The APP-5 transforms your Polycom Unified IP phone experience through remote answer/end and ring alert. It is compatible with the following Polycom Unified IP Phone models: 320, 330, 430, 450, 550, 560, 650, 670.Compatible with CS70N, CS50, CS55, Voyager 510S, and Supraplus
Plantronics Polycom Electronic Hookswitch Adapter (EHS) (APP-5)
The APP-5 transforms your Polycom Unified IP phone experience through remote answer/end and ring alert. It is compatible with the following Polycom Unified IP Phone models: 320, 330, 430, 450, 550, 560, 650, 670.
Compatible with CS70N, CS50, CS55, Voyager 510S, and Supraplus