Description Product Reviews Cisco Push to Talk 7900 Series Replacement Handsets All handsets are tested at our factory to ensure that they consistently meet original specifications. Handsets are compatible with all 7900 series Cisco telephones and 3M handsets Hearing Aid Compatible Grey Charcoal Push-to-talk, Center button is depressed to talk release for mute. Add a layer of security to your communications system. Handsets are normally muted to prevent eavesdroipping through handsets. Not compatible with the 7931 Cisco 7912 Cisco 7940 Cisco 7941 Cisco 7960 Cisco 7961 Cisco 7970 Cisco 7971 Cisco 7962 0 Reviews Hide Reviews Product Reviews