SDA / Qtek 8020 / I-Mate SP3i / HTC Feelers 2,5mm headset

[coolhand]

Hello,

For my sda 2 witch has a 2,5 mm 4 pins headset connector i am looking for the pinout so i can modify my existing car kit.

Hopefully anybody can help me.

I don.t  think the connector behind following link is the correct one http://pinouts.ru/connector/4_pin_3.5mm_2.5mm_JACK_connector.shtml

as i believe that all four pins are used. gnd, left, right and mic, only the follow up is unknown to me.

Thanks in advance.

[jimmybar]

Does anyone know about the pinout of the connection to I-mate ..i want to make a long cable for it between USB and my i-mate