Twilio Send reply not hitting provided URL

I have configured Twilio phone number and given settings as per the documentation. On the callback URL i have written code like this

Route::post('/replyMessages', function(){
    Log::info('inside reply messages URL');
    $response = new \Twilio\TwiML\MessagingResponse();
    Log::info(print_r($response, true));
    $message = $response->message("Testing sms from twilio to staffing backbone");
    print_r($response);
    Log::info('SMS reply URL callback');

});

When user is replied from their mobile nothing is happening. If URL hits log will print but not working. Kindly help me on this.

via Chebli Mohamed