I have several users at one of my sites where they aren’t able to listen to voicemails or record a greeting (the voicemail button basically does nothing) if their inbox is empty. If I call and leave a voicemail then the voicemail button works just fine.
Aastra 57i or 6737i
Things I’ve tried:
Completely deleted the extension from Endpoint Manager, Extensions, and User Manager and rebuilt from scratch.
Deleted the config file off the server and rebuilt
Deleted the voicemail box from the server and rebuilt
Completely wiped the phone (config file and factory defaults) then reprovisioned
Replaced the phone with a completely different one