Lower the listening volume dial and speaking volume dial on the base. For most telephones, the correct setting is position 3.
If the audio level is too low in this position, adjust the headset volume control to increase the headset speaker volume.
If your speaking volume is too low for your listener in this position, adjust the position of the headset to make sure the microphone is as close as possible to your mouth.
Adjust the configuration switch. The most commonly used position is "A", which is the default position.