Using FS10.5 installed from packages on Debian Stretch...
I wanted to replicate the behavior we had with <param name="rtp-timeout-sec" value="300"/> so that we'll hangup calls in which leg B of a conference has sent no media for 5 mins.
I edited our dialplan like this...
<action application="conference_set_auto_outcall"
data="['conference_member_flags=endconf,jitterbuffer_msec=5p:100p,media_timeout=300000']sofia/gateway/...deleted..."/>
and restarted like this...
fs_cli -x 'fsctl shutdown elegant restart'
But after 8 mins in such a call there was no hangup.