billing using radius

[Eric]

Hi,
I use freeradius server  for accounting of vpn users.I use monthly counter
to limit users but now I want if user's traffic is rather than specific
amount, I will be  able to have billing for them and to disconnect some of
them. Is it possible to have billing with config in freeradius or a new
software is needed?
could radius disconnect users based on amount of traffic not counters?
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