option 82

Hi, I work at an ISP and we are looking at the possibility to use option 82 in FreeRADIUS. The other side is going to send us an ordernumber and then we want to send a configuration back (an ip address etc.). Been searching how to do this in FreeRADIUS, but haven't found much useful information. So, if somebody can point me in the right direction on how to set it up in FreeRADIUS. Any help will be greatly appreciated. Gr, Kevin