Notes about audio from Video Intercom System
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When you begin talking on a Video Intercom System call, the Video Intercom System audio plays through your smartphone’s audio output (receiver or speaker) according to the [Speaker mode] setting. This setting is available in the settings menu (Settings menu (overview)).
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While talking on a Video Intercom System call, you can temporarily switch between the receiver and speaker by opening the options menu and selecting [Speaker] (Changing the audio output).
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When Video Intercom System audio is played through your smartphone’s speaker, the Video Intercom System audio may cut out if there is background noise on your end. In this case, refer to the information above and switch to another audio output, or move to a quieter location.
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Certain smartphones do not feature a receiver or a speaker. In this case, the [Speaker mode] setting is ignored.
Changing the audio output
While talking on a Video Intercom System call, you can switch between the available audio outputs.
1.
From the [Video Intercom System] app’s operation screen, tap 
→ [Speaker].
→ [Speaker].2.
Select the desired setting.
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Available settings vary by your smartphone’s settings, hardware configuration, etc.
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This setting is used only for the current Video Intercom System call. The next time you answer a Video Intercom System call, the audio output selected for the [Speaker mode] setting will be used. You can change this setting in the setting menu (Settings menu (overview)).