>> From: Jaiswal, Sanjiv >> 2)The is onging audio session between the agents . Now the terminating >> end wants to change from audio to video. Termination generates the >> reinvite with addition m lines for new audio and video and previous >> mline port set to zero (deletion of media). Peer on receiving the new >> offer simply rejects the SDP with the ports of all the m-line set tp >> Zero. >> In such scenario whether the previous audio session exists or the >> session is termination by sending BYE from the end point. > >The answer depends on whether the re-INVITE received a 2xx response or >not. If the response to the re-INVITE is 2xx, then the changed SDP >takes effect, and the previous audio session is ended (and there are >no new media sessions). If the response to the re-INVITE is 4xx, then >the changed SDP does not take effect, and the previous audio session >continues. > >Dale
Correct, though I'd add that if switching from audio to audio/video I would normally leave the first m= line in use (you can change codecs, even IP addresses & ports), and just add a video m= line. Remember you can never remove an m= line! When going from video to audio-only, you must use port 0 for the video line but leave it in the SDP. -- Randell Jesup, Worldgate (developers of the Ojo videophone) rje...@wgate.com _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
