Cisco Systems®, Inc. is redefining best-in-class enterprise and small- to- midsize business routing with a new line of integrated services routers that are optimized for the secure, wire-speed delivery of concurrent data, voice, video, and wireless services. Founded on 20 years of leadership and innovation, the Cisco® 2800 Series of integrated services routers intelligently embed data, security, voice, and wireless services into a single, resilient system for fast, scalable delivery of mission-critical business applications. The unique integrated systems architecture of the Cisco 2800 Series delivers maximum business agility and investment protection. The Cisco 2851 Integrated Services Router provides the following support: - Wire-speed performance for concurrent services such as security and voice , and advanced services to multiple T1/E1/xDSL WAN rates - Enhanced investment protection through increased performance and modularity - Enhanced investment protection through increased modularity - Increased density through High-Speed WAN Interface Card Slots (four) - Enhanced Network Module Slot - Support for over 90 existing and new modules - Support for majority of existing AIMs, NMs, WICs, VWICs, and VICs - Two Integrated 10/100/1000 Ethernet ports - Optional Layer 2 switching support with Power over Ethernet (PoE) (as an option) , supports the 36-port Cisco EtherSwitch module (NMD-36ESW) Security : - On-board encryption - Support of up to 1500 VPN tunnels with the AIM-EPII-PLUS Module - Antivirus defense support through Network Admission Control (NAC) - Intrusion Prevention as well as stateful Cisco IOS Firewall support and many more essential security features Voice : - Analog and digital voice call support - Dedicated Extension Voice Module slot - Optional voice mail support - Optional support for Cisco CallManager Express for local call processing in stand alone business for up to 72 IP Phones - Optional support for Survivable Remote Site Telephony support for local call processing in small enterprise branch offices for up to 96 IP phones