Sony Ericsson Hands Free

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gruni

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Joined 2008
Hello!
Does anybody know how new Sony Ericsson mobile phones (W902 in my case) make the hands free system recognize that there is a call coming in? Is there a signal in the FastPort-connector that can be used?
Older models like the k610i lifted the signal ground from 1.1V to 1.3V to power ground when there is audio output. is there anything simmilar in the newer models?

Hope, you can help me!
 
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