Hi, >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. So, what if I e.g. Also do a "codec refine" inside a precondition notficiation? Regards, Christer 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: 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 -------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. This mail communication is confidential. Recipients named above are obligated to maintain secrecy and are not permitted to disclose the contents of this communication to others. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. Any views expressed in this message are those of the individual sender. This message has been scanned for viruses and Spam by ZTE Anti-Spam system. _______________________________________________Sipping mailing list https://www.ietf.org/mailman/listinfo/sippingThis list is for NEW development of the application of SIPUse sip-implementors@xxxxxxxxxxxxxxx for questions on current sipUse sip@xxxxxxxx for new developments of core SIP
