AT#DTMF and AT#SPCM during voice call in progress

4 thoughts on “AT#DTMF and AT#SPCM during voice call in progress

  1. 1. After opening line I am sending AT#DTMF=1 to enable DTMF decoder. After receiving DTMF-tone that is expected, I am trying to disable DTMF decodet with AT#DTMF=0, but exception raised and Python scrip stps.

     

    2. After opening line I am sending AT#SPCM=1,1 to send PCM soud on audio channel and also exception raised. In command mode SPCM is working even when the line is closed.

     

    Module is GL865-DUAL, firmware 10.00.155.

      1. Sorry, it was my fault. Using readlines instead of readline when reading sound file for SPCM.

         

        Btw,  can I use DTR line instead of ‘+++’  to exit PCM sending faster?

        1. Yes it is possible to close SPCM with a transition on DTR after having set AT&D1
          Please be aware of the fact that exit from DATA mode is signaled by DCD. No message like NO CARRIER is sent trough UART.