The Cisco ISR4351-VSEC/K9 is a high-performance, enterprise-class router from the Cisco 4000 Series Integrated Services Routers (ISR) family, designed for medium to large branch offices, corporate data centers, and enterprise edge networks. Combining advanced routing, security, unified communications, and voice capabilities, this router provides a comprehensive, scalable, and secure networking solution for modern business environments.
Equipped with UC (Unified Communications) and SEC (Security) licenses, the ISR4351-VSEC/K9 supports integrated voice, video, and secure data services. The UC license enables high-quality VoIP and video communication, while the SEC license provides enterprise-grade security features including VPN, firewall, and intrusion prevention. These licenses make the router ideal for organizations that require secure, multi-service connectivity with robust communication capabilities.
The router includes PVDM4-64 modules, offering advanced digital voice processing to support multiple simultaneous voice channels and high-density telephony applications. It also features CUBE-25 (Cisco Unified Border Element), which provides SIP trunking, call routing, and secure session management, making it an ideal solution for enterprise VoIP deployments and branch office communications.
The ISR4351-VSEC/K9 supports flexible WAN and LAN interfaces, providing redundancy, load balancing, and segmented network options. Its enterprise-grade Quality of Service (QoS) ensures that mission-critical applications such as voice, video, and cloud services maintain optimal performance even under high network traffic conditions.
Security is a core strength of this router. Built-in advanced security features—including VPN, firewall, intrusion prevention, and secure network segmentation—protect sensitive business traffic, secure branch-to-branch communications, and help maintain compliance with corporate and industry standards. Cisco’s trusted architecture ensures reliable protection against evolving cyber threats.
Powered by Cisco IOS XE software, the ISR4351-VSEC/K9 offers enterprise-level management, automation, and programmability. Its modular design allows for expansion with additional WAN/LAN or service modules, providing a scalable and future-proof solution for growing enterprises. The combination of high throughput, UC, and security capabilities makes it suitable for complex branch office deployments and corporate networks requiring secure, multi-service operation.
Compact, energy-efficient, and rack-mountable, the ISR4351-VSEC/K9 is ideal for branch offices, corporate sites, and enterprise edge deployments. Its combination of advanced licensing, voice and video capabilities, and secure routing ensures seamless integration into modern enterprise networks.
Whether managing high-performance WAN traffic, deploying secure VPN connections, or supporting unified communications, the Cisco ISR4351-VSEC/K9 delivers a comprehensive, secure, and scalable routing platform that meets the demanding requirements of modern enterprise networks.




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