The Cisco Unified Communications 540 of the Cisco Unified Communications 500 series for small business, is a critical part of the Cisco smart business communications system. It is an affordable unified communications appliance that provides voice, data, voicemail, automated attendant, video, security, and wireless capabilities while integrating with existing desktop applications such as calendar, email, and customer relationship management (CRM) programs. This reference guide describes the specifications and capabilities of the Cisco Unified Communications 540 (UC 540).