Cisco ISR4331-VSEC/K9 Integrated Services Router

The Cisco ISR4331-VSEC/K9 Integrated Services Router is a 1U enterprise WAN edge device that combines secure voice-capable routing with integrated security, delivering up to 100 Mbps base throughput (license upgradable) for branch-office networks. It includes 3x Gigabit Ethernet RJ-45 interfaces, 2x Network Interface Module slots, and 1x Service Module slot, and supports PVDM4 DSP modules for VoIP signaling and media processing. Security features include IPSec VPN, firewall, and encryption, while routing supports BGP, OSPF, MPLS, and VPN services, all accessible through Cisco IOS XE with CLI and SNMP management and licensing for UC (Unified Communications) plus Security (SEC). This router is designed for branch offices, retail locations, and distributed enterprises requiring unified communications and secure connectivity, and it is rack-mountable in a 1U chassis with an internal AC power supply. Common replacements for this model include ISR4351-VSEC/K9, ISR4321-VSEC/K9, and ISR4431/K9.