If all you want to do is delete all the voicemails for a specific extension, you can simply navigate to the voicemail folder on the 3CX server, select the desired extension folder, and delete the files.
Alternatively, you may want to take a look at our
3CX Voicemail Manager tool. With our tool, if you are a manager of the extension, you can select which voicemails to delete, or delete all of the voicemails for a specific extension. We also have a retention policy that can delete voicemails older than the specified number of days automatically. The tool also provides enhanced group voicemail boxes, voicemail escalation, the ability to add an introduction to a voicemail before forwarding to another extension, archiving, and more...