[Freeswitch-users] can i set freeswitch to not using rctp mux?

hi there, i have a couple of soft phones using ordinary rtcp, thus using rtp port + 1, but fs uses rtcp mux which shares port with rtp, so every time the phone sends rtcp to fs results in getting "destination unreachable (port unreachable)", question 1: is that possible to have fs using ordinary rtcp? question 2: i also tried to have rtcp pass through fs by adding <param name="rtcp-audio-interval-msec" value="passthru"/> into the sip profile, but then the phone sends rtcp to fs but gets nothing, neither rtcp from the other side nor the "destination unreachable" from fs, what's the problem?