yes it is possible.
you need root access to add a script and change ownership to asterisk.
edit voicemail.conf to point externnotify to the downloaded script
edit extensions_custom.conf to create the hint for the extension
program a dss key as TYPE BLF Value *98extension
the programed key will be green = no messages red = messages
press the button to call vm and login with the extensions password
I have tested this on the Yealink T48G after updating the UCx. The display of the T48G shows the BLF indicator as "Talking" if programmed as suggested by emtsupport. I suggest programming the label of the button as "*98xxx" so the user will knwo when they see the "Talking" indicator, there is a voice mail message in the mailbox.
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