Description Product Reviews All handsets are tested at our factory to ensure that they consistently meet original Avaya specifications. Avaya replacement handset Secure Push-To-Mute handset Push-to-talk handsets insure secure phone lines as the handset is normally muted preventing eaves dropping on handsets not in use. Definity 64XX Series Definity 6400, 6402, 6408D+, 6416D+, 6424, 06, 4612, 4624, Gray Gray Lucent At&T 0 Reviews Hide Reviews Product Reviews