You can check the agent statistics here. To filter your choices, select the agent from the drop down menu and select the hangup cause from the other drop down.
The hangup causes listed are:
No User response : When the user was not able to provide a helpful response to the caller.
No Answer : When the agent did not answer the call.
User Busy : When the agent is busy on another call.
Normal Clearing : When the call is taken by the agent.