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C300 Quick Start Guide
Reject an incoming call
Press
for at least two seconds.
Record a call
Press
briefly to start recording. Press again briefly to end recording. The function is available
only when a USB drive, formatted to exFAT or FAT32, is connected to the USB port type A. When
battery level is low, recording function is disabled. Recorded files cannot be played back on the
C300; unplug the USB drive from the C300 and plug it into the USB port of a PC.
For more information, see
Volume
• Press
briefly to increase listening volume by one step.
• Long-press
to increase listening volume continuously.
• Press
briefly to decrease listening volume by one step.
• Long-press
to decrease listening volume continuously.
The respective circle LEDs turn blue for two seconds to indicate the volume level. The more LEDs
turn blue, the higher the volume level.
The C300 will synchronize playback volume with a USB-connected Windows PC, or a Bluetooth-
connected iPhone or Android phone.
The C300 will synchronize phone call audio volume with a Bluetooth-connected iPhone or Android
phone.
Mute
• Press
to mute all six microphones. The circle LEDs turn red.
• Press
again to unmute the microphones.
• Press
while the speakerphone is ringing to temporarily mute the ringing tone.
Connecting a headset
To ensure privacy during a phone call, you can connect a headset to the 3.5mm jack of the C300.
The audio will be played through the headset.
Charging
Charging the battery of the C300
1. Plug the USB cable into the USB type-C port on the speakerphone.
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https://service.snom.com/display/wiki/C300+USB+Recording
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