1. Chart
By your rule, in A/B's view, UPDATE/200OK is after 4xx(/failure of Re-INVITE).
But in P-CSCF's view, UPDATE/200OK is before 4xx.
2. My proposal has no such problem.
Because: even if A/B/P-CSCF has different view of the order, but the state is decided by the property of Offer/Answer in UPDATE/200OK.
If the Offer/Answer is just "refresh precondition state table", it has no influence on the final session state.
If the Offer/Answer has modification, it is committed.
| OKUMURA Shinji <shin@xxxxxxxxxxxxxxx>
发件人: sipping-bounces@xxxxxxxx 2009-03-06 00:10 |
|
Gao,
AFAIK, providing aspecific service, P/S-CSCF and AS are defined as B2BUA.
>Yes. I agree with you.
>
>But I tried to give you one example(P-CSCF).
>
>The order of signals in P-CSCF's view can be different with UAC's view.
>
>For example, UPDATE and 200OK before 4xx. Then P-CSCF can have different session state.
>
>
>
>> Christer,
>>
>> >Hi,
>> >
>> >There are also "B2BUAs acting as proxies", that do not terminate the
>> >dialogs.
>>
>> "B2BUAs acting as proxies" is a terrible entities !
>> It should behave as B2BUA.
>>
>> Regards,
>>
>> Shinji
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