We do not recommend use of a medical alert device on VoIP phone lines.
An alarm system is designed to send its signals over an analog (standard) phone line. To transmit emergency signals properly using VOIP (broadband) the signal must be converted. It is during this conversion that problems develop. Signals can arrive at the medical alarm monitoring station with errors or not at all.
A medical alarm typically comes equipped with a back up power supply in the event of a power failure. Because traditional phone lines will still work even if your power is out, your medical alarm monitoring station can still receive the proper signals if you press your button for help. With VOIP, your phone service will not operate during a power failure, preventing any kind of signal transmission from your alarm to the medical alarm service provider.
VOIP services tend to be more prone to technical issues and dropped calls. Your medical alarm may be communicating vital data to your monitoring station and a dropped call will obviously interfere with this. Or, your alarm's signal may go through without a problem on one attempt, but will fail on another for no reason.