Hi, I'm trying to do a POC using FS, the goal is to have FS handle REFERs containing proprietary data. I want to have some logic on top of FS and also use the fail over mechanism. in short, I have something like this: (third party) A side --- FS ---- B side (IVR server) the IVR the sends a REFER to FS. I don't want A to deal with it. now say B refers to C, it would be considered as a "group" C1, C2 ... to which I want FS to failover. only when one has answered should A be updated (REINVITE) and B notified and disconnected. if all fails I would expect B to be notified of the failure and proceed as I wish without "losing" A. from what I've read FS should be OK for the job but I have a couple issues: 1 ) I have some issues getting FS handle a REFER while in bypass-media mode. (I tried with the release and some revisions including latest) first when I bridge A and B everything is fine and media is bypassed. When B sends REFER to C: - FS immediately NOTIFY B of success and send a reinvite to A with SDP containing its own media IP/port. - then it does INVITE C with A's SDP. - B gets disconnected. A is not updated with C's sdp. so at this point A sends RTP to FS and C sends RTP to A. ... I basically have one extension for B: (set bypass-media and bridge to B) and another extension to C which does the same actions. what do you think I do wrong? 2 ) how can I catch the REFER and set variables from it? (like ref-by or ref-to) in the dial plan I do catch the INVITE sent to C, but how to do it with the REFER itself? thanks for your help! Best Regards, Victor.