38633-11 Plantronics APV-66 EHS Cable for Avaya Replaces the APV-65 (compatible with On-Line Indicator) works with Savi, CS500 Series, CS500 XD Series, MDA200 and Voyager Legend CS. Compatible with Avaya 2420, 4610, 4610SW, 4620, 4620SW, 4621SW, 4622SW, 4625SW, 4630SW, 5420, 5610, 5620, 5621