The Cisco 2821 Integrated Services Router provides the following support:The Cisco 2821 Integrated Services Router is part of the Cisco 2800 Integrated Services Router Series which complements the Integrated Services Router Portfolio.
- 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)
- 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 (Cisco CME) for local call processing in stand alone business for up to48 IP Phones
- Optional support for Survivable Remote Site Telephony support for local call processing in small enterprise branch offices for up to 48 IP phones
