By default, the voicemail is enabled for all extension users. You can disable the Voicemail function if the user doesn't need it.
Use call answering rules to determine what happens when a caller reaches your voice mail. For example, if you have automatic replies turned on, then you could set up your rule to transfer the caller to a different number. If you have multiple rules, you can specify the order in which they are applied.

Rehearse or write down your message before recording it. Remember that old saying “practice makes perfect?” It’s certainly true when it comes to creating an electronic greeting. The more you’ve rehearsed, the easier the message will be to restate. If you don’t have time to practice, writing down the greeting before recording it – and then reading it aloud from the paper – may help you stay focused on the correct wording.
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