Did you even try testing it? It won't "answer" the call unless they press the check mark or softkey. All it will do is display the second call and it will be up to the user to accept/reject the call based on the caller ID.
tek-hut, try having the user press the right most softkey underneath the screen when the second call is being presented. This should change to the other call coming in and display the caller name / caller ID information.