The following Funktel DECT handsets have an emergency call button: FC11, FC4 Medical, FC4 L F, FC4 Ex, FC4 S and FC4 S Ex

To configure the number to be called when pressing the button, navigate to 

"Menu -> Setup -> Phone settings - > Emergency number -> Gap". You can enter the dedicated number here.

To quickly call this emergency number, press the button for a few seconds or press it once and confirm it with "ok".