What is the pin-out of the 4-pin audio connector

My brand new T440p has a single audio connector for both headset + microphone, similar to recent iphones and android phones. But although all use a 4-rings 3.5mm jack plug it seems that the signaling differs. So my question is:
Version1:
Tip: left audio
Ring1: right audio
Ring2: microphone
Sleeve: ground
Version2:
Tip: left audio
Ring1: right audio
Ring2: ground
Sleeve: microphone
Which of the above version is the Lenovo T440p using? This determines what kind of headset or y-adapter you can use with the laptop.
Thanks,
Simon

Hi,
You'll find the pin out of the 6220 in the M Series Help (User Manual). Just download the ZIP File from this webpage (http://digital.ni.com/manuals.nsf/webAdvsearch/DD0F3F9A89B8A84886256EE6006D520D?OpenDocument&vid=niwc&node=132100_US) and open the M Series Help.
Hope this helps.
Luca
Regards,
Luca

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What is the pin-out of the 4-pin audio connector

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