Using a headset with your phone (VVX 3xx/4xx series)
You can use a variety of headsets with your phone. When your headset is plugged in to the headset jack, you can make or receive calls by pressing the headset button, instead of lifting the handset.
Note: Every headset is unique. For accurate installation instructions, refer to the headset owner's manual. After the headset is installed, you may need to adjust settings on the headset (found in the manual).
To plug in your headset:
Turn your phone over and look for the headset jack, located to the far right; it will be labeled with a headset icon.
Plug the cable from the headset base into the headset jack.