Remote control from DECT phone

Projects General Guidance
1

Hello!

I have a Panasonic KX-TG7200FX cordless DECT phone. I'm trying to turn it into wireless connection. The charger has standart modular telephone jack, but only 2 pins are actually connected. I'm assuming that they are TX and RX. This is my idea: I will try to connect these pins to arduino's analog pins and start measuring the outputs. While measuring, I will make a call with the phone, apply some voltage to phone's microphone pins and hopefully I will find some interesting measurments on charger. And this is where my problem comes in. I googled, that phone lines have up to 48 voltage. How do I lower voltage, so it can be read on arduino? Can I make a voltage divider or do I have to buy an attenuator?

Thanks =)

2

By wireless conecction I mean some kind of digital connection, mabye serial. I don't want to transmitt audio from microfone. I thought I could connect mic pins together with or without resistor since mic acts as resistor.

About voltage, I found about 48V and, that voltage increases when phone's ringing but charger won't be connected to phone line so there is no way that phone rings.

I would need to buy oscillator to safely identify the charger pins right?

Thanks for reply.