To switch out the default system recordings in Asterisk (I’m using Tribox), download the Voice Vector replacement files from http://www.voicevector.com/Downloads.php?PHPSESSID=ca76ce14c2a011256980418e7b1b7f05, extract them (e.g., with 7zip on Windows), connect to the server using WinSCP, rename the /var/lib/asterisk/sounds folder to sounds.old and upload the extracted sounds folder to the same place. Asterisk will pull the better recordings instead.

One especially nice feature is that the recorded attendant says “Asterisk Mail” instead of “Comedian Mail”.

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