The Plantronics APV-63 EHS Adapter (Avaya) has the following features;

•  Works with Avaya desk phones to eliminate need of HL10 handset lifter
• Allows answer and end call control, making multitasking easy
• Typically used on Avaya phones 
• Compatible with CS500 & W700 series wireless headsets
• Allows for remote answer/hang-up
• Receive call alerts when away from your desk
• Automates taking of calls