[Freeswitch-users] Hangup after originate?

Hello, I plan to call Originate API from managed ESL (.NET). 1. How can I detect if a call isn't answered (it keeps ringing on the other end) for say 2 minutes? I would like the command to end the call after that much time. 2. How do I listen to events (say I fire Originate and then would like to know sequence of events happening regarding that particular call)? Any help is good.