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 |
|
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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