Yes. Your Vox VoIP service comes with a default call limit of R1500.00pm.
This resets to zero on the 1st of each month. You can always top this up if you hit your call limit during the month but this can be a hassle.
We suggest that if you expect that you will call more than this amount during any month that you send an e-mail now to email@example.com with a limit increase request and the amount you would like to raise this limit to.