On the Voicemail page you can configure your voice mailbox.
Note, that this page is only active if your provider has enabled the Unified Messaging services for you. Depending on your needs, you may activate / deactivate Voicemail by selecting or clearing the check box on the top.
To check your mailbox, click the Voicemail Inbox button.
You will also find these tabs under Voicemail:
Mailbox Display Options
Message Display Options