ISR4451-X-VSEC/K9 All-in-One SD-WAN Router with UC and Security
Product Overview
The Cisco ISR4451-X-VSEC/K9 is a fully integrated voice and
security services router, part of the Cisco ISR 4000 Series,
designed for large branch offices requiring unified communications,
advanced security, and high-performance WAN aggregation. This model
includes pre-bundled voice (UC) and security (SEC) licenses,
delivering a powerful, all-in-one SD-WAN-ready platform with
throughput scalable from 1 Gbps to 2 Gbps, supporting features like
IPsec, firewall, SRST, CME, and DSP-enabled voice processing.
Product Details
| Specification | Description |
|---|---|
| Product Code | ISR4451-X-VSEC/K9 |
| Series | Cisco ISR 4000 Series |
| Form Factor | 2RU Rack-Mountable |
| Default Throughput | 1 Gbps (license-upgradable to 2 Gbps) |
| Processor | Multi-core Cisco QuantumFlow Processor |
| System Memory (DRAM) | 4 GB (expandable to 16 GB) |
| Flash Storage | 8 GB (expandable to 32 GB) |
| Integrated LAN/WAN Ports | 4 x 1G RJ45 + 1 x 1G SFP |
| NIM Slots | 3 (Network Interface Modules) |
| SM-X Slots | 2 (Enhanced service modules, e.g., UCS-E, switching) |
| Voice Support | Yes (DSPs, TDM Voice, SRST, CME) |
| Security Features | IPsec VPN, Zone-Based Firewall, Control Plane Protection |
| Software Included | Cisco IOS XE with Voice and Security feature sets |
| Power Supply | Dual redundant PSU support |
| SD-WAN Capable | Yes |
| Virtualization | Supports KVM, UCS-E, and container-based applications |
Product Features
All-in-one solution: Includes licenses for Voice (UC), Security (SEC), and performance boost
Fully integrated VoIP gateway, supporting SRST, CME, FXO/FXS, DSPs
Advanced security: IPsec VPN, firewall, threat protection, zone-based policies
Modular design: Expand with voice cards, LTE modules, or switching/service blades
Powered by Cisco IOS XE, enabling SD-WAN, programmability, and automation
Excellent for high-service branches, converged network designs, or cloud edge
Integrated application visibility and control (AVC) with QoS and performance monitoring
Similar Models Comparison
| Model | Voice License | Security License | Max Throughput | NIM Slots | SD-WAN | Best For |
|---|---|---|---|---|---|---|
| ISR4451-X/K9 | No | No | 2 Gbps | 3 | Yes | General enterprise WAN routing |
| ISR4451-X-V/K9 | Yes | No | 2 Gbps | 3 | Yes | Voice-enabled branch networks |
| ISR4451-X-SEC/K9 | No | Yes | 2 Gbps | 3 | Yes | Secure WAN deployments |
| ISR4451-X-VSEC/K9 | Yes | Yes | 2 Gbps | 3 | Yes | Voice + security convergence |
Latest ISR 4000 Voice & Security Models Comparison
| Model | SD-WAN | Max Throughput | Voice Enabled | Security Enabled | Form Factor | Ideal Use Case |
|---|---|---|---|---|---|---|
| ISR4451-X-VSEC/K9 | Yes | 2 Gbps | Yes | Yes | 2RU | Unified voice and secure branch |
| ISR4431-VSEC/K9 | Yes | 1 Gbps | Yes | Yes | 1RU | Medium secure voice branches |
| ISR4351-VSEC/K9 | Yes | 400 Mbps | Yes | Yes | 1RU | Smaller branch voice deployments |
