Nokia 6310 with ESP32 - call signal amplification

Hello
I don't know if this is the right forum, so if not here, please move it.

Can any of my colleagues give me some hints or direct me to some pages related to the cooperation of the phone with ESP32. What I am mainly concerned about:
I need to amplify and even "light up" the ringing signal.
My mum has a significant hearing loss but I can still communicate with her on the phone (mobile phone).
Unfortunately the problem is to hear the ringing. As long as the mobile phone is on the table in the room where my mother is, there is no problem. However, the problem arises when the mobile phone is in another room or in the jacket.

I would like to "somehow" connect/transmit the ringing from the phone to the ESP32 and once I have a signal/signal in the ESP I can handle both the light and sound signal.

And maybe someone has some other idea (the phone is a nokia 6310 - president's)

As far as I remember the N6310 has Bluetooth, as long as it is within range it can be paired with the ESP32.

I know that they can be paired.
What I am concerned with is how to transfer/get the ringing signal in the ESP32.
How is the ESP32 supposed to "suck in" the ringing information?
In other words, how is a relay connected to one of the ESP32 leads supposed to turn on after someone calls the mobile phone?

Exactly in the same way that a car's handsfree kit does via BT