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 _______________________________________________ Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip Use sip@xxxxxxxx for new developments of core SIP
