[asterisk-users] changing inbuilt sound messages

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Hi all,

I am wanting to change the sound files from the standard ones to a New 
Zealand voice pack.
I have copied the files into the /var/lib/asterisk/sounds directory and 
chowned them to asterisk:asterisk and chmod 420 to match the existing 
files but the system is still using the original files.
The original files seem to be wav files while the NZ voice pack ones are 
gsm files.

How do I get the system to use the new gsm files?

Thanks
Kate