NULL device audio question

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Dear All & Benny,

        I am using simple_pjsua to do the call test. There is no sound device on my board. I set the sound device to null sound device.
But now I try to play a PCM file and make remote client can heard the PCM data.
My question is as below
1: Should I put the PCM file reader code in null_put_frame() (in null_port.c) and send PCM data to conference bridge? Is that a correct way?
2: How can I send PCM data to conference bridge and make put_frame() (in conference.c) can put the data to do the decode/encode

Thanks for your help!!!!!!!!!!!!!!!!!!Thanks!!!!!

Duncan
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