My parents are 90 and in poor health. They receive calls from this number constantly, yesterday they called 5 times, complete silence when my parents answer. I have tried to tell my parents not to answer calls when they don't recognize the number but thats not working. I've answered before and it's either silence or smoke alarm survey, have told them nicely and not so nicely not to call again but they continue. Always foreigners, sounds like from India. Unfortunately my parents phone provider, Comcast, will only allow 3 numbers to be blocked and I think they changed that so no numbers can be blocked now. I have registered them on do not call website but the number of calls they receive of this type daily/monthly you'd never know it.