some one plz help me in outgoing call the only thing left in my graduation project

i m able to receive call...
i want to play a wav file in outgoing call ....
plz help me in doing that here is some code which i m using for out going
call that code is dialing correctly ..but nothing else doing except
dialing...... would u plz add some code for playing audio file in it....




import javax.telephony.*;
import javax.telephony.events.*;
import javax.telephony.callcontrol.*;
import javax.telephony.callcontrol.events.*;
import javax.telephony.CallObserver;
import javax.telephony.media.*;
import  javax.telephony.media.events.*;


import java.net.*;


public class MyCallCtlOutCallObserver extends java.lang.Object implements
MediaCallObserver{

  MediaTerminalConnection mtc;
  public void stopSound(MediaTerminalConnection mtc) {

     try {
       mtc.stopPlaying();
     }
     catch (Exception myExcep) {
       //////System.out.println("Exception in stopSound
method:  "+myExcep.toString());
     }
   } /////

///////////////////////////////////////////////////////////////
   public void playSound(MediaTerminalConnection mtc, String sound) {
     try {
       mtc.usePlayURL(new URL("file:" + sound));
       mtc.startPlaying();

     }
     catch (Exception excp) {
       // Handle exceptions
       //////System.out.println("Exception in playSound: " +excp.toString
());
     }
   }

   public void callChangedEvent(CallEv[] evlist) {
     System.out.println("IN CALL CHANGE.....");



for (int i = 0; i < evlist.length; i++)
         {
             CallEv ev = evlist[i];

 if (ev instanceof ConnEv)
                 {
                   String name = null;
                   try {
                    Connection connection = ( (ConnEv) ev).getConnection();
                     Address addr = connection.getAddress();
                     name = addr.getName();
                   }
                   catch (Exception e) {
                     System.out.println("Exception is " + e);
                   }

                   String msg = "Connection to Address: " + name + " is ";

                   switch (ev.getID())

             {
             case ConnAlertingEv.ID:
           System.out.println(msg + "ALERTING");
       break;
   case ConnInProgressEv.ID:
 System.out.println(msg + "INPROGRESS");
        break;
    case ConnConnectedEv.ID:
  System.out.println(msg + "CONNECTED");
        break;
}
}//End IF
}
   }//end call change
}

plz reply soon...............

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