Thanks for the quick reply, Here's the Wireshark capture. As you can see, we added a connection line in the second media, even though it's optional. And we don't have any video codec. I want to know if we're obliged to have at least one ? Fran?ois Roseberry _________________________________________________________________ R?unissez-vous avec les gens qui vous sont proches- clavardez face ? face gr?ce ? Messenger. http://go.microsoft.com/?linkid=9650743 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090325/e98c397e/attachment-0001.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: capture.pcap Type: application/octet-stream Size: 27222 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090325/e98c397e/attachment-0001.pcap>