[asterisk-users] language problem

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Hi all,

I have added a language pack nz under the sounds folder
I have changed zaptel.conf to be loadzone=nz defaultzone=nz
I have also changed the language in freepbx to New Zealand however when 
I go to my voicemail on my phone the CLI gives me
 <SIP/604-094eaac0> Playing 'vm-password' (language 'en')

when I think it should say language 'nz'

Where is the setting to allow me to get the system using the files from 
inside the nz folder?

Many thanks
Kate