[. . . ] [. . . ] Please refer to your headset user guide for details of how to maximise the use of your headset. Plug the Bi-Way telephone connection lead into the telephone's modular headset port. Using the handset/headset switch will now allow you to interchange between using either the handset or the headset before, during or after a call. Plug your headset into the port showing a headset symbol on the rear of the Bi-Way switch. [. . . ] [. . . ]