The FireServiceRota Alerting app is a lightweight stand-alone app for fast and reliable alerting for firefighters and first responders. The app allows you to reliably receive alerts and confirm/reject your attendance status.

The key features:

Alerts to your mobile device without restrictions (breaking through silent locks and Do Not Disturb modes).
Acknowledge or reject an incident callout
Monitor the response status of the rest of the crew
Customize the sound profile of alerts