Voice Mail Access
The "Voicemail" icon shows a red badge indication with the number of voice or extension messages that have been left for each different one. Clicking on the icon displays a list of the messages and selecting the individual one will either dial into the correct mailbox or call the extension that left the message.
In this example there are 3 messages.
Sales (1077): is a voicemail for an un-associated mailbox with the notification extension
1809: is an extension message left from extension 1809.
Local Mailbox (1021): is a voicemail for an associated mailbox for this extension.
When there are no outstanding messages then there will be no red badge indication shown