Need help while using the android.telephony package

Question

I am using the following code to make a call from an Android application

public class CallActivity extends Activity {

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    call();
}

private void call() {
    try {
        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setData(Uri.parse("tel:18004253101"));

        startActivity(callIntent);
    } catch (ActivityNotFoundException activityException) {
        Log.e("dialing-example", "Call failed", activityException);
    }
}

}

I have the following requirement.

i>I am calling a number . ii>When the number is connected , I need to pause the call for few seconds. iii>After pausing for few seconds, I need to call the extension number automatically.

Right now , I am able to call the number , but doing R&D on how to pause the call for few seconds when the call is connected & then automatically call the extension.

Kindly help if anyone has already implented something similar.

Warm Regards,

CB