recorded(wav) file during a voice call?

I want to develop an application through which if the caller calls you, the call should be answered automatically without user's involvement and the caller could hear a pre-recorded voice which is already recorded and saved.The audio file should be in .wav format.I searched for help in google but i came to know that it is not possible in Android but there are some android applications which have the same functionality.So i think there is some possibility for this.Excuse me if the question is wrong.I would be grateful if some one help me.I am using eclipse Helios with ADT Plugin. I've tried the below code but it didn't work out.If someone know the answer please help me out. I've used broadcast receiver to read the phone state changes.In CALL_STATE_OFFHOOK, i wrote the following code.

case TelephonyManager.CALL_STATE_OFFHOOK:
Toast.makeText(context, "Call Picked..", Toast.LENGTH_LONG) .show();
Log.d("received", "Call Picked....");
final MediaPlayer mPlayer = MediaPlayer.create(context, R.raw.music_file);
                    mPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);
                    mPlayer.prepareAsync();
                    mPlayer.start();
                    mPlayer.setOnErrorListener(new OnErrorListener() {

                        @Override
                        public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method 
mPlayer.reset();
                            return true;
                        }
                    });
                    AudioManager am=(AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
                    am.setMode(AudioManager.MODE_IN_CALL);
                    am.setSpeakerphoneOn(false);
                    am.setMicrophoneMute(true);
                    Log.d("in call","sent audio");
                    mPlayer.reset();
                    mPlayer.release();
                    break; 

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将音频配音成电话完全不受Android硬件支持。

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"Auto Call Answer" by DevIndia Infoway is on the playstore. It works by playing back an mp3 while switching the handsfree on. So the other party will hear what is played (and also if there is other noise in the room). Not really rocket-science.

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