AbstractPhoneListener not responding second time:

Question

-->I use custom screen on call initiated , connected, disconnected with blackberry5.0. First time when invike call , application can get respond of every event like call initiated , call connected, call disconnected and shows respected custom screens. -->After call disconnected , it shows the custom call history of my application.

-->Now from my application when user click back button, it shows device call logs. -->Now on back it will return control to my application from where user can initiate call. -->But this time, When user invoke call from application ,phone listener is added but it shows device call screens not mine custom call screens.Phone listener not responding this time.