MixMonitor to create two channel stereo in one audio file

My asterisk version is 20.1.0.
I would like to create two channel stereo in one recording file.

 same => n,MixMonitor(${testFile}.wav,D)
 same => n,Stasis(externalMedia,UserId=123)
 same => n,StopMixMonitor()

However, only one channel shown in the audio file.

How can I configure create two channel stereo in one recording file?

Howdy! Welcome to the forums.

The commit for the ‘D’ option in the MixMonitor() application was added on 2024-11-04T00:00:00Z:

Which means it was not available in a release until Asterisk 20.11.0 was released on 2024-11-21T00:00:00Z:

Are you able to update your Asterisk version and try again ?

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