Electronic hook switch cable for remote desk call control. Adapter type: EHS adapter. USB-A - RJ-11. Base color: Black. Used for answering and ending calls. With the APU72EHS from Plantronics, you no longer need an HL10 handset lifter, as it functions as a hook switch for call control to answer and end phone calls. The cable is suitable for use with devices from Cisco, Avaya/Nortel, and Samsung. Mobile and flexible thanks to the EHS connection. Connect the headset using the Electronic Hook Switch (EHS) to a phone: This allows you to handle calls solely with the headset without having to stay near the phone. Calls will also be signaled directly on the headset. If you are near your phone, you can transfer the ongoing conversation to the regular handset. You do not need mechanical aids, such as a handset lifter, for all of this.