Zyxel V301-T1 Инструкция по эксплуатации онлайн [163/240] 12346

Zyxel V301-T1 Инструкция по эксплуатации онлайн [163/240] 12346
Chapter 16 Troubleshooting
V300 Series User’s Guide
163
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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