I am  using CentOS 7 and tried to start the freeswitch with systemctl start freeswitch.

It is working with freeswitch -nc but the systemctl start freeswitch is using the freeswitch:daemon user, a shown below

root@localhost bin]# systemctl status freeswitch.service
● freeswitch.service - freeswitch
   Loaded: loaded (/usr/lib/systemd/system/freeswitch.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Thu 2019-11-21 09:05:16 EST; 8s ago
  Process: 4251 ExecStart=/usr/bin/freeswitch -u freeswitch -g daemon -ncwait $DAEMON_OPTS (code=exited, status=1/FAILURE)
  Process: 4249 ExecStartPre=/bin/chown -R freeswitch:daemon /var/run/freeswitch/ (code=exited, status=0/SUCCESS)
  Process: 4248 ExecStartPre=/bin/mkdir -p /var/run/freeswitch/ (code=exited, status=0/SUCCESS)

Nov 21 09:05:16 localhost.localdomain systemd[1]: freeswitch.service: control process exited, code=exited status=1
Nov 21 09:05:16 localhost.localdomain systemd[1]: Failed to start freeswitch.
Nov 21 09:05:16 localhost.localdomain systemd[1]: Unit freeswitch.service entered failed state.
Nov 21 09:05:16 localhost.localdomain systemd[1]: freeswitch.service failed.
Nov 21 09:05:16 localhost.localdomain systemd[1]: freeswitch.service holdoff time over, scheduling restart.
Nov 21 09:05:16 localhost.localdomain systemd[1]: Stopped freeswitch.
Nov 21 09:05:16 localhost.localdomain systemd[1]: start request repeated too quickly for freeswitch.service
Nov 21 09:05:16 localhost.localdomain systemd[1]: Failed to start freeswitch.
Nov 21 09:05:16 localhost.localdomain systemd[1]: Unit freeswitch.service entered failed state.
Nov 21 09:05:16 localhost.localdomain systemd[1]: freeswitch.service failed.