def submit_sms_conversion(self, message_id, delivered=True, timestamp=None):
        """
        Notify Nexmo that an SMS was successfully received.

        :param message_id: The `message-id` str returned by the send_message call.
        :param delivered: A `bool` indicating that the message was or was not successfully delivered.
        :param timestamp: A `datetime` object containing the time the SMS arrived.
        :return: The parsed response from the server. On success, the bytestring b'OK'
        """
        params = {
            "message-id": message_id,
            "delivered": delivered,
            "timestamp": timestamp or datetime.now(pytz.utc),
        }
        # Ensure timestamp is a string:
        _format_date_param(params, "timestamp")
        return self.post(self.api_host, "/conversions/sms", params)
Notify Nexmo that an SMS was successfully received.

        :param message_id: The `message-id` str returned by the send_message call.
        :param delivered: A `bool` indicating that the message was or was not successfully delivered.
        :param timestamp: A `datetime` object containing the time the SMS arrived.
        :return: The parsed response from the server. On success, the bytestring b'OK'