Cron job

Greetings,

I have a cloud FPBX server:
Debian 9.9
4.5.8
1.8.4 (64bit)

I would like a cron job to restart the freeswitch service once a week on sunday but am unsure of the correct syntax.

00**0 service freeswitch restart

would this be OK ?
 
OK, thanks for the help, I changed the job to run on a saturday and did this:

root@sip:~# crontab -e

0 0 * * 6 @weekly systemctl restart freeswitch

no crontab for root - using an empty one
crontab: installing new crontab

when I go back into crontab -e I see the command there so will wait till the weekend to see if it works.