答复: Re: Summary of Closing the offer/answer rollback issue?

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Explanation for Precondition notification

Precondition notification can be treated as part of the original modification triggered by Re-INVITE.

And only SDP with Precondition notification and without any other modification of session, during suspending state of session
modification, is called precondition notification.




OKUMURA Shinji <shin@xxxxxxxxxxxxxxx>

2009-03-02 17:43

收件人
sipping <sipping@xxxxxxxx>
抄送
"Christer Holmberg" <christer.holmberg@xxxxxxxxxxxx>, gao.yang2@xxxxxxxxxx, Gonzalo Camarillo <gonzalo.camarillo@xxxxxxxxxxxx>
主题
Re: [Sipping] Summary of Closing the offer/answer rollback issue?





Hi,

The following table describes my understanding.
Is this right?

signaling            | O/A state                      | media in use
---------------------+--------------------------------+--------------
init-INVITE/200/ACK  | audio1(met)                    | audio1
re-INVITE/183-rel    | audio2(notmet)                 | audio1
(PRACK/200OK)        | audio2(met)    +video1(notmet) | audio2
UPDATE/200OK         | audio2(met)    +video1(met)    | audio2+video1
UPDATE/200OK         | audio2(met)    +video2(notmet) | audio2+video1
4xx/ACK              |                                |
 Gonzalo's proposal | audio2         +video1         |
 Gao's proposal     | audio1         +video1(?)      |


Regards,
Shinji


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