ZyXEL Communications V300-T1 User Manual page 126

Zyxel v300-t1: user guide
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Chapter 16 Troubleshooting
Use the VOLUME keys to increase or decrease the volume.
• When no audio device (the handset, speakerphone or an external headset) is active, the
VOLUME keys control the ringing volume.
• When an audio device is active, the VOLUME keys control the input and output of that
device.
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V300 User's Guide

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