What is a telephone headsets amplifier/adapter and why might I need one?

If your telephone does not have a headset port, you will need an amplifier/adapter to control the volume on your headset. Amplifiers give you volume control for both incoming and outgoing voice levels.

An amplifier/adapter is needed when connecting a headset to a telephone when there is no dedicated headset port on the telephone. You can determine if your telephone requires an amplifier/adapter by checking the sides and bottom of your telephone for a dedicated headset port. The port will usually be marked with a headset label. If your particular telephone does not have a dedicated headset port, you can connect your headset via an adapter/amplifier.