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Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?

I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy).
The problem is how do I connect the  microphone pins from the 3.5mm jack? That is how do I connect the two leads marked "?" (see the third picture for what I want to achieve.)

PS: I am not sure whether the microphone jack pinout is the same as drawn. Anybody can confirm whether this is right?

Picture of Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?
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