The Cisco 2900 Series routers provide high performance for small to medium enterprises. They offer hardware encryption acceleration, digital signal processing slots, optional firewall and intrusion prevention. Models include the 2901, 2911, 2921 and 2951, with the 2911 providing 3 Ethernet ports, 4 WAN interfaces and support for up to 150 VoIP users. The 2900 Series integrates security, wireless access, unified communications and applications to reduce total cost of ownership.