/etc/yate/dsoundchan.conf is in yate-core 5.4.0-1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; Settings for the DirectSound audio channel
; primary: boolean: Use the primary playback sound buffer instead of a secondary
;primary=yes
; rate: int: Default sampling rate used, can be 8000, 16000, 32000
;rate=8000
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