients named above are obligated to maintain secrecy and are not permitted to disclose the contents of this communication to others. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. Any views expressed in this message are those of the individual sender. This message has been scanned for viruses and Spam by ZTE Anti-Spam system.
_______________________________________________ Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip Use sip@xxxxxxxx for new developments of core SIP
