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Currently a container with a jessie debian (under a stretch host).

Freeswitch should run in privilegied mode ;

lxc config set my_freeswitch_container security.privileged true

See https://freeswitch.org/confluence/display/FREESWITCH/Debian+8+Jessie

But I did install only a minimum system :

apt-get update && apt-get install -y \
freeswitch-mod-console \
freeswitch-mod-logfile \
freeswitch-mod-cdr-csv \
freeswitch-mod-event-socket \
freeswitch-mod-sofia \
freeswitch-mod-loopback \
freeswitch-mod-commands \
freeswitch-mod-dptools \
freeswitch-mod-expr \
freeswitch-mod-dialplan-xml \
freeswitch-mod-spandsp \
freeswitch-mod-hiredis \
freeswitch-mod-sndfile \
freeswitch-mod-native-file \
freeswitch-mod-local-stream \
freeswitch-mod-tone-stream \
freeswitch-mod-timerfd \
freeswitch \
freeswitch-systemd \
libesl-perl

originate  sofia/gateway/mysipprovider/0033484253887   &bridge(sofia/internal/703%frees.couderc.eu)  XML  int.example.ne