public function create($phoneNumber, $options = array()) {
        $options = new Values($options);

        $data = Values::of(array(
            'PhoneNumber' => $phoneNumber,
            'FriendlyName' => $options['friendlyName'],
            'CallDelay' => $options['callDelay'],
            'Extension' => $options['extension'],
            'StatusCallback' => $options['statusCallback'],
            'StatusCallbackMethod' => $options['statusCallbackMethod'],
        ));

        $payload = $this->version->create(
            'POST',
            $this->uri,
            array(),
            $data
        );

        return new ValidationRequestInstance($this->version, $payload, $this->solution['accountSid']);
    }