Plantronics Calisto 240-M - Manual (Page 5)

Plantronics Calisto P240 USB Handset 5
2 Setup
2.1 Connecting USB Phone to PC
1 Connect the P240-M USB cable into any open USB port
on your computer. Windows will automatically detect a new
device and no additional drivers are necessary.
2 If you are also using another audio device with Microsoft Lync
make sure the P240-M is the default device in the Handset or
Headset section of the Audio Set Up Tool.
The P240-M has two function keys (3 & 5) just under the LCD.
These correspond to the text above them. When pressed they will
perform the task above them in the display at the time they were
pressed. Their function may change as a result of pressing them.