Legacy VoIP Mode and Apple Push Notification Service Updates in iOS 13

In iOS 13, Apple has made updates to the way applications in background mode are notified of incoming calls and messages, in order to preserve battery life. This change will impact users of Cisco Jabber and Webex Teams. To make sure that your system supports the Apple Push Notification service (APNs), you must upgrade your system to a supported release by the prescribed dates and enable APNs.