In the case of its IP Camera, you can check the Video/Audio output at the same time by entering the following RTSP command into the VNC player.
E.g.) rtsp://{ip address}:554/onvif/media?profile=Profile1

– If you want to test audio only, you can use the following RTSP command (H.265 Camera Only)
E.g.) rtsp://{ip address}:554/trackID=90
– If the audio is not heard in VNC, etc., check the Audio Track or Output device information setting in the Audio menu.