Just check
etc/fusionpbx/config.conf
And see if settings are good if using default or RAM drive
#database
database.1.type = pgsql
database.1.host = 127.0.0.1
database.1.port = 5432
database.1.sslmode=prefer
#switch settings
switch.conf.dir = /etc/freeswitch
switch.sounds.dir = /usr/share/freeswitch/sounds
switch.database.dir = /var/lib/freeswitch/db
switch.recordings.dir = /var/lib/freeswitch/recordings
switch.storage.dir = /var/lib/freeswitch/storage
switch.voicemail.dir = /var/lib/freeswitch/storage/voicemail
switch.scripts.dir = /usr/share/freeswitch/scripts
#switch xml handler
xml_handler.fs_path = false
xml_handler.reg_as_number_alias = false
xml_handler.number_as_presence_id = true