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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