Consider backing up modified or new configuration files you created! FreeSWITCH™ is completely removed by deleting the /usr/local/freeswitch and /usr/local/src/freeswitch directories using the Finder (drag to trash) or in Terminal:
sudo rm -r /usr/local/freeswitch rm -r /usr/local/src/freeswitch
sudo rm -r /usr/local/*
NEVER delete the The /usr/local directory ! It's very difficult to recreate, it must be restored from a backup. This is can't be deleted due to System Integrity Protection (aka rootless) security.