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6.3.6: if you have Digium Phones please read the article Updating to Switchvox 6.4.
6.4 or later: please read the article Updating to Switchvox 6.6.0.1.
Issues Resolved
Improvements for the stability of the Switchvox Softphone App.
Additional Phones now correctly inherit the Main's setting for its desktop Digium Phone to require a password to access the Voicemail app.