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how are you publishing the track? using which SDK?

we do not specify a fixed channel, that's up to the encoder / webrtc client

Hi David. Thanks for your reply.
I have thought that the webrtc track's sampleRate &amp; channels are determined by the `sdp` which is :slightly_smiling_face:
```a=mid:audio
a=rtpmap:111 opus/48000/2```

So trackInfo with stereo false is confusing

is this published via Ingress?

Are you posting the offer or answer here? Stereo in webrtc is pretty complicated, we should be handling it correctly if the right attributes have been set during publishing. For more context see <https://github.com/w3c/webrtc-extensions/issues/63|this issue here>.