Change Categories in UCP Voicemailbox

Hello,
can someone tell me, how it`s possible to change the categories in UCP Voicemail?
There ist as standard listet:

  • family
  • friends
  • old
  • work
  • urgent

This is not functionally for me, so I`d like to change it.
Also for different Voicemals I need severals categories, is it possible too?