T54W shows voicemails when there are none.

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Hi,

Any (voicemail) notifications are usually sent by a PBX or VoIP provider to the phone.
If there is no VM and the phone say there is, then or reset the PBX or contact your VoIP provider, or try first reset the phone to factory default.

Hope this will help.
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Hi, we are using a Yeastar S300 PBX, I can not find where the voicemail is stored or tied to the extension.