I thought to myself, “No, I’ve used Filezilla to download http:// links before.”
Then I thought, “If only there was documentation available.”
I looked and you are right. When I was last following FileZilla Client in 2008, there was a request to add http URL processing to FileZilla, I was under the mistaken impression that it had, in fact, been added. I just checked the FAQ for FileZilla and found that, in fact, No - this feature had not been added to the system.
My mistake - sorry.
If you are still planning on using FileZilla for the download, you can enable this by modifying the /etc/vsftpd.conf file and setting it up either “per user” or as a default server. Make your root directory (either for the server or per user) to /var/spool/asterisk/monitor/ and set up the rest of the authentication and security features to taste.