| "Christer Holmberg"
<christer.holmberg@xxxxxxxxxxxx>
2009-02-16 19:35 |
|
Comments in line.
Thanks.
Gaoyang
Hi,
>I also pay high attention to the topic of "rollback of re-Invite".
>As lots of service is implemented on the network using SIP, and
different ways
>may be carried out by different corporations, it's necessary to define
a complete
>and clear method to solve the failure when the unsuccessful re-Invite
happens.
I agree, and we thought that having a generic rule, not related to
specific use-cases, would be the most clear, clean and complete
solution.
[gaoyang] It is simple and clear. But it disregard nature property of nested transaction. I concluded incorrectness and drawback of such way. More details in http://www.ietf.org/internet-drafts/draft-gaoyang-sipping-session-state-analysis-01.txt.
>And the problems "Commit any session parameters that have been
sucessfully changed"
>metioned in "draft-gaoyang-sipping-session-state-analysis-01.txt" need
further discuss,
>I think.
The draft does not define a generic rule. It more or less says that
every time there is a new use-case, the offer/answer rollback aspects
needs to be documented for that use-case. I think that is something we
wanted to avoid.
[gaoyang] It is not use-case oriented, but rules/definition oriented.
And the definition of how o/a pairs form nested transaction should be open for future.
Such as "a=chain" and so on extension can form more o/a pairs as nested transaction. It is not use-case.
We can have a further talk.
If I understand chapter 4.3.3 correct, it says that if you have a
pending re-INVITE transaction, a NEW modification must be sent in a
re-INVITE request. That way we would get rid of the race condition
problem. That is an interesting point. I guess the question is whether
it's too lake to make such a rule.
[gaoyang] Is the "lake" late? I think it can be BCP, not rules :).
Regards,
Christer
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