Our server has been getting hammered and consequently locked by our host due to the iOS 6.0.0 bug which causes an audio stream to download over and over while the stream is playing. Is this the proper format to block specifically iOS 6.0?

ErrorDocument 503 /maintenance.html
RewriteEngine On
RewriteCond %{REQUEST_URI} !^/maintenance\.html$
RewriteCond %{HTTP_USER_AGENT} ^.*AppleCoreMedia.*OS\ 6_0\ .*$ [NC]
RewriteRule .* - [R=503,L]