The Cisco 1861 Integrated Services Router, which is part of the Cisco 1800 Series Integrated Services Router portfolio, is a unified communications solution for SMBs and enterprise small branch offices that provides voice, data, voicemail, Automated-Attendant, video, and security capabilities while integrating with existing desktop applications such as calendar, e-mail, and customer relationship management (CRM) programs. 

Core components 

• Integrated Cisco Unified Communications Manager Express or Cisco Unified Survivable Remote Site Telephony (SRST) for call processing
• Optional Cisco Unity® Express for voice messaging and Automated Attendant
• Integrated LAN switching with Power over Ethernet (PoE)-expandable through Cisco Catalyst® Switches
• Optional 802.11b/g integrated wireless LAN (WLAN) capability on some models or external access points
• Optional support for range of High-Speed WAN interface cards (HWICs)
• Optional security with firewall, VPN, Secure Sockets Layer (SSL), and intrusion prevention system (IPS) capabilities

Converged IP Communications

The Cisco 1861 Integrated Services Router can meet the IP communications needs of SMB and enterprise small branch offices while concurrently delivering an industry-leading level of security within a single communications system. The Cisco 1861 offers the Cisco Unified Communications Manager Express (CME) integrated as default through Cisco IOS® Software that provides call processing for Cisco IP phones. This solution is targeted at customers interested in deploying a converged IP telephony solution for up to 15 IP phones, and need an integrated WAN for data connectivity. 

As the enterprise extends its IP telephony deployments from central sites to remote offices, one of the critical factors in achieving a successful deployment is the ability to support backup call control at the remote branch office.