The Cisco 6851 is a low-cost, high-fidelity voice communication IP phone designed to improve your organization's person-to-person interactions while lowering operational costs on authorized UCaaS systems.

The Cisco 6851 IP Phone supports an optical key expansion module (KEM) that provides up to 28 additional programmable line/feature keys. KEMS can be used for active voice users such as receptionists, administrative staff, managers, and executives. (KEM will be available in the future). The KEM module adds 14 physical buttons and access to 14 additional buttons via the page buttons, for a total of 28 additional buttons. The KEM supports the programmable Line Key (PLK) function but does NOT support any SIP registrations. Calls may be monitored and answered using the PLK function, calls may NOT be initiated from the KEM.