Software upgrade with Calls feature for NXS-97XX-4G/5G and MHD-8100 line of devices. The upgrade enables wake-up calls, text-to-speech, and audio file calls *. The Calls feature allows making wake-up calls (ring only), text-to-speech calls and audio file calls to a single phone number or group of recipients. This feature is ideal for delivering urgent messages or announcements, such as alerts, emergency notifications, or other time-sensitive information.