hanshi:
i ve seen on youtube that i can put one end of the wire on the top of the jack and the other one in analog 0 of arduino and it will receive the audio
No, that's not how it works... at all.
You'll just end up destroying the Arduino.
Phone lines have a high DC voltage (48V).
Why do you need to have the Arduino? You have an analog phone signal, why do you need to digitize it first, to output it as PWM? It doesn't make sense at all.
The Arduino is a microcontroller, it was never intended for use in audio applications, it doesn't have a decent ADC for audio, and it does not have an analog output.