Handling Radius Events with Client

Hi to all, Let's say we have a switch and two (free) Radius servers backing up each other. I want to implement a client, that listens to the call-related events (such as accest-accept, call started, call finished, failed, and etc.) received from the target Radius server, and process these data based on some rules. Here comes my questions: 1. Is it possible to handle Radius call-relaed events over UDP or TCP? -- because i am newbie to the subject, please excuse me if i am asking something stupid. 2. If it's, how? Any sample source code can be provided? Thank you and regards, Ali Koyuncu R&D Director "I'm not Anti-Business, I'm Anti-Idiot! (Dilbert)"