Cisco UC500 Phone Systems:

Cisco UC500 series phone systems include the Cisco UC520, Cisco UC540, and Cisco UC560. The Cisco UC500 phone systems feature the same great features Cisco's enterprise phone system, Cisco CallManager, in a single appliance making them the perfect phone system for small and medium businesses. The Cisco UC500 phone systems can support up to 138 users and are modular allowing them to be expanded to support additional ports and lines.