Cisco Unified Communications 500 Series for Small Business, a critical part of the Cisco Smart Business Communications System, is a unified communications solution for small businesses 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 uses business-class, proven unified communications technologies to full advantage and supports flexible deployment models based on your needs - a wide array of IP phones, public switched telephone network (PSTN) interfaces, and Internet connectivity.