See how to retrieve your VoIP voicemail.
To listen to your messages from another phone:
Voicemail can store up to 30 minutes' worth of messages. When the mailbox is full, an automated recording will prompt you to delete messages. While the mailbox is full, you will be unable to receive new messages. Callers who attempt to leave you voicemail will be informed that you are currently unable to receive new voicemail messages.
To skip the Cisco Unity voicemail greeting when leaving a message on another’s VoIP phone, press #.