To be compatible with usual 3.5mm headPHONES jacks (3ring connector), our connector pinout assignment has to be: from tip to base: left earpiece right earpiece microphone GND
Usual 3-ring jacks as found on headphones just miss the 3d ring from top, thus leaving out mic with this pinout. Verified against Motorola phone, Standard headphone and 3.5mm headset by /jOERG
