S-COM’s 6K, 7K, and 7330 support a feature known as Long Tone Zero, or LiTZ. If you’re not familiar with it, read on!
LiTZ is a system for requesting aid during an emergency. It’s simple: Transmit a DTMF “0” character for at least 3 seconds and then announce your emergency. Nearly all modern mobiles and handhelds have DTMF keypads, so no additional hardware is needed by the user.