Detect call state while application is in background

how can detect the call state , for example : exit the app when call disconnected .
I tried this code but it wasn't workfor me .The code:
- (void)applicationDidEnterBackground:(UIApplication *)application
      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(exitDisconnected) name:CTCallStateDisconnected object:nil];
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
I googled so much , but I dont find anything.
thanks.

First thing .. your application will not be a J2EE application and EJBs will be definitely an overkill ....
Write a small stand alone java program ( I don't think it will be large) and do the needful.
Schedule your java process as a cron job (in UNIX) or as a sceduled task (In NT)
I need to create J2EE application that should every
day grab some information from the database, write it
in a file and send this file to the ftp server.
Could you recommend me better solution?
Is it possible no window exists while application is
running in order nobody could close window
accidentaly?
Thank you.
Qand

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