Hi, Recently, I was involved in a project which is based on PJSIP, and I encountered a issue that we have some non standard SDP lines, (please refer to the last bolder line) v=0 o=Chen 1372821751 1372821751 IN IP4 192.168.77.109 s=Chen c=IN IP4 192.168.77.109 t=0 0 m=video 5055 RTP/AVP 102 a=rtpmap:102 H264/90000 a=sendonly f=v/2/5/0/1/0a/// I did not find any API which manage to construct this line, so I created a sdp then call pjmedia_sdp_print() to print the SDP into a buffer, then I just strcat(buffer, "f=v/2/5/0/1/0a///\r\n") and call pjmedia_sdp_parse() to construct the new sdp. But it seems does not work. Any one can give some comments? Thanks, Chenhui Xu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130703/cbc80226/attachment-0001.html>