website for USB pinouts for K310i !

Oh man... I was looking for this information for so long.... the USB connector details for my Sony Ericsson K310i mobile phone. While from the 2 pins from the charger, i was able to make out which pins were used for charging. I even made a charger which charges with any Input voltage (up to 37V DC!) & provides 5V regulated to the phone @ 500 mA with proper heat sinking.
But I always wondered how the phone detects that the earphones are connected to it. In normal audio appliances (radio, TVs, laptops...) the design of the connector (audio Output jack) is such that it disconnects the audio input to the inbuilt amplifier inside the device & routes it towards the earphones. Basically that's a mechanical arrangement.

Now looking at this information that I had found, it looks like the male connector shorts some pins on the phone side (8 & 9):


Some days ago, I bought an adapter that enables the conventional jack to be connected to Sony Ericsson phones:



But couldn't open it to find the pinouts. Anyways, it's good to know things, be it from webpage or practically :)