答复: Re: About "rollback of re-Invite" - case with preconditions met when reINVITE fails

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WangLiBo135681/user/zte_ltd

2009-02-19 08:33

收件人
"Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx>
抄送
gao.yang2@xxxxxxxxxx, sipping@xxxxxxxx
主题
答复: Re: [Sipping] About "rollback of re-Invite" - case with preconditions met when reINVITE fails链接






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.


[gaoyang] I agree with Wang Libo here.

By limiting UDPATEs for new modification outside re-INVITE,we can find the

right state to fallback.


[gaoyang] It is BCP thing. And the solution in theory can solve it, even if UPDATE/200OK
with Offer/Answer is a new modification during Re-INVITE.

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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