Just wanted to say, that when you do fresh install Freeswitch on Centos 7, `service freeswitch start` command may not work (for me it not worked twice). In this case you need to allow access for user `freeswitch` or group `daemon` access /etc/sysconfig/freeswitch

fro example, run `chown root:daemon /etc/sysconfig/freeswitch`