Check your headset/speaker volume
Your headset or speakers and the device they are connected to have a number of volume options. You can check the following:
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Ensure that the volume on your device, headset, or speakers is sufficient and not muted. You can check this by playing a video or some music on your device.
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Check that the headset or speakers are enabled on your device's sound settings.
If necessary, you can select a different headset or speaker to use during the call. For more information, see Change your device settings