Raw data transfer from custom audio device

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Hey guys,

I am struggling with sending raw, unmodified data from Alice to Bob using
custom audio device.
Goal:
1) Alice sends 'aaaaa' frame.buf from custom audio device to Bob using pjsip
2) Bob has the same custom device and should receive 'aaaaa' data on the
other end

Requirements:
1) Data must not be modified (no silent frames and etc)
2) Using standard stack
(custom_audio_device->port->conf_bridge->passthrough_codec->UDP_transport)
2) Getting data on the Bob's side should have the same configuration coming
down to custom_audio_device

Progress:
I was able to setup custom driver, add passthrough_codec  but data still
get's changed and it's not the same on Bob's end as Alice sends

Any advice would be very helpful form ides to working
solutions/configurations.

Best,
Alex
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