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Flashphoner.init(this);

SessionOptions sessionOptions = new SessionOptions(mWcsUrlView.getText().toString());
session = Flashphoner.createSession(sessionOptions);

Connection connection = new Connection();
connection.setAppKey("clickToCallApp");
/**
  * Connect to WCS server
  */
session.connect(connection);

@Override
public void onConnected(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mCallButton.setText(R.string.action_hangup);
            mCallButton.setTag(R.string.action_hangup);
            mCallButton.setEnabled(true);
            mCallStatus.setText("Connection: " + connection.getStatus());

            /**
              * Pass 'callee' to the callOptions and create a new call object
              */
            CallOptions callOptions = new CallOptions(mCalleeView.getText().toString());
            call = session.createCall(callOptions);
            call.on(new CallStatusEvent() {
                ...
            });

            ActivityCompat.requestPermissions(ClickToCallActivity.this,
                  new String[]{Manifest.permission.RECORD_AUDIO},
                  CALL_REQUEST_CODE);
            ...
        }
    });
}

case CALL_REQUEST_CODE: {
    if (grantResults.length == 0 ||
          grantResults[0] != PackageManager.PERMISSION_GRANTED) {
        mCallButton.setEnabled(false);
        session.disconnect();
        Log.i(TAG, "Permission has been denied by user");
    } else {
        /**
          * Make the outgoing call
          */
        call.call();
        Log.i(TAG, "Permission has been granted by user");
    }
}

mCallButton.setEnabled(false);
session.disconnect();

@Override
public void onDisconnection(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mCallButton.setText(R.string.action_call);
            mCallButton.setTag(R.string.action_call);
            mCallButton.setEnabled(true);
            mCallStatus.setText("Connection: " + connection.getStatus());
        }
    });
}