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Need help getting audio in and out of SIM900

Posted: Thu Jan 10, 2019 4:52 pm
by stoil
I can call/receive call but have no sound. I found commands like AT+QAUDCH=1 to switch channels, AT+CHFA etc, etc but shield always returns ERROR;
Many commands work and many don't. Yesterday when I plugged the earphones for the first time, I could hear the tone when receiving a call with without any commands.
shield is SIMCOM SIM900 Shield with the pink and green audio inputs.
Regards :)