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Help attaching an MIC to my sim300Z

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financecatalyst

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Hi
I am newbie and need some help from experts here. I have an sim300z module. I have got the power supply arranged for it. I need help in attaching an MIC to the MICIP & MICIN. I have read te datasheet but I dont know what is "difference circuit" and also if the RI pin goes low for longer (I assume when receiving a call) and I send ATA, will the caller be able to hear from the MIC attached to the SIM300z.
The above questions may sound too simple for few people here but I am going insane finding info from the web without any luck so PLEASE try to help if you can.
 

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