accept Simultaneous-use from specific router

[issa rabba']

Dear all:   I had free radius server 0.9.3 running and every thing is going will, and the Simultaneous-use is working fine, I defined the Simultaneous-use to be 1, but I want to be allowed to skip simultaneous-use check when the radius request come from a specific router. Can I do that? Is it doable or not? If yes how can I do it?   Really if there I can do it will help me very much.   Thank for the help.