Hi All, I was hoping someone has come across this issue and found a fix for it or can point me in the right direction. In the PABX I am connecting to I cannot hear the person who called me but they can hear me. Debugging a bit more, it seems like the cause is because in this PABX it does not include the SDP in the initial INVITE message. The SDP is sent much later. I have another SIP client and it has no problem handling this. I have attached two logs. One log is where the SDP is not in the initial INVITE (connecting to the PABX which has this characteristics). In this case there is no voice path in Siphon. The second log is to another test PABX where the SDP is included in the initial INVITE. In this case there is no issue with voice paths in Siphon. Is this a known issue with PJSIP? Regards, Rukshan. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100412/292210ee/attachment-0003.html> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: no sdp in invite.txt URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100412/292210ee/attachment-0002.txt> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100412/292210ee/attachment-0004.html> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: sdp in invite.txt URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100412/292210ee/attachment-0003.txt> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100412/292210ee/attachment-0005.html>