PLANET VIP-6040PT - Manual (Page 90)

Gigabit Color LCD HD PoE IP Phone (4-Line)
VIP-6040PT
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7.14 Call Mute
When you use the Mute feature, other parties will not hear your voice while you can
hear their voice. Call mute applies to all modes (handset, headset, and
speakerphone).
To mute the call during a call (including a conference call)
1. Press the mute key , then the mute key glows green, and the LCD displays
2. To disable the mute function, press again.