Use this method to send audio files, if you want Telegram clients to display the file as a playable voice message.
        :param chat_id:Unique identifier for the message recipient.
        :param voice:
        :param duration:Duration of sent audio in seconds
        :param reply_to_message_id:
        :param reply_markup:
        :param parse_mode
        :return: Message

def send_voice(self, chat_id, voice, caption=None, duration=None, reply_to_message_id=None, reply_markup=None,
                   parse_mode=None, disable_notification=None, timeout=None):
        """
        Use this method to send audio files, if you want Telegram clients to display the file as a playable voice message.
        :param chat_id:Unique identifier for the message recipient.
        :param voice:
        :param duration:Duration of sent audio in seconds
        :param reply_to_message_id:
        :param reply_markup:
        :param parse_mode
        :return: Message
        """
        return types.Message.de_json(
            apihelper.send_voice(self.token, chat_id, voice, caption, duration, reply_to_message_id, reply_markup,
                                 parse_mode, disable_notification, timeout))