cisco RouterThe Cisco 2821 Integrated Services Router is part of the Cisco 2800 Integrated Services Router Series which complements the Integrated Services Router Portfolio. The Cisco 2821 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 modularityEnhanced investment protection through increased modularityIncreased density through High-Speed WAN Interface Card Slots (four)Enhanced Network Module SlotSupport for over 90 existing and new modulesSupport for majority of existing AIMs, NMs, WICs, VWICs, and VICsTwo Integrated 10/100/1000 Ethernet portsOptional Layer 2 switching support with Power over Ethernet (PoE) (as an option) On-board encryptionSupport of up to 1500 VPN tunnels with the AIM-EPII-PLUS ModuleAntivirus defense support through Network Admission Control (NAC)Intrusion Prevention as well as stateful Cisco IOS Firewall support and many more essential security features SecurityVoice Analog and digital voice call supportDedicated Extension Voice Module slotOptional voice mail supportOptional support for Cisco CallManager Express (Cisco CME) for local call processing in stand alone business for up to48 IP PhonesOptional support for Survivable Remote Site Telephony support for local call processing in small enterprise branch offices for up to 48 IP phones