![]() You should now hear sound from your speakers and you can also speak into theĪfter you are done with your call, you can hangup with: AT+CHUP ![]() Go back to the first terminal and dial the number: ATDxxxxxxxxxx įrom the same dialogue terminal he route audio: AT^DDSETEX=2 ![]() The audio sampleformat, S16_LE is 'Signed 16 bit Little Endian', Rate 8000 Hz, Mono it depends on the response from AT^CVOICE? other modems may require S16_BE Open another terminal and enable microphone: Open another terminal and enable audio: sudo cat /dev/ttyUSB1 | aplay -f S16_LE The -c means local echo on, making AT commands visible as you typeįind the audio sample formats supported by your modem: AT^CVOICE?Ī reponse of 0,8000,16,10 means the rate is 8000hz Usually, the dialogue port (ie 1st port) is /dev/ttyUSB0, audio port (ie 2nd port) is /dev/ttyUSB1 and sms & internet aka data port (ie 3rd port) is /dev/ttyUSB3
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