Setting different IDLE-TIMEOUTS based on IP Address

Hi, So I have done a fair amount of RTFM'ing and search engining but am stumped. Perhaps someone on this list has successfully done what we are trying to do: Have our FreeRADIUS Server assign a different IDLE-TIMEOUT Value based on what IP Address is contacting the RADIUS server. OS: CentOS 5.8 FreeRADIUS Version: 2-2.1.12-4.el5_8 We have FreeRADIUS working fine (it has been a rock in fact and is running under Daniel Bernstein's daemontools). We just need to add this functionality as some of our network gear needs to have a different IDLE TIMEOUT than others. Is this possible? Thanks much, Jg