Headsets, Headphones, Handsfree - mobile phones and other equipment  > SonyEricsson pinouts
Wiring for the 2.5mm 4-pole headset socket as on the SonyEricsson P800/P900/P910i cell phones.
Pin Pin
1 Tip Speaker 1 +
2 Ring 1 Speaker 2 +
3 Ring 2 Microphone + / Answer Button +
4 Sleeve Ground

The Answer button is connected to pin 3 and to the Ground.

4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
According to 7 reports in our database (7 positive and 0 negative) this pinout should be correct.

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Sony Ericsson P800/P900/P910i headset / handsfree connector visual pinout:
Sony Ericsson P800/P900/P910i headset / handsfree connector diagram
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