The Cisco 2851 Integrated Services Router is part of the Cisco 2800 Integrated Services Router Series which complements the Integrated Services Router Portfolio.PRODUCT FEATURES: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);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;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.