Sirens only sounds for couple seconds

I’ve noticed on IQ Panel 4 that when an alarm is triggered the sirens, both the panel and zwave only sound for a couple seconds and then go silent without me disarming the system… Do you know why this might be happening and how can it be changed?

If you have 2Way voice enabled your siren will shut off so that a 2Way voice call can be heard during an alarm. You can disable 2Way Voice to change this.