Voicemail is a service that lets callers leave a voice message for you if you are not available to answer your mobile phone. Voicemails are very useful for various circumstance, so you may need to save them to your computer.
Learn how to installer and run iBackup Viewer
Open iPhone backup with iBackup Viewer, and click the "Voicemail" button to load voicemails from the iPhone backup.
The voicemail list shows three columns:
Double click on a voicemail to listen.
There four options to export voicemails: