The Cisco 2811 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 Fast 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
  • Optional voice mail support
  • Optional support for Cisco CallManager Express (Cisco CME) for local call processing in stand alone business for up to36 IP Phones
  • Optional support for Survivable Remote Site Telephony support for local call processing in small enterprise branch offices for up to 36 IP phones