Accounting base on the zones behind CP

[nizzard0094]

i want to setup a CP with 2 zones behind it

zone are internet and a media server

so when a user enter the captive portal and use the internet his internet usage start dropping ( his data shrink ) but not his media server usage

and the same if he use media server his media server usage drops

so if he is downloading something from the internet and watch something from the media server in the same time
his internet usage won't effect his media usage

every usage his its own counter

can pfsense CP do this ?
is their a name to search to find how to do this ?
can radius server do this type of accounting ?
how to do this ?
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