Hi, I have two 2 FS connected this way: caller(g729) - FS1 - FS2 - calee(g711) Everything works fine, unless I set proxy_media on FS2. And I want to set it because I do not want to transcode twice (g729-linear-g729 and g729-linear-g711). So calee rings, sends 200OK to FS2 with correct SDP v=0 o=- 197090 197090 IN IP4 x.x.x.x s=- c=IN IP4 x.x.x.x t=0 0 m=audio 16392 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=ptime:20 a=sendrecv m=audio 0 RTP/AVP 4 101 13 and FS2 changes SDP this way and sends to FS1 v=0 o=- 157558 157558 IN IP4 x.x.x.x s=- c=IN IP4 x.x.x.x t=0 0 m=audio 16386 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=ptime:20 m=audio 0 RTP/AVP 4 96 13 a=rtpmap:96 /0 FS1, writes to log: sofia.c:1468 nua_i_media_error: unknown event 22: 988 Incomplete offer/answer and sends bye to callee and 500 No session set by user to caller. What should I do in this case? Is there any problem with SDP format? Thanks, M