Log into your mailbox from your own extension: Dial *17.
Turn voicemail on or off: Dial *18 (on) or *19 (off).
When off, this stops the system from forwarding callers to your mailbox when you are busy or do not answer. It does not stop messages from being forwarded to your mailbox by other mailbox users.
Turn voicemail ringback on or off: Dial *48 (on) or*49 (off).
When this option is on, ringback occurs whenever you end a call and replace the telephone handset (unless another call is waiting). The system rings your telephone and when you answer, prompts you to log into your mailbox.