1. https://www.amazon.com/gp/product/B003TM3DLE/ (the main module of The Visit System)
https://www.amazon.com/Bellman-and-Symfon-Phone-Sensor/dp/B00K57TWPC/ (the Cell Phone sensor for The Visit System.)
2. Just pair it with a Link2Cell cordless phone. I bought this one.
3. https://www.amazon.com/LightOn-Detector-Alert-Phones-White/dp/B007SVAEI2/ is not as techy but might do for some folk.
Is there any device on the market that can let you when someone is calling your cell phone, when its on silent and in another room of a large home.