Hi All, Looking for some debugging tips and comments on what might be causing the media port in the 200OK ( Answer message) to be set to 0 by freeswitch. Essentially it looks like data might be getting trampled somehow. Portion of 200OK going into Freeswitch m=audio 16416 RTP/AVP 18 100 101..a=rtpmap:18 G729a/8000..a=rtpmap:100 NSE/8000..a= fmtp:100 192-193..a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-15..a=ptime:20..a=sendrecv.. Portion of 200OK coming out of Freeswitch m=audio 0 RTP/AVP 96 100 101..a=rtpmap:96 G729a/8000..a=rtpmap:100 NSE/8000..a=fmtp:100 192-193..a=rtpmap:101 telephone-event /8000..a=fmtp:101 0-15.. Note the media port has been set to 0 and the rtpmap for G729 is also not correct. On receipt of this bad 200Ok the originator sends a BYE. We are using FS as a B2BUA with bypass_media set to true. Thus IMHO Freeswitch should not be touching the SDP portion of the message and just passing it through. This can reproduce this at will, so I can collect whatever data is nessicary. I have added the sofia debug from the console. Thanks, -- Jim Burke Director Evolutiontel. http://www.evolutiontel.net