Probably like us you have had a power cut or two over the past couple of weeks - what fun. This set me wondering because in 3 weeks we will go over to a full fibre connection to Millstone manor and our land line will switch to Voice over Internet protocol (VOIP). With the traditional land line the power for the phone - ringing and speech is derived from the exchange so they stay working in a power cut. What happens to your VOIP phone in a power cut at you home I wonder, I assume it stops operating, and then what happens to your monitored alarm if the power fails because it can no longer warn you if you are out or inform the monitoring company if an alarm is triggered. Just solved the alarm problem by getting our alarm company to switch us to radio monitoring, but what about home security and emergency calls. Do I need a Uninterruptible Power Supply (UPS) I wonder and if so how big.