Question on Cisco-AVPair = "device-traffic-class=voice"

Hi,   Is there a way that freeradius can tell it is a VOICE device?  Like ACS server: Cisco-AVPair = "device-traffic-class=voice".   Here is a link to IP Telephony In IEEE 802.1X ... http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/con...   Thanks a lot, Hangjun