Dell C2723H 27" Video Conferencing Monitor - Manual (Page 91)

Operating the Monitor
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Click DELL C2423H / C2723H , and then click Set Default , the monitor speaker will
be used as the default setting.
Click OK to exit the Sound setting.
If the USB cable and the HDMI or DP cable are connected from the monitor to the
computer, two audio paths named
DELL C2423H / C2723H and Echo Cancelling
Speakerphone (C2423H / C2723H) from the monitor will show in the Sound
setting interface. The DELL C2423H / C2723H monitor would show options for
two audio paths supported in the monitor.