Voicemail Envelope information
Add an option to press a button (ex: 7) in the mailbox that plays the date/time/callerID and CallerID name of the voicemail in the mailbox. Otherwise there is no way to know by listening to a voicemail what the caller ID is. Also, there is no way to log into the web interface of a voicemail to check unless it is a call queue or your own mailbox. So, when sharing mailboxes this is a big obstacle.
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Peter commented
Also on at least Polycom VVX 500 some carriers support showing a number overlayed over the voicemail / envelope icon on screen in addition to the WMI (message waiting indicator).