Detecting AnseringMachine on Composer

Hello, I need to develop a voice application in composer which detects if the callstate is AnsweringMachine or not, I could not find any UserData that indicates this and I could not find a way to read the callstate on any variable.

Does anybody know how to identify whether the call was received by an AnsweringMachine?

Thanks

You have to send a beep configuration in campaign level , so u can receive it using externalmessage.cpa.beep in the global exceptional handling in entry block. Hope this helps