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Editorial Team
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Asked: 2026-06-02T11:31:33+00:00

I’m working on a patch for chan_dongle for Huawei e177 modems which has one

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I’m working on a patch for chan_dongle for Huawei e177 modems which has one way audio problem.

For debugging purpose I decided to write an external test case to read and write audio from and to the modem but I was unable the receive the audio stream in any of the serial files after the modem was mounted. I use minicom to issue the commands, I pick up an incoming call using the relevant AT command but no bytes stream arrives to any file. The only output I receive is from the AT command in /dev/ttyUSB0.

I am trying to capture audio with:

cat /dev/ttyUSB1

I also tried modifying the terminal settings and then read

 stty -F /dev/ttyUSB1 115200 cs8 -cstopb -parenb -cooked min 1 time 0

Is there any extra step I’m missing here?

Thanks.

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1 Answer

  1. Editorial Team

    When an incoming call is answered with ATA, the modem needs to know where the audio stream should be sent, AT^DDSETEX= does this for us.

    I was missing that part. Here I explain the background and the solution for my question.

    Thanks for the clues.

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