dictionary per nas

Hi @all, I want to replace our old CiscoSecure Radius-Server to a new version of FreeRadius (2.1.8). I´ve checked several things but one thing I miss on FreeRadius: On CiscoSecure it was possible to bound a NAS to a dedicated dictionary. I need this feature now on the FreeRadius I need that because I want to use one user-account for different NAS and set different reply-attributes for each NAS. Do anyone have an idea how to do this with FreeRadius ? Regards Marcus