HI,
I have this problem too. @Frank you solved your problem?
Freeswitch: 1.6.20 (64bit)
FusionPBX: 4.4.0
Debian: 9.4
freeswitch@fusionpbx> console loglevel 6
+OK log level 6 [6]
+OK console log level set to INFO
freeswitch@fusionpbx>
2018-04-10 16:13:55.931215 [NOTICE] switch_channel.c:1104...