Natural if your headphones are in your ears all the time.
But i use headphones just on work, cant hold phone all day, and when someon calls or sends sms to me, i dont hear nothing.
There is vibration, but that is not enough.
Stock rom is ringing with phones connecte !!!
AMD Phenom II X4 955BE ,Gigabyte MA790X,2 X 2GB Kingston HX1066
HD6850 LC Power 750W,TT Armor +MX