Hi Christer,
In my opinion,the re-INVITE should fallback to the state before the re-INVITE.
And it doesn't matter what the precodition state is. Because the re-INVITE is
rejected,the state of its precondition state seems useless.
By limiting UDPATEs for new modification outside re-INVITE,we can find the
right state to fallback.
What do you think about this?
Best wishes,
Eric.wang
"Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx> 写于 2009-02-19 03:24:04:
> Hi,
>
> Let's look into this precondition proposal.
>
> There are some issues that needs to be taken into consideration.
>
> Issue 2:
> -----------
>
> Assume I send a re-INVITE, and I use precondition. I modify the SDP,
> and indicate that preconditions are not met.
>
> Then I receive a relaible 18x, and the first offer/answer
> transaction has succeeded.
>
> Later I send an UPDATE request, where I indicate that preconditions are met.
>
> Then I receive a 200 for the UPDATE, indicating that preconditions
> are met also at the other end.
>
> Then the re-INVITE fails. Now, according to the ZTE proposal, is
> there a full fallback? The UPDATE was sent as part of the nested
> precondition procedure, but the preconditions were fullfilled before
> the re-INVITE failed?
>
> Does it matter what the precondition state is when the re-INVITE
> fails, or is there always a full fallback?
>
> Regards,
>
> Christer
>
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