The Cisco Spare Narrowband Telephone Handset features an ergonomic design for comfortable use, is Hearing Aid-Compatible (HAC), and meets FCC loudness requirements for the Americans with Disabilities Act (ADA). Compatible with Cisco 7811 and 6800 Series IP Phones, this phone accessory is a cost-efficient way to replace a lost or broken Cisco handset without needing to replace the entire IP phone.