which type of microphone and speaker we need to connect to gsm sheild if we want to hear the voice of other caller and speak to other people and he is able to listen our voice.please provide the complete specification for that.
See M10 manual, page 49 and following: http://arduino.cc/en/uploads/Main/Quectel_M10_datasheet.pdf
what component is ESD ANT 1, i don't know plz help.
It may be a suppressor diode.