Plantronics Calisto 540 - Manual (Page 8)

Plantronics P540-M User Guide 8
For more information about how to use the headset or speaker,
see “Switching between audio devices in your phone” later in this
document.
Microphone Mute
Mutes the microphone based on the selected audio mode.
Microphone Mute is the lower-right button on the keypad.
Volume
Changes the volume. Push “+” or “–” to adjust the volume of your
handset, headset, or speakerphone.
Playback speaker volume is the last button on the keypad.
Hook Button
Indicates whether you are using the handset. The Up position
selects the handset. The Down position deselects the handset. A
quick press of the Hook button (less than a half second) performs
the function of the Flash button.
The Hook button is located on the upper-left side of the phone, where the
handset sits.
Hands-Free Microphone
Located on the lower-right corner of the phone. Do not obstruct
the area in front of the microphone.
The microphone is located on the lower-right corner of the phone.