The JPL EHS-15 Avaya Adapter Cord electronically connects your DECT headset base to your telephone. It enables remote operation, answer/end calls, for wireless headset use with various phones, eliminating the need for a mechanical handset lifter. For use with Avaya 2420, 4610, 4620, 4621, 4622, 4625, 4630, 5420, 5610, 5620, 5621, 5625, 4610SW, 4620SW, 4621SW, 4622SW, 4625SW and 4630SW, phone models.