Telephony interface apparatus to suppress unwanted signals such as acoustic shrieks that may be harmful to the ear

摘要

A telephony interface apparatus adapted to interface between a telephony device and a headset, the apparatus including: control means for controlling functions of the apparatus; function selection means coupled to the control means for selecting one of the functions; a rotationally movable dial coupled to the control means for selecting a setting of a selected function by movement of the dial; and digital display means for displaying the setting.