How to answer my land phone from my Android smartphone using Bluetooth or Ethernet?
For academic purposes, I want to develop a solution so that I can answer my land phone directly from my smartphone when I'm at home close to the land phone, so, no Internet or other kind of long-distance communication here.
Imagine a scenario where I'm at home, the land phone rings and I have the call information on my smarphone and I'm able to answer or reject it directly from my smartphone.
I know the phone carriers offer services called "Follow me" that will redirect the call to my cell phone if it rings a few times and no one answers it, but, that's not what I mean. I want to answer the call on my smartphone as if it were an extension of the land phone.
Two ideas came up to my mind, but I'm not sure I could make any of them work.
1- I thought of using some microcontroller like Arduino or something to hack the phone and somehow work as a bridge between the land phone and my smartphone via an Android application using bluetooth or a Wi-Fi ethernet connection.
2- I also thought of using a cordless phone base and capture the RF signals with my Arduino and make it route the call to my smartphone, so that it would ring when the land phone receives a call.
If you guys think none of my thoughts would be viable, I would accept any kind of suggestions, even the most weird ones involving interconnection between multiple and heterogeneous devices, hardwares, softwares, technologies, etc.
Thanks in advance!