Cisco Unified Communications UC520-8U-4FXO for Small Business, a critical part of the Cisco Smart Business Communications System, is an affordable appliance that provides voice, data, voicemail, Automated Attendant, video, security, and wireless capabilities while integrating with existing desktop applications such as calendar, e-mail, and customer relationship management {CRM} programs. This easy-to-manage platform supports up to 50 users and flexible deployment options based on your needs-a wide array of IP phones, public switched telephone network {PSTN} interfaces, and Internet connectivity.