my goal is to start a voice call and, when connected, play a predefined sound file and redirect incoming audio, if any.
I’m using a MC8775V connected via USB.
I can establish the connection sending “ATD123;” command, the phone on the other side rings, the card correctly detects when the call gets answered, but after that nothing happens.
Is there a way to send audio data to the card via USB? Is it possible to receive incoming voice stream?