I am planning to use SPEAKER interface of wavecom gsm module with microcontroller ADC pin to record incomming call voice and MIC interface of wavecom gsm module with microcontroller DAC(digital to analog converter) pin to make a call and playback voice massages stored in microcontroller. Kindlay suggest the
1. Interfacing circuit between SPEAKER output of gsm module and adc pin of micro. 2. Interfacing circuit between MIC input of gsm module and DAC pin of micro.
thanks in advance