Hi, I have connected ITEAD RPI GSM Add-On V2.0 with Raspberry Pi. Using AT Command, I am able to originate a voice call.
But the problem i am facing, i can't receive/send voice raw data from serial port. Voice input MIC & and output Speaker(SPK) is working fine when i plug mic and headphone. So, what to do if i want to get received gsm voice data on serail port? And send gsm voice data from serial port as well.