While wearing your headset, press the call button on the headset.
If you do not hear a dial tone, adjust the configuration switch (A-G) until you do.
Dial a test call from the desk phone. If needed, fine tune the volume with the headset volume controls. You can also adjust the desk phone speaking and listening volumes on the bottom of the base.
Note If your phone has a built-in headset port, you should only use it if you will not be using the HL10 lifter. In this configuration, you must press both the headset button on your phone and the call control button on the headset to answer or end calls.