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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#4F81BD'>Hi all,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>I am answering a SIP call made to my softphone. The softphone rings and also sends a 200 OK correctly. But the other end that made the call is seeing a failure in the SDP of the 200 OK packet.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><div style='border:none;border-left:solid #E5E5E5 1.0pt;padding:0cm 0cm 0cm 11.0pt'><pre style='line-height:13.5pt;background:white;vertical-align:baseline'><span style='color:#4F81BD'>This error is seen in SDP header => </span><span style='color:#555555'>Invalid SDP line (no '=' delimiter) error<o:p></o:p></span></pre></div><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>w.r.t w_frame4_public_ip.pcap It looks like the failure as seen in wireshark is because line “audio 5000 RTP/AVP 8 101” should really be “m= audio 5000 RTP/AVP 8 101”<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>so it doesn’t see the ‘=’ delimiter.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>But if you look at w_frame52_local_ip.pcap, the packets sent from the local IP has the contents correct.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>It is only after passing the public IP and at the network premises, that this failure is reported by the Session Border controller.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>I am not able to understand why a correctly formed packet sent out is seen “corrupted” at the network end.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>Any ideas really appreciated.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#4F81BD'>Badri.<o:p></o:p></span></p></div></body></html>