Cisco ISR4331-VSEC/K9 Security Router for Enterprise Networks

What It Is

The Cisco ISR4331-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 is designed for medium-to-large branch offices and enterprise edge deployments, combining routing, security, and voice services in a single chassis. The product is identified by MPN ISR4331-VSEC/K9.

Technical Details

• Chassis model: Cisco ISR 4331, 1RU form factor
• Bundle composition: Includes UC (Unified Communications) and Security (SEC) licenses
• Voice module: PVDM4-32 (Packet Voice DSP Module, 32 channels)
• Platform capabilities: Integrated services routing with modular expansion
• Software features: IP Base (IPB) feature set included
• Hardware interfaces: Modular NIM slots and fixed GE ports (per ISR 4331 base platform)
• Memory/flash: Standard ISR 4331 configuration (8 GB DRAM, 4 GB flash)

Configuration & Options

• The bundle includes the ISR4331-VSEC/K9 model with UC and SEC licenses pre-installed
• PVDM4-32 voice DSP module is part of the standard shipment
• The unit supports additional NIM modules for WAN/LAN interface expansion
• Optional Cisco ONE subscription (model C1-CISCO4331/K9) is available as an alternative ordering path
• The router is field-upgradeable with additional license tiers (e.g., SEC, UC) beyond the bundle

Operating Conditions

This router is intended for deployment in controlled indoor environments such as network closets, server rooms, and branch office communications cabinets. It operates within standard enterprise temperature and humidity ranges for rack-mounted equipment. The ISR4331-VSEC/K9 is suited for 24/7 continuous operation in environments requiring converged voice, data, and security services.