VLAN ID based on VSAs

Hi, my first post here, a newbie question, thanks for your help. I'm going to set up two freeradius servers (2.1.7 on RHEL 5.5). ServerB will be connected to an AP and I want it to proxy all EAP requests to serverA (TTLS-PAP will be the only method accepted) which will do authentication using an OpenLDAP backend. My question: I'd like to configure serverA to include in the Access-Accept packet some AVPs which are specific to my Organization, like department_name, employee_role (I believe these are the so called VSAs), and I'd like serverB to perform some if-then-else logic on these VSAs to dinamically calculate the VLAN-ID to return to the AP. Is this possible (in a simple way)? Is it a common set up? Thanks, Stefano