![May 2022 Update 2 – New category features and improved zooming in the scheduler](https://www.signl4.com/wp-content/uploads/2021/01/Preset1kleiner-1080x675.jpg)
![May 2022 Update 2 – New category features and improved zooming in the scheduler](https://www.signl4.com/wp-content/uploads/2021/01/Preset1kleiner-1080x675.jpg)
![Derdack SIGNL4 Joins Microsoft Intelligent Security Association (MISA)](https://www.signl4.com/wp-content/uploads/2022/05/MISA_Visual_new-1080x600.png)
Derdack SIGNL4 Joins Microsoft Intelligent Security Association (MISA)
MISA nomination paves the way for an effective anywhere 24/7 response to security incidents and demonstrates long-term commitment to the Microsoft relationship Richmond, May 1, 2022 Today, Derdack SIGNL4 (www.signl4.com), provider of critical alerting and...![Holiday Import from iCal Files](https://www.signl4.com/wp-content/uploads/2017/11/curtis-macnewton-317636.jpg)
Holiday Import from iCal Files
SIGNL4 offers powerful duty scheduling and time-based overrides for routing alerts to the right people at the right time. With time-based overrides for example, you can apply different alerting workflows during business hours, weekends, holidays, etc. Holidays in...![May 2022 Update – Templates, scheduler enhancements, landline numbers, and more](https://www.signl4.com/wp-content/uploads/2019/07/options-1080x600.jpg)