Cisco ISR4431-VSEC/K9 Integrated Services Router

What It Is

The Cisco ISR4431-VSEC/K9 is an enterprise-class integrated services router from the Cisco ISR 4000 series, delivered as a bundle that includes unified communications (UC) and security (Sec) licenses. This model integrates routing, security, and voice capabilities in a single chassis, suited for medium to large branch offices and campus edge deployments. The product is factory-configured with a PVDM4-64 packet voice digital signal processor module for enhanced voice processing.

Technical Details

• Model: ISR4431-VSEC/K9
• Chassis Type: Cisco ISR 4431 router platform
• Included License: Unified Communications (UC) and Security (Sec) licenses pre-installed
• Voice Processing Module: PVDM4-64 (64-channel packet voice DSP module)
• Form Factor: 2RU rack-mountable integrated services router
• Platform Class: ISR 4000 series modular router

Configuration & Options

• Bundle includes UC and Sec license entitlements for the ISR 4431 platform.
• Ships with one PVDM4-64 module; additional PVDM4 modules may be added per platform capacity.
• The router supports modular network interface modules (NIMs) and service modules for interface expansion.
• Optional software feature licenses (e.g., advanced security or voice) can be activated separately via the Cisco ONE licensing model.

Operating Conditions

This router is designed for deployment in enterprise branch offices, regional headquarters, or colocation facilities requiring integrated voice, security, and data routing. It operates in temperature-controlled indoor environments (standard NEBS/ETSI rack conditions) and is suitable for 24/7 continuous operation in network closets or data centers. The platform supports concurrent voice gateway and secure WAN edge functions within a single device, reducing hardware footprint.