I’m trying GSM modem WMOD2B in voice call. I’m able to call the device but there’s not sound in the speaker and nothing sampled in the microphone. I’ve tried to set up speaker & microphone and search for appropriate AT command to enable it if so. I’ve tried to play melody with AT command AT+CRMP. it returns OK but can’t hear anything. I had found that the speaker must be 32 ohm & mic input is max 43mVrms input. So a 32 ohm is plug on the + and - signal from the DB15 and same for mic.
Doesn’t anyone can help?