Yes. If we accept view 1, there would be some backward compatible problem. And this is a change to RFC3311.
I am waiting for more comments from people want to keep RFC3311 from re-write.
Gao
"Eric.wang" <eric.wangxr@xxxxxxxxx> 写于 2009-03-09 20:05:51:
> Hi,
>
> I support view 2,not all update can be considered as sub-transaction
> of re-INVITE.
> According to current RFCs, it’s NOT proper to consider all UPDATEs
> as re-INVITE’s sub-transaction
> Eg:
> UPDATE nested in re-INVITE for target refresh can’t be considered
> as sub-transaction.
> There are two thought about "UPDATE during Re-INVITE". Which one is
> better or suits for current RFCs
>
> There are two thought about "UPDATE during Re-INVITE".
>
> 1. All UPDATEs during Re-INVITE are Re-INVITE's sub-transaction
> RFC3312(Precondition) is a case. As there is such case, we can
> making all UPDATEs during Re-INVITE as Re-INVITE's sub-transaction.
>
> 2. Not all UPDATE(during Re-INVITE) can be considered as sub-
> transaction of Re-INVITE
> There is really need nested-modification, such as precondition and
> more in the future. But the cascade of nested transaction should be
> defined in application-level, not signal-level. So, it is better to
> make Re-INVITE and UPDATE separatly expect for definition such as
> precondition. And this obeys current definition of RFC3311.
>
> In RFC3311, when the UPDATE is accepted by the other
> side(UPDATE/200OK), the change of states is committed and effort at
> once. And making all UPDATEs during Re-INVITE as Re-INVITE's sub-
> transaction can be violation of RFC3311. So, we shold not treat all
> UPDATEs during Re-INVITE as Re-INVITE's sub-transaction.
>
> While UPDATE/200OK just refresh "precondition state table" in
> RFC3312("precondition state table" is modified at once, so this
> obeys RFC3312), having no impat on the commitment of modification
> triggered by Re-INVITE, these UPDATE/200OK can be treated as sub-
> transaction of Re-INVITE.
> Other UPDATE/200OK can not be treated as sub-transaction of Re-INVITE.
>
> Comments/feeling are welcome!
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